From synth-diy-request at dropmix.xs4all.nl  Sun Apr  1 01:11:36 2007
From: synth-diy-request at dropmix.xs4all.nl (synth-diy-request at dropmix.xs4all.nl)
Date: Sun, 01 Apr 2007 01:11:36 +0200
Subject: Welcome to the "Synth-diy" mailing list
Message-ID: <mailman.120.1175382696.5977.synth-diy@dropmix.xs4all.nl>

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From synth-diy-bounces at dropmix.xs4all.nl  Sun Apr  1 01:30:06 2007
From: synth-diy-bounces at dropmix.xs4all.nl (synth-diy-bounces at dropmix.xs4all.nl)
Date: Sun, 01 Apr 2007 01:30:06 +0200
Subject: The results of your email commands
Message-ID: <mailman.12.1175383806.5475.synth-diy@dropmix.xs4all.nl>

The results of your email command are provided below. Attached is your
original message.

- Results:
    You are already subscribed.

- Unprocessed:
    Am 31.03.2007 um 20:52 schrieb synth-diy-request at dropmix.xs4all.nl:
    > Mailing list subscription confirmation notice for mailing list
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    >
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From Peter.Ullrich at kapsch.net  Sun Apr  1 01:40:43 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Sun, 1 Apr 2007 01:40:43 +0200
Subject: [sdiy] testing 1,2,3
Message-ID: <9CD8492A66A7044FA79781634DD93985010F7852@S060VS01.kapsch.co.at>


The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From jansmail at xs4all.nl  Sun Apr  1 01:52:06 2007
From: jansmail at xs4all.nl (Rick Jansen)
Date: Sun, 01 Apr 2007 01:52:06 +0200
Subject: [sdiy] test
In-Reply-To: <1736965846.20070327232251@alphalink.com.au>
References: <45F9D936.7090506@earthlink.net>	<5.2.1.1.2.20070313172759.03f78710@pop.west.cox.net>	<Pine.GSO.4.60.0703132312450.15397@bigzilla.ece.gatech.edu>	<45F85F80.D35A2181@club-internet.fr>	<45F9CDED.3EEE8F8F@club-internet.fr>	<45F9CEB5.7030108@earthlink.net>	<Pine.GSO.4.64.0703160106260.10839@vipunen.hut.fi>	<45F9D936.7090506@earthlink.net>	<5.1.0.14.2.20070316205721.00ab1230@mail.all-electric.com>	<002201c768de$8cfe4150$1d02a8c0@alger>
	<1736965846.20070327232251@alphalink.com.au>
Message-ID: <460EF426.5040906@xs4all.nl>

Tristan zee op 27/3/07 15:22:

> Is the list working?

Has it ever not been?  ;-)

rick



From Peter.Ullrich at kapsch.net  Sun Apr  1 01:53:34 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Sun, 1 Apr 2007 01:53:34 +0200
Subject: AW: [sdiy] Re: [sdiy-interim] EPROM Armageddon?
References: <20070328091302.0A8928BC416@mailout2.hotkey.net.au>
Message-ID: <9CD8492A66A7044FA79781634DD93985010F7853@S060VS01.kapsch.co.at>

>It's real enough. I got my old '80s eprom burner out about 7 years ago, and
>the OS Rom was totally blank.

Oops! My old digelec 804 is still working (at least checked two months ago)...

Maybe you have also a Digilec 804? 
I could read my chips and send you the binaries.

Ciao
Peter

        \|/
       (o o)
--oOOO--(_)--OOOo------------------------------------------------------

Peter Ullrich I Hardware Engineer, Research & Development
Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net

Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
http://www.kapschtraffic.com/ I http://www.kapsch.net/
Registered at Commercial Court in Vienna FN223805a
Registered Office Vienna

   .oooO          
   (   )   Oooo.   ----------------------------------------------------
    \ (    (   )   Private Homepage: http://home.pages.at/pullrich
-----\_)----) /--------------------------------------------------------
           (_/


The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From sasami at hotkey.net.au  Sun Apr  1 02:10:02 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Sun,  1 Apr 2007 10:10:02 +1000 (EST)
Subject: AW: [sdiy] Re: [sdiy-interim] EPROM Armageddon?
Message-ID: <20070401001002.7B1F68BC2CE@mailout2.hotkey.net.au>

It was the Z80 based Microprofessor and accessories.

Ken
 
>>It's real enough. I got my old '80s eprom burner out about 7 years ago, and
>>the OS Rom was totally blank.
>
>Oops! My old digelec 804 is still working (at least checked two months ago)...
>
>Maybe you have also a Digilec 804? 
>I could read my chips and send you the binaries.
>
>Ciao
>Peter
>
>        \|/
>       (o o)
>--oOOO--(_)--OOOo------------------------------------------------------
>
>Peter Ullrich I Hardware Engineer, Research & Development
>Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
>eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net
>
>Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
>http://www.kapschtraffic.com/ I http://www.kapsch.net/
>Registered at Commercial Court in Vienna FN223805a
>Registered Office Vienna
>
>   .oooO          
>   (   )   Oooo.   ----------------------------------------------------
>    \ (    (   )   Private Homepage: http://home.pages.at/pullrich
>-----\_)----) /--------------------------------------------------------
>           (_/
>
>
>The information contained in this e-mail message is privileged and
>confidential and is for the exclusive use of the addressee. The person
>who receives this message and who is not the addressee, one of his
>employees or an agent entitled to hand it over to the addressee, is
>informed that he may not use, disclose or reproduce the contents thereof.
>
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From dustin.sedlacek at gmail.com  Sun Apr  1 02:30:05 2007
From: dustin.sedlacek at gmail.com (dustin sedlacek)
Date: Sat, 31 Mar 2007 18:30:05 -0600
Subject: [sdiy] yay!
Message-ID: <b50a5d0a0703311730h7e04ee22gb8a990ae19d491ae@mail.gmail.com>

title says it all

-- 
Dustin
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From cfmd at bredband.net  Sun Apr  1 03:13:54 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Sun, 01 Apr 2007 03:13:54 +0200 (CEST)
Subject: [sdiy] Hello world!
In-Reply-To: <460EA706.3040005@xs4all.nl>
References: <460EA706.3040005@xs4all.nl>
Message-ID: <20070401.031354.1689663530.cfmd@bredband.net>

From: Rick Jansen <rick.jansen at xs4all.nl>
Subject: [sdiy] Hello world!
Date: Sat, 31 Mar 2007 20:23:02 +0200
Message-ID: <460EA706.3040005 at xs4all.nl>

Hi Rick,

> What a nice new list.

Indeed. You haven't been this active on Synth-DIY for ages. :)

Do you intend to import the archives?

Cheers,
Magnus


From ijfritz at comcast.net  Sun Apr  1 04:34:52 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Sat, 31 Mar 2007 20:34:52 -0600
Subject: [sdiy] Hello world!
In-Reply-To: <460EA706.3040005@xs4all.nl>
References: <460EA706.3040005@xs4all.nl>
Message-ID: <6.2.1.2.2.20070331203407.020b9ea8@mail.comcast.net>

At 12:23 PM 3/31/2007, Rick Jansen wrote:

>What a nice new list.

Are the old posts that didn't get through recoverable? 



From mailman-owner at dropmix.xs4all.nl  Sun Apr  1 05:03:03 2007
From: mailman-owner at dropmix.xs4all.nl (mailman-owner at dropmix.xs4all.nl)
Date: Sun, 01 Apr 2007 05:03:03 +0200
Subject: dropmix.xs4all.nl mailing list memberships reminder
Message-ID: <mailman.507.1175396583.7747.mailman@dropmix.xs4all.nl>

This is a reminder, sent out once a month, about your
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From marxspeakstruth at gmail.com  Sun Apr  1 05:22:45 2007
From: marxspeakstruth at gmail.com (Spencer Johnson)
Date: Sat, 31 Mar 2007 22:22:45 -0500
Subject: [sdiy] Drone Oscillators
Message-ID: <89278f010703312022s7256a88bl7505848bc27eac23@mail.gmail.com>

Hey, just reposting this for the new list!

I'm building a keyboard based on a Mostek Top Octave divider, and
before the mixer and effects chain i'd like to have some drone
oscillators for harmony, but i don't know what type of circuit i
should use. i'd like to have simultaneous square, sine, and triangle
waves, preferable all independently tunable with coarse and fine
tuning. i've got some designs for a few function generators but i
don't think that the tuning is linear, and that the high ranges would
all be jammed together. should i use a linear vco? any input would be
much appreciated!

-spencer


From cary.roberts at retrosynth.net  Sun Apr  1 08:16:04 2007
From: cary.roberts at retrosynth.net (Cary Roberts)
Date: Sat, 31 Mar 2007 23:16:04 -0700
Subject: [sdiy] Ignore - test email for the archives
Message-ID: <000001c77425$3a827a70$6601fd0a@camilla>

I said ignore, but since you didn't, you can check out some module porn
of my Don Martin Moog modules here:

	http://www.moogmodular.com/


-Cary



From nixotic1 at blueyonder.co.uk  Sun Apr  1 09:42:49 2007
From: nixotic1 at blueyonder.co.uk (Quixotic Nixotic)
Date: Sun, 1 Apr 2007 08:42:49 +0100
Subject: [sdiy] Don Martin and the first musical instrument
In-Reply-To: <000001c77425$3a827a70$6601fd0a@camilla>
References: <000001c77425$3a827a70$6601fd0a@camilla>
Message-ID: <08EB9E5D-4244-47F7-A3C5-1B16117DEED4@blueyonder.co.uk>

On 1 Apr 2007, at 07:16, Cary Roberts wrote:

> I said ignore, but since you didn't, you can check out some module  
> porn
> of my Don Martin Moog modules here:
>
> 	http://www.moogmodular.com/

Yeah, Don Martin's explanation of the very first musical instrument  
is also excellent.
http://www.nachshon.org.il/~itzs/Don%20Martin/html/cave1a.htm

John



From matthias.herrmann at fonik.de  Sun Apr  1 12:04:58 2007
From: matthias.herrmann at fonik.de (Matthias Herrmann)
Date: Sun, 1 Apr 2007 12:04:58 +0200
Subject: [sdiy] doubledouble
In-Reply-To: <460ECB4D.3020502@xs4all.nl>
Message-ID: <LNEMJLLDOIOKMLNOFFNDCELCCGAA.matthias.herrmann@fonik.de>

now i get all mails twice!
i think i did a excellent job re-subscribing to the list?

cheers,
matthias


From Peter.Ullrich at kapsch.net  Sun Apr  1 15:28:35 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Sun, 1 Apr 2007 15:28:35 +0200
Subject: AW: AW: [sdiy] Re: [sdiy-interim] EPROM Armageddon?
References: <20070401001002.7B1F68BC2CE@mailout2.hotkey.net.au>
Message-ID: <9CD8492A66A7044FA79781634DD93985010F7854@S060VS01.kapsch.co.at>

Hi Ken!

>>Maybe you have also a Digilec 804? 
>>I could read my chips and send you the binaries.

>It was the Z80 based Microprofessor and accessories.

I see. As far as I remember this was the Z80 evaluation board with a 
little keyboard and display on it - right?
http://www.pasta.franken.de/mpf1map.htm

Here is the problem that the eprom is quite exposed to light - so if
there was only a paper sticker on it and not a metallic sticker the
contents of the eprom were very unsafe.

As I have no microprofessor board (but I used one in school) I can't 
help you direct but indirectly.

There are a lot of fanpages on the internet for this board.

And this page http://members.lycos.co.uk/leeedavison/z80/mpf1/index.html 
has the eprom binary in a zipfile:
http://members.lycos.co.uk/leeedavison/z80/mpf1/mpf1.zip

So if you still have the board you can bring it to life by programming
an eprom! But be sure to put a metallic sticker on the eprom window!

Ciao
Peter
        \|/
       (o o)
--oOOO--(_)--OOOo------------------------------------------------------

Peter Ullrich I Hardware Engineer, Research & Development
Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net

Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
http://www.kapschtraffic.com/ I http://www.kapsch.net/
Registered at Commercial Court in Vienna FN223805a
Registered Office Vienna

   .oooO          
   (   )   Oooo.   ----------------------------------------------------
    \ (    (   )   Private Homepage: http://home.pages.at/pullrich
-----\_)----) /--------------------------------------------------------
           (_/


The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From logo64 at gmail.com  Sun Apr  1 16:46:32 2007
From: logo64 at gmail.com (Gerald Stevens)
Date: Sun, 1 Apr 2007 06:46:32 -0800
Subject: [sdiy] Re: [sdiy-interim] first commercial video module?
In-Reply-To: <4608E3CD.9090306@gte.net>
References: <s608f4eb.059@rhcl03n02.sr.se> <4608E3CD.9090306@gte.net>
Message-ID: <1dc7c5a0704010746j1e0dc637lf13ef979fa5626dd@mail.gmail.com>

Naw...

It just requires more specificity.

MFB VD-01 - World's first _affordable_ video scope!

-g

On 3/27/07, Cynthia Webster <cynthia.webster at gte.net> wrote:
>
>
> Creating modern day analog or digital video synthesis modules is quite a
> tall order technically,
> and I feel that we have to be very careful about throwing claims about
> the "first" this, or the
> "first" that, without careful examination.
>
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From mikebeauchamp at gmail.com  Sun Apr  1 20:02:13 2007
From: mikebeauchamp at gmail.com (Mike Beauchamp)
Date: Sun, 1 Apr 2007 14:02:13 -0400
Subject: [sdiy] Nice Noise Source
In-Reply-To: <C205B3CB.9B2F%sdiy@oveloe.com>
References: <45DFC656.8070801@sonic.net> <C205B3CB.9B2F%sdiy@oveloe.com>
Message-ID: <6110e6230704011102p39ed88dcjcfacf7e441f9b45@mail.gmail.com>

Hey Charles, it looks like Moog beat you to it (at least for today):

http://www.moogmusic.com/detail.php?main_product_id=21066

MF-FM: NEW MOOGERFOOGER EFFECT USES BROADCAST RADIO SIGNALS

The MF/FM has an on-board analog radio tuner, capable of locking into
frequencies across the FM radio band. Mix any instrument with live
radio signals, and tweak the voltage controlled oscillator for
modulated madness and creativity

Its available April First.. nice :)

Mike



On 2/24/07, Charles Bisaillon <sdiy at oveloe.com> wrote:
>
> >>
> >> Can you build it with a CV input for the tuning frequency?
> >>
> >> Then you'd be able to sweep through the stations under CV control. Or
> >> set your sequencer up to play Stockhausen, I suppose...
>
> > Don Buchla demonstrated a CV control FM radio to David Tudor and John
> > Cage in the early 60's:
> >
> > "Cage and Tudor visited me at my studio in Berkeley. ...My studio at
> > that time was ten feet wide and I worked out on the sidewalk.  It was so
> > crowded in there we hauled the workbench out on the sidewalk on good
> > days and set up my oscilloscope and worked out there.  Cage came by and
> > for voltage control I had hooked up my keyboard to an FM module that I'd
> > built, a little module that was an FM receiver and I could play stations
> > on it because I had one of the first varactor tuned FMs.  Cage, as you
> > can imagine was, just enormously interested in the fact that I could
> > tune each key to a station and then proceeded to play the radio."
> >
> > This is from the Vasulka Archive.
> >
> > -Dave
> >
>
>
> All of your ideas are great! I finally got the radio to work yesterday by
> rolling up a piece of wire on a pen. It really is amazing how this stuff
> works, I can change stations by turning the knob or by playing with my coil.
> The piece of rolled up wire is so sensitive to capacitance to other circuit
> elements that I can sweep through a dozen stations just by moving the coil
> slightly. It seems like the more turns the coil have, the wider the FM band
> I can receive. From what I've heard with the last coil I've used, I assume I
> can go from 90Mhz up to 130Mhz or something similar. To describe it in 1
> words: AMAZING.
>
> CV input is going to be a joke, I don't even think I'll need an op amp. The
> radio tuning is already voltage controlled with a 10V - 0V range. I just add
> another in parallel. I really like the idea of having a different station
> for every key!
>
> I'll post the schematic very soon.
>
> Cheers
>
> Charles
>
>


-- 
Mike Beauchamp
Cross Canada Project: http://mikebeauchamp.com/crosscanada
Personal: http://mikebeauchamp.com
Business: http://therevox.com
Windsor News: http://windsorinb.relyon.ca


From sounddoctorin at imt.net  Mon Apr  2 07:42:09 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Sun, 01 Apr 2007 22:42:09 -0700
Subject: [sdiy] arp submodule question ..5400601F ?
Message-ID: <461097B1.7060904@imt.net>

I get no hits related on that number.  That's the only one on these 
boards.  I had thought they were 4034 or 5's.  On closer examination 
though....

1) I have a 4034 here.  It's absolutely NOT the same.  The design of the 
board is totally different.  Op amp on opposite end etc.  The rev. A I 
have has discrete FET's.  These have a dual FET in a can.  But ALSO the 
schematic deviates.  There is no 1K resistor attached to one of the 
input sides but there is on the other. (Pin 12 on the Z2 3086).  So I 
just wondered before I probe my life away if anyone has a clue what 
these things are from.  I got half a dozen or so in Tim Smith's stuff.  
The first one oscillates at some high requency.  Wasn't the output op amp. 

But anyway..these are obviously later models because there is no sign 
they were potted ever.  The 4072 and 75 use the LM3900 with transistor 
pairs.  Rather than 4 3086's.  So I'm not finding a match in any of the 
diagrams I can find on the arp submodules page exactly. -Bob


From xyzzy at sysabend.org  Mon Apr  2 08:32:10 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Sun, 1 Apr 2007 23:32:10 -0700
Subject: [sdiy] Altrium Designer/Protel
Message-ID: <20070402063210.GB47569@moo.sysabend.org>

I know at least a few people on here have used Protel, has anyone used
Altium Designer?  It looks like Altium has killed off Protel and only Altium
Designer is available now, but I cant find many comparisons between them.

I've been reading some bad things about later versions of Protel anyway so
maybe Altium isnt a path I even want to consider, but Protel seems to have
an exceedingly strong following so I want to look into it.

Downloading Proteus right now to give it a spin around the block...  This
will make the 9th or 10th package I've looked at today and sofar all have
failed my rather simple tests.  ( personal preference tests, nothing
"broken" about most of them... ).

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From c0r3dump23 at yahoo.com  Mon Apr  2 08:40:11 2007
From: c0r3dump23 at yahoo.com (Metrophage)
Date: Sun, 1 Apr 2007 23:40:11 -0700 (PDT)
Subject: [sdiy] We are back
Message-ID: <41053.28991.qm@web63001.mail.re1.yahoo.com>

Hi everybody!

I've been off the list for quite some time. It was alarming that when I
tried re-joining the list was gone. I'm happy everything is running
again!

CJ


 
____________________________________________________________________________________
Sucker-punch spam with award-winning protection. 
Try the free Yahoo! Mail Beta.
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From abisset at dspaudio.com  Mon Apr  2 09:06:29 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Mon, 2 Apr 2007 00:06:29 -0700 (PDT)
Subject: [sdiy] miniature illuminated push buttons switches 
In-Reply-To: <41053.28991.qm@web63001.mail.re1.yahoo.com>
References: <41053.28991.qm@web63001.mail.re1.yahoo.com>
Message-ID: <Pine.LNX.4.58.0704012359030.19010@fourier>

on the off chance this will be useful to someone, i spent maybe 12 hours
sourcing illuminated switches and found a small profile switch that can be
useful for retrofitting serge.

following Steve's good advice to check into idec 8mm a18 Peanut Butter and
jelly's i found them to be too deep (1.3 inches and serge through pcb
pots only give us 1 inch between panel and board).  if anyone is in need
of an 8mm through panel mounting illuminated "maintained" (latching) push
button, EOS makes one that requires only .903 inches as opposed to the
IDEC a18's 1.3 inches.

allen and bradly might have something, but rockwell automations host of
websites and subsidiaries (dairies? for milking consumers) is tangled and
impossible to navigate.


-a



From eric at piramiden.demon.nl  Mon Apr  2 09:40:56 2007
From: eric at piramiden.demon.nl (Eric van Baaren)
Date: Mon, 2 Apr 2007 09:40:56 +0200
Subject: [sdiy] arp submodule question ..5400601F ?
In-Reply-To: <461097B1.7060904@imt.net>
Message-ID: <NHBBIFCEGLMEBDNBDAJHEEAEGAAA.eric@piramiden.demon.nl>

Hi Bob

I have  two different 4034 and a 4035 in front of me and the differences are
like you described except for the 1k resistor which isn't there.


4035-004REV1 never potted - dual fet 2n3958 - tantalums on powerinput
4034-003 REV-A  potted -two fets 2n5459 on the opposite side - metalcan
lm301AH on the opposite side - tempco on opposite side - ceramic caps on
powerinput
the other 4034-003 REV-A   potted - 2n3958 - lm301AN opposite side - the
rest looks the same

Best,

Eric van Baaren.
_________________
http://www.sainteric.eu




-----Oorspronkelijk bericht-----
Van: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]Namens Bob Weigel
Verzonden: maandag 2 april 2007 7:42
Aan: synthdiy
Onderwerp: [sdiy] arp submodule question ..5400601F ?


I get no hits related on that number.  That's the only one on these
boards.  I had thought they were 4034 or 5's.  On closer examination
though....

1) I have a 4034 here.  It's absolutely NOT the same.  The design of the
board is totally different.  Op amp on opposite end etc.  The rev. A I
have has discrete FET's.  These have a dual FET in a can.  But ALSO the
schematic deviates.  There is no 1K resistor attached to one of the
input sides but there is on the other. (Pin 12 on the Z2 3086).  So I
just wondered before I probe my life away if anyone has a clue what
these things are from.  I got half a dozen or so in Tim Smith's stuff.
The first one oscillates at some high requency.  Wasn't the output op amp.

But anyway..these are obviously later models because there is no sign
they were potted ever.  The 4072 and 75 use the LM3900 with transistor
pairs.  Rather than 4 3086's.  So I'm not finding a match in any of the
diagrams I can find on the arp submodules page exactly. -Bob
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From abisset at dspaudio.com  Mon Apr  2 10:17:49 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Mon, 2 Apr 2007 01:17:49 -0700 (PDT)
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
 uncles and graverobbers
In-Reply-To: <6.2.1.2.2.20070331203407.020b9ea8@mail.comcast.net>
References: <460EA706.3040005@xs4all.nl>
	<6.2.1.2.2.20070331203407.020b9ea8@mail.comcast.net>
Message-ID: <Pine.LNX.4.58.0704020006560.19010@fourier>

the serge retrofit is getting to the stage where i need to consider
power supplies.  i'm traveling a lot, so i'm wondering how viable
it would be to build a reasonably lightweight filtering circuit so that i
could use standard crappy pc atx power supplies?  Anybody attempted this?
On this note, i can't find a single atx supply with more than 0.8amp on
the -12v rail... anybody know of a balanced atx supply?

Anyway,
at the moment i'm using a power-one hdcc and it's great, however it
weighs almost 30 pounds.  And the fact that i need a second supply for
another bit of kit brings us to almost 40 pounds of electricity.

I could purchase 3 of these and leave them on three different landmasses
but even lugging them around is a hassle and there's the chance i'll be in
other cities and again confronted with finding a power supply.

I need at least 3.4amp's on the +/-12v rails..  Since there is some jcd
involved, it'd be ideal to have a small .5amp tap at +/- 15v with 3.2a or
so on +/-12v and whatever on 5.

-anthony


From sasami at hotkey.net.au  Mon Apr  2 10:39:21 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Mon,  2 Apr 2007 18:39:21 +1000 (EST)
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
	uncles and graverobbers
Message-ID: <20070402083921.DA9488BC3D6@mailout2.hotkey.net.au>


>On this note, i can't find a single atx supply with more than 0.8amp on
>the -12v rail... anybody know of a balanced atx supply?

That's because it is only used for the RS232 port. You'd need to use two of
them, one for each rail, and then you'd discover the next quirk - they
usually require a 5V load to even start.

Consider using three or four smaller linear units instead of one big one.
That will also help you if you have a failure on the road.

Ken
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From patchell at cox.net  Mon Apr  2 15:07:17 2007
From: patchell at cox.net (Jim Patchell)
Date: Mon, 02 Apr 2007 06:07:17 -0700
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <20070402063210.GB47569@moo.sysabend.org>
References: <20070402063210.GB47569@moo.sysabend.org>
Message-ID: <46110005.7070901@cox.net>

Tom Arnold wrote:
> I know at least a few people on here have used Protel, has anyone used
> Altium Designer?  It looks like Altium has killed off Protel and only Altium
> Designer is available now, but I cant find many comparisons between them.
>
> I've been reading some bad things about later versions of Protel anyway so
> maybe Altium isnt a path I even want to consider, but Protel seems to have
> an exceedingly strong following so I want to look into it.
>
> Downloading Proteus right now to give it a spin around the block...  This
> will make the 9th or 10th package I've looked at today and sofar all have
> failed my rather simple tests.  ( personal preference tests, nothing
> "broken" about most of them... ).
>
>   
I would try and find something different.  I use DXP at work...I 
personally feel it is an overpriced POS.  I have been a protel user 
since it first came out.  The original program was easy to use and very 
lean.  It is now very obtuse, and a big fat bloated pig.  DXP is 
protel.  And starting with Protel version 3.0, bugs seem to have started 
working their way back into the software.

I so far, have not found anything I feel is a good value for home use.  
I am currently using Protel PCB version 2.7 (an old windows 3.1 version) 
and Orcad Version 9.2 for schematic capture.

Oh yeah...I have heard bad things about new versions of ORCAD as well.

-Jim




From harrybissell at copper.net  Mon Apr  2 15:32:29 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Mon, 2 Apr 2007 13:32:29 -0000
Subject: [sdiy] We are back
Message-ID: <380-22007412133229755@copper.net>

Welcome bacl CJ !

H^) harry

---- Original Message ----
From: c0r3dump23 at yahoo.com
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] We are back
Date: Sun, 1 Apr 2007 23:40:11 -0700 (PDT)

>Hi everybody!
>
>I've been off the list for quite some time. It was alarming that when
>I
>tried re-joining the list was gone. I'm happy everything is running
>again!
>
>CJ
>
>
> 
>_____________________________________________________________________
>_______________
>Sucker-punch spam with award-winning protection. 
>Try the free Yahoo! Mail Beta.
>http://advision.webevents.yahoo.com/mailbeta/features_spam.html
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From sdiy at oveloe.com  Mon Apr  2 16:23:14 2007
From: sdiy at oveloe.com (Charles Bisaillon)
Date: Mon, 02 Apr 2007 10:23:14 -0400
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <20070402063210.GB47569@moo.sysabend.org>
Message-ID: <C2368A12.A0AC%sdiy@oveloe.com>

Le 4/2/07 2:32 AM, ??Tom Arnold?? <xyzzy at sysabend.org> a ?crit?:

> I know at least a few people on here have used Protel, has anyone used
> Altium Designer?  It looks like Altium has killed off Protel and only Altium
> Designer is available now, but I cant find many comparisons between them.
> 
> I've been reading some bad things about later versions of Protel anyway so
> maybe Altium isnt a path I even want to consider, but Protel seems to have
> an exceedingly strong following so I want to look into it.
> 
> Downloading Proteus right now to give it a spin around the block...  This
> will make the 9th or 10th package I've looked at today and sofar all have
> failed my rather simple tests.  ( personal preference tests, nothing
> "broken" about most of them... ).

Altium is what we used to get our capstone PCBs printed in China. I haven't
used them personnaly but my teammates started off with Protel 99 and hated
it. When they switched to Altium, they said it was much easier to use and to
understand, they completed the PCBs with this one.

In the end, we have nothing to complain about except that a trace is missing
in the VCF. We are still unsure whether this was connected or not in the
schematic although everything seemed fine.

We also had a hard time to generate the Gerber file.

Cheers

Charles




From controlvoltage at gmail.com  Mon Apr  2 16:36:32 2007
From: controlvoltage at gmail.com (Amos)
Date: Mon, 2 Apr 2007 10:36:32 -0400
Subject: [sdiy] We are back
In-Reply-To: <41053.28991.qm@web63001.mail.re1.yahoo.com>
References: <41053.28991.qm@web63001.mail.re1.yahoo.com>
Message-ID: <908a4c120704020736y189d84e5xdffcc9035e5523a9@mail.gmail.com>

There
Are
Many
Imitators
But
We
Are
The
Truuuue
Cre-8-0rs
We're Back!

(LFO <Mark Bell>; "We're Back" 1991)

Welcome back!

-Amos



On 4/2/07, Metrophage <c0r3dump23 at yahoo.com> wrote:
> Hi everybody!
>
> I've been off the list for quite some time. It was alarming that when I
> tried re-joining the list was gone. I'm happy everything is running
> again!
>
> CJ
>
>
>
> ____________________________________________________________________________________
> Sucker-punch spam with award-winning protection.
> Try the free Yahoo! Mail Beta.
> http://advision.webevents.yahoo.com/mailbeta/features_spam.html
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From elektrodwarf at yahoo.se  Mon Apr  2 17:04:13 2007
From: elektrodwarf at yahoo.se (Karl Ekdahl)
Date: Mon, 2 Apr 2007 17:04:13 +0200 (CEST)
Subject: [sdiy] ot: finger pressure sensor
Message-ID: <20070402150414.52608.qmail@web26208.mail.ukl.yahoo.com>

Hi list, off topic but i need to build a device that
measures the pressure inbetween the thumb and the
index finger. The thing has to be incredibly small to
exhibit as little interference with the fingers as
possible. I was thinking of capacitive pills that has
been discussed, but i have never used that so i have
no idea if it's a good idea or not. Any ideas greatly
appreciated!

Karl


	
	
		
_________________________________________________________
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From rick.jansen at xs4all.nl  Mon Apr  2 17:33:45 2007
From: rick.jansen at xs4all.nl (Rick Jansen)
Date: Mon, 02 Apr 2007 17:33:45 +0200
Subject: [sdiy] List home page, and links to your home pages
Message-ID: <46112259.8020902@xs4all.nl>

As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
some rather ancient and dusty links.

Let me know if you want a link [added/removed/changed] there to your own
home page, or the page with your synth-diy things.
-- 
Rick Jansen


From ebrombaugh at earthlink.net  Mon Apr  2 17:40:24 2007
From: ebrombaugh at earthlink.net (Eric Brombaugh)
Date: Mon, 02 Apr 2007 08:40:24 -0700
Subject: [sdiy] ot: finger pressure sensor
In-Reply-To: <20070402150414.52608.qmail@web26208.mail.ukl.yahoo.com>
References: <20070402150414.52608.qmail@web26208.mail.ukl.yahoo.com>
Message-ID: <461123E8.5030005@earthlink.net>

Karl Ekdahl wrote:
> Hi list, off topic but i need to build a device that
> measures the pressure inbetween the thumb and the
> index finger. The thing has to be incredibly small to
> exhibit as little interference with the fingers as
> possible.

I've done home-made pressure sensors using the black conductive foam 
that's often used to protect DIP ICs from ESD. Just cut out a small 
section and sandwich it between sheets of foil. Varying pressure => 
varying resistance between the foil contacts. You should be able to make 
it as small as you want.

Calibration may be a problem though - kinda hard to control the range.

Eric


From wonggster at gmail.com  Mon Apr  2 17:45:57 2007
From: wonggster at gmail.com (gino wong)
Date: Mon, 2 Apr 2007 11:45:57 -0400
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
	uncles and graverobbers
In-Reply-To: <20070402083921.DA9488BC3D6@mailout2.hotkey.net.au>
References: <20070402083921.DA9488BC3D6@mailout2.hotkey.net.au>
Message-ID: <18ef0b50704020845y61d2c020i3e747e3465310be7@mail.gmail.com>

I too have been looking for a pcb for a 317-337 adjustable linear
supply with a small footprint.  I can't find a reputable dealer that
will just sell a board.  You would think something like that would be
very common

On 4/2/07, Ken Stone <sasami at hotkey.net.au> wrote:
>
> >On this note, i can't find a single atx supply with more than 0.8amp on
> >the -12v rail... anybody know of a balanced atx supply?
>
> That's because it is only used for the RS232 port. You'd need to use two of
> them, one for each rail, and then you'd discover the next quirk - they
> usually require a 5V load to even start.
>
> Consider using three or four smaller linear units instead of one big one.
> That will also help you if you have a failure on the road.
>
> Ken
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From j.l.marshall at comcast.net  Mon Apr  2 17:53:11 2007
From: j.l.marshall at comcast.net (John L Marshall)
Date: Mon, 2 Apr 2007 08:53:11 -0700
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <001201c7753f$0464e8e0$6701a8c0@cheetah>

Rick,

I coordinate the annual Pacific Northwest Synthesizer Meeting. There is also 
limited information on my homemade synthesizer at www.sound-photo.com Oh 
yes, and a pretty good list of links.

Take care,
John
www.sound-photo.com
www.antenna-farm.com

----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 02, 2007 8:33 AM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
>
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From cfmd at bredband.net  Mon Apr  2 18:07:24 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Mon, 02 Apr 2007 18:07:24 +0200 (CEST)
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <20070402.180724.-1534666524.cfmd@bredband.net>

From: Rick Jansen <rick.jansen at xs4all.nl>
Subject: [sdiy] List home page, and links to your home pages
Date: Mon, 02 Apr 2007 17:33:45 +0200
Message-ID: <46112259.8020902 at xs4all.nl>

Rick,

> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.

Me (Magnus Danielson) linked as http://rubidium.dyndns.org/~magnus/

Anders Sponton linked as http://rubidium.dyndns.org/cag/

(Yes, Anders site now lives on my machine, happy to host him).

Cheers,
Magnus


From mrmike at clickbang.com  Mon Apr  2 18:11:04 2007
From: mrmike at clickbang.com (mrmike)
Date: Mon, 02 Apr 2007 11:11:04 -0500
Subject: [sdiy] Capacitor substitution
Message-ID: <46112B18.2030501@clickbang.com>

Having failed in my search for small value (<100pF) polystyrene caps, I 
was looking at a quality substitution. I can't find any polycarbonate 
either. Or polypropylene.

 Would a good mica (rated at +/- 1pF tolerance) be a good substitute?

mrmike


From music.maker at gte.net  Mon Apr  2 18:16:47 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Mon, 02 Apr 2007 09:16:47 -0700
Subject: [sdiy] List home page, and links to your home pages
Message-ID: <200704021616.l32GGl56018985@linux7.lan>

synthesizer diy electronics <synth-diy at dropmix.xs4all.nl> wrote:

You can add my FatMan page (Scott Gravenhorst):

http://home1.gte.net/res0658s/fatman/


>> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>> some rather ancient and dusty links.
>>
>> Let me know if you want a link [added/removed/changed] there to your own
>> home page, or the page with your synth-diy things.
>> -- 
>> Rick Jansen
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From synth1 at airmail.net  Mon Apr  2 18:22:03 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Mon, 2 Apr 2007 11:22:03 -0500
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <00e101c77543$0df2c0e0$7800a8c0@bilbo>

Please add me:

Paul Schreiber www.synthtech.com

Paul S.

----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 02, 2007 10:33 AM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From dalenkarl at yahoo.se  Mon Apr  2 18:22:22 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 2 Apr 2007 18:22:22 +0200 (CEST)
Subject: SV: [sdiy] Altrium Designer/Protel
In-Reply-To: <20070402063210.GB47569@moo.sysabend.org>
Message-ID: <105586.3013.qm@web27607.mail.ukl.yahoo.com>

As far as i know its just names of programs, still the same old
Autotrax! :-)

I heard that Altium is gong to rename it back to Protel!!!

Well, when things comes to Protel the last stable version was Protel99SE,
the following Altium releases was anything from plaan disasters to
very expencive disasters, however that has been fairly sorted out
as they say?!

Altium is a mess of various tools from other wendors that Altium has bought.

Altium/Protel was/is famous for its non working autoroters! :-)

Im shure there is plenty of better/cheaper alternatives today!

As i previously said buying EDA tools are like buying a car! 

KD


--- Tom Arnold <xyzzy at sysabend.org> skrev:

> I know at least a few people on here have used Protel, has anyone used
> Altium Designer?  It looks like Altium has killed off Protel and only Altium
> Designer is available now, but I cant find many comparisons between them.
> 
> I've been reading some bad things about later versions of Protel anyway so
> maybe Altium isnt a path I even want to consider, but Protel seems to have
> an exceedingly strong following so I want to look into it.
> 
> Downloading Proteus right now to give it a spin around the block...  This
> will make the 9th or 10th package I've looked at today and sofar all have
> failed my rather simple tests.  ( personal preference tests, nothing
> "broken" about most of them... ).
> 
> -- 
>  -----------------------------------------------------------------
>  - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
>  - SynthGeek        -
>  - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
>  - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
>  --------------------  
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From dalenkarl at yahoo.se  Mon Apr  2 18:33:33 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 2 Apr 2007 18:33:33 +0200 (CEST)
Subject: SV: Re: [sdiy] Altrium Designer/Protel
In-Reply-To: <46110005.7070901@cox.net>
Message-ID: <137318.84579.qm@web27606.mail.ukl.yahoo.com>


--- Jim Patchell <patchell at cox.net> skrev:

> Tom Arnold wrote:
> > I know at least a few people on here have used Protel, has anyone used
> > Altium Designer?  It looks like Altium has killed off Protel and only
> Altium
> > Designer is available now, but I cant find many comparisons between them.
> >
> > I've been reading some bad things about later versions of Protel anyway so
> > maybe Altium isnt a path I even want to consider, but Protel seems to have
> > an exceedingly strong following so I want to look into it.
> >
> > Downloading Proteus right now to give it a spin around the block...  This
> > will make the 9th or 10th package I've looked at today and sofar all have
> > failed my rather simple tests.  ( personal preference tests, nothing
> > "broken" about most of them... ).
> >
> >   
> I would try and find something different.  I use DXP at work...I 
> personally feel it is an overpriced POS.  I have been a protel user 
> since it first came out.  The original program was easy to use and very 
> lean.  It is now very obtuse, and a big fat bloated pig.  DXP is 
> protel.  And starting with Protel version 3.0, bugs seem to have started 
> working their way back into the software.

Yes 2.8 was very stable even the router worked, however it stopped
working with later version! :-)
 
> I so far, have not found anything I feel is a good value for home use.  
> I am currently using Protel PCB version 2.7 (an old windows 3.1 version) 
> and Orcad Version 9.2 for schematic capture.

The shift from the 2,8- 3.0 to 98,99 and SE versions was major, 
i had to releran the program operatings from scratch,the older 
versions was way easier to deal with.

Pricing of Altium DXP are plain obstructive, one almost feel offended!
 
> Oh yeah...I have heard bad things about new versions of ORCAD as well.

:-)

KD 


> -Jim
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From moogah at gmail.com  Mon Apr  2 18:34:51 2007
From: moogah at gmail.com (Jeff Farr)
Date: Mon, 2 Apr 2007 12:34:51 -0400
Subject: [sdiy] Capacitor substitution
In-Reply-To: <46112B18.2030501@clickbang.com>
References: <46112B18.2030501@clickbang.com>
Message-ID: <78f89520704020934o60faa7e1ta42ec786ac45163b@mail.gmail.com>

http://www.surplussales.com/Capacitors/Poly-Unelco.html

:)


From synthlist at gmail.com  Mon Apr  2 18:47:11 2007
From: synthlist at gmail.com (ryan williams)
Date: Mon, 2 Apr 2007 11:47:11 -0500
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <105586.3013.qm@web27607.mail.ukl.yahoo.com>
References: <20070402063210.GB47569@moo.sysabend.org>
	<105586.3013.qm@web27607.mail.ukl.yahoo.com>
Message-ID: <6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>

i used protel dxp which i think is just the last version before
altium. I made around 10 PCB layouts with it. I thought it was really
easy to learn and use compared to other programs (orcad, eagle, kicad)
and still powerful enough to do anything i wanted and much more. But
this program is bloated as jim says. I couldn't imagine paying that
much for it even if i owned a company that needed something like that.

i've seen altium run and it looks just like protel dxp anyway.

On 4/2/07, karl dalen <dalenkarl at yahoo.se> wrote:
> As far as i know its just names of programs, still the same old
> Autotrax! :-)
>
> I heard that Altium is gong to rename it back to Protel!!!
>
> Well, when things comes to Protel the last stable version was Protel99SE,
> the following Altium releases was anything from plaan disasters to
> very expencive disasters, however that has been fairly sorted out
> as they say?!
>
> Altium is a mess of various tools from other wendors that Altium has bought.
>
> Altium/Protel was/is famous for its non working autoroters! :-)
>
> Im shure there is plenty of better/cheaper alternatives today!
>
> As i previously said buying EDA tools are like buying a car!
>
> KD
>
>
> --- Tom Arnold <xyzzy at sysabend.org> skrev:
>
> > I know at least a few people on here have used Protel, has anyone used
> > Altium Designer?  It looks like Altium has killed off Protel and only Altium
> > Designer is available now, but I cant find many comparisons between them.
> >
> > I've been reading some bad things about later versions of Protel anyway so
> > maybe Altium isnt a path I even want to consider, but Protel seems to have
> > an exceedingly strong following so I want to look into it.
> >
> > Downloading Proteus right now to give it a spin around the block...  This
> > will make the 9th or 10th package I've looked at today and sofar all have
> > failed my rather simple tests.  ( personal preference tests, nothing
> > "broken" about most of them... ).
> >
> > --
> >  -----------------------------------------------------------------
> >  - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
> >  - SynthGeek        -
> >  - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
> >  - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
> >  --------------------
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
>
>
>
>
>
> _________________________________________________________
> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From synthlist at gmail.com  Mon Apr  2 18:49:13 2007
From: synthlist at gmail.com (ryan williams)
Date: Mon, 2 Apr 2007 11:49:13 -0500
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <200704021616.l32GGl56018985@linux7.lan>
References: <200704021616.l32GGl56018985@linux7.lan>
Message-ID: <6faa934b0704020949v4e1a512eia019071ae5814f28@mail.gmail.com>

http://www.sdiy.org/destrukto
ryan williams

> >> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> >> some rather ancient and dusty links.
> >>
> >> Let me know if you want a link [added/removed/changed] there to your own
> >> home page, or the page with your synth-diy things.
> >> --
> >> Rick Jansen


From tim.parkhurst at gmail.com  Mon Apr  2 20:11:51 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Mon, 2 Apr 2007 11:11:51 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <87441170704021111l524cb166lf0851116adcf9622@mail.gmail.com>

Hi Rick,

Glad to have SDIY back. Thanks!

Could you please add www.magsmoke.com
(Magic Smoke Electronics)

Cheers,

Tim (adder) Servo


On 4/2/07, Rick Jansen <rick.jansen at xs4all.nl> wrote:
> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
>
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> --
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
"Imagination is more important than knowledge." - Albert Einstein


From aym-htnys at teaser.fr  Mon Apr  2 20:56:10 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Mon, 2 Apr 2007 20:56:10 +0200
Subject: [sdiy-interim] vermine -> dropmix
In-Reply-To: <89278f010704021116r459cc70yf7acff9f181a2478@mail.gmail.com>
References: <89278f010704021116r459cc70yf7acff9f181a2478@mail.gmail.com>
Message-ID: <20070402185610.GA2505@vulcain.knox.com>

On 2007-04-02 13:16 -0500, Spencer Johnson wrote:

> Does anyone have any good designs for a synth keyboard or organ?

The main list (synth-diy at dropmix.xs4all.nl) is back up. I'll keep
synth-diy at vermine.org around but use it for emergencies only.
Having two active lists would create more problems than it would
solve.

To (re-)subscribe to the main list, go to

  http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

Rick, is there a way to synchronise both lists so that people who
sub/unsub to/from the main list are automatically sub/unsub'd
to/from the backup list ?

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.

_____________________________________________________________________
This is the interim list for synth-diy at dropmix.xs4all.nl.
To post, synth-diy at vermine.org
To unsubscribe, http://vermine.org/cgi-bin/mailman/listinfo/synth-diy


From ijfritz at comcast.net  Mon Apr  2 21:11:19 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Mon, 02 Apr 2007 13:11:19 -0600
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <6.2.1.2.2.20070402130959.02069de8@mail.comcast.net>

At 09:33 AM 4/2/2007, you wrote:
>As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>some rather ancient and dusty links.
>
>Let me know if you want a link [added/removed/changed] there to your own
>home page, or the page with your synth-diy things.
>--

Hi Rick --

My site has been moved to
http://home.comcast.net/~ijfritz/index.htm

Thanks!

   Ian 



From ijfritz at comcast.net  Mon Apr  2 21:14:17 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Mon, 02 Apr 2007 13:14:17 -0600
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <001201c7753f$0464e8e0$6701a8c0@cheetah>
References: <46112259.8020902@xs4all.nl>
	<001201c7753f$0464e8e0$6701a8c0@cheetah>
Message-ID: <6.2.1.2.2.20070402131241.0206ad00@mail.comcast.net>

At 09:53 AM 4/2/2007, you wrote:
>Rick,
>
>I coordinate the annual Pacific Northwest Synthesizer Meeting. There is 
>also limited information on my homemade synthesizer at www.sound-photo.com 
>Oh yes, and a pretty good list of links.

Hi John --

If you have a chance could you uptdate my link?
http://http://home.comcast.net/~ijfritz
Thanks!

   Ian 



From sounddoctorin at imt.net  Mon Apr  2 21:32:41 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 02 Apr 2007 12:32:41 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <46115A59.3010905@imt.net>

I think the old crow page got changed probably but still exists.  Might 
want to add my www.imt.net/~sounddoctorin/synthtec page -Bob

Rick Jansen wrote:

>As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>some rather ancient and dusty links.
>
>Let me know if you want a link [added/removed/changed] there to your own
>home page, or the page with your synth-diy things.
>  
>


From jean-pierre.desrochers at ville.quebec.qc.ca  Mon Apr  2 21:35:59 2007
From: jean-pierre.desrochers at ville.quebec.qc.ca (jean-pierre.desrochers at ville.quebec.qc.ca)
Date: Mon, 2 Apr 2007 15:35:59 -0400 
Subject: [sdiy] test..
Message-ID: <536941FCDB4586449B3BCDF92FBEAA7B017DF087@srv3057000554.ville.quebec.qc.ca>


test

Jean-Pierre Desrochers
technicien en ?lectronique
Signaux lumineux
Ville de Qu?bec



From obl64 at ix.netcom.com  Mon Apr  2 21:54:48 2007
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Mon, 02 Apr 2007 12:54:48 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <46115F88.7000707@ix.netcom.com>

Hi Rick,
Please add mine:
http://www.analogcreations.com
Thanks!
- Oren

Rick Jansen wrote:
> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.


From xyzzy at sysabend.org  Mon Apr  2 22:18:26 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Mon, 2 Apr 2007 13:18:26 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <20070402201826.GD47569@moo.sysabend.org>

On Mon, Apr 02, 2007 at 05:33:45PM +0200, Rick Jansen wrote:
> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.

Could you add two links.

http://www.sdiy.org - Home to many Synth-DIYer websites and free webspace for
more.

http://www.emusic-diy.org - The Emusic-DIY Archive

Thanks!

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From music.maker at gte.net  Mon Apr  2 22:19:57 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Mon, 02 Apr 2007 13:19:57 -0700
Subject: [sdiy] List home page, and links to your home pages -- OOPS
Message-ID: <200704022019.l32KJvSt019491@linux7.lan>


 Scots Gravenhorst

 should be

 Scott Gravenhorst

(c:

Thanks

synthesizer diy electronics <synth-diy at dropmix.xs4all.nl> wrote:
>Hi Rick,
>Please add mine:
>http://www.analogcreations.com
>Thanks!
>- Oren
>
>Rick Jansen wrote:
>> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>> some rather ancient and dusty links.
>> 
>> Let me know if you want a link [added/removed/changed] there to your own
>> home page, or the page with your synth-diy things.
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From sasami at hotkey.net.au  Mon Apr  2 22:20:41 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Tue,  3 Apr 2007 06:20:41 +1000 (EST)
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
	uncles and graverobbers
Message-ID: <20070402202041.956C48BC2EC@mailout2.hotkey.net.au>

>I too have been looking for a pcb for a 317-337 adjustable linear
>supply with a small footprint.  I can't find a reputable dealer that
>will just sell a board.  You would think something like that would be
>very common

I have a 6" x2" board for such. Not exactly "small footprint" but half of it
is just connectors and could be hacked off.

Ken
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From m.bareille at free.fr  Mon Apr  2 22:44:30 2007
From: m.bareille at free.fr (m.bareille at free.fr)
Date: Mon, 02 Apr 2007 22:44:30 +0200
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <1175546670.46116b2ed1850@imp.free.fr>

Hi Rick,

> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.

I will be pleased to be linked here
http://m.bareille.free.fr  (aka  Papareil Synth Labs )

I will add  a big link to the Synth DIY list, on my site , i think there none
for the moment ( but i am not sure in fact , there are so many pages ...)

Cheers,

Marc B.






From xyzzy at sysabend.org  Mon Apr  2 22:48:53 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Mon, 2 Apr 2007 13:48:53 -0700
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>
References: <20070402063210.GB47569@moo.sysabend.org>
	<105586.3013.qm@web27607.mail.ukl.yahoo.com>
	<6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>
Message-ID: <20070402204853.GE47569@moo.sysabend.org>

So, I've gotten several responces on Protel/Altium, and they all seem to fit
what I got from 4 hours with the Eval last night.  Its big, its expensive, its
sometimes not terribly stable, and you either like it or you don't.

It felt kinda like driving a VW Van full of bags of cement, up a hill, in high
wind to use the Used Car analogy...

I have a small set of personal criteria that I use for seeing how much time I'm
going to spend testing a package.

1. Quick look at depth of parts library.  How many?  Analog depth?
2. Quick look at existing devices.  Are multi-part devices broken up into
multiple parts?  Several packages I looked at packaged TL074's into large
multipin blobs.
3. Assuming multipart parts are multipart, how well does placing them work?
Does it automatically place PartA then B then C or do you place a bunch of A's
and then go back and unify them into a single part?
4. Place a few components ( 555 timer circuit ) and connect them.  Does it
"feel" right.  Do things snap to grid cleanly?
5. Create a new schematic symbol.  Judge painfulness.  Make it multipart.
6. Export netlist into PCB design.  
7. Create footprint for custom part.  Pain?
8. Do quick board layout for 555 timer circuit.  Rip up a track, does the
ratsnest reappear? ( yes, I like using ratsnests )
9. Can I arbitrarily create PCB features like copper pours and the like and
electrically link them, or do I have to do something non-intutive involving
tweaking the netlist?

There are of course other things I can't quite define that are on the mental
version of this list.  As short as this list is, its surprising how many things
fail it in some annoying way or another.  In fact, I looked at 20 some EDA
packages this weekend including a couple from my distant past, and they all
failed except, sofar, Proteus.  My "short list" right now in fact is just Eagle
and Proteus.  Eagle is far from ideal, but it has other advantages that might
offset its annoyances.

I'd be interested in hearing other persons pet peeves with EDA packages too,
might just remind me of something I've forgotten I hated.  One amusing thing
I've noted...  
In all cases ( PADS/Designworks/Orcad ) of the packages I used years ago,
they all annoy the heck out of me now.  Sadly.

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From ijfritz at comcast.net  Mon Apr  2 22:52:07 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Mon, 02 Apr 2007 14:52:07 -0600
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <6.2.1.2.2.20070402145001.020ade58@mail.comcast.net>

At 09:33 AM 4/2/2007, you wrote:
>As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>some rather ancient and dusty links.
>
>Let me know if you want a link [added/removed/changed] there to your own
>home page, or the page with your synth-diy things.
>--
>Rick Jansen

Rick --

I see that when I click  "single reply" in my mail program, the reply goes 
to the list as well as the originator.  Is this what we want?  It used to 
go just to the originator.

   Ian 



From cynthia.webster at gte.net  Mon Apr  2 22:53:32 2007
From: cynthia.webster at gte.net (Cynthia Webster)
Date: Mon, 02 Apr 2007 13:53:32 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <87441170704021111l524cb166lf0851116adcf9622@mail.gmail.com>
References: <46112259.8020902@xs4all.nl>
	<87441170704021111l524cb166lf0851116adcf9622@mail.gmail.com>
Message-ID: <46116D4C.6040107@gte.net>

Hi Rick!

Please add this link

Cynthia Webster  / Synapse Magazines    http://www.cyndustries.com/

Thanks!


Cynthia


Tim Parkhurst wrote:
> Hi Rick,
>
> Glad to have SDIY back. Thanks!
>
> Could you please add www.magsmoke.com
> (Magic Smoke Electronics)
>
> Cheers,
>
> Tim (adder) Servo
>
>
> On 4/2/07, Rick Jansen <rick.jansen at xs4all.nl> wrote:
>> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>> some rather ancient and dusty links.
>>
>> Let me know if you want a link [added/removed/changed] there to your own
>> home page, or the page with your synth-diy things.
>> -- 
>> Rick Jansen
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
>



From wonggster at gmail.com  Mon Apr  2 23:07:12 2007
From: wonggster at gmail.com (gino wong)
Date: Mon, 2 Apr 2007 17:07:12 -0400
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
	uncles and graverobbers
In-Reply-To: <20070402202041.956C48BC2EC@mailout2.hotkey.net.au>
References: <20070402202041.956C48BC2EC@mailout2.hotkey.net.au>
Message-ID: <18ef0b50704021407p6b74bc29x8fbb1e71a0ac1f16@mail.gmail.com>

Hi Ken,

If it is suitable for an EMS vcs3 +12- 9 adjustable I'll be ordering.

gino

On 4/2/07, Ken Stone <sasami at hotkey.net.au> wrote:
> >I too have been looking for a pcb for a 317-337 adjustable linear
> >supply with a small footprint.  I can't find a reputable dealer that
> >will just sell a board.  You would think something like that would be
> >very common
>
> I have a 6" x2" board for such. Not exactly "small footprint" but half of it
> is just connectors and could be hacked off.
>
> Ken
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From seb at burnit.co.uk  Mon Apr  2 23:28:08 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Mon, 02 Apr 2007 22:28:08 +0100
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <20070402204853.GE47569@moo.sysabend.org>
References: <20070402063210.GB47569@moo.sysabend.org>	<105586.3013.qm@web27607.mail.ukl.yahoo.com>	<6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>
	<20070402204853.GE47569@moo.sysabend.org>
Message-ID: <46117568.5060803@burnit.co.uk>

Hi Tom,

Quickly reading your list of criteria I was thinking Proteus.  Then I 
saw you found this already yourself.  I use version 5.2 and have been 
very happy with it.  Got a few quirks - for example non-standard 
keyboard shortcuts and mouse button use (although I believe they've now 
changed these things in later versions).

Only problem may be the price - it's very reasonable for small (low 
pincount) PCBs, but gets kind of expensive for larger designs.

Seb


Tom Arnold wrote:
> So, I've gotten several responces on Protel/Altium, and they all seem to fit
> what I got from 4 hours with the Eval last night.  Its big, its expensive, its
> sometimes not terribly stable, and you either like it or you don't.
>
> It felt kinda like driving a VW Van full of bags of cement, up a hill, in high
> wind to use the Used Car analogy...
>
> I have a small set of personal criteria that I use for seeing how much time I'm
> going to spend testing a package.
>
> 1. Quick look at depth of parts library.  How many?  Analog depth?
> 2. Quick look at existing devices.  Are multi-part devices broken up into
> multiple parts?  Several packages I looked at packaged TL074's into large
> multipin blobs.
> 3. Assuming multipart parts are multipart, how well does placing them work?
> Does it automatically place PartA then B then C or do you place a bunch of A's
> and then go back and unify them into a single part?
> 4. Place a few components ( 555 timer circuit ) and connect them.  Does it
> "feel" right.  Do things snap to grid cleanly?
> 5. Create a new schematic symbol.  Judge painfulness.  Make it multipart.
> 6. Export netlist into PCB design.  
> 7. Create footprint for custom part.  Pain?
> 8. Do quick board layout for 555 timer circuit.  Rip up a track, does the
> ratsnest reappear? ( yes, I like using ratsnests )
> 9. Can I arbitrarily create PCB features like copper pours and the like and
> electrically link them, or do I have to do something non-intutive involving
> tweaking the netlist?
>
> There are of course other things I can't quite define that are on the mental
> version of this list.  As short as this list is, its surprising how many things
> fail it in some annoying way or another.  In fact, I looked at 20 some EDA
> packages this weekend including a couple from my distant past, and they all
> failed except, sofar, Proteus.  My "short list" right now in fact is just Eagle
> and Proteus.  Eagle is far from ideal, but it has other advantages that might
> offset its annoyances.
>
> I'd be interested in hearing other persons pet peeves with EDA packages too,
> might just remind me of something I've forgotten I hated.  One amusing thing
> I've noted...  
> In all cases ( PADS/Designworks/Orcad ) of the packages I used years ago,
> they all annoy the heck out of me now.  Sadly.
>
>   



From xyzzy at sysabend.org  Tue Apr  3 00:07:35 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Mon, 2 Apr 2007 15:07:35 -0700
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <46117568.5060803@burnit.co.uk>
References: <20070402063210.GB47569@moo.sysabend.org>
	<105586.3013.qm@web27607.mail.ukl.yahoo.com>
	<6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>
	<20070402204853.GE47569@moo.sysabend.org>
	<46117568.5060803@burnit.co.uk>
Message-ID: <20070402220735.GF47569@moo.sysabend.org>

On Mon, Apr 02, 2007 at 10:28:08PM +0100, Seb Francis wrote:
> Quickly reading your list of criteria I was thinking Proteus.  Then I 
> saw you found this already yourself.  I use version 5.2 and have been 
> very happy with it.  Got a few quirks - for example non-standard 
> keyboard shortcuts and mouse button use (although I believe they've now 
> changed these things in later versions).

My list of criteria isnt exactly extensive, its just my shortlist of complaints
that have driven me nuts in the past. :-)

> Only problem may be the price - it's very reasonable for small (low 
> pincount) PCBs, but gets kind of expensive for larger designs.

Price isnt an issue.  Looks like Proteus configured the way I want will run
around $3100 including the most basic version of Electra, and I havent even
decided if I want to bother with Electra or not...

I've let price be my guide in the past and its meant several gray hairs and
lost productivity, this time I'm getting what will work and damn the price.

-- 
 --------------------------------------------------------------------
 - Tom Arnold           -  "...is it a virus, a drug, or a religion?"  
 - Sysabend Caretaker   -    Juanita Shrugs. "What's the difference?"
 ------------------------       -- Neal Stephenson,  Snow Crash 



From marxspeakstruth at gmail.com  Tue Apr  3 00:27:47 2007
From: marxspeakstruth at gmail.com (Spencer Johnson)
Date: Mon, 2 Apr 2007 17:27:47 -0500
Subject: [sdiy] Organ Designs
Message-ID: <89278f010704021527u13c02486sd90884f8eb408000@mail.gmail.com>

Does anyone have any good designs for a synth keyboard or organ? I'm
trying to figure out how to do mine, and i'm at a standstill.
Mechanical drawings, conceptual designs, etc. are greatly appreciated.

-spencer


From sounddoctorin at imt.net  Tue Apr  3 00:32:28 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 02 Apr 2007 15:32:28 -0700
Subject: [sdiy] Capacitor substitution
In-Reply-To: <46112B18.2030501@clickbang.com>
References: <46112B18.2030501@clickbang.com>
Message-ID: <4611847C.7070002@imt.net>

Jeff's link is for 51pf, and up.  That at least gets you one value you 
need and again you can put those in series combinations..eg. two of the 
62pf or whatever to make close enough toa 33pf.   3 of them to make 
close enough to a 20pf unit.  Those...62pf 5% ones...why are they more 
expensive...?  Well I'd..steer away from those.  Maybe they are .5% ya 
think? They're all 2.5% otherwise but that's of course initial value 
tolerence not drift I'm sure :-).  -Bob

mrmike wrote:

> Having failed in my search for small value (<100pF) polystyrene caps, 
> I was looking at a quality substitution. I can't find any 
> polycarbonate either. Or polypropylene.
>
> Would a good mica (rated at +/- 1pF tolerance) be a good substitute?
>
> mrmike
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>


From sounddoctorin at imt.net  Tue Apr  3 01:25:52 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 02 Apr 2007 16:25:52 -0700
Subject: [sdiy] arp submodule question ..5400601F ?
In-Reply-To: <NHBBIFCEGLMEBDNBDAJHEEAEGAAA.eric@piramiden.demon.nl>
References: <NHBBIFCEGLMEBDNBDAJHEEAEGAAA.eric@piramiden.demon.nl>
Message-ID: <46119100.2000705@imt.net>

Thanks for the insight Eric.  I rechecked things and was in error.  
THere is a ground ref 1K on that one also.  So they must have kept the 
4034's input 1K resistors to ground on this rendition of the 4035 then, 
rather than the 3.3K ones shown in the diagram.  They are also precision 
resistors but that's of no consequence in that location obviously.  
Probably just had a lot of stock on hand :-) Thanks again, -bob

Eric van Baaren wrote:

>Hi Bob
>
>I have  two different 4034 and a 4035 in front of me and the differences are
>like you described except for the 1k resistor which isn't there.
>
>
>4035-004REV1 never potted - dual fet 2n3958 - tantalums on powerinput
>4034-003 REV-A  potted -two fets 2n5459 on the opposite side - metalcan
>lm301AH on the opposite side - tempco on opposite side - ceramic caps on
>powerinput
>the other 4034-003 REV-A   potted - 2n3958 - lm301AN opposite side - the
>rest looks the same
>
>Best,
>
>Eric van Baaren.
>_________________
>http://www.sainteric.eu
>
>
>
>
>-----Oorspronkelijk bericht-----
>Van: synth-diy-bounces at dropmix.xs4all.nl
>[mailto:synth-diy-bounces at dropmix.xs4all.nl]Namens Bob Weigel
>Verzonden: maandag 2 april 2007 7:42
>Aan: synthdiy
>Onderwerp: [sdiy] arp submodule question ..5400601F ?
>
>
>I get no hits related on that number.  That's the only one on these
>boards.  I had thought they were 4034 or 5's.  On closer examination
>though....
>
>1) I have a 4034 here.  It's absolutely NOT the same.  The design of the
>board is totally different.  Op amp on opposite end etc.  The rev. A I
>have has discrete FET's.  These have a dual FET in a can.  But ALSO the
>schematic deviates.  There is no 1K resistor attached to one of the
>input sides but there is on the other. (Pin 12 on the Z2 3086).  So I
>just wondered before I probe my life away if anyone has a clue what
>these things are from.  I got half a dozen or so in Tim Smith's stuff.
>The first one oscillates at some high requency.  Wasn't the output op amp.
>
>But anyway..these are obviously later models because there is no sign
>they were potted ever.  The 4072 and 75 use the LM3900 with transistor
>pairs.  Rather than 4 3086's.  So I'm not finding a match in any of the
>diagrams I can find on the arp submodules page exactly. -Bob
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
>  
>


From davebr at earthlink.net  Tue Apr  3 02:22:52 2007
From: davebr at earthlink.net (David Brown)
Date: Mon, 02 Apr 2007 17:22:52 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <0JFW00F56BQ3WY41@vms046.mailsrvcs.net>

Please add me.

Dave Brown at http://modularsynthesis.com/

At 08:33 AM 4/2/2007, Rick Jansen wrote:
>As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>some rather ancient and dusty links.
>
>Let me know if you want a link [added/removed/changed] there to your own
>home page, or the page with your synth-diy things.
>--
>Rick Jansen



From davebr at earthlink.net  Tue Apr  3 02:27:12 2007
From: davebr at earthlink.net (David Brown)
Date: Mon, 02 Apr 2007 17:27:12 -0700
Subject: [sdiy] modular power supplies + lightweight cousins aunts,
	uncles and graverobbers
In-Reply-To: <18ef0b50704020845y61d2c020i3e747e3465310be7@mail.gmail.com >
References: <20070402083921.DA9488BC3D6@mailout2.hotkey.net.au>
	<18ef0b50704020845y61d2c020i3e747e3465310be7@mail.gmail.com>
Message-ID: <0JFW005N0BXCL7F4@vms044.mailsrvcs.net>

I was looking for this same thing (although +/-15) and ended up 
buying a Blacet PS-500.  It has a fairly small footprint and has 
about a half a dozen output connectors that made it nice.  I took it 
out of the enclosure and built it into a cabinet with a new front 
panel with a lighted mains switch and IEC connector/fuse.

Dave

At 08:45 AM 4/2/2007, gino wong wrote:
>I too have been looking for a pcb for a 317-337 adjustable linear
>supply with a small footprint.  I can't find a reputable dealer that
>will just sell a board.  You would think something like that would be
>very common



From loscha at gmail.com  Tue Apr  3 02:37:30 2007
From: loscha at gmail.com (Loscha)
Date: Tue, 3 Apr 2007 10:37:30 +1000
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <0JFW00F56BQ3WY41@vms046.mailsrvcs.net>
References: <46112259.8020902@xs4all.nl>
	<0JFW00F56BQ3WY41@vms046.mailsrvcs.net>
Message-ID: <17035a3d0704021737r3fda8495nf845be505c5d4428@mail.gmail.com>

My page is www.loscha.com
I have some synthy stuff on there - mostly the Yamaha Black Boxes
stuff (Service manuals, etc). I do have a DIY page waiting in the
wings to be be finished -- some pics of stuff I've done - bends and
mods.

-Edward

On 4/3/07, David Brown <davebr at earthlink.net> wrote:
> Please add me.
>
> Dave Brown at http://modularsynthesis.com/
>
> At 08:33 AM 4/2/2007, Rick Jansen wrote:
> >As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> >some rather ancient and dusty links.
> >
> >Let me know if you want a link [added/removed/changed] there to your own
> >home page, or the page with your synth-diy things.
> >--
> >Rick Jansen
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
www.loscha.com


From patchell at cox.net  Tue Apr  3 03:19:40 2007
From: patchell at cox.net (Jim Patchell)
Date: Mon, 02 Apr 2007 18:19:40 -0700
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <4611ABAC.9090609@cox.net>

Rick Jansen wrote:
> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
>
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
>   
Please Add....

Jim Patchell
http://www.noniandjim.com/Jim/index.html

-Jim





From guitaricon at comcast.net  Tue Apr  3 04:23:28 2007
From: guitaricon at comcast.net (jeff brown)
Date: Mon, 2 Apr 2007 22:23:28 -0400
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <003901c77597$125f1080$0502a8c0@D10N1J61>

You can add me -

Jeff Brown  www.guitarfool.com


----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 02, 2007 11:33 AM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From dlmanley at sonic.net  Tue Apr  3 06:41:25 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Mon, 02 Apr 2007 21:41:25 -0700
Subject: [sdiy] Altrium Designer/Protel
In-Reply-To: <C2368A12.A0AC%sdiy@oveloe.com>
References: <C2368A12.A0AC%sdiy@oveloe.com>
Message-ID: <4611DAF5.9050604@sonic.net>

Charles Bisaillon wrote:
> In the end, we have nothing to complain about except that a trace is missing
> in the VCF. We are still unsure whether this was connected or not in the
> schematic although everything seemed fine.
Many tools allow you can to generate a netlist, or a cross reference 
that shows all nets connected to each pin on each device.  Examining 
these can be an easy way to find problems.  It is also easy to write 
some perl to parse these to look for things like nets with only one 
connection.  Better tools can do a design rule check (DRC) if the 
libraries have been built correctly.  This allows you to find nets with 
no or multiple drivers.

Watch out if your schematic capture package allows you to turn off the 
snap grid.  I have had a board come back with a missing net.  Examining 
the schematic you could see a 1 pixel gap in the middle of a wire.  
Someone had gone off grid and thought they'd made a connection - when 
zoomed out it looked like they did.

-Dave


From Peter.Ullrich at kapsch.net  Tue Apr  3 08:16:10 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Tue, 3 Apr 2007 08:16:10 +0200
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46115F88.7000707@ix.netcom.com>
Message-ID: <9CD8492A66A7044FA79781634DD9398501DA6675@S060VS01.kapsch.co.at>

Hello Rick!

Please add my homepage too! 
Some of my projects can be found on my music pages and some on 
my downloads page (reachable from the main page).

http:/www.ullrich.at.tt

Thanx!

Ciao
Peter

Rick Jansen wrote:
> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> 
> with some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your 
> own home page, or the page with your synth-diy things.

The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From hughes_david_j at btopenworld.com  Tue Apr  3 09:09:48 2007
From: hughes_david_j at btopenworld.com (David J. Hughes)
Date: Tue, 03 Apr 2007 08:09:48 +0100
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
Message-ID: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>

Rick,

on 2/4/07 4:33 pm, Rick Jansen at rick.jansen at xs4all.nl wrote:

> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.

Could you please add David Hughes, http://www.infectionmusic.co.uk to the
list of links.

The Paul Maddox site, modulus.synth.net, no longer exists.

Thanks
    David
-- 
Infection Music Limited.                     http://www.infectionmusic.co.uk

This e-mail and any files transmitted with it are confidential and intended
for the addressee only. If you are not the addressee you may not copy,
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whatsoever. If you have received this e-mail in error please notify the
sender and ensure that all copies of this e-mail and any files transmitted
with it are deleted. Any views or opinions represented in this e-mail are
solely those of the author and do not necessarily represent those of
Infection Music. Although this e-mail and its attachments have been scanned
for the presence of computer viruses, Infection Music will not be liable for
any losses as a result of any viruses being passed on.




From elby_designs at ozemail.com.au  Tue Apr  3 10:00:11 2007
From: elby_designs at ozemail.com.au (Laurie Biddulph)
Date: Tue, 3 Apr 2007 18:00:11 +1000
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <008201c775c6$9e5f5250$0301010a@OFFICE>

hi,

Would appreciate it if you could add me to the list

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com

This e-mail and any files transmitted with it are confidential and intended 
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or 
otherwise use it, or any part of it, in any form whatsoever. If you have 
received this e-mail in error please notify the sender and ensure that all 
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the 
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence 
of computer viruses, Elby Designs will not be liable for any losses as a 
result of any viruses being passed on.

----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 03, 2007 1:33 AM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
>
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From daniel.araya at sr.se  Tue Apr  3 10:39:26 2007
From: daniel.araya at sr.se (Daniel Araya)
Date: Tue, 03 Apr 2007 10:39:26 +0200
Subject: Sv: [sdiy] modular power supplies + lightweight cousins
	aunts,uncles and graverobbers
Message-ID: <s6122ef2.001@rhcl03n02.sr.se>

I have found nice switching lightweight supplys that are good for audio
use from Schroff and Delta. they are ususally about 2,5A per rail so you
might need two. Usually they are trimmable between +/-15 & 12v.
They are expensive if you need to buy them, I have found mine in old
telecom/broadcast equipment.

/d

>>> abisset at dspaudio.com 2007-04-02 10:17:49 >>>
the serge retrofit is getting to the stage where i need to consider
power supplies.  i'm traveling a lot, so i'm wondering how viable
it would be to build a reasonably lightweight filtering circuit so that
i
could use standard crappy pc atx power supplies?  Anybody attempted
this?
On this note, i can't find a single atx supply with more than 0.8amp
on
the -12v rail... anybody know of a balanced atx supply?

Anyway,
at the moment i'm using a power-one hdcc and it's great, however it
weighs almost 30 pounds.  And the fact that i need a second supply for
another bit of kit brings us to almost 40 pounds of electricity.

I could purchase 3 of these and leave them on three different
landmasses
but even lugging them around is a hassle and there's the chance i'll be
in
other cities and again confronted with finding a power supply.

I need at least 3.4amp's on the +/-12v rails..  Since there is some
jcd
involved, it'd be ideal to have a small .5amp tap at +/- 15v with 3.2a
or
so on +/-12v and whatever on 5.

-anthony
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl 
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From dalenkarl at yahoo.se  Tue Apr  3 12:14:12 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 3 Apr 2007 12:14:12 +0200 (CEST)
Subject: SV: Re: [sdiy] Altrium Designer/Protel
In-Reply-To: <4611DAF5.9050604@sonic.net>
Message-ID: <821605.99804.qm@web27608.mail.ukl.yahoo.com>

Speaking of going off grid, how many of you have 
switched into designing PCB's in mm instead of mil??

Yes, there has been a change, all new PCB's shall be
designed in mm thesedays as they say! 

KD

-- Dave Manley <dlmanley at sonic.net> skrev:

> Charles Bisaillon wrote:
> > In the end, we have nothing to complain about except that a trace is
> missing
> > in the VCF. We are still unsure whether this was connected or not in the
> > schematic although everything seemed fine.
> Many tools allow you can to generate a netlist, or a cross reference 
> that shows all nets connected to each pin on each device.  Examining 
> these can be an easy way to find problems.  It is also easy to write 
> some perl to parse these to look for things like nets with only one 
> connection.  Better tools can do a design rule check (DRC) if the 
> libraries have been built correctly.  This allows you to find nets with 
> no or multiple drivers.
> 
> Watch out if your schematic capture package allows you to turn off the 
> snap grid.  I have had a board come back with a missing net.  Examining 
> the schematic you could see a 1 pixel gap in the middle of a wire.  
> Someone had gone off grid and thought they'd made a connection - when 
> zoomed out it looked like they did.
> 
> -Dave
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
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From dragon.servicing at virgin.net  Tue Apr  3 12:21:16 2007
From: dragon.servicing at virgin.net (Peter Blackett)
Date: Tue, 03 Apr 2007 11:21:16 +0100
Subject: [sdiy] List home page link
In-Reply-To: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
References: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
Message-ID: <46122A9C.9050205@virgin.net>

Hi,
pleased the list is back up.
I checked the modulus.synth.net site and it does still exist.
I will update my web page that does have some diy links on it when I get 
a chance ......
regards Peter

P.S the link to the Harris semiconductor site should go to the Intersil 
site as they have taken over some of the ic production. 
http://www.intersil.com


>Could you please add David Hughes, http://www.infectionmusic.co.uk to the
>list of links.
>
>The Paul Maddox site, modulus.synth.net, no longer exists.
>
>Thanks
>    David
>  
>


From dragon.servicing at virgin.net  Tue Apr  3 12:21:53 2007
From: dragon.servicing at virgin.net (Peter Blackett)
Date: Tue, 03 Apr 2007 11:21:53 +0100
Subject: [sdiy] List home page link
In-Reply-To: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
References: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
Message-ID: <46122AC1.1090206@virgin.net>

Hi,
pleased the list is back up.
I checked the modulus.synth.net site and it does still exist.
I will update my web page that does have some diy links on it when I get 
a chance ......
regards Peter

P.S the link to the Harris semiconductor site should go to the Intersil 
site as they have taken over some of the ic production. 
http://www.intersil.com


>Could you please add David Hughes, http://www.infectionmusic.co.uk to the
>list of links.
>
>The Paul Maddox site, modulus.synth.net, no longer exists.
>
>Thanks
>    David
>  
>



From cfmd at bredband.net  Tue Apr  3 12:41:59 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Tue, 03 Apr 2007 12:41:59 +0200 (CEST)
Subject: [sdiy] List home page link
In-Reply-To: <46122A9C.9050205@virgin.net>
References: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
	<46122A9C.9050205@virgin.net>
Message-ID: <20070403.124159.-1345707056.cfmd@bredband.net>

From: Peter Blackett <dragon.servicing at virgin.net>
Subject: Re: [sdiy] List home page link
Date: Tue, 03 Apr 2007 11:21:16 +0100
Message-ID: <46122A9C.9050205 at virgin.net>

> Hi,

Hi Peter!

> pleased the list is back up.
> I checked the modulus.synth.net site and it does still exist.
> I will update my web page that does have some diy links on it when I get 
> a chance ......
> regards Peter
> 
> P.S the link to the Harris semiconductor site should go to the Intersil 
> site as they have taken over some of the ic production. 
> http://www.intersil.com

You rather mean Intersil that Harris bought and then tossed out so it went back
to be called Intersil? :)

Same buissness, different name. :)

Cheers,
Magnus - who found himself thanked in the linears of a just released album - really like the music!


From seb at burnit.co.uk  Tue Apr  3 15:08:30 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Tue, 03 Apr 2007 14:08:30 +0100
Subject: [sdiy] Altrium Designer/Protel / Proteus
In-Reply-To: <20070402220735.GF47569@moo.sysabend.org>
References: <20070402063210.GB47569@moo.sysabend.org>
	<105586.3013.qm@web27607.mail.ukl.yahoo.com>
	<6faa934b0704020947j7d18d9b9tb50474a42a4d36f8@mail.gmail.com>
	<20070402204853.GE47569@moo.sysabend.org>
	<46117568.5060803@burnit.co.uk>
	<20070402220735.GF47569@moo.sysabend.org>
Message-ID: <461251CE.9050403@burnit.co.uk>

Tom Arnold wrote:
> My list of criteria isnt exactly extensive, its just my shortlist of complaints
> that have driven me nuts in the past. :-)
>   


Well, having done quite a lot of stuff with Proteus (v5.2) I can say 
that I've never encountered a limitation that can't be worked around 
without too much fuss.  I will say that the auto-placement and 
auto-routing is pretty rubbish (can't speak for later versions or for 
Electra), but I much prefer to do all this by hand anyway.

One feature I really missed (which I believe exists in Protel DXP) is 
the ability to route a track at an exact spacing from an adjacent track, 
following all the bends, etc.  This is really useful when you're running 
a bus of tracks and trying to use the minimum space.  With Proteus 
(v5.2) you have to watch the mouse coordinate display and manually space 
the tracks exactly right (again, maybe they improved this by now?).

Seb




From hughes_david_j at btopenworld.com  Tue Apr  3 15:33:31 2007
From: hughes_david_j at btopenworld.com (David J. Hughes)
Date: Tue, 03 Apr 2007 14:33:31 +0100
Subject: [sdiy] List home page link
In-Reply-To: <46122AC1.1090206@virgin.net>
Message-ID: <C238163A.15AAC%hughes_david_j@btopenworld.com>

Peter,

on 3/4/07 11:21 am, Peter Blackett at dragon.servicing at virgin.net wrote:

> I checked the modulus.synth.net site and it does still exist.

The modulus.synth.net domain simply routes through to Paul's new site,
VacoLoco, which is his web site design operation. Paul has recently stated
that he no longer has any interest in synth diy. However, why not mail him
and see if he has changed his mind.

Cheers
    David
-- 
Infection Music Limited.                     http://www.infectionmusic.co.uk

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any losses as a result of any viruses being passed on.




From harrybissell at copper.net  Tue Apr  3 15:45:13 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Tue, 3 Apr 2007 13:45:13 -0000
Subject: [sdiy] Capacitor substitution
Message-ID: <380-22007423134513179@copper.net>

In small values, Ceramic COG (also called NP0)
are not a bad choice at all.

Mica are OK as well but they really don't
outperform the ceramics and are much more expensive

H^) harry


>
>
>
>---- Original Message ----
>From: mrmike at clickbang.com
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] Capacitor substitution
>Date: Mon, 02 Apr 2007 11:11:04 -0500
>
>>Having failed in my search for small value (<100pF) polystyrene
>caps, I 
>>was looking at a quality substitution. I can't find any
>polycarbonate 
>>either. Or polypropylene.
>>
>> Would a good mica (rated at +/- 1pF tolerance) be a good
>substitute?
>>
>>mrmike
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From jluciani at gmail.com  Tue Apr  3 16:03:16 2007
From: jluciani at gmail.com (John Luciani)
Date: Tue, 3 Apr 2007 10:03:16 -0400
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
References: <46112259.8020902@xs4all.nl>
Message-ID: <608bfe540704030703i6d224202r318d47daeca845a6@mail.gmail.com>

On 4/2/07, Rick Jansen <rick.jansen at xs4all.nl> wrote:

> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.

Please add my home page http://www.luciani.org

Thank you.

(* jcl *)

-- 
http://www.luciani.org


From johnspeth at yahoo.com  Tue Apr  3 16:11:56 2007
From: johnspeth at yahoo.com (John Speth)
Date: Tue, 3 Apr 2007 07:11:56 -0700 (PDT)
Subject: [sdiy] test
Message-ID: <712034.52889.qm@web53307.mail.re2.yahoo.com>

Hi-

I resubbed in digest mode.  I got one digest in the
past 3 days.  Testing to see if the list is working.

JJS



 
____________________________________________________________________________________
Bored stiff? Loosen up... 
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From samppa.tolvanen at gmail.com  Tue Apr  3 16:44:21 2007
From: samppa.tolvanen at gmail.com (Samppa Tolvanen)
Date: Tue, 3 Apr 2007 17:44:21 +0300
Subject: [sdiy] List home page link
In-Reply-To: <C238163A.15AAC%hughes_david_j@btopenworld.com>
References: <46122AC1.1090206@virgin.net>
	<C238163A.15AAC%hughes_david_j@btopenworld.com>
Message-ID: <fa1b0bd80704030744r58a858dfqc9610457a80afaa5@mail.gmail.com>

On 4/3/07, David J. Hughes <hughes_david_j at btopenworld.com> wrote:
>
> The modulus.synth.net domain simply routes through to Paul's new site,
> VacoLoco, which is his web site design operation. Paul has recently stated
> that he no longer has any interest in synth diy. However, why not mail him
> and see if he has changed his mind.
>
> Cheers
>     David

Strangest things - I thought synth.net was adminstrated by Paul? (I?d
really like getting proper answers for my whois queries)

And those recent news about "Defender" are quite interesting.

Samppa



From psychick at ptd.net  Tue Apr  3 16:44:37 2007
From: psychick at ptd.net (psychick at ptd.net)
Date: Tue, 03 Apr 2007 14:44:37 +0000
Subject: [sdiy] test
Message-ID: <040320071444.11666.461268550009D57600002D922160466648050C07080C979C9F@att.net>

i attempted to change my sub to digest and got a message that it was disabled...

i guess this has been changed then?



-------------- Original message ----------------------
From: John Speth <johnspeth at yahoo.com>
>
> Hi-
> 
> I resubbed in digest mode.  I got one digest in the
> past 3 days.  Testing to see if the list is working.
> 
> JJS
> 
> 
> 
>  
> ________________________________________________________________________________
> ____
> Bored stiff? Loosen up... 
> Download and play hundreds of games for free on Yahoo! Games.
> http://games.yahoo.com/games/front
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 




From mrmike at clickbang.com  Tue Apr  3 16:49:08 2007
From: mrmike at clickbang.com (mrmike)
Date: Tue, 03 Apr 2007 09:49:08 -0500
Subject: [sdiy] Capacitor substitution
In-Reply-To: <380-22007423134513179@copper.net>
References: <380-22007423134513179@copper.net>
Message-ID: <46126964.7040008@clickbang.com>

Thank you; I had wondered about that. It looks like a good place to 
start. Of course, I couldn't figure out why the schematic specd caps 
that seemed rare, and I checked again. I missed som zeros when making my 
parts list: 33pF instead of the readlily available 330pF. Duh.

Good advice for other designs, tho.

mrmike

harrybissell at copper.net wrote:
> In small values, Ceramic COG (also called NP0)
> are not a bad choice at all.
>
> Mica are OK as well but they really don't
> outperform the ceramics and are much more expensive
>
> H^) harry
>
>
>   
>>
>> ---- Original Message ----
>> From: mrmike at clickbang.com
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: RE: [sdiy] Capacitor substitution
>> Date: Mon, 02 Apr 2007 11:11:04 -0500
>>
>>     
>>> Having failed in my search for small value (<100pF) polystyrene
>>>       
>> caps, I 
>>     
>>> was looking at a quality substitution. I can't find any
>>>       
>> polycarbonate 
>>     
>>> either. Or polypropylene.
>>>
>>> Would a good mica (rated at +/- 1pF tolerance) be a good
>>>       
>> substitute?
>>     
>>> mrmike
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>       
>
>
>
>   



From mrmike at clickbang.com  Tue Apr  3 17:00:15 2007
From: mrmike at clickbang.com (mrmike)
Date: Tue, 03 Apr 2007 10:00:15 -0500
Subject: [sdiy] VCO autotune for poly analog modular
Message-ID: <46126BFF.5010907@clickbang.com>

Yes, I'm insane.
I'm trying to build a polyphonic analog modular based on five ASM-1s. 
Think Obie 4 voice, rather than Prophet-5, as a design style.  I would, 
however, like to be able to set an accurate single voice across all five 
modules. Basically, all five panels could have their own controls, but a 
switch on panel one will disable the front panel controls  on panels 2-5 
and slave them to the controls on panel one.  In this mode,  an autotune 
function would be useful.  Has anyone ever implemented one of these in a 
DIY polysynth?

I was thinking of having the tune function compare VCO freq at a given 
CV voltage at several points across the 0-5V range for each VCO, then 
create a lookup table with a compensation map for each VCO.  As each CV 
for each voice comes in, its corresponding spot in the table is found 
and the tuning offset voltage is added to the initial CV and then sent 
to the VCO. Is this a dopey idea?

Thoughts welcome!

mrmike


From elektrodwarf at yahoo.se  Tue Apr  3 17:21:39 2007
From: elektrodwarf at yahoo.se (Karl Ekdahl)
Date: Tue, 3 Apr 2007 17:21:39 +0200 (CEST)
Subject: SV: [sdiy] List home page, and links to your home pages
In-Reply-To: <46112259.8020902@xs4all.nl>
Message-ID: <273051.79978.qm@web26215.mail.ukl.yahoo.com>

Please add me, Knas, www.sdiy.org/knas

Karl

--- Rick Jansen <rick.jansen at xs4all.nl> skrev:

> As the list home page I have:
> <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link
> [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
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kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From Stromeko at Compuserve.DE  Tue Apr  3 18:41:39 2007
From: Stromeko at Compuserve.DE (ASSI)
Date: Tue, 3 Apr 2007 18:41:39 +0200
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
References: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
Message-ID: <200704031841.40158.Stromeko@Compuserve.DE>

On Dienstag, 3. April 2007 09:09, David J. Hughes wrote:
> The Paul Maddox site, modulus.synth.net, no longer exists.

The synth.net site with their subdomains is still active.  It is true 
that Paul has dropped the modulus-music.com domain last year, however 
Paul's DIY activities are forwarded to vacoloco.net, so old links to 
the DIY/synth.net side of Modulus should still work.


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+

Waldorf MIDI Implementation & additional documentation:
http://Synth.Stromeko.net/Downloads.html#WaldorfDocs



From billbigrig at yahoo.com  Tue Apr  3 19:23:00 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Tue, 3 Apr 2007 10:23:00 -0700 (PDT)
Subject: [sdiy] ASM-1
Message-ID: <601091.26998.qm@web32706.mail.mud.yahoo.com>

Howdy,

 What is an ASM-1. It sounds interesting.
Rig


 
____________________________________________________________________________________
Don't get soaked.  Take a quick peek at the forecast
with the Yahoo! Search weather shortcut.
http://tools.search.yahoo.com/shortcuts/#loc_weather


From moogah at gmail.com  Tue Apr  3 19:33:59 2007
From: moogah at gmail.com (Jeff Farr)
Date: Tue, 3 Apr 2007 13:33:59 -0400
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <46126BFF.5010907@clickbang.com>
References: <46126BFF.5010907@clickbang.com>
Message-ID: <78f89520704031033v7ac1418bq61da2b6474bfca90@mail.gmail.com>

I can't add much in technical terms here, but I've been thinking about
similar things myself lately for a XR2206 based sweep generator.  I
was thinking about using a MCU to control the frequency input to the
chip and the lookup table idea is how I figured an autotune feature is
best implemented.  However, I don't know the best way for the MCU to
measure the actual pitch of the oscillator.  The simplest way is
probably to feed the squarewave out from the osc to the MCU and count
the peaks, but IIRC I read something about using a reference
oscillator/phase cancellation and some sort of RMS measurement as
well.. sounds complicated..

On 4/3/07, mrmike <mrmike at clickbang.com> wrote:
> Yes, I'm insane.
> I'm trying to build a polyphonic analog modular based on five ASM-1s.
> Think Obie 4 voice, rather than Prophet-5, as a design style.  I would,
> however, like to be able to set an accurate single voice across all five
> modules. Basically, all five panels could have their own controls, but a
> switch on panel one will disable the front panel controls  on panels 2-5
> and slave them to the controls on panel one.  In this mode,  an autotune
> function would be useful.  Has anyone ever implemented one of these in a
> DIY polysynth?
>
> I was thinking of having the tune function compare VCO freq at a given
> CV voltage at several points across the 0-5V range for each VCO, then
> create a lookup table with a compensation map for each VCO.  As each CV
> for each voice comes in, its corresponding spot in the table is found
> and the tuning offset voltage is added to the initial CV and then sent
> to the VCO. Is this a dopey idea?
>
> Thoughts welcome!
>
> mrmike
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From debus at cityweb.de  Tue Apr  3 19:51:05 2007
From: debus at cityweb.de (Ingo Debus)
Date: Tue, 3 Apr 2007 19:51:05 +0200
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <78f89520704031033v7ac1418bq61da2b6474bfca90@mail.gmail.com>
References: <46126BFF.5010907@clickbang.com>
	<78f89520704031033v7ac1418bq61da2b6474bfca90@mail.gmail.com>
Message-ID: <26F98346-CF8B-4B77-B02E-3CECA68147E6@cityweb.de>


Am 03.04.2007 um 19:33 schrieb Jeff Farr:

> I can't add much in technical terms here, but I've been thinking about
> similar things myself lately for a XR2206 based sweep generator.  I
> was thinking about using a MCU to control the frequency input to the
> chip and the lookup table idea is how I figured an autotune feature is
> best implemented.  However, I don't know the best way for the MCU to
> measure the actual pitch of the oscillator.  The simplest way is
> probably to feed the squarewave out from the osc to the MCU and count
> the peaks, but IIRC I read something about using a reference
> oscillator/phase cancellation and some sort of RMS measurement as
> well.. sounds complicated..

Many MCUs have one or more timers with capture mode, i.e. when a  
rising falling edge (or falling edge is possible as well) on an input  
pin is detected the timer count is copied into a register. The timer  
itself run continuously with a high frequency (MHz range) at wraps  
around when it reaches its maximum count. Thus the time between two  
rising edges can be measured.

Ingo


From cfmd at bredband.net  Tue Apr  3 19:59:50 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Tue, 03 Apr 2007 19:59:50 +0200 (CEST)
Subject: [sdiy] ASM-1
In-Reply-To: <601091.26998.qm@web32706.mail.mud.yahoo.com>
References: <601091.26998.qm@web32706.mail.mud.yahoo.com>
Message-ID: <20070403.195950.95131249.cfmd@bredband.net>

From: bill bigrig <billbigrig at yahoo.com>
Subject: [sdiy] ASM-1
Date: Tue, 3 Apr 2007 10:23:00 -0700 (PDT)
Message-ID: <601091.26998.qm at web32706.mail.mud.yahoo.com>

> Howdy,
> 
>  What is an ASM-1. It sounds interesting.

Read up:

http://rubidium.dyndns.org/~magnus/synths/friends/stopp/

Cheers,
Magnus


From billbigrig at yahoo.com  Tue Apr  3 20:47:46 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Tue, 3 Apr 2007 11:47:46 -0700 (PDT)
Subject: [sdiy] buchla 700
Message-ID: <206612.17879.qm@web32711.mail.mud.yahoo.com>

Howdy,

 mpja.com has a bipolar 12vdc supply #6639-ps that
puts out 3.4 amps on both rails.
Rig


 
____________________________________________________________________________________
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Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.
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From billbigrig at yahoo.com  Tue Apr  3 20:59:06 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Tue, 3 Apr 2007 11:59:06 -0700 (PDT)
Subject: [sdiy] asm-1 autotune
Message-ID: <20070403185906.97096.qmail@web32713.mail.mud.yahoo.com>

Howdy,

 Sounds good to me.
Rig


 
____________________________________________________________________________________
TV dinner still cooling? 
Check out "Tonight's Picks" on Yahoo! TV.
http://tv.yahoo.com/


From rude66 at gmail.com  Tue Apr  3 22:19:34 2007
From: rude66 at gmail.com (rude66)
Date: Tue, 3 Apr 2007 22:19:34 +0200
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <200704031841.40158.Stromeko@Compuserve.DE>
References: <C237BC4B.15A8B%hughes_david_j@btopenworld.com>
	<200704031841.40158.Stromeko@Compuserve.DE>
Message-ID: <997df4b50704031319n22141393u8271ad0494a94500@mail.gmail.com>

i'm even an xs4all colleague.. ;-)

rude 66: www.xs4all.nl/~rude66

thanks!



On 4/3/07, ASSI <Stromeko at compuserve.de> wrote:
> On Dienstag, 3. April 2007 09:09, David J. Hughes wrote:
> > The Paul Maddox site, modulus.synth.net, no longer exists.
>
> The synth.net site with their subdomains is still active.  It is true
> that Paul has dropped the modulus-music.com domain last year, however
> Paul's DIY activities are forwarded to vacoloco.net, so old links to
> the DIY/synth.net side of Modulus should still work.
>
>
> Achim.
> --
> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+
>
> Waldorf MIDI Implementation & additional documentation:
> http://Synth.Stromeko.net/Downloads.html#WaldorfDocs
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From jays at aracnet.com  Tue Apr  3 22:57:03 2007
From: jays at aracnet.com (jays at aracnet.com)
Date: Tue, 3 Apr 2007 13:57:03 -0700
Subject: [sdiy] VCO autotune for poly analog modular
Message-ID: <200704032057.l33Kv3nL014671@sapphire.spiritone.com>

I do a lot of calibration code for test and measurement instruments and yes this is do-able. Biggest problem is that calibration is probably going to take a fair amount of time. Mainly because at low frequencies it will take time to get your samples and do a loop for the calibration.

First off don't base your calibration on a single period measurement. Measure the period of N cycles multiple times. Doing N cycles will minimize the error for a single cycle. Getting the multiple times, throwing out the high and low measurements and doing an average helps stablize the data.

Calculate the correction factor and do it again until things get into tune. Maybe use some sort of binary search to zone in on the value needed.

You might be able just to tune at octives and then use linear interpolation to get all the notes in between. So experiment and see what works best for you in your system.

Jay S.


From dalenkarl at yahoo.se  Tue Apr  3 23:06:28 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 3 Apr 2007 23:06:28 +0200 (CEST)
Subject: SV: Re: [sdiy] Altrium Designer/Protel / Proteus
In-Reply-To: <461251CE.9050403@burnit.co.uk>
Message-ID: <20070403210628.26575.qmail@web27614.mail.ukl.yahoo.com>

Thats done under design Rules tab, one can set as many rules as one wants
in protel and i would be suppriced if other PCB packages didnt have that
kind of design feature.

I think the whole EDA business has stagnated, this silly idea about
limiting a package to 500 pins in a design and or max 4 layers
limitations is nothing but fraudalent behaviur to squese out cash
from customers and offing potential customers.

There is really a need for a Linux GNU tool that kills off
all these protels,cadence, mentor crap! I dont give a 5 cent
for the pricing idea they have, the bigger and worser
they are the pricier they get, mentor boardstation
on Unix who uses that today?? 

The market is small for EDA tools yes, but that dosent
justify the silly pricing of the tools. 5000euro for
altium, you do get a decent car for that money. 

KD

--- Seb Francis <seb at burnit.co.uk> skrev:

> Tom Arnold wrote:
> > My list of criteria isnt exactly extensive, its just my shortlist of
> complaints
> > that have driven me nuts in the past. :-)
> >   
> 
> 
> Well, having done quite a lot of stuff with Proteus (v5.2) I can say 
> that I've never encountered a limitation that can't be worked around 
> without too much fuss.  I will say that the auto-placement and 
> auto-routing is pretty rubbish (can't speak for later versions or for 
> Electra), but I much prefer to do all this by hand anyway.
> 
> One feature I really missed (which I believe exists in Protel DXP) is 
> the ability to route a track at an exact spacing from an adjacent track, 
> following all the bends, etc.  This is really useful when you're running 
> a bus of tracks and trying to use the minimum space.  With Proteus 
> (v5.2) you have to watch the mouse coordinate display and manually space 
> the tracks exactly right (again, maybe they improved this by now?).
> 
> Seb
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
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From dalenkarl at yahoo.se  Tue Apr  3 23:10:39 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 3 Apr 2007 23:10:39 +0200 (CEST)
Subject: [sdiy] SSM2164 and *one unit* tempco idea!
In-Reply-To: <20070403.195950.95131249.cfmd@bredband.net>
Message-ID: <637559.7172.qm@web27609.mail.ukl.yahoo.com>

Idea!

In order to compensate for the temp drift in the SSM2164 one usually takes
a tempco, or ntc for each expo,but since here all the expos are on the same
die and therefore (not matched) but at least on the same die close they
would be quite equal in terms of temp drift one could take one tempco/ntc
thermally place it in contact with the top SSM2164 or below (missionary sex
formation) then take the sensed value, scale it to match each expo input and
then simply add this drift coefficient to each expo input.

The idea are instead of having four tempcos (which would be expensive)
you can use one dirt cheap NTC for instance, if the NTC bails the entire 
chip will bail instead of having to figure out which OTA of four or more bails
out in the case of using four NTC's.Also you save components, and PCB
real estate and its cheaper!

Ideas about this idea!

Reg
KD


	
	
		
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From cfmd at bredband.net  Tue Apr  3 23:30:17 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Tue, 03 Apr 2007 23:30:17 +0200 (CEST)
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <46126BFF.5010907@clickbang.com>
References: <46126BFF.5010907@clickbang.com>
Message-ID: <20070403.233017.-51614009.cfmd@bredband.net>

From: mrmike <mrmike at clickbang.com>
Subject: [sdiy] VCO autotune for poly analog modular
Date: Tue, 03 Apr 2007 10:00:15 -0500
Message-ID: <46126BFF.5010907 at clickbang.com>

Mike,

> Yes, I'm insane.
> I'm trying to build a polyphonic analog modular based on five ASM-1s. 
> Think Obie 4 voice, rather than Prophet-5, as a design style.  I would, 
> however, like to be able to set an accurate single voice across all five 
> modules. Basically, all five panels could have their own controls, but a 
> switch on panel one will disable the front panel controls  on panels 2-5 
> and slave them to the controls on panel one.  In this mode,  an autotune 
> function would be useful.  Has anyone ever implemented one of these in a 
> DIY polysynth?
> 
> I was thinking of having the tune function compare VCO freq at a given 
> CV voltage at several points across the 0-5V range for each VCO, then 
> create a lookup table with a compensation map for each VCO.  As each CV 
> for each voice comes in, its corresponding spot in the table is found 
> and the tuning offset voltage is added to the initial CV and then sent 
> to the VCO. Is this a dopey idea?
> 
> Thoughts welcome!

Now I get the ASM-1 question on a separate thread! :-)

Look at the Oberheim OB-8 (service manual on my webpage).

It uses a single Z80 processor, a 14 bit DAC and an Intel 8253 PIC. Two of
the three 16 bit counters is used for the auto-tune feature.

What the logic do is to setup the VCAs for each oscillator such that during
auto-tune it scans through each VCO and listen to the output mix with the
8253. It compares the VCO to the CPU clock, which is a crystal oscillator.
Without checking the details, I beleive that the CPU clock is divided down
to create the counter gate-time and a certain number of oscillator cycles is
measured. It is fairly obvious how to elaborate on that. It is easy to get
sufficient resolution, I know alot about that.

In the other end you need an oscillator model which you need to correct.
The most simplest model is to just have CV offset and scale being corrected.
This is easy enought. You can take just a few samples (two will do) and you
will get both offset and scale errors corrected. A more elaborate scheme would
also do high frequency compensation to handle errors in the high frequency
compensation already there.

Once you have measured your compensation parameters, you use them to offset
and scale your signals.

The cool thing about the OB-8 VCO trimming is that you have two LEDs and those
tell you which way to turn the single trimmer on the VCO. When both LEDs are
on. After that the auto-tuning does the rest.

Unfortunatly this is not done for the VCFs. Sigh.

Hitting the auto-tune on the OB-8 certainly makes things muuuch more in tune.
I even find it "too perfect" for some stuff so I don't turn it or actually
joggles the power-switch to un-tune it (There should be a feature to disable
tuneing!). It is sufficient and not too complex. You should be able to do
something similar.

Build an high-freq tuning support would be nice.

Cheers,
Magnus


From controlvoltage at gmail.com  Wed Apr  4 00:28:22 2007
From: controlvoltage at gmail.com (Amos)
Date: Tue, 3 Apr 2007 18:28:22 -0400
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <20070403.233017.-51614009.cfmd@bredband.net>
References: <46126BFF.5010907@clickbang.com>
	<20070403.233017.-51614009.cfmd@bredband.net>
Message-ID: <908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de@mail.gmail.com>

Yes you can do this.

Possible disadvantages/challenges:  You'll either need (A) a processor
burly enough to interpolate a curve between your sampled note values +
stored offsets, or (B) a LUT containing offset values for every note
at every octave setting of each oscillator in your system.  The former
demands more CPU horsepower than you might otherwise need, and the
latter means a heinously-long calibration routine.

Also, you may need to experiment to find a waveform that is "easy to
count" from the processor's POV.  Not doing this may cause your
routine to time out or hang.

Good luck!

-Amos

On 4/3/07, Magnus Danielson <cfmd at bredband.net> wrote:
> From: mrmike <mrmike at clickbang.com>
> Subject: [sdiy] VCO autotune for poly analog modular
> Date: Tue, 03 Apr 2007 10:00:15 -0500
> Message-ID: <46126BFF.5010907 at clickbang.com>
>
> Mike,
>
> > Yes, I'm insane.
> > I'm trying to build a polyphonic analog modular based on five ASM-1s.
> > Think Obie 4 voice, rather than Prophet-5, as a design style.  I would,
> > however, like to be able to set an accurate single voice across all five
> > modules. Basically, all five panels could have their own controls, but a
> > switch on panel one will disable the front panel controls  on panels 2-5
> > and slave them to the controls on panel one.  In this mode,  an autotune
> > function would be useful.  Has anyone ever implemented one of these in a
> > DIY polysynth?
> >
> > I was thinking of having the tune function compare VCO freq at a given
> > CV voltage at several points across the 0-5V range for each VCO, then
> > create a lookup table with a compensation map for each VCO.  As each CV
> > for each voice comes in, its corresponding spot in the table is found
> > and the tuning offset voltage is added to the initial CV and then sent
> > to the VCO. Is this a dopey idea?
> >
> > Thoughts welcome!
>
> Now I get the ASM-1 question on a separate thread! :-)
>
> Look at the Oberheim OB-8 (service manual on my webpage).
>
> It uses a single Z80 processor, a 14 bit DAC and an Intel 8253 PIC. Two of
> the three 16 bit counters is used for the auto-tune feature.
>
> What the logic do is to setup the VCAs for each oscillator such that during
> auto-tune it scans through each VCO and listen to the output mix with the
> 8253. It compares the VCO to the CPU clock, which is a crystal oscillator.
> Without checking the details, I beleive that the CPU clock is divided down
> to create the counter gate-time and a certain number of oscillator cycles is
> measured. It is fairly obvious how to elaborate on that. It is easy to get
> sufficient resolution, I know alot about that.
>
> In the other end you need an oscillator model which you need to correct.
> The most simplest model is to just have CV offset and scale being corrected.
> This is easy enought. You can take just a few samples (two will do) and you
> will get both offset and scale errors corrected. A more elaborate scheme would
> also do high frequency compensation to handle errors in the high frequency
> compensation already there.
>
> Once you have measured your compensation parameters, you use them to offset
> and scale your signals.
>
> The cool thing about the OB-8 VCO trimming is that you have two LEDs and those
> tell you which way to turn the single trimmer on the VCO. When both LEDs are
> on. After that the auto-tuning does the rest.
>
> Unfortunatly this is not done for the VCFs. Sigh.
>
> Hitting the auto-tune on the OB-8 certainly makes things muuuch more in tune.
> I even find it "too perfect" for some stuff so I don't turn it or actually
> joggles the power-switch to un-tune it (There should be a feature to disable
> tuneing!). It is sufficient and not too complex. You should be able to do
> something similar.
>
> Build an high-freq tuning support would be nice.
>
> Cheers,
> Magnus
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From controlvoltage at gmail.com  Wed Apr  4 00:32:20 2007
From: controlvoltage at gmail.com (Amos)
Date: Tue, 3 Apr 2007 18:32:20 -0400
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de@mail.gmail.com>
References: <46126BFF.5010907@clickbang.com>
	<20070403.233017.-51614009.cfmd@bredband.net>
	<908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de@mail.gmail.com>
Message-ID: <908a4c120704031532y3d742c4cu5fa5c4496bee002@mail.gmail.com>

As an afterthought, I think you should call it the "Sequential
Quintophonic Analog New Timbral Orchestra" or SQuANTO. :-)

On 4/3/07, Amos <controlvoltage at gmail.com> wrote:
> Yes you can do this.
>
> Possible disadvantages/challenges:  You'll either need (A) a processor
> burly enough to interpolate a curve between your sampled note values +
> stored offsets, or (B) a LUT containing offset values for every note
> at every octave setting of each oscillator in your system.  The former
> demands more CPU horsepower than you might otherwise need, and the
> latter means a heinously-long calibration routine.
>
> Also, you may need to experiment to find a waveform that is "easy to
> count" from the processor's POV.  Not doing this may cause your
> routine to time out or hang.
>
> Good luck!
>
> -Amos
>
> On 4/3/07, Magnus Danielson <cfmd at bredband.net> wrote:
> > From: mrmike <mrmike at clickbang.com>
> > Subject: [sdiy] VCO autotune for poly analog modular
> > Date: Tue, 03 Apr 2007 10:00:15 -0500
> > Message-ID: <46126BFF.5010907 at clickbang.com>
> >
> > Mike,
> >
> > > Yes, I'm insane.
> > > I'm trying to build a polyphonic analog modular based on five ASM-1s.
> > > Think Obie 4 voice, rather than Prophet-5, as a design style.  I would,
> > > however, like to be able to set an accurate single voice across all five
> > > modules. Basically, all five panels could have their own controls, but a
> > > switch on panel one will disable the front panel controls  on panels 2-5
> > > and slave them to the controls on panel one.  In this mode,  an autotune
> > > function would be useful.  Has anyone ever implemented one of these in a
> > > DIY polysynth?
> > >
> > > I was thinking of having the tune function compare VCO freq at a given
> > > CV voltage at several points across the 0-5V range for each VCO, then
> > > create a lookup table with a compensation map for each VCO.  As each CV
> > > for each voice comes in, its corresponding spot in the table is found
> > > and the tuning offset voltage is added to the initial CV and then sent
> > > to the VCO. Is this a dopey idea?
> > >
> > > Thoughts welcome!
> >
> > Now I get the ASM-1 question on a separate thread! :-)
> >
> > Look at the Oberheim OB-8 (service manual on my webpage).
> >
> > It uses a single Z80 processor, a 14 bit DAC and an Intel 8253 PIC. Two of
> > the three 16 bit counters is used for the auto-tune feature.
> >
> > What the logic do is to setup the VCAs for each oscillator such that during
> > auto-tune it scans through each VCO and listen to the output mix with the
> > 8253. It compares the VCO to the CPU clock, which is a crystal oscillator.
> > Without checking the details, I beleive that the CPU clock is divided down
> > to create the counter gate-time and a certain number of oscillator cycles is
> > measured. It is fairly obvious how to elaborate on that. It is easy to get
> > sufficient resolution, I know alot about that.
> >
> > In the other end you need an oscillator model which you need to correct.
> > The most simplest model is to just have CV offset and scale being corrected.
> > This is easy enought. You can take just a few samples (two will do) and you
> > will get both offset and scale errors corrected. A more elaborate scheme would
> > also do high frequency compensation to handle errors in the high frequency
> > compensation already there.
> >
> > Once you have measured your compensation parameters, you use them to offset
> > and scale your signals.
> >
> > The cool thing about the OB-8 VCO trimming is that you have two LEDs and those
> > tell you which way to turn the single trimmer on the VCO. When both LEDs are
> > on. After that the auto-tuning does the rest.
> >
> > Unfortunatly this is not done for the VCFs. Sigh.
> >
> > Hitting the auto-tune on the OB-8 certainly makes things muuuch more in tune.
> > I even find it "too perfect" for some stuff so I don't turn it or actually
> > joggles the power-switch to un-tune it (There should be a feature to disable
> > tuneing!). It is sufficient and not too complex. You should be able to do
> > something similar.
> >
> > Build an high-freq tuning support would be nice.
> >
> > Cheers,
> > Magnus
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>


From cfmd at bredband.net  Wed Apr  4 00:59:56 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 04 Apr 2007 00:59:56 +0200 (CEST)
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de@mail.gmail.com>
References: <46126BFF.5010907@clickbang.com>
	<20070403.233017.-51614009.cfmd@bredband.net>
	<908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de@mail.gmail.com>
Message-ID: <20070404.005956.-1610500961.cfmd@bredband.net>

From: Amos <controlvoltage at gmail.com>
Subject: Re: [sdiy] VCO autotune for poly analog modular
Date: Tue, 3 Apr 2007 18:28:22 -0400
Message-ID: <908a4c120704031528p51bfd1f6tc4e9fe6816f1a1de at mail.gmail.com>

> Yes you can do this.
> 
> Possible disadvantages/challenges:  You'll either need (A) a processor
> burly enough to interpolate a curve between your sampled note values +
> stored offsets, or (B) a LUT containing offset values for every note
> at every octave setting of each oscillator in your system.  The former
> demands more CPU horsepower than you might otherwise need, and the
> latter means a heinously-long calibration routine.

A small AVR or PIC is able to do this. They will be twiddeling their little
thumbs while doing it. They are cheap too.

> Also, you may need to experiment to find a waveform that is "easy to
> count" from the processor's POV.  Not doing this may cause your
> routine to time out or hang.

Saw or Squarewave is what you want, toss in a gain-stage (say x100 or so) to
gain the through zero and then a series of CMOS not-gates for final gain
prior to hitting the counter input.

Cheers,
Magnus


From houshu at muj.biglobe.ne.jp  Wed Apr  4 06:31:21 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Wed, 4 Apr 2007 13:31:21 +0900 (JST)
Subject: [sdiy] SSM2164 and *one unit* tempco idea!
Message-ID: <20070404.133121.614880803330663.houshu@muj.biglobe.ne.jp>

Hello KD,

I considered similar idea a couple of years ago, but abandoned. 
(I'was and am thinking of 2164-based synth like Roman Sowa ;-)  
Your approach looks different from mine.  I'd like to know the 
details of your idea.

I tried to design a VCO (without tempco) using one unit in 2164 for 
exponential converter and another for tempco.  The disign was very 
difficult for me because its temperature dependency is not linear.  
After compromise, I managed to draw a schematic.  However, I couldn't 
think it is a better design than ordinary tempco-based method, 
because it is complicated and requires adjustment.

Sam HOSHUYAMA
Saitama, JAPAN


Date: 2007/04/04 06:10:39
karl dalen <dalenkarl at yahoo.se> wrote:
> Idea!
> 
> In order to compensate for the temp drift in the SSM2164 one usually takes
> a tempco, or ntc for each expo,but since here all the expos are on the same
> die and therefore (not matched) but at least on the same die close they
> would be quite equal in terms of temp drift one could take one tempco/ntc
> thermally place it in contact with the top SSM2164 or below (missionary sex
> formation) then take the sensed value, scale it to match each expo input and
> then simply add this drift coefficient to each expo input.
> 
> The idea are instead of having four tempcos (which would be expensive)
> you can use one dirt cheap NTC for instance, if the NTC bails the entire 
> chip will bail instead of having to figure out which OTA of four or more bails
> out in the case of using four NTC's.Also you save components, and PCB
> real estate and its cheaper!
> 
> Ideas about this idea!
> 
> Reg
> KD
> 
> 
> 	
> 	
> 		
> _________________________________________________________
> Flyger tiden iv?? F?ga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F?den p? http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From vjhl2000 at hotmail.com  Wed Apr  4 07:52:21 2007
From: vjhl2000 at hotmail.com (Vesa Lahteenmaki)
Date: Wed, 04 Apr 2007 05:52:21 +0000
Subject: SV: Re: [sdiy] Altrium Designer/Protel       mm versus mils
In-Reply-To: <821605.99804.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <BAY109-F32F7E2AD4FAEED9DFA1A54D5660@phx.gbl>

>From: karl dalen <dalenkarl at yahoo.se>
>
>Speaking of going off grid, how many of you have
>switched into designing PCB's in mm instead of mil??
>
>Yes, there has been a change, all new PCB's shall be
>designed in mm thesedays as they say!
>
>KD

At least the better cad software lets you select which units to work with, 
mm or mils.
So you can work with either one as you please.
Metric units are now gaing more popularity even in old inch countries ( UK, 
US ) because ic packages keep shrinking and are based on the metric system. 
Leg pitch is now often 0.5mm, compare that to the old DIP pitch 2.54 mm ( 
100 mils ).

I remember in very early 90's I had to design a pcb with 0.5mm pitch 256-pin 
QFP. The problem was that we only had Dos version of Cadstar, which used 
mils ( windows version which had mm units wasn't released until 1994 ). Just 
integer mils, no desimals so I just couldn't create the footprint using 
19.685 mils pitch directly. So I had to use values 19,20,20,19,20,20,19... 
etc trying to minimize the error. Those were the good old days :-)

Vesa L?hteenm?ki,
currently busy designing one of the PCBs for Galileo project ( European GSP 
system)

_________________________________________________________________
Windows Live Messenger - kivuttoman viestinn?n puolestapuhuja. 
http://www.communicationevolved.com/fi-fi/



From carsten at analog-monster.de  Wed Apr  4 08:08:52 2007
From: carsten at analog-monster.de (=?iso-8859-1?Q?Carsten_T=F6nsmann?=)
Date: Wed, 4 Apr 2007 08:08:52 +0200
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <000301c7767f$b87889e0$3a79b9d9@ghana>

Hi Rick,

please add my link:

http://www.analog-monster.de/index_en.html

Thanks in advance

Carsten

----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 02, 2007 5:33 PM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From yves.usson at imag.fr  Wed Apr  4 08:50:21 2007
From: yves.usson at imag.fr (yves usson)
Date: Wed, 04 Apr 2007 08:50:21 +0200
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <000301c7767f$b87889e0$3a79b9d9@ghana>
References: <46112259.8020902@xs4all.nl> <000301c7767f$b87889e0$3a79b9d9@ghana>
Message-ID: <46134AAD.1070804@imag.fr>

Hi Rick

You may add a link to my page :
Yves Usson http://yusynth.net

Regards

Yves
> ----- Original Message ----- From: "Rick Jansen" <rick.jansen at xs4all.nl>
> To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, April 02, 2007 5:33 PM
> Subject: [sdiy] List home page, and links to your home pages
> 
> 
>> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
>> some rather ancient and dusty links.
>>
>> Let me know if you want a link [added/removed/changed] there to your own
>> home page, or the page with your synth-diy things.
>> -- 
>> Rick Jansen
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


-- 
Yves Usson


From harrybissell at copper.net  Wed Apr  4 15:38:24 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 4 Apr 2007 13:38:24 -0000
Subject: [sdiy] VCO autotune for poly analog modular
Message-ID: <380-22007434133824216@copper.net>

Should be easy to do by calibrating maybe five
octave spaced points, then use linear interpolation
within those note ranges. The Prophet V worked this way,
and it was quite effective. That was a Z-80 iirc with very
little RAM 

H^) harry
>
>
>---- Original Message ----
>From: controlvoltage at gmail.com
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] VCO autotune for poly analog modular
>Date: Tue, 3 Apr 2007 18:28:22 -0400
>
>>Yes you can do this.
>>
>>Possible disadvantages/challenges:  You'll either need (A) a
>processor
>>burly enough to interpolate a curve between your sampled note values
>+
>>stored offsets, or (B) a LUT containing offset values for every note
>>at every octave setting of each oscillator in your system.  The
>former
>>demands more CPU horsepower than you might otherwise need, and the
>>latter means a heinously-long calibration routine.
>>
>>Also, you may need to experiment to find a waveform that is "easy to
>>count" from the processor's POV.  Not doing this may cause your
>>routine to time out or hang.
>>
>>Good luck!
>>
>>-Amos
>>
>>On 4/3/07, Magnus Danielson <cfmd at bredband.net> wrote:
>>> From: mrmike <mrmike at clickbang.com>
>>> Subject: [sdiy] VCO autotune for poly analog modular
>>> Date: Tue, 03 Apr 2007 10:00:15 -0500
>>> Message-ID: <46126BFF.5010907 at clickbang.com>
>>>
>>> Mike,
>>>
>>> > Yes, I'm insane.
>>> > I'm trying to build a polyphonic analog modular based on five
>ASM-1s.
>>> > Think Obie 4 voice, rather than Prophet-5, as a design style.  I
>would,
>>> > however, like to be able to set an accurate single voice across
>all five
>>> > modules. Basically, all five panels could have their own
>controls, but a
>>> > switch on panel one will disable the front panel controls  on
>panels 2-5
>>> > and slave them to the controls on panel one.  In this mode,  an
>autotune
>>> > function would be useful.  Has anyone ever implemented one of
>these in a
>>> > DIY polysynth?
>>> >
>>> > I was thinking of having the tune function compare VCO freq at a
>given
>>> > CV voltage at several points across the 0-5V range for each VCO,
>then
>>> > create a lookup table with a compensation map for each VCO.  As
>each CV
>>> > for each voice comes in, its corresponding spot in the table is
>found
>>> > and the tuning offset voltage is added to the initial CV and
>then sent
>>> > to the VCO. Is this a dopey idea?
>>> >
>>> > Thoughts welcome!
>>>
>>> Now I get the ASM-1 question on a separate thread! :-)
>>>
>>> Look at the Oberheim OB-8 (service manual on my webpage).
>>>
>>> It uses a single Z80 processor, a 14 bit DAC and an Intel 8253
>PIC. Two of
>>> the three 16 bit counters is used for the auto-tune feature.
>>>
>>> What the logic do is to setup the VCAs for each oscillator such
>that during
>>> auto-tune it scans through each VCO and listen to the output mix
>with the
>>> 8253. It compares the VCO to the CPU clock, which is a crystal
>oscillator.
>>> Without checking the details, I beleive that the CPU clock is
>divided down
>>> to create the counter gate-time and a certain number of oscillator
>cycles is
>>> measured. It is fairly obvious how to elaborate on that. It is
>easy to get
>>> sufficient resolution, I know alot about that.
>>>
>>> In the other end you need an oscillator model which you need to
>correct.
>>> The most simplest model is to just have CV offset and scale being
>corrected.
>>> This is easy enought. You can take just a few samples (two will
>do) and you
>>> will get both offset and scale errors corrected. A more elaborate
>scheme would
>>> also do high frequency compensation to handle errors in the high
>frequency
>>> compensation already there.
>>>
>>> Once you have measured your compensation parameters, you use them
>to offset
>>> and scale your signals.
>>>
>>> The cool thing about the OB-8 VCO trimming is that you have two
>LEDs and those
>>> tell you which way to turn the single trimmer on the VCO. When
>both LEDs are
>>> on. After that the auto-tuning does the rest.
>>>
>>> Unfortunatly this is not done for the VCFs. Sigh.
>>>
>>> Hitting the auto-tune on the OB-8 certainly makes things muuuch
>more in tune.
>>> I even find it "too perfect" for some stuff so I don't turn it or
>actually
>>> joggles the power-switch to un-tune it (There should be a feature
>to disable
>>> tuneing!). It is sufficient and not too complex. You should be
>able to do
>>> something similar.
>>>
>>> Build an high-freq tuning support would be nice.
>>>
>>> Cheers,
>>> Magnus
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From dalenkarl at yahoo.se  Wed Apr  4 15:55:41 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Wed, 4 Apr 2007 15:55:41 +0200 (CEST)
Subject: SV: RE: SV: Re: [sdiy] Altrium Designer/Protel       mm versus mils
In-Reply-To: <BAY109-F32F7E2AD4FAEED9DFA1A54D5660@phx.gbl>
Message-ID: <88506.65106.qm@web27602.mail.ukl.yahoo.com>


--- Vesa Lahteenmaki <vjhl2000 at hotmail.com> skrev:

> >From: karl dalen <dalenkarl at yahoo.se>
> >
> >Speaking of going off grid, how many of you have
> >switched into designing PCB's in mm instead of mil??
> >
> >Yes, there has been a change, all new PCB's shall be
> >designed in mm thesedays as they say!
> >
> >KD
> 
> At least the better cad software lets you select which units to work with, 
> mm or mils.
> So you can work with either one as you please.

Thats exactly what i pooke at, namely you dont work with either one
there has been a ""change"" and you are obliged to design in mm not as
you please, the please days are over, i dont say this **they** say so!


> Metric units are now gaing more popularity even in old inch countries ( UK, 
> US ) because ic packages keep shrinking and are based on the metric system. 
> Leg pitch is now often 0.5mm, compare that to the old DIP pitch 2.54 mm ( 
> 100 mils ).

Thats not the point, the point are, **they say so** they say you must
design in mm and not in mil.

Dont ask me for whom *they* are, i assume *they* are the higfly people
in the PCB industry but i dont know for shure, just that *they say so*
and there is no choise no more.

Personally o dont care much, i do front panels in mm and boards in mil
just out of old habits.

KD 


	
	
		
_________________________________________________________
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From dalenkarl at yahoo.se  Wed Apr  4 16:07:32 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Wed, 4 Apr 2007 16:07:32 +0200 (CEST)
Subject: SV: Re: [sdiy] SSM2164 and *one unit* tempco idea!
In-Reply-To: <20070404.133121.614880803330663.houshu@muj.biglobe.ne.jp>
Message-ID: <978844.13324.qm@web27609.mail.ukl.yahoo.com>

Sam!

I remember Roman was talking about temp compensation
when he did his SSM2164 VCO but didnt go futher since
he was pleased with the performance anyway.

I have been dealing with this idea for years but never
gotten my thumbs out to actually do something, but now
i think i at least have a try at it!

Do you have a schematic then i could compare my idea
with your to se what differs then report back to you
if i find anything that differs?

I think in your non tempco compensation idea you got 
a multiplikation factor thats not constant and you 
recognized it as non linearity as you did,it would
come from both internal expo trannies you are using
in your VCO.

Reg
KD



--- HOSHUYAMA <houshu at muj.biglobe.ne.jp> skrev:

> Hello KD,
> 
> I considered similar idea a couple of years ago, but abandoned. 
> (I'was and am thinking of 2164-based synth like Roman Sowa ;-)  
> Your approach looks different from mine.  I'd like to know the 
> details of your idea.
> 
> I tried to design a VCO (without tempco) using one unit in 2164 for 
> exponential converter and another for tempco.  The disign was very 
> difficult for me because its temperature dependency is not linear.  
> After compromise, I managed to draw a schematic.  However, I couldn't 
> think it is a better design than ordinary tempco-based method, 
> because it is complicated and requires adjustment.
> 
> Sam HOSHUYAMA
> Saitama, JAPAN
> 
> 
> Date: 2007/04/04 06:10:39
> karl dalen <dalenkarl at yahoo.se> wrote:
> > Idea!
> > 
> > In order to compensate for the temp drift in the SSM2164 one usually takes
> > a tempco, or ntc for each expo,but since here all the expos are on the same
> > die and therefore (not matched) but at least on the same die close they
> > would be quite equal in terms of temp drift one could take one tempco/ntc
> > thermally place it in contact with the top SSM2164 or below (missionary sex
> > formation) then take the sensed value, scale it to match each expo input
> and
> > then simply add this drift coefficient to each expo input.
> > 
> > The idea are instead of having four tempcos (which would be expensive)
> > you can use one dirt cheap NTC for instance, if the NTC bails the entire 
> > chip will bail instead of having to figure out which OTA of four or more
> bails
> > out in the case of using four NTC's.Also you save components, and PCB
> > real estate and its cheaper!
> > 
> > Ideas about this idea!
> > 
> > Reg
> > KD
> > 
> > 
> > 	
> > 	
> > 		
> > _________________________________________________________
> > Flyger tiden iv??? F??ga dagen med Yahoo! Mails inbyggda
> > kalender. Dessutom 250 MB gratis, virusscanning och antispam. F??den p??
> http://se.mail.yahoo.com
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
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From tom at electricdruid.net  Wed Apr  4 16:27:40 2007
From: tom at electricdruid.net (Tom Wiltshire)
Date: Wed, 4 Apr 2007 15:27:40 +0100
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <380-22007434133824216@copper.net>
References: <380-22007434133824216@copper.net>
Message-ID: <758F5585-1BDC-4234-AF0F-E34B6A2B1A29@electricdruid.net>


On 4 Apr 2007, at 14:38, harrybissell at copper.net wrote:

> Should be easy to do by calibrating maybe five
> octave spaced points, then use linear interpolation
> within those note ranges. The Prophet V worked this way,
> and it was quite effective. That was a Z-80 iirc with very
> little RAM
>
> H^) harry

I second that. As others have said, you'd easily manage to do this  
with a modern uP. Storing a selection of points (octaves are an  
obvious choice, but you could go to half or quarter-octaves) and  
doing linear interpolation between them isn't too demanding. To make  
life easier, you could make sure the chip you use has a hardware  
multiply, since you'll need to multiply for the interpolation.






From controlvoltage at gmail.com  Wed Apr  4 17:22:09 2007
From: controlvoltage at gmail.com (Amos)
Date: Wed, 4 Apr 2007 11:22:09 -0400
Subject: [sdiy] VA vs. RA: Square wave
Message-ID: <908a4c120704040822w4d5ca94bk7ad105ec68a83b1@mail.gmail.com>

Hello all,

I have noticed in some analogue oscillators squarewave output, that
there is an unchanging time constant governing the loss of voltage
from the "high" state of the oscillator, such that at low frequencies
you actually see a gentle ramp downward in voltage from the start of
the cycle until the next reset, instead of a perfect square.  Since
this ramp downwards is not frequency-dependent (or not so much), at
high frequencies the same oscillator puts out a more perfect square
wave.

Is this subtlety simulated in any virtual analogues, or do they tend
to output a perfect square wave the same shape at all frequencies?  I
am sure it would make a timbral difference.

Cheers,

Amos


From james at 4thharmonic.com  Wed Apr  4 17:27:18 2007
From: james at 4thharmonic.com (James Dunn)
Date: Wed, 04 Apr 2007 16:27:18 +0100
Subject: [sdiy] TDA7052
Message-ID: <4613C3D6.8080606@4thharmonic.com>

Hi,

I've been playing around with a circuit for the HT8950 voice modulator 
chip, using a TDA7052 as an output amp. Basically, I've been playing 
around with feedback with a miniature mic and small speaker, and I've 
fried the TDA7052! I've built the circuit as shown on the datasheet with 
a 4.7k resistor to ground on the input and supply decoupling... how can 
I use this with feedback without frying the chip? Something like a 
current limiting resistor on the input? I also had a line out jack 
connected to the same output! :) Perhaps this wasn't a good idea... I do 
need a line out too though..

any suggestions?

James


From controlvoltage at gmail.com  Wed Apr  4 17:31:46 2007
From: controlvoltage at gmail.com (Amos)
Date: Wed, 4 Apr 2007 11:31:46 -0400
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <758F5585-1BDC-4234-AF0F-E34B6A2B1A29@electricdruid.net>
References: <380-22007434133824216@copper.net>
	<758F5585-1BDC-4234-AF0F-E34B6A2B1A29@electricdruid.net>
Message-ID: <908a4c120704040831w7dc03a51m32d2f35ff8bb390c@mail.gmail.com>

On 4/4/07, Tom Wiltshire <tom at electricdruid.net> wrote:
> To make life easier, you could make sure the chip you use
has a hardware
> multiply, since you'll need to multiply for the interpolation.

This was more my point in originally referring to a "burlier" uP;
not meaning to imply that the task itself would be daunting for modern
technology. :-)

Cheers!

-Amos


From harrybissell at copper.net  Wed Apr  4 17:38:09 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 4 Apr 2007 15:38:09 -0000
Subject: [sdiy] VA vs. RA: Square wave
Message-ID: <380-2200743415389158@copper.net>

You are probably seeing the result of a series
capacitor used to remove DC offset from the
square wave.  The higher the frequency of the
wave, the less noticible this effect will be.

In most Analog VCO the square wave is DC coupled
so that it can be a modulation source. The "DC
blocking" cap is often at the VCF or VCA module.

Its possible to sum a Pulse wave with the PWM
input to remove the overall effect of DC offset,
the overall effect can be bizarre if you allow the
pulse to cut off completely.

The VA might be trying to simulate 'real world'
VCO waves

H^) harry



>
>
>---- Original Message ----
>From: controlvoltage at gmail.com
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] VA vs. RA: Square wave
>Date: Wed, 4 Apr 2007 11:22:09 -0400
>
>>Hello all,
>>
>>I have noticed in some analogue oscillators squarewave output, that
>>there is an unchanging time constant governing the loss of voltage
>>from the "high" state of the oscillator, such that at low
>frequencies
>>you actually see a gentle ramp downward in voltage from the start of
>>the cycle until the next reset, instead of a perfect square.  Since
>>this ramp downwards is not frequency-dependent (or not so much), at
>>high frequencies the same oscillator puts out a more perfect square
>>wave.
>>
>>Is this subtlety simulated in any virtual analogues, or do they tend
>>to output a perfect square wave the same shape at all frequencies? 
>I
>>am sure it would make a timbral difference.
>>
>>Cheers,
>>
>>Amos
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From synth1 at airmail.net  Wed Apr  4 17:38:55 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Wed, 4 Apr 2007 10:38:55 -0500
Subject: [sdiy] VA vs. RA: Square wave
References: <908a4c120704040822w4d5ca94bk7ad105ec68a83b1@mail.gmail.com>
Message-ID: <007e01c776cf$5c85d110$7800a8c0@bilbo>

> I have noticed in some analogue oscillators squarewave output, that
> there is an unchanging time constant governing the loss of voltage
> from the "high" state of the oscillator, such that at low frequencies
> you actually see a gentle ramp downward in voltage from the start of
> the cycle until the next reset, instead of a perfect square.  Since
> this ramp downwards is not frequency-dependent (or not so much), at
> high frequencies the same oscillator puts out a more perfect square
> wave.

The VCOs are not doing this. It's a function of inter-stage AC coupling.

The caps (and the associated input impedance) create a quasi-BP filter (mostly 
HP). In order not to see this on a scope, the cutoff needs to be about 5 times 
below the lowest frequency. This can lead to rather large caps (over 100uf) 
which are physically large and expensive. So, a good compromise is to use 10uf 
caps (they need to be non-polar). Assuming a 33K input impedance for an audio 
summer, that gives a ~0.5HZ cutoff so anything above say 30Hz would not exhibit 
much "tilt".

Where you really start to notice it is when you use a AC coupling cap of say 
0.47uf or below.

For a VA, this can be accounted for by either tilting the VCO output itself 
(*all* waveforms are effected, it's just easier to see it with a square) or a 
simple IIR filter to emulate the coupling effects.

Paul S.



From controlvoltage at gmail.com  Wed Apr  4 18:19:40 2007
From: controlvoltage at gmail.com (Amos)
Date: Wed, 4 Apr 2007 12:19:40 -0400
Subject: [sdiy] VA vs. RA: Square wave
In-Reply-To: <007e01c776cf$5c85d110$7800a8c0@bilbo>
References: <908a4c120704040822w4d5ca94bk7ad105ec68a83b1@mail.gmail.com>
	<007e01c776cf$5c85d110$7800a8c0@bilbo>
Message-ID: <908a4c120704040919g78eba40awdf4ccf4bd467de1c@mail.gmail.com>

Hi Paul,

Thanks for your clear explanation!  I appreciate your insight.

In other news, have you had a chance to ship Matthew's x0xb0x?

Many thanks,

Amos

On 4/4/07, Paul Schreiber <synth1 at airmail.net> wrote:
> > I have noticed in some analogue oscillators squarewave output, that
> > there is an unchanging time constant governing the loss of voltage
> > from the "high" state of the oscillator, such that at low frequencies
> > you actually see a gentle ramp downward in voltage from the start of
> > the cycle until the next reset, instead of a perfect square.  Since
> > this ramp downwards is not frequency-dependent (or not so much), at
> > high frequencies the same oscillator puts out a more perfect square
> > wave.
>
> The VCOs are not doing this. It's a function of inter-stage AC coupling.
>
> The caps (and the associated input impedance) create a quasi-BP filter (mostly
> HP). In order not to see this on a scope, the cutoff needs to be about 5 times
> below the lowest frequency. This can lead to rather large caps (over 100uf)
> which are physically large and expensive. So, a good compromise is to use 10uf
> caps (they need to be non-polar). Assuming a 33K input impedance for an audio
> summer, that gives a ~0.5HZ cutoff so anything above say 30Hz would not exhibit
> much "tilt".
>
> Where you really start to notice it is when you use a AC coupling cap of say
> 0.47uf or below.
>
> For a VA, this can be accounted for by either tilting the VCO output itself
> (*all* waveforms are effected, it's just easier to see it with a square) or a
> simple IIR filter to emulate the coupling effects.
>
> Paul S.
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From syntheticdan at gmail.com  Wed Apr  4 18:51:39 2007
From: syntheticdan at gmail.com (Danjel van Tijn)
Date: Wed, 4 Apr 2007 09:51:39 -0700
Subject: [sdiy] broken oberheim matrix 6r
Message-ID: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>

Hi Guys,

I tried to send this out a while ago but the list was onbiously down.
I recently took a gamble to buy a broken Oberheim matrix 6r.
The unit turns on, receives midi but no sound out. I thought it might
be a problem with corrupt memory data but no amounts of resets or self
callibration have worked (nor has re-programming voices from a PC).
When I run callibration I get the following errors:
Bad Wave 63
Bad Res 63
Bad VcF 63
which basically means that all the voice chips are failing the callibration.

I have tried re-seating all connectors, cleaning the pins of the
cem3396 chips (in case of oxidation), I checked all power rails and
have tried to trace through signals with a scope.
It looks like the CEM3396 chips are receiving the appropriae
corresponding signal changes (e.g. if I edit a parameter I see changes
at the inputs of a voice chip). However, the refference signal to the
chip is very very low amplitude and saw haped. Also I get no audio out
of the voice chips.

What are the chances that all 6 voice chips spontaneously died? I have
ordered a sigle replacement chip to see if that makes a difference for
a single voice.

Any other clues as to what may be wrong???

thanks!
Danjel

-- 
www.intellijel.com
www.myspace.com/intellijel


From mverbos at earthlink.net  Wed Apr  4 19:45:25 2007
From: mverbos at earthlink.net (mark verbos)
Date: Wed, 4 Apr 2007 13:45:25 -0400
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <000301c7767f$b87889e0$3a79b9d9@ghana>
References: <46112259.8020902@xs4all.nl> <000301c7767f$b87889e0$3a79b9d9@ghana>
Message-ID: <B2396F78-5C1A-4A6D-B7DB-7CB807927F4E@earthlink.net>

>

www.simple-answer.com/DIY.html


> ----- Original Message ----- From: "Rick Jansen"  
> <rick.jansen at xs4all.nl>
> To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, April 02, 2007 5:33 PM
> Subject: [sdiy] List home page, and links to your home pages
>
>
>> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/ 
>> > with
>> some rather ancient and dusty links.
>> Let me know if you want a link [added/removed/changed] there to  
>> your own
>> home page, or the page with your synth-diy things.
>> -- 
>> Rick Jansen
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From dalenkarl at yahoo.se  Wed Apr  4 21:18:23 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Wed, 4 Apr 2007 21:18:23 +0200 (CEST)
Subject: SV: [sdiy] broken oberheim matrix 6r
In-Reply-To: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>
Message-ID: <230605.19626.qm@web27604.mail.ukl.yahoo.com>

Have you checked the 8253 timer?

If these dont work you wont get any sound!

KD

 for the  os
--- Danjel van Tijn <syntheticdan at gmail.com> skrev:

> Hi Guys,
> 
> I tried to send this out a while ago but the list was onbiously down.
> I recently took a gamble to buy a broken Oberheim matrix 6r.
> The unit turns on, receives midi but no sound out. I thought it might
> be a problem with corrupt memory data but no amounts of resets or self
> callibration have worked (nor has re-programming voices from a PC).
> When I run callibration I get the following errors:
> Bad Wave 63
> Bad Res 63
> Bad VcF 63
> which basically means that all the voice chips are failing the callibration.
> 
> I have tried re-seating all connectors, cleaning the pins of the
> cem3396 chips (in case of oxidation), I checked all power rails and
> have tried to trace through signals with a scope.
> It looks like the CEM3396 chips are receiving the appropriae
> corresponding signal changes (e.g. if I edit a parameter I see changes
> at the inputs of a voice chip). However, the refference signal to the
> chip is very very low amplitude and saw haped. Also I get no audio out
> of the voice chips.
> 
> What are the chances that all 6 voice chips spontaneously died? I have
> ordered a sigle replacement chip to see if that makes a difference for
> a single voice.
> 
> Any other clues as to what may be wrong???
> 
> thanks!
> Danjel
> 
> -- 
> www.intellijel.com
> www.myspace.com/intellijel
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
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From syntheticdan at gmail.com  Wed Apr  4 21:46:31 2007
From: syntheticdan at gmail.com (Danjel van Tijn)
Date: Wed, 4 Apr 2007 12:46:31 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <230605.19626.qm@web27604.mail.ukl.yahoo.com>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>
	<230605.19626.qm@web27604.mail.ukl.yahoo.com>
Message-ID: <fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>

Hi karl,

Does the 8253 timer commonly fail? I will definitely check it out...

thanks for the tip!

Danjel

On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
> Have you checked the 8253 timer?
>
> If these dont work you wont get any sound!
>
> KD
>
>  for the  os
> --- Danjel van Tijn <syntheticdan at gmail.com> skrev:
>
> > Hi Guys,
> >
> > I tried to send this out a while ago but the list was onbiously down.
> > I recently took a gamble to buy a broken Oberheim matrix 6r.
> > The unit turns on, receives midi but no sound out. I thought it might
> > be a problem with corrupt memory data but no amounts of resets or self
> > callibration have worked (nor has re-programming voices from a PC).
> > When I run callibration I get the following errors:
> > Bad Wave 63
> > Bad Res 63
> > Bad VcF 63
> > which basically means that all the voice chips are failing the callibration.
> >
> > I have tried re-seating all connectors, cleaning the pins of the
> > cem3396 chips (in case of oxidation), I checked all power rails and
> > have tried to trace through signals with a scope.
> > It looks like the CEM3396 chips are receiving the appropriae
> > corresponding signal changes (e.g. if I edit a parameter I see changes
> > at the inputs of a voice chip). However, the refference signal to the
> > chip is very very low amplitude and saw haped. Also I get no audio out
> > of the voice chips.
> >
> > What are the chances that all 6 voice chips spontaneously died? I have
> > ordered a sigle replacement chip to see if that makes a difference for
> > a single voice.
> >
> > Any other clues as to what may be wrong???
> >
> > thanks!
> > Danjel
> >
> > --
> > www.intellijel.com
> > www.myspace.com/intellijel
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
>
>
>
>
>
> _________________________________________________________
> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
www.intellijel.com
www.myspace.com/intellijel



From cfmd at bredband.net  Wed Apr  4 22:59:29 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 04 Apr 2007 22:59:29 +0200 (CEST)
Subject: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <758F5585-1BDC-4234-AF0F-E34B6A2B1A29@electricdruid.net>
References: <380-22007434133824216@copper.net>
	<758F5585-1BDC-4234-AF0F-E34B6A2B1A29@electricdruid.net>
Message-ID: <20070404.225929.-401048395.cfmd@bredband.net>

From: Tom Wiltshire <tom at electricdruid.net>
Subject: Re: [sdiy] VCO autotune for poly analog modular
Date: Wed, 4 Apr 2007 15:27:40 +0100
Message-ID: <758F5585-1BDC-4234-AF0F-E34B6A2B1A29 at electricdruid.net>

> 
> On 4 Apr 2007, at 14:38, harrybissell at copper.net wrote:
> 
> > Should be easy to do by calibrating maybe five
> > octave spaced points, then use linear interpolation
> > within those note ranges. The Prophet V worked this way,
> > and it was quite effective. That was a Z-80 iirc with very
> > little RAM
> >
> > H^) harry
> 
> I second that. As others have said, you'd easily manage to do this  
> with a modern uP. Storing a selection of points (octaves are an  
> obvious choice, but you could go to half or quarter-octaves) and  
> doing linear interpolation between them isn't too demanding. To make  
> life easier, you could make sure the chip you use has a hardware  
> multiply, since you'll need to multiply for the interpolation.

The trick is to make a calibration method in which the correction is cheap
and where the calibration may take a few seconds but you generate the
calibration data that makes the correction cheap. You do corrections much more
often than calibration.

Cheers,
Magnus


From keithw at cix.compulink.co.uk  Thu Apr  5 01:29:00 2007
From: keithw at cix.compulink.co.uk (Keith Winstanley)
Date: Thu, 5 Apr 2007 00:29 +0100 (BST)
Subject: [sdiy] List home page, and links to your home pages
Message-ID: <memo.154978@cix.compulink.co.uk>

In-Reply-To: <46112259.8020902 at xs4all.nl>
me please, got some fairly unique stuff on there
:o)

Keith

http://home.freeuk.net/lowpass



From dalenkarl at yahoo.se  Thu Apr  5 02:03:54 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 5 Apr 2007 02:03:54 +0200 (CEST)
Subject: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <20070404.225929.-401048395.cfmd@bredband.net>
Message-ID: <624586.45958.qm@web27602.mail.ukl.yahoo.com>

Use linear VCO no tuning!

KD


--- Magnus Danielson <cfmd at bredband.net> skrev:

> From: Tom Wiltshire <tom at electricdruid.net>
> Subject: Re: [sdiy] VCO autotune for poly analog modular
> Date: Wed, 4 Apr 2007 15:27:40 +0100
> Message-ID: <758F5585-1BDC-4234-AF0F-E34B6A2B1A29 at electricdruid.net>
> 
> > 
> > On 4 Apr 2007, at 14:38, harrybissell at copper.net wrote:
> > 
> > > Should be easy to do by calibrating maybe five
> > > octave spaced points, then use linear interpolation
> > > within those note ranges. The Prophet V worked this way,
> > > and it was quite effective. That was a Z-80 iirc with very
> > > little RAM
> > >
> > > H^) harry
> > 
> > I second that. As others have said, you'd easily manage to do this  
> > with a modern uP. Storing a selection of points (octaves are an  
> > obvious choice, but you could go to half or quarter-octaves) and  
> > doing linear interpolation between them isn't too demanding. To make  
> > life easier, you could make sure the chip you use has a hardware  
> > multiply, since you'll need to multiply for the interpolation.
> 
> The trick is to make a calibration method in which the correction is cheap
> and where the calibration may take a few seconds but you generate the
> calibration data that makes the correction cheap. You do corrections much
> more
> often than calibration.
> 
> Cheers,
> Magnus
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
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From ajhuovil at cc.hut.fi  Thu Apr  5 02:16:26 2007
From: ajhuovil at cc.hut.fi (Antti Huovilainen)
Date: Thu, 5 Apr 2007 03:16:26 +0300 (EEST)
Subject: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <624586.45958.qm@web27602.mail.ukl.yahoo.com>
References: <624586.45958.qm@web27602.mail.ukl.yahoo.com>
Message-ID: <Pine.GSO.4.64.0704050313310.12289@vipunen.hut.fi>

On Thu, 5 Apr 2007, karl dalen wrote:

> Use linear VCO no tuning!

Nah, use linear VCOs under microprocessor control. No manual tuning, no 
trimming, no drift. All you need is a non ancient MCU (AVR, ARM, basically 
anything that was invented after early 80s) and a high resolution DAC (but 
not high accuracy, DC and gain error can be huge without problems).

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova


From dougt55 at yahoo.com  Thu Apr  5 02:32:13 2007
From: dougt55 at yahoo.com (Doug Terrebonne)
Date: Wed, 4 Apr 2007 17:32:13 -0700 (PDT)
Subject: [sdiy] List home page, and links to your home pages
In-Reply-To: <B2396F78-5C1A-4A6D-B7DB-7CB807927F4E@earthlink.net>
Message-ID: <120459.18985.qm@web81205.mail.mud.yahoo.com>

http://www.synthparts.com

Thanks,
Doug
> > ----- Original Message ----- From: "Rick Jansen"  
> > <rick.jansen at xs4all.nl>
> > To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
> > Sent: Monday, April 02, 2007 5:33 PM
> > Subject: [sdiy] List home page, and links to your home pages
> >
> >
> >> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/
> 
> >> > with
> >> some rather ancient and dusty links.
> >> Let me know if you want a link [added/removed/changed] there to  
> >> your own
> >> home page, or the page with your synth-diy things.
> >> -- 
> >> Rick Jansen
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From davebr at earthlink.net  Thu Apr  5 03:53:26 2007
From: davebr at earthlink.net (David Brown)
Date: Wed, 04 Apr 2007 18:53:26 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.co m>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>
	<230605.19626.qm@web27604.mail.ukl.yahoo.com>
	<fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
Message-ID: <0JG000IHW590QUP0@vms040.mailsrvcs.net>

I had an 8253 fail in my Matrix-1000 which is basically the same 
circuit design.  Two data pins shorted together with ~100 
ohms.  Totally screwed up the processor.  I had to shotgun cutting 
data lines to figure out where the short was.  The good news is that 
the 8253 is cheap and available but a bear to replace.  I ended up 
cutting off all the pins and removing each pin individually with a 
solder sucker.

Dave

At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
>Hi karl,
>
>Does the 8253 timer commonly fail? I will definitely check it out...
>
>thanks for the tip!
>
>Danjel
>
>On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
>>Have you checked the 8253 timer?
>>
>>If these dont work you wont get any sound!
>>
>>KD



From music.maker at gte.net  Thu Apr  5 04:18:51 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Wed, 04 Apr 2007 19:18:51 -0700
Subject: [sdiy] GateMan I MIDI FPGA Monosynth Posted
Message-ID: <200704050218.l352IpX9009809@linux7.lan>

GateMan I is an FPGA based digital monosynth.  It is ready to run with
minimal additional hardware (described in the project) using a Xilinx
Spartan-3E Starter Kit eval board.  4 NCOs, 1 NCF, 2 ADSRs.  Please see the
Wiki article for more details.

http://www.fpga.synth.net/pmwiki/pmwiki.php?n=FPGASynth.GateManI


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From dlmanley at sonic.net  Thu Apr  5 04:45:49 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Wed, 04 Apr 2007 19:45:49 -0700
Subject: [sdiy] GateMan I MIDI FPGA Monosynth Posted
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <461462DD.7040008@sonic.net>

Scott Gravenhorst wrote:
> GateMan I is an FPGA based digital monosynth.  It is ready to run with
> minimal additional hardware (described in the project) using a Xilinx
> Spartan-3E Starter Kit eval board.  4 NCOs, 1 NCF, 2 ADSRs.  Please see the
> Wiki article for more details.
> 
> http://www.fpga.synth.net/pmwiki/pmwiki.php?n=FPGASynth.GateManI

Well done, Scott!

Thanks for posting this, I look forward to examining it in detail.

-Dave




From ijfritz at comcast.net  Thu Apr  5 05:26:00 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Wed, 04 Apr 2007 21:26:00 -0600
Subject: [sdiy] GateMan I MIDI FPGA Monosynth Posted
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <6.2.1.2.2.20070404212435.020ae830@mail.comcast.net>

At 08:18 PM 4/4/2007, you wrote:
>GateMan I is an FPGA based digital monosynth.  It is ready to run with
>minimal additional hardware (described in the project) using a Xilinx
>Spartan-3E Starter Kit eval board.  4 NCOs, 1 NCF, 2 ADSRs.  Please see the
>Wiki article for more details.


Wow, Scott, amazing work!  Thanks for taking the time to write it up.

   Ian 



From dougt55 at yahoo.com  Thu Apr  5 06:55:04 2007
From: dougt55 at yahoo.com (Doug Terrebonne)
Date: Wed, 4 Apr 2007 21:55:04 -0700 (PDT)
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <46148DF2.9010901@imt.net>
Message-ID: <517769.70408.qm@web81201.mail.mud.yahoo.com>

I also just fixed a Roland MKS-70 where an 8253 failed causing 1 of the
DCOs to be constant pitch...

--- Bob Weigel <sounddoctorin at imt.net> wrote:

> Yeah sometimes that is the best way.  If you are in a real hurry  and
> a 
> board is hard to get out...hehe..you might take sharp nips and cut
> the 
> pins leaving most of it sticking up.  Toss the old chip then flux the
> 
> new ones and pretin.  Flux again then melt each onto the pins
> quickly.  
> If it has to be done..in 10 minutes :)
> 
> I haven't personally seen the chips fail.  But always a possibility. 
> 
> Often several of them are used in some kind of scheme since they have
> 
> limited outputs.  So get the diagram for one and start testing to see
> if 
> all the outputs are doing something reasonable.  There could also be
> two 
> cpu's in those I can't recall.  In the kawai of similar design
> (SX240) a 
> power supply issue took out the cpu, and an old ssm narrow package
> 6116 
> memory chip and possibly another that I replaced before I got there. 
> 
> What a pain that was. But that would allow all the patches to be 
> editable etc. but no sounds of course since that cpu system handled
> the 
> oscillators -Bob
> 
> David Brown wrote:
> 
> > I had an 8253 fail in my Matrix-1000 which is basically the same 
> > circuit design.  Two data pins shorted together with ~100 ohms.  
> > Totally screwed up the processor.  I had to shotgun cutting data
> lines 
> > to figure out where the short was.  The good news is that the 8253
> is 
> > cheap and available but a bear to replace.  I ended up cutting off
> all 
> > the pins and removing each pin individually with a solder sucker.
> >
> > Dave
> >
> > At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
> >
> >> Hi karl,
> >>
> >> Does the 8253 timer commonly fail? I will definitely check it
> out...
> >>
> >> thanks for the tip!
> >>
> >> Danjel
> >>
> >> On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >>
> >>> Have you checked the 8253 timer?
> >>>
> >>> If these dont work you wont get any sound!
> >>>
> >>> KD
> >>
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From syntheticdan at gmail.com  Thu Apr  5 06:58:02 2007
From: syntheticdan at gmail.com (Danjel van Tijn)
Date: Wed, 4 Apr 2007 21:58:02 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <0JG000IHW590QUP0@vms040.mailsrvcs.net>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>
	<230605.19626.qm@web27604.mail.ukl.yahoo.com>
	<fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
	<0JG000IHW590QUP0@vms040.mailsrvcs.net>
Message-ID: <fc3b811d0704042158t56862e4ap7768b42da14afb41@mail.gmail.com>

So how did the two data pins become shorted together?
Seems like these oberheim's are prone to selfdestruction! :p

cheers,
     Danjel


On 4/4/07, David Brown <davebr at earthlink.net> wrote:
> I had an 8253 fail in my Matrix-1000 which is basically the same
> circuit design.  Two data pins shorted together with ~100
> ohms.  Totally screwed up the processor.  I had to shotgun cutting
> data lines to figure out where the short was.  The good news is that
> the 8253 is cheap and available but a bear to replace.  I ended up
> cutting off all the pins and removing each pin individually with a
> solder sucker.
>
> Dave
>
> At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
> >Hi karl,
> >
> >Does the 8253 timer commonly fail? I will definitely check it out...
> >
> >thanks for the tip!
> >
> >Danjel
> >
> >On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >>Have you checked the 8253 timer?
> >>
> >>If these dont work you wont get any sound!
> >>
> >>KD
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
www.intellijel.com
www.myspace.com/intellijel


From sounddoctorin at imt.net  Thu Apr  5 07:30:28 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Wed, 04 Apr 2007 22:30:28 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>	<230605.19626.qm@web27604.mail.ukl.yahoo.com>
	<fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
Message-ID: <46148974.7060708@imt.net>

Firstly, I'm trying to update *that* page as we speak where I detail the 
types of chips or technologies that are used for the various aspects of 
each synth.  The matrix 6 you'll see though from the general page for 
that unit on the www.imt.net/~sounddoctorin/synthtec link... The 
oscillators are digital.  THe 3396 isn't the voice on a chip that has a 
vco. It's got waveform converters designed to be driven by a chip LIKE 
the 8253 which is used in the Kawai DCO synths, some Rolands like MKS30, 
and others.  Those are the oscillators driven by entirely digital stuff 
of course.
Anyway the 3396 also has a mixer, VCF and a VCA which can take a 
waveform converter and FM the VCF with it and two other vca's for eg mod 
and dynamics. The converters are nice with all the options you'd expect 
from Doug at that time :-). 

Ok anyway..so bottom line, if no output it's not those chips anyway 
likely since they don't normally all fail at once.  And I doubt there's 
a possibility of an offset taking out everything.  Usually they put 
enough impedence on the outs so that an offset only takes out the voice 
effected totally.

You checked all supply voltages with a scope right?  You might have bad 
regulation..THe outs are current outputs so you likely won't see much 
signal there.  They drive a current to voltage converter amp at some 
point.  I don't have schemos handy.

But anyway that hopefully helps some -Bob

Danjel van Tijn wrote:

> Hi karl,
>
> Does the 8253 timer commonly fail? I will definitely check it out...
>
> thanks for the tip!
>
> Danjel
>
> On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
>
>> Have you checked the 8253 timer?
>>
>> If these dont work you wont get any sound!
>>
>> KD
>>
>>  for the  os
>> --- Danjel van Tijn <syntheticdan at gmail.com> skrev:
>>
>> > Hi Guys,
>> >
>> > I tried to send this out a while ago but the list was onbiously down.
>> > I recently took a gamble to buy a broken Oberheim matrix 6r.
>> > The unit turns on, receives midi but no sound out. I thought it might
>> > be a problem with corrupt memory data but no amounts of resets or self
>> > callibration have worked (nor has re-programming voices from a PC).
>> > When I run callibration I get the following errors:
>> > Bad Wave 63
>> > Bad Res 63
>> > Bad VcF 63
>> > which basically means that all the voice chips are failing the 
>> callibration.
>> >
>> > I have tried re-seating all connectors, cleaning the pins of the
>> > cem3396 chips (in case of oxidation), I checked all power rails and
>> > have tried to trace through signals with a scope.
>> > It looks like the CEM3396 chips are receiving the appropriae
>> > corresponding signal changes (e.g. if I edit a parameter I see changes
>> > at the inputs of a voice chip). However, the refference signal to the
>> > chip is very very low amplitude and saw haped. Also I get no audio out
>> > of the voice chips.
>> >
>> > What are the chances that all 6 voice chips spontaneously died? I have
>> > ordered a sigle replacement chip to see if that makes a difference for
>> > a single voice.
>> >
>> > Any other clues as to what may be wrong???
>> >
>> > thanks!
>> > Danjel
>> >
>> > --
>> > www.intellijel.com
>> > www.myspace.com/intellijel
>> > _______________________________________________
>> > Synth-diy mailing list
>> > Synth-diy at dropmix.xs4all.nl
>> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>> >
>>
>>
>>
>>
>>
>>
>> _________________________________________________________
>> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
>> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den 
>> p?: http://se.mail.yahoo.com
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
>


From tom at electricdruid.net  Thu Apr  5 07:31:56 2007
From: tom at electricdruid.net (Tom Wiltshire)
Date: Thu, 5 Apr 2007 06:31:56 +0100
Subject: [sdiy] GateMan I MIDI FPGA Monosynth Posted
In-Reply-To: <461462DD.7040008@sonic.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<461462DD.7040008@sonic.net>
Message-ID: <EEDCB25D-7B6F-4138-8286-9549CE033F69@electricdruid.net>


On 5 Apr 2007, at 03:45, Dave Manley wrote:

> Scott Gravenhorst wrote:
>> GateMan I is an FPGA based digital monosynth.  It is ready to run  
>> with
>> minimal additional hardware (described in the project) using a Xilinx
>> Spartan-3E Starter Kit eval board.  4 NCOs, 1 NCF, 2 ADSRs.   
>> Please see the
>> Wiki article for more details.
>> http://www.fpga.synth.net/pmwiki/pmwiki.php?n=FPGASynth.GateManI
>
> Well done, Scott!

Hear hear!

> Thanks for posting this, I look forward to examining it in detail.

Yes, I definitely look forward to getting into this at some point  
soon. You've inspired me to learn about FPGAs.



From davebr at earthlink.net  Thu Apr  5 07:45:29 2007
From: davebr at earthlink.net (David Brown)
Date: Wed, 04 Apr 2007 22:45:29 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <fc3b811d0704042158t56862e4ap7768b42da14afb41@mail.gmail.co m>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>
	<230605.19626.qm@web27604.mail.ukl.yahoo.com>
	<fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
	<0JG000IHW590QUP0@vms040.mailsrvcs.net>
	<fc3b811d0704042158t56862e4ap7768b42da14afb41@mail.gmail.com>
Message-ID: <0JG0009Q9FZRUVT1@vms042.mailsrvcs.net>

Not sure but it was internal to the chip.

I've also seen this with some of the analog muxes in my ARP Avatar 
and an Roland Juno-106.  In the case of the Juno, it had all of the 
symptoms of a bad sound chip but was just in the control circuitry.

At 09:58 PM 4/4/2007, Danjel van Tijn wrote:
>So how did the two data pins become shorted together?
>Seems like these oberheim's are prone to selfdestruction! :p
>
>cheers,
>     Danjel
>
>
>On 4/4/07, David Brown <davebr at earthlink.net> wrote:
>>I had an 8253 fail in my Matrix-1000 which is basically the same
>>circuit design.  Two data pins shorted together with ~100
>>ohms.  Totally screwed up the processor.  I had to shotgun cutting
>>data lines to figure out where the short was.  The good news is that
>>the 8253 is cheap and available but a bear to replace.  I ended up
>>cutting off all the pins and removing each pin individually with a
>>solder sucker.
>>
>>Dave
>>
>>At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
>> >Hi karl,
>> >
>> >Does the 8253 timer commonly fail? I will definitely check it out...
>> >
>> >thanks for the tip!
>> >
>> >Danjel
>> >
>> >On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
>> >>Have you checked the 8253 timer?
>> >>
>> >>If these dont work you wont get any sound!
>> >>
>> >>KD
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
>--
>www.intellijel.com
>www.myspace.com/intellijel
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From sounddoctorin at imt.net  Thu Apr  5 07:49:38 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Wed, 04 Apr 2007 22:49:38 -0700
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <0JG000IHW590QUP0@vms040.mailsrvcs.net>
References: <fc3b811d0704040951q676a51am4049cd7fdf5608a0@mail.gmail.com>	<230605.19626.qm@web27604.mail.ukl.yahoo.com>	<fc3b811d0704041246v5af92ab4pdb6d873c059cbb2d@mail.gmail.com>
	<0JG000IHW590QUP0@vms040.mailsrvcs.net>
Message-ID: <46148DF2.9010901@imt.net>

Yeah sometimes that is the best way.  If you are in a real hurry  and a 
board is hard to get out...hehe..you might take sharp nips and cut the 
pins leaving most of it sticking up.  Toss the old chip then flux the 
new ones and pretin.  Flux again then melt each onto the pins quickly.  
If it has to be done..in 10 minutes :)

I haven't personally seen the chips fail.  But always a possibility.  
Often several of them are used in some kind of scheme since they have 
limited outputs.  So get the diagram for one and start testing to see if 
all the outputs are doing something reasonable.  There could also be two 
cpu's in those I can't recall.  In the kawai of similar design (SX240) a 
power supply issue took out the cpu, and an old ssm narrow package 6116 
memory chip and possibly another that I replaced before I got there.  
What a pain that was. But that would allow all the patches to be 
editable etc. but no sounds of course since that cpu system handled the 
oscillators -Bob

David Brown wrote:

> I had an 8253 fail in my Matrix-1000 which is basically the same 
> circuit design.  Two data pins shorted together with ~100 ohms.  
> Totally screwed up the processor.  I had to shotgun cutting data lines 
> to figure out where the short was.  The good news is that the 8253 is 
> cheap and available but a bear to replace.  I ended up cutting off all 
> the pins and removing each pin individually with a solder sucker.
>
> Dave
>
> At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
>
>> Hi karl,
>>
>> Does the 8253 timer commonly fail? I will definitely check it out...
>>
>> thanks for the tip!
>>
>> Danjel
>>
>> On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
>>
>>> Have you checked the 8253 timer?
>>>
>>> If these dont work you wont get any sound!
>>>
>>> KD
>>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>


From dougt55 at yahoo.com  Thu Apr  5 12:05:26 2007
From: dougt55 at yahoo.com (Doug Terrebonne)
Date: Thu, 5 Apr 2007 03:05:26 -0700 (PDT)
Subject: [sdiy] broken oberheim matrix 6r
In-Reply-To: <46148DF2.9010901@imt.net>
Message-ID: <20070405100526.76472.qmail@web81211.mail.mud.yahoo.com>

No I'm in the SF Bay Area... Just saw it on ebay is all... I have a
fully working 240 so it might be cool to get...


--- Bob Weigel <sounddoctorin at imt.net> wrote:

> Yeah sometimes that is the best way.  If you are in a real hurry  and
> a 
> board is hard to get out...hehe..you might take sharp nips and cut
> the 
> pins leaving most of it sticking up.  Toss the old chip then flux the
> 
> new ones and pretin.  Flux again then melt each onto the pins
> quickly.  
> If it has to be done..in 10 minutes :)
> 
> I haven't personally seen the chips fail.  But always a possibility. 
> 
> Often several of them are used in some kind of scheme since they have
> 
> limited outputs.  So get the diagram for one and start testing to see
> if 
> all the outputs are doing something reasonable.  There could also be
> two 
> cpu's in those I can't recall.  In the kawai of similar design
> (SX240) a 
> power supply issue took out the cpu, and an old ssm narrow package
> 6116 
> memory chip and possibly another that I replaced before I got there. 
> 
> What a pain that was. But that would allow all the patches to be 
> editable etc. but no sounds of course since that cpu system handled
> the 
> oscillators -Bob
> 
> David Brown wrote:
> 
> > I had an 8253 fail in my Matrix-1000 which is basically the same 
> > circuit design.  Two data pins shorted together with ~100 ohms.  
> > Totally screwed up the processor.  I had to shotgun cutting data
> lines 
> > to figure out where the short was.  The good news is that the 8253
> is 
> > cheap and available but a bear to replace.  I ended up cutting off
> all 
> > the pins and removing each pin individually with a solder sucker.
> >
> > Dave
> >
> > At 12:46 PM 4/4/2007, Danjel van Tijn wrote:
> >
> >> Hi karl,
> >>
> >> Does the 8253 timer commonly fail? I will definitely check it
> out...
> >>
> >> thanks for the tip!
> >>
> >> Danjel
> >>
> >> On 4/4/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >>
> >>> Have you checked the 8253 timer?
> >>>
> >>> If these dont work you wont get any sound!
> >>>
> >>> KD
> >>
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From mrmike at clickbang.com  Thu Apr  5 18:13:25 2007
From: mrmike at clickbang.com (mrmike)
Date: Thu, 05 Apr 2007 11:13:25 -0500
Subject: [sdiy] MiniWave EPROMs
Message-ID: <46152025.8010309@clickbang.com>

I finally coughed up the $ for a Balcet Miniwave.  I'd like to try my 
hand at burning my own proms.  Does anyone know if a specific variant of 
the 27C512 eproms is required? Is a 90ns unit fast enough?

Thanks,
mike


From debus at cityweb.de  Thu Apr  5 18:25:28 2007
From: debus at cityweb.de (Ingo Debus)
Date: Thu, 5 Apr 2007 18:25:28 +0200
Subject: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <624586.45958.qm@web27602.mail.ukl.yahoo.com>
References: <624586.45958.qm@web27602.mail.ukl.yahoo.com>
Message-ID: <AE998D87-5F9E-4A6F-9072-116833C440BF@cityweb.de>


Am 05.04.2007 um 02:03 schrieb karl dalen:

> Use linear VCO no tuning!

Guitarist joke?

"No, I don't need to tune my guitar. When I bought it the salesperson  
told me it is already tuned."

Ingo


From scott at tellun.com  Thu Apr  5 18:56:16 2007
From: scott at tellun.com (Scott Juskiw)
Date: Thu, 05 Apr 2007 10:56:16 -0600
Subject: [sdiy] MiniWave EPROMs
In-Reply-To: <46152025.8010309@clickbang.com>
References: <46152025.8010309@clickbang.com>
Message-ID: <p06230906c23ada8bdf0e@[192.168.1.101]>

>I finally coughed up the $ for a Balcet Miniwave.  I'd like to try 
>my hand at burning my own proms.  Does anyone know if a specific 
>variant of the 27C512 eproms is required? Is a 90ns unit fast enough?

I have 100ns chips and they work fine.


From tsheets at saturn5.com  Thu Apr  5 19:19:24 2007
From: tsheets at saturn5.com (tsheets at saturn5.com)
Date: Thu, 5 Apr 2007 10:19:24 -0700
Subject: [sdiy] ASM-1
In-Reply-To: <601091.26998.qm@web32706.mail.mud.yahoo.com>
References: <601091.26998.qm@web32706.mail.mud.yahoo.com>
Message-ID: <20070405171924.GA30890@atari.saturn5.com>


This is a track i did recently that is almost entirely ASM-1, except
for the bass and percussion.

http://www.saturn5.com/tsheets/algo/fall_groove_mix2.mp3

-troy

On Tue, Apr 03, 2007 at 10:23:00AM -0700, bill bigrig wrote:
> Howdy,
> 
>  What is an ASM-1. It sounds interesting.
> Rig
> 
> 
>  
> ____________________________________________________________________________________
> Don't get soaked.  Take a quick peek at the forecast
> with the Yahoo! Search weather shortcut.
> http://tools.search.yahoo.com/shortcuts/#loc_weather
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

-- 
------------------------------------------------------------------------------
tsheets at saturn5.com                                  <- You have found me   
http://www.ferrapsylix.com                           <- sub atomic breakbeat
"I just don't have the discipline to be a hippie"    <- Homer J. Simpson


From ezion67 at gmail.com  Thu Apr  5 22:20:29 2007
From: ezion67 at gmail.com (ezion)
Date: Thu, 5 Apr 2007 22:20:29 +0200
Subject: [sdiy] Re: [sdiy-interim] FLASH/JTAG based DSP?
In-Reply-To: <5.1.0.14.2.20070325110801.03a8ad70@mail.all-electric.com>
References: <JFFHGV$4C35C9F3EEB15803DA93563AE2ED5842@multidominios>
	<000d01c76e63$89c38ba0$6400a8c0@john>
	<5.1.0.14.2.20070325110801.03a8ad70@mail.all-electric.com>
Message-ID: <eed016250704051320u3df0b97dl8bf54eda9ce451be@mail.gmail.com>

Here are two I just learned about: Both AD and Freescale have FLASH
DSPs that look remarkably like uC both in peripheral features as in
price.
Freescale parts listen too DSP56F80x  and MC56F8xxx.
Analog Devices chimes in with ADSP-BF538Fxxxx.
The Freescale stuff goes in the 60 to 80 Mhz lane just like the ARM9.
However the AD Blackfin Flash parts seem to run quite a bit faster,
although from what I read so far you need to copy code to SRAM to go
full throttle?

Think I stick with the ARM9 for a while.
Theo



On 3/25/07, Batz Goodfortune <batzman-nr at all-electric.com> wrote:
> Y-ellow All.
>         Adam and I continued out discussion of the Propeller chip off-list
> given that the list was down. It's probably a bit stale to rekindle that
> thread but it has me wondering.
>
> Is there a DSP that is FLASH based and programmable via JTAG or serial
> port? Basically, a DSP that's as easy to work with as an AVR etc. We've
> never heard of such a thing but that's not to say one doesn't exist. Or
> maybe it's just crap and that's why no-one uses it.
>
> It would help if it were audio-centric and 32 bits wide but even 16 bits
> would be workable. Maybe just an I2C port or some SPI/I2C/serial ports. But
> mainly the ability to program in circuit.
>
> Anything out there?
>
> Thanks in advance.
> Be absolutely Icebox.
>
>  _ __        _    __International Pain-in-the-Ass and prophet of doom__
> | "_ \      | |
> | |_)/  __ _| |_ ____       ALL ELECTRIC KITCHEN
> |  _ \ / _` | __|___ |Your source of Armageddon in a musically crass world
> | |_) | (_| | |_  / /
> |_,__/ \__,_|\__|/ /   Disgusting-> http://all-electric.com
>                 / ,__  Music-> http://all-electric.com/music_downloads.html
> Goodfortune    |_____| Cult  -----> http://www.subgenius.com
>
> _______________________________________________
> This is the interim list for synth-diy at dropmix.xs4all.nl. You are
> getting this email because you have posted to s at d.x.n at least once
> since 2006-01.
> To post, synth-diy at vermine.org
> To unsubscribe, http://vermine.org/cgi-bin/mailman/listinfo/synth-diy
>


From ceme at cox.net  Thu Apr  5 23:19:14 2007
From: ceme at cox.net (ceme at cox.net)
Date: Thu, 5 Apr 2007 16:19:14 -0500
Subject: [sdiy] FS: x0xb0x full kit (New)
Message-ID: <24865608.1175807954392.JavaMail.root@centrmwml06.mgt.cox.net>

For sale - <US only>

Untouched (ie, still in packaging) x0xb0x (#447) full kit as purchased from adafruit last December.

Has USB interface board installed.
Center-detent tuning pot included.
Power adapter included.
All parts, pots, etc as supplied with the kit (which has everything you need).
Stock case and the clear plexi-glass top, too.

Asking $400 (which includes insured priority shipping) - I paid $405 with shipping.

I have only opened the original packaging to check out the stuff.  Everything is untouched.  But everything is there.

I bought this in December '06 and haven't had time to get started on it.  (Another child on the way, so I need a little extra $ and time.)

For payment, I'd like to go money order - unless buyer would like to pay the PayPal fees (not sure what the percentage is at time of writing this).  

Email with any questions.  I can supply pics.

Chris


From eat-it at new.rr.com  Thu Apr  5 23:51:00 2007
From: eat-it at new.rr.com (drew meyer)
Date: Thu, 05 Apr 2007 16:51:00 -0500
Subject: [sdiy] encoder with 1/8" shaft
Message-ID: <46156F44.2000409@new.rr.com>

i've found the perfect knob for a project i'm working on, but it 
requires a rotary encoder with an 1/8" shaft.  does anybody know of any?

thanks,

drew


From jonathan_science at hotmail.com  Fri Apr  6 00:06:08 2007
From: jonathan_science at hotmail.com (J P)
Date: Thu, 05 Apr 2007 18:06:08 -0400
Subject: [sdiy] FS: x0xb0x full kit (New)
In-Reply-To: <24865608.1175807954392.JavaMail.root@centrmwml06.mgt.cox.net>
Message-ID: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>

I'll buy it.  Do you still have it available?

$400.

Jonathan Pratt
Atlanta GA

I can mail a money order this weekend

----Obedience is Pleasure----




>From: <ceme at cox.net>
>Reply-To: synthesizer diy electronics <synth-diy at dropmix.xs4all.nl>
>To: synth-diy at vermine.org, synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] FS: x0xb0x full kit (New)
>Date: Thu, 5 Apr 2007 16:19:14 -0500
>
>For sale - <US only>
>
>Untouched (ie, still in packaging) x0xb0x (#447) full kit as purchased from 
>adafruit last December.
>
>Has USB interface board installed.
>Center-detent tuning pot included.
>Power adapter included.
>All parts, pots, etc as supplied with the kit (which has everything you 
>need).
>Stock case and the clear plexi-glass top, too.
>
>Asking $400 (which includes insured priority shipping) - I paid $405 with 
>shipping.
>
>I have only opened the original packaging to check out the stuff.  
>Everything is untouched.  But everything is there.
>
>I bought this in December '06 and haven't had time to get started on it.  
>(Another child on the way, so I need a little extra $ and time.)
>
>For payment, I'd like to go money order - unless buyer would like to pay 
>the PayPal fees (not sure what the percentage is at time of writing this).
>
>Email with any questions.  I can supply pics.
>
>Chris
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
The average US Credit Score is 675. The cost to see yours: $0 by Experian. 
http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE



From seb at burnit.co.uk  Fri Apr  6 00:23:16 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Thu, 05 Apr 2007 23:23:16 +0100
Subject: [sdiy] Reply to sender not list
In-Reply-To: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
Message-ID: <461576D4.4030206@burnit.co.uk>

Hi Rick,

Any chance we can have the mailman settings set to reply to sender by 
default, not to whole list.  Seem to be a few replies recently that 
should have just gone direct to the sender.  This was how the old list was.

With mailman it's on the General Options page, about 9 down:
Where are replies to list messages directed? = Poster

Thanks,
Seb




From jonathan_science at hotmail.com  Fri Apr  6 00:28:58 2007
From: jonathan_science at hotmail.com (J P)
Date: Thu, 05 Apr 2007 18:28:58 -0400
Subject: [sdiy] FS: x0xb0x full kit (New)
In-Reply-To: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
Message-ID: <BAY111-F26BF4CECC2A9C99D25B08FFD650@phx.gbl>

Sorry Sorry Sorry, I thought it was AH, where it automatically responds to 
sender rather than list...

Won't ever happen again.

Jonathan

----Obedience is Pleasure----




>From: "J P" <jonathan_science at hotmail.com>
>Reply-To: synthesizer diy electronics <synth-diy at dropmix.xs4all.nl>
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] FS: x0xb0x full kit (New)
>Date: Thu, 05 Apr 2007 18:06:08 -0400
>
>I'll buy it.  Do you still have it available?
>
>$400.
>
>Jonathan Pratt
>Atlanta GA
>
>I can mail a money order this weekend
>
>----Obedience is Pleasure----
>
>
>
>
>>From: <ceme at cox.net>
>>Reply-To: synthesizer diy electronics <synth-diy at dropmix.xs4all.nl>
>>To: synth-diy at vermine.org, synth-diy at dropmix.xs4all.nl
>>Subject: [sdiy] FS: x0xb0x full kit (New)
>>Date: Thu, 5 Apr 2007 16:19:14 -0500
>>
>>For sale - <US only>
>>
>>Untouched (ie, still in packaging) x0xb0x (#447) full kit as purchased 
>>from adafruit last December.
>>
>>Has USB interface board installed.
>>Center-detent tuning pot included.
>>Power adapter included.
>>All parts, pots, etc as supplied with the kit (which has everything you 
>>need).
>>Stock case and the clear plexi-glass top, too.
>>
>>Asking $400 (which includes insured priority shipping) - I paid $405 with 
>>shipping.
>>
>>I have only opened the original packaging to check out the stuff.  
>>Everything is untouched.  But everything is there.
>>
>>I bought this in December '06 and haven't had time to get started on it.  
>>(Another child on the way, so I need a little extra $ and time.)
>>
>>For payment, I'd like to go money order - unless buyer would like to pay 
>>the PayPal fees (not sure what the percentage is at time of writing this).
>>
>>Email with any questions.  I can supply pics.
>>
>>Chris
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>_________________________________________________________________
>The average US Credit Score is 675. The cost to see yours: $0 by Experian. 
>http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
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From cfmd at bredband.net  Fri Apr  6 00:41:54 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Fri, 06 Apr 2007 00:41:54 +0200 (CEST)
Subject: [sdiy] Reply to sender not list
In-Reply-To: <461576D4.4030206@burnit.co.uk>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
	<461576D4.4030206@burnit.co.uk>
Message-ID: <20070406.004154.-1386878330.cfmd@bredband.net>

From: Seb Francis <seb at burnit.co.uk>
Subject: [sdiy] Reply to sender not list
Date: Thu, 05 Apr 2007 23:23:16 +0100
Message-ID: <461576D4.4030206 at burnit.co.uk>

> Hi Rick,

Hi Rick and Seb,

> Any chance we can have the mailman settings set to reply to sender by 
> default, not to whole list.  Seem to be a few replies recently that 
> should have just gone direct to the sender.  This was how the old list was.
> 
> With mailman it's on the General Options page, about 9 down:
> Where are replies to list messages directed? = Poster

I'm not in favor of this. This is a discussion list. We get into this room and
talk about Synth-DIY stuff, that's what the door says anyway. If we need to
discuss things of to the others we wisper them in the ear or drag them out
the door for that private conversation. The default behavour is to reply to all
and that is what I usually expect things to be. Only rarely do I bring things
off-list. I know that some people have as their default behaviour to only
reply to the sender, but most people is served by default replying to list.

For the old list, my default behaviour was to respond to the list, and that is
exactly how I want it. What have happend is that Mailman triggers a different
behaviour in your client. That is what you should fix to fit your needs.
You can also adjust your preferences as a subscriber through the web interface.

So again, no. Don't change.

Cheers,
Magnus - in the midst of rebuilding studio - to the better!


From dalenkarl at yahoo.se  Fri Apr  6 00:48:52 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Fri, 6 Apr 2007 00:48:52 +0200 (CEST)
Subject: SV: Re: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <Pine.GSO.4.64.0704050313310.12289@vipunen.hut.fi>
Message-ID: <20070405224852.51552.qmail@web27603.mail.ukl.yahoo.com>

I thought you understood my indirect sugestion?
Anyhow, you do need high resulution and also high
accuracy especially for the low freq range
even if you divide down your linear DAC.

*Static* DC and gain can be large but not huge!
Unfortunately they are *temperature and code* dependent.
Also, mux charge injection can play a role here to.
Mux Rds on plays a role it changes its value depending on voltage.

Even a ancient MCU would do, i don't see the reason why the wouldn't?

KD 

--- Antti Huovilainen <ajhuovil at cc.hut.fi> skrev:

> On Thu, 5 Apr 2007, karl dalen wrote:
> 
> > Use linear VCO no tuning!
> 
> Nah, use linear VCOs under microprocessor control. No manual tuning, no 
> trimming, no drift. All you need is a non ancient MCU (AVR, ARM, basically 
> anything that was invented after early 80s) and a high resolution DAC (but 
> not high accuracy, DC and gain error can be huge without problems).
> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>    -- Lt. Cmdr. Ivanova
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
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kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From ajhuovil at cc.hut.fi  Fri Apr  6 00:56:22 2007
From: ajhuovil at cc.hut.fi (Antti Huovilainen)
Date: Fri, 6 Apr 2007 01:56:22 +0300 (EEST)
Subject: SV: Re: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <20070405224852.51552.qmail@web27603.mail.ukl.yahoo.com>
References: <20070405224852.51552.qmail@web27603.mail.ukl.yahoo.com>
Message-ID: <Pine.GSO.4.64.0704060152340.12289@vipunen.hut.fi>

On Fri, 6 Apr 2007, karl dalen wrote:

> I thought you understood my indirect sugestion?

> Anyhow, you do need high resulution and also high
> accuracy especially for the low freq range

High resolution and differential linearity yes, accuracy no.

> *Static* DC and gain can be large but not huge!
> Unfortunately they are *temperature and code* dependent.

Code dependency goes to nonlinearity = lower resolution (I did 
say high resolution). As for temperature, the whole idea is based around 
autotune so any temperature dependency would be cancelled. The main point 
is that you do not need very good offset or gain accuracy (which cost).

> Even a ancient MCU would do, i don't see the reason why the wouldn't?

You'd have trouble calculating all the modulations at > 1 kHz rate for 
multiple VCOs.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova


From tu at alphalink.com.au  Fri Apr  6 00:59:50 2007
From: tu at alphalink.com.au (Tristan Upton)
Date: Fri, 06 Apr 2007 08:29:50 +0930
Subject: [sdiy] encoder with =?utf-8?B?MS84Ig==?= shaft
In-Reply-To: <46156F44.2000409@new.rr.com>
References: <46156F44.2000409@new.rr.com>
Message-ID: <20070405225950.305DDF4005@mail01.chariot.net.au>

Hi Drew, 

The Bournes 3315 might fit the bill. 

http://www.bourns.com/pdfs/3315.pdf 

Available from Farnell: 

http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9354042 

Regards, 

Tristan 

drew meyer writes: 

> i've found the perfect knob for a project i'm working on, but it requires 
> a rotary encoder with an 1/8" shaft.  does anybody know of any? 
> 
> thanks, 
> 
> drew
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From ijfritz at comcast.net  Fri Apr  6 01:48:26 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Thu, 05 Apr 2007 17:48:26 -0600
Subject: [sdiy] Reply to sender not list
In-Reply-To: <461576D4.4030206@burnit.co.uk>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
	<461576D4.4030206@burnit.co.uk>
Message-ID: <6.2.1.2.2.20070405174752.020aa140@mail.comcast.net>

Yes, *please*.  I asked about this a few days ago. Is Rick gone again?


At 04:23 PM 4/5/2007, Seb Francis wrote:
>Hi Rick,
>
>Any chance we can have the mailman settings set to reply to sender by 
>default, not to whole list.  Seem to be a few replies recently that should 
>have just gone direct to the sender.  This was how the old list was.
>
>With mailman it's on the General Options page, about 9 down:
>Where are replies to list messages directed? = Poster
>
>Thanks,
>Seb
>
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From ijfritz at comcast.net  Fri Apr  6 01:51:19 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Thu, 05 Apr 2007 17:51:19 -0600
Subject: [sdiy] Reply to sender not list
In-Reply-To: <20070406.004154.-1386878330.cfmd@bredband.net>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
	<461576D4.4030206@burnit.co.uk>
	<20070406.004154.-1386878330.cfmd@bredband.net>
Message-ID: <6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>

At 04:41 PM 4/5/2007, Magnus Danielson wrote:


>For the old list, my default behaviour was to respond to the list, and that is
>exactly how I want it. What have happend is that Mailman triggers a different
>behaviour in your client. That is what you should fix to fit your needs.
>You can also adjust your preferences as a subscriber through the web 
>interface.
>
>So again, no. Don't change.


Disagree.  With the old list clicking "reply" went just to the original 
sender, not the list.  Clicking "reply all" went to the whole list.  I 
would really like to see this fixed. 



From pfperry at melbpc.org.au  Fri Apr  6 02:09:37 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Fri, 6 Apr 2007 10:09:37 +1000
Subject: [sdiy] Reply to sender not list
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl><461576D4.4030206@burnit.co.uk>
	<6.2.1.2.2.20070405174752.020aa140@mail.comcast.net>
Message-ID: <00c401c777df$df0e09c0$5401a8c0@frostwave>

If there's a vote on this, I'm up for automatically replying t the
individal,
not the list.
I always try to look where I'm sending mail ;-D but, if I make a mistake,
it's obviously less damage done if it is to and individual rather than the
list,
rather than vice-vesa!

paul perry Melbourne Australia
(eating 85% choc)

----- Original Message ----- 
From: "Ian Fritz"
> >Any chance we can have the mailman settings set to reply to sender by
> >default, not to whole list.  Seem to be a few replies recently that
should
> >have just gone direct to the sender.  This was how the old list was.



From seb at burnit.co.uk  Fri Apr  6 02:17:08 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Fri, 06 Apr 2007 01:17:08 +0100
Subject: [sdiy] Reply to sender not list
In-Reply-To: <20070406.004154.-1386878330.cfmd@bredband.net>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>	<461576D4.4030206@burnit.co.uk>
	<20070406.004154.-1386878330.cfmd@bredband.net>
Message-ID: <46159184.2070208@burnit.co.uk>

I didn't want to get into a big discussion about it - I was only asking 
for it to go back to the way it was before.  This way worked much better 
- you can hit Reply to send to sender and Reply-To-All to send to list.  
Otherwise it's a manual process to send an email to the sender.

I've been through all this recently with another mailing list I run and 
for people using Outlook Express (yes there are some unfortunately!) 
it's quite hard to reply to sender only when the list is set up like 
this since OE doesn't readily show the email address of the sender.

Magnus Danielson wrote:
> For the old list, my default behaviour was to respond to the list, and that is
> exactly how I want it.
Well then you shouldn't care if the list goes back to working in the way 
it previously did then!

> What have happend is that Mailman triggers a different
> behaviour in your client. That is what you should fix to fit your needs.
>   
What is happening now is that Mailman is adding a Reply-To field to all 
posts.  You're surely not saying I should configure my email client to 
ignore Reply-To fields?

> You can also adjust your preferences as a subscriber through the web interface.
>   
No you can't, this setting is global only.

Seb




From davebr at earthlink.net  Fri Apr  6 02:39:12 2007
From: davebr at earthlink.net (David Brown)
Date: Thu, 05 Apr 2007 17:39:12 -0700
Subject: [sdiy] MiniWave EPROMs
In-Reply-To: <46152025.8010309@clickbang.com>
References: <46152025.8010309@clickbang.com>
Message-ID: <0JG100IUIWHAPL94@vms040.mailsrvcs.net>

At 09:13 AM 4/5/2007, mrmike wrote:
>I finally coughed up the $ for a Balcet Miniwave.

If you come up with any that are good, be sure to share.  I have 5 
empty sockets and always looking for recommendations.

Blacet, I assume :)

Dave



From cfmd at bredband.net  Fri Apr  6 02:40:47 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Fri, 06 Apr 2007 02:40:47 +0200 (CEST)
Subject: [sdiy] Reply to sender not list
In-Reply-To: <46159184.2070208@burnit.co.uk>
References: <461576D4.4030206@burnit.co.uk>
	<20070406.004154.-1386878330.cfmd@bredband.net>
	<46159184.2070208@burnit.co.uk>
Message-ID: <20070406.024047.1358706475.cfmd@bredband.net>

From: Seb Francis <seb at burnit.co.uk>
Subject: Re: [sdiy] Reply to sender not list
Date: Fri, 06 Apr 2007 01:17:08 +0100
Message-ID: <46159184.2070208 at burnit.co.uk>

Seb,

> I didn't want to get into a big discussion about it - I was only asking 
> for it to go back to the way it was before.  This way worked much better 
> - you can hit Reply to send to sender and Reply-To-All to send to list.  
> Otherwise it's a manual process to send an email to the sender.
> 
> I've been through all this recently with another mailing list I run and 
> for people using Outlook Express (yes there are some unfortunately!) 
> it's quite hard to reply to sender only when the list is set up like 
> this since OE doesn't readily show the email address of the sender.
> 
> Magnus Danielson wrote:
> > For the old list, my default behaviour was to respond to the list, and that is
> > exactly how I want it.
> Well then you shouldn't care if the list goes back to working in the way 
> it previously did then!
> 
> > What have happend is that Mailman triggers a different
> > behaviour in your client. That is what you should fix to fit your needs.
> >   
> What is happening now is that Mailman is adding a Reply-To field to all 
> posts.  You're surely not saying I should configure my email client to 
> ignore Reply-To fields?

With those specifics in mind, going back to not setting Reply-To seems fair
enought.

I'm not totally reliable tonight, as I am rebuilding the studio almost from
scratch, or rather, it would make as much difference if I did do it from
scratch. My server seems to handle the mess pretty well. My judgement in email
list management aspects is dodgy tonight. I guess it is a sacrifice we would
have to live with.

Cheers,
Magnus - just about to go down and put the other speaker in place (phew!)


From cary.roberts at retrosynth.net  Fri Apr  6 07:17:37 2007
From: cary.roberts at retrosynth.net (Cary Roberts)
Date: Fri, 6 Apr 2007 01:17:37 -0400
Subject: [sdiy] MiniWave EPROMs
Message-ID: <00d001c7780a$e45fd400$6500a8c0@camilla>

>I finally coughed up the $ for a Balcet Miniwave. I'd like to try my
>hand at burning my own proms. Does anyone know if a specific variant of
>the 27C512 eproms is required? Is a 90ns unit fast enough?

Since the conversion time of the ADC0820 in the unit is 2.5us the EPROM
can be pretty darn slow and not make a difference.  I'd suggest going
with a FLASH part so you don't have to wait around for the EPROM to
erase.  A 29F512 is the same price as a 27C512 at most places.

Of course you can also cram a 4mbit part in there too with a little bit
of work:

	http://www.retrosynth.com/gear/minirom/

'cause every miniwave needs the full PPG wavetables with 32 banks of 64
waves each. :)

-Cary




From jason at redfish.net  Fri Apr  6 07:51:40 2007
From: jason at redfish.net (Jason Proctor)
Date: Thu, 5 Apr 2007 22:51:40 -0700
Subject: [sdiy] MiniWave EPROMs
In-Reply-To: <00d001c7780a$e45fd400$6500a8c0@camilla>
References: <00d001c7780a$e45fd400$6500a8c0@camilla>
Message-ID: <a06200711c23b905aff9d@[10.0.1.203]>

>Of course you can also cram a 4mbit part in there too with a little bit
>of work:
>
>	http://www.retrosynth.com/gear/minirom/
>
>'cause every miniwave needs the full PPG wavetables with 32 banks of 64
>waves each. :)

and i thought we were going to co-announce?

:-)



From don at till.com  Fri Apr  6 09:34:16 2007
From: don at till.com (Don Tillman)
Date: Fri, 06 Apr 2007 00:34:16 -0700
Subject: [sdiy] Reply to sender not list
Message-ID: <m24pnut0qv.fsf@till.com>

Folks,

The choice of who one replies to should be the responsiblity of the
user's mail program.  The mail program should have both "reply to
sender" and "reply to all" buttons, and the user should be hitting the
appropriate button, and the buttons should work correctly.

There is this feature called a "Reply-to: header" that can be included
in any mail message.  The purpose is to replace the regular reply
behavior for the case where the original sender really, really wants
any replies to go somewhere else.  An example would be if I were
having a party and I was sending out invitations; I absolutely don't
want the responses to go back to the list.  Likewise if I was
conducting a survey, I might want the responses to go to a special
mailbox that's been set up to parse them.  The reply-to field is only
intended for exceptional cases like those.

Mailing list programs include a reply-to field option because it's
easy to implement and it's useful for anouncement lists.

The original synth-diy list didn't use the reply-to header, this new
list has the reply-to header set to the synth-diy list, and that is
subverting the default mail program operation.

Here's some good reading on the subject:

  "Reply-To" Munging Considered Harmful
  http://www.unicom.com/pw/reply-to-harmful.html

  "Reply-To" Munging Still Considered Harmful. Really.
  http://woozle.org/~neale/papers/reply-to-still-harmful.html

  RFC-822 Standard For the Format of ARPA Internet Text Messages
  ftp://ftp.isi.edu/in-notes/rfc822.txt

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com


From louis at dompselaar.org  Fri Apr  6 09:47:44 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Fri, 06 Apr 2007 09:47:44 +0200
Subject: [sdiy] SAA1099
Message-ID: <4615FB20.3050705@dompselaar.org>

Recently somewhere on an sdiy forum or list (I can't seem to figure out 
where)
the SAA1099 was discussed as being not very useful and "still available".

The latter point interests me. I have two M4741DEV (which I think are 
SAA1099
clones) of which I'm not sure if they still work.  If they don't, I 
might be interested in
getting some 'new' ones.  So if anyone knows a source that would be great.

Louis



From mr at analogue.org  Fri Apr  6 11:36:12 2007
From: mr at analogue.org (Mattias Rickardsson)
Date: Fri, 6 Apr 2007 11:36:12 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <m24pnut0qv.fsf@till.com>
References: <m24pnut0qv.fsf@till.com>
Message-ID: <1f4a82040704060236y14a68593v5eaa0bf02d5236a3@mail.gmail.com>

FWIW, I vote for replies going to the list.

(I know there are hundreds of reasons to have it going to the
individual instead, especially technical ones, but I prefer to hit a
reply button and have my reply directed to where the email came from
-  the list.
If I want to email a person, I email a person. It's not often done,
and it's not that tricky.
If the replies go to the list, I always know that I don't send it to
just one person by mistake. I don't have to check my sent email or the
list emails to make sure that I'm heard. If someone makes a mistake
and sends a personal email to the list, it's better than having
important list emails mistakenly going to just one person. People tend
to learn from these mistakes, too. And if I want to send something
secret to one person, I always double-check the address I send it to,
regardless of the reply behaviour.
List replies going to the list are just natural. As simple as that.)

/mr


From samppa.tolvanen at gmail.com  Fri Apr  6 12:15:17 2007
From: samppa.tolvanen at gmail.com (Samppa Tolvanen)
Date: Fri, 6 Apr 2007 13:15:17 +0300
Subject: [sdiy] Reply to sender not list
In-Reply-To: <m24pnut0qv.fsf@till.com>
References: <m24pnut0qv.fsf@till.com>
Message-ID: <fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>

On 4/6/07, Don Tillman <don at till.com> wrote:
> Folks,
>
> The choice of who one replies to should be the responsiblity of the
> user's mail program.  The mail program should have both "reply to
> sender" and "reply to all" buttons, and the user should be hitting the
> appropriate button, and the buttons should work correctly.
>

Sadly reporting, that setting "reply to:" header broke Gmails "reply
to all" option.

So, probably I?m asking, how many others have e-mail clients which
can?t handle the current situation properly?

Samppa



From bdevries at gil.com.au  Fri Apr  6 13:00:34 2007
From: bdevries at gil.com.au (Bob Devries)
Date: Fri, 6 Apr 2007 21:00:34 +1000
Subject: [sdiy] Reply to sender not list
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
Message-ID: <00e001c7783a$cd7b88d0$0801a8c0@master>

I use OE V6, and I cannot now reply to the individual sender. Both "reply" 
and "reply all" point to the list.
This is not the best way, IMHO.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Samppa Tolvanen" <samppa.tolvanen at gmail.com>
To: "synthesizer diy electronics" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, April 06, 2007 8:15 PM
Subject: Re: [sdiy] Reply to sender not list


> On 4/6/07, Don Tillman <don at till.com> wrote:
>> Folks,
>>
>> The choice of who one replies to should be the responsiblity of the
>> user's mail program.  The mail program should have both "reply to
>> sender" and "reply to all" buttons, and the user should be hitting the
>> appropriate button, and the buttons should work correctly.
>>
>
> Sadly reporting, that setting "reply to:" header broke Gmails "reply
> to all" option.
>
> So, probably I?m asking, how many others have e-mail clients which
> can?t handle the current situation properly?
>
> Samppa
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.446 / Virus Database: 268.18.26/748 - Release Date: 5/04/2007 
> 3:33 PM
>
> 



From stffn at dibidut.dk  Fri Apr  6 13:06:27 2007
From: stffn at dibidut.dk (Steffen)
Date: Fri, 6 Apr 2007 13:06:27 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
Message-ID: <12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>

The maillist software also sets other headers then the reply-to  
header. Fx:

List-Id: 	synthesizer diy electronics <synth-diy.dropmix.xs4all.nl>

List-Unsubscribe: 	<http://dropmix.xs4all.nl/mailman/listinfo/synth- 
diy>, <mailto:synth-diy-request at dropmix.xs4all.nl?subject=unsubscribe>

List-Archive: 	<http://dropmix.xs4all.nl/pipermail/synth-diy>

List-Post: 	<mailto:synth-diy at dropmix.xs4all.nl>

List-Help: 	<mailto:synth-diy-request at dropmix.xs4all.nl?subject=help>

List-Subscribe: 	<http://dropmix.xs4all.nl/mailman/listinfo/synth- 
diy>, <mailto:synth-diy-request at dropmix.xs4all.nl?subject=subscribe>

Some email clients have a "reply to list" option also. I guess that  
option uses either of these headers, properly the List-Post header.  
Now that's a hole third way of dealing whit it. Which combined with  
seting the list to reply to poster is preferred as it leave the most  
options to the user.

Not having that feature in the email client causes extra "work": When  
the list is set such that hitting reply send to the poster only, not  
the list, then one have to hit reply-all to reply to the list. But  
that also involves sending a CC to alot of other folks rather then  
just the list. Hence trimming the send To/CC fields really is needed.

But it's not a big issue to me. Just my humble thoughts.

On 06/04/2007, at 12.15, Samppa Tolvanen wrote:

> Sadly reporting, that setting "reply to:" header broke Gmails "reply
> to all" option.

How does it brake?


From samppa.tolvanen at gmail.com  Fri Apr  6 13:55:17 2007
From: samppa.tolvanen at gmail.com (Samppa Tolvanen)
Date: Fri, 6 Apr 2007 14:55:17 +0300
Subject: [sdiy] Reply to sender not list
In-Reply-To: <12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
Message-ID: <fa1b0bd80704060455k2e1b6b49u6fc5a5d28053168b@mail.gmail.com>

Steffen, all.

On 4/6/07, Steffen <stffn at dibidut.dk> wrote:
>
> Not having that feature in the email client causes extra "work": When
> the list is set such that hitting reply send to the poster only, not
> the list, then one have to hit reply-all to reply to the list. But
> that also involves sending a CC to alot of other folks rather then
> just the list. Hence trimming the send To/CC fields really is needed.
>

This describes the way gmail handled list mail before - for a "point &
click" webmail it wasn?t an issue. (Not sure, if it would annoy me if
I were using Pine)

> But it's not a big issue to me. Just my humble thoughts.

;)

>
> > Sadly reporting, that setting "reply to:" header broke Gmails "reply
> > to all" option.

>
> How does it brake?

Setting "reply to:" header seem to "force" replies to the list:
There?s no "reply to all" available, so If I wanted to reply directly
to You or CC this message, I?d have to manually copy Your address for
that.

Samppa



From seb at burnit.co.uk  Fri Apr  6 13:56:46 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Fri, 06 Apr 2007 12:56:46 +0100
Subject: [sdiy] Reply to sender not list
In-Reply-To: <12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
References: <m24pnut0qv.fsf@till.com>	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
Message-ID: <4616357E.10808@burnit.co.uk>

Steffen wrote:
>
> Not having that feature in the email client causes extra "work": When 
> the list is set such that hitting reply send to the poster only, not 
> the list, then one have to hit reply-all to reply to the list. But 
> that also involves sending a CC to alot of other folks rather then 
> just the list. Hence trimming the send To/CC fields really is needed.
>

Although in this case many (but not all) email servers will ensure that 
each recipient only receives the email once.

Actually with Mailman this shouldn't be a problem for anyone as there is 
a user level option "Avoid duplicate copies of messages?" which is set 
to Yes by default.  This will avoid sending out the email via the list 
to anyone who is To'ed or Cc'ed.

Here's hoping Rick reads all these emails soon .... :)

Seb




From dougt55 at yahoo.com  Fri Apr  6 14:43:36 2007
From: dougt55 at yahoo.com (Doug Terrebonne)
Date: Fri, 6 Apr 2007 05:43:36 -0700 (PDT)
Subject: [sdiy] Reply to sender not list
In-Reply-To: <fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
Message-ID: <778928.4675.qm@web81207.mail.mud.yahoo.com>


--- Samppa Tolvanen <samppa.tolvanen at gmail.com> wrote:

> Sadly reporting, that setting "reply to:" header broke Gmails "reply
> to all" option.
> 
> So, probably I?m asking, how many others have e-mail clients which
> can?t handle the current situation properly?

In Yahoo it's broken too. Both Reply to Sender and Reply to Everyone go
to the list. The only way I can reply to the sender is by cutting and
pasting the senders email address into the TO field by hand...




From rick.jansen at xs4all.nl  Fri Apr  6 14:48:08 2007
From: rick.jansen at xs4all.nl (Rick Jansen)
Date: Fri, 06 Apr 2007 14:48:08 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <4616357E.10808@burnit.co.uk>
References: <m24pnut0qv.fsf@till.com>	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<4616357E.10808@burnit.co.uk>
Message-ID: <46164188.5050507@xs4all.nl>

Seb Francis zee op 4/6/07 1:56 PM:
> Steffen wrote:
>>
>> Not having that feature in the email client causes extra "work": When 
>> the list is set such that hitting reply send to the poster only, not 
>> the list, then one have to hit reply-all to reply to the list. But 
>> that also involves sending a CC to alot of other folks rather then 
>> just the list. Hence trimming the send To/CC fields really is needed.
>>
> 
> Although in this case many (but not all) email servers will ensure that 
> each recipient only receives the email once.
> 
> Actually with Mailman this shouldn't be a problem for anyone as there is 
> a user level option "Avoid duplicate copies of messages?" which is set 
> to Yes by default.  This will avoid sending out the email via the list 
> to anyone who is To'ed or Cc'ed.
> 
> Here's hoping Rick reads all these emails soon .... :)

Njrghh!

I'm in favour of a reply to the LIST if you just hit 'REPLY', and a
reply to both list and original sender if you hit 'reply all'. You can
then delete the list if you don't want the list to list-en in.

It is a group-discussion list primarily, not a trigger for private
conversations. I guess most people intend to reply to the list in the
first place, so let's keep that the default behaviour.

I will add the original sender to the headers, I hadn't noticed they
were missing.

rick




From stffn at dibidut.dk  Fri Apr  6 15:14:23 2007
From: stffn at dibidut.dk (Steffen)
Date: Fri, 6 Apr 2007 15:14:23 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <fa1b0bd80704060455k2e1b6b49u6fc5a5d28053168b@mail.gmail.com>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<fa1b0bd80704060455k2e1b6b49u6fc5a5d28053168b@mail.gmail.com>
Message-ID: <E27B1374-8ED2-4267-AF84-1A2A95722B02@dibidut.dk>


On 06/04/2007, at 13.55, Samppa Tolvanen wrote:

>>
>> > Sadly reporting, that setting "reply to:" header broke Gmails  
>> "reply
>> > to all" option.
>
>>
>> How does it brake?
>
> Setting "reply to:" header seem to "force" replies to the list:
> There?s no "reply to all" available, so If I wanted to reply directly
> to You or CC this message, I?d have to manually copy Your address for
> that.

Ah, Ok. I think that is exactly the behavior that is being talked  
about. I'm to do the same whit this mail client. And I'm sure it's  
the same in Pine ;-)

It's weird though, that GMail strips the reply-to-all link. I have  
the reply-to-all button but it, as mention in this thread, results in  
the same action.


From stffn at dibidut.dk  Fri Apr  6 15:31:57 2007
From: stffn at dibidut.dk (Steffen)
Date: Fri, 6 Apr 2007 15:31:57 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <4616357E.10808@burnit.co.uk>
References: <m24pnut0qv.fsf@till.com>	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<4616357E.10808@burnit.co.uk>
Message-ID: <1CEC6C2F-4B91-4721-B2CA-F4031B4C1244@dibidut.dk>


On 06/04/2007, at 13.56, Seb Francis wrote:

> Steffen wrote:
>>
>> Not having that feature in the email client causes extra "work":  
>> When the list is set such that hitting reply send to the poster  
>> only, not the list, then one have to hit reply-all to reply to the  
>> list. But that also involves sending a CC to alot of other folks  
>> rather then just the list. Hence trimming the send To/CC fields  
>> really is needed.
>>
>
> Although in this case many (but not all) email servers will ensure  
> that each recipient only receives the email once.

But one to more of the recipients may have unsubscribed. But that  
might be a minor issue.


ps.
Now it has changed to:
reply to -> sender
replay all -> sender and cc the list. 


From ijfritz at comcast.net  Fri Apr  6 16:03:38 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Fri, 06 Apr 2007 08:03:38 -0600
Subject: [sdiy] Reply to sender not list
In-Reply-To: <46164188.5050507@xs4all.nl>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<4616357E.10808@burnit.co.uk> <46164188.5050507@xs4all.nl>
Message-ID: <6.2.1.2.2.20070406075101.020b4d40@mail.comcast.net>

At 06:48 AM 4/6/2007, you wrote:

>Njrghh!
>
>I'm in favour of a reply to the LIST if you just hit 'REPLY', and a
>reply to both list and original sender if you hit 'reply all'. You can
>then delete the list if you don't want the list to list-en in.

So if I want to reply to one person, I have to hit "reply-all" and delete 
everybody else?  Not logical, captain.  Your "reply" and "reply-all" 
choices don't seem to be any different, since the original poster is on the 
list.


>It is a group-discussion list primarily, not a trigger for private
>conversations. I guess most people intend to reply to the list in the
>first place, so let's keep that the default behaviour.

Well, it's your decision, of course.  But I think there is a *lot* of off 
list business going on, and for many good reasons.  So why shouldn't we be 
able to do it easily with a simple choice?

   Ian 



From jansmail at xs4all.nl  Fri Apr  6 16:34:55 2007
From: jansmail at xs4all.nl (Rick Jansen)
Date: Fri, 06 Apr 2007 16:34:55 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <6.2.1.2.2.20070406075101.020b4d40@mail.comcast.net>
References: <m24pnut0qv.fsf@till.com>	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>	<4616357E.10808@burnit.co.uk>
	<46164188.5050507@xs4all.nl>
	<6.2.1.2.2.20070406075101.020b4d40@mail.comcast.net>
Message-ID: <46165A8F.7000408@xs4all.nl>

Ian Fritz zee op 4/6/07 4:03 PM:
> At 06:48 AM 4/6/2007, you wrote:
> 
>>Njrghh!
>>
>>I'm in favour of a reply to the LIST if you just hit 'REPLY', and a
>>reply to both list and original sender if you hit 'reply all'. You can
>>then delete the list if you don't want the list to list-en in.
> 
> So if I want to reply to one person, I have to hit "reply-all" and delete 
> everybody else?  Not logical, captain.  Your "reply" and "reply-all" 
> choices don't seem to be any different, since the original poster is on the 
> list.
> 
> 
>>It is a group-discussion list primarily, not a trigger for private
>>conversations. I guess most people intend to reply to the list in the
>>first place, so let's keep that the default behaviour.
> 
> Well, it's your decision, of course.  But I think there is a *lot* of off 
> list business going on, and for many good reasons.  So why shouldn't we be 
> able to do it easily with a simple choice?

Well, I had a look at the mailman settings. (Couldn't avoid that
really.) They advise to set the "reply-to" to the original poster. So
I'll listen to them. Choosing "reply-all" will get you both the original
sender and the list, selecting "reply" the original sender. I made it
so. I can set an explicit reply-to header to the list, but probably that
isn't even necessary.

Sooo, pay attention to where your replies go ;-)

(Do you get this message once or twice, Ian?)

rick




From aym-htnys at teaser.fr  Fri Apr  6 16:42:39 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Fri, 6 Apr 2007 16:42:39 +0200
Subject: [sdiy] Reply to sender not list
In-Reply-To: <4616357E.10808@burnit.co.uk>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<4616357E.10808@burnit.co.uk>
Message-ID: <20070406144239.GD28536@aym.net2.nerim.net>

On 2007-04-06 12:56 +0100, Seb Francis wrote:

> Actually with Mailman this shouldn't be a problem for anyone
> as there is a user level option "Avoid duplicate copies of
> messages?" which is set to Yes by default.  This will avoid
> sending out the email via the list to anyone who is To'ed or
> Cc'ed.

This brings its own set of problems. For one thing, your
synth-diy mail folder is not a list archive any more since it
has a hole wherever someone CC-d you. This may or may not be a
big deal to you but for me it is.

Thanks for reminding me of clearing it. :-)

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From ijfritz at comcast.net  Fri Apr  6 17:59:39 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Fri, 06 Apr 2007 09:59:39 -0600
Subject: [sdiy] Reply to sender not list
In-Reply-To: <46165A8F.7000408@xs4all.nl>
References: <m24pnut0qv.fsf@till.com>
	<fa1b0bd80704060315i4e9f6785l6acaf4090b7c45e1@mail.gmail.com>
	<12E24352-5D44-477E-BCAF-36104BE33959@dibidut.dk>
	<4616357E.10808@burnit.co.uk> <46164188.5050507@xs4all.nl>
	<6.2.1.2.2.20070406075101.020b4d40@mail.comcast.net>
	<46165A8F.7000408@xs4all.nl>
Message-ID: <6.2.1.2.2.20070406095723.020ae6e8@mail.comcast.net>

At 08:34 AM 4/6/2007, Rick Jansen wrote:

>Well, I had a look at the mailman settings. (Couldn't avoid that
>really.) They advise to set the "reply-to" to the original poster. So
>I'll listen to them. Choosing "reply-all" will get you both the original
>sender and the list, selecting "reply" the original sender. I made it
>so. I can set an explicit reply-to header to the list, but probably that
>isn't even necessary.
>
>Sooo, pay attention to where your replies go ;-)
>
>(Do you get this message once or twice, Ian?)

Hi Rick.  I got in once.  Thanks a lot for considering everyone's input on 
this subject, and for your many years of hosting this list.

   Ian



From mrmike at clickbang.com  Fri Apr  6 18:43:49 2007
From: mrmike at clickbang.com (mrmike)
Date: Fri, 06 Apr 2007 11:43:49 -0500
Subject: [sdiy] MiniWave EPROMs
In-Reply-To: <00d001c7780a$e45fd400$6500a8c0@camilla>
References: <00d001c7780a$e45fd400$6500a8c0@camilla>
Message-ID: <461678C5.1050301@clickbang.com>

Oh, sure, taunt us with pictures. So when will it be available?

Cary Roberts wrote:
>> I finally coughed up the $ for a Balcet Miniwave. I'd like to try my
>> hand at burning my own proms. Does anyone know if a specific variant of
>> the 27C512 eproms is required? Is a 90ns unit fast enough?
>>     
>
> Since the conversion time of the ADC0820 in the unit is 2.5us the EPROM
> can be pretty darn slow and not make a difference.  I'd suggest going
> with a FLASH part so you don't have to wait around for the EPROM to
> erase.  A 29F512 is the same price as a 27C512 at most places.
>
> Of course you can also cram a 4mbit part in there too with a little bit
> of work:
>
> 	http://www.retrosynth.com/gear/minirom/
>
> 'cause every miniwave needs the full PPG wavetables with 32 banks of 64
> waves each. :)
>
> -Cary
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>   



From rtellason at verizon.net  Fri Apr  6 19:35:01 2007
From: rtellason at verizon.net (Roy J. Tellason)
Date: Fri, 06 Apr 2007 13:35:01 -0400
Subject: [sdiy] Reply to sender not list
In-Reply-To: <6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl>
	<20070406.004154.-1386878330.cfmd@bredband.net>
	<6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>
Message-ID: <200704061335.01551.rtellason@verizon.net>

On Thursday 05 April 2007 19:51, Ian Fritz wrote:
> At 04:41 PM 4/5/2007, Magnus Danielson wrote:
> >For the old list, my default behaviour was to respond to the list, and
> > that is exactly how I want it. What have happend is that Mailman triggers
> > a different behaviour in your client. That is what you should fix to fit
> > your needs. You can also adjust your preferences as a subscriber through
> > the web interface.
> >
> >So again, no. Don't change.
>
> Disagree.  With the old list clicking "reply" went just to the original
> sender, not the list.  Clicking "reply all" went to the whole list.  I
> would really like to see this fixed.

I,  on the other hand,  would prefer "reply" to go to the list.  This is the 
way that most of the 100+ lists I subscribe to work,  and there's only one 
other exception.

It's annoying when a list does that...

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin



From xpandrew at ph.k12.in.us  Fri Apr  6 19:46:20 2007
From: xpandrew at ph.k12.in.us (Dump Static)
Date: Fri, 06 Apr 2007 12:46:20 -0500
Subject: [sdiy] MiniWave EPROMs
Message-ID: <46164F2C020000670000A88D@smithers.ph.k12.in.us>

Having played with this at AHMW a couple weeks ago I give it three
thumbs up.

It is way f*cking cool.

Andrew

>>> "Cary Roberts" <cary.roberts at retrosynth.net> 04/06/07 12:17 AM >>>
Since the conversion time of the ADC0820 in the unit is 2.5us the EPROM
can be pretty darn slow and not make a difference.  I'd suggest going
with a FLASH part so you don't have to wait around for the EPROM to
erase.  A 29F512 is the same price as a 27C512 at most places.

Of course you can also cram a 4mbit part in there too with a little bit
of work:

	http://www.retrosynth.com/gear/minirom/

'cause every miniwave needs the full PPG wavetables with 32 banks of 64
waves each. :)

-Cary


_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From psychick at ptd.net  Fri Apr  6 20:05:41 2007
From: psychick at ptd.net (m.j.kulengosky)
Date: Fri, 6 Apr 2007 14:05:41 -0400
Subject: [sdiy] Reply to sender not list
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl><20070406.004154.-1386878330.cfmd@bredband.net><6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>
	<200704061335.01551.rtellason@verizon.net>
Message-ID: <001501c77876$31df99c0$17e94b0c@desktop>

> I,  on the other hand,  would prefer "reply" to go to the list.  This is 
> the
> way that most of the 100+ lists I subscribe to work,  and there's only one
> other exception.
>
> It's annoying when a list does that...

i would prefer if the list was available in digest format... the option 
exists on the list admin page but, has apparently been disabled. please make 
this an option.

thank you. 



From nixotic1 at blueyonder.co.uk  Fri Apr  6 20:27:25 2007
From: nixotic1 at blueyonder.co.uk (Quixotic Nixotic)
Date: Fri, 6 Apr 2007 19:27:25 +0100
Subject: [sdiy] Reply to sender not list
In-Reply-To: <001501c77876$31df99c0$17e94b0c@desktop>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl><20070406.004154.-1386878330.cfmd@bredband.net><6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>
	<200704061335.01551.rtellason@verizon.net>
	<001501c77876$31df99c0$17e94b0c@desktop>
Message-ID: <528633FA-2787-427B-9A2A-54D2348484B0@blueyonder.co.uk>

If this group doesn't stop arguing about email formats, I am  
unsubscribing; what is the matter with you all? About 75% of this  
group's mail is superfluous nonsense, however it is delivered and  
responded to.

Can we please get back on topic? I don't have a lifetime long enough,

John



From rick.jansen at xs4all.nl  Fri Apr  6 20:43:57 2007
From: rick.jansen at xs4all.nl (Rick Jansen)
Date: Fri, 06 Apr 2007 20:43:57 +0200
Subject: [sdiy] Digests (was: Reply to sender not list)
In-Reply-To: <001501c77876$31df99c0$17e94b0c@desktop>
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl><20070406.004154.-1386878330.cfmd@bredband.net><6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net>	<200704061335.01551.rtellason@verizon.net>
	<001501c77876$31df99c0$17e94b0c@desktop>
Message-ID: <461694ED.1040208@xs4all.nl>

m.j.kulengosky zee op 4/6/07 8:05 PM:

> i would prefer if the list was available in digest format... the option 
> exists on the list admin page but, has apparently been disabled. please make 
> this an option.

This is something we discussed years ago: if a digest is available
people will reply to a digest and the context of the message is lost.
(Or does MailMan have a clever solution to this?) So I disbled the
digest indeed.

Note: if you do select the digest-option you will *NOT* receive mail.

rick


From louis at dompselaar.org  Fri Apr  6 21:08:54 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Fri, 06 Apr 2007 21:08:54 +0200
Subject: [sdiy] MiniWave EPROMs
In-Reply-To: <00d001c7780a$e45fd400$6500a8c0@camilla>
References: <00d001c7780a$e45fd400$6500a8c0@camilla>
Message-ID: <46169AC6.1060506@dompselaar.org>

How do the Blacet tables compare to the Digisound ones?

Or more specically, would it be possible to adapt this PCB for
my Ken Stone wavetable (which is the Digisound one).

> Since the conversion time of the ADC0820 in the unit is 2.5us the EPROM
> can be pretty darn slow and not make a difference.  I'd suggest going
> with a FLASH part so you don't have to wait around for the EPROM to
> erase.  A 29F512 is the same price as a 27C512 at most places.
>
> Of course you can also cram a 4mbit part in there too with a little bit
> of work:
>
> 	http://www.retrosynth.com/gear/minirom/
>
> 'cause every miniwave needs the full PPG wavetables with 32 banks of 64
> waves each. :)
>
> -Cary



From jhaible at debitel.net  Fri Apr  6 21:37:44 2007
From: jhaible at debitel.net (JH.)
Date: Fri, 6 Apr 2007 21:37:44 +0200
Subject: [sdiy] Reply to sender not list
References: <BAY111-F13A087DFF8AC084BFB8AC6FD650@phx.gbl><20070406.004154.-1386878330.cfmd@bredband.net><6.2.1.2.2.20070405174924.020c1a10@mail.comcast.net><200704061335.01551.rtellason@verizon.net><001501c77876$31df99c0$17e94b0c@desktop>
	<528633FA-2787-427B-9A2A-54D2348484B0@blueyonder.co.uk>
Message-ID: <001201c77883$0ea39940$0200a8c0@jhsilent>


>If this group doesn't stop arguing about email formats, I am
>unsubscribing; what is the matter with you all?

We're addicts to building our own synthesizers - we don't unsubscribe. ;)

>About 75% of this  group's mail is superfluous nonsense, however it is 
>delivered and
>responded to.

No idea if these figures are right, but even if 90% were nonsense, the 
remaining 10% would still make it the best mailing list on the whole web - 
for me.

JH.




From ijfritz at comcast.net  Fri Apr  6 22:41:58 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Fri, 06 Apr 2007 14:41:58 -0600
Subject: [sdiy] website moved
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>

Hello --

Just a quick note to let folks know that my website has been moved to
http://home.comcast.net/~ijfritz

This gives me more space, and I am in the process of putting up some of the 
material on chaos circuits that I've been working on for the past couple of 
years.

I have already put up some introductory information on the relation between 
the mathematical systems of differential equations found in chaos theory 
and electronic circuits, including OTA based circuits with voltage 
controlled frequency and damping.

There is also a section with a new EZ circuit that requires just two chips, 
but can demonstrate most of the features generally found in chaotic 
systems.  This circuit has manual control of frequency and damping, and is 
driven by an external oscillator, which could be a synth LFO.
http://home.comcast.net/~ijfritz/ch_cir1.htm
I am considering making boards available for this project, so please let me 
know (off list) if you might be interested in obtaining one.

   Ian



From yves.usson at imag.fr  Fri Apr  6 23:03:20 2007
From: yves.usson at imag.fr (yves usson)
Date: Fri, 06 Apr 2007 23:03:20 +0200
Subject: [sdiy] website moved
In-Reply-To: <6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
Message-ID: <4616B598.2050306@imag.fr>

Bookmarks updated !

Ian Fritz a ?crit :
> Hello --
> 
> Just a quick note to let folks know that my website has been moved to
> http://home.comcast.net/~ijfritz
> 
> This gives me more space, and I am in the process of putting up some of 
> the material on chaos circuits that I've been working on for the past 
> couple of years.
> 
> I have already put up some introductory information on the relation 
> between the mathematical systems of differential equations found in 
> chaos theory and electronic circuits, including OTA based circuits with 
> voltage controlled frequency and damping.
> 
> There is also a section with a new EZ circuit that requires just two 
> chips, but can demonstrate most of the features generally found in 
> chaotic systems.  This circuit has manual control of frequency and 
> damping, and is driven by an external oscillator, which could be a synth 
> LFO.
> http://home.comcast.net/~ijfritz/ch_cir1.htm
> I am considering making boards available for this project, so please let 
> me know (off list) if you might be interested in obtaining one.
> 
>   Ian
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


-- 
Yves Usson
http://yusynth.net


From paul.leitch at sympatico.ca  Fri Apr  6 23:05:22 2007
From: paul.leitch at sympatico.ca (paul.leitch at sympatico.ca)
Date: Fri, 6 Apr 2007 17:05:22 -0400
Subject: [sdiy] Remove my name please
Message-ID: <20070406210522.FAYX1671.tomts5-srv.bellnexxia.net@smtp1.sympatico.ca>

Please remove my name for now
Thanks
Paul Leitch



From raywilson at comcast.net  Sat Apr  7 01:54:54 2007
From: raywilson at comcast.net (Ray Wilson)
Date: Fri, 6 Apr 2007 17:54:54 -0600
Subject: [sdiy] website moved
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
Message-ID: <001601c778a6$f96b46d0$6901a8c0@RaysOffice>

Thanks Ian. MFOS updated the link to your excellent site. Thanks for the
fine work you do.

Cheers

Ray

----- Original Message ----- 
From: "Ian Fritz" <ijfritz at comcast.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, April 06, 2007 2:41 PM
Subject: [sdiy] website moved


> Hello --
>
> Just a quick note to let folks know that my website has been moved to
> http://home.comcast.net/~ijfritz
>
> This gives me more space, and I am in the process of putting up some of 
> the material on chaos circuits that I've been working on for the past 
> couple of years.
>
> I have already put up some introductory information on the relation 
> between the mathematical systems of differential equations found in chaos 
> theory and electronic circuits, including OTA based circuits with voltage 
> controlled frequency and damping.
>
> There is also a section with a new EZ circuit that requires just two 
> chips, but can demonstrate most of the features generally found in chaotic 
> systems.  This circuit has manual control of frequency and damping, and is 
> driven by an external oscillator, which could be a synth LFO.
> http://home.comcast.net/~ijfritz/ch_cir1.htm
> I am considering making boards available for this project, so please let 
> me know (off list) if you might be interested in obtaining one.
>
>   Ian
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From eat-it at new.rr.com  Sat Apr  7 03:05:16 2007
From: eat-it at new.rr.com (drew meyer)
Date: Fri, 06 Apr 2007 20:05:16 -0500
Subject: [sdiy] encoder with 1/8" shaft
In-Reply-To: <20070405225950.305DDF4005@mail01.chariot.net.au>
References: <46156F44.2000409@new.rr.com>
	<20070405225950.305DDF4005@mail01.chariot.net.au>
Message-ID: <4616EE4C.60404@new.rr.com>

thanks tristan.  this looks like it'll fit the bill.  now i just gotta 
find out if it'll work with the midibox project (16 ppr vs. 24 ppr).

drew


Tristan Upton wrote:
> Hi Drew,
> The Bournes 3315 might fit the bill.
> http://www.bourns.com/pdfs/3315.pdf
> Available from Farnell:
> http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9354042
> Regards,
> Tristan
> drew meyer writes:
>> i've found the perfect knob for a project i'm working on, but it 
>> requires a rotary encoder with an 1/8" shaft.  does anybody know of any?
>> thanks,
>> drew
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From psychick at ptd.net  Sat Apr  7 05:03:58 2007
From: psychick at ptd.net (psychick at ptd.net)
Date: Sat, 07 Apr 2007 03:03:58 +0000
Subject: [sdiy] Digests (was: Reply to sender not list)
Message-ID: <040720070303.11085.46170A1E00010F7700002B4D2160376223050C07080C979C9F@att.net>

From: Rick Jansen <rick.jansen at xs4all.nl>

> This is something we discussed years ago: if a digest is available
> people will reply to a digest and the context of the message is lost.
> (Or does MailMan have a clever solution to this?) So I disbled the
> digest indeed.
> 
> Note: if you do select the digest-option you will *NOT* receive mail.

having only joined this list recently, i guess i don't understand the history but, this seems like a pretty weak reason for not having digests. i'm usually not a very vocal member of the lists i'm on but, getting 50 individual messages a day about why someone can't stop to pay attention to who or what they're replying to has been a bit frustrating. is stopping to modify the subject line of your message too much?

apologies if i'm offending anyone here... but, i always appreciate just being able to read through a daily (or more than daily) digest. and this is an option, not mandatory behaviour like where the replies go by default...

thanks for understanding.


From music.maker at gte.net  Sat Apr  7 07:05:19 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Fri, 06 Apr 2007 22:05:19 -0700
Subject: [sdiy] Digests (was: Reply to sender not list)
Message-ID: <200704070505.l3755JLJ005867@linux7.lan>

psychick at ptd.net wrote:
>From: Rick Jansen <rick.jansen at xs4all.nl>
>
>> This is something we discussed years ago: if a digest is available
>> people will reply to a digest and the context of the message is lost.
>> (Or does MailMan have a clever solution to this?) So I disbled the
>> digest indeed.
>> 
>> Note: if you do select the digest-option you will *NOT* receive mail.
>
>having only joined this list recently, i guess i don't understand 
>the history but, this seems like a pretty weak reason for not 
>having digests. i'm usually not a very vocal member of the lists 
>i'm on but, getting 50 individual messages a day about why 
>someone can't stop to pay attention to who or what they're 
>replying to has been a bit frustrating. is stopping to modify the 
>subject line of your message too much? 
>
>apologies if i'm offending anyone here... but, i always 
>appreciate just being able to read through a daily (or more than 
>daily) digest. and this is an option, not mandatory behaviour 
>like where the replies go by default... 
>
>thanks for understanding.

For what it might be worth, I think I can copy and paste a subject from a digest. 
Yeah, I will occasionally be a doofus and forget to do that, but ok, crucify me,
nobody is perfect.  I'm in a position where I really can't tolerate the traffic
anymore - I have two choices, hit delete 50 times a day or just unsub.  

Why?  because we can't have a digest?  ????  REALLY?  C'mon people.  Please please
please let's have a digest available for those of us that are interested and want
mostly to read and respond to a few. P-L-E-A-S-E ????

_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From billbigrig at yahoo.com  Sat Apr  7 07:22:04 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Fri, 6 Apr 2007 22:22:04 -0700 (PDT)
Subject: [sdiy] 5024 top octave generator
Message-ID: <788015.56990.qm@web32703.mail.mud.yahoo.com>

Howdy,

 Is there any other top octave chips to look for or is
 the 5024 the only one? If not, what other chip
numbers do I look for. Thanx in advance.
Rig


 
____________________________________________________________________________________
Food fight? Enjoy some healthy debate 
in the Yahoo! Answers Food & Drink Q&A.
http://answers.yahoo.com/dir/?link=list&sid=396545367


From dlmanley at sonic.net  Sat Apr  7 07:32:39 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Fri, 06 Apr 2007 22:32:39 -0700
Subject: [sdiy] complete searchable sdiy archive
Message-ID: <46172CF7.4080605@sonic.net>

The number one thing I'd like to see is a complete searchable sdiy 
archive.  Is there any way to pull together the various sdiy archives 
into one database?

-Dave


From nicksdsu at mac.com  Sat Apr  7 08:05:40 2007
From: nicksdsu at mac.com (Nicholas Gregorich)
Date: Fri, 6 Apr 2007 23:05:40 -0700
Subject: [sdiy] complete searchable sdiy archive
In-Reply-To: <46172CF7.4080605@sonic.net>
References: <46172CF7.4080605@sonic.net>
Message-ID: <5F00CC64-139D-4BE0-93CE-3C7B0C2C0B7A@mac.com>


On Apr 6, 2007, at 10:32 PM, Dave Manley wrote:

> The number one thing I'd like to see is a complete searchable sdiy  
> archive.  Is there any way to pull together the various sdiy  
> archives into one database?
>
> -Dave

I'd really like that too, or more specifically a mbox file so I could  
search using my own mail client.

Can anyone help me out with a complete or semi-complete SDIY archive?

Thanks.

Nick.


From aym-htnys at teaser.fr  Sat Apr  7 08:56:26 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Sat, 7 Apr 2007 08:56:26 +0200
Subject: [sdiy] Digests (was: Reply to sender not list)
In-Reply-To: <040720070303.11085.46170A1E00010F7700002B4D2160376223050C07080C979C9F@att.net>
References: <040720070303.11085.46170A1E00010F7700002B4D2160376223050C07080C979C9F@att.net>
Message-ID: <20070407065626.GE28536@aym.net2.nerim.net>

On 2007-04-07 03:03 +0000, psychick at ptd.net wrote:
> From: Rick Jansen <rick.jansen at xs4all.nl>
> 
> > This is something we discussed years ago: if a digest is
> > available people will reply to a digest and the context of the
> > message is lost.  (Or does MailMan have a clever solution to
> > this?) So I disbled the digest indeed.
> > 
> > Note: if you do select the digest-option you will *NOT*
> > receive mail.
> 
> having only joined this list recently, i guess i don't
> understand the history but, this seems like a pretty weak reason
> for not having digests. i'm usually not a very vocal member of
> the lists i'm on but, getting 50 individual messages a day about
> why someone can't stop to pay attention to who or what they're
> replying to has been a bit frustrating. is stopping to modify
> the subject line of your message too much?

The problems caused by having 50 individual messages a day can
(and should) be solved. That's what multiple email addresses and
the filtering functions in your email client are for.

The problems caused by people who are in digest mode and post
anyway cannot be solved. They don't make the effort of using the
exact same subject. And even if they did, threading is not based
on subject, but on the Message-ID and In-Reply-To headers. Once
the Message-ID/In-Reply-To chain is broken, reconstructing a
thread becomes an AI project.

  http://shlang.com/good-email-use.html

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From cary.roberts at retrosynth.net  Sat Apr  7 09:08:50 2007
From: cary.roberts at retrosynth.net (Cary Roberts)
Date: Sat, 7 Apr 2007 03:08:50 -0400
Subject: [sdiy] Alternative to Mil Max machined pin .1" headers
Message-ID: <000001c778e3$9881ef30$6500a8c0@camilla>

I'm looking for a low (or lower) cost alternative to the Mil Max
350-10-1xx-00-001000 machined pin single row headers with .1" spacing.
I'm using them on a PCB that inserts into a wide body DIP socket (EPROM)
and the target boards may have machined pin sockets.  This rules out
cheap .1" headers with square .025" pins.  Most machine pin EPROM
sockets will take up to .025" diameter pins, although .018-.020" is
probably ideal.  In quantity I'm looking at ~$4 for 28 pins of the Mil
Max connectors.  Surely there's something out there in the sub $1 range.
Anyone?  Here's a picture of the application:

http://www.retrosynth.com/gear/minirom/minirom_rev1/minirom_rev1_001.jpg


Thanks.

-Cary



From jhaible at debitel.net  Sat Apr  7 09:23:29 2007
From: jhaible at debitel.net (JH.)
Date: Sat, 7 Apr 2007 09:23:29 +0200
Subject: archives (was: Re: [sdiy] Digests (was: Reply to sender not list)
References: <200704070505.l3755JLJ005867@linux7.lan>
Message-ID: <000601c778e5$a5469a20$0200a8c0@jhsilent>

I haven't fully followed the discussion, but I think there is a way to read 
a digest, sort of:
You can read the archives (they seem to be updated as quickly as you'd 
expect a digest to come, and allow the display of the last day, last two 
days, last week, you name it. Customised digest, I'd call it.)
If we can subscribe in "digest mode", only without getting a digest, we 
should be able to reply to the list, from what we've copied and pasted from 
the archives. Not really more compicated than a real digest.

JH.


----- Original Message ----- 
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, April 07, 2007 7:05 AM
Subject: Re: [sdiy] Digests (was: Reply to sender not list)


psychick at ptd.net wrote:
>From: Rick Jansen <rick.jansen at xs4all.nl>
>
>> This is something we discussed years ago: if a digest is available
>> people will reply to a digest and the context of the message is lost.
>> (Or does MailMan have a clever solution to this?) So I disbled the
>> digest indeed.
>>
>> Note: if you do select the digest-option you will *NOT* receive mail.
>
>having only joined this list recently, i guess i don't understand
>the history but, this seems like a pretty weak reason for not
>having digests. i'm usually not a very vocal member of the lists
>i'm on but, getting 50 individual messages a day about why
>someone can't stop to pay attention to who or what they're
>replying to has been a bit frustrating. is stopping to modify the
>subject line of your message too much?
>
>apologies if i'm offending anyone here... but, i always
>appreciate just being able to read through a daily (or more than
>daily) digest. and this is an option, not mandatory behaviour
>like where the replies go by default...
>
>thanks for understanding.

For what it might be worth, I think I can copy and paste a subject from a 
digest.
Yeah, I will occasionally be a doofus and forget to do that, but ok, crucify 
me,
nobody is perfect.  I'm in a position where I really can't tolerate the 
traffic
anymore - I have two choices, hit delete 50 times a day or just unsub.

Why?  because we can't have a digest?  ????  REALLY?  C'mon people.  Please 
please
please let's have a digest available for those of us that are interested and 
want
mostly to read and respond to a few. P-L-E-A-S-E ????

_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/


_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




From aym-htnys at teaser.fr  Sat Apr  7 10:25:55 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Sat, 7 Apr 2007 10:25:55 +0200
Subject: [sdiy] Analog Devices V/F / F/V converters (AD537, AD650, AD652,
	AD654, AD7740, ADVFC32)
Message-ID: <20070407082555.GF28536@aym.net2.nerim.net>

Analog Devices make a number of a voltage-to-frequency /
frequency-to-voltage converters : AD537, AD650, AD652, AD654,
AD7740 and ADVFC32. Those I've looked at don't seem to have an
exponential voltage-to-frequency relationship, though.

Are any of those of any use for synth or general audio
applications ? Especially, are there existing designs based on
them ?

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From pfperry at melbpc.org.au  Sat Apr  7 10:31:25 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Sat, 7 Apr 2007 18:31:25 +1000
Subject: [sdiy] 5024 top octave generator
References: <788015.56990.qm@web32703.mail.mud.yahoo.com>
Message-ID: <003301c778ef$218aa640$5401a8c0@frostwave>

Googling I see AC-30214 and AY-1-0212

I expect someone somewhere is making a PIC version.

paul perry Melbourne Australia
----- Original Message ----- 


From pfperry at melbpc.org.au  Sat Apr  7 11:17:28 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Sat, 7 Apr 2007 19:17:28 +1000
Subject: [sdiy] Analog Devices V/F / F/V converters (AD537, AD650, AD652,
	AD654, AD7740, ADVFC32)
References: <20070407082555.GF28536@aym.net2.nerim.net>
Message-ID: <007d01c778f5$9098c480$5401a8c0@frostwave>

http://www.dogstar.dantimax.dk/theremin/disptech.htm pitch displayer
is based on the National LM2917 V to F.

But, these things are really designed for tachometer applications, where
you want to get a DC indication from a frequency. Or the other way around,
for converting a slowly varying voltage to an AC signal that is easy to
route
through a noisy environment. I think micros have done these things out of
work,
And they are all linear.(in the sense of f directly proportinal to v)

paul perry Melbourne Australia



From tom at electricdruid.net  Sat Apr  7 13:39:01 2007
From: tom at electricdruid.net (Tom Wiltshire)
Date: Sat, 7 Apr 2007 12:39:01 +0100
Subject: [sdiy] 5024 top octave generator
References: <3CDFA563-7549-4F62-972C-8ADBE3BAFAB4@electricdruid.net>
Message-ID: <111C37D6-AF5C-40C3-8B42-376251C67797@electricdruid.net>




On 7 Apr 2007, at 09:31, Paul Perry wrote:

> Googling I see AC-30214 and AY-1-0212

There's a good list of Top octave chips on:

http://www.organservice.com/crm/topdividers.htm

> I expect someone somewhere is making a PIC version.

The nearest I've seen is Scott Rider's:

http://chip.aeug.org/other.html

But as he says, you'd need a really high speed part to get a true top  
octave.


Tom




From neil.johnson97 at ntlworld.com  Sat Apr  7 13:45:18 2007
From: neil.johnson97 at ntlworld.com (Neil Johnson)
Date: Sat, 7 Apr 2007 12:45:18 +0100
Subject: [sdiy] Digests (was: Reply to sender not list)
In-Reply-To: <200704070505.l3755JLJ005867@linux7.lan>
References: <200704070505.l3755JLJ005867@linux7.lan>
Message-ID: <AB3BD300-5AB6-4096-8891-2C5B8AB61AD5@ntlworld.com>


On 7 Apr 2007, at 06:05, Scott Gravenhorst wrote:
> Why?  because we can't have a digest?  ????  REALLY?  C'mon  
> people.  Please please
> please let's have a digest available for those of us that are  
> interested and want
> mostly to read and respond to a few. P-L-E-A-S-E ????

Sorry if I'm being blond, but why not just set up a mail filter/rule  
that moves messages with "[sdiy]" in the subject to a specific  
folder?  Pine can do that, OSX Mail client can do that, I think  
Outlook can do it too (but I only use it for work and don't need that  
functionality).  Then you (a) maintain thread consistency, and (b)  
have a MUCH better idea of how much traffic there is on a given day  
(just count the number of new messages).  And it makes it much easier  
to view by thread, or sender, or date, etc.

Neil
--
http://www.njohnson.co.uk





From stffn at dibidut.dk  Sat Apr  7 15:03:38 2007
From: stffn at dibidut.dk (Steffen)
Date: Sat, 7 Apr 2007 15:03:38 +0200
Subject: [sdiy] website moved
In-Reply-To: <6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
Message-ID: <8C2A43E9-506C-46AD-B465-C8EEC6CE5684@dibidut.dk>


On 06/04/2007, at 22.41, Ian Fritz wrote:

> I have already put up some introductory information on the relation  
> between the mathematical systems of differential equations found in  
> chaos theory and electronic circuits, including OTA based circuits  
> with voltage controlled frequency and damping.

Thanks for sharing this. I can't wait to dive into it. The sounds are  
splendid.

Best, Steffen


From jbuckf50 at hotmail.com  Sat Apr  7 15:46:12 2007
From: jbuckf50 at hotmail.com (Josh Forgione)
Date: Sat, 07 Apr 2007 13:46:12 +0000
Subject: [sdiy] Analog Devices V/F / F/V converters (AD537, AD650, AD652,
	AD654, AD774
In-Reply-To: <20070407082555.GF28536@aym.net2.nerim.net>
Message-ID: <BAY144-F109FAE44D3DB9CD9E26B43D95B0@phx.gbl>

I've used the AD650 extensively, though not in synth applications.

The voltage to frequency relationship is a linear relationship.  
Nonlinearity can be calculated depending on how you've configured the part 
(see the datasheet).

Since the AD650 is essentially an integrator, comparator, then one shot, the 
output pulse width is constant across all frequencies.  So at the max 
frequency you'd get a 50% duty cycle wave, but as your frequency dercreases 
so does the duty cycle.

The strength of the V/F is you can achieve high linearity when when using it 
as part of an A/D or D/A conversion.  It's a great alternative to A/Ds if 
you have several channels that need to be transmitted over a long distance.

One possible synth application could be the generation of a trigger pulse 
based on a control voltage input.

Josh

>From: Andre Majorel <aym-htnys at teaser.fr>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] Analog Devices V/F / F/V converters (AD537, AD650, 
>AD652,AD654, AD7740, ADVFC32)
>Date: Sat, 7 Apr 2007 10:25:55 +0200
>
>Analog Devices make a number of a voltage-to-frequency /
>frequency-to-voltage converters : AD537, AD650, AD652, AD654,
>AD7740 and ADVFC32. Those I've looked at don't seem to have an
>exponential voltage-to-frequency relationship, though.
>
>Are any of those of any use for synth or general audio
>applications ? Especially, are there existing designs based on
>them ?
>
>--
>Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
>Do not use this account for regular correspondence.
>See the URL above for contact information.
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Can?t afford to quit your job? ? Earn your AS, BS, or MS degree online in 1 
year. 
http://www.classesusa.com/clickcount.cfm?id=866145&goto=http%3A%2F%2Fwww.classesusa.com%2Ffeaturedschools%2Fonlinedegreesmp%2Fform-dyn1.html%3Fsplovr%3D866143



From music.maker at gte.net  Sat Apr  7 16:17:56 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Sat, 07 Apr 2007 07:17:56 -0700
Subject: [sdiy] Digests (was: Reply to sender not list)
Message-ID: <200704071417.l37EHunm003938@linux7.lan>

Neil Johnson <neil.johnson97 at ntlworld.com> wrote:
>
>On 7 Apr 2007, at 06:05, Scott Gravenhorst wrote:
>> Why?  because we can't have a digest?  ????  REALLY?  C'mon  
>> people.  Please please
>> please let's have a digest available for those of us that are  
>> interested and want
>> mostly to read and respond to a few. P-L-E-A-S-E ????
>
>Sorry if I'm being blond, but why not just set up a mail filter/rule  
>that moves messages with "[sdiy]" in the subject to a specific  
>folder?  Pine can do that, OSX Mail client can do that, I think  
>Outlook can do it too (but I only use it for work and don't need that  
>functionality).  Then you (a) maintain thread consistency, and (b)  
>have a MUCH better idea of how much traffic there is on a given day  
>(just count the number of new messages).  And it makes it much easier  
>to view by thread, or sender, or date, etc.

I don't use a commercial email product.  It doesn't have those features and I don't
have the time nor the inclination to write them.



-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From stffn at dibidut.dk  Sat Apr  7 16:57:17 2007
From: stffn at dibidut.dk (Steffen)
Date: Sat, 7 Apr 2007 16:57:17 +0200
Subject: [sdiy] Digests (was: Reply to sender not list)
In-Reply-To: <200704071417.l37EHunm003938@linux7.lan>
References: <200704071417.l37EHunm003938@linux7.lan>
Message-ID: <43ADADDB-D158-4365-9717-9B8B2786AA71@dibidut.dk>


On 07/04/2007, at 16.17, Scott Gravenhorst wrote:

>> Sorry if I'm being blond, but why not just set up a mail filter/rule
>> that moves messages with "[sdiy]" in the subject to a specific
>> folder? [...]
>
> I don't use a commercial email product.  It doesn't have those  
> features and I don't have the time nor the inclination to write them.
>

Mozilla Mail (and lots of other FOSS email clients) can filter email  
per subject to a mail folder.

See for example http://css.engineering.uiowa.edu/email/ 
mozilla_filtering.html

Best, Steffen





From moogah at gmail.com  Sat Apr  7 17:19:16 2007
From: moogah at gmail.com (Jeff Farr)
Date: Sat, 7 Apr 2007 11:19:16 -0400
Subject: [sdiy] complete searchable sdiy archive
In-Reply-To: <5F00CC64-139D-4BE0-93CE-3C7B0C2C0B7A@mac.com>
References: <46172CF7.4080605@sonic.net>
	<5F00CC64-139D-4BE0-93CE-3C7B0C2C0B7A@mac.com>
Message-ID: <78f89520704070819r2c5b78c0q33272d3c46fc054c@mail.gmail.com>

This one is pretty good:

http://www.retrosynth.com/synth-diy/index.html


From cary.roberts at retrosynth.net  Sat Apr  7 18:07:34 2007
From: cary.roberts at retrosynth.net (Cary Roberts)
Date: Sat, 7 Apr 2007 12:07:34 -0400
Subject: [sdiy] complete searchable sdiy archive
Message-ID: <000f01c7792e$e9dd4f00$6500a8c0@camilla>

>This one is pretty good:
>
>http://www.retrosynth.com/synth-diy/index.html


Actually, they're missing July 2001 - July 2004.  If anyone has those
years I'd gladly take them and index them.  As long as there's a
date/to/from/subject header I can munge the rest to make it work.

For daily reading of the list it works well.  It's what I use to read
the list.

-Cary





From billbigrig at yahoo.com  Sat Apr  7 20:25:46 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Sat, 7 Apr 2007 11:25:46 -0700 (PDT)
Subject: [sdiy] sdiy v/f f/v etc.
Message-ID: <386744.99669.qm@web32707.mail.mud.yahoo.com>

Howdy,

 If you are going for a pitch to control voltage
module, go to mark.godfrey at gatech.edu. Ask for
"ECE4803 final project". I am holding in my hand his
design that uses a LM2917N and a quad TL084, and a
CA3046 along with some odds and ends to make one. It
looks pretty simple on paper.
Rig


 
____________________________________________________________________________________
Be a PS3 game guru.
Get your game face on with the latest PS3 news and previews at Yahoo! Games.
http://videogames.yahoo.com/platform?platform=120121


From jonathan_science at hotmail.com  Sat Apr  7 22:49:56 2007
From: jonathan_science at hotmail.com (J P)
Date: Sat, 07 Apr 2007 16:49:56 -0400
Subject: [sdiy] .dxf to .hpgl converter...
Message-ID: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>

Does anyone know of free software to make this conversion?

I don't have linux, and I cannot compile anything, why on God's earth cannot 
things be simple?

I'm trying to get LadyAda's panels for the x0xb0x into Front Panel Express's 
design softwarez...

Any help would be appreciated.

Kthanx,

Jonathan

_________________________________________________________________
Can?t afford to quit your job? ? Earn your AS, BS, or MS degree online in 1 
year. 
http://www.classesusa.com/clickcount.cfm?id=866145&goto=http%3A%2F%2Fwww.classesusa.com%2Ffeaturedschools%2Fonlinedegreesmp%2Fform-dyn1.html%3Fsplovr%3D866143



From seb at burnit.co.uk  Sat Apr  7 23:10:25 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Sat, 07 Apr 2007 22:10:25 +0100
Subject: [sdiy] .dxf to .hpgl converter...
In-Reply-To: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>
References: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>
Message-ID: <461808C1.4050404@burnit.co.uk>

J P wrote:
> Does anyone know of free software to make this conversion?
>

I use Corel Draw 6, not free but so old that it must be very cheap if
you can find it second hand.  Later versions also will work, and maybe
earlier versions too?

Seb





From tim.parkhurst at gmail.com  Sun Apr  8 01:06:46 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sat, 7 Apr 2007 16:06:46 -0700
Subject: [sdiy] .dxf to .hpgl converter...
In-Reply-To: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>
References: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>
Message-ID: <87441170704071606s76a4cbcei8183b936928438c3@mail.gmail.com>

On 4/7/07, J P <jonathan_science at hotmail.com> wrote:
> Does anyone know of free software to make this conversion?
>
> I don't have linux, and I cannot compile anything, why on God's earth cannot
> things be simple?
>
> I'm trying to get LadyAda's panels for the x0xb0x into Front Panel Express's
> design softwarez...
>
> Any help would be appreciated.
>
> Kthanx,
>
> Jonathan
>

You might be able to do something with the various DXF viewers on the
market. There should be some free ones to be found with a Google
search. To get HPGL out, you'll probably need to print or plot to a
file (as opposed to the normal Export or Save As methods of converting
a file), and select HPGL as the file type. I know Corel Draw and
AutoCAD can read a DXF and plot HPGL, so vector-based illustration or
CAD programs / viewers will probably do what you need. I know
CorelDraw 8 or 9 are very cheap now.


Tim (I can plot my revenge, but only if it's an HPGL file) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From dalenkarl at yahoo.se  Sun Apr  8 01:22:59 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Sun, 8 Apr 2007 01:22:59 +0200 (CEST)
Subject: SV: Re: SV: Re: SV: Re: [sdiy] VCO autotune for poly analog modular
In-Reply-To: <Pine.GSO.4.64.0704060152340.12289@vipunen.hut.fi>
Message-ID: <672713.65085.qm@web27608.mail.ukl.yahoo.com>


--- Antti Huovilainen <ajhuovil at cc.hut.fi> skrev:

> On Fri, 6 Apr 2007, karl dalen wrote:
> 
> > I thought you understood my indirect sugestion?
> 
> > Anyhow, you do need high resulution and also high
> > accuracy especially for the low freq range
> 
> High resolution and differential linearity yes, accuracy no.

No, at low freq you need accuracy.
Just as in a exponetial driven VCO one neeeds that all 
parameters in DAC are good, not just average.

Actually, you dont need high accuracy, you can basically
do the Fatman trick  with a 8 bit DAC and divide down.
If you want to.

> > *Static* DC and gain can be large but not huge!
> > Unfortunately they are *temperature and code* dependent.
> 
> Code dependency goes to nonlinearity = lower resolution (I did 
> say high resolution). As for temperature, the whole idea is based around 
> autotune so any temperature dependency would be cancelled. The main point 
> is that you do not need very good offset or gain accuracy (which cost).
> 
> > Even a ancient MCU would do, i don't see the reason why the wouldn't?
> 
> You'd have trouble calculating all the modulations at > 1 kHz rate for 
> multiple VCOs.

*Where* did he say that he was going to do it in rel time?

KD


> 
> Antti
> 
> "No boom today. Boom tomorrow. There's always a boom tomorrow"
>    -- Lt. Cmdr. Ivanova
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
_________________________________________________________
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kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From russells.mn at gmail.com  Sun Apr  8 02:25:49 2007
From: russells.mn at gmail.com (Russ S)
Date: Sat, 7 Apr 2007 19:25:49 -0500
Subject: [sdiy] .dxf to .hpgl converter...
In-Reply-To: <87441170704071606s76a4cbcei8183b936928438c3@mail.gmail.com>
References: <BAY111-F34FB47A29B29EB82B0F0C4FD5B0@phx.gbl>
	<87441170704071606s76a4cbcei8183b936928438c3@mail.gmail.com>
Message-ID: <5b91724f0704071725q6c1db6e4w849668d29c27bfd4@mail.gmail.com>

Having worked for many years on Jasc's Paint Shop Pro (now owned by
Corel, with whom I have no affiliation), I know that it also supports
both formats.  Again, older version can probably be found pretty
cheap.  Depending upon the version, it may retain vector or it may
convert to raster when it reads the file.

On 4/7/07, Tim Parkhurst <tim.parkhurst at gmail.com> wrote:
>
> You might be able to do something with the various DXF viewers on the
> market. There should be some free ones to be found with a Google
> search. To get HPGL out, you'll probably need to print or plot to a
> file (as opposed to the normal Export or Save As methods of converting
> a file), and select HPGL as the file type. I know Corel Draw and
> AutoCAD can read a DXF and plot HPGL, so vector-based illustration or
> CAD programs / viewers will probably do what you need. I know
> CorelDraw 8 or 9 are very cheap now.


From synth at casperelectronics.com  Sun Apr  8 03:32:38 2007
From: synth at casperelectronics.com (peter edwards)
Date: Sat, 7 Apr 2007 21:32:38 -0400
Subject: [sdiy] center tapped pots?
Message-ID: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>

Howdy y'all...
I'm looking for a couple 100K, dual, center tapped pots and can't  
seem to find them anywhere. I found some manufacturers but no small  
quantity distributors. Anybody have any leads?

Maybe there's an alternate method for achieving my goal and I don't  
need a center tapped pot, but I can't think of one...

If anyone is interested in giving me some pointers, please read on.
I'm building a vocal FX unit using the PT2399 echo IC and the HT8950  
vocal processor IC (pitch changer).
The basic layout is as follows:
One vocal signal splits through two op-amps. The inverted signals are  
sent one to the echo and the second to the pitch changer. Then the  
output from the two circuits are mixed together, inverted again and  
sent to the output.  So you have 1 input signal that goes through two  
FX circuits in parallel. What I want to do is include a control so  
one of the two wet signals can be routed into the other, pre-mixer.   
This is what I would use the dual, center tapped pot for. I would  
wire the center tapped lug to the left lug and ground both so that  
way the volume control window would be silence from 7-12  
o'clock....Silence to full volume from 12-5 o'clock (does that make  
sense??) The second pot would be reversed. So that way when the  
control is all the way counter clockwise it would send the echo into  
the pitch changer. As you turn the knob clockwise it would fade to  
silence. At the center position, there would be no signal. Then as  
you turn it clockwise past the center position the signal from pitch  
changer into the echo would increase.

any thoughts for alternate methods or obvious flaws in my design?????


From scott at tellun.com  Sun Apr  8 07:01:14 2007
From: scott at tellun.com (Scott Juskiw)
Date: Sat, 07 Apr 2007 23:01:14 -0600
Subject: [sdiy] center tapped pots?
In-Reply-To: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
Message-ID: <p06230904c23e26fc2ea9@[192.168.1.101]>

>Maybe there's an alternate method for achieving my goal and I don't 
>need a center tapped pot, but I can't think of one...

You could do this with a couple of VCAs with the right transfer 
functions for the control inputs. I did this in my neural agonizer. 
You'd only need a regular 100K pot (not a dual pot, and not 
centre-tapped). But it adds a considerable amount of circuitry, which 
you may not want.


From xyzzy at sysabend.org  Sun Apr  8 07:54:16 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Sat, 7 Apr 2007 22:54:16 -0700
Subject: [sdiy] CV buffer
Message-ID: <20070408055416.GR47569@moo.sysabend.org>

I need to build a buffer so I can spread a single CV out to multiple
destinations without cross pollination on the output side.  I'd just do a
quick opamp buffer but I remember reading horror stories on this list of
tiny errors being added.

Any suggestions on a stable way to do this without adding noticable error?

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From tim.parkhurst at gmail.com  Sun Apr  8 08:07:34 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sat, 7 Apr 2007 23:07:34 -0700
Subject: [sdiy] center tapped pots?
In-Reply-To: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
Message-ID: <87441170704072307u296cae7crf1423317cdea2d86@mail.gmail.com>

On 4/7/07, peter edwards <synth at casperelectronics.com> wrote:
> Howdy y'all...
> I'm looking for a couple 100K, dual, center tapped pots and can't
> seem to find them anywhere. I found some manufacturers but no small
> quantity distributors. Anybody have any leads?
>

Tom Arnold has a whole bunch of 50K center tapped pots. They're not
dual, however.

Tim (I don't have any leads... I'm surface mount) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From tim.parkhurst at gmail.com  Sun Apr  8 08:27:07 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sat, 7 Apr 2007 23:27:07 -0700
Subject: [sdiy] CV buffer
In-Reply-To: <20070408055416.GR47569@moo.sysabend.org>
References: <20070408055416.GR47569@moo.sysabend.org>
Message-ID: <87441170704072327w11367addn4b3152d6323255ca@mail.gmail.com>

On 4/7/07, Tom Arnold <xyzzy at sysabend.org> wrote:
> I need to build a buffer so I can spread a single CV out to multiple
> destinations without cross pollination on the output side.  I'd just do a
> quick opamp buffer but I remember reading horror stories on this list of
> tiny errors being added.
>
> Any suggestions on a stable way to do this without adding noticable error?
>

Hmm, I would have thought a non-inverting follower built around a
decent op amp would be okay. If that's not good enough, how about
throwing in a few resistors and a trimmer. The only problem here is
that you need an inverting config (worst case, you might have to tweak
the trimmer and would want a gain range of just below 1 to just above
1), so now you need two op amps. Still, a dual amp package, a trimmer
and a handful of Rs isn't too bad.


Tim (signing off to go watch F1... go Ferrari!) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From xyzzy at sysabend.org  Sun Apr  8 11:18:21 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Sun, 8 Apr 2007 02:18:21 -0700
Subject: [sdiy] center tapped pots?
In-Reply-To: <87441170704072307u296cae7crf1423317cdea2d86@mail.gmail.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<87441170704072307u296cae7crf1423317cdea2d86@mail.gmail.com>
Message-ID: <20070408091821.GT47569@moo.sysabend.org>

On Sat, Apr 07, 2007 at 11:07:34PM -0700, Tim Parkhurst wrote:
> Tom Arnold has a whole bunch of 50K center tapped pots. They're not
> dual, however.

And I've been really bad about letting people know I have'em available, just
been so busy at work.  If anyone needs a handful, contact me off-list
please.  These pots are Alpha 16mm 50k center tapped.

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From frankentron at hotmail.com  Sun Apr  8 18:04:39 2007
From: frankentron at hotmail.com (Michael Ruberto)
Date: Sun, 08 Apr 2007 12:04:39 -0400
Subject: [sdiy] OT: line level shifter?
Message-ID: <BAY133-F29A624676DAC8FA6B930E3B35A0@phx.gbl>

Soon I will be picking up my new mixer. Problem here is that I just found 
out all of it's inputs are unbalanced +4 level. So I have to find or 
preferably build a level shifter that can accomodate the 20+ outputs of all 
my -10 output synths and sampler. I imagine buying something to do this will 
cost a hefty sum for this many channels. Can I just build these from 
standard op-amps?
Is there aything more significant going on here besides just a fixed gain 
cell?

Also I am curious about Active Direct Inject boxes. Anybody use them? Are 
they better/worse than passive?

M. A. Ruberto

_________________________________________________________________
Interest Rates Fall Again! $430,000 Mortgage for $1,399/mo - Calculate new 
payment 
http://www.lowermybills.com/lre/index.jsp?sourceid=lmb-9632-18679&moid=7581



From dragon.servicing at virgin.net  Sun Apr  8 19:46:16 2007
From: dragon.servicing at virgin.net (Peter Blackett)
Date: Sun, 08 Apr 2007 18:46:16 +0100
Subject: [sdiy] OT: Audio line levels
In-Reply-To: <BAY133-F29A624676DAC8FA6B930E3B35A0@phx.gbl>
References: <BAY133-F29A624676DAC8FA6B930E3B35A0@phx.gbl>
Message-ID: <46192A68.5070600@virgin.net>

Hi,
I think that some active Di boxes don't provide electrical isolation 
between the input and output (the feed to the desk). this can be a 
problem if you are trying to get rid of earth loops.
are the gains on the input channels on the  new mixer adjustable ? as it 
might be able to cope with the - 10 signal levels without being too 
noisy. Otherwise I think it would be possible to make up an amplifier to 
increase the signal level.
I think there may be a kit avaiable to do this, but I can't remember 
where I saw the details.....
Happy Holidays
regards Peter


Michael Ruberto wrote:

> Soon I will be picking up my new mixer. Problem here is that I just 
> found out all of it's inputs are unbalanced +4 level. So I have to 
> find or preferably build a level shifter that can accomodate the 20+ 
> outputs of all my -10 output synths and sampler. I imagine buying 
> something to do this will cost a hefty sum for this

> Also I am curious about Active Direct Inject boxes. Anybody use them? 
> Are they better/worse than passive?
>
> M. A. Ruberto

 


From j.l.marshall at comcast.net  Sun Apr  8 20:07:51 2007
From: j.l.marshall at comcast.net (John L Marshall)
Date: Sun, 8 Apr 2007 11:07:51 -0700
Subject: [sdiy] Hearing, Listen!
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
Message-ID: <000c01c77a08$d351d0f0$6701a8c0@cheetah>

A strange thing happened last night. The most important part of my analog 
system failed. I lost all hearing in my left ear. I can now only hear low 
level pink noise in my left ear and that is all. The emergency room doctor 
found no physical damage. He referred me to a specialist.

When I was young, I went to my share of loud concerts; i.e., Jimi Hendrix in 
N?rnberg. That may be a contributor to the failing ear.

Advice: Take care of your ears, both of them, they are the most important 
part of your analog sound system.

Take care,
John
www.sound-photo.com
www.antenna-farm.com



From frankentron at hotmail.com  Sun Apr  8 20:19:17 2007
From: frankentron at hotmail.com (Michael Ruberto)
Date: Sun, 08 Apr 2007 14:19:17 -0400
Subject: [sdiy] OT: Audio line levels
In-Reply-To: <46192A68.5070600@virgin.net>
Message-ID: <BAY133-F36FF541A25B3F517A40176B35A0@phx.gbl>

Thank you Peter, and happy holidays to you!

What I am have having to contend with is the choice between using the 
floating transformer isolated inputs or the +4 unbalanced recieve inputs. 
This is a real dinosaur:

http://i108.photobucket.com/albums/n13/somnium7/gear/ToaBoard01.jpg
http://www.toaelectronics.com/disc/manuals/RX-7-164_248_328_IM.pdf

According to the specs I have a fairly large amount of channel headroom 
(clipping at 12.3V-24dB) and there are 3 levels of padding for the tranny 
inputs (-20, -40, -60).
Do you think I will have decent performance if I use the transformer inputs 
and ground the cold pin at the instrument output?
Or will I absolutely need a DI box?


In the past I've connected -10 outputs to +4 inputs on effects boxes and 
sometimes it was very noisy and other times it didn't seem to make a 
difference.

Overall this installation will be quite a challenge with all these signals 
levels. The synths are all -10, the effects and preamps are -10, +4 
unbalanced and +4 balanced, and the sampler has a combination of +4 balanced 
and -10 outputs. Also I've never actually been exposed to gear with floating 
transformer inputs.

M. A. Ruberto

>From: Peter Blackett <dragon.servicing at virgin.net>
>To: Michael Ruberto <frankentron at hotmail.com>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] OT: Audio line levels
>Date: Sun, 08 Apr 2007 18:46:16 +0100
>
>Hi,
>I think that some active Di boxes don't provide electrical isolation 
>between the input and output (the feed to the desk). this can be a problem 
>if you are trying to get rid of earth loops.
>are the gains on the input channels on the  new mixer adjustable ? as it 
>might be able to cope with the - 10 signal levels without being too noisy. 
>Otherwise I think it would be possible to make up an amplifier to increase 
>the signal level.
>I think there may be a kit avaiable to do this, but I can't remember where 
>I saw the details.....
>Happy Holidays
>regards Peter
>
>
>Michael Ruberto wrote:
>
>>Soon I will be picking up my new mixer. Problem here is that I just found 
>>out all of it's inputs are unbalanced +4 level. So I have to find or 
>>preferably build a level shifter that can accomodate the 20+ outputs of 
>>all my -10 output synths and sampler. I imagine buying something to do 
>>this will cost a hefty sum for this
>
>>Also I am curious about Active Direct Inject boxes. Anybody use them? Are 
>>they better/worse than passive?
>>
>>M. A. Ruberto
>
>

_________________________________________________________________
Need a break? Find your escape route with Live Search Maps. 
http://maps.live.com/?icid=hmtag3



From debus at cityweb.de  Sun Apr  8 20:54:51 2007
From: debus at cityweb.de (Ingo Debus)
Date: Sun, 8 Apr 2007 20:54:51 +0200
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <000c01c77a08$d351d0f0$6701a8c0@cheetah>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
	<000c01c77a08$d351d0f0$6701a8c0@cheetah>
Message-ID: <36EE3029-DB42-41EC-BF1D-484CDB4C2F48@cityweb.de>


Am 08.04.2007 um 20:07 schrieb John L Marshall:

> A strange thing happened last night. The most important part of my  
> analog system failed. I lost all hearing in my left ear. I can now  
> only hear low level pink noise in my left ear and that is all. The  
> emergency room doctor found no physical damage. He referred me to a  
> specialist.

I'm not a doctor, but this sounds like "idiopathic sudden  
sensorineural hearing loss". Just had a quick look at Wikipedia (long  
article there), one reason can be psychical stress. Being exposed to  
loud noise a long time ago is not mentioned as a reason. Best thing  
you could do is see a doctor immediately.

Do you smoke? If yes, time to quit it now.

Hope you're getting better soon!

Ingo




From rtellason at verizon.net  Sun Apr  8 21:47:03 2007
From: rtellason at verizon.net (Roy J. Tellason)
Date: Sun, 08 Apr 2007 15:47:03 -0400
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <000c01c77a08$d351d0f0$6701a8c0@cheetah>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
	<000c01c77a08$d351d0f0$6701a8c0@cheetah>
Message-ID: <200704081547.03752.rtellason@verizon.net>

On Sunday 08 April 2007 14:07, John L Marshall wrote:
> A strange thing happened last night. The most important part of my analog
> system failed. I lost all hearing in my left ear. I can now only hear low
> level pink noise in my left ear and that is all. The emergency room doctor
> found no physical damage. He referred me to a specialist.
>
> When I was young, I went to my share of loud concerts; i.e., Jimi Hendrix
> in N?rnberg. That may be a contributor to the failing ear.
>
> Advice: Take care of your ears, both of them, they are the most important
> part of your analog sound system.

Was this that abrupt a thing?  I've never heard of that happening...

Having some hearing loss,  I can readily concur with your post.

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin



From thescum at surfree.com  Sun Apr  8 22:22:36 2007
From: thescum at surfree.com (Byron G. Jacquot)
Date: Sun, 8 Apr 2007 13:22:36 -0700 (GMT-07:00)
Subject: [sdiy] OT: Audio line levels
Message-ID: <24646555.1176063756209.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>

>Thank you Peter, and happy holidays to you!
>
>What I am have having to contend with is the choice between using the 
>floating transformer isolated inputs or the +4 unbalanced recieve inputs. 
>This is a real dinosaur:
>
>http://i108.photobucket.com/albums/n13/somnium7/gear/ToaBoard01.jpg
>http://www.toaelectronics.com/disc/manuals/RX-7-164_248_328_IM.pdf
>
>According to the specs I have a fairly large amount of channel headroom 
>(clipping at 12.3V-24dB) and there are 3 levels of padding for the tranny 
>inputs (-20, -40, -60).
>Do you think I will have decent performance if I use the transformer inputs 
>and ground the cold pin at the instrument output?
>Or will I absolutely need a DI box?

How much of a dinosaur is this?  Is it old enough that there's some room in the chassis to as some new circuitry?  And is technology under the hood something you could reverse engineer?  Those transformer-isolated inputs are designed for microphones, not line outputs, and have a rather low input impedance...the 1.2K and 1.7K settings are on the edge of hostility to some output stages.

If it's a common transformer into non-inverting opamp stage, one way to add a line input is to add a jack that bypasses the transformer, feeding the input opamp.  This also avoids the possibility of accidentally putting phantom power into a synth output.  The jack could be a switching one, so it bypasses the transformer input, or you could add a toggle switch.

Of course, the RCV jack is already built out to 20K input impedance, so it's maybe a better place to interface.

If you'd rather not mod the thing, hunt around (Ebay...) for a "bump box," -10 to +4 converter.  They're pretty common in broadcast installations, because most broadcast gear is strictly +4, but -10 front end gear is becoming more & more common.  ART and Henry Engineering are two vendors I can think of right now.

>In the past I've connected -10 outputs to +4 inputs on effects boxes and 
>sometimes it was very noisy and other times it didn't seem to make a 
>difference.

Do you know the input impedances?  Many solid-state outputs get noisy when asked to drive a 600-ohm input.

Also, correctly balancing & unbalancing can prevent some noise headaches...but needs to be handled on a case-by-case basis, depending on the type of circuit.

Byron Jacquot


From frankentron at hotmail.com  Sun Apr  8 22:55:39 2007
From: frankentron at hotmail.com (Michael Ruberto)
Date: Sun, 08 Apr 2007 16:55:39 -0400
Subject: [sdiy] OT: Audio line levels
In-Reply-To: <24646555.1176063756209.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>
Message-ID: <BAY133-F5FFFE12A33D118F9A05D1B35A0@phx.gbl>

Byron,

>How much of a dinosaur is this?  Is it old enough that there's some room in 
>the chassis to as some new circuitry?  And is technology under the hood 
>something you could reverse engineer?  Those transformer-isolated inputs 
>are designed for microphones, not line outputs, and have a rather low input 
>impedance...the 1.2K and 1.7K settings are on the edge of hostility to some 
>output stages.
>

The specs show 1.2K to 1.7K on the transformer inputs. This will be a 
problem since the unbalanced outs of my synths need to go into an input with 
a much higher impedance.
I don't have the mixer home yet, I'm picking it up tomorrow so I can't say 
how much room there is inside. It's physically a large beast at over 66 
inches long and 34" deep. The channels can be removed individually too so I 
think modding should be possible. I'm not certain but I think the unit is 
from the late 70s or early 80s so I imagine the circuitry is pretty basic 
with mostly discreet design. Should be easy to reverse engineer. Or at least 
as hard as my 1975 Hammond spinet that I hot- rodded.

>If it's a common transformer into non-inverting opamp stage, one way to add 
>a line input is to add a jack that bypasses the transformer, feeding the 
>input opamp.  This also avoids the possibility of accidentally putting 
>phantom power into a synth output.  The jack could be a switching one, so 
>it bypasses the transformer input, or you could add a toggle switch.
>

This could work but if the gain switches employ the old opamp in the 
feedback loop of the input opamp I may have probs with impedance again.

>Of course, the RCV jack is already built out to 20K input impedance, so 
>it's maybe a better place to interface.
>

I agree. This is what I'll try first.

>If you'd rather not mod the thing, hunt around (Ebay...) for a "bump box," 
>-10 to +4 converter.  They're pretty common in broadcast installations, 
>because most broadcast gear is strictly +4, but -10 front end gear is 
>becoming more & more common.  ART and Henry Engineering are two vendors I 
>can think of right now.
>

I've looked up some of these and it won't be financially feasable for me to 
buy the quantity I'll need for all the outputs of my gear. The cost will be 
more than I paid for the mixer itself. I may buy one and reverse engineer it 
so I may then build my own multi-channel version. I'll be needing at least 
24 channels.


M. A. Ruberto

>
>Do you know the input impedances?  Many solid-state outputs get noisy when 
>asked to drive a 600-ohm input.
>

>Also, correctly balancing & unbalancing can prevent some noise 
>headaches...but needs to be handled on a case-by-case basis, depending on 
>the type of circuit.
>
>Byron Jacquot
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Exercise your brain! Try Flexicon. 
http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07



From ebrombaugh at earthlink.net  Sun Apr  8 22:55:49 2007
From: ebrombaugh at earthlink.net (Eric Brombaugh)
Date: Sun, 8 Apr 2007 13:55:49 -0700
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <000c01c77a08$d351d0f0$6701a8c0@cheetah>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
	<000c01c77a08$d351d0f0$6701a8c0@cheetah>
Message-ID: <f8629a6679cdeaf6399d05ecf2c5b119@earthlink.net>


On Apr 8, 2007, at 11:07 AM, John L Marshall wrote:

> A strange thing happened last night. The most important part of my 
> analog system failed. I lost all hearing in my left ear. I can now 
> only hear low level pink noise in my left ear and that is all. The 
> emergency room doctor found no physical damage. He referred me to a 
> specialist.
>

John,

Something like this has happened to me several times over the last 15 
years or so. Typically I'll get a feeling of fullness in one ear and a 
loss of high frequency sensitivity, sometimes accompanied by a 
low-pitched roaring sound. The sensation is very similar to having 
water in my ear. In every case it has faded away over the course of a 
few weeks and my hearing has returned to normal.

I've had fairly strong tinnitus for as long as I can remember - I'm not 
sure if it's related.

Hope for the best!

Eric




From billbigrig at yahoo.com  Sun Apr  8 22:56:31 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Sun, 8 Apr 2007 13:56:31 -0700 (PDT)
Subject: [sdiy] OT;synth line levels
Message-ID: <752403.90523.qm@web32714.mail.mud.yahoo.com>

Howdy,

 if you poke around the books of craig Anderton or
Paia.com, you will at least get a pointer in the
general direction you need to go. Which is line level
+10 or -4. I don't remember. It shouldn't be a hard
build. even for 10 channaels.
Rig


 
____________________________________________________________________________________
Get your own web address.  
Have a HUGE year through Yahoo! Small Business.
http://smallbusiness.yahoo.com/domains/?p=BESTDEAL


From billbigrig at yahoo.com  Sun Apr  8 23:11:36 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Sun, 8 Apr 2007 14:11:36 -0700 (PDT)
Subject: [sdiy] OT: adio line levels
Message-ID: <102466.22689.qm@web32710.mail.mud.yahoo.com>

Howdy,

 Yes,i worked with a Yamaha mixer with this same
problem. Radio shack makes a direct plug in adaptor
for $15. Guitar player books has a book called Prjects
for musicians that is choc-a-bloc with circuits. Also,
paia makes some dandy kits to get in there. Some are
tube preamps. most are not difficult.
rig


 
____________________________________________________________________________________
Now that's room service!  Choose from over 150,000 hotels
in 45,000 destinations on Yahoo! Travel to find your fit.
http://farechase.yahoo.com/promo-generic-14795097


From matthias.herrmann at fonik.de  Sun Apr  8 23:28:02 2007
From: matthias.herrmann at fonik.de (Matthias Herrmann)
Date: Sun, 8 Apr 2007 23:28:02 +0200
Subject: [sdiy] getting all post twice!?
Message-ID: <LNEMJLLDOIOKMLNOFFNDKEOLCGAA.matthias.herrmann@fonik.de>

hi all,
since the new list is active i get all posts twice!
i unsubscribed (yes, it worked!!!! - i did not receive any mail for a whole
day!!!) and did a new subscription with the same result: i get all posts
twice...
anybody with same or similiar experience?

cheers,
matthias herrmann
www.modular.fonik.de



From ijfritz at comcast.net  Mon Apr  9 00:44:12 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Sun, 08 Apr 2007 16:44:12 -0600
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <200704081547.03752.rtellason@verizon.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
	<000c01c77a08$d351d0f0$6701a8c0@cheetah>
	<200704081547.03752.rtellason@verizon.net>
Message-ID: <6.2.1.2.2.20070408164253.020a76b0@mail.comcast.net>

At 01:47 PM 4/8/2007, Roy J. Tellason wrote:
>On Sunday 08 April 2007 14:07, John L Marshall wrote:
> > A strange thing happened last night. The most important part of my analog
> > system failed. I lost all hearing in my left ear. I can now only hear low
> > level pink noise in my left ear and that is all. The emergency room doctor
> > found no physical damage. He referred me to a specialist.
> >
> > When I was young, I went to my share of loud concerts; i.e., Jimi Hendrix
> > in N?rnberg. That may be a contributor to the failing ear.
> >
> > Advice: Take care of your ears, both of them, they are the most important
> > part of your analog sound system.
>
>Was this that abrupt a thing?  I've never heard of that happening...

Oh yes, this can happen. It happened to my daughter a year ago.  They gave 
her steroids and it came back OK.  Very scarry!

   Ian 




From lanterma at ece.gatech.edu  Mon Apr  9 01:28:39 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Sun, 8 Apr 2007 19:28:39 -0400 (EDT)
Subject: [sdiy] sdiy v/f f/v etc.
In-Reply-To: <386744.99669.qm@web32707.mail.mud.yahoo.com>
References: <386744.99669.qm@web32707.mail.mud.yahoo.com>
Message-ID: <Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>


On Sat, 7 Apr 2007, bill bigrig wrote:

> If you are going for a pitch to control voltage
> module, go to mark.godfrey at gatech.edu. Ask for
> "ECE4803 final project". I am holding in my hand his
> design that uses a LM2917N and a quad TL084, and a
> CA3046 along with some odds and ends to make one. It

You can find that here

http://users.ece.gatech.edu/~lanterma/studentprojects/

One of these days I'll get around to posting the projects from the Fall 
2006 offering...

- Aaron


From pata at ieee.org  Mon Apr  9 02:18:49 2007
From: pata at ieee.org (Takuya Katayama)
Date: Mon, 9 Apr 2007 09:18:49 +0900 (JST)
Subject: [sdiy] CV buffer
In-Reply-To: <20070408055416.GR47569@moo.sysabend.org>
Message-ID: <20070409001849.24301.qmail@web2810.mail.bbt.yahoo.co.jp>

Hi Tom and friends!

Long time ago (1976-77) I made active CV "multi-tap".
I and my companies were also afraid of the problems that
Tom wrote.
To avoide the problems, we used LM312 (internally
compensated LM308) for buffer OP amps, and got good
perfomance.
Other day we test 741 in place of 312 and a little
difference, but good enough.
Difference was only DC offset voltage.
312-->0.3mV
741-->2mV
So I recommend some lowcost precision OPAs, such as OP07 
or its families.
Use protective resistors between output pin to neative
input(1-2kohm), 470ohm in series to output terminal.
 
I think 324/2904, 074 are NOT recomended.

===
Takuya KATAYAMA
Muse Music Synthesizer Lab., Tokyo.

--- Tom Arnold <xyzzy at sysabend.org> wrote:

> I need to build a buffer so I can spread a single CV
> out to multiple
> destinations without cross pollination on the output
> side.  I'd just do a
> quick opamp buffer but I remember reading horror
> stories on this list of
> tiny errors being added.
> 
> Any suggestions on a stable way to do this without
> adding noticable error?
> 
> -- 
> 
>
-----------------------------------------------------------------
>  - Tom Arnold       -  Free Synth DIY webspace
> http://www.sdiy.org 
>  - SynthGeek        -
>  - BBD Fanatic      -  "...is it a virus, a drug, or
> a religion?" 
>  - echo evho wjxo   -    Juanita Shrugs. "What's the
> difference?" 
>  --------------------  
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 



From dlmanley at sonic.net  Mon Apr  9 02:45:21 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Sun, 08 Apr 2007 17:45:21 -0700
Subject: [sdiy] sdiy v/f f/v etc.
In-Reply-To: <Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>
References: <386744.99669.qm@web32707.mail.mud.yahoo.com>
	<Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>
Message-ID: <46198CA1.4000800@sonic.net>


> One of these days I'll get around to posting the projects from the 
> Fall 2006 offering...
>
> - Aaron
Simple solution: next time require the students do it as part of their 
project :-)

-Dave


From abisset at dspaudio.com  Mon Apr  9 03:35:23 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Sun, 8 Apr 2007 18:35:23 -0700 (PDT)
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <f8629a6679cdeaf6399d05ecf2c5b119@earthlink.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
	<000c01c77a08$d351d0f0$6701a8c0@cheetah>
	<f8629a6679cdeaf6399d05ecf2c5b119@earthlink.net>
Message-ID: <Pine.LNX.4.58.0704081824200.2797@fourier>


I'm concerned to learn of your sudden hearing loss.

I would suggest meditation.  Your mileage *will* vary, but often times I
can tune tinnitus out within a few seconds.  If I don't make an
attempt it can last up to an hour.  I understand your situation is more
serious than tinnitus, but getting clock signals synched up between your
neurons couldn't be a bad thing.  (My intuition says my tinnitus happens
when the nerve polling rate changes causing a desync.. the high pitched
whine being the raw nerve polling rate.)

This brings up a most interesting study:

http://science.slashdot.org/article.pl?sid=07/03/10/0328217&from=rss

Get lots of sleep if you can it's powerful medicine.

Take care and good luck!
-anthony



From sdiy at oveloe.com  Mon Apr  9 04:05:48 2007
From: sdiy at oveloe.com (Charles Bisaillon)
Date: Sun, 08 Apr 2007 22:05:48 -0400
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <6.2.1.2.2.20070408164253.020a76b0@mail.comcast.net>
Message-ID: <C23F17BC.A1CD%sdiy@oveloe.com>

Le 4/8/07 6:44 PM, ??Ian Fritz?? <ijfritz at comcast.net> a ?crit?:

> At 01:47 PM 4/8/2007, Roy J. Tellason wrote:
>> On Sunday 08 April 2007 14:07, John L Marshall wrote:
>>> A strange thing happened last night. The most important part of my analog
>>> system failed. I lost all hearing in my left ear. I can now only hear low
>>> level pink noise in my left ear and that is all. The emergency room doctor
>>> found no physical damage. He referred me to a specialist.
>>> 
>>> When I was young, I went to my share of loud concerts; i.e., Jimi Hendrix
>>> in N?rnberg. That may be a contributor to the failing ear.
>>> 
>>> Advice: Take care of your ears, both of them, they are the most important
>>> part of your analog sound system.

First of all we all should know that your ears are actually digital in
nature. Impulses of tiny hairs in the cochlea are sending 1s and 0s to your
brain...

>> 
>> Was this that abrupt a thing?  I've never heard of that happening...
> 
> Oh yes, this can happen. It happened to my daughter a year ago.  They gave
> her steroids and it came back OK.  Very scarry!

Maybe try ginseng, it's a natural steroid...

Good luck!

Charles





From abisset at dspaudio.com  Mon Apr  9 08:28:53 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Sun, 8 Apr 2007 23:28:53 -0700 (PDT)
Subject: [sdiy] tongue stuck to skipole
In-Reply-To: <Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>
References: <386744.99669.qm@web32707.mail.mud.yahoo.com>
	<Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>
Message-ID: <Pine.LNX.4.58.0704082323220.10687@fourier>


Before this happens to me, I figured I'd ask:

Is there any reason I couldn't run serge at +/-15v?

I'm not concerned with 1v/octave tracking.  (i prefer to tune each CV as
i'm playing, it affords more interesting scales so i actually pulled all
the fixed 1v/octave inputs off the front panel and tied them together at a
single input for a sort of pol-pot attack, ie, when i get bored
i can modulate all modules).

There was some discussion of this recently indicating i might need to
amplify this MEGAMULT signal, but because i'm living on the un-impeded
lifestyle, does it really matter?

unorthodox cheers, feet kicking mud at sky.
-anthony



 On Sun, 8 Apr 2007, Aaron Lanterman wrote:

>
> On Sat, 7 Apr 2007, bill bigrig wrote:
>
> > If you are going for a pitch to control voltage
> > module, go to mark.godfrey at gatech.edu. Ask for
> > "ECE4803 final project". I am holding in my hand his
> > design that uses a LM2917N and a quad TL084, and a
> > CA3046 along with some odds and ends to make one. It
>
> You can find that here
>
> http://users.ece.gatech.edu/~lanterma/studentprojects/
>
> One of these days I'll get around to posting the projects from the Fall
> 2006 offering...
>
> - Aaron
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From cynthia.webster at gte.net  Mon Apr  9 08:59:22 2007
From: cynthia.webster at gte.net (Cynthia Webster)
Date: Sun, 08 Apr 2007 23:59:22 -0700
Subject: [sdiy] tongue stuck to skipole
In-Reply-To: <Pine.LNX.4.58.0704082323220.10687@fourier>
References: <386744.99669.qm@web32707.mail.mud.yahoo.com>
	<Pine.GSO.4.60.0704081925220.14182@bigzilla.ece.gatech.edu>
	<Pine.LNX.4.58.0704082323220.10687@fourier>
Message-ID: <4619E44A.3090508@gte.net>

I've had success doing this on a limited basis, "up-voting" selected 
vintage Serge PCBs,
but I've never done this with a whole panel before.

I suggest that you examine each and every integrated circuit on the 
specific Serge panel boards
and do diligent research by actually looking-up the spec sheet of the 
chips that you have installed
to makes sure that they can handle the extra voltage.  (Each chip 
species often has several variations
coded after the part number with alphabet letters and I would look at 
these carefully to be sure.

Instead of simply reading "TL072", you would examine the entire 
"TL072BCD"  for example.
(You will probably have better luck with this with newer panels than 
with old, do you think?)

Also, many "15 Volt" supplies have a pair of trim pots for precise 
adjustment and it may be
quite possible for you to attached a simple voltmeter to the outputs and 
then trim them down
from +/-15 volts to +/-12, (thus rendering the afore mentioned question 
rather moot).

BTW, the Mark Godfry update/replacement for the defunct but oh so lovely 
Gentle Electric
Pitch to Voltage Converter module looks pretty niffy in it's own right, 
thanks Aaron!

peace


Cyn


http://www.cyndustries.com/



Anthony Bisset wrote:
> Before this happens to me, I figured I'd ask:
>
> Is there any reason I couldn't run serge at +/-15v?
>
> I'm not concerned with 1v/octave tracking.  (i prefer to tune each CV as
> i'm playing, it affords more interesting scales so i actually pulled all
> the fixed 1v/octave inputs off the front panel and tied them together at a
> single input for a sort of pol-pot attack, ie, when i get bored
> i can modulate all modules).
>
> There was some discussion of this recently indicating i might need to
> amplify this MEGAMULT signal, but because i'm living on the un-impeded
> lifestyle, does it really matter?
>
> unorthodox cheers, feet kicking mud at sky.
> -anthony
>
>
>
>  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
>
>   
>> On Sat, 7 Apr 2007, bill bigrig wrote:
>>
>>     
>>> If you are going for a pitch to control voltage
>>> module, go to mark.godfrey at gatech.edu. Ask for
>>> "ECE4803 final project". I am holding in my hand his
>>> design that uses a LM2917N and a quad TL084, and a
>>> CA3046 along with some odds and ends to make one. It
>>>       
>> You can find that here
>>
>> http://users.ece.gatech.edu/~lanterma/studentprojects/
>>
>> One of these days I'll get around to posting the projects from the Fall
>> 2006 offering...
>>
>> - Aaron
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>     
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>   



From sasami at hotkey.net.au  Mon Apr  9 09:40:25 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Mon,  9 Apr 2007 17:40:25 +1000 (EST)
Subject: [sdiy] tongue stuck to skipole
Message-ID: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au>

Quite frankly, I cannot see any reason why it would not work, though for
modules like the WAD, or that PEF with potted parts, I'd do as Cynthia
suggests and check that those hard to get chips are capable of running at
the higher voltage, or in the case of the latter, stay with +/-12V. 

CD40XX, CD45XX, MC140XX etc. CMOS chips will be fine. Op amps will be fine.
The most "delicate" of the op-amps is the MC3401 which is only rated for
+18V, but as it is only ever run across the positive supply, it wouldn't be
a problem. I'm not sure they were even used in the later versions. 

Still, you do so AT YOUR OWN RISK.

Ken

>I've had success doing this on a limited basis, "up-voting" selected 
>vintage Serge PCBs,
>but I've never done this with a whole panel before.
>
>I suggest that you examine each and every integrated circuit on the 
>specific Serge panel boards
>and do diligent research by actually looking-up the spec sheet of the 
>chips that you have installed
>to makes sure that they can handle the extra voltage.  (Each chip 
>species often has several variations
>coded after the part number with alphabet letters and I would look at 
>these carefully to be sure.
>
>Instead of simply reading "TL072", you would examine the entire 
>"TL072BCD"  for example.
>(You will probably have better luck with this with newer panels than 
>with old, do you think?)
>
>Also, many "15 Volt" supplies have a pair of trim pots for precise 
>adjustment and it may be
>quite possible for you to attached a simple voltmeter to the outputs and 
>then trim them down
>from +/-15 volts to +/-12, (thus rendering the afore mentioned question 
>rather moot).
>
>BTW, the Mark Godfry update/replacement for the defunct but oh so lovely 
>Gentle Electric
>Pitch to Voltage Converter module looks pretty niffy in it's own right, 
>thanks Aaron!
>
>peace
>
>
>Cyn
>
>
>http://www.cyndustries.com/
>
>
>
>Anthony Bisset wrote:
>> Before this happens to me, I figured I'd ask:
>>
>> Is there any reason I couldn't run serge at +/-15v?
>>
>> I'm not concerned with 1v/octave tracking.  (i prefer to tune each CV as
>> i'm playing, it affords more interesting scales so i actually pulled all
>> the fixed 1v/octave inputs off the front panel and tied them together at a
>> single input for a sort of pol-pot attack, ie, when i get bored
>> i can modulate all modules).
>>
>> There was some discussion of this recently indicating i might need to
>> amplify this MEGAMULT signal, but because i'm living on the un-impeded
>> lifestyle, does it really matter?
>>
>> unorthodox cheers, feet kicking mud at sky.
>> -anthony
>>
>>
>>
>>  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
>>
>>   
>>> On Sat, 7 Apr 2007, bill bigrig wrote:
>>>
>>>     
>>>> If you are going for a pitch to control voltage
>>>> module, go to mark.godfrey at gatech.edu. Ask for
>>>> "ECE4803 final project". I am holding in my hand his
>>>> design that uses a LM2917N and a quad TL084, and a
>>>> CA3046 along with some odds and ends to make one. It
>>>>       
>>> You can find that here
>>>
>>> http://users.ece.gatech.edu/~lanterma/studentprojects/
>>>
>>> One of these days I'll get around to posting the projects from the Fall
>>> 2006 offering...
>>>
>>> - Aaron
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>>     
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>   
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From dougt55 at yahoo.com  Mon Apr  9 09:44:32 2007
From: dougt55 at yahoo.com (Doug Terrebonne)
Date: Mon, 9 Apr 2007 00:44:32 -0700 (PDT)
Subject: [sdiy] tongue stuck to skipole
In-Reply-To: <4619E44A.3090508@gte.net>
Message-ID: <765563.53356.qm@web81202.mail.mud.yahoo.com>

Yes if you have the power supplies from STS they are standard
Condor/Power One HAA/HBB/HCC series supples and have internal trimmers
to adjust the output voltages up to +/-15v...

--- Cynthia Webster <cynthia.webster at gte.net> wrote:

> I've had success doing this on a limited basis, "up-voting" selected 
> vintage Serge PCBs,
> but I've never done this with a whole panel before.
> 
> I suggest that you examine each and every integrated circuit on the 
> specific Serge panel boards
> and do diligent research by actually looking-up the spec sheet of the
> 
> chips that you have installed
> to makes sure that they can handle the extra voltage.  (Each chip 
> species often has several variations
> coded after the part number with alphabet letters and I would look at
> 
> these carefully to be sure.
> 
> Instead of simply reading "TL072", you would examine the entire 
> "TL072BCD"  for example.
> (You will probably have better luck with this with newer panels than 
> with old, do you think?)
> 
> Also, many "15 Volt" supplies have a pair of trim pots for precise 
> adjustment and it may be
> quite possible for you to attached a simple voltmeter to the outputs
> and 
> then trim them down
> from +/-15 volts to +/-12, (thus rendering the afore mentioned
> question 
> rather moot).
> 
> BTW, the Mark Godfry update/replacement for the defunct but oh so
> lovely 
> Gentle Electric
> Pitch to Voltage Converter module looks pretty niffy in it's own
> right, 
> thanks Aaron!
> 
> peace
> 
> 
> Cyn
> 
> 
> http://www.cyndustries.com/
> 
> 
> 
> Anthony Bisset wrote:
> > Before this happens to me, I figured I'd ask:
> >
> > Is there any reason I couldn't run serge at +/-15v?
> >
> > I'm not concerned with 1v/octave tracking.  (i prefer to tune each
> CV as
> > i'm playing, it affords more interesting scales so i actually
> pulled all
> > the fixed 1v/octave inputs off the front panel and tied them
> together at a
> > single input for a sort of pol-pot attack, ie, when i get bored
> > i can modulate all modules).
> >
> > There was some discussion of this recently indicating i might need
> to
> > amplify this MEGAMULT signal, but because i'm living on the
> un-impeded
> > lifestyle, does it really matter?
> >
> > unorthodox cheers, feet kicking mud at sky.
> > -anthony
> >
> >
> >
> >  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
> >
> >   
> >> On Sat, 7 Apr 2007, bill bigrig wrote:
> >>
> >>     
> >>> If you are going for a pitch to control voltage
> >>> module, go to mark.godfrey at gatech.edu. Ask for
> >>> "ECE4803 final project". I am holding in my hand his
> >>> design that uses a LM2917N and a quad TL084, and a
> >>> CA3046 along with some odds and ends to make one. It
> >>>       
> >> You can find that here
> >>
> >> http://users.ece.gatech.edu/~lanterma/studentprojects/
> >>
> >> One of these days I'll get around to posting the projects from the
> Fall
> >> 2006 offering...
> >>
> >> - Aaron
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >>     
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> >   
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From sounddoctorin at imt.net  Mon Apr  9 12:18:44 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 09 Apr 2007 03:18:44 -0700
Subject: [sdiy] JRC 2090D anyone have specs? casio used these..
Message-ID: <461A1304.2050205@imt.net>

Just curious.  Until recently I was totally unaware that casio actually 
built an analog synth!  The HZ/HT series have analog filters in them and 
are fully programmable for the filter, LFO, DCO.  Appear to be two 
filters; one for chords and one for melody part.  I put a drum pattern 
on and played some stuff..hehe..these little things aren't bad at all!  
Very inspiring.  I'll have to do some renditions of some of my 80's 
songs on it.  It's a mini key one I got for 70 bucks on ebay.  Right 
after the CZ series in '87 or like that is the date on them.  Internal 
speakers, 8 voice poly, limited memory but good for a few backbone 
tracks in the quick and easy department I can see right away :-)  That 
pays for my curiousity.  The 2090's appear to be dual OTA's at least...a 
string of 4 .05uF caps on one side etc.  Nice sounding filters really.  
I'll try to get some sound samples up in the near future again.  I have 
too many new machines here that aren't on my page.  -Bob


From samppa.tolvanen at gmail.com  Mon Apr  9 13:42:13 2007
From: samppa.tolvanen at gmail.com (Samppa Tolvanen)
Date: Mon, 9 Apr 2007 14:42:13 +0300
Subject: [sdiy] JRC 2090D anyone have specs? casio used these..
In-Reply-To: <461A1304.2050205@imt.net>
References: <461A1304.2050205@imt.net>
Message-ID: <fa1b0bd80704090442x62122259x89b41e69191c438e@mail.gmail.com>

Hi.

JRC 2090D is more likely a custom filter chip design for Casio.

I was involved in a modification, where cutoff and resonance of the
chip were brought under external CV control.

It turned HT-3000 into a different kind of animal with very brutal
filter sweeps and resonant zaps - highly recommended.

I can ask, if my friend still has the service manual pdf.

Samppa

p.s. I think one of the earlier Casiotones was even more of "a proper
analog" synth.. with that Knobby feelin'


From abisset at dspaudio.com  Mon Apr  9 13:50:04 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Mon, 9 Apr 2007 04:50:04 -0700 (PDT)
Subject: [sdiy] tongue stuck to skipole @20v
In-Reply-To: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au>
References: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au>
Message-ID: <Pine.LNX.4.58.0704090443210.32598@fourier>

Bert or Marc of synton suggested I run my fenix at 20v.. yeazzz that's
right, 20v.  I was surprised.  I know 18v is max for a lot of ic's so I
only barely pushed it over at 18.7v. Was fine.  Felt like I was taking a
risk.  Anyway, guess you can run a fenix on 20v.

I do have a Gentle Electric P/V in the serge and I'm probably most worried
about that having trouble with 15v.  Anyway the reason I'm considering
this is that A, it might increase the signal levels slightly across the
system and B, I wouldn't have to mess with a second power supply for the
Driscoll that resides in this portable setup.

-a

On Mon, 9 Apr 2007, Ken Stone wrote:

> Quite frankly, I cannot see any reason why it would not work, though for
> modules like the WAD, or that PEF with potted parts, I'd do as Cynthia
> suggests and check that those hard to get chips are capable of running at
> the higher voltage, or in the case of the latter, stay with +/-12V.
>
> CD40XX, CD45XX, MC140XX etc. CMOS chips will be fine. Op amps will be fine.
> The most "delicate" of the op-amps is the MC3401 which is only rated for
> +18V, but as it is only ever run across the positive supply, it wouldn't be
> a problem. I'm not sure they were even used in the later versions.
>
> Still, you do so AT YOUR OWN RISK.
>
> Ken
>
> >I've had success doing this on a limited basis, "up-voting" selected
> >vintage Serge PCBs,
> >but I've never done this with a whole panel before.
> >
> >I suggest that you examine each and every integrated circuit on the
> >specific Serge panel boards
> >and do diligent research by actually looking-up the spec sheet of the
> >chips that you have installed
> >to makes sure that they can handle the extra voltage.  (Each chip
> >species often has several variations
> >coded after the part number with alphabet letters and I would look at
> >these carefully to be sure.
> >
> >Instead of simply reading "TL072", you would examine the entire
> >"TL072BCD"  for example.
> >(You will probably have better luck with this with newer panels than
> >with old, do you think?)
> >
> >Also, many "15 Volt" supplies have a pair of trim pots for precise
> >adjustment and it may be
> >quite possible for you to attached a simple voltmeter to the outputs and
> >then trim them down
> >from +/-15 volts to +/-12, (thus rendering the afore mentioned question
> >rather moot).
> >
> >BTW, the Mark Godfry update/replacement for the defunct but oh so lovely
> >Gentle Electric
> >Pitch to Voltage Converter module looks pretty niffy in it's own right,
> >thanks Aaron!
> >
> >peace
> >
> >
> >Cyn
> >
> >
> >http://www.cyndustries.com/
> >
> >
> >
> >Anthony Bisset wrote:
> >> Before this happens to me, I figured I'd ask:
> >>
> >> Is there any reason I couldn't run serge at +/-15v?
> >>
> >> I'm not concerned with 1v/octave tracking.  (i prefer to tune each CV as
> >> i'm playing, it affords more interesting scales so i actually pulled all
> >> the fixed 1v/octave inputs off the front panel and tied them together at a
> >> single input for a sort of pol-pot attack, ie, when i get bored
> >> i can modulate all modules).
> >>
> >> There was some discussion of this recently indicating i might need to
> >> amplify this MEGAMULT signal, but because i'm living on the un-impeded
> >> lifestyle, does it really matter?
> >>
> >> unorthodox cheers, feet kicking mud at sky.
> >> -anthony
> >>
> >>
> >>
> >>  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
> >>
> >>
> >>> On Sat, 7 Apr 2007, bill bigrig wrote:
> >>>
> >>>
> >>>> If you are going for a pitch to control voltage
> >>>> module, go to mark.godfrey at gatech.edu. Ask for
> >>>> "ECE4803 final project". I am holding in my hand his
> >>>> design that uses a LM2917N and a quad TL084, and a
> >>>> CA3046 along with some odds and ends to make one. It
> >>>>
> >>> You can find that here
> >>>
> >>> http://users.ece.gatech.edu/~lanterma/studentprojects/
> >>>
> >>> One of these days I'll get around to posting the projects from the Fall
> >>> 2006 offering...
> >>>
> >>> - Aaron
> >>> _______________________________________________
> >>> Synth-diy mailing list
> >>> Synth-diy at dropmix.xs4all.nl
> >>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >>
> >
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> _______________________________________________________________________
> Ken Stone   sasami at hotkey.net.au
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From pfperry at melbpc.org.au  Mon Apr  9 14:07:01 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Mon, 9 Apr 2007 22:07:01 +1000
Subject: [sdiy] tongue stuck to skipole @20v
References: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704090443210.32598@fourier>
Message-ID: <005d01c77a9f$94eb8440$5401a8c0@frostwave>

It's so easy to use a couple of regulators to get
+-12 from +-15 !
that's what I'd do.
Even easier, a couple of 3v zeners, one  in each
power line.
With old gear I'd be worried about tantalum filter caps
being on the edge of destruction as well.....

paul perry Melbourne Australia




From sasami at hotkey.net.au  Mon Apr  9 14:43:23 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Mon,  9 Apr 2007 22:43:23 +1000 (EST)
Subject: [sdiy] tongue stuck to skipole @20v
Message-ID: <20070409124323.77F0D8BC30F@mailout2.hotkey.net.au>

>Bert or Marc of synton suggested I run my fenix at 20v.. yeazzz that's
>right, 20v.  I was surprised.  I know 18v is max for a lot of ic's so I
>only barely pushed it over at 18.7v. Was fine.  Felt like I was taking a
>risk.  Anyway, guess you can run a fenix on 20v.

Fenix has, as far as I understand, regulators on each and every module, so
the chips never see the additional voltage. The chips would most likely be
on +/-15 just like most other synths.

>I do have a Gentle Electric P/V in the serge and I'm probably most worried
>about that having trouble with 15v.  Anyway the reason I'm considering
>this is that A, it might increase the signal levels slightly across the
>system and B, I wouldn't have to mess with a second power supply for the
>Driscoll that resides in this portable setup.

I run my Driscoll on +/-12 volts, +6 volts from the same supply as my Serge.

Ken

_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From daugard at sprintmail.com  Mon Apr  9 15:19:27 2007
From: daugard at sprintmail.com (Tim Daugard)
Date: Mon, 9 Apr 2007 08:19:27 -0500
Subject: [sdiy] tongue stuck to skipole @20v
References: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au><Pine.LNX.4.58.0704090443210.32598@fourier>
	<005d01c77a9f$94eb8440$5401a8c0@frostwave>
Message-ID: <003f01c77aa9$b43e6c40$448cfe04@tim3>

From: "Paul Perry" <pfperry at melbpc.org.au>

> It's so easy to use a couple of regulators to get
> +-12 from +-15 !

Actually finding regulators that work with only a 3 volt headroom is not that easy. High
current low dropout regulators aren't all that cheap or easy to find. I was going to run
15V off an 18V source and had to switch to 12 volts. Current draw was to great for the 15V
Reulator to work well. LDO regulators may work, but most of the common ones are 3V.


> that's what I'd do.
> Even easier, a couple of 3v zeners, one  in each
> power line.

I agree !! This is an easier fix.

> With old gear I'd be worried about tantalum filter caps
> being on the edge of destruction as well.....

And 12V or 25V between both rails +/- electrolytics.

Tim Daugard
AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL
http://home.sprintmail.com/~daugard/synth.htm
http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)



From music.maker at gte.net  Mon Apr  9 15:29:19 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Mon, 09 Apr 2007 06:29:19 -0700
Subject: [sdiy] O.T. Pinging Jay Vaughan
Message-ID: <200704091329.l39DTJ8h005550@linux7.lan>

Humble apologies to the list, I've tried this and an older address for Jay,
but no luck.

Jay - I'm trying to email you at jv at access-music.de, but I get an "invalid
address" bounce...


-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From pfperry at melbpc.org.au  Mon Apr  9 15:29:32 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Mon, 9 Apr 2007 23:29:32 +1000
Subject: [sdiy] tongue stuck to skipole @20v
References: <20070409074025.51DB38BC3E2@mailout2.hotkey.net.au><Pine.LNX.4.58.0704090443210.32598@fourier>
	<005d01c77a9f$94eb8440$5401a8c0@frostwave>
	<003f01c77aa9$b43e6c40$448cfe04@tim3>
Message-ID: <000d01c77aab$1c22fdc0$5401a8c0@frostwave>

Looking at the National datasheet, LM7912 dropout about 1.1V.
So that's the -ve sorted anyway!

paul perry melbourne australia


From ezion67 at gmail.com  Mon Apr  9 17:19:54 2007
From: ezion67 at gmail.com (ezion)
Date: Mon, 9 Apr 2007 17:19:54 +0200
Subject: [sdiy] Digests (was: Reply to sender not list)
In-Reply-To: <43ADADDB-D158-4365-9717-9B8B2786AA71@dibidut.dk>
References: <200704071417.l37EHunm003938@linux7.lan>
	<43ADADDB-D158-4365-9717-9B8B2786AA71@dibidut.dk>
Message-ID: <eed016250704090819j2a95ca4bk31ff9b93a90b15ca@mail.gmail.com>

While count < 666E666 do
{
  Please _NO_ digest!
} ;


From ezion67 at gmail.com  Mon Apr  9 17:41:48 2007
From: ezion67 at gmail.com (ezion)
Date: Mon, 9 Apr 2007 17:41:48 +0200
Subject: [sdiy] center tapped pots?
In-Reply-To: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
Message-ID: <eed016250704090841s2391c290jdf01627cbc1f8c6c@mail.gmail.com>

Try ordering directly from Bourns.
Met those guys on the musik-messe:"But sure you can still order large
quantities, like 50 pcs from us too..."
Guess a little competition from China changed their way of thinking.
They where willing to match Alfa's price for a order of only 1K 11mm
square plastic pots too.
Cool for the moment, but makes me wonder when the Euro comes crashing down.

Theo


On 4/8/07, peter edwards <synth at casperelectronics.com> wrote:
> Howdy y'all...
> I'm looking for a couple 100K, dual, center tapped pots and can't
> seem to find them anywhere. I found some manufacturers but no small
> quantity distributors. Anybody have any leads?
>
> Maybe there's an alternate method for achieving my goal and I don't
> need a center tapped pot, but I can't think of one...
>
> If anyone is interested in giving me some pointers, please read on.
> I'm building a vocal FX unit using the PT2399 echo IC and the HT8950
> vocal processor IC (pitch changer).
> The basic layout is as follows:
> One vocal signal splits through two op-amps. The inverted signals are
> sent one to the echo and the second to the pitch changer. Then the
> output from the two circuits are mixed together, inverted again and
> sent to the output.  So you have 1 input signal that goes through two
> FX circuits in parallel. What I want to do is include a control so
> one of the two wet signals can be routed into the other, pre-mixer.
> This is what I would use the dual, center tapped pot for. I would
> wire the center tapped lug to the left lug and ground both so that
> way the volume control window would be silence from 7-12
> o'clock....Silence to full volume from 12-5 o'clock (does that make
> sense??) The second pot would be reversed. So that way when the
> control is all the way counter clockwise it would send the echo into
> the pitch changer. As you turn the knob clockwise it would fade to
> silence. At the center position, there would be no signal. Then as
> you turn it clockwise past the center position the signal from pitch
> changer into the echo would increase.
>
> any thoughts for alternate methods or obvious flaws in my design?????
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From harrybissell at copper.net  Mon Apr  9 17:45:26 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Mon, 9 Apr 2007 15:45:26 -0000
Subject: [sdiy] tongue stuck to skipole @20v
Message-ID: <380-22007419154526704@copper.net>

The Gentle Electric P/V CAN
run on +/-15V with no problems.
Just be sure of the polarity !!!

I had to repair a Gentle Electric that
I bought to study... including repair of the
potted modules. I used 15V with no ill effects.

H^) harry
>
>
>---- Original Message ----
>From: abisset at dspaudio.com
>To: sasami at hotkey.net.au
>Subject: Re: [sdiy] tongue stuck to skipole @20v
>Date: Mon, 9 Apr 2007 04:50:04 -0700 (PDT)
>
>>Bert or Marc of synton suggested I run my fenix at 20v.. yeazzz
>that's
>>right, 20v.  I was surprised.  I know 18v is max for a lot of ic's
>so I
>>only barely pushed it over at 18.7v. Was fine.  Felt like I was
>taking a
>>risk.  Anyway, guess you can run a fenix on 20v.
>>
>>I do have a Gentle Electric P/V in the serge and I'm probably most
>worried
>>about that having trouble with 15v.  Anyway the reason I'm
>considering
>>this is that A, it might increase the signal levels slightly across
>the
>>system and B, I wouldn't have to mess with a second power supply for
>the
>>Driscoll that resides in this portable setup.
>>
>>-a
>>
>>On Mon, 9 Apr 2007, Ken Stone wrote:
>>
>>> Quite frankly, I cannot see any reason why it would not work,
>though for
>>> modules like the WAD, or that PEF with potted parts, I'd do as
>Cynthia
>>> suggests and check that those hard to get chips are capable of
>running at
>>> the higher voltage, or in the case of the latter, stay with
>+/-12V.
>>>
>>> CD40XX, CD45XX, MC140XX etc. CMOS chips will be fine. Op amps will
>be fine.
>>> The most "delicate" of the op-amps is the MC3401 which is only
>rated for
>>> +18V, but as it is only ever run across the positive supply, it
>wouldn't be
>>> a problem. I'm not sure they were even used in the later versions.
>>>
>>> Still, you do so AT YOUR OWN RISK.
>>>
>>> Ken
>>>
>>> >I've had success doing this on a limited basis, "up-voting"
>selected
>>> >vintage Serge PCBs,
>>> >but I've never done this with a whole panel before.
>>> >
>>> >I suggest that you examine each and every integrated circuit on
>the
>>> >specific Serge panel boards
>>> >and do diligent research by actually looking-up the spec sheet of
>the
>>> >chips that you have installed
>>> >to makes sure that they can handle the extra voltage.  (Each chip
>>> >species often has several variations
>>> >coded after the part number with alphabet letters and I would
>look at
>>> >these carefully to be sure.
>>> >
>>> >Instead of simply reading "TL072", you would examine the entire
>>> >"TL072BCD"  for example.
>>> >(You will probably have better luck with this with newer panels
>than
>>> >with old, do you think?)
>>> >
>>> >Also, many "15 Volt" supplies have a pair of trim pots for
>precise
>>> >adjustment and it may be
>>> >quite possible for you to attached a simple voltmeter to the
>outputs and
>>> >then trim them down
>>> >from +/-15 volts to +/-12, (thus rendering the afore mentioned
>question
>>> >rather moot).
>>> >
>>> >BTW, the Mark Godfry update/replacement for the defunct but oh so
>lovely
>>> >Gentle Electric
>>> >Pitch to Voltage Converter module looks pretty niffy in it's own
>right,
>>> >thanks Aaron!
>>> >
>>> >peace
>>> >
>>> >
>>> >Cyn
>>> >
>>> >
>>> >http://www.cyndustries.com/
>>> >
>>> >
>>> >
>>> >Anthony Bisset wrote:
>>> >> Before this happens to me, I figured I'd ask:
>>> >>
>>> >> Is there any reason I couldn't run serge at +/-15v?
>>> >>
>>> >> I'm not concerned with 1v/octave tracking.  (i prefer to tune
>each CV as
>>> >> i'm playing, it affords more interesting scales so i actually
>pulled all
>>> >> the fixed 1v/octave inputs off the front panel and tied them
>together at a
>>> >> single input for a sort of pol-pot attack, ie, when i get bored
>>> >> i can modulate all modules).
>>> >>
>>> >> There was some discussion of this recently indicating i might
>need to
>>> >> amplify this MEGAMULT signal, but because i'm living on the
>un-impeded
>>> >> lifestyle, does it really matter?
>>> >>
>>> >> unorthodox cheers, feet kicking mud at sky.
>>> >> -anthony
>>> >>
>>> >>
>>> >>
>>> >>  On Sun, 8 Apr 2007, Aaron Lanterman wrote:
>>> >>
>>> >>
>>> >>> On Sat, 7 Apr 2007, bill bigrig wrote:
>>> >>>
>>> >>>
>>> >>>> If you are going for a pitch to control voltage
>>> >>>> module, go to mark.godfrey at gatech.edu. Ask for
>>> >>>> "ECE4803 final project". I am holding in my hand his
>>> >>>> design that uses a LM2917N and a quad TL084, and a
>>> >>>> CA3046 along with some odds and ends to make one. It
>>> >>>>
>>> >>> You can find that here
>>> >>>
>>> >>> http://users.ece.gatech.edu/~lanterma/studentprojects/
>>> >>>
>>> >>> One of these days I'll get around to posting the projects from
>the Fall
>>> >>> 2006 offering...
>>> >>>
>>> >>> - Aaron
>>> >>> _______________________________________________
>>> >>> Synth-diy mailing list
>>> >>> Synth-diy at dropmix.xs4all.nl
>>> >>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>> >>>
>>> >>>
>>> >> _______________________________________________
>>> >> Synth-diy mailing list
>>> >> Synth-diy at dropmix.xs4all.nl
>>> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>> >>
>>> >>
>>> >
>>> >_______________________________________________
>>> >Synth-diy mailing list
>>> >Synth-diy at dropmix.xs4all.nl
>>> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>> >
>>>
>_____________________________________________________________________
>__
>>> Ken Stone   sasami at hotkey.net.au
>>> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>>> Australian Miniature Horses & Ponies
><http://www.blaze.net.au/~sasami/>
>>>
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From casiorapman at hotmail.com  Mon Apr  9 17:47:14 2007
From: casiorapman at hotmail.com (Casio Rapman)
Date: Mon, 09 Apr 2007 08:47:14 -0700
Subject: [sdiy] Akai AX-60 Schematics?  ~``~
Message-ID: <BAY138-F3FBD7B49F847EB5AC7F2EB9590@phx.gbl>

Hi.  Does anyone know where these can be found online, if anywhere?  Thanks!

_________________________________________________________________
Need a break? Find your escape route with Live Search Maps. 
http://maps.live.com/?icid=hmtag3



From jays at aracnet.com  Mon Apr  9 17:54:00 2007
From: jays at aracnet.com (Jay Schwichtenberg)
Date: Mon, 9 Apr 2007 08:54:00 -0700
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <000c01c77a08$d351d0f0$6701a8c0@cheetah>
Message-ID: <GDEMKJDLKPDJFJGFBDFGKEBHCOAA.jays@aracnet.com>

John,

Still get in and see a specialist. And doing some research on your own
doesn't hurt to make sure the doctors haven't missed something.

Coming from the days of before it was required (or even thought of) wearing
ear protection I have some tinnitus. Did a lot of work on farms and in
canneries. Sort of funny though, I pretty much have always had something at
concerts whether I need it or not. Just never thought about work.

Best wishes.
Jay S.


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of John L Marshall
Sent: Sunday, April 08, 2007 11:08 AM
To: synth-diy at dropmix.xs4all.nl; analogue at hyperreal.org
Subject: [sdiy] Hearing, Listen!


A strange thing happened last night. The most important part of my analog
system failed. I lost all hearing in my left ear. I can now only hear low
level pink noise in my left ear and that is all. The emergency room doctor
found no physical damage. He referred me to a specialist.

When I was young, I went to my share of loud concerts; i.e., Jimi Hendrix in
N?rnberg. That may be a contributor to the failing ear.

Advice: Take care of your ears, both of them, they are the most important
part of your analog sound system.

Take care,
John
www.sound-photo.com
www.antenna-farm.com

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Synth-diy at dropmix.xs4all.nl
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From hudson at speakeasy.net  Mon Apr  9 18:09:19 2007
From: hudson at speakeasy.net (Thomas Hudson)
Date: Mon, 9 Apr 2007 09:09:19 -0700
Subject: [sdiy] OT FS MOTM items
Message-ID: <0D6BA572-6F4D-4331-956D-5E4A1CF7876B@speakeasy.net>

I have a few items on eBay:

http://search.ebay.com/_W0QQsassZthomas_hudson5k55QQhtZ-1

Tomy



From houshu at muj.biglobe.ne.jp  Mon Apr  9 18:35:24 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Tue, 10 Apr 2007 01:35:24 +0900 (JST)
Subject: SV: Re: [sdiy] SSM2164 and *one unit* tempco idea!
Message-ID: <20070410.013524.860821271141276.houshu@muj.biglobe.ne.jp>

Hi Karl,

In the last weekend, I looked for the schematics I draw,
but unfortunately, I couldn't find them.  I'm so sorry.

In the schematic, I just inserted a 2164 as an summing amplifier 
in the CV path to the CV of another 2164 that is used as an 
exponential converter.  In another schematic, I inserted a 2164 in
the feedback loop of the CV summing opamp.
In both cases, the difficulties were the CV signal level, 
and trimming procedure.  We have to set the tempco coefficient, 
not only V/Oct factor.

As you imagine, what I was afraid is that the tempco 
coefficient has exponential function of the temperature.
I think we have to compromise about the coefficient 
as close as possible over some wide range of room temperature.

Best,

Sam HOSHUYAMA
Saitama, JAPAN

Date: 2007/04/04 23:07:32
karl dalen <dalenkarl at yahoo.se> wrote:
> Sam!
> 
> I remember Roman was talking about temp compensation
> when he did his SSM2164 VCO but didnt go futher since
> he was pleased with the performance anyway.
> 
> I have been dealing with this idea for years but never
> gotten my thumbs out to actually do something, but now
> i think i at least have a try at it!
> 
> Do you have a schematic then i could compare my idea
> with your to se what differs then report back to you
> if i find anything that differs?
> 
> I think in your non tempco compensation idea you got 
> a multiplikation factor thats not constant and you 
> recognized it as non linearity as you did,it would
> come from both internal expo trannies you are using
> in your VCO.
> 
> Reg
> KD
> 
> 
> 
> --- HOSHUYAMA <houshu at muj.biglobe.ne.jp> skrev:
> 
> > Hello KD,
> > 
> > I considered similar idea a couple of years ago, but abandoned. 
> > (I'was and am thinking of 2164-based synth like Roman Sowa ;-)  
> > Your approach looks different from mine.  I'd like to know the 
> > details of your idea.
> > 
> > I tried to design a VCO (without tempco) using one unit in 2164 for 
> > exponential converter and another for tempco.  The disign was very 
> > difficult for me because its temperature dependency is not linear.  
> > After compromise, I managed to draw a schematic.  However, I couldn't 
> > think it is a better design than ordinary tempco-based method, 
> > because it is complicated and requires adjustment.
> > 
> > Sam HOSHUYAMA
> > Saitama, JAPAN
> > 
> > 
> > Date: 2007/04/04 06:10:39
> > karl dalen <dalenkarl at yahoo.se> wrote:
> > > Idea!
> > > 
> > > In order to compensate for the temp drift in the SSM2164 one usually takes
> > > a tempco, or ntc for each expo,but since here all the expos are on the same
> > > die and therefore (not matched) but at least on the same die close they
> > > would be quite equal in terms of temp drift one could take one tempco/ntc
> > > thermally place it in contact with the top SSM2164 or below (missionary sex
> > > formation) then take the sensed value, scale it to match each expo input
> > and
> > > then simply add this drift coefficient to each expo input.
> > > 
> > > The idea are instead of having four tempcos (which would be expensive)
> > > you can use one dirt cheap NTC for instance, if the NTC bails the entire 
> > > chip will bail instead of having to figure out which OTA of four or more
> > bails
> > > out in the case of using four NTC's.Also you save components, and PCB
> > > real estate and its cheaper!
> > > 
> > > Ideas about this idea!
> > > 
> > > Reg
> > > KD
> > > 
> > > 
> > > 	
> > > 	
> > > 		
> > > _________________________________________________________
> > > Flyger tiden iv?? F?ga dagen med Yahoo! Mails inbyggda
> > > kalender. Dessutom 250 MB gratis, virusscanning och antispam. F?den p?
> > http://se.mail.yahoo.com
> > > _______________________________________________
> > > Synth-diy mailing list
> > > Synth-diy at dropmix.xs4all.nl
> > > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > > 
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > 
> 
> 
> 
> 	
> 	
> 		
> _________________________________________________________
> Flyger tiden iv?? F?ga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F?den p? http://se.mail.yahoo.com
> _______________________________________________
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> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From sounddoctorin at imt.net  Mon Apr  9 19:30:03 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 09 Apr 2007 10:30:03 -0700
Subject: [sdiy] JRC 2090D anyone have specs? casio used these..
In-Reply-To: <fa1b0bd80704090442x62122259x89b41e69191c438e@mail.gmail.com>
References: <461A1304.2050205@imt.net>
	<fa1b0bd80704090442x62122259x89b41e69191c438e@mail.gmail.com>
Message-ID: <461A781B.2070009@imt.net>

Thanks Samppa!  Yeah I figured turning up no google info.  There is just 
enough resonance from factory to start to get some decent clav voicings 
sort of.  -Bob

Samppa Tolvanen wrote:

> Hi.
>
> JRC 2090D is more likely a custom filter chip design for Casio.
>
> I was involved in a modification, where cutoff and resonance of the
> chip were brought under external CV control.
>
> It turned HT-3000 into a different kind of animal with very brutal
> filter sweeps and resonant zaps - highly recommended.
>
> I can ask, if my friend still has the service manual pdf.
>
> Samppa
>
> p.s. I think one of the earlier Casiotones was even more of "a proper
> analog" synth.. with that Knobby feelin'
>
>


From dalenkarl at yahoo.se  Mon Apr  9 23:45:28 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 9 Apr 2007 23:45:28 +0200 (CEST)
Subject: SV: Re: [sdiy] Hearing, Listen!
In-Reply-To: <Pine.LNX.4.58.0704081824200.2797@fourier>
Message-ID: <831015.24325.qm@web27606.mail.ukl.yahoo.com>

Tinitus and or partial tinitus can be caused by squeezed nerves in the neck.
A swedish hospital has done studies that shows that certain nerve positions
causes certain types of tinitus sounds such as high pithed constant tones,
noise of various forms and very low rubling irregular rumbling noises.
 
A friend of mine who suffers from partial tinitus do neck massages
streching and heat treatments when it starts to be unbareable and
it works.

Here is one article about it:
http://www.aftonbladet.se/vss/halsa/story/0,2789,57162,00.html

Tinnitus or M?nieres disease are a pain you can cry for less.:-(
KD


	
	
		
_________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From gjames at kddlab.com  Tue Apr 10 04:57:38 2007
From: gjames at kddlab.com (Greg James)
Date: Mon, 9 Apr 2007 22:57:38 -0400
Subject: [sdiy] Hearing, Listen!
In-Reply-To: <831015.24325.qm@web27606.mail.ukl.yahoo.com>
Message-ID: <CAEGKNANKJLNIBHOBLFMOEKMOPAA.gjames@kddlab.com>

Tinitus can also be a symptom of high blood pressure. I have both and
when I'm watching my food intake to lower my BP, the tinitus gets
better.

I also had whiplash ~12 years ago - I'm going to look into the neck/
nerve connection because I most certainly have a lot of constant neck
and upper back pain, too. Thanks for the info.

-Greg

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of karl dalen
Sent: Monday, April 09, 2007 5:45 PM
To: synth-diy at dropmix.xs4all.nl
Subject: SV: Re: [sdiy] Hearing, Listen!


Tinitus and or partial tinitus can be caused by squeezed nerves in the neck.
A swedish hospital has done studies that shows that certain nerve positions
causes certain types of tinitus sounds such as high pithed constant tones,
noise of various forms and very low rubling irregular rumbling noises.

A friend of mine who suffers from partial tinitus do neck massages
streching and heat treatments when it starts to be unbareable and
it works.

Here is one article about it:
http://www.aftonbladet.se/vss/halsa/story/0,2789,57162,00.html

Tinnitus or M?nieres disease are a pain you can cry for less.:-(
KD





_________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
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From synth at wayfar.net  Tue Apr 10 09:08:06 2007
From: synth at wayfar.net (Chris K)
Date: Tue, 10 Apr 2007 00:08:06 -0700
Subject: [sdiy] CV buffer
In-Reply-To: <20070408055416.GR47569@moo.sysabend.org>
References: <20070408055416.GR47569@moo.sysabend.org>
Message-ID: <461B37D6.5090000@wayfar.net>

What about a FET input, high slew rate op-amp with the rails large 
enough so that you have a few volts headroom +/- your source signal, in 
a non inverting buffer, super simple. Shouldn't be a horror story with 
some of the very high impedance amps out there.


Tom Arnold wrote:

>I need to build a buffer so I can spread a single CV out to multiple
>destinations without cross pollination on the output side.  I'd just do a
>quick opamp buffer but I remember reading horror stories on this list of
>tiny errors being added.
>
>Any suggestions on a stable way to do this without adding noticable error?
>
>  
>



From pfperry at melbpc.org.au  Tue Apr 10 09:11:49 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Tue, 10 Apr 2007 17:11:49 +1000
Subject: [sdiy] center tapped pots?
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<461B38F9.5030301@wayfar.net>
Message-ID: <002101c77b3f$82e2b480$5401a8c0@frostwave>

Call me a pteropus giganteus, but I can't see any centre taps on those
suckers.

paul perry Melbourne Australia

----- Original Message ----- 

> Dual 100K B
>
http://www.allelectronics.com/cgi-bin/item/DLP-100K/470/100K_LINEAR_DUAL_POT_.html
>



From synth at wayfar.net  Tue Apr 10 09:12:57 2007
From: synth at wayfar.net (Chris K)
Date: Tue, 10 Apr 2007 00:12:57 -0700
Subject: [sdiy] center tapped pots?
In-Reply-To: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
Message-ID: <461B38F9.5030301@wayfar.net>

Dual 100K B

http://www.allelectronics.com/cgi-bin/item/DLP-100K/470/100K_LINEAR_DUAL_POT_.html

peter edwards wrote:

> Howdy y'all...
> I'm looking for a couple 100K, dual, center tapped pots and can't  
> seem to find them anywhere. I found some manufacturers but no small  
> quantity distributors. Anybody have any leads?
>
> Maybe there's an alternate method for achieving my goal and I don't  
> need a center tapped pot, but I can't think of one...
>
> If anyone is interested in giving me some pointers, please read on.
> I'm building a vocal FX unit using the PT2399 echo IC and the HT8950  
> vocal processor IC (pitch changer).
> The basic layout is as follows:
> One vocal signal splits through two op-amps. The inverted signals are  
> sent one to the echo and the second to the pitch changer. Then the  
> output from the two circuits are mixed together, inverted again and  
> sent to the output.  So you have 1 input signal that goes through two  
> FX circuits in parallel. What I want to do is include a control so  
> one of the two wet signals can be routed into the other, pre-mixer.   
> This is what I would use the dual, center tapped pot for. I would  
> wire the center tapped lug to the left lug and ground both so that  
> way the volume control window would be silence from 7-12  
> o'clock....Silence to full volume from 12-5 o'clock (does that make  
> sense??) The second pot would be reversed. So that way when the  
> control is all the way counter clockwise it would send the echo into  
> the pitch changer. As you turn the knob clockwise it would fade to  
> silence. At the center position, there would be no signal. Then as  
> you turn it clockwise past the center position the signal from pitch  
> changer into the echo would increase.
>
> any thoughts for alternate methods or obvious flaws in my design?????
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From synth at wayfar.net  Tue Apr 10 12:12:09 2007
From: synth at wayfar.net (Chris K)
Date: Tue, 10 Apr 2007 03:12:09 -0700
Subject: [sdiy] center tapped pots?
In-Reply-To: <002101c77b3f$82e2b480$5401a8c0@frostwave>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>	<461B38F9.5030301@wayfar.net>
	<002101c77b3f$82e2b480$5401a8c0@frostwave>
Message-ID: <461B62F9.1020407@wayfar.net>

Doh!, my bad.

Paul Perry wrote:

>Call me a pteropus giganteus, but I can't see any centre taps on those
>suckers.
>
>paul perry Melbourne Australia
>
>----- Original Message ----- 
>
>  
>
>>Dual 100K B
>>
>>    
>>
>http://www.allelectronics.com/cgi-bin/item/DLP-100K/470/100K_LINEAR_DUAL_POT_.html
>  
>
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>  
>



From stffn at dibidut.dk  Tue Apr 10 15:48:11 2007
From: stffn at dibidut.dk (Steffen)
Date: Tue, 10 Apr 2007 15:48:11 +0200
Subject: [sdiy] center tapped pots?
In-Reply-To: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
Message-ID: <EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk>


On 08/04/2007, at 3.32, peter edwards wrote:

>  center tapped pots

Sorry about my noobness and potential disturbens of this thread.

But what is the trick with center tapped pots - how do they work?  
I've have searched my electronic book, and tried to search the web  
where i found an article <http://www.answers.com/topic/center-tap>  
which doesn't, unfortunately, cut it straight to me.

Thanks.


From pfperry at melbpc.org.au  Tue Apr 10 16:10:02 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Wed, 11 Apr 2007 00:10:02 +1000
Subject: [sdiy] center tapped pots?
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk>
Message-ID: <004201c77b79$ee9eeb00$5401a8c0@frostwave>

As well as tags that connect to the two ends of the resistance track, there
is an extra
one that connects to the middle of the resistance track.

Sometimes, this is useful!

paul perry Melbourne Australia

----- Original Message ----- 
From: "Steffen"
> But what is the trick with center tapped pots - how do they work?
> I've have searched my electronic book, and tried to search the web
> where i found an article <http://www.answers.com/topic/center-tap>
> which doesn't, unfortunately, cut it straight to me.



From resonant at hoohahrecords.com  Tue Apr 10 16:13:56 2007
From: resonant at hoohahrecords.com (Dave Magnuson)
Date: Tue, 10 Apr 2007 10:13:56 -0400
Subject: [sdiy] center tapped pots?
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk>
Message-ID: <001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>

Hi Steffen,

Center tapped pots have a fourth terminal connected to the center of the 
pot's resistive track.

I like to use them on voltage sources for pitch, etc.    You connect V+ and 
V- to the ends of the pot and ground to the center tap.  This assures you 
that you have 0V output at the center of the rotation  This is particularly 
nice if you have a center-detent; it makes sure that you don't have 0.2V or 
some odd error at the center position

Dave

----- Original Message ----- 
From: "Steffen" <stffn at dibidut.dk>
To: "peter edwards" <synth at casperelectronics.com>
Cc: "synth-diy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 10, 2007 9:48 AM
Subject: Re: [sdiy] center tapped pots?


>
> On 08/04/2007, at 3.32, peter edwards wrote:
>
>>  center tapped pots
>
> Sorry about my noobness and potential disturbens of this thread.
>
> But what is the trick with center tapped pots - how do they work?  I've 
> have searched my electronic book, and tried to search the web  where i 
> found an article <http://www.answers.com/topic/center-tap>  which doesn't, 
> unfortunately, cut it straight to me.
>
> Thanks.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From tonyallgood at btinternet.com  Tue Apr 10 16:24:01 2007
From: tonyallgood at btinternet.com (Oakley Sound)
Date: Tue, 10 Apr 2007 15:24:01 +0100
Subject: [sdiy] center tapped pots?
In-Reply-To: <001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>	<EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk>
	<001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>
Message-ID: <461B9E01.5070808@btinternet.com>

I like them best when the centre tap goes to ground, the wiper goes to 
some control input, but each end goes to a different CV source. Like 
perhaps an EG on one end of the track, and an LFO on the other.

This way you get selection of the modulation source as well as a level pot.

Tony

www.oakleysound.com


From profpep at hotmail.com  Tue Apr 10 20:20:36 2007
From: profpep at hotmail.com (Mike)
Date: Tue, 10 Apr 2007 19:20:36 +0100
Subject: [sdiy] center tapped pots?
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>	<EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk><001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>
	<461B9E01.5070808@btinternet.com>
Message-ID: <BAY133-DAV123939560BA1ACBA62F2FEA1580@phx.gbl>

There is an old trick I learned back in the day, to get a 'dead band' in the
middle of a pot: connect a pair of diodes, back to back, in parallel, in the
line from the wiper. This gives a +/- 0.7V mid point null area. It can be
useful, for for pitch benders, since the voltage from the pot is being added
to the pitch voltage anyway.

Some pots made for servo use have a 3rd track terminal too.

Mike



From dalenkarl at yahoo.se  Tue Apr 10 21:15:07 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 10 Apr 2007 21:15:07 +0200 (CEST)
Subject: SV: RE: Re: [sdiy] Hearing, Listen!
In-Reply-To: <CAEGKNANKJLNIBHOBLFMOEKMOPAA.gjames@kddlab.com>
Message-ID: <20070410191507.88388.qmail@web27614.mail.ukl.yahoo.com>

This might help you:

http://www.unmc.edu/whiplash/

Its a new method of operating and in most cases removes the pains 
caused by whiplash. 

Reg
KD 

--- Greg James <gjames at kddlab.com> skrev:

> Tinitus can also be a symptom of high blood pressure. I have both and
> when I'm watching my food intake to lower my BP, the tinitus gets
> better.
> 
> I also had whiplash ~12 years ago - I'm going to look into the neck/
> nerve connection because I most certainly have a lot of constant neck
> and upper back pain, too. Thanks for the info.
> 
> -Greg
> 
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of karl dalen
> Sent: Monday, April 09, 2007 5:45 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: SV: Re: [sdiy] Hearing, Listen!
> 
> 
> Tinitus and or partial tinitus can be caused by squeezed nerves in the neck.
> A swedish hospital has done studies that shows that certain nerve positions
> causes certain types of tinitus sounds such as high pithed constant tones,
> noise of various forms and very low rubling irregular rumbling noises.
> 
> A friend of mine who suffers from partial tinitus do neck massages
> streching and heat treatments when it starts to be unbareable and
> it works.
> 
> Here is one article about it:
> http://www.aftonbladet.se/vss/halsa/story/0,2789,57162,00.html
> 
> Tinnitus or M?nieres disease are a pain you can cry for less.:-(
> KD
> 
> 
> 
> 
> 
> _________________________________________________________
> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?:
> http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      
_________________________________________________________
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From dalenkarl at yahoo.se  Tue Apr 10 21:44:32 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 10 Apr 2007 21:44:32 +0200 (CEST)
Subject: SV: Re: [sdiy] Hearing, Listen!
In-Reply-To: <f8629a6679cdeaf6399d05ecf2c5b119@earthlink.net>
Message-ID: <360648.18967.qm@web27612.mail.ukl.yahoo.com>

You are suffering from partial Tinitus, start to stretch your neck muscles!

KD
--- Eric Brombaugh <ebrombaugh at earthlink.net> skrev:

> 
> On Apr 8, 2007, at 11:07 AM, John L Marshall wrote:
> 
> > A strange thing happened last night. The most important part of my 
> > analog system failed. I lost all hearing in my left ear. I can now 
> > only hear low level pink noise in my left ear and that is all. The 
> > emergency room doctor found no physical damage. He referred me to a 
> > specialist.
> >
> 
> John,
> 
> Something like this has happened to me several times over the last 15 
> years or so. Typically I'll get a feeling of fullness in one ear and a 
> loss of high frequency sensitivity, sometimes accompanied by a 
> low-pitched roaring sound. The sensation is very similar to having 
> water in my ear. In every case it has faded away over the course of a 
> few weeks and my hearing has returned to normal.
> 
> I've had fairly strong tinnitus for as long as I can remember - I'm not 
> sure if it's related.
> 
> Hope for the best!
> 
> Eric
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      
_________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com


From aym-htnys at teaser.fr  Tue Apr 10 21:53:04 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Tue, 10 Apr 2007 21:53:04 +0200
Subject: [sdiy] center tapped pots?
In-Reply-To: <BAY133-DAV123939560BA1ACBA62F2FEA1580@phx.gbl>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<461B9E01.5070808@btinternet.com>
	<BAY133-DAV123939560BA1ACBA62F2FEA1580@phx.gbl>
Message-ID: <20070410195304.GB2594@vulcain.knox.com>

On 2007-04-10 19:20 +0100, Mike wrote:

> There is an old trick I learned back in the day, to get a 'dead
> band' in the middle of a pot: connect a pair of diodes, back to
> back, in parallel, in the line from the wiper. This gives a +/-
> 0.7V mid point null area. It can be useful, for for pitch
> benders, since the voltage from the pot is being added to the
> pitch voltage anyway.

Or as shown below, run two resistors of equal value from the
wiper, one going to the CW lug, one going to the CCW lug. The
curve is relatively flat around the mid point and gets steeper at
either extreme. Probably good for a VCO detune pot.

  http://www.elby-designs.com/documents/tailoringpotentionometers.pdf

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From dlmanley at sonic.net  Tue Apr 10 22:37:07 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Tue, 10 Apr 2007 13:37:07 -0700
Subject: [sdiy] center tapped pots?
In-Reply-To: <20070410195304.GB2594@vulcain.knox.com>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>	<461B9E01.5070808@btinternet.com>	<BAY133-DAV123939560BA1ACBA62F2FEA1580@phx.gbl>
	<20070410195304.GB2594@vulcain.knox.com>
Message-ID: <461BF573.4090606@sonic.net>

Andre Majorel wrote:
> On 2007-04-10 19:20 +0100, Mike wrote:
> 
>> There is an old trick I learned back in the day, to get a 'dead
>> band' in the middle of a pot: connect a pair of diodes, back to
>> back, in parallel, in the line from the wiper. This gives a +/-
>> 0.7V mid point null area. It can be useful, for for pitch
>> benders, since the voltage from the pot is being added to the
>> pitch voltage anyway.

For reference, this method is used in the ARP pitch-bend circuits.

> 
> Or as shown below, run two resistors of equal value from the
> wiper, one going to the CW lug, one going to the CCW lug. The
> curve is relatively flat around the mid point and gets steeper at
> either extreme. Probably good for a VCO detune pot.
> 
>   http://www.elby-designs.com/documents/tailoringpotentionometers.pdf
> 

This is a good paper, but the warnings in the last paragraph should 
perhaps be put at the start: the resistance across the pot with the 
extra resistor(s) can be much lower than the original pot depending on 
the curve you're trying to achieve.  As they say in the paper: the 
surrounding circuit may not like this much.

-Dave



From billbigrig at yahoo.com  Wed Apr 11 01:01:58 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Tue, 10 Apr 2007 16:01:58 -0700 (PDT)
Subject: [sdiy] tongue stuck to ski pole
Message-ID: <536457.58486.qm@web32714.mail.mud.yahoo.com>


howdy,

 Yeah, thanx Aaron.
rig


       
____________________________________________________________________________________
Don't get soaked.  Take a quick peak at the forecast
with the Yahoo! Search weather shortcut.
http://tools.search.yahoo.com/shortcuts/#loc_weather


From synth at casperelectronics.com  Wed Apr 11 05:38:03 2007
From: synth at casperelectronics.com (peter edwards)
Date: Tue, 10 Apr 2007 23:38:03 -0400
Subject: [sdiy] center tapped pots?
In-Reply-To: <27A2BD01-0EEB-4AA1-8182-DA29E876410C@electricdruid.net>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<27A2BD01-0EEB-4AA1-8182-DA29E876410C@electricdruid.net>
Message-ID: <7394E43D-1843-4770-AFFF-CC9760DA8262@casperelectronics.com>

Thanks tom... thats a pretty cool circuit... but isn't this more of a  
cross fader? I'm trying to figure out how to take two parallel audio  
signals (split from one input, processed then mixed to one output)  
and feed the output of one into the input of another. Think of it  
like this, you've got a distortion pedal and a flanger pedal. Your  
guitar signal is split into two identical signals which are fed into  
the two effects. The two effected outputs are then mixed together so  
you have a distorted signal and a flanged signal in parallel. What if  
you want to send some of the fanged signal into the distortion or  
visa versa? If the dist. was looped into the flange and the flange  
was looped into the dist. you would just get feedback, so they need  
to be adjusted at the same time to ensure that only one is looped at  
a time. So I figure I need a dual pot. It needs to be center tapped  
so that the complete volume curve for each loop only takes up one  
half of the full rotation. That way the volume curves for the two  
loops never overlap.....


On Apr 8, 2007, at 7:51 PM, Tom Wiltshire wrote:

>
> On 8 Apr 2007, at 02:32, peter edwards wrote:
>
>> Howdy y'all...
>> I'm looking for a couple 100K, dual, center tapped pots and can't  
>> seem to find them anywhere. I found some manufacturers but no  
>> small quantity distributors. Anybody have any leads?
>>
>> Maybe there's an alternate method for achieving my goal and I  
>> don't need a center tapped pot, but I can't think of one...
>
> You could try this arrangement, which allows you to do the same  
> thing with a standard single pot:
> <MIxer.gif>
>
> When the pot VR3 is at 'max', you're feeding in Input 1 and an  
> inverted version of Input 2, which cancels the Input 2 signal going  
> in the other input - thus you only get Input 1. At the other  
> extreme, you obviously just get Input 2. Half way between, you get  
> a half-cancelled Input 2 (so at half-volume) and a half-volume  
> Input 1.
>
> It uses a few op-amps, but it can be handy.
>
> Regards,
> Tom
>
>
>
>



From lanterma at ece.gatech.edu  Wed Apr 11 05:52:16 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Tue, 10 Apr 2007 23:52:16 -0400 (EDT)
Subject: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>


Most of you know that in the Fall and Spring 2006 semesters, I taught a 
special topics class on the Theory and Design of Music Synthesizers. (If 
any of you have ever been curious to see how I lecture, most of my 
lectures from the Spring semester are up on the website in RealVideo 
format. You probably only don't know that if you've recently joined the 
list.)

The final project consists of designing, prototyping, and constructing a 
modular synthesizer circuit. I had two boxes, one containing the projects 
from the Fall and the other from the Spring. I was fortunate to be able to 
show these to Paul S. in person a few weeks ago ad get his feedback.

My eventual plan was to mount them all in a nice case with a nice front 
panel, and put it the Music Dept. so that Tech students could make music 
for years to come with circuits my students designed and built.

I showed off the circuits when I spoke at our graduate seminar. Since my 
parking deck is some distance from our main classroom building, I left the 
boxes under a table in our mail room, planning to come back on another day 
at night when I could park closer and get the boxes without fear of a 
ticket.

On Monday, I went to retrieve the boxes of circuit boards, and they were 
gone. Further investigation revealed that, on Friday, the custodial staff 
mistook them for trash and threw threm out.

I was willing to go dumpster diving to retrieve them, but it turns out it 
had already been compacted and shipped off; contemplate hundreds of 
dollars in parts and around 300 to 400 person-hours of time in 
construction and debugging, crushed and hauled off to a landfill.

The designs are still documented in reports and schematics (I still need 
to post the projects from the Fall), but the wonder of the students' 
unique first-effort constructions is now lost.

I am beyond angry-beyond-comprehension and gone to 
depressed-beyond-comprehension; want-to-punch-someone-and-scream has now 
gone to crawl-in-the-corner-and-cry.

- Aaron

-----------------------------------------------------------------------------

Dr. Aaron Lanterman, Asst. Prof.
and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
College of Electri. and Comp. Eng.   Fax:    404-894-8363
Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
Atlanta, GA 30332                    Office: Centergy 5212



From cfmd at bredband.net  Wed Apr 11 06:12:43 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 11 Apr 2007 06:12:43 +0200 (CEST)
Subject: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
References: <200704050218.l352IpX9009809@linux7.lan>
	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <20070411.061243.1074805679.cfmd@bredband.net>

From: Aaron Lanterman <lanterma at ece.gatech.edu>
Subject: [sdiy] 300-400 student hours of work, tossed out by our custodial staff
Date: Tue, 10 Apr 2007 23:52:16 -0400 (EDT)
Message-ID: <Pine.GSO.4.60.0704102347590.16635 at bigzilla.ece.gatech.edu>

> 
> Most of you know that in the Fall and Spring 2006 semesters, I taught a 
> special topics class on the Theory and Design of Music Synthesizers. (If 
> any of you have ever been curious to see how I lecture, most of my 
> lectures from the Spring semester are up on the website in RealVideo 
> format. You probably only don't know that if you've recently joined the 
> list.)
> 
> The final project consists of designing, prototyping, and constructing a 
> modular synthesizer circuit. I had two boxes, one containing the projects 
> from the Fall and the other from the Spring. I was fortunate to be able to 
> show these to Paul S. in person a few weeks ago ad get his feedback.
> 
> My eventual plan was to mount them all in a nice case with a nice front 
> panel, and put it the Music Dept. so that Tech students could make music 
> for years to come with circuits my students designed and built.
> 
> I showed off the circuits when I spoke at our graduate seminar. Since my 
> parking deck is some distance from our main classroom building, I left the 
> boxes under a table in our mail room, planning to come back on another day 
> at night when I could park closer and get the boxes without fear of a 
> ticket.
> 
> On Monday, I went to retrieve the boxes of circuit boards, and they were 
> gone. Further investigation revealed that, on Friday, the custodial staff 
> mistook them for trash and threw threm out.
> 
> I was willing to go dumpster diving to retrieve them, but it turns out it 
> had already been compacted and shipped off; contemplate hundreds of 
> dollars in parts and around 300 to 400 person-hours of time in 
> construction and debugging, crushed and hauled off to a landfill.
> 
> The designs are still documented in reports and schematics (I still need 
> to post the projects from the Fall), but the wonder of the students' 
> unique first-effort constructions is now lost.
> 
> I am beyond angry-beyond-comprehension and gone to 
> depressed-beyond-comprehension; want-to-punch-someone-and-scream has now 
> gone to crawl-in-the-corner-and-cry.

1) Make sure that everything not standing in your office has a "Belongs to
   Dr. Aaron Lanterman, Department of XYZ" label clearly on it.

2) Hold a wake at the department. You and your students need the booze, but by
   openly show your great grief the story will move around and it will be used
   as a warning example in both directions. Make sure the student paper gets
   the news with you pointing at the empty spot.

3) Make sure that the trashiness design aspect of the built things gets out and
   that some care is actually done in how things look. It is less likely to be
   viewed as trash then. Also tricks them into UI aspects.

I'm suffering with ya!

Cheers,
Magnus


From synth at wayfar.net  Wed Apr 11 07:07:03 2007
From: synth at wayfar.net (Chris K)
Date: Tue, 10 Apr 2007 22:07:03 -0700
Subject: [sdiy] 300-400 student hours of work, tossed out by our custodial
	staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
References: <200704050218.l352IpX9009809@linux7.lan>
	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <461C6CF7.5050500@wayfar.net>

Outch, my condolences, in a perfect world whoever decided to throw that 
stuff out should get fired, but alas school bureaucracy chances are 
someone will turn the tables.

- ck

Aaron Lanterman wrote:

>
> Most of you know that in the Fall and Spring 2006 semesters, I taught 
> a special topics class on the Theory and Design of Music Synthesizers. 
> (If any of you have ever been curious to see how I lecture, most of my 
> lectures from the Spring semester are up on the website in RealVideo 
> format. You probably only don't know that if you've recently joined 
> the list.)
>
> The final project consists of designing, prototyping, and constructing 
> a modular synthesizer circuit. I had two boxes, one containing the 
> projects from the Fall and the other from the Spring. I was fortunate 
> to be able to show these to Paul S. in person a few weeks ago ad get 
> his feedback.
>
> My eventual plan was to mount them all in a nice case with a nice 
> front panel, and put it the Music Dept. so that Tech students could 
> make music for years to come with circuits my students designed and 
> built.
>
> I showed off the circuits when I spoke at our graduate seminar. Since 
> my parking deck is some distance from our main classroom building, I 
> left the boxes under a table in our mail room, planning to come back 
> on another day at night when I could park closer and get the boxes 
> without fear of a ticket.
>
> On Monday, I went to retrieve the boxes of circuit boards, and they 
> were gone. Further investigation revealed that, on Friday, the 
> custodial staff mistook them for trash and threw threm out.
>
> I was willing to go dumpster diving to retrieve them, but it turns out 
> it had already been compacted and shipped off; contemplate hundreds of 
> dollars in parts and around 300 to 400 person-hours of time in 
> construction and debugging, crushed and hauled off to a landfill.
>
> The designs are still documented in reports and schematics (I still 
> need to post the projects from the Fall), but the wonder of the 
> students' unique first-effort constructions is now lost.
>
> I am beyond angry-beyond-comprehension and gone to 
> depressed-beyond-comprehension; want-to-punch-someone-and-scream has 
> now gone to crawl-in-the-corner-and-cry.
>
> - Aaron
>
> ----------------------------------------------------------------------------- 
>
>
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    
> users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From loscha at gmail.com  Wed Apr 11 07:22:15 2007
From: loscha at gmail.com (Loscha)
Date: Wed, 11 Apr 2007 15:22:15 +1000
Subject: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
References: <200704050218.l352IpX9009809@linux7.lan>
	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <17035a3d0704102222s5899aa52o5edbded3f38ae58@mail.gmail.com>

That is severely harsh.
I've had not that much work and money thrown out by people i lived
with -- thinking that my Crumar Crucianelli electric piano was junk
because it didn't switch on! Never mind the 240 germanium transistors
in it. The TOS chips.
Was probably just a fuse, but, I'll never know.

I'm gonna go and have a cold one on your honor.
Because, as strongbad says, a one that is not cold, is scarcely a one at all.

(a cold Dr Pepper that is  -- despite it being $2.50 a can in
Melbourne, and I'm a diabetic -- I was looking for an excuse to have
one anyway!)

-Ed

On 4/11/07, Aaron Lanterman <lanterma at ece.gatech.edu> wrote:
>
> Most of you know that in the Fall and Spring 2006 semesters, I taught a
> special topics class on the Theory and Design of Music Synthesizers. (If
> any of you have ever been curious to see how I lecture, most of my
> lectures from the Spring semester are up on the website in RealVideo
> format. You probably only don't know that if you've recently joined the
> list.)
>
> The final project consists of designing, prototyping, and constructing a
> modular synthesizer circuit. I had two boxes, one containing the projects
> from the Fall and the other from the Spring. I was fortunate to be able to
> show these to Paul S. in person a few weeks ago ad get his feedback.
>
> My eventual plan was to mount them all in a nice case with a nice front
> panel, and put it the Music Dept. so that Tech students could make music
> for years to come with circuits my students designed and built.
>
> I showed off the circuits when I spoke at our graduate seminar. Since my
> parking deck is some distance from our main classroom building, I left the
> boxes under a table in our mail room, planning to come back on another day
> at night when I could park closer and get the boxes without fear of a
> ticket.
>
> On Monday, I went to retrieve the boxes of circuit boards, and they were
> gone. Further investigation revealed that, on Friday, the custodial staff
> mistook them for trash and threw threm out.
>
> I was willing to go dumpster diving to retrieve them, but it turns out it
> had already been compacted and shipped off; contemplate hundreds of
> dollars in parts and around 300 to 400 person-hours of time in
> construction and debugging, crushed and hauled off to a landfill.
>
> The designs are still documented in reports and schematics (I still need
> to post the projects from the Fall), but the wonder of the students'
> unique first-effort constructions is now lost.
>
> I am beyond angry-beyond-comprehension and gone to
> depressed-beyond-comprehension; want-to-punch-someone-and-scream has now
> gone to crawl-in-the-corner-and-cry.
>
> - Aaron
>
> -----------------------------------------------------------------------------
>
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
www.loscha.com


From obl64 at ix.netcom.com  Wed Apr 11 08:24:06 2007
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Tue, 10 Apr 2007 23:24:06 -0700
Subject: [sdiy] 300-400 student hours of work, tossed out by our custodial
	staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
References: <200704050218.l352IpX9009809@linux7.lan>
	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <461C7F06.9020101@ix.netcom.com>

Aaron,
I have been enjoying the progress on these projects you've shared with 
the list over the past several months.
I'm sorry to hear about the loss :-(
- Oren


From aym-htnys at teaser.fr  Wed Apr 11 08:35:56 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Wed, 11 Apr 2007 08:35:56 +0200
Subject: [sdiy] center tapped pots?
In-Reply-To: <461BF573.4090606@sonic.net>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<461B9E01.5070808@btinternet.com>
	<BAY133-DAV123939560BA1ACBA62F2FEA1580@phx.gbl>
	<20070410195304.GB2594@vulcain.knox.com>
	<461BF573.4090606@sonic.net>
Message-ID: <20070411063556.GA10531@aym.net2.nerim.net>

On 2007-04-10 13:37 -0700, Dave Manley wrote:
> Andre Majorel wrote:
>
> >Or as shown below, run two resistors of equal value from the
> >wiper, one going to the CW lug, one going to the CCW lug.
> >
> >  http://www.elby-designs.com/documents/tailoringpotentionometers.pdf
> 
> This is a good paper, but the warnings in the last paragraph should 
> perhaps be put at the start: the resistance across the pot with the 
> extra resistor(s) can be much lower than the original pot depending on 
> the curve you're trying to achieve.  As they say in the paper: the 
> surrounding circuit may not like this much.

Also the value might not be stable with temperature. If you use a
carbon pot and metal film resistors, part of the circuit has a
tempco of 1000 PPM/K and part of it has a tempco of 100 PPM/K. Rr
/ Rp changes with the temperature.

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From sounddoctorin at imt.net  Wed Apr 11 09:01:37 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Wed, 11 Apr 2007 00:01:37 -0700
Subject: [sdiy] 300-400 student hours of work, tossed out by our	custodial
	staff
In-Reply-To: <20070411.061243.1074805679.cfmd@bredband.net>
References: <200704050218.l352IpX9009809@linux7.lan>	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
	<20070411.061243.1074805679.cfmd@bredband.net>
Message-ID: <461C87D1.8060807@imt.net>

That's a bummer Aaron.  Turn it into a great lesson of somekind.  And 
along the lines of Magnus' suggestion..you might want to stage a 'trash 
in' or something.   Man I'm sorry.  I know how that feels.  -Bob

>  
>


From jgrisso at det3.net  Wed Apr 11 09:55:31 2007
From: jgrisso at det3.net (Joe Grisso)
Date: Wed, 11 Apr 2007 00:55:31 -0700
Subject: [sdiy] Announcing daBus
Message-ID: <864ec6740704110055h21fce1ecx9f0d970e8e2fd96e@mail.gmail.com>

Hey gang,

The first blurbs about my new bussing system is up on my daBus page here:

http://proteus.det3.net/projects/dabus.html

I'm finishing up the boards and metal design files, and once they're
done I'll put them up for all DIY-folk to have at. For people who
don't want to go to the hassle I'll be selling finished modules and
boards.

Questions, comments, points of refutation are definitely welcome!

Best Regards,

Joe Grisso
detachment3 Engineering


From ben.r at iinet.net.au  Wed Apr 11 14:49:39 2007
From: ben.r at iinet.net.au (Benjamin Riggs)
Date: Wed, 11 Apr 2007 20:49:39 +0800
Subject: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <000401c77c37$de9b6580$fb01010a@superman>

Shit hey. I'm only a lonely tech at a uni, but knowing how some of the
academic staff keep there offices (we had one security guard report a
break-in, it was then realised all the papers spread on the floor were just
his filing system) that if it's not in the designated rubbish bin, it
shouldn't get chucked out. It sounds like a sorry mistake that shouldn't
have been made.

A great teaching asset lost. Are you running the classes again (I enjoyed
the first set of online lectures)? Some new projects maybe?

Ben.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Aaron Lanterman
Sent: Wednesday, 11 April 2007 11:52 AM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] 300-400 student hours of work,tossed out by our custodial
staff


Most of you know that in the Fall and Spring 2006 semesters, I taught a 
special topics class on the Theory and Design of Music Synthesizers. (If 
any of you have ever been curious to see how I lecture, most of my 
lectures from the Spring semester are up on the website in RealVideo 
format. You probably only don't know that if you've recently joined the 
list.)

The final project consists of designing, prototyping, and constructing a 
modular synthesizer circuit. I had two boxes, one containing the projects 
from the Fall and the other from the Spring. I was fortunate to be able to 
show these to Paul S. in person a few weeks ago ad get his feedback.

My eventual plan was to mount them all in a nice case with a nice front 
panel, and put it the Music Dept. so that Tech students could make music 
for years to come with circuits my students designed and built.

I showed off the circuits when I spoke at our graduate seminar. Since my 
parking deck is some distance from our main classroom building, I left the 
boxes under a table in our mail room, planning to come back on another day 
at night when I could park closer and get the boxes without fear of a 
ticket.

On Monday, I went to retrieve the boxes of circuit boards, and they were 
gone. Further investigation revealed that, on Friday, the custodial staff 
mistook them for trash and threw threm out.

I was willing to go dumpster diving to retrieve them, but it turns out it 
had already been compacted and shipped off; contemplate hundreds of 
dollars in parts and around 300 to 400 person-hours of time in 
construction and debugging, crushed and hauled off to a landfill.

The designs are still documented in reports and schematics (I still need 
to post the projects from the Fall), but the wonder of the students' 
unique first-effort constructions is now lost.

I am beyond angry-beyond-comprehension and gone to 
depressed-beyond-comprehension; want-to-punch-someone-and-scream has now 
gone to crawl-in-the-corner-and-cry.

- Aaron

----------------------------------------------------------------------------
-

Dr. Aaron Lanterman, Asst. Prof.
and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
College of Electri. and Comp. Eng.   Fax:    404-894-8363
Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
Atlanta, GA 30332                    Office: Centergy 5212

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From dalenkarl at yahoo.se  Wed Apr 11 15:30:53 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Wed, 11 Apr 2007 15:30:53 +0200 (CEST)
Subject: SV: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
Message-ID: <946665.950.qm@web27607.mail.ukl.yahoo.com>

You have been exposed to the *fear of the ticket* syndrome!

In whole it constitutes being afraid of something expencive
about (who has an actual high risk) to happen, but it never 
happens instead something you dont even think of to happen
happens and whom are of the more tragic sort.

If i where in you shoes i would trow some questions at the
custodial staff about their interest in music, what sort, 
if electronic, etc ,well you might get supriced about their
interest in analog synthesizers!   :-) 

You did pack them as to *look* like trash didn't you?

KD 

--- Aaron Lanterman <lanterma at ece.gatech.edu> skrev:

> 
> Most of you know that in the Fall and Spring 2006 semesters, I taught a 
> special topics class on the Theory and Design of Music Synthesizers. (If 
> any of you have ever been curious to see how I lecture, most of my 
> lectures from the Spring semester are up on the website in RealVideo 
> format. You probably only don't know that if you've recently joined the 
> list.)
> 
> The final project consists of designing, prototyping, and constructing a 
> modular synthesizer circuit. I had two boxes, one containing the projects 
> from the Fall and the other from the Spring. I was fortunate to be able to 
> show these to Paul S. in person a few weeks ago ad get his feedback.
> 
> My eventual plan was to mount them all in a nice case with a nice front 
> panel, and put it the Music Dept. so that Tech students could make music 
> for years to come with circuits my students designed and built.
> 
> I showed off the circuits when I spoke at our graduate seminar. Since my 
> parking deck is some distance from our main classroom building, I left the 
> boxes under a table in our mail room, planning to come back on another day 
> at night when I could park closer and get the boxes without fear of a 
> ticket.
> 
> On Monday, I went to retrieve the boxes of circuit boards, and they were 
> gone. Further investigation revealed that, on Friday, the custodial staff 
> mistook them for trash and threw threm out.
> 
> I was willing to go dumpster diving to retrieve them, but it turns out it 
> had already been compacted and shipped off; contemplate hundreds of 
> dollars in parts and around 300 to 400 person-hours of time in 
> construction and debugging, crushed and hauled off to a landfill.
> 
> The designs are still documented in reports and schematics (I still need 
> to post the projects from the Fall), but the wonder of the students' 
> unique first-effort constructions is now lost.
> 
> I am beyond angry-beyond-comprehension and gone to 
> depressed-beyond-comprehension; want-to-punch-someone-and-scream has now 
> gone to crawl-in-the-corner-and-cry.
> 
> - Aaron
> 
> -----------------------------------------------------------------------------
> 
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      
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From harrybissell at copper.net  Wed Apr 11 17:59:51 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 11 Apr 2007 15:59:51 -0000
Subject: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
Message-ID: <380-220074311155951324@copper.net>

It is my experience that the fastest way to assure something
will be destroyed is to store it in a cardboard box. The value
of the items has NO relation to the odds of destruction.

In fact, at my work the first question asked when something
goes missing is "was it in a cardboard box" ???

(I had a bunch of test equipment and tools go missing like this... ;^(

H^) harry
>
>
>---- Original Message ----
>From: lanterma at ece.gatech.edu
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] 300-400 student hours of work,tossed out by our
>custodial staff
>Date: Tue, 10 Apr 2007 23:52:16 -0400 (EDT)
>
>>Most of you know that in the Fall and Spring 2006 semesters, I
>taught a 
>>special topics class on the Theory and Design of Music Synthesizers.
>(If 
>>any of you have ever been curious to see how I lecture, most of my 
>>lectures from the Spring semester are up on the website in RealVideo
>
>>format. You probably only don't know that if you've recently joined
>the 
>>list.)
>>
>>The final project consists of designing, prototyping, and
>constructing a 
>>modular synthesizer circuit. I had two boxes, one containing the
>projects 
>>from the Fall and the other from the Spring. I was fortunate to be
>able to 
>>show these to Paul S. in person a few weeks ago ad get his feedback.
>>
>>My eventual plan was to mount them all in a nice case with a nice
>front 
>>panel, and put it the Music Dept. so that Tech students could make
>music 
>>for years to come with circuits my students designed and built.
>>
>>I showed off the circuits when I spoke at our graduate seminar.
>Since my 
>>parking deck is some distance from our main classroom building, I
>left the 
>>boxes under a table in our mail room, planning to come back on
>another day 
>>at night when I could park closer and get the boxes without fear of
>a 
>>ticket.
>>
>>On Monday, I went to retrieve the boxes of circuit boards, and they
>were 
>>gone. Further investigation revealed that, on Friday, the custodial
>staff 
>>mistook them for trash and threw threm out.
>>
>>I was willing to go dumpster diving to retrieve them, but it turns
>out it 
>>had already been compacted and shipped off; contemplate hundreds of 
>>dollars in parts and around 300 to 400 person-hours of time in 
>>construction and debugging, crushed and hauled off to a landfill.
>>
>>The designs are still documented in reports and schematics (I still
>need 
>>to post the projects from the Fall), but the wonder of the students'
>
>>unique first-effort constructions is now lost.
>>
>>I am beyond angry-beyond-comprehension and gone to 
>>depressed-beyond-comprehension; want-to-punch-someone-and-scream has
>now 
>>gone to crawl-in-the-corner-and-cry.
>>
>>- Aaron
>>
>>--------------------------------------------------------------------
>---------
>>
>>Dr. Aaron Lanterman, Asst. Prof.
>>and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
>>College of Electri. and Comp. Eng.   Fax:    404-894-8363
>>Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
>>Mail Code 0250                       Web:   
>users.ece.gatech.edu/~lanterma
>>Atlanta, GA 30332                    Office: Centergy 5212
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From hughes_david_j at btopenworld.com  Wed Apr 11 18:49:59 2007
From: hughes_david_j at btopenworld.com (David J. Hughes)
Date: Wed, 11 Apr 2007 17:49:59 +0100
Subject: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
Message-ID: <C242D046.15C4E%hughes_david_j@btopenworld.com>

I saved a Sony VAIO LX1 desktop from the dumpster last year. The academic
staff at the Uni had decided that it was bust because the thing always ran
too hot and the cooling fan never switched off. I figured that moving it
away from the radiator might help. :o)

Anyway, it's at home, it works well enough to record an album. Or two. :) :)
:)

David

-- 
Infection Music Limited.                     http://www.infectionmusic.co.uk

This e-mail and any files transmitted with it are confidential and intended
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any losses as a result of any viruses being passed on.




From stffn at dibidut.dk  Wed Apr 11 20:08:54 2007
From: stffn at dibidut.dk (Steffen)
Date: Wed, 11 Apr 2007 20:08:54 +0200
Subject: [sdiy] center tapped pots?
In-Reply-To: <001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>
References: <70046C0F-EE45-47AE-A4AD-07985281CB57@casperelectronics.com>
	<EAD70516-BB67-40A0-B5A2-2A7173CA1B8B@dibidut.dk>
	<001401c77b7a$7b5038b0$947ba8c0@HypoLuxa>
Message-ID: <42B4B1AC-E2E1-48A2-95AD-5FD2AB81865B@dibidut.dk>

Thanks for all the kind and informative replies!

Best, Steffen


From lanterma at ece.gatech.edu  Wed Apr 11 20:21:53 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 11 Apr 2007 14:21:53 -0400 (EDT)
Subject: [sdiy] 300-400 student hours of work, tossed out by our	custodial
	staff
In-Reply-To: <461C87D1.8060807@imt.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<Pine.GSO.4.60.0704102347590.16635@bigzilla.ece.gatech.edu>
	<20070411.061243.1074805679.cfmd@bredband.net>
	<461C87D1.8060807@imt.net>
Message-ID: <Pine.GSO.4.60.0704111420290.17525@bigzilla.ece.gatech.edu>


On Wed, 11 Apr 2007, Bob Weigel wrote:

> That's a bummer Aaron.  Turn it into a great lesson of somekind.  And along 
> the lines of Magnus' suggestion..you might want to stage a 'trash in' or 
> something.   Man I'm sorry.  I know how that feels.  -Bob

As everyone noted, I should have put a "Property of Aaron Lanterman" or a 
"Not trash, do not discard" or some sort of sign on it.

The whole department knows about it now, so it's started a discussion.

In the building my office is in, the custodial staff doesn't touch 
anything that doesn't have "basura" written on it if it's not in a trash 
can and I got used to that... this happened in a different building.

  - Aaron


From lanterma at ece.gatech.edu  Wed Apr 11 20:31:53 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 11 Apr 2007 14:31:53 -0400 (EDT)
Subject: [sdiy] May run class again this Spring
In-Reply-To: <000401c77c37$de9b6580$fb01010a@superman>
References: <000401c77c37$de9b6580$fb01010a@superman>
Message-ID: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>


On Wed, 11 Apr 2007, Benjamin Riggs wrote:

> A great teaching asset lost. Are you running the classes again (I enjoyed
> the first set of online lectures)? Some new projects maybe?

It looks like it'll run again this Spring. I'm thinking of rearranging it 
- I tried doing analog and digital, but the digital stuff at the end got 
orphaned - I didn't give them and homework or projects on it, since they 
were all working on their analog project. So... I'm thinking of 
rearranging it as a "lecture/lab" class instead of a "lecture" class, as 
far as scheduling goes, front-load the lecturing, and let them work on 
their projects full-time the last month or so without me lecturing.

Then... I could put together a second course focusing on digital stuff. I 
could set it up so you could take the courses in either order.

I just don't feel like I can do analog and digital in one semester 
and given them both justice.

- Aaron


From lanterma at ece.gatech.edu  Wed Apr 11 20:33:45 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 11 Apr 2007 14:33:45 -0400 (EDT)
Subject: SV: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
In-Reply-To: <946665.950.qm@web27607.mail.ukl.yahoo.com>
References: <946665.950.qm@web27607.mail.ukl.yahoo.com>
Message-ID: <Pine.GSO.4.60.0704111432580.17525@bigzilla.ece.gatech.edu>


On Wed, 11 Apr 2007, karl dalen wrote:

> You did pack them as to *look* like trash didn't you?

Well, it's just a box full of circuit boards with various jacks and knobs 
and switches hanging off them. If you didn't already know what they were 
they'd really be know way to know that they were music related.

- Aaron


From thescum at surfree.com  Wed Apr 11 21:28:55 2007
From: thescum at surfree.com (Byron G. Jacquot)
Date: Wed, 11 Apr 2007 12:28:55 -0700 (GMT-07:00)
Subject: SV: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
Message-ID: <23766219.1176319735622.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>

>Well, it's just a box full of circuit boards with various jacks and knobs 
>and switches hanging off them. If you didn't already know what they were 
>they'd really be know way to know that they were music related.

>From that description, you're probably lucky that Homeland Security wasn't called, so the modules could be safely "detonated."

Not to make too much light here.  I understand the situation is rather disheartening.

Byron Jacquot


From lanterma at ece.gatech.edu  Wed Apr 11 21:54:49 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 11 Apr 2007 15:54:49 -0400 (EDT)
Subject: SV: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
In-Reply-To: <23766219.1176319735622.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>
References: <23766219.1176319735622.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>
Message-ID: <Pine.GSO.4.60.0704111553560.17632@bigzilla.ece.gatech.edu>


On Wed, 11 Apr 2007, Byron G. Jacquot wrote:

>> From that description, you're probably lucky that Homeland Security 
>> wasn't called, so the modules could be safely "detonated."

I'm sure if I tried to take it through airport security I'd have a large 
number of interested parties decending at any moment. Since we are an ECE 
department, people are fortunately used to seeing all manner of strange 
electronic gizmos.

- Aaron


From lanterma at ece.gatech.edu  Wed Apr 11 21:55:46 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 11 Apr 2007 15:55:46 -0400 (EDT)
Subject: SV: [sdiy] 300-400 student hours of work, tossed out by our
	custodial staff
In-Reply-To: <23766219.1176319735622.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>
References: <23766219.1176319735622.JavaMail.root@mswamui-bichon.atl.sa.earthlink.net>
Message-ID: <Pine.GSO.4.60.0704111555020.17632@bigzilla.ece.gatech.edu>


On Wed, 11 Apr 2007, Byron G. Jacquot wrote:

>> From that description, you're probably lucky that Homeland Security 
>> wasn't called, so the modules could be safely "detonated."

On "The Ugly One with the Jewels," Laurie Anderson tells a story about 
doing impromptu concerts in airports to explain what her odd looking 
equipment did to security personnel.

- Aaron


From dalenkarl at yahoo.se  Wed Apr 11 22:08:54 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Wed, 11 Apr 2007 22:08:54 +0200 (CEST)
Subject: SV: Re: SV: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <Pine.GSO.4.60.0704111432580.17525@bigzilla.ece.gatech.edu>
Message-ID: <598034.24082.qm@web27607.mail.ukl.yahoo.com>

Pain!

KD
--- Aaron Lanterman <lanterma at ece.gatech.edu> skrev:

> 
> On Wed, 11 Apr 2007, karl dalen wrote:
> 
> > You did pack them as to *look* like trash didn't you?
> 
> Well, it's just a box full of circuit boards with various jacks and knobs 
> and switches hanging off them. If you didn't already know what they were 
> they'd really be know way to know that they were music related.
> 
> - Aaron
> 



      
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From prowlerraven32 at hotmail.com  Wed Apr 11 23:27:38 2007
From: prowlerraven32 at hotmail.com (Logan Mitchell Sr)
Date: Wed, 11 Apr 2007 17:27:38 -0400
Subject: [sdiy] Analog keyboard control voltage circuitry question
Message-ID: <BAY110-F38571EE573B1E737BEB501C15F0@phx.gbl>

04/11/2007

When you assemble an analog keyboard using the 100 ohm resistive voltage 
divider network, what should the maximum voltage be that enters the divider 
network so that each octave measures 1.0 volt and so on as you go from left 
to right on the keyboard ? Also, should a constant current source be used or 
can you use a voltage regulator to do the same thing ?

Logan

_________________________________________________________________
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From harrybissell at copper.net  Wed Apr 11 23:46:48 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 11 Apr 2007 21:46:48 -0000
Subject: [sdiy] Analog keyboard control voltage circuitry question
Message-ID: <380-220074311214648748@copper.net>

You could use a constant current source if the keys
are set to ground the resistive string... or a voltage
source if the keys pick off a voltage into a suitable
(read WAY) high impedance buffer.

I prefer the current source with grounded keys, so that
pressing two keys does not generate a strange in-between
voltage

There should be 1/12th volt across each resistor (or you
could use gain in the buffer stage to adjust it to suit

H^) harry




>
>
>
>---- Original Message ----
>From: prowlerraven32 at hotmail.com
>To: analogue at hyperreal.org, synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] Analog keyboard control voltage circuitry
>question
>Date: Wed, 11 Apr 2007 17:27:38 -0400
>
>>04/11/2007
>>
>>When you assemble an analog keyboard using the 100 ohm resistive
>voltage 
>>divider network, what should the maximum voltage be that enters the
>divider 
>>network so that each octave measures 1.0 volt and so on as you go
>from left 
>>to right on the keyboard ? Also, should a constant current source be
>used or 
>>can you use a voltage regulator to do the same thing ?
>>
>>Logan
>>
>>_________________________________________________________________
>>Download Messenger. Join the i?m Initiative. Help make a difference
>today. 
>>http://im.live.com/messenger/im/home/?source=TAGHM_APR07
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From billbigrig at yahoo.com  Thu Apr 12 01:34:32 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Wed, 11 Apr 2007 16:34:32 -0700 (PDT)
Subject: [sdiy] 300-400 hours student work
Message-ID: <27965.88821.qm@web32715.mail.mud.yahoo.com>

Howdy,

 somehow I get the feeling that the box did not
actually make it to the trash.
Rig


       
____________________________________________________________________________________
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See all the new 2007 cars at Yahoo! Autos.
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From patchell at cox.net  Thu Apr 12 07:42:25 2007
From: patchell at cox.net (Jim Patchell)
Date: Wed, 11 Apr 2007 22:42:25 -0700
Subject: [sdiy] ARM 9 RTOS
In-Reply-To: <BAY138-F3FBD7B49F847EB5AC7F2EB9590@phx.gbl>
References: <BAY138-F3FBD7B49F847EB5AC7F2EB9590@phx.gbl>
Message-ID: <461DC6C1.3090807@cox.net>

http://www.noniandjim.com/Jim/uproc/arm9.html

Something I have been playing with....

Sure, there are other RTOSs out there....but...this one, for me, was 
DIY.....

-Jim




From synth at wayfar.net  Thu Apr 12 08:24:55 2007
From: synth at wayfar.net (Chris K)
Date: Wed, 11 Apr 2007 23:24:55 -0700
Subject: [sdiy] May run class again this Spring
In-Reply-To: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
References: <000401c77c37$de9b6580$fb01010a@superman>
	<Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
Message-ID: <461DD0B7.2020009@wayfar.net>

Seperating them is a good idea imho, college cources are notorious for 
trying to cover too much at a time resulting in (usually) only an obtuse 
understanding / discussion / focus on any particular topic.

It might be a good idea to cover making audiophile grade power supplys 
in the course, or just a whole day on making power supplys.

Theres some interesting PSU nfo on Tangentsoft for the headphone amp 
projects,
http://tangentsoft.net/elec/opamp-linreg.html

This circuit is kind of interesting too, how the gnd is set up in this 
low noise headphone amp,
http://tangentsoft.net/audio/ppa/amp2/

Might be a way to squeeze even more s/n from VCAs and signal processing 
circuits.

-ck

Aaron Lanterman wrote:

>
> On Wed, 11 Apr 2007, Benjamin Riggs wrote:
>
>> A great teaching asset lost. Are you running the classes again (I 
>> enjoyed
>> the first set of online lectures)? Some new projects maybe?
>
>
> It looks like it'll run again this Spring. I'm thinking of rearranging 
> it - I tried doing analog and digital, but the digital stuff at the 
> end got orphaned - I didn't give them and homework or projects on it, 
> since they were all working on their analog project. So... I'm 
> thinking of rearranging it as a "lecture/lab" class instead of a 
> "lecture" class, as far as scheduling goes, front-load the lecturing, 
> and let them work on their projects full-time the last month or so 
> without me lecturing.
>
> Then... I could put together a second course focusing on digital 
> stuff. I could set it up so you could take the courses in either order.
>
> I just don't feel like I can do analog and digital in one semester and 
> given them both justice.
>
> - Aaron
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From stefano74 at hotmail.com  Thu Apr 12 10:40:21 2007
From: stefano74 at hotmail.com (-- Stefano --)
Date: Thu, 12 Apr 2007 10:40:21 +0200
Subject: [sdiy] Digest options and/or general rules for signing in/out sdiy
In-Reply-To: <BAY110-F38571EE573B1E737BEB501C15F0@phx.gbl>
Message-ID: <BAY104-F399850E8815E06CEAF15DEA85E0@phx.gbl>

Hello,

I was wondering if someone post some short instructions (or a link) for:
- signing in / out sdiy
- suspend the subscription to sdiy
- activate a "digest" for sdiy (i.e.: one e-mail per day containing all the 
messages of the day before)

Bye

--)) Stefano ((--

_________________________________________________________________
Windows Live OneCare: tutto per la cura del tuo PC ! Provalo Gratis! 
http://onecare.live.com/standard/it-it/default.htm



From jbuckf50 at hotmail.com  Thu Apr 12 10:50:49 2007
From: jbuckf50 at hotmail.com (Josh Forgione)
Date: Thu, 12 Apr 2007 08:50:49 +0000
Subject: [sdiy] May run class again this Spring
In-Reply-To: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
Message-ID: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>

My $0.02-

Analog synthesizer building is now a very niche field.  College students 
deserve educational opportunities to gain skills which are relevant in the 
workplace.

That's not to devalue the analog education.  The lessons learned via analog 
design are priceless, especially if you want to be a hardware engineer.  But 
fundamentally a person looking for a career in the audio industry will have 
an easier time finding work with a digital/dsp background.   And I'm 
guessing if your class is pretty good you'll have at least a couple students 
inspired to work in the audio industry.

So though this is a synth diy mailing list, and I happen to find analog 
design more interesting, I'd recommend against any short-changing of the 
digital material.  Two courses if you can swing it.

Josh


>From: Aaron Lanterman <lanterma at ece.gatech.edu>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] May run class again this Spring
>Date: Wed, 11 Apr 2007 14:31:53 -0400 (EDT)
>
>
>On Wed, 11 Apr 2007, Benjamin Riggs wrote:
>
>>A great teaching asset lost. Are you running the classes again (I enjoyed
>>the first set of online lectures)? Some new projects maybe?
>
>It looks like it'll run again this Spring. I'm thinking of rearranging it - 
>I tried doing analog and digital, but the digital stuff at the end got 
>orphaned - I didn't give them and homework or projects on it, since they 
>were all working on their analog project. So... I'm thinking of rearranging 
>it as a "lecture/lab" class instead of a "lecture" class, as far as 
>scheduling goes, front-load the lecturing, and let them work on their 
>projects full-time the last month or so without me lecturing.
>
>Then... I could put together a second course focusing on digital stuff. I 
>could set it up so you could take the courses in either order.
>
>I just don't feel like I can do analog and digital in one semester and 
>given them both justice.
>
>- Aaron
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
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http://maps.live.com/?icid=hmtag3



From cfmd at bredband.net  Thu Apr 12 11:21:18 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Thu, 12 Apr 2007 11:21:18 +0200 (CEST)
Subject: [sdiy] 300-400 hours student work
In-Reply-To: <27965.88821.qm@web32715.mail.mud.yahoo.com>
References: <27965.88821.qm@web32715.mail.mud.yahoo.com>
Message-ID: <20070412.112118.1012646927.cfmd@bredband.net>

From: bill bigrig <billbigrig at yahoo.com>
Subject: [sdiy] 300-400 hours student work
Date: Wed, 11 Apr 2007 16:34:32 -0700 (PDT)
Message-ID: <27965.88821.qm at web32715.mail.mud.yahoo.com>

> Howdy,
> 
>  somehow I get the feeling that the box did not
> actually make it to the trash.

If you where doing the trash in that building, either you would ask if it
really was trash, and if you got affirmative you would put it in the trunk of
your car.

If a more normal cleaning guy does it, it will end up in the dumpster, he would
just see a cardboardbox full of junk and handle it properly.

Such is life, and you need to handle it accordingly.

Cheers,
Magnus


From aym-htnys at teaser.fr  Thu Apr 12 12:14:23 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Thu, 12 Apr 2007 12:14:23 +0200
Subject: [sdiy] May run class again this Spring
In-Reply-To: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
References: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
	<BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
Message-ID: <20070412101423.GA14863@aym.net2.nerim.net>

On 2007-04-12 08:50 +0000, Josh Forgione wrote:

> Analog synthesizer building is now a very niche field.  College
> students deserve educational opportunities to gain skills which
> are relevant in the workplace.

I suspect that anyone who studies EE in the US in 2007 is not in
it for the job opportunites.

My crystal ball tells me that most EE students end up in software
or designing digital devices they don't particularly care about.
Aaron's giving his students a chance, maybe their last, to
associate EE with fun.

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From vitruvius at lethargicrecords.com  Thu Apr 12 14:42:24 2007
From: vitruvius at lethargicrecords.com (Jim Eastman)
Date: Thu, 12 Apr 2007 08:42:24 -0400
Subject: [sdiy] May run class again this Spring
In-Reply-To: <20070412101423.GA14863@aym.net2.nerim.net>
References: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
	<BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
	<20070412101423.GA14863@aym.net2.nerim.net>
Message-ID: <627296200704120542p5eb246cfr7e3ae6df721951d@mail.gmail.com>

I'd have to disagree with you, actually. There's still a good demand
for people who can do analog design, and it's actually growing since
fewer EEs graduate with good analog design skills.

I'm an EE in the medical device industry, and while I do a fair amount
of work with DSPs and embedded systems, I still do a lot of analog
design, as well. Somebody has to gain stage and filter those ECG
signals. Somebody has to design the front end to an ADC. :-)

On 4/12/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
> On 2007-04-12 08:50 +0000, Josh Forgione wrote:
>
> > Analog synthesizer building is now a very niche field.  College
> > students deserve educational opportunities to gain skills which
> > are relevant in the workplace.
>
> I suspect that anyone who studies EE in the US in 2007 is not in
> it for the job opportunites.
>
> My crystal ball tells me that most EE students end up in software
> or designing digital devices they don't particularly care about.
> Aaron's giving his students a chance, maybe their last, to
> associate EE with fun.
>
> --
> Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
> Do not use this account for regular correspondence.
> See the URL above for contact information.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From pfperry at melbpc.org.au  Thu Apr 12 15:04:49 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Thu, 12 Apr 2007 23:04:49 +1000
Subject: [sdiy] May run class again this Spring
References: <Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu><BAY144-F29FCE2813515925B82900CD95E0@phx.gbl><20070412101423.GA14863@aym.net2.nerim.net>
	<627296200704120542p5eb246cfr7e3ae6df721951d@mail.gmail.com>
Message-ID: <000b01c77d03$27c5d940$5401a8c0@frostwave>

+1 on what Jim Eastman said.
here in Australia there is no mass market electronics manufacturing,
but there is quite a bit of small and medium run electronic device
manufacture, for controllers & sensors & data loggers etc, all
kinds of industrial application. And all this stuff has analog input.

Now it is true that many EE schools have largely gone over to 
computing, eg DSP, but I have to say, some beginning EEs who did 
analog fx work wiht me, have found the experience suprisingly
helpful in their later jobs.

A wise man once said that "the best time to teach something is when the 
person learning wants to know it". That's why Aaron's synth diy classes 
are probably doing some good.

paul perry (Frostwave analog fx) Melbourne Australia


From dalenkarl at yahoo.se  Thu Apr 12 15:07:33 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 12 Apr 2007 15:07:33 +0200 (CEST)
Subject: SV: Re: [sdiy] May run class again this Spring
In-Reply-To: <20070412101423.GA14863@aym.net2.nerim.net>
Message-ID: <40004.4397.qm@web27601.mail.ukl.yahoo.com>

Indeed, EE with fun are a seldom seen oportunity these days!

KD
 
--- Andre Majorel <aym-htnys at teaser.fr> skrev:

> On 2007-04-12 08:50 +0000, Josh Forgione wrote:
> 
> > Analog synthesizer building is now a very niche field.  College
> > students deserve educational opportunities to gain skills which
> > are relevant in the workplace.
> 
> I suspect that anyone who studies EE in the US in 2007 is not in
> it for the job opportunites.
> 
> My crystal ball tells me that most EE students end up in software
> or designing digital devices they don't particularly care about.
> Aaron's giving his students a chance, maybe their last, to
> associate EE with fun.
> 
> -- 
> Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
> Do not use this account for regular correspondence.
> See the URL above for contact information.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
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From music.maker at gte.net  Thu Apr 12 15:14:21 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Thu, 12 Apr 2007 06:14:21 -0700
Subject: [sdiy] May run class again this Spring
Message-ID: <200704121314.l3CDELkj012881@linux7.lan>

>On 4/12/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
>> On 2007-04-12 08:50 +0000, Josh Forgione wrote:
>>
>> > Analog synthesizer building is now a very niche field.  College
>> > students deserve educational opportunities to gain skills which
>> > are relevant in the workplace.
>>
>> I suspect that anyone who studies EE in the US in 2007 is not in
>> it for the job opportunites.
>>
>> My crystal ball tells me that most EE students end up in software
>> or designing digital devices they don't particularly care about.
>> Aaron's giving his students a chance, maybe their last, to
>> associate EE with fun.

Nothing against analog designs, but I see not reason to believe that digital design
precludes fun.  I've just finished my first FPGA MIDI synth and I can tell you that
it was a gas to do and I'm motivated to do more (and I'm not being paid a single
dime to do it).  I learned, I ventured out, I tested myself, I worked hard and I
succeeded.  I don't believe that a choice of analog or digital has anything to do
with forcing one to work with "devices they don't particularly care about".  I
think it's a big mistake to believe hype about how much cash you can make doing X
or Y, that nonsense created many crappy software developers during the dot-com
boom.  The same can happen in any field.  When I was in 2nd grade, my teacher show
the class a simple complete circuit with a knife switch, a dry cell and and a light
bulb.  It was the closest thing I'd ever seen to real magic.  I was fascinated and
that's what started me.  This is the kind of discovery each person must do to find
something they really enjoy.  EE is fun for anyone who enjoys discovery, thinking,
imaginitive ideas, and hard work.  It has nothing whatever to do with whether
something works in the analog domain or the digital domain.

-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From jbuckf50 at hotmail.com  Thu Apr 12 15:43:54 2007
From: jbuckf50 at hotmail.com (Josh Forgione)
Date: Thu, 12 Apr 2007 13:43:54 +0000
Subject: [sdiy] May run class again this Spring
In-Reply-To: <627296200704120542p5eb246cfr7e3ae6df721951d@mail.gmail.com>
Message-ID: <BAY144-F1126E5DE2E01E78CB020A0D95E0@phx.gbl>

I was not advising him to remove the analog course.  I'm also an analog 
designer.

Josh


>From: "Jim Eastman" <vitruvius at lethargicrecords.com>
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] May run class again this Spring
>Date: Thu, 12 Apr 2007 08:42:24 -0400
>
>I'd have to disagree with you, actually. There's still a good demand
>for people who can do analog design, and it's actually growing since
>fewer EEs graduate with good analog design skills.
>
>I'm an EE in the medical device industry, and while I do a fair amount
>of work with DSPs and embedded systems, I still do a lot of analog
>design, as well. Somebody has to gain stage and filter those ECG
>signals. Somebody has to design the front end to an ADC. :-)
>
>On 4/12/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
>>On 2007-04-12 08:50 +0000, Josh Forgione wrote:
>>
>> > Analog synthesizer building is now a very niche field.  College
>> > students deserve educational opportunities to gain skills which
>> > are relevant in the workplace.
>>
>>I suspect that anyone who studies EE in the US in 2007 is not in
>>it for the job opportunites.
>>
>>My crystal ball tells me that most EE students end up in software
>>or designing digital devices they don't particularly care about.
>>Aaron's giving his students a chance, maybe their last, to
>>associate EE with fun.
>>
>>--
>>Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
>>Do not use this account for regular correspondence.
>>See the URL above for contact information.
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Exercise your brain! Try Flexicon. 
http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07



From mr.threv at gmail.com  Thu Apr 12 17:16:12 2007
From: mr.threv at gmail.com (Matt Simpson)
Date: Thu, 12 Apr 2007 11:16:12 -0400
Subject: [sdiy] May run class again this Spring
In-Reply-To: <BAY144-F1126E5DE2E01E78CB020A0D95E0@phx.gbl>
References: <627296200704120542p5eb246cfr7e3ae6df721951d@mail.gmail.com>
	<BAY144-F1126E5DE2E01E78CB020A0D95E0@phx.gbl>
Message-ID: <398e46970704120816i3a72d444h93989e401c8ee70f@mail.gmail.com>

having graduated from the school in question
with a computer engineering degree,
let me assure folks that the focus in the school
IS IN FACT primarily on digital design

aaron's class is a diamond in the rough; the only
class that actually shows why a mF is used
when a 1F capacitor would be ridiculous, and other
analog truths.

On 4/12/07, Josh Forgione <jbuckf50 at hotmail.com> wrote:
> I was not advising him to remove the analog course.  I'm also an analog
> designer.
>
> Josh
>
>
> >From: "Jim Eastman" <vitruvius at lethargicrecords.com>
> >To: synth-diy at dropmix.xs4all.nl
> >Subject: Re: [sdiy] May run class again this Spring
> >Date: Thu, 12 Apr 2007 08:42:24 -0400
> >
> >I'd have to disagree with you, actually. There's still a good demand
> >for people who can do analog design, and it's actually growing since
> >fewer EEs graduate with good analog design skills.
> >
> >I'm an EE in the medical device industry, and while I do a fair amount
> >of work with DSPs and embedded systems, I still do a lot of analog
> >design, as well. Somebody has to gain stage and filter those ECG
> >signals. Somebody has to design the front end to an ADC. :-)
> >
> >On 4/12/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
> >>On 2007-04-12 08:50 +0000, Josh Forgione wrote:
> >>
> >> > Analog synthesizer building is now a very niche field.  College
> >> > students deserve educational opportunities to gain skills which
> >> > are relevant in the workplace.
> >>
> >>I suspect that anyone who studies EE in the US in 2007 is not in
> >>it for the job opportunites.
> >>
> >>My crystal ball tells me that most EE students end up in software
> >>or designing digital devices they don't particularly care about.
> >>Aaron's giving his students a chance, maybe their last, to
> >>associate EE with fun.
> >>
> >>--
> >>Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
> >>Do not use this account for regular correspondence.
> >>See the URL above for contact information.
> >>_______________________________________________
> >>Synth-diy mailing list
> >>Synth-diy at dropmix.xs4all.nl
> >>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _________________________________________________________________
> Exercise your brain! Try Flexicon.
> http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
What is music?
Music is a rich, hyper-dimensional language allowing for high
bandwidth communication of highly abstract concepts and images. Music
is the name for the interaction of the vibrations in the physical
world with the metaphysical emotional center of the human soul. Music
is an expression of consciousness, a path, a doorway.
-- Jeremy "Logickal" Dickens



From mr.threv at gmail.com  Thu Apr 12 17:20:27 2007
From: mr.threv at gmail.com (Matt Simpson)
Date: Thu, 12 Apr 2007 11:20:27 -0400
Subject: SV: [sdiy] 300-400 student hours of work,
	tossed out by our custodial staff
In-Reply-To: <598034.24082.qm@web27607.mail.ukl.yahoo.com>
References: <Pine.GSO.4.60.0704111432580.17525@bigzilla.ece.gatech.edu>
	<598034.24082.qm@web27607.mail.ukl.yahoo.com>
Message-ID: <398e46970704120820gde172f5vb083e1324a2bceeb@mail.gmail.com>

this goes a long way to show how dated EE education
is at Ga Tech. [0]

aaron my heart truly goes out to you.

matt

[0] not to disparage the school; it's fuckin great.

On 4/11/07, karl dalen <dalenkarl at yahoo.se> wrote:
> Pain!
>
> KD
> --- Aaron Lanterman <lanterma at ece.gatech.edu> skrev:
>
> >
> > On Wed, 11 Apr 2007, karl dalen wrote:
> >
> > > You did pack them as to *look* like trash didn't you?
> >
> > Well, it's just a box full of circuit boards with various jacks and knobs
> > and switches hanging off them. If you didn't already know what they were
> > they'd really be know way to know that they were music related.
> >
> > - Aaron
> >
>
>
>
>
> _________________________________________________________
> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


-- 
What is music?
Music is a rich, hyper-dimensional language allowing for high
bandwidth communication of highly abstract concepts and images. Music
is the name for the interaction of the vibrations in the physical
world with the metaphysical emotional center of the human soul. Music
is an expression of consciousness, a path, a doorway.
-- Jeremy "Logickal" Dickens



From lanterma at ece.gatech.edu  Thu Apr 12 19:05:33 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Thu, 12 Apr 2007 13:05:33 -0400 (EDT)
Subject: [sdiy] May run class again this Spring
In-Reply-To: <461DD0B7.2020009@wayfar.net>
References: <000401c77c37$de9b6580$fb01010a@superman>
	<Pine.GSO.4.60.0704111429210.17525@bigzilla.ece.gatech.edu>
	<461DD0B7.2020009@wayfar.net>
Message-ID: <Pine.GSO.4.60.0704121257520.18505@bigzilla.ece.gatech.edu>


> Theres some interesting PSU nfo on Tangentsoft for the headphone amp 
> projects, http://tangentsoft.net/elec/opamp-linreg.html
>
> This circuit is kind of interesting too, how the gnd is set up in this low 
> noise headphone amp,
> http://tangentsoft.net/audio/ppa/amp2/

Thanks, I got that bookmarked.

On power supplies... I've always assumed we'd be running off an MOTM or 
similar power supply. Getting into power supplies would take me too far 
off course, I think.

In terms of audiophile stuff, Marshall Leach covers stuff like that in his 
Audio Engineering class. Some of you may know his name from the "Leach 
Amp."

See http://users.ece.gatech.edu/~mleach/ece4445

his analog electronic course is great too

http://users.ece.gatech.edu/~mleach/ece3050

- Aaron

-----------------------------------------------------------------------------

Dr. Aaron Lanterman, Asst. Prof.
and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
College of Electri. and Comp. Eng.   Fax:    404-894-8363
Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
Atlanta, GA 30332                    Office: Centergy 5212



From lanterma at ece.gatech.edu  Thu Apr 12 19:07:24 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Thu, 12 Apr 2007 13:07:24 -0400 (EDT)
Subject: [sdiy] 300-400 hours student work
In-Reply-To: <20070412.112118.1012646927.cfmd@bredband.net>
References: <27965.88821.qm@web32715.mail.mud.yahoo.com>
	<20070412.112118.1012646927.cfmd@bredband.net>
Message-ID: <Pine.GSO.4.60.0704121306230.18505@bigzilla.ece.gatech.edu>


On Thu, 12 Apr 2007, Magnus Danielson wrote:

>>  somehow I get the feeling that the box did not
>> actually make it to the trash.
>
> If you where doing the trash in that building, either you would ask if 
> it really was trash, and if you got affirmative you would put it in the 
> trunk of your car.
>
> If a more normal cleaning guy does it, it will end up in the dumpster, 
> he would just see a cardboardbox full of junk and handle it properly.
>
> Such is life, and you need to handle it accordingly.

Yup... it was just a box of circuit boards with jacks and knobs hanging 
off of them. There'd be no way to know if you didn't already know that it 
was music related - and it would take a lot of time to turn any of it 
into useful instruments (making front panels, etc.)

- Aaron


From lanterma at ece.gatech.edu  Thu Apr 12 19:11:51 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Thu, 12 Apr 2007 13:11:51 -0400 (EDT)
Subject: [sdiy] May run class again this Spring
In-Reply-To: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
Message-ID: <Pine.GSO.4.60.0704121308100.18505@bigzilla.ece.gatech.edu>


On Thu, 12 Apr 2007, Josh Forgione wrote:

> Analog synthesizer building is now a very niche field.  College students 
> deserve educational opportunities to gain skills which are relevant in 
> the workplace.
...
> That's not to devalue the analog education.  The lessons learned via analog

I've sort of viewed it as trojan horse to bring back some of the art of 
analog... synthesizers happen to be an interesting application area. The 
other main goal of the course is to actually get the students building a 
circuit and making it work, which we do very little of in our program (or 
EE programs around the country nowdays.)

> fundamentally a person looking for a career in the audio industry will have 
> an easier time finding work with a digital/dsp background.   And I'm guessing 
...
> digital material.  Two courses if you can swing it.

The more I think about it the more I really want to do two courses - maybe 
one in the fall and one in the spring - with one focusing on DSP, maybe 
do some real-time programming...

- Aaron


From ijfritz at comcast.net  Thu Apr 12 19:26:59 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Thu, 12 Apr 2007 11:26:59 -0600
Subject: [sdiy] May run class again this Spring
In-Reply-To: <Pine.GSO.4.60.0704121308100.18505@bigzilla.ece.gatech.edu>
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
	<Pine.GSO.4.60.0704121308100.18505@bigzilla.ece.gatech.edu>
Message-ID: <6.2.1.2.2.20070412112337.020aaf90@mail.comcast.net>

At 11:11 AM 4/12/2007, Aaron Lanterman wrote:

>  The other main goal of the course is to actually get the students 
> building a circuit and making it work, which we do very little of in our 
> program (or EE programs around the country nowdays.)

I've interviewed many PhD EE's and only ever found *one* who knew the 
resistor color code.  He was an old time diy kid who had started building 
in high school.  In other words, he did not learn the color code by getting 
his EE degrees.

   Ian 



From rainer at buchty.net  Thu Apr 12 19:53:19 2007
From: rainer at buchty.net (Rainer Buchty)
Date: Thu, 12 Apr 2007 19:53:19 +0200 (CEST)
Subject: [sdiy] May run class again this Spring
In-Reply-To: <6.2.1.2.2.20070412112337.020aaf90@mail.comcast.net>
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
	<Pine.GSO.4.60.0704121308100.18505@bigzilla.ece.gatech.edu>
	<6.2.1.2.2.20070412112337.020aaf90@mail.comcast.net>
Message-ID: <Pine.LNX.4.63.0704121940400.6076@bibamobil.buchty.net>

> I've interviewed many PhD EE's and only ever found *one* who knew the 
> resistor color code.  He was an old time diy kid who had started 
> building in high school.  In other words, he did not learn the color 
> code by getting his EE degrees.

What do you expect?

Not sure, how it works in other countries, but in Germany universities 
are usually *proud* of the fact, that they only teach "concepts" and 
"methods", and anything else is left to the students as a voluntary 
spare-time assignment. Sometimes you even get the idea, that practical 
knowledge is something being frowned upon (and I still do remember how I 
was once criticized for having a "too engineer-like approach" during my 
time as a PhD student).

And with most of (mainstream-)EE nowadays taking place in the fields of 
FPGA design and/or DSP, I'm not too surprised that they know zilch about 
resistor color codes. 

Rainer



From harrybissell at copper.net  Thu Apr 12 20:52:44 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Thu, 12 Apr 2007 18:52:44 -0000
Subject: [sdiy] May run class again this Spring
Message-ID: <380-220074412185244362@copper.net>

Every now and then the Digital kids come to me
for assistance... Analog is NOT dead.  Just think of
how the experience of chasing a ground loop in and Audio
system can be applied to a data acquisition problem
in industry.

At the end of the day EVERYTHING is really analog.
Ones and zeros are just a convenient subset :^P

H^) harry




From synth at wayfar.net  Thu Apr 12 21:41:29 2007
From: synth at wayfar.net (Chris K)
Date: Thu, 12 Apr 2007 12:41:29 -0700
Subject: [sdiy] May run class again this Spring
In-Reply-To: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
Message-ID: <461E8B69.1030000@wayfar.net>

Josh Forgione wrote:

> My $0.02-
>
> Analog synthesizer building is now a very niche field.  College 
> students deserve educational opportunities to gain skills which are 
> relevant in the workplace.
>
> That's not to devalue the analog education.  The lessons learned via 
> analog design are priceless, especially if you want to be a hardware 
> engineer.  But fundamentally a person looking for a career in the 
> audio industry will have an easier time finding work with a 
> digital/dsp background.   


So they can learn how to emulate analog circuits... poorly.

- ck


From Barry.L.Klein at wdc.com  Thu Apr 12 23:23:17 2007
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Thu, 12 Apr 2007 14:23:17 -0700
Subject: [sdiy] test message
In-Reply-To: <461E8B69.1030000@wayfar.net>
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
	<461E8B69.1030000@wayfar.net>
Message-ID: <6B16794FD98610449F66759BBF503D40557DFA@wdscexbe03.sc.wdc.com>

test again



From obl64 at ix.netcom.com  Fri Apr 13 00:32:29 2007
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Thu, 12 Apr 2007 15:32:29 -0700
Subject: [sdiy] May run class again this Spring
In-Reply-To: <380-220074412185244362@copper.net>
References: <380-220074412185244362@copper.net>
Message-ID: <461EB37D.2010600@ix.netcom.com>

harrybissell at copper.net wrote:
> Every now and then the Digital kids come to me
> for assistance... Analog is NOT dead.  Just think of
> how the experience of chasing a ground loop in and Audio
> system can be applied to a data acquisition problem
> in industry.
> 
> At the end of the day EVERYTHING is really analog.
> Ones and zeros are just a convenient subset :^P
> 
> H^) harry
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 

"1" is an euphemism for "Somewhere near Vcc and, dammit, I don't know 
exactly!".
"0" is an euphemism for "Somewhere near ground and, dammit, I don't know 
exactly!".
Everything else in between? Well, better run and fetch someone who 
speaks BBROYGBVGW (resistor color code)...

- Oren


From cfmd at bredband.net  Fri Apr 13 00:54:04 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Fri, 13 Apr 2007 00:54:04 +0200 (CEST)
Subject: [sdiy] May run class again this Spring
In-Reply-To: <461EB37D.2010600@ix.netcom.com>
References: <380-220074412185244362@copper.net>
	<461EB37D.2010600@ix.netcom.com>
Message-ID: <20070413.005404.615034744.cfmd@bredband.net>

From: Oren Leavitt <obl64 at ix.netcom.com>
Subject: Re: [sdiy] May run class again this Spring
Date: Thu, 12 Apr 2007 15:32:29 -0700
Message-ID: <461EB37D.2010600 at ix.netcom.com>

> harrybissell at copper.net wrote:
> > Every now and then the Digital kids come to me
> > for assistance... Analog is NOT dead.  Just think of
> > how the experience of chasing a ground loop in and Audio
> > system can be applied to a data acquisition problem
> > in industry.
> > 
> > At the end of the day EVERYTHING is really analog.
> > Ones and zeros are just a convenient subset :^P
> > 
> > H^) harry
> > 
> > 
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > 
> 
> "1" is an euphemism for "Somewhere near Vcc and, dammit, I don't know 
> exactly!".
> "0" is an euphemism for "Somewhere near ground and, dammit, I don't know 
> exactly!".
> Everything else in between? Well, better run and fetch someone who 
> speaks BBROYGBVGW (resistor color code)...

When I see "digital" I see things like just how fast or slow '0' becomes '1'
or vice versa. When a single '0' or '1' is about 100 ps this is pretty darn
quick, and you bet your digital ass that it is highly analogue! Capacitance,
inductance, impedance, reflexes, bandwidth, loss, noise injection.....

Oh, and everything is clocked with a "stable" clock source. Ha!

Phase and Frequency is one of the most difficult things to have the digital
guys to understand. Especially when it is not exactly the same, and shifting
around a little etc. The digital guys only see X and X+1 cycles. :(

Cheers,
Magnus


From jbuckf50 at hotmail.com  Fri Apr 13 02:37:55 2007
From: jbuckf50 at hotmail.com (Josh Forgione)
Date: Fri, 13 Apr 2007 00:37:55 +0000
Subject: [sdiy] May run class again this Spring
In-Reply-To: <Pine.GSO.4.60.0704121308100.18505@bigzilla.ece.gatech.edu>
Message-ID: <BAY144-F35077A4F8D0A18973736D8D95D0@phx.gbl>

You know, I wasn't clear here when I said two courses.  I was actually 
supporting the idea proposed earlier in the thread to have two courses: one 
analog and the next digital.

My original point was not bashing analog in any way whatsoever.  I was 
merely reinforcing the original post's concern that the digital stuff was 
getting shortchanged at the end of the semester since it was crammed into 
one course.

As an aside, I'm an EE and I consider myself an _electronics_ designer - 
digital, analog, whatever.  I think the digital vs. analog debate is sort of 
irrelevant.

I did not intend for this to turn into a digital vs. analog debate, and I 
apologize if my lack of clarity lead us OT.

Josh


>From: Aaron Lanterman <lanterma at ece.gatech.edu>
>To: Josh Forgione <jbuckf50 at hotmail.com>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] May run class again this Spring
>Date: Thu, 12 Apr 2007 13:11:51 -0400 (EDT)
>
>
>On Thu, 12 Apr 2007, Josh Forgione wrote:
>
>>Analog synthesizer building is now a very niche field.  College students 
>>deserve educational opportunities to gain skills which are relevant in the 
>>workplace.
>...
>>That's not to devalue the analog education.  The lessons learned via 
>>analog
>
>I've sort of viewed it as trojan horse to bring back some of the art of 
>analog... synthesizers happen to be an interesting application area. The 
>other main goal of the course is to actually get the students building a 
>circuit and making it work, which we do very little of in our program (or 
>EE programs around the country nowdays.)
>
>>fundamentally a person looking for a career in the audio industry will 
>>have an easier time finding work with a digital/dsp background.   And I'm 
>>guessing
>...
>>digital material.  Two courses if you can swing it.
>
>The more I think about it the more I really want to do two courses - maybe 
>one in the fall and one in the spring - with one focusing on DSP, maybe do 
>some real-time programming...
>
>- Aaron

_________________________________________________________________
Get a FREE Web site, company branded e-mail and more from Microsoft Office 
Live! http://clk.atdmt.com/MRT/go/mcrssaub0050001411mrt/direct/01/



From synth at wayfar.net  Fri Apr 13 14:57:15 2007
From: synth at wayfar.net (Chris K)
Date: Fri, 13 Apr 2007 05:57:15 -0700
Subject: [sdiy] Half circles with Schaeffer Front Panel Designer?
Message-ID: <461F7E2B.7010605@wayfar.net>

How do you do half-circles using the Schaeffer Front Panel Designer 
software?

I tried using an upside down cap U, but it doesn't work very well.

http://www.wayfar.net/waveshape_panel_subsection.png

I haven't used HPGL objects before, I'd be willing to give it a try. Has 
anyone else run into this problem, what HPGL software did you use?

Thanks,
- ck


From synth1 at airmail.net  Fri Apr 13 15:30:42 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Fri, 13 Apr 2007 08:30:42 -0500
Subject: [sdiy] Live analog synth show in Philly the 21st
Message-ID: <005401c77dcf$f019e680$7800a8c0@bilbo>

> http://www.thegatherings.org:80/67gather.html
> 
> 2 great analog synth bands with people who can *actually play* keyboards :)
> 
> Highly recommended if you can make it to Philadelphia next Saturday.
> 
> Will have MOTM, Moog, A6 and others.
> 
> Paul S.
> in analog wasteland of north Texas
>


From synth at wayfar.net  Fri Apr 13 15:41:44 2007
From: synth at wayfar.net (Chris K)
Date: Fri, 13 Apr 2007 06:41:44 -0700
Subject: [sdiy] Half circles with Schaeffer Front Panel Designer?
In-Reply-To: <461F7E2B.7010605@wayfar.net>
References: <461F7E2B.7010605@wayfar.net>
Message-ID: <461F8898.60505@wayfar.net>

Found some nfo on sxlist,

http://www.sxlist.com/techref/language/pcl/lj1881.asc

Looks like : PD;AR0,100,180,90;PA;  saved to a .plt file works if I 
rotate it 90deg.

-ck


Chris K wrote:

> How do you do half-circles using the Schaeffer Front Panel Designer 
> software?
>
> I tried using an upside down cap U, but it doesn't work very well.
>
> http://www.wayfar.net/waveshape_panel_subsection.png
>
> I haven't used HPGL objects before, I'd be willing to give it a try. 
> Has anyone else run into this problem, what HPGL software did you use?
>
> Thanks,
> - ck
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From jonathan_science at hotmail.com  Fri Apr 13 22:33:18 2007
From: jonathan_science at hotmail.com (J P)
Date: Fri, 13 Apr 2007 16:33:18 -0400
Subject: [sdiy] x0xb0x power rails...
Message-ID: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>

How much extra current can I reasonably expect to tap off those regulators 
without causing problems?  I can add some wide heat sinks, no problem, and 
then if they still get hot, add some bigger ones.  Anybody dinked around 
with an x0xb0x or familiar enough with it to know?

As I recall, LFOs and EGs tend to draw lots of current....  Oscs a little 
less..  anyhoo...  just doing preliminary discovery :-)

Jonathan P.

_________________________________________________________________
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From don at till.com  Sat Apr 14 09:34:26 2007
From: don at till.com (Don Tillman)
Date: Sat, 14 Apr 2007 00:34:26 -0700
Subject: [sdiy] May run class again this Spring
In-Reply-To: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
	(jbuckf50@hotmail.com)
References: <BAY144-F29FCE2813515925B82900CD95E0@phx.gbl>
Message-ID: <m27isf8l4t.fsf@till.com>

   > From: "Josh Forgione" <jbuckf50 at hotmail.com>
   > Date: Thu, 12 Apr 2007 08:50:49 +0000
   > 
   > Analog synthesizer building is now a very niche field.  College
   > students deserve educational opportunities to gain skills which
   > are relevant in the workplace.

Huh?  Most college courses have no relevance to the workplace.  I
mean, they don't call it "academia" for nuthin'.

   > That's not to devalue the analog education.  The lessons learned
   > via analog design are priceless, especially if you want to be a
   > hardware engineer.

And other fields too... My day job is software engineering, and I'm
hiring right now, and if I see a resume with an EE background,
especially with some analog, I know that they applicant is not just
another software engineer with an an understanding that's been
abstracted, isolated and removed from the reality of how the processor
really works.  

(Yes, I'm serious; if you're looking for work in the San Francisco Bay
area and you have expertise in web-based UI software development, send
me a resume.)

   > But fundamentally a person looking for a career in the audio
   > industry will have an easier time finding work with a digital/dsp
   > background.  

More fundamentally, a person looking for a career in the audio
industry will have an easier time finding work in another industry.
:-)

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com


From synth at wayfar.net  Sat Apr 14 10:34:29 2007
From: synth at wayfar.net (Chris K)
Date: Sat, 14 Apr 2007 01:34:29 -0700
Subject: [sdiy] x0xb0x power rails...
In-Reply-To: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>
References: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>
Message-ID: <46209215.6080400@wayfar.net>


Look at the datasheet for the regulators, if its a typical T0-220 
package regulator usually they're rated for 1A.

http://www.datasheetarchive.com/index.html

Datasheet search.

J P wrote:

> How much extra current can I reasonably expect to tap off those 
> regulators without causing problems?  I can add some wide heat sinks, 
> no problem, and then if they still get hot, add some bigger ones.  
> Anybody dinked around with an x0xb0x or familiar enough with it to know?
>
> As I recall, LFOs and EGs tend to draw lots of current....  Oscs a 
> little less..  anyhoo...  just doing preliminary discovery :-)
>
> Jonathan P.
>
> _________________________________________________________________
> Mortgage rates near historic lows. Refinance $200,000 loan for as low 
> as $771/month* 
> https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h27f8&disc=y&vers=689&s=4056&p=5117 
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From seb at burnit.co.uk  Sat Apr 14 11:55:29 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Sat, 14 Apr 2007 10:55:29 +0100
Subject: [sdiy] x0xb0x power rails...
In-Reply-To: <46209215.6080400@wayfar.net>
References: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>
	<46209215.6080400@wayfar.net>
Message-ID: <4620A511.9010407@burnit.co.uk>

Although, how hot they get depends on the voltage drop as well.  For a 
higher input voltage you will need a bigger heat sink for the same current.


Chris K wrote:
>
> Look at the datasheet for the regulators, if its a typical T0-220 
> package regulator usually they're rated for 1A.
>
> http://www.datasheetarchive.com/index.html
>
> Datasheet search.
>
> J P wrote:
>
>> How much extra current can I reasonably expect to tap off those 
>> regulators without causing problems?  I can add some wide heat sinks, 
>> no problem, and then if they still get hot, add some bigger ones.  
>> Anybody dinked around with an x0xb0x or familiar enough with it to know?
>>
>> As I recall, LFOs and EGs tend to draw lots of current....  Oscs a 
>> little less..  anyhoo...  just doing preliminary discovery :-)
>>
>> Jonathan P.
>>
>> _________________________________________________________________
>> Mortgage rates near historic lows. Refinance $200,000 loan for as low 
>> as $771/month* 
>> https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h27f8&disc=y&vers=689&s=4056&p=5117 
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From tim.parkhurst at gmail.com  Sat Apr 14 23:49:14 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sat, 14 Apr 2007 14:49:14 -0700
Subject: [sdiy] A few Memorymoog questions
Message-ID: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>

A few questions about the Memorymoog voice card:

1) I noticed that the card uses 4066 switches for CV routing, but
4016s for the audio path (VCO 1 and 2 waveform select). Any particular
reason for this? My guess is that 4066s perform a little better, and
their lower Ron is a benefit for CVs, while the 4016 is less expensive
and worked just fine for the audio path. Right? Wrong?

2) The selected waves from VCOs 1 and 2 go into the inverting pin of
the audio summing amp (U12A), while VCO 3's signal gets inverted (this
signal is used as audio and as a CV source for "voice mod") and then
sent to the NON-inverting input of the audio summing amp. This
configuration is an interesting one, in that it saves one op amp, and
lets the inverted and non-inverted signals to be mixed (without
canceling). Is there a noticeable (audible) difference between a
standard inverting summer and a difference summer?

Although i doubt any one of these items is responsible for the sound
of the Memory (some say even better/warmer/phatter than the Mini), but
they may offer some clues.

And finally: I'm watching "The Mummy" and I'm noticing that Rachel
Weisz is a very beautiful woman... sorry, got distracted there. Guess
I drifted OT.


Tim (Go Kimi / Team Ferrari!) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From music.maker at gte.net  Sun Apr 15 02:14:06 2007
From: music.maker at gte.net (Scott Gravenhorst)
Date: Sat, 14 Apr 2007 17:14:06 -0700
Subject: [sdiy] GateMen Play Mozart Synth Quartet
Message-ID: <200704150014.l3F0E6nN001546@linux7.lan>


(c:

http://www.fpga.synth.net/pmwiki/uploads/FPGASynth/GateMen_Mozart_Synth_Quartet.mp3

PARDON MY NOISY STUDIO.

Here is a Mozart String Quartet done with 4 GateMan I FGPA monosynths

-- ScottG

---------------------------------------------------------

-- Someday is not on the calendar.

-- Scott Gravenhorst
-- Xilinx Spartan-3E Based Music Synthesizers
-- FatMan: home1.gte.net/res0658s/fatman/
-- NonFatMan: home1.gte.net/res0658s/electronics/




From ijfritz at comcast.net  Sun Apr 15 04:14:55 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Sat, 14 Apr 2007 20:14:55 -0600
Subject: [sdiy] Chaos Boards Shipping
In-Reply-To: <6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070406142634.022f08c8@mail.comcast.net>
Message-ID: <6.2.1.2.2.20070414200059.020a7230@mail.comcast.net>

Hello --

I decided to indeed have some boards made for this project, and they have 
arrived and been tested.  Several people have indicated an interest and 
will be getting boards this week.  If anyone else is interested they need 
to contact me (offlist, please) fairly soon, as it looks like these may not 
last long.

There was a question raised as to why there is no voltage control.  Since 
the chaos patterns change so rapidly with parameter variation, wide-range 
voltage control is not all that advantageous.  Since the circuit needs to 
be driven by an external source,  amplitude and frequency modulation of the 
source can be used to modulate the chaotic pattern.  The schematic I put up 
a while back for another system had voltage controlled rate and pattern, as 
do the more recent conplicated systems I have put together since then.

The current project is really a great way to get started with chaos.  And I 
am finding that cascading two of these circuits has some really interesting 
possibilities.

   Ian


>There is also a section with a new EZ circuit that requires just two 
>chips, but can demonstrate most of the features generally found in chaotic 
>systems.  This circuit has manual control of frequency and damping, and is 
>driven by an external oscillator, which could be a synth LFO.
>http://home.comcast.net/~ijfritz/ch_cir1.htm
>I am considering making boards available for this project, so please let 
>me know (off list) if you might be interested in obtaining one.



From don at till.com  Sun Apr 15 07:37:16 2007
From: don at till.com (Don Tillman)
Date: Sat, 14 Apr 2007 22:37:16 -0700
Subject: [sdiy] A few Memorymoog questions
In-Reply-To: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
	(tim.parkhurst@gmail.com)
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
Message-ID: <m2647y8agj.fsf@till.com>

   > Date: Sat, 14 Apr 2007 14:49:14 -0700
   > From: "Tim Parkhurst" <tim.parkhurst at gmail.com>
   > 
   > A few questions about the Memorymoog voice card:

Hey Tim,

   > 1) I noticed that the card uses 4066 switches for CV routing, but
   > 4016s for the audio path (VCO 1 and 2 waveform select). Any
   > particular reason for this? My guess is that 4066s perform a
   > little better, and their lower Ron is a benefit for CVs, while
   > the 4016 is less expensive and worked just fine for the audio
   > path. Right? Wrong?

Probably.

   > 2) The selected waves from VCOs 1 and 2 go into the inverting pin
   > of the audio summing amp (U12A), while VCO 3's signal gets
   > inverted (this signal is used as audio and as a CV source for
   > "voice mod") and then sent to the NON-inverting input of the
   > audio summing amp. This configuration is an interesting one, in
   > that it saves one op amp, and lets the inverted and non-inverted
   > signals to be mixed (without canceling). 

That's an interesting subtlety; 'good eye...

(I'll write this so that folks without a MemoryMoog schematic in front
of them will understand...)

Each Memorymoog voice has three VCO's, and each VCO has three
waveforms, and those waveforms are selected with three pushbutton
switches.  For VCO1 and VCO2, when you press more than one waveform
button the waveforms average, but for VCO3, when your press more than
one waveform button the waveforms arithmetically add.  This is because
VCO1 and VCO2 are dedicated to being audio sources and you want the
waveform buttons to change the timbre of the waveform without altering
the level.  VCO3 can be used either as audio or an LFO, so the having
the waveforms add makes more sense when VCO3 is a modulation source.

Also note that VCO1 and VCO2 are AC coupled while VCO3 is not.

The summing of the VCO3 waveforms adds an extra opamp inversion into
that path, so when the VCO's are summed together after their
individual VCA stages, that extra inversion is accounted for in that
audio summing stage that you noticed.

   > Is there a noticeable (audible) difference between a standard
   > inverting summer and a difference summer?

Yes, there are several differences.  One is that a standard inverting
summer isolates the inputs from each other, while with the difference
summer the noninverting input interact with each other and with the
inverting inputs.

   > And finally: I'm watching "The Mummy" and I'm noticing that
   > Rachel Weisz is a very beautiful woman... sorry, got distracted
   > there. Guess I drifted OT.

That depends, could there be a MemoryMoog in the soundtrack?

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com


From jhaible at debitel.net  Sun Apr 15 14:27:48 2007
From: jhaible at debitel.net (JH.)
Date: Sun, 15 Apr 2007 14:27:48 +0200
Subject: [sdiy] A few Memorymoog questions
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
	<m2647y8agj.fsf@till.com>
Message-ID: <000701c77f59$e9dd9ba0$0200a8c0@jhsilent>

>   > 1) I noticed that the card uses 4066 switches for CV routing, but
>   > 4016s for the audio path (VCO 1 and 2 waveform select). Any
>   > particular reason for this? My guess is that 4066s perform a
>   > little better, and their lower Ron is a benefit for CVs, while
>   > the 4016 is less expensive and worked just fine for the audio
>   > path. Right? Wrong?
>
>Probably.

While the 4066 has lower on-resistance, I _think_ the 4016 has less 
crosstalk when switched off.
The first is more important for CV, the latter more important for audio.

This is just from memory, so check the data sheets to be certain. (Gotta 
run; I'm on my way to Freiburg where I have a week of FPGA and VHDL training 
:) )

JH.



From louis at dompselaar.org  Sun Apr 15 14:41:13 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Sun, 15 Apr 2007 14:41:13 +0200
Subject: [sdiy] SSM2200
Message-ID: <46221D69.2070103@dompselaar.org>

I got a broken Wersi EX20 yesterday for next to nothing.  I know what's 
wrong with
it, but I'm weighing up fixing it against stripping it for parts.  Apart 
from three BBD
chips, several 3080 and some other interesting parts, there are two 
SSM2200 in
there.  However, I can't find any specs for that anywhere.  It appears 
to be a filter,
but I'm not sure.  Anyone?

Louis



From pfperry at melbpc.org.au  Sun Apr 15 15:11:59 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Sun, 15 Apr 2007 23:11:59 +1000
Subject: [sdiy] SSM2200
References: <46221D69.2070103@dompselaar.org>
Message-ID: <004001c77f5f$a6ecb5a0$5401a8c0@frostwave>

I've seen it suggested that it is a matched transistor pair,
but I can't find it in my data books from that period.
The SSM2210 and SSM2220 are duals.

paul perry melb australia


From louis at dompselaar.org  Sun Apr 15 15:45:52 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Sun, 15 Apr 2007 15:45:52 +0200
Subject: [sdiy] SSM2200
In-Reply-To: <004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
References: <46221D69.2070103@dompselaar.org>
	<004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
Message-ID: <46222C90.8070607@dompselaar.org>

They're a bit too large to be matched pairs (16 pin DIP).

This is how they are used:
http://www.dompselaar.org/SF/ex20_ssm2200.jpg

> I've seen it suggested that it is a matched transistor pair,
> but I can't find it in my data books from that period.
> The SSM2210 and SSM2220 are duals.



From synthbaron at tampabay.rr.com  Sun Apr 15 15:53:26 2007
From: synthbaron at tampabay.rr.com (Jay)
Date: Sun, 15 Apr 2007 09:53:26 -0400
Subject: [sdiy] SSM2200
In-Reply-To: <004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
References: <46221D69.2070103@dompselaar.org>
	<004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
Message-ID: <46222E56.1090902@tampabay.rr.com>

Paul Perry wrote:
> I've seen it suggested that it is a matched transistor pair,
> but I can't find it in my data books from that period.
> The SSM2210 and SSM2220 are duals.

http://pdf1.alldatasheet.com/datasheet-pdf/view/96411/ETC/SSM2100.html


From synthbaron at tampabay.rr.com  Sun Apr 15 15:55:32 2007
From: synthbaron at tampabay.rr.com (Jay)
Date: Sun, 15 Apr 2007 09:55:32 -0400
Subject: [sdiy] SSM2200
In-Reply-To: <004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
References: <46221D69.2070103@dompselaar.org>
	<004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
Message-ID: <46222ED4.9000801@tampabay.rr.com>

Okay, let's try this again:

http://www.ka-electronics.com/images/SSM/SSM2200.pdf


From romeo.fahl at gmail.com  Sun Apr 15 16:01:59 2007
From: romeo.fahl at gmail.com (Romeo Fahl)
Date: Sun, 15 Apr 2007 07:01:59 -0700
Subject: [sdiy] SSM2200
In-Reply-To: <46221D69.2070103@dompselaar.org>
References: <46221D69.2070103@dompselaar.org>
Message-ID: <d3a114240704150701i37f9ef2led5feec998061e53@mail.gmail.com>

It's a noise reduction IC:

http://www.ka-electronics.com/images/SSM/SSM2200.pdf


From louis at dompselaar.org  Sun Apr 15 16:06:03 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Sun, 15 Apr 2007 16:06:03 +0200
Subject: [sdiy] SSM2200
In-Reply-To: <46222ED4.9000801@tampabay.rr.com>
References: <46221D69.2070103@dompselaar.org>	<004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
	<46222ED4.9000801@tampabay.rr.com>
Message-ID: <4622314B.9000109@dompselaar.org>

Thanks
> Okay, let's try this again:
>
> http://www.ka-electronics.com/images/SSM/SSM2200.pdf 



From louis at dompselaar.org  Sun Apr 15 16:11:05 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Sun, 15 Apr 2007 16:11:05 +0200
Subject: [sdiy] SSM2200
In-Reply-To: <46222ED4.9000801@tampabay.rr.com>
References: <46221D69.2070103@dompselaar.org>	<004001c77f5f$a6ecb5a0$5401a8c0@frostwave>
	<46222ED4.9000801@tampabay.rr.com>
Message-ID: <46223279.2070003@dompselaar.org>

I have to admit that I did see references to noise reduction in the Google
search results but I just assumed that was something different and never
checked the links...
> Okay, let's try this again:
>
> http://www.ka-electronics.com/images/SSM/SSM2200.pdf 



From synth at wayfar.net  Sun Apr 15 17:13:49 2007
From: synth at wayfar.net (Chris K)
Date: Sun, 15 Apr 2007 08:13:49 -0700
Subject: [sdiy] IC storage foam sheets?
Message-ID: <4622412D.4080701@wayfar.net>

Does anyone know where to get that black foam for sorting / storing 
components? Hopefully something that will work with transistors / t0-220 
packages and dips ect.

The foam used to protect surface mount components is a different grade, 
too soft ect.

Thanks,
- ck


From synthbaron at tampabay.rr.com  Sun Apr 15 19:03:58 2007
From: synthbaron at tampabay.rr.com (Jay)
Date: Sun, 15 Apr 2007 13:03:58 -0400
Subject: [sdiy] IC storage foam sheets?
In-Reply-To: <4622412D.4080701@wayfar.net>
References: <4622412D.4080701@wayfar.net>
Message-ID: <46225AFE.3090901@tampabay.rr.com>

Chris K wrote:

> Does anyone know where to get that black foam for sorting / storing 
> components? Hopefully something that will work with transistors / t0-220 
> packages and dips ect.

This is what I have been using:

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=13864&searchValue=foam



From ijfritz at comcast.net  Sun Apr 15 19:36:10 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Sun, 15 Apr 2007 11:36:10 -0600
Subject: [sdiy] Chaos Boards Gone
In-Reply-To: <23506816.1176606331278.JavaMail.root@centrmwml06.mgt.cox.n
 et>
References: <23506816.1176606331278.JavaMail.root@centrmwml06.mgt.cox.net>
Message-ID: <6.2.1.2.2.20070415113033.0214df18@mail.comcast.net>

Hello --

Only a few people indicated interest in these boards when I first offered 
them, but now I have a large list of interested people -- way more than 
there are boards.  I'm keeping a list of folks who want them and will get 
another set made soon.  In the mean time I'll notify everyone who is 
getting one from this first batch.

   Ian




> > I decided to indeed have some boards made for this project, and they have
> > arrived and been tested.  Several people have indicated an interest and
> > will be getting boards this week.  If anyone else is interested they need
> > to contact me (offlist, please) fairly soon, as it looks like these may 
> not
> > last long.



From billbigrig at yahoo.com  Sun Apr 15 19:43:34 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Sun, 15 Apr 2007 10:43:34 -0700 (PDT)
Subject: [sdiy] ssdiy black foam sheets
Message-ID: <712541.38336.qm@web32712.mail.mud.yahoo.com>

howdy,

 I bought a 2' by 3' piece off ebat about a month ago
to make ribbon controllers. it cost about$6.
Rig

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 


From synthbaron at tampabay.rr.com  Sun Apr 15 20:21:16 2007
From: synthbaron at tampabay.rr.com (Jay)
Date: Sun, 15 Apr 2007 14:21:16 -0400
Subject: [sdiy] ssdiy black foam sheets
In-Reply-To: <712541.38336.qm@web32712.mail.mud.yahoo.com>
References: <712541.38336.qm@web32712.mail.mud.yahoo.com>
Message-ID: <46226D1C.2020400@tampabay.rr.com>

Please:

http://denonville.com/replytoeveryone.jpg


From tim.parkhurst at gmail.com  Mon Apr 16 01:59:23 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sun, 15 Apr 2007 16:59:23 -0700
Subject: [sdiy] A few Memorymoog questions
In-Reply-To: <m2647y8agj.fsf@till.com>
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
	<m2647y8agj.fsf@till.com>
Message-ID: <87441170704151659g39bce8c3w2deff7f9f227db8d@mail.gmail.com>

Hi Don,

On 4/14/07, Don Tillman <don at till.com> wrote:
>   > Date: Sat, 14 Apr 2007 14:49:14 -0700
>   > From: "Tim Parkhurst" <tim.parkhurst at gmail.com>
>   >
>   > A few questions about the Memorymoog voice card:
>
>
>For VCO1 and VCO2, when you press more than one waveform
> button the waveforms average, but for VCO3, when your press more than
> one waveform button the waveforms arithmetically add.
>
Ah, now I've noted that the "summing" amps (CEM3360 VCAs) for VCO1 and
VCO2 are non-inverting. Now this is a new one for me: It looks like
the summing node for the 3360 is a non-inverting pin, and no feedback
is used (at least, no external feedback). Could the same configuration
be used to acheive averaging of several signals with a regular op-amp
(without CV control of gain, of course)?

> Also note that VCO1 and VCO2 are AC coupled while VCO3 is not.
>
Right, I saw that. There are two distinct signal paths for the VCO3
signal (each with their own 3360 VCA), and it's a little curious that
even the audio signal path is not AC coupled. Well, curious to my eyes
at least.

> The summing of the VCO3 waveforms adds an extra opamp inversion into
> that path, so when the VCO's are summed together after their
> individual VCA stages, that extra inversion is accounted for in that
> audio summing stage that you noticed.
>
Again, more interesting stuff. This probably means that the sound from
VCO3 is slightly different from 1 and 2, especially as more than one
wave is selected.

>   > Is there a noticeable (audible) difference between a standard
>   > inverting summer and a difference summer?
>
> Yes, there are several differences.  One is that a standard inverting
> summer isolates the inputs from each other, while with the difference
> summer the noninverting input interact with each other and with the
> inverting inputs.
>
Interesting. If I can ever get this thing up and running, I'd like to
run a test where I can switch between a standard summing amp for all
three VCOs and the "stock" difference amp setup. Again, I'm told that
the Memorymoog gets a little more distortion and thickness than the
Mini when all three VCOs are used, and the internal mixer was set up
this way on purpose. Still, this voice card is absolutely packed with
extinct chips (3x 3340, 2x 3360, 2x 3080), so I'm going to be very
careful with it. I also wouldn't want to modify it in any permanent
way, in case it's needed to ressurect a Memorymoog some day.

>
>   > And finally: I'm watching "The Mummy" and I'm noticing that
>   > Rachel Weisz is a very beautiful woman... sorry, got distracted
>   > there. Guess I drifted OT.
>
> That depends, could there be a MemoryMoog in the soundtrack?
>
No, I'm pretty sure they used a MummoryMoog.


Tim (you know I had to say it) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From tim.parkhurst at gmail.com  Mon Apr 16 02:03:02 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Sun, 15 Apr 2007 17:03:02 -0700
Subject: [sdiy] A few Memorymoog questions
In-Reply-To: <000701c77f59$e9dd9ba0$0200a8c0@jhsilent>
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
	<m2647y8agj.fsf@till.com> <000701c77f59$e9dd9ba0$0200a8c0@jhsilent>
Message-ID: <87441170704151703m778ed8adl8dfef7e4df9439c5@mail.gmail.com>

Hi JH,

On 4/15/07, JH. <jhaible at debitel.net> wrote:
>
> While the 4066 has lower on-resistance, I _think_ the 4016 has less
> crosstalk when switched off.
> The first is more important for CV, the latter more important for audio.
>
> This is just from memory, so check the data sheets to be certain. (Gotta
> run; I'm on my way to Freiburg where I have a week of FPGA and VHDL training
> :) )
>
> JH.

This could very well be, but I still think it primarily came down to a
cost consideration because a 4066 is used for the VCO3 summing tasks.


Tim (only used for the simple tasks) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From nil at pressurepenetration.com  Mon Apr 16 03:18:45 2007
From: nil at pressurepenetration.com (Mike Fiction)
Date: Sun, 15 Apr 2007 21:18:45 -0400
Subject: [sdiy] FS: MOTM, Oakley and CGS Modules
Message-ID: <4622CEF5.5090809@pressurepenetration.com>

For Sale:

MOTM 800 - $180.00
MOTM 800 - $180.00
MOTM 190 - $280.00
OMS VCO (Stooge Panel) - $300.00
OMS VCO (Stooge Panel) - $300.00
OMS SVF (Stooge Panel - $250.00
MOTM POWER - $190.00
CGS WAVE MULTIPLIERS (Home made panel / no knobs on this one) - $230.00
CGS DIGITAL NOISE (Home made panel) - $100.00
CGS SYNTHACON VCF (Home made panel) - $190.00

See photos at: http://www.flickr.com/photos/fictronics/ 
<http://www.flickr.com/photos/fictronics/>

Prices do not include shipping from Ohio. I prefer Paypal.
They all work great - no issues at all, the home made panel ones I can
provide artwork (Corel) for the buyer to get stooge panels made if you
want.

I have been using them for the last couple years and they have been
awesome. However, I am selling my entire studio as I have not been
working on music at all in the last year and there's no reason to let
great gear sit wasted. Whomever buys, make something glorious with these!

- Mike Fiction


From xyzzy at sysabend.org  Mon Apr 16 04:21:09 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Sun, 15 Apr 2007 19:21:09 -0700
Subject: [sdiy] Las Vegas anyone?
Message-ID: <20070416022109.GL47569@moo.sysabend.org>

Tommorrow I fly to vegas for the first of several business trips.  I dont
know if I'll have much if any spare time this time, but in a month I'll be
back and then a few more trips after that.

Anyhow, anything cool and synth-related out there?  Clubs that have good
shows?  Good places to cruise for junk and parts? 

Sad that I'm the one from work that will be going to Vegas so often as I
dont care for Gambling, Strippers, or Stage Shows...

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From synth at charlielamm.com  Mon Apr 16 06:36:17 2007
From: synth at charlielamm.com (Synth)
Date: Sun, 15 Apr 2007 21:36:17 -0700
Subject: [sdiy] Las Vegas anyone?
References: <20070416022109.GL47569@moo.sysabend.org>
Message-ID: <001d01c77fe0$c6ecd480$dc00a8c0@clbig>

I don't know about SDIY stuff, but, the $3.99 all-you-can-eat lobster
dinners seem to be a thing of the past.


----- Original Message ----- 
From: "Tom Arnold" <xyzzy at sysabend.org>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, April 15, 2007 7:21 PM
Subject: [sdiy] Las Vegas anyone?


> Tommorrow I fly to vegas for the first of several business trips.  I dont
> know if I'll have much if any spare time this time, but in a month I'll be
> back and then a few more trips after that.
>
> Anyhow, anything cool and synth-related out there?  Clubs that have good
> shows?  Good places to cruise for junk and parts?
>
> Sad that I'm the one from work that will be going to Vegas so often as I
> dont care for Gambling, Strippers, or Stage Shows...
>
> -- 
>  -----------------------------------------------------------------
>  - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
>  - SynthGeek        -
>  - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
>  - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
>  -------------------- 
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From synth at charlielamm.com  Mon Apr 16 06:37:14 2007
From: synth at charlielamm.com (Synth)
Date: Sun, 15 Apr 2007 21:37:14 -0700
Subject: [sdiy] List home page, and links to your home pages
References: <46112259.8020902@xs4all.nl>
Message-ID: <002f01c77fe0$e816d200$dc00a8c0@clbig>

http://www.charlielamm.com/synth

Thanks....
----- Original Message ----- 
From: "Rick Jansen" <rick.jansen at xs4all.nl>
To: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, April 02, 2007 8:33 AM
Subject: [sdiy] List home page, and links to your home pages


> As the list home page I have: <http://dropmix.xs4all.nl/synth-diy/> with
> some rather ancient and dusty links.
> 
> Let me know if you want a link [added/removed/changed] there to your own
> home page, or the page with your synth-diy things.
> -- 
> Rick Jansen
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From Matthias.Herrmann at jeppesen.com  Mon Apr 16 07:54:16 2007
From: Matthias.Herrmann at jeppesen.com (Matthias.Herrmann at jeppesen.com)
Date: Mon, 16 Apr 2007 07:54:16 +0200
Subject: Fw: [sdiy] Half circles with Schaeffer Front Panel Designer?
Message-ID: <OFC81DC089.7E3A4BBC-ONC12572BF.0020562A-C12572BF.00208FB9@jeppesen.com>

synth-diy-bounces at dropmix.xs4all.nl wrote on 04/13/2007 02:57:15 PM:
> How do you do half-circles using the Schaeffer Front PanelDesigner 
> software?
> 
> I tried using an upside down cap U, but it doesn't work very well.
> 
> http://www.wayfar.net/waveshape_panel_subsection.png
> 
> I haven't used HPGL objects before, I'd be willing to give
> it a try. Has 
> anyone else run into this problem, what HPGL software did you use?

using HPGLs in Schaeffer FPD is a good way to reduce the costs of the 
panels.
i use HPGL for allmost all graphics (scales/waveform symbols).
for creating these HPGL objects i use a simple freeware: CadSTD.
CorelDraw has a hpgl export filter, too.

another way to reduce the cost of a panel is to type in text in columns as 
multiple rows - instead of creating a new text object for each row.
using black panels without colorfilling the objects will dramatically 
reduce the costs, too.

cheers,
matthias

www.modular.fonik.de

> 
> Thanks,
> - ck
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From chris at chrismusic.de  Mon Apr 16 10:40:08 2007
From: chris at chrismusic.de (ChristianH)
Date: Mon, 16 Apr 2007 10:40:08 +0200
Subject: [sdiy] A few Memorymoog questions
In-Reply-To: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
Message-ID: <20070416103516.A4C7.CHRIS@chrismusic.de>

On Sat, 14 Apr 2007 14:49:14 -0700 "Tim Parkhurst" <tim.parkhurst at gmail.com> wrote:

> And finally: I'm watching "The Mummy" and I'm noticing that Rachel
> Weisz is a very beautiful woman... sorry, got distracted there. Guess
> I drifted OT.

Well, as we all know, Memorymoogs are drifting as well when they're
getting hot - so it's definitely on topic ;-)

Christian



From abisset at dspaudio.com  Mon Apr 16 12:59:23 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Mon, 16 Apr 2007 03:59:23 -0700 (PDT)
Subject: [sdiy] serge bi-directional-router wiring help needed...
In-Reply-To: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>
References: <BAY111-F10C219CB5D099903E31BD0FD5D0@phx.gbl>
Message-ID: <Pine.LNX.4.58.0704160340390.21778@fourier>


Hey guys, I'm halfway through upgrading and re-paneling this serge system
and I'm stumped on the bi-directional router.  All serge pcb's i've seen
have ground connected at a pad labeled "W".  This baord doesn't have a W
pad.  It only has X,Y & Z..  which would be +12, +5 & -12v respectively.
Even more troubling is there are only 11 other pads besides X,Y & Z and
the bidirectional router has 12 I/O on the front panel!

The previous owner had Z connected to ground, Y part of the router and X
at +12v but it didn't seem to work right.  Thought I'd ask on list before
calling Rex.  I've started reading the lm3900 application notes, but
there's so many ways to use them and I'm not exactly a wizard with
schematics.

Anyway, if anyone knows how this pcb expects to be powered that'd be super
useful...

-anthony


From sasami at hotkey.net.au  Mon Apr 16 13:50:39 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Mon, 16 Apr 2007 21:50:39 +1000 (EST)
Subject: [sdiy] serge bi-directional-router wiring help needed...
Message-ID: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>

Official kit instructions (which amusingly fail to mention power! - that is
covered in the general instructions.)
http://www.cgs.synth.net/synth/serge/kit/bi-di_switch.html
Wiring as taken direct from my unit:
http://www.cgs.synth.net/synth/serge/bi_di_router.html

It has internal regulators giving the chip +7 and -7 volts. There is NO
ground connection. -7 volts is used instead of 0 volts.

Ken

>
>Hey guys, I'm halfway through upgrading and re-paneling this serge system
>and I'm stumped on the bi-directional router.  All serge pcb's i've seen
>have ground connected at a pad labeled "W".  This baord doesn't have a W
>pad.  It only has X,Y & Z..  which would be +12, +5 & -12v respectively.
>Even more troubling is there are only 11 other pads besides X,Y & Z and
>the bidirectional router has 12 I/O on the front panel!
>
>The previous owner had Z connected to ground, Y part of the router and X
>at +12v but it didn't seem to work right.  Thought I'd ask on list before
>calling Rex.  I've started reading the lm3900 application notes, but
>there's so many ways to use them and I'm not exactly a wizard with
>schematics.
>
>Anyway, if anyone knows how this pcb expects to be powered that'd be super
>useful...
>
>-anthony
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From synth1 at airmail.net  Tue Apr 17 06:24:28 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Mon, 16 Apr 2007 23:24:28 -0500
Subject: [sdiy] [FS] More synth books
Message-ID: <01d101c780a8$4b2426f0$7800a8c0@bilbo>

>> Selling off my collection of synth books (most of these I have had 20+ 
>> years). PayPal only, please email first to check availability.
>>
>> There are 2 prices listed: price with US shipping, and then price with 
>> foreign shipping.
>>
>> #1: Nearly MINT condition of the 1st Edition of Allen Strange's "Electronic 
>> Music". NOT A CHEAP REPRINT!! This is the "real thing", I bought it in 1974 
>> with birthday money. It cost $3.95 (the price is still stamped on the first 
>> page). The pages are *perfect*, the cover is ever so slightly worn in 1 spot 
>> because of sitting on the shelf (the cover uses a pinkish purple ink). I 
>> doubt there is a better copy anywhere. I will probably regret this 20 years 
>> from now :)
>>
>> $100/$125
>>
>> #2: Hal Chamberlin's "Musical Applications of Microprocessors", 1st edition. 
>> The book itself is MINT, there is the original slipcover which is only fair 
>> condition.
>>
>> $60/$75
>>
>> #3: 2 volumes set (copies) of the Aries Modular Service Manual. Schematics, 
>> wiring diagrams, patches, original price list, etc. In 2 softcover binders.
>>
>> $45/$55
>>
>> #4: Freeman String Synth Service manual (copy). I actually fixed 2 of these 
>> using the manual.
>>
>> $25/$35
>>
>> #5: RMI KCII (Keyboard Computer 2) Service Manual *original*. I had to lie 
>> out my a** to Allen Organ to get this.
>>
>> $25/$35
>>
>> #6: Thomas Henry's "Electronic Music Circuits: Vol 1 Reprints", original 
>> spiral bound.
>>
>> $25/$35
>>
>> #7: Cheetah MS-6 Owner's Manual (copy). NOT the Service Manual.
>>
>> $10/$18
>>
>> #8: Roland "The Synthesizer" boxed set of 4 manuals, all original, all mint 
>> condition. 2nd Edition with Green lettering (I also have a set with dark 
>> brown lettering...hmmmm....) For the 100M synth, but general enough for ANY 
>> modular. Lots of patch diagrams.
>>
>> $80/$100
>>
>> Again, send email to: synth1 at airmail.net
>>
>> Paul S.
>>
>>
>>
>
> 



From don at till.com  Tue Apr 17 09:48:38 2007
From: don at till.com (Don Tillman)
Date: Tue, 17 Apr 2007 00:48:38 -0700
Subject: [sdiy] A few Memorymoog questions
In-Reply-To: <87441170704151659g39bce8c3w2deff7f9f227db8d@mail.gmail.com>
	(tim.parkhurst@gmail.com)
References: <87441170704141449n5914b64eye9ceff3630d67394@mail.gmail.com>
	<m2647y8agj.fsf@till.com>
	<87441170704151659g39bce8c3w2deff7f9f227db8d@mail.gmail.com>
Message-ID: <m2zm57786h.fsf@till.com>

   > Date: Sun, 15 Apr 2007 16:59:23 -0700
   > From: "Tim Parkhurst" <tim.parkhurst at gmail.com>
   > 
   > Ah, now I've noted that the "summing" amps (CEM3360 VCAs) for
   > VCO1 and VCO2 are non-inverting. Now this is a new one for me: It
   > looks like the summing node for the 3360 is a non-inverting pin,
   > and no feedback is used (at least, no external feedback).

Um, that's not actually what's happening; there's no "summing node" in
the sense of a classic opamp inverting summer circuit.  Here the VCO
waveforms are simply switched on and off with the 4016's, and those
that are on are averaged together by the resistors, and that signal is
sent through the 3360 VCA.  The 3360 only does non-inverting
operation, and if you did apply negative feedback around it you would
lose most of the VCA function.

   > Could the same configuration be used to acheive averaging of
   > several signals with a regular op-amp (without CV control of
   > gain, of course)?

Sure.

   > Again, I'm told that the Memorymoog gets a little more distortion
   > and thickness than the Mini when all three VCOs are used, and the
   > internal mixer was set up this way on purpose.

I've never compared a MiniMoog to a MemoryMoog side by side, but I can
say for sure that the MemoryMoog is designed to have the VCO's
overdrive the VCF, and a bunch of factory patches make use of it.

And hey, it is kind of cool where you expect overdriving a stage to
add harmonics, but overdriving a smooth-clipping circuit with a
triangle wave will actually remove harmonics.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com


From seb at burnit.co.uk  Tue Apr 17 10:29:31 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Tue, 17 Apr 2007 09:29:31 +0100
Subject: [Fwd: Re: [sdiy] x0xb0x power rails...]
Message-ID: <4624856B.5060204@burnit.co.uk>

was meant for the list I think...

-------- Original Message --------
Subject: 	Re: [sdiy] x0xb0x power rails...
Date: 	Tue, 17 Apr 2007 09:18:55 +0200
From: 	Christian Bergmiller <cbergmiller at gmail.com>
To: 	Seb Francis <seb at burnit.co.uk>
References: 	<BAY111-F10C219CB5D099903E31BD0FD5D0 at phx.gbl> 
<46209215.6080400 at wayfar.net> <4620A511.9010407 at burnit.co.uk>



since LFOs are oscillators running at low frequencys they don't need
more power per se. It all depends on the design..
(this goes for EG as well)

try to measure the actual current draw in your x0xb0x

christian

2007/4/14, Seb Francis <seb at burnit.co.uk>:
> Although, how hot they get depends on the voltage drop as well.  For a
> higher input voltage you will need a bigger heat sink for the same current.
>
>
> Chris K wrote:
> >
> > Look at the datasheet for the regulators, if its a typical T0-220
> > package regulator usually they're rated for 1A.
> >
> > http://www.datasheetarchive.com/index.html
> >
> > Datasheet search.
> >
> > J P wrote:
> >
> >> How much extra current can I reasonably expect to tap off those
> >> regulators without causing problems?  I can add some wide heat sinks,
> >> no problem, and then if they still get hot, add some bigger ones.
> >> Anybody dinked around with an x0xb0x or familiar enough with it to know?
> >>
> >> As I recall, LFOs and EGs tend to draw lots of current....  Oscs a
> >> little less..  anyhoo...  just doing preliminary discovery :-)
> >>
> >> Jonathan P.
> >>
> >> _________________________________________________________________
> >> Mortgage rates near historic lows. Refinance $200,000 loan for as low
> >> as $771/month*
> >> https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h27f8&disc=y&vers=689&s=4056&p=5117
> >>
> >>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>




From yves.usson at imag.fr  Tue Apr 17 21:29:55 2007
From: yves.usson at imag.fr (yves usson)
Date: Tue, 17 Apr 2007 21:29:55 +0200
Subject: [sdiy] YUSYNTH module ERRATUM
Message-ID: <46252033.8060206@imag.fr>

ERRATUM

I have just made an update of my page concerning the GATEDELAY module, a 
resistor was mislabelled in the component layout diagrams, and there was 
mistake in the wiring diagram.

For those of you who are building it or intend to build it I invite to 
check the page and download the corrected drawings.

Sorry about that pals !
-- 
Yves Usson

http://yusynth.net


From harrybissell at copper.net  Tue Apr 17 22:54:03 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Tue, 17 Apr 2007 20:54:03 -0000
Subject: [sdiy] Interesting EDN article on capacitors
Message-ID: <380-22007421720543558@copper.net>

April 12, 2007
Kymberly Schmidt - Maxim Integrated Products

"Choose capacitor types to optimize PC sound quality"

It shows the distortions caused by progressively poorer
dielectrice...  with X7R being the best (of the bad)
The film capacitor blows the doors off all the ceramics.
Higher voltage is better, bigger physical size is better...
any surprises here ?   :^P

H^) harry




From billbigrig at yahoo.com  Wed Apr 18 02:00:35 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Tue, 17 Apr 2007 17:00:35 -0700 (PDT)
Subject: [sdiy] seiko ds-250 help
Message-ID: <202856.37544.qm@web32715.mail.mud.yahoo.com>

Howdy,

 Can anyone tell me how to operate a seiko ds-250?
Please contact me off-line. Thanx.
rig

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 


From mverbos at earthlink.net  Wed Apr 18 08:31:59 2007
From: mverbos at earthlink.net (mark verbos)
Date: Wed, 18 Apr 2007 02:31:59 -0400
Subject: [sdiy] voltage quantizers
Message-ID: <C520597A-3EC3-4780-B98B-F11FA80DAB59@earthlink.net>

Hi there,

I need to build an 8 channel quantizer for a friend. Nothing fancy,  
just semitone scale, but it must be quick. There has been a lot of  
talk about Chris List's ARP style quantizer over the years. Scott  
Stites recently did an updated version and had success, but I have  
been wondering. How fast is the action on these things?  Would it not  
be a better solution to multiplex 8 channels around an 8 bit AtoD  
followed directly by an 8 Bit DtoA? Has anyone done this? The Buchla  
MARF does something like this, but using a discrete flash converter.   
I'd think IC converters would be even faster.

Just hoping for some discussion...

Mark



From carsten at analog-monster.de  Wed Apr 18 09:52:39 2007
From: carsten at analog-monster.de (=?iso-8859-1?Q?Carsten_T=F6nsmann?=)
Date: Wed, 18 Apr 2007 09:52:39 +0200
Subject: [sdiy] voltage quantizers
References: <C520597A-3EC3-4780-B98B-F11FA80DAB59@earthlink.net>
Message-ID: <000501c7818e$8b3abc90$2ac2b8d9@ghana>


Hi Mark,

perhaps a 8-Bit to 6-Bit solution could work:

- Voltage reference e. g. 5V
- Input Voltage 0 to 5 V
- 8 bit ADC
- put the higher 6 bits to 8-bit DAC (DAC08) and connect the two LSBs to 
ground (so you don't need any computation / conversion)

The result is a division of 5V by 64 (2^6), not exactly 5 octaves, but 
nearly. Perhaps you can play around with voltage references and output 
amplification...

I use this effect in my UCVM module:

http://www.analog-monster.de/ucvm_en.html

Cheers

Carsten
Analog-Monster!
http://www.analog-monster.de/index_en.html

----- Original Message ----- 
From: "mark verbos" <mverbos at earthlink.net>
To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, April 18, 2007 8:31 AM
Subject: [sdiy] voltage quantizers


> Hi there,
>
> I need to build an 8 channel quantizer for a friend. Nothing fancy,  just 
> semitone scale, but it must be quick. There has been a lot of  talk about 
> Chris List's ARP style quantizer over the years. Scott  Stites recently 
> did an updated version and had success, but I have  been wondering. How 
> fast is the action on these things?  Would it not  be a better solution to 
> multiplex 8 channels around an 8 bit AtoD  followed directly by an 8 Bit 
> DtoA? Has anyone done this? The Buchla  MARF does something like this, but 
> using a discrete flash converter.   I'd think IC converters would be even 
> faster.
>
> Just hoping for some discussion...
>
> Mark
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From abisset at dspaudio.com  Wed Apr 18 12:57:26 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Wed, 18 Apr 2007 03:57:26 -0700 (PDT)
Subject: [sdiy] an old serge UI secret and a primordial question 
In-Reply-To: <000501c7818e$8b3abc90$2ac2b8d9@ghana>
References: <C520597A-3EC3-4780-B98B-F11FA80DAB59@earthlink.net>
	<000501c7818e$8b3abc90$2ac2b8d9@ghana>
Message-ID: <Pine.LNX.4.58.0704180344580.5352@fourier>


For years i'd wondered why the old serge systems have 2 outputs per
module given that banana's are naturally multing...  Tonight i understand.

It was a performance related provision.  If you've got a sound at an
output and you want to take it somewhere else and then disconnect the old
signal flow without losing continuity, you need 2 physical patching
points.  Multing would leave you with buried cables that could not be
disconnected without losing the signal or you could have hanging cables by
disconnecting at the input ( obnoxious ).  So, having 2 outputs makes
sense for a live performance system.

Now, i've been fascinated with phase differences between speakers creating
a sonic terrain within a room.  To experiment more with this concept
during performances I'm wanting each modules second output to be out of
phase..  90 degress seems optimal, so just an opamp would do the trick,
but there might be some simpler way.  Anyone have any suggestions for the
simplest fixed phase shift circuit?

Is there a type of transformer that will give me 90 rather than
180degrees?  without too much hf roll off?  Will a R/C combo accomplish
this better?  So trivial google couldn't find it.

-anhotep


From abisset at dspaudio.com  Wed Apr 18 13:15:28 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Wed, 18 Apr 2007 04:15:28 -0700 (PDT)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
Message-ID: <Pine.LNX.4.58.0704180406390.5352@fourier>

constantly humbled i am (not that i thought i knew anything)
i now understand how a r/c filter works... hahahaha

okay, but that'll only get me a phase shift amt that varies with
frequency which is way to complex for constructing an audio terrain
without dsp or autism.  so, back to coils and other such tricks.

so my question is narrowed.  how can we throw the phase of a
signal 90 degrees without it changing based on the a/c's frequency?

-glasnost


From pfperry at melbpc.org.au  Wed Apr 18 13:29:23 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Wed, 18 Apr 2007 21:29:23 +1000
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
Message-ID: <001801c781ac$d0d7a560$5401a8c0@frostwave>

Search for "dome filter".

----- Original Message ----- 
From: "Anthony Bisset" 
> so my question is narrowed.  how can we throw the phase of a
> signal 90 degrees without it changing based on the a/c's frequency?
> 



From abisset at dspaudio.com  Wed Apr 18 13:31:37 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Wed, 18 Apr 2007 04:31:37 -0700 (PDT)
Subject: [sdiy] rice on a vibrating metal plate
In-Reply-To: <Pine.LNX.4.58.0704180406390.5352@fourier>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
Message-ID: <Pine.LNX.4.58.0704180427100.5352@fourier>

http://www.youtube.com/watch?v=Zkox6niJ1Wc

one of the reasons i'm interested in playing with phase.
now, if we could just get all the people onto or into a metal plate...
i could stop composing and just watch.

dome filters are hard to apply, especially during early puberty

-a



From cfmd at bredband.net  Wed Apr 18 13:40:55 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 18 Apr 2007 13:40:55 +0200 (CEST)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <Pine.LNX.4.58.0704180406390.5352@fourier>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
Message-ID: <20070418.134055.331141280.cfmd@bredband.net>

From: Anthony Bisset <abisset at dspaudio.com>
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
Date: Wed, 18 Apr 2007 04:15:28 -0700 (PDT)
Message-ID: <Pine.LNX.4.58.0704180406390.5352 at fourier>

> constantly humbled i am (not that i thought i knew anything)
> i now understand how a r/c filter works... hahahaha
> 
> okay, but that'll only get me a phase shift amt that varies with
> frequency which is way to complex for constructing an audio terrain
> without dsp or autism.  so, back to coils and other such tricks.
> 
> so my question is narrowed.  how can we throw the phase of a
> signal 90 degrees without it changing based on the a/c's frequency?

It is kind of hard. The trick you can do is to delay the signal in two
different variants, which has 90 degrees between them. This is what the dome
filter of a frequency shifter does for instance. You can also use the polyphase
filters for this purpose.

Cheers,
Magnus


From cfmd at bredband.net  Wed Apr 18 13:45:22 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 18 Apr 2007 13:45:22 +0200 (CEST)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <001801c781ac$d0d7a560$5401a8c0@frostwave>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
	<001801c781ac$d0d7a560$5401a8c0@frostwave>
Message-ID: <20070418.134522.-446303467.cfmd@bredband.net>

From: "Paul Perry" <pfperry at melbpc.org.au>
Subject: Re: [sdiy] r/c phase shift on face (esoterica could save the pie)
Date: Wed, 18 Apr 2007 21:29:23 +1000
Message-ID: <001801c781ac$d0d7a560$5401a8c0 at frostwave>

> Search for "dome filter".

J?rgen Haibles Frequency Shifters:
http://jhaible.heim.at/tonline_stuff/hj_fs.html

the Bode Frequency Shifter:
http://rubidium.dyndns.org/~magnus/synths/companies/moog/

and Mike Gingells PhD and supporting articles:
http://rubidium.dyndns.org/~magnus/synths/friends/gingell/

and that's from J?rgens and mine webpages. Enjoy!

Cheers,
Magnus

> ----- Original Message ----- 
> From: "Anthony Bisset" 
> > so my question is narrowed.  how can we throw the phase of a
> > signal 90 degrees without it changing based on the a/c's frequency?
> > 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From abisset at dspaudio.com  Wed Apr 18 14:01:39 2007
From: abisset at dspaudio.com (Anthony Bisset)
Date: Wed, 18 Apr 2007 05:01:39 -0700 (PDT)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <20070418.134522.-446303467.cfmd@bredband.net>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
	<001801c781ac$d0d7a560$5401a8c0@frostwave>
	<20070418.134522.-446303467.cfmd@bredband.net>
Message-ID: <Pine.LNX.4.58.0704180454550.5352@fourier>

so, 1:1 audio transformer wired reverse polarity will give us 180 degrees
consistently across all frequencies (degradation notwithstanding)?

if a dome filter is the only way to get 90 then this is becoming a
question of how bawdly i want an exact phase shift. as i imagined having
each module (count is now around 60) with a 90degree phase shifted
output, i may  have to rethink or compromise.

thanks for the suggestions!


From cfmd at bredband.net  Wed Apr 18 14:14:00 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 18 Apr 2007 14:14:00 +0200 (CEST)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <Pine.LNX.4.58.0704180454550.5352@fourier>
References: <001801c781ac$d0d7a560$5401a8c0@frostwave>
	<20070418.134522.-446303467.cfmd@bredband.net>
	<Pine.LNX.4.58.0704180454550.5352@fourier>
Message-ID: <20070418.141400.-876054841.cfmd@bredband.net>

From: Anthony Bisset <abisset at dspaudio.com>
Subject: Re: [sdiy] r/c phase shift on face (esoterica could save the pie)
Date: Wed, 18 Apr 2007 05:01:39 -0700 (PDT)
Message-ID: <Pine.LNX.4.58.0704180454550.5352 at fourier>

Anthony,

> so, 1:1 audio transformer wired reverse polarity will give us 180 degrees
> consistently across all frequencies (degradation notwithstanding)?

Indeed. An op-amp (say NE5534) and two resistors (say 47 kOhm) will do the same
job but much cheaper.

> if a dome filter is the only way to get 90 then this is becoming a
> question of how bawdly i want an exact phase shift. as i imagined having
> each module (count is now around 60) with a 90degree phase shifted
> output, i may  have to rethink or compromise.

Certainly. The dome filters is indeed one of the costs and places where
compromises occurs. The Polyphase filters may have a very attractive cost.
Do look at them! Interesting interconnections of resistors and capacitors,
with suitable buffers in and out.

> thanks for the suggestions!

Anytime!

Cheers,
Magnus


From harrybissell at copper.net  Wed Apr 18 15:41:19 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 18 Apr 2007 13:41:19 -0000
Subject: [sdiy] voltage quantizers
Message-ID: <380-220074318134119414@copper.net>

The Chris List design works OK, but it has some problems
imho

The best way to do it is to add a D flip-flop to the comparator
output that clocks on the opposite edge of the counter advance signal.

This way, the analog voltage is stable for 1/2 clock cycle before the
S/H is clocked. This works MUCH better.  I have built this and used
it for a while.

For an 8 channel circuit, you can use one counter and eight S/H...
but the results may be skewed by the number of clock cycles between
latches.

Is that a problem ?

My quantizer uses an A/D - D/A circuit.  But an eight channel would
be messy...

H^) harry
>
>
>---- Original Message ----
>From: mverbos at earthlink.net
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] voltage quantizers
>Date: Wed, 18 Apr 2007 02:31:59 -0400
>
>>Hi there,
>>
>>I need to build an 8 channel quantizer for a friend. Nothing fancy, 
>
>>just semitone scale, but it must be quick. There has been a lot of  
>>talk about Chris List's ARP style quantizer over the years. Scott  
>>Stites recently did an updated version and had success, but I have  
>>been wondering. How fast is the action on these things?  Would it
>not  
>>be a better solution to multiplex 8 channels around an 8 bit AtoD  
>>followed directly by an 8 Bit DtoA? Has anyone done this? The Buchla
> 
>>MARF does something like this, but using a discrete flash converter.
>  
>>I'd think IC converters would be even faster.
>>
>>Just hoping for some discussion...
>>
>>Mark
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From jmahoney at gate.net  Wed Apr 18 16:40:05 2007
From: jmahoney at gate.net (John Mahoney)
Date: Wed, 18 Apr 2007 10:40:05 -0400
Subject: [sdiy] an old serge UI secret and a primordial question 
In-Reply-To: <Pine.LNX.4.58.0704180344580.5352@fourier>
References: <C520597A-3EC3-4780-B98B-F11FA80DAB59@earthlink.net>
	<000501c7818e$8b3abc90$2ac2b8d9@ghana>
	<Pine.LNX.4.58.0704180344580.5352@fourier>
Message-ID: <20070418144001.NEGO8957.ibm58aec.bellsouth.net@VAIO.gate.net>

At 06:57 AM 4/18/2007, Anthony Bisset wrote:

>...  So, having 2 outputs makes
>sense for a live performance system.

Or, you can make sure that the plug that will need to be removed is 
plugged in last, so that you can remove it without disturbing the others.


>...  90 degress seems optimal, so just an opamp would do the trick,

Well, a 180 degree phase change (actually polarity inversion) is 
trivial with one op amp. 90 degrees is not quite so trivial, as far as I know.

Phase shifters ("phasers") use a number of all pass filters to, uh, 
shift the phase. So I guess I'm saying that you should study some 
phase shifters. (Ray Wilson and others sell phaser PC boards, maybe 
you could modify one for your purposes.)

Also, check out the IBP Analog Phase Alignment Tool (and Junior) from 
Little Labs:
         http://www.littlelabs.com/ibp.html
         http://www.littlelabs.com/ibpjr.html
--
john


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.446 / Virus Database: 269.5.2/766 - Release Date: 4/18/2007 7:39 AM




From harrybissell at copper.net  Wed Apr 18 17:26:40 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Wed, 18 Apr 2007 15:26:40 -0000
Subject: [sdiy] an old serge UI secret and a primordial question 
Message-ID: <380-22007431815264096@copper.net>

One phase shifter stage can shift 90 degrees
at a single frequency.

Getting "all" frequencies shifted requires
a bunch of cascaded stages. The dome filter
has a phase difference of 90 degrees, but overall
the shift is in the thousancds of degrees.

The lower the frequency you want the filter
to work at, the more stages you need and the
longer the total delay is as you go through the
filter. This could be in the tens of milliseconds
range.

I wanted to frequency shift a guitar up, and detect the
pitch faster. Trouble was the dome filter introduced
the same delay I'd get from the fundamental itself,
or worse. 

There is no free lunch...  :^P

H^) harry




>
>
>
>---- Original Message ----
>From: jmahoney at gate.net
>To: abisset at dspaudio.com, synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] an old serge UI secret and a primordial question 
>Date: Wed, 18 Apr 2007 10:40:05 -0400
>
>>At 06:57 AM 4/18/2007, Anthony Bisset wrote:
>>
>>>...  So, having 2 outputs makes
>>>sense for a live performance system.
>>
>>Or, you can make sure that the plug that will need to be removed is 
>>plugged in last, so that you can remove it without disturbing the
>others.
>>
>>
>>>...  90 degress seems optimal, so just an opamp would do the trick,
>>
>>Well, a 180 degree phase change (actually polarity inversion) is 
>>trivial with one op amp. 90 degrees is not quite so trivial, as far
>as I know.
>>
>>Phase shifters ("phasers") use a number of all pass filters to, uh, 
>>shift the phase. So I guess I'm saying that you should study some 
>>phase shifters. (Ray Wilson and others sell phaser PC boards, maybe 
>>you could modify one for your purposes.)
>>
>>Also, check out the IBP Analog Phase Alignment Tool (and Junior)
>from 
>>Little Labs:
>>         http://www.littlelabs.com/ibp.html
>>         http://www.littlelabs.com/ibpjr.html
>>--
>>john
>>
>>
>>-- 
>>No virus found in this outgoing message.
>>Checked by AVG Free Edition.
>>Version: 7.5.446 / Virus Database: 269.5.2/766 - Release Date:
>4/18/2007 7:39 AM
>>
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From tim.parkhurst at gmail.com  Wed Apr 18 17:26:55 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Wed, 18 Apr 2007 08:26:55 -0700
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <Pine.LNX.4.58.0704180406390.5352@fourier>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
Message-ID: <87441170704180826m78fe96d3ma18758669b350221@mail.gmail.com>

On 4/18/07, Anthony Bisset <abisset at dspaudio.com> wrote:
> constantly humbled i am (not that i thought i knew anything)
> i now understand how a r/c filter works... hahahaha
>
> okay, but that'll only get me a phase shift amt that varies with
> frequency which is way to complex for constructing an audio terrain
> without dsp or autism.  so, back to coils and other such tricks.
>
> so my question is narrowed.  how can we throw the phase of a
> signal 90 degrees without it changing based on the a/c's frequency?
>
> -glasnost

One problem with a 90 degree shift: the 'delay' between the shifted
and unshifted signals required to get a 90 degree shift is going to be
frequency dependant. 90 degrees at 1KHz is a different amount of time
than 90 degrees at 1.5KHz. A 180 degree shift is a different animal.
This can be achieved by simply inverting the signal. If you tried to
do a 180 degree shift by delaying the signal, then it would also be
frequency dependant.


Tim (don't quote me on any of this, I haven't had my coffee yet) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From debus at cityweb.de  Wed Apr 18 18:09:17 2007
From: debus at cityweb.de (Ingo Debus)
Date: Wed, 18 Apr 2007 18:09:17 +0200
Subject: [sdiy] an old serge UI secret and a primordial question 
In-Reply-To: <Pine.LNX.4.58.0704180344580.5352@fourier>
References: <C520597A-3EC3-4780-B98B-F11FA80DAB59@earthlink.net>
	<000501c7818e$8b3abc90$2ac2b8d9@ghana>
	<Pine.LNX.4.58.0704180344580.5352@fourier>
Message-ID: <1C45AD74-5C91-4DC3-BD03-A5404017CE94@cityweb.de>


Am 18.04.2007 um 12:57 schrieb Anthony Bisset:

> Now, i've been fascinated with phase differences between speakers  
> creating
> a sonic terrain within a room.  To experiment more with this concept
> during performances I'm wanting each modules second output to be  
> out of
> phase..

I'm not sure what a sonic terrain is... do you really need a  
frequency independent phase shift rather than a constant time delay?  
The propagation speed of sound in air is pretty much frequency  
independent (well, almost, there is dispersion), so to create the  
illusion that a sound source is nearer or farer away would require a  
constant delay, no?

Ingo


From johnspeth at yahoo.com  Wed Apr 18 18:45:06 2007
From: johnspeth at yahoo.com (John Speth)
Date: Wed, 18 Apr 2007 09:45:06 -0700 (PDT)
Subject: [sdiy] voltage quantizers
In-Reply-To: <380-220074318134119414@copper.net>
Message-ID: <628365.97313.qm@web53305.mail.re2.yahoo.com>

> The Chris List design works OK, but it has some
> problems
> imho

I did a PIC based quantizer based on Chris List's
circuit.  Mine has one deficiency: it chatters between
quantized voltages due to noise.  Comparator
hysteresis reduces the problem but it's a tradeoff in
accuracy.  I wonder if chattering is a major problem
with C List's.

Take a look at:

http://mysite.verizon.net/jspeth/Quantizer/Quantizer.htm

Conversion time is fast (depends on the meaning of
fast).  It's expandable by changing the code a bit and
adding more sample/holds.

If I had to do it all over again, I'd use an
ADC/Micro/DAC chain.  Then deal with noise and chatter
in software.

JJS


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 


From maza at maza.fi  Wed Apr 18 19:45:54 2007
From: maza at maza.fi (Matti Kari)
Date: Wed, 18 Apr 2007 20:45:54 +0300
Subject: [sdiy] SCI Pro-One problem (audio leaks to CV or something)
Message-ID: <46265952.8000009@maza.fi>

Hello,

my first post to the first & quick introduction first: I'm 25 years old 
rocker from Helsinki, Finland. I've been doing some electronics DIY 
before but mostly with tubes (practically some guitar / organ / electric 
piano amps). I am also planning to build my own modular synth someday, 
mostly with tubes on the signal path, etc.

Anyway, to the subject itself:

I have an SCI Pro-One which has the following problem: when the filter 
cutoff CV is between some specific value (say: cutoff pot between 11 
o'clock and 3 o'clock with no other CV's applied), signal from 
oscillator 1 and / or noise source seems to be leaking so the filter CV 
or something.

Please listen to this mp3: http://maza.fi/tmp/pro-one-noisyfilter.mp3
The filter is swept using the EG on this example.

Does anyone have ideas what could cause this? Feeding the 3320 filter 
straight from cutoff pot works fine and I've even swapped that chip, so 
it can't be that one. Also I've replaced all the resistors and the quad 
opamp that has the filter CV summing amp but the problem stays.

Any ideas?

Just a note: I've also replaced the PSU electrolytics to fresh ones and 
those on signal path were changed to plastic ones to improve reliability.

Thanks in advance & best regards,

Matti

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.


From maza at maza.fi  Wed Apr 18 19:51:39 2007
From: maza at maza.fi (Matti Kari)
Date: Wed, 18 Apr 2007 20:51:39 +0300
Subject: [sdiy] SCI Pro-One problem (audio leaks to CV or something)
Message-ID: <46265AAB.7000302@maza.fi>

I forgot a couple of things:

I've also tried to remove all the other incoming CV's (desoldered one 
end of the resistors) to the CV mixer except for the signal coming from 
cutoff pot (which was verified to be ok). Thus, the noise seems to be 
coming from the -15V line. I also tried to feed the -15V input resistor 
straight from the output pin of the regulator with a jumper cable 
without success.

The Pro-One schematics can be found at 
http://machines.hyperreal.org/manufacturers/Sequential/Pro-One/schematics/

The filter CV section is on page 2.

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.



From synth at wayfar.net  Wed Apr 18 20:02:15 2007
From: synth at wayfar.net (Chris K)
Date: Wed, 18 Apr 2007 11:02:15 -0700
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <Pine.LNX.4.58.0704180406390.5352@fourier>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
Message-ID: <46265D27.1070602@wayfar.net>

I don't know how much this will help, since its R/C based, but theres a 
good circuit and information on page 78 in "The Art of Electronics" that 
covers a variable phase 0 to 180deg.

- ck


Anthony Bisset wrote:

>constantly humbled i am (not that i thought i knew anything)
>i now understand how a r/c filter works... hahahaha
>
>okay, but that'll only get me a phase shift amt that varies with
>frequency which is way to complex for constructing an audio terrain
>without dsp or autism.  so, back to coils and other such tricks.
>
>so my question is narrowed.  how can we throw the phase of a
>signal 90 degrees without it changing based on the a/c's frequency?
>
>-glasnost
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>  
>



From cfmd at bredband.net  Wed Apr 18 20:50:56 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 18 Apr 2007 20:50:56 +0200 (CEST)
Subject: [sdiy] r/c phase shift on face (esoterica could save the pie)
In-Reply-To: <46265D27.1070602@wayfar.net>
References: <20070416115039.487C88BC2F5@mailout2.hotkey.net.au>
	<Pine.LNX.4.58.0704180406390.5352@fourier>
	<46265D27.1070602@wayfar.net>
Message-ID: <20070418.205056.-451323383.cfmd@bredband.net>

From: Chris K <synth at wayfar.net>
Subject: Re: [sdiy] r/c phase shift on face (esoterica could save the pie)
Date: Wed, 18 Apr 2007 11:02:15 -0700
Message-ID: <46265D27.1070602 at wayfar.net>

> I don't know how much this will help, since its R/C based, but theres a 
> good circuit and information on page 78 in "The Art of Electronics" that 
> covers a variable phase 0 to 180deg.

That is one of many forms of the polyphase filter I was mentioning. It looks
strangely bizare compared to normal filters, but if you read up on
Mike Gingells PhD and supporting articles (read them first), you might
finally get it. The Art of Electronics doesn't properly refer to it.
Here is a drawing without any values assigned:
http://users.vnet.net/gingell/polyphas/polyphas.html

Hans Summers have used it in radio filters (he has schematics too):
http://www.hanssummers.com/radio/polyphase/index.htm

Further reading which also might be of interest is that of Pim Niessen:
http://home.planet.nl/~niess153/Polyphase_networks.htm
He also has an Excel spreadsheat to calculate with. A bit complex, so one
probably needs to read the paper.

Cheers,
Magnus


From dalenkarl at yahoo.se  Thu Apr 19 15:28:00 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 19 Apr 2007 15:28:00 +0200 (CEST)
Subject: SV: [sdiy] rice on a vibrating metal plate
In-Reply-To: <Pine.LNX.4.58.0704180427100.5352@fourier>
Message-ID: <101907.86125.qm@web27606.mail.ukl.yahoo.com>

Your interested in resonance within material!

KD
--- Anthony Bisset <abisset at dspaudio.com> skrev:

> http://www.youtube.com/watch?v=Zkox6niJ1Wc
> 
> one of the reasons i'm interested in playing with phase.
> now, if we could just get all the people onto or into a metal plate...
> i could stop composing and just watch.
> 
> dome filters are hard to apply, especially during early puberty
> 
> -a
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      
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From dalenkarl at yahoo.se  Thu Apr 19 15:36:55 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 19 Apr 2007 15:36:55 +0200 (CEST)
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <46265D27.1070602@wayfar.net>
Message-ID: <953612.5462.qm@web27608.mail.ukl.yahoo.com>

With the old polys some users complains about that the next note plated
dont sound like the previous played, it depends on the poly alg used
off course,whether its voice repeat or step trough all voices at each note
etc.Users of the Andromeda complaints about this particularely when
FM a filter from a VCO or VCO to VCO.I also remember DX7 users had some
minor issues about phase cancellation who could silence a particular note
down a bit.

Also people of single oscillator polys almost never complaints about
polyphonic tonal dissorder compared to 2 or more oscillator per voice polys.
Perhaps because that its easier to hear the disorder of 2 oscillators
for then same voice compared to the one oscillator based chord? No?

For example i never had read anywhere that synths based on CEM3394 would have
more of the disorder between notes in a chord then of lets say a JP8 or a P5?

But isn't this actually a normal situation to have certain amount of polyphonic
tonal disorder!?

Take a piano, a single note consist of several strings there are all kinds of
phase cancellations going during the time of the decay of the note played,or
take a guitarist playing a chord the higher notes dampens out more rapid then
the lower played in a chord. No?

Why is it so that just because its a synth the variation of timbrality in
a chord are seen as an abnormality? (Well if its to diverse its most likely.)
Because its to exact in tone compared to mechanical instruments?

What are *natural* sounding to a synth compared to whats defined as natural
sounding in a mechanical instrument in terms of polyphonic tonal disorder!?

Ideas folks?

Reg
KD


      
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From dalenkarl at yahoo.se  Thu Apr 19 15:45:16 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 19 Apr 2007 15:45:16 +0200 (CEST)
Subject: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or something)
In-Reply-To: <46265952.8000009@maza.fi>
Message-ID: <527234.75983.qm@web27601.mail.ukl.yahoo.com>

Some Pro one's are known to leak *audio* signals trough the VCA,
trim R138 and/or decrease r1122 in value.

KD

--- Matti Kari <maza at maza.fi> skrev:

> Hello,
> 
> my first post to the first & quick introduction first: I'm 25 years old 
> rocker from Helsinki, Finland. I've been doing some electronics DIY 
> before but mostly with tubes (practically some guitar / organ / electric 
> piano amps). I am also planning to build my own modular synth someday, 
> mostly with tubes on the signal path, etc.
> 
> Anyway, to the subject itself:
> 
> I have an SCI Pro-One which has the following problem: when the filter 
> cutoff CV is between some specific value (say: cutoff pot between 11 
> o'clock and 3 o'clock with no other CV's applied), signal from 
> oscillator 1 and / or noise source seems to be leaking so the filter CV 
> or something.
> 
> Please listen to this mp3: http://maza.fi/tmp/pro-one-noisyfilter.mp3
> The filter is swept using the EG on this example.
> 
> Does anyone have ideas what could cause this? Feeding the 3320 filter 
> straight from cutoff pot works fine and I've even swapped that chip, so 
> it can't be that one. Also I've replaced all the resistors and the quad 
> opamp that has the filter CV summing amp but the problem stays.
> 
> Any ideas?
> 
> Just a note: I've also replaced the PSU electrolytics to fresh ones and 
> those on signal path were changed to plastic ones to improve reliability.
> 
> Thanks in advance & best regards,
> 
> Matti
> 
> -- 
> Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
> maza at maza.fi || http://maza.fi/ || +358 40 838 6607
> hammondleslierhodestubeanalogsynthlinuxinternetetc.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



	
	
		
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From maza at maza.fi  Thu Apr 19 16:25:43 2007
From: maza at maza.fi (Matti Kari)
Date: Thu, 19 Apr 2007 17:25:43 +0300
Subject: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or something)
In-Reply-To: <527234.75983.qm@web27601.mail.ukl.yahoo.com>
References: <527234.75983.qm@web27601.mail.ukl.yahoo.com>
Message-ID: <46277BE7.5010804@maza.fi>

karl dalen wrote:
> Some Pro one's are known to leak *audio* signals trough the VCA,
> trim R138 and/or decrease r1122 in value.

Gotta try this, tackar :)

I just don't understand how the VCF CV setting could affect VCA leak?

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.


From johannes.oberg at gmail.com  Thu Apr 19 16:36:21 2007
From: johannes.oberg at gmail.com (=?ISO-8859-1?Q?Johannes_=D6berg?=)
Date: Thu, 19 Apr 2007 16:36:21 +0200
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
References: <46265D27.1070602@wayfar.net>
	<953612.5462.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <be546e560704190736v434e994er47e7b40294174bff@mail.gmail.com>

If I understand your question:

If one is to believe the "Linear Arithmetic" hype of the D-50, the
human brain is the most sensitive to the attack transient of a sound.
So what matters is probably that you get phase cancelations in the
attack. Always restarting the phase of the oscillators when a new note
is struck should cure the problem. I guess in a way you could say this
is what a piano does.

Another thing is probably accumulative envelopes. I personally think
it sounds nice, but most people seem to not like it.

/Johannes

On 4/19/07, karl dalen <dalenkarl at yahoo.se> wrote:
> With the old polys some users complains about that the next note plated
> dont sound like the previous played, it depends on the poly alg used
> off course,whether its voice repeat or step trough all voices at each note
> etc.Users of the Andromeda complaints about this particularely when
> FM a filter from a VCO or VCO to VCO.I also remember DX7 users had some
> minor issues about phase cancellation who could silence a particular note
> down a bit.
>
> Also people of single oscillator polys almost never complaints about
> polyphonic tonal dissorder compared to 2 or more oscillator per voice polys.
> Perhaps because that its easier to hear the disorder of 2 oscillators
> for then same voice compared to the one oscillator based chord? No?
>
> For example i never had read anywhere that synths based on CEM3394 would have
> more of the disorder between notes in a chord then of lets say a JP8 or a P5?
>
> But isn't this actually a normal situation to have certain amount of polyphonic
> tonal disorder!?
>
> Take a piano, a single note consist of several strings there are all kinds of
> phase cancellations going during the time of the decay of the note played,or
> take a guitarist playing a chord the higher notes dampens out more rapid then
> the lower played in a chord. No?
>
> Why is it so that just because its a synth the variation of timbrality in
> a chord are seen as an abnormality? (Well if its to diverse its most likely.)
> Because its to exact in tone compared to mechanical instruments?
>
> What are *natural* sounding to a synth compared to whats defined as natural
> sounding in a mechanical instrument in terms of polyphonic tonal disorder!?
>
> Ideas folks?
>
> Reg
> KD
>
>
>
> _________________________________________________________
> Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
> kalender. Dessutom 250 MB gratis, virusscanning och antispam. F? den p?: http://se.mail.yahoo.com
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From lenham at clara.co.uk  Thu Apr 19 17:09:09 2007
From: lenham at clara.co.uk (Steve Lenham)
Date: Thu, 19 Apr 2007 16:09:09 +0100
Subject: [sdiy] Polyphonic tonal disorder!
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <02db01c78294$ae7a4d90$0202a8c0@DELL>

From: "karl dalen":


>With the old polys some users complains about that the next note plated
>dont sound like the previous played, it depends on the poly alg used
>off course,whether its voice repeat or step trough all voices at each note
>etc.
>Also people of single oscillator polys almost never complaints about
>polyphonic tonal dissorder compared to 2 or more oscillator per voice 
>polys.
>Perhaps because that its easier to hear the disorder of 2 oscillators
>for then same voice compared to the one oscillator based chord? No?

I've just serviced an Oberheim OBX and this subject caused me a degree of 
head-scratching. At what point does "analogue character" step over the line 
and become a fault? I was hampered by the realisation that my own synth 
collection contains nothing but single-oscillator models, so I lacked 
hands-on experience!

There were two elements to it. First, there were minor timbral variations 
between voices even after they were all calibrated to the factory procedure. 
This would be more noticeable in some patches than others. I decided that 
this aspect (which affects single- as well as dual-oscillator synths) was 
unavoidable bearing in mind the nature of the OBX (early, largely discrete, 
with limited trimming facilities).

Then there is the matching between the oscillators on dual-osc machines. I 
think most people would want some slow phasing between the oscs on something 
like an OBX - none would be a bit sterile - but you want _the same amount_ 
on each voice. If the phasing rates are very different then this adds 
noticeably to the timbral variation. Generally one can do something about 
this, as tuning is trimmable. I did my best to match the eight voices, 
though I suspect that the road journey back to its owner will combine with 
the single-turn trimpots to reinject some additional "analogue character". 
Fortunately, that is what the owner says he appreciates in the OBX :-)

>But isn't this actually a normal situation to have certain amount of 
>polyphonic
>tonal disorder!?

IMHO it's just an aspect of what makes some people love analogue synths and 
other people want a better alternative, which is freely available in the 
form of...digital synths! At least nowadays one has the choice.

When playing chords, it just adds to the general swirl. It's when you play 
the same note repeatedly that it is most noticeable. The worst case is when 
the synth (as the OBX does)operates a strict 
step-sequentially-through-all-notes allocation policy, and this made me 
think that such a machine wouldn't be an ideal choice for a throbbing, 
mechanical bassline (for example). I had never considered that this might be 
a reason to choose a monosynth for those duties - alternatively, some polys 
offer a choice of voice allocation modes (e.g. the Roland Jupiter-4).

I for one continue to learn...

Steve L.



From lesmizz at bellsouth.net  Thu Apr 19 17:42:36 2007
From: lesmizz at bellsouth.net (Les Mizzell)
Date: Thu, 19 Apr 2007 11:42:36 -0400
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <02db01c78294$ae7a4d90$0202a8c0@DELL>
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
Message-ID: <46278DEC.6020103@bellsouth.net>


>> With the old polys some users complains about that the next note plated
>> dont sound like the previous played

1. One trumpet player can play the same note three times, and regardless 
of how hard he tries, there's no way to get all three exactly the same.

2. Three trumpet players and play the same three note chord three times, 
and it subject to the variations in #1 times 3.

In all six cases above, it all sounds damned good (if you like trumpets 
and the players are good!)

It's those little variations that make things sound "alive". Where the 
problem?


From jmahoney at gate.net  Thu Apr 19 18:14:20 2007
From: jmahoney at gate.net (John Mahoney)
Date: Thu, 19 Apr 2007 12:14:20 -0400
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <02db01c78294$ae7a4d90$0202a8c0@DELL>
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
Message-ID: <20070419161410.ZTSY27044.ibm64aec.bellsouth.net@VAIO.gate.net>

At 11:09 AM 4/19/2007, Steve Lenham wrote:

>I've just serviced an Oberheim OBX ..

On my OB-X it sounds like there is higher filter resonance on 2 
voices, but there isn't (AFAIK) any trimmer for adjusting that. I'd 
like to get all 4 voices sounding more alike (they will never sound 
the *same*, and that's a good thing). Any ideas?
--
john


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From casiorapman at hotmail.com  Thu Apr 19 18:38:55 2007
From: casiorapman at hotmail.com (Casio Rapman)
Date: Thu, 19 Apr 2007 09:38:55 -0700
Subject: [sdiy] Front Panel Polish?     `~~`
Message-ID: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>

I've got a couple synths with metal surfaces where the majority of the 
surface is shiny but there are a few dull spots as well as a few scratches.  
Some of these are on the front panels where there's lettering, some aren't.  
What do you guys recommend to restore things so they're nice and shiny / 
looking like new?   I notice a wipe with windex makes them look great.... 
til the Windex evaporates.  Is there some kind of really safe metal polish I 
could use that won't effect things long term and won't come off when you 
touch it?

Thanks!

_________________________________________________________________
The average US Credit Score is 675. The cost to see yours: $0 by Experian. 
http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE



From casiorapman at hotmail.com  Thu Apr 19 18:44:11 2007
From: casiorapman at hotmail.com (Casio Rapman)
Date: Thu, 19 Apr 2007 09:44:11 -0700
Subject: [sdiy] IC storage foam sheets?  ~``~
In-Reply-To: <46225AFE.3090901@tampabay.rr.com>
Message-ID: <BAY138-F39B891F318FBD0C3DF499BB9570@phx.gbl>

This is a good question.  I bought some a while ago.  I didn't and still 
don't remember the specifics, unfortunately, but when I bought more, the 
foam I got was kind of flimsy and seemed like it would deteriorate fast.  
Having gotten a bunch of old ICs from someone who used crappy foam that was 
crumbling by the time I got it, I think it's important for you to find foam 
that's pretty firm - not impossible to bend, but at least somewhat resistant 
to bending.  Please let us know what you end up getting and how it is, cause 
I need some more!

>From: Jay <synthbaron at tampabay.rr.com>
>To: Chris K <synth at wayfar.net>
>CC: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] IC storage foam sheets?
>Date: Sun, 15 Apr 2007 13:03:58 -0400
>
>Chris K wrote:
>
>>Does anyone know where to get that black foam for sorting / storing 
>>components? Hopefully something that will work with transistors / t0-220 
>>packages and dips ect.
>
>This is what I have been using:
>
>http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=13864&searchValue=foam
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Exercise your brain! Try Flexicon. 
http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07



From jays at aracnet.com  Thu Apr 19 19:12:05 2007
From: jays at aracnet.com (jays at aracnet.com)
Date: Thu, 19 Apr 2007 10:12:05 -0700
Subject: [sdiy] Front Panel Polish?     `~~`
Message-ID: <200704191712.l3JHC5P4011224@sapphire.spiritone.com>

On a couple of my own projects I've used car polish. That has shined things up and it protects the paint some. I also have gotten a number of old light fixtures from the recycling supply. Buffed them with very fine steel wool to get the corrosion and rust off and given them two, three coats of car wax and they have held up well.

I wouldn't get it on any plastic though.

Jay S.

Casio Rapman wrote:

> I've got a couple synths with metal surfaces where the majority of the 
> surface is shiny but there are a few dull spots as well as a few scratches.  
> Some of these are on the front panels where there's lettering, some aren't.  
> What do you guys recommend to restore things so they're nice and shiny / 
> looking like new?   I notice a wipe with windex makes them look great.... 
> til the Windex evaporates.  Is there some kind of really safe metal polish I 
> could use that won't effect things long term and won't come off when you 
> touch it?
> 
> Thanks!
> 
> _________________________________________________________________
> The average US Credit Score is 675. The cost to see yours: $0 by Experian. 
> http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From Stromeko at Compuserve.DE  Thu Apr 19 19:31:53 2007
From: Stromeko at Compuserve.DE (ASSI)
Date: Thu, 19 Apr 2007 19:31:53 +0200
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <46278DEC.6020103@bellsouth.net>
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
	<46278DEC.6020103@bellsouth.net>
Message-ID: <200704191931.53759.Stromeko@Compuserve.DE>

On Donnerstag, 19. April 2007 17:42, Les Mizzell wrote:
> It's those little variations that make things sound "alive". Where
> the problem?

The problem is when these variations have a discernible pattern and/or 
one voice sticks out.  You'd get all sort of wierd unwanted "accents" 
that only by chance would be in the right place.


So in your example if two of the trumpet players were masters of their 
instrument and one was a beginner and they decided to hand off each 
note in succession to the next player, you'd surely find the sound 
objectionable or at least strange even if you could live with the 
beginner playing the tune all by itself.


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+

SD adaptations for KORG EX-800 and Poly-800MkII V0.9:
http://Synth.Stromeko.net/Downloads.html#KorgSDada



From jean-pierre.desrochers at ville.quebec.qc.ca  Thu Apr 19 19:32:45 2007
From: jean-pierre.desrochers at ville.quebec.qc.ca (jean-pierre.desrochers at ville.quebec.qc.ca)
Date: Thu, 19 Apr 2007 13:32:45 -0400
Subject: [sdiy] Front Panel Polish?     `~~`
Message-ID: <536941FCDB4586449B3BCDF92FBEAA7B017DF0C2@srv3057000554.ville.quebec.qc.ca>


I've tried the spray car wax named ARMORALL.
It let a shinny finish on synths front panel that doesn't disappear with
time..
Be carefull.. not too much. Just one small spray at the time
and spread with a soft tissue.
J-P Desrochers

-----Message d'origine-----
De : Casio Rapman [mailto:casiorapman at hotmail.com]
Envoy? : 19 avril 2007 12:39
? : analogue at hyperreal.org
Cc : synth-diy at dropmix.xs4all.nl
Objet : [sdiy] Front Panel Polish? `~~`


I've got a couple synths with metal surfaces where the majority of the 
surface is shiny but there are a few dull spots as well as a few scratches.

Some of these are on the front panels where there's lettering, some aren't.

What do you guys recommend to restore things so they're nice and shiny / 
looking like new?   I notice a wipe with windex makes them look great.... 
til the Windex evaporates.  Is there some kind of really safe metal polish I

could use that won't effect things long term and won't come off when you 
touch it?

Thanks!



From harrybissell at copper.net  Thu Apr 19 19:39:13 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Thu, 19 Apr 2007 17:39:13 -0000
Subject: [sdiy] Front Panel Polish?     `~~`
Message-ID: <380-220074419173913536@copper.net>

If there is no lettering you can use 
a product called "wadding polish" 
which is a petroleum distillate soaked
into cotton batting (like car seats were
once stuffed with).

It works GREAT but it will take off
paint or lacquer. It will remove light
rust spots and leave a sparkling finish

H^) harry



>
>
>---- Original Message ----
>From: jays at aracnet.com
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Front Panel Polish?     `~~`
>Date: Thu, 19 Apr 2007 10:12:05 -0700
>
>>On a couple of my own projects I've used car polish. That has shined
>things up and it protects the paint some. I also have gotten a number
>of old light fixtures from the recycling supply. Buffed them with
>very fine steel wool to get the corrosion and rust off and given them
>two, three coats of car wax and they have held up well.
>>
>>I wouldn't get it on any plastic though.
>>
>>Jay S.
>>
>>Casio Rapman wrote:
>>
>>> I've got a couple synths with metal surfaces where the majority of
>the 
>>> surface is shiny but there are a few dull spots as well as a few
>scratches.  
>>> Some of these are on the front panels where there's lettering,
>some aren't.  
>>> What do you guys recommend to restore things so they're nice and
>shiny / 
>>> looking like new?   I notice a wipe with windex makes them look
>great.... 
>>> til the Windex evaporates.  Is there some kind of really safe
>metal polish I 
>>> could use that won't effect things long term and won't come off
>when you 
>>> touch it?
>>> 
>>> Thanks!
>>> 
>>> _________________________________________________________________
>>> The average US Credit Score is 675. The cost to see yours: $0 by
>Experian. 
>>>
>http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFO
>OTERAVERAGE
>>> 
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From daniel.araya at sr.se  Thu Apr 19 20:15:13 2007
From: daniel.araya at sr.se (Daniel Araya)
Date: Thu, 19 Apr 2007 20:15:13 +0200
Subject: [sdiy] Synthi-Mu
Message-ID: <s627cddd.001@rhcl03n02.sr.se>

The creator of synthDIY's Swedeish "sister-list" SAS built this great
looking machine:
http://home.swipnet.se/ericg/synthi.htm

Nice!

/d


From jluciani at gmail.com  Thu Apr 19 20:22:24 2007
From: jluciani at gmail.com (John Luciani)
Date: Thu, 19 Apr 2007 14:22:24 -0400
Subject: [sdiy] Front Panel Polish? `~~`
In-Reply-To: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>
References: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>
Message-ID: <608bfe540704191122l756963a8ua9b63b839555b0f2@mail.gmail.com>

On 4/19/07, Casio Rapman <casiorapman at hotmail.com> wrote:
> I've got a couple synths with metal surfaces where the majority of the
> surface is shiny but there are a few dull spots as well as a few scratches.
> Some of these are on the front panels where there's lettering, some aren't.
> What do you guys recommend to restore things so they're nice and shiny /
> looking like new?   I notice a wipe with windex makes them look great....
> til the Windex evaporates.  Is there some kind of really safe metal polish I
> could use that won't effect things long term and won't come off when you
> touch it?

I use Butcher's Bowling Alley Wax on all the metal, wood and laminate
surfaces of my woodworking tools.

http://www.bwccompany.com/bowlingalley.html

(* jcl *)

-- 
http://www.luciani.org


From tim.parkhurst at gmail.com  Thu Apr 19 20:29:17 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Thu, 19 Apr 2007 11:29:17 -0700
Subject: [sdiy] Re: [AH] Front Panel Polish? `~~`
In-Reply-To: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>
References: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>
Message-ID: <87441170704191129p7dd92eb1r1ef2aa6fc916dda0@mail.gmail.com>

On 4/19/07, Casio Rapman <casiorapman at hotmail.com> wrote:
> I've got a couple synths with metal surfaces where the majority of the
> surface is shiny but there are a few dull spots as well as a few scratches.
> Some of these are on the front panels where there's lettering, some aren't.
> What do you guys recommend to restore things so they're nice and shiny /
> looking like new?   I notice a wipe with windex makes them look great....
> til the Windex evaporates.  Is there some kind of really safe metal polish I
> could use that won't effect things long term and won't come off when you
> touch it?
>
> Thanks!
>

To polish up these dull spots without affecting the finish underneath,
what you want is a very mild abrasive. As weird as it sounds, you
might try toothpaste. It's very similar to polishing compound, but is
even less abrasive. I've also heard of it being used to polish and
clean scratches on plastic, but in either case, I would try it on a
hidden area first. If this works, you can tell people you have a Mint
synth.


Tim (whiter, but not brighter) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From maza at maza.fi  Thu Apr 19 20:52:19 2007
From: maza at maza.fi (Matti Kari)
Date: Thu, 19 Apr 2007 21:52:19 +0300
Subject: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or something)
In-Reply-To: <527234.75983.qm@web27601.mail.ukl.yahoo.com>
References: <527234.75983.qm@web27601.mail.ukl.yahoo.com>
Message-ID: <4627BA63.1090403@maza.fi>

Hola

karl dalen wrote:
> Some Pro one's are known to leak *audio* signals trough the VCA,
> trim R138 and/or decrease r1122 in value.

Yeah, it definetely is a VCA problem! Now that I started to twiddle with 
the synth more, I just understood that somehow when any of the CV's is 
on some specific value, the VCA leaks. And after a while I noticed that 
at certain volume setting, the problem is practically unnoticeable - I 
just have to compensate that on my mixer.

However, adjusting VCA balance and that resistor you mentioned didn't 
help that much.

More ideas?

Ps. I already owe you sauna and beer if you happen to visit Helsinki. ;)

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.


From dalenkarl at yahoo.se  Thu Apr 19 21:11:39 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 19 Apr 2007 21:11:39 +0200 (CEST)
Subject: SV: Re: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or
	something)
In-Reply-To: <4627BA63.1090403@maza.fi>
Message-ID: <921818.13862.qm@web27608.mail.ukl.yahoo.com>

The pro one has a blasting gain , reffered as very hot output.
Which means that if you lower the gain (adjusting r1122) the 
magnitude of errors would decrease (i.e offsets and leakages etc).

Instead of having the Volume knob at 9 o' clock  and blasting gain
you get blasting gain at 4 o' clock.

if you look at the schematics you will see that the volume knob
are actually a voltage divider to the current converter of the VCA
which is not a regular volume knob.

The problem are most notified when full resonance are set at the VCF,
it has a constant tone in the background depending on cutoff even if
Volume are at zero. You could try to increase r1142 to 30K.

Wait a minute now!!

Have you checked the potential at u115 pin 14, it should not be to 
much positive.

KD

Yes i have the beer please! But i skip the sauna! :-)



ofte
--- Matti Kari <maza at maza.fi> skrev:

> Hola
> 
> karl dalen wrote:
> > Some Pro one's are known to leak *audio* signals trough the VCA,
> > trim R138 and/or decrease r1122 in value.
> 
> Yeah, it definetely is a VCA problem! Now that I started to twiddle with 
> the synth more, I just understood that somehow when any of the CV's is 
> on some specific value, the VCA leaks. And after a while I noticed that 
> at certain volume setting, the problem is practically unnoticeable - I 
> just have to compensate that on my mixer.
> 
> However, adjusting VCA balance and that resistor you mentioned didn't 
> help that much.
> 
> More ideas?
> 
> Ps. I already owe you sauna and beer if you happen to visit Helsinki. ;)
> 
> -- 
> Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
> maza at maza.fi || http://maza.fi/ || +358 40 838 6607
> hammondleslierhodestubeanalogsynthlinuxinternetetc.
> 



      
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From maza at maza.fi  Thu Apr 19 22:03:27 2007
From: maza at maza.fi (Matti Kari)
Date: Thu, 19 Apr 2007 23:03:27 +0300
Subject: SV: Re: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or
	something)
In-Reply-To: <921818.13862.qm@web27608.mail.ukl.yahoo.com>
References: <921818.13862.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <4627CB0F.5070509@maza.fi>

Problem solved!

I changed the VCA decoupling capacitor and the problem went from "very 
bad" to "unnoticeable". At the same time I also did the "ground loop 
removal" modification, so that may have had some effect as well.

Thanks for the hints - they really were the key to solve the problem anyway!

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.


From dalenkarl at yahoo.se  Thu Apr 19 23:42:17 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 19 Apr 2007 23:42:17 +0200 (CEST)
Subject: SV: Re: SV: Re: SV: [sdiy] SCI Pro-One problem (audio leaks to CV or
	something)
In-Reply-To: <4627CB0F.5070509@maza.fi>
Message-ID: <404494.2820.qm@web27612.mail.ukl.yahoo.com>

The supply bypass cap to Ca3280 VCA?

KD

--- Matti Kari <maza at maza.fi> skrev:

> Problem solved!
> 
> I changed the VCA decoupling capacitor and the problem went from "very 
> bad" to "unnoticeable". At the same time I also did the "ground loop 
> removal" modification, so that may have had some effect as well.
> 
> Thanks for the hints - they really were the key to solve the problem anyway!
> 
> -- 
> Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
> maza at maza.fi || http://maza.fi/ || +358 40 838 6607
> hammondleslierhodestubeanalogsynthlinuxinternetetc.
> 



      
_________________________________________________________
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From cfmd at bredband.net  Thu Apr 19 23:59:47 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Thu, 19 Apr 2007 23:59:47 +0200 (CEST)
Subject: [sdiy] Synthi-Mu
In-Reply-To: <s627cddd.001@rhcl03n02.sr.se>
References: <s627cddd.001@rhcl03n02.sr.se>
Message-ID: <20070419.235947.-1967589236.cfmd@bredband.net>

From: "Daniel Araya" <daniel.araya at sr.se>
Subject: [sdiy] Synthi-Mu
Date: Thu, 19 Apr 2007 20:15:13 +0200
Message-ID: <s627cddd.001 at rhcl03n02.sr.se>

Daniel,

> The creator of synthDIY's Swedeish "sister-list" SAS

You should know better, it's AHs and Synth-DIYs sexy Swedish sister! :)
(OK, that's a 10 year old joke, but anyway... :)

> built this great looking machine:
> http://home.swipnet.se/ericg/synthi.htm
> 
> Nice!

Indeed.

Cheers,
Magnus


From billbigrig at yahoo.com  Fri Apr 20 00:50:50 2007
From: billbigrig at yahoo.com (bill bigrig)
Date: Thu, 19 Apr 2007 15:50:50 -0700 (PDT)
Subject: [sdiy] front panel polish
Message-ID: <850041.56769.qm@web32710.mail.mud.yahoo.com>

Howdy,

 i would try hand applying with a cloth, some
armor-all protectant.
rig

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
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From edwardcking2001 at yahoo.co.uk  Fri Apr 20 02:13:12 2007
From: edwardcking2001 at yahoo.co.uk (Edward King)
Date: Fri, 20 Apr 2007 03:13:12 +0300
Subject: [sdiy] Front Panel Polish?     `~~`
References: <BAY138-F31AB414C21B5717ED43D6EB9570@phx.gbl>
Message-ID: <00c701c782e0$b1617d70$4b20fea9@eklt1>

If it were me and the panel was all metal, I would go for powder coating.

Cheap as chips, very shiny finish, very tough and professional looking.

EK


----- Original Message ----- 
From: "Casio Rapman" <casiorapman at hotmail.com>
To: <analogue at hyperreal.org>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Thursday, April 19, 2007 7:38 PM
Subject: [sdiy] Front Panel Polish? `~~`


> I've got a couple synths with metal surfaces where the majority of the 
> surface is shiny but there are a few dull spots as well as a few 
> scratches.  Some of these are on the front panels where there's lettering, 
> some aren't.  What do you guys recommend to restore things so they're nice 
> and shiny / looking like new?   I notice a wipe with windex makes them 
> look great.... til the Windex evaporates.  Is there some kind of really 
> safe metal polish I could use that won't effect things long term and won't 
> come off when you touch it?
>
> Thanks!
>
> _________________________________________________________________
> The average US Credit Score is 675. The cost to see yours: $0 by Experian. 
> http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From casiorapman at hotmail.com  Fri Apr 20 06:45:08 2007
From: casiorapman at hotmail.com (Casio Rapman)
Date: Thu, 19 Apr 2007 21:45:08 -0700
Subject: [sdiy] front panel polish
In-Reply-To: <850041.56769.qm@web32710.mail.mud.yahoo.com>
Message-ID: <BAY138-F129FDD067E53082956CA1CB9560@phx.gbl>

There appear to be a number of Armor All Protectants.  Any particular 
recommendations?
Also, I believe the label says not to use on paint, so I'm going to assume 
it's not good for front panels?


>From: bill bigrig <billbigrig at yahoo.com>
>To: synth-diy <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] front panel polish
>Date: Thu, 19 Apr 2007 15:50:50 -0700 (PDT)
>
>Howdy,
>
>  i would try hand applying with a cloth, some
>armor-all protectant.
>rig
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam?  Yahoo! Mail has the best spam protection around
>http://mail.yahoo.com
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
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From maza at maza.fi  Fri Apr 20 08:10:25 2007
From: maza at maza.fi (Matti Kari)
Date: Fri, 20 Apr 2007 09:10:25 +0300
Subject: SV: Re: SV: Re: SV: [sdiy] SCI Pro-One problem (audio leaks to
	CV or something)
In-Reply-To: <404494.2820.qm@web27612.mail.ukl.yahoo.com>
References: <404494.2820.qm@web27612.mail.ukl.yahoo.com>
Message-ID: <46285951.2020800@maza.fi>

karl dalen wrote:
> The supply bypass cap to Ca3280 VCA?

Yep.

The problem in the beginning was so bad that practically even at almost 
full volume it was noticeable when I had both oscillators on full 
volume. Now the volume is at half and I can't notice any side noises 
(however, they still are there if I turn both osc's to zero and volume 
to full, but who cares, this sounds pretty damn good now!)

-- 
Matti Kari   ||   Vesalantie 38a, FI-00940 Helsinki
maza at maza.fi || http://maza.fi/ || +358 40 838 6607
hammondleslierhodestubeanalogsynthlinuxinternetetc.


From anpitkam at hotmail.com  Fri Apr 20 08:21:28 2007
From: anpitkam at hotmail.com (Antti Pitkämäki)
Date: Fri, 20 Apr 2007 09:21:28 +0300
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <BAY109-F220AEDA119A81467D89707CA560@phx.gbl>

Hi,

>What are *natural* sounding to a synth compared to whats defined as natural
>sounding in a mechanical instrument in terms of polyphonic tonal disorder!?

My analog polysynths are a Korg Polysix and an Akai VX600, and I've never 
noticed this "tonal disorder" to be any problem. OK, the Polysix has only a 
single VCO for each voice, and the Akai has a pretty good autocalibration 
feature. However, the Akai sucks at VCO-crossmod-sounds, they are completely 
out of tune but they are so even in mono mode :(

Somebody recommended that if the phase of oscillators was restarted with 
each note on an analog polysynth, it would minimize this "tonal disorder" - 
I personally think that there might be some sounds where it might be useful, 
but in most cases I think the way analog polysynths behave is just great, 
and also unique to them.

Antti P.

_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE! 
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From lenham at clara.co.uk  Fri Apr 20 09:44:16 2007
From: lenham at clara.co.uk (Steve Lenham)
Date: Fri, 20 Apr 2007 08:44:16 +0100
Subject: [sdiy] Polyphonic tonal disorder!
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
	<20070419161410.ZTSY27044.ibm64aec.bellsouth.net@VAIO.gate.net>
Message-ID: <030101c7831f$b2cea360$0202a8c0@DELL>

From: "John Mahoney" <jmahoney at gate.net>

>>I've just serviced an Oberheim OBX ..
>
> On my OB-X it sounds like there is higher filter resonance on 2 voices, 
> but there isn't (AFAIK) any trimmer for adjusting that. I'd like to get 
> all 4 voices sounding more alike (they will never sound the *same*, and 
> that's a good thing). Any ideas?

You're right - the only trimming on the OBX filter is scale and offset for 
the cutoff frequency.

I didn't try to change the filter timbre on the machine that I worked on, 
but would speculate that the variations in resonance might be down to 
differences between the CA3080s used in each voice's filter, in particular 
A14 which provides voltage control of resonance.

Many of the 3080s in 'my' unit were marked with a red dot, implying that 
Oberheim carried out some matching/selection at the time of manufacture, but 
maybe the matching wasn't all that tight or perhaps 30 years of drift has 
magnified their differences.

You could try matching some 3080s for...what? transconductance?...and 
fitting them to the voice cards as a set. Or just fit socket(s) to the 
offending voice cards and keep trying 3080s till you find one that sounds 
right...

Do report back if you try this - it would be good to know. It might not even 
be the 3080s, so we could rule them out.

Good luck!

Steve L.




From jhaible at debitel.net  Fri Apr 20 10:52:29 2007
From: jhaible at debitel.net (JH.)
Date: Fri, 20 Apr 2007 10:52:29 +0200
Subject: [sdiy] Polyphonic tonal disorder!
References: <BAY109-F220AEDA119A81467D89707CA560@phx.gbl>
Message-ID: <001301c78329$4b2badc0$0200a8c0@jhsilent>

Something like slightly different beat rates between VCO pairs, from voice 
to voice, are quite important for the "analogue-ness" of a polyphonic synth 
sound.
I'm convinced that the pattern generated by the usual voice assign 
alogrithms is picked up and recognizen by the unconcious, at least (and you 
can recognize it if you're closely listening for that effect).
On full-polyphonic synth like the Korg PS series, the situation is more like 
on acoustic and electromechanical instruments, where each key has a slightly 
individual sound - a very pleasant effect as well.
The more I think about the subject, the more I am convinced that subtle 
_patterns_ play as much as a part when a synth sound is recognized as 
"analogue", as random effects.

JH. 



From loscha at gmail.com  Fri Apr 20 12:53:24 2007
From: loscha at gmail.com (Loscha)
Date: Fri, 20 Apr 2007 20:53:24 +1000
Subject: [sdiy] Driving Relays from an LFO
Message-ID: <17035a3d0704200353ma33aeccqce439eb99b9f9c06@mail.gmail.com>

For reference; I'm writing this email because I have some of this
technology http://www.loscha.com/forsale/relay.jpg (it was on ebay,  I
was the seller, and I have more, which I wish to use for
"stuff")......

Ok, so, I've got an LFO, say, a 555 based something or other, or a
CGS58 or similar (http://www.cgs.synth.net/modules/cgs58_lfo.html) and
I want to make the square waveform drive some relays.
 I obviously don't want to just start plugging relay coils into my
circuits willy nilly cause I don't want to cook them. I know the 555
is a player, and can handle the juice, but, If I had a Moog, or a
roland system X00, I'd be pretty foolish to just plug relays in.

Example application

audio in goes into relay;
signal switches between 2 different guitar pedals
signals mixed in together through to audio out

I know that doing this sort of routing is not best done with relays,
that complimentary pairs of 4066s would be better -- use less current,
not have a millisecond delay time and so on, but, I have a bunch of
these boards with relays & banana plugs in them, and I'm trying to
find a use for them.

thanks for any suggestions, ladies and gents.

best wishes;
Edward r Jones


From edwardcking2001 at yahoo.co.uk  Fri Apr 20 13:26:23 2007
From: edwardcking2001 at yahoo.co.uk (Edward King)
Date: Fri, 20 Apr 2007 14:26:23 +0300
Subject: [sdiy] Front Panel Polish? `~~`
References: <BAY138-F99D183113D9B8E6F0DC7DB9560@phx.gbl>
Message-ID: <01a901c7833f$25c16c80$4b20fea9@eklt1>


I'll look out the link for the powder coating system I saw recently. On the 
rare occasion that I need to get anything like this done, I use a colleague 
who has a messy workshop and ovens and stuff.
But theres a DIY powder coating system that I know others have used, is very 
cheap and produces excellent results.

EK


----- Original Message ----- 
From: "Casio Rapman" <casiorapman at hotmail.com>
To: <edwardcking2001 at yahoo.co.uk>
Cc: <analogue at hyperreal.org>
Sent: Friday, April 20, 2007 7:46 AM
Subject: Re: [sdiy] Front Panel Polish? `~~`


> Thanks for the tip.  Have you got any specific brand you'd recommend?  And 
> would this be ok for front panels with lettering?
>
>
>>From: "Edward King" <edwardcking2001 at yahoo.co.uk>
>>To: "Casio Rapman" <casiorapman at hotmail.com>,<analogue at hyperreal.org>
>>CC: <synth-diy at dropmix.xs4all.nl>
>>Subject: Re: [sdiy] Front Panel Polish?     `~~`
>>Date: Fri, 20 Apr 2007 03:13:12 +0300
>>
>>If it were me and the panel was all metal, I would go for powder coating.
>>
>>Cheap as chips, very shiny finish, very tough and professional looking.
>>
>>EK
>>
>>
>>----- Original Message ----- From: "Casio Rapman" 
>><casiorapman at hotmail.com>
>>To: <analogue at hyperreal.org>
>>Cc: <synth-diy at dropmix.xs4all.nl>
>>Sent: Thursday, April 19, 2007 7:38 PM
>>Subject: [sdiy] Front Panel Polish? `~~`
>>
>>
>>>I've got a couple synths with metal surfaces where the majority of the 
>>>surface is shiny but there are a few dull spots as well as a few 
>>>scratches.  Some of these are on the front panels where there's 
>>>lettering, some aren't.  What do you guys recommend to restore things so 
>>>they're nice and shiny / looking like new?   I notice a wipe with windex 
>>>makes them look great.... til the Windex evaporates.  Is there some kind 
>>>of really safe metal polish I could use that won't effect things long 
>>>term and won't come off when you touch it?
>>>
>>>Thanks!
>>>
>>>_________________________________________________________________
>>>The average US Credit Score is 675. The cost to see yours: $0 by 
>>>Experian. 
>>>http://www.freecreditreport.com/pm/default.aspx?sc=660600&bcd=EMAILFOOTERAVERAGE
>>>
>>>_______________________________________________
>>>Synth-diy mailing list
>>>Synth-diy at dropmix.xs4all.nl
>>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
> _________________________________________________________________
> MSN is giving away a trip to Vegas to see Elton John. Enter to win today. 
> http://msnconcertcontest.com?icid-nceltontagline
> 



From flightofharmony at comcast.net  Fri Apr 20 15:29:36 2007
From: flightofharmony at comcast.net (flightofharmony at comcast.net)
Date: Fri, 20 Apr 2007 06:29:36 -0700
Subject: [sdiy] IC storage foam sheets?  ~``~
In-Reply-To: <BAY138-F39B891F318FBD0C3DF499BB9570@phx.gbl>
References: <BAY138-F39B891F318FBD0C3DF499BB9570@phx.gbl>
Message-ID: <4628C040.6040706@comcast.net>

I get mine from RADAR electronics,
http://www.radarinc.com
They are made by Desco and come in a couple different styles. The ones I 
get are 24"x36"x1/4" high-density foam for $19.00 each.  This foam is 
the best I have found for IC storage.

flight

Casio Rapman wrote:
> This is a good question.  I bought some a while ago.  I didn't and 
> still don't remember the specifics, unfortunately, but when I bought 
> more, the foam I got was kind of flimsy and seemed like it would 
> deteriorate fast.  Having gotten a bunch of old ICs from someone who 
> used crappy foam that was crumbling by the time I got it, I think it's 
> important for you to find foam that's pretty firm - not impossible to 
> bend, but at least somewhat resistant to bending.  Please let us know 
> what you end up getting and how it is, cause I need some more!
>
>> From: Jay <synthbaron at tampabay.rr.com>
>> To: Chris K <synth at wayfar.net>
>> CC: synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] IC storage foam sheets?
>> Date: Sun, 15 Apr 2007 13:03:58 -0400
>>
>> Chris K wrote:
>>
>>> Does anyone know where to get that black foam for sorting / storing 
>>> components? Hopefully something that will work with transistors / 
>>> t0-220 packages and dips ect.
>>
>> This is what I have been using:
>>
>> http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=13864&searchValue=foam 
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _________________________________________________________________
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> http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07 
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>
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> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From tim.parkhurst at gmail.com  Fri Apr 20 17:43:21 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Fri, 20 Apr 2007 08:43:21 -0700
Subject: [sdiy] front panel polish
In-Reply-To: <BAY138-F129FDD067E53082956CA1CB9560@phx.gbl>
References: <850041.56769.qm@web32710.mail.mud.yahoo.com>
	<BAY138-F129FDD067E53082956CA1CB9560@phx.gbl>
Message-ID: <87441170704200843m7f6d291bn5bfa2f71d0cf0009@mail.gmail.com>

On 4/19/07, Casio Rapman <casiorapman at hotmail.com> wrote:
> There appear to be a number of Armor All Protectants.  Any particular
> recommendations?
> Also, I believe the label says not to use on paint, so I'm going to assume
> it's not good for front panels?
>
>

First off - pardon the cross posting.

Nothing against Bill or any other members, but I would avoid Armor All
stuff like the plague. The problem with Armor All is that it initially
leaves a very nice shine, but when it dries out it leaves several
nasty chemicals behind. If you talk to guys who restore cars (note:
guys who REALLY make a living restoring expensive vintage cars, not
the tuner post-tween down the street who thinks an SUV on chrome 24s
is da bomb), they'll use polishing compound and wax on metal and
painted metal, and silicone spray for rubber and plastic. Armor All
isn't really made for hard surfaces, and although it makes plastic and
rubber look nice at first (although artifically shiny IMHO), it
eventually dries them out and leaves them in worse shape than when you
started. I don't know about Armor All waxes and what not, but again,
hardcore car nuts will use other stuff (Meguiars, Mothers).


Tim (wwwaaaaaaaayyyy post-tween) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From goldenechos at hotmail.com  Fri Apr 20 19:21:25 2007
From: goldenechos at hotmail.com (Anthony Rolando)
Date: Fri, 20 Apr 2007 13:21:25 -0400
Subject: [sdiy] Driving Relays from an LFO
In-Reply-To: <17035a3d0704200353ma33aeccqce439eb99b9f9c06@mail.gmail.com>
Message-ID: <BAY140-F18138F68D3B12C555F2CEBB6560@phx.gbl>

Well, you are def. right on about the 4066 being a better way to go...

Those boxes look very cool though!
Any idea what type of signal they are EXPECTING?

You could build a buffer and experiment, that should provide adequate 
protection for your X0X or whatever...

You could probably put together a 4066 based switching system just as 
quickly, and then drop it into the cool looking box, using all the plugs and 
what not.

TR



>From: Loscha <loscha at gmail.com>
>To: "synthesizer diy electronics" <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] Driving Relays from an LFO
>Date: Fri, 20 Apr 2007 20:53:24 +1000
>
>For reference; I'm writing this email because I have some of this
>technology http://www.loscha.com/forsale/relay.jpg (it was on ebay,  I
>was the seller, and I have more, which I wish to use for
>"stuff")......
>
>Ok, so, I've got an LFO, say, a 555 based something or other, or a
>CGS58 or similar (http://www.cgs.synth.net/modules/cgs58_lfo.html) and
>I want to make the square waveform drive some relays.
>I obviously don't want to just start plugging relay coils into my
>circuits willy nilly cause I don't want to cook them. I know the 555
>is a player, and can handle the juice, but, If I had a Moog, or a
>roland system X00, I'd be pretty foolish to just plug relays in.
>
>Example application
>
>audio in goes into relay;
>signal switches between 2 different guitar pedals
>signals mixed in together through to audio out
>
>I know that doing this sort of routing is not best done with relays,
>that complimentary pairs of 4066s would be better -- use less current,
>not have a millisecond delay time and so on, but, I have a bunch of
>these boards with relays & banana plugs in them, and I'm trying to
>find a use for them.
>
>thanks for any suggestions, ladies and gents.
>
>best wishes;
>Edward r Jones
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
Need a break? Find your escape route with Live Search Maps. 
http://maps.live.com/?icid=hmtag3



From sdiy at oveloe.com  Fri Apr 20 19:38:33 2007
From: sdiy at oveloe.com (Charles Bisaillon)
Date: Fri, 20 Apr 2007 13:38:33 -0400
Subject: [sdiy] Retarded function generator - Agilent 33220A
In-Reply-To: <87441170704200843m7f6d291bn5bfa2f71d0cf0009@mail.gmail.com>
Message-ID: <C24E72D9.A2EF%sdiy@oveloe.com>

Hi, I would love to get your opinion on this one,

I remember having unexpected low level problems when we were presenting the
capstone modular project. Well, I recently learned from a classmate that the
function generator I used to design the whole synth actually outputs twice
the voltage selected. I remember setting it daily to 10Vpp and using it
instead of my 10Vpp VCO. I went back to check verify this and he was right,
set at 10Vpp, I get 20Vpp at the output. How can someone design such a
stoopid thing?

Anyways, this means that all of my module's inputs, unity gain, clip
circuitry, headroom, etc, are designed to receive twice the voltage that
they will operate on. On the other hand, all my outputs are designed
properly and yield proper levels (provided you get a proper input, which in
this case is 20Vpp). It's such a pain, even my 1V/oct is actually designed
for 2V/oct...

I now have a choice to make: Raise the VCO outputs to 20Vpp instead of 10Vpp
and the ADSR to 10V instead of 5V, or go back to the breadboard and redesign
the VCF and VCA? I would love to get your opinions on this.

Thanks

Charles (I hate electronics)



From jays at aracnet.com  Fri Apr 20 20:08:43 2007
From: jays at aracnet.com (jays at aracnet.com)
Date: Fri, 20 Apr 2007 11:08:43 -0700
Subject: [sdiy] Retarded function generator - Agilent 33220A
Message-ID: <200704201808.l3KI8hNw032205@sapphire.spiritone.com>

Charles,

I'm pretty familar with the 33220A. On a daily basis I have a hate relationship with one on my desk. If I were looking for a signal generator I would avoid this one. Granted some of my problems with the unit are with the GPIB/PI implementation which most people here wouldn't use.
1) Soft knob crapped out a month out of warrenty. Costs about 1K to fix.
2) The only reliable way I can control it externally is with the GPIB interface. The network and USB interfaces are marginal.
3) Some important features can not be controlled over the GPIB/PI interface and have to manually be tweaked.
4) Some of the waveforms aren't as good as they should be.

There probably is a very simple explination why this happens. Check the termination of the 33220A which is at Utility | Output Setup | Load. Switching between 50 ohm and hi-z termination screws with the output level. Having it set to 50 ohms with 10V output and driving a hi-z input will probaly give you about 20V out. That or just changing the termination can change the output voltage. This is not a unique feature for this signal generator. There are a number of other ones that do this also.

Jay S.


Charles Bisaillon wrote:

> Hi, I would love to get your opinion on this one,
> 
> I remember having unexpected low level problems when we were presenting the
> capstone modular project. Well, I recently learned from a classmate that the
> function generator I used to design the whole synth actually outputs twice
> the voltage selected. I remember setting it daily to 10Vpp and using it
> instead of my 10Vpp VCO. I went back to check verify this and he was right,
> set at 10Vpp, I get 20Vpp at the output. How can someone design such a
> stoopid thing?
> 
> Anyways, this means that all of my module's inputs, unity gain, clip
> circuitry, headroom, etc, are designed to receive twice the voltage that
> they will operate on. On the other hand, all my outputs are designed
> properly and yield proper levels (provided you get a proper input, which in
> this case is 20Vpp). It's such a pain, even my 1V/oct is actually designed
> for 2V/oct...
> 
> I now have a choice to make: Raise the VCO outputs to 20Vpp instead of 10Vpp
> and the ADSR to 10V instead of 5V, or go back to the breadboard and redesign
> the VCF and VCA? I would love to get your opinions on this.
> 
> Thanks
> 
> Charles (I hate electronics)
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From jason at redfish.net  Fri Apr 20 20:39:04 2007
From: jason at redfish.net (Jason Proctor)
Date: Fri, 20 Apr 2007 11:39:04 -0700
Subject: [sdiy] i put up some FPDs
Message-ID: <a06200792c24eb897fe67@[10.0.1.203]>

finally got round to putting some FPDs up. to follow - pics of built 
modules and screengrabs from FPE to accompany.

enjoy

http://www.clockdivision.com/fpd.html



From tim.parkhurst at gmail.com  Fri Apr 20 21:06:04 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Fri, 20 Apr 2007 12:06:04 -0700
Subject: [sdiy] i put up some FPDs
In-Reply-To: <a06200792c24eb897fe67@10.0.1.203>
References: <a06200792c24eb897fe67@10.0.1.203>
Message-ID: <87441170704201206x49667158x917c9f2477a81c5c@mail.gmail.com>

On 4/20/07, Jason Proctor <jason at redfish.net> wrote:
> finally got round to putting some FPDs up. to follow - pics of built
> modules and screengrabs from FPE to accompany.
>
> enjoy
>
> http://www.clockdivision.com/fpd.html
>
> _______________________________________________

Two questions: what's an FPD, and why don't any of the links on your
FPD page work?


Tim (perfectly willing to accept the fact that I may be doing
something stupid) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From nicksdsu at mac.com  Fri Apr 20 21:11:01 2007
From: nicksdsu at mac.com (Nicholas Gregorich)
Date: Fri, 20 Apr 2007 12:11:01 -0700
Subject: [sdiy] Retarded function generator - Agilent 33220A
In-Reply-To: <200704201808.l3KI8hNw032205@sapphire.spiritone.com>
References: <200704201808.l3KI8hNw032205@sapphire.spiritone.com>
Message-ID: <588D46E5-1E69-48ED-9017-3BD1D9143EFB@mac.com>

I never had the Vpp problem that the original poster has [I almost  
always use the HiZ output mode] but all of the 33220As at school have  
the broken softknob problem! You have to spin the knob backwards to  
move up in value. Its terrible!

Nick.

On Apr 20, 2007, at 11:08 AM, jays at aracnet.com wrote:

> Charles,
>
> I'm pretty familar with the 33220A. On a daily basis I have a hate  
> relationship with one on my desk. If I were looking for a signal  
> generator I would avoid this one. Granted some of my problems with  
> the unit are with the GPIB/PI implementation which most people here  
> wouldn't use.
> 1) Soft knob crapped out a month out of warrenty. Costs about 1K to  
> fix.
> 2) The only reliable way I can control it externally is with the  
> GPIB interface. The network and USB interfaces are marginal.
> 3) Some important features can not be controlled over the GPIB/PI  
> interface and have to manually be tweaked.
> 4) Some of the waveforms aren't as good as they should be.
>
> There probably is a very simple explination why this happens. Check  
> the termination of the 33220A which is at Utility | Output Setup |  
> Load. Switching between 50 ohm and hi-z termination screws with the  
> output level. Having it set to 50 ohms with 10V output and driving  
> a hi-z input will probaly give you about 20V out. That or just  
> changing the termination can change the output voltage. This is not  
> a unique feature for this signal generator. There are a number of  
> other ones that do this also.
>
> Jay S.
>
>
> Charles Bisaillon wrote:
>
>> Hi, I would love to get your opinion on this one,
>>
>> I remember having unexpected low level problems when we were  
>> presenting the
>> capstone modular project. Well, I recently learned from a  
>> classmate that the
>> function generator I used to design the whole synth actually  
>> outputs twice
>> the voltage selected. I remember setting it daily to 10Vpp and  
>> using it
>> instead of my 10Vpp VCO. I went back to check verify this and he  
>> was right,
>> set at 10Vpp, I get 20Vpp at the output. How can someone design  
>> such a
>> stoopid thing?
>>
>> Anyways, this means that all of my module's inputs, unity gain, clip
>> circuitry, headroom, etc, are designed to receive twice the  
>> voltage that
>> they will operate on. On the other hand, all my outputs are designed
>> properly and yield proper levels (provided you get a proper input,  
>> which in
>> this case is 20Vpp). It's such a pain, even my 1V/oct is actually  
>> designed
>> for 2V/oct...
>>
>> I now have a choice to make: Raise the VCO outputs to 20Vpp  
>> instead of 10Vpp
>> and the ADSR to 10V instead of 5V, or go back to the breadboard  
>> and redesign
>> the VCF and VCA? I would love to get your opinions on this.
>>
>> Thanks
>>
>> Charles (I hate electronics)
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From jason at redfish.net  Fri Apr 20 21:16:52 2007
From: jason at redfish.net (Jason Proctor)
Date: Fri, 20 Apr 2007 12:16:52 -0700
Subject: [sdiy] i put up some FPDs
In-Reply-To: <87441170704201206x49667158x917c9f2477a81c5c@mail.gmail.com>
References: <a06200792c24eb897fe67@10.0.1.203>
	<87441170704201206x49667158x917c9f2477a81c5c@mail.gmail.com>
Message-ID: <a06200793c24ec1dc2a9c@[10.0.1.203]>

nope, as usual, it was me doing something stupid.

FPDs are front panel designer files.

http://www.frontpanelexpress.com




>
>Two questions: what's an FPD, and why don't any of the links on your
>FPD page work?
>
>
>Tim (perfectly willing to accept the fact that I may be doing
>something stupid) Servo
>--
>"Imagination is more important than knowledge." - Albert Einstein



From altitude at optrand.com  Fri Apr 20 21:45:45 2007
From: altitude at optrand.com (Altitude)
Date: Fri, 20 Apr 2007 15:45:45 -0400
Subject: [sdiy] i put up some FPDs
In-Reply-To: <87441170704201206x49667158x917c9f2477a81c5c@mail.gmail.com>
Message-ID: <200704201945.l3KJjow9031803@dropmix.xs4all.nl>

I believe those would be Front Panel Express Templates which require front
panel express

-r 


__________________________________________
"Setting the RESONANCE to high level might prove interesting" - Roland
SH-101 Manual

www.no-ho.com
www.teknatural.com

 
 
-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Tim Parkhurst
Sent: Friday, April 20, 2007 3:06 PM
To: Jason Proctor
Cc: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] i put up some FPDs

On 4/20/07, Jason Proctor <jason at redfish.net> wrote:
> finally got round to putting some FPDs up. to follow - pics of built 
> modules and screengrabs from FPE to accompany.
>
> enjoy
>
> http://www.clockdivision.com/fpd.html
>
> _______________________________________________

Two questions: what's an FPD, and why don't any of the links on your FPD
page work?


Tim (perfectly willing to accept the fact that I may be doing something
stupid) Servo
--
"Imagination is more important than knowledge." - Albert Einstein
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From abis at rogers.com  Fri Apr 20 22:40:31 2007
From: abis at rogers.com (Andrew Beeton)
Date: Fri, 20 Apr 2007 16:40:31 -0400
Subject: [sdiy] i put up some FPDs
In-Reply-To: <a06200793c24ec1dc2a9c@[10.0.1.203]>
References: <a06200792c24eb897fe67@10.0.1.203>
	<87441170704201206x49667158x917c9f2477a81c5c@mail.gmail.com>
	<a06200793c24ec1dc2a9c@[10.0.1.203]>
Message-ID: <c8fab201d99f1effc4fd470a4329ca4b@rogers.com>

My two questions: is the a Mac application that can read these files? 
And, is there a similar Mac application to design display panels?

Cheers,

Andrew

On Apr 20, 2007, at 3:16 PM, Jason Proctor wrote:

> nope, as usual, it was me doing something stupid.
>
> FPDs are front panel designer files.
>
> http://www.frontpanelexpress.com
>
>
>
>
>>
>> Two questions: what's an FPD, and why don't any of the links on your
>> FPD page work?
>>
>>
>> Tim (perfectly willing to accept the fact that I may be doing
>> something stupid) Servo
>> --
>> "Imagination is more important than knowledge." - Albert Einstein
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From cfmd at bredband.net  Sat Apr 21 00:38:29 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Sat, 21 Apr 2007 00:38:29 +0200 (CEST)
Subject: [sdiy] Interesting EDN article on capacitors
In-Reply-To: <380-22007421720543558@copper.net>
References: <380-22007421720543558@copper.net>
Message-ID: <20070421.003829.554228892.cfmd@bredband.net>

From: harrybissell at copper.net
Subject: [sdiy] Interesting EDN article on capacitors
Date: Tue, 17 Apr 2007 20:54:03 -0000
Message-ID: <380-22007421720543558 at copper.net>

> April 12, 2007
> Kymberly Schmidt - Maxim Integrated Products
> 
> "Choose capacitor types to optimize PC sound quality"
> 
> It shows the distortions caused by progressively poorer
> dielectrice...  with X7R being the best (of the bad)
> The film capacitor blows the doors off all the ceramics.
> Higher voltage is better, bigger physical size is better...
> any surprises here ?   :^P

Nah...

My problem is that I want good dielectrics (film cap preferably), not too small
in capacitance, surfacemount, relatively small and that survives industry
mounting and soldering for ROHS compliant soldering temperatures.

While that is not for audio in itself, it is for low-freq signals and I do
care.

Oh, the other day we had a bad case of microphony in ceramic caps, luckilly
someone was paying attention and tapping the cap directly made it jump like
hell. "Digital"? BAH!

Cheers,
Magnus


From loscha at gmail.com  Sat Apr 21 02:55:18 2007
From: loscha at gmail.com (Loscha)
Date: Sat, 21 Apr 2007 10:55:18 +1000
Subject: [sdiy] Driving Relays from an LFO
In-Reply-To: <BAY140-F18138F68D3B12C555F2CEBB6560@phx.gbl>
References: <17035a3d0704200353ma33aeccqce439eb99b9f9c06@mail.gmail.com>
	<BAY140-F18138F68D3B12C555F2CEBB6560@phx.gbl>
Message-ID: <17035a3d0704201755h33b1dc5bj1bb0ef2dbc2e6b8c@mail.gmail.com>

they are Motor Control trainers, for industrial process design.

I have ship load more photos. http://www.loscha.com/forsale/all_boards.zip

-Edward

On 4/21/07, Anthony Rolando <goldenechos at hotmail.com> wrote:
> Well, you are def. right on about the 4066 being a better way to go...
>
> Those boxes look very cool though!
> Any idea what type of signal they are EXPECTING?
>
> You could build a buffer and experiment, that should provide adequate
> protection for your X0X or whatever...
>
> You could probably put together a 4066 based switching system just as
> quickly, and then drop it into the cool looking box, using all the plugs and
> what not.
>
> TR
>
>
>
> >From: Loscha <loscha at gmail.com>
> >To: "synthesizer diy electronics" <synth-diy at dropmix.xs4all.nl>
> >Subject: [sdiy] Driving Relays from an LFO
> >Date: Fri, 20 Apr 2007 20:53:24 +1000
> >
> >For reference; I'm writing this email because I have some of this
> >technology http://www.loscha.com/forsale/relay.jpg (it was on ebay,  I
> >was the seller, and I have more, which I wish to use for
> >"stuff")......
> >
> >Ok, so, I've got an LFO, say, a 555 based something or other, or a
> >CGS58 or similar (http://www.cgs.synth.net/modules/cgs58_lfo.html) and
> >I want to make the square waveform drive some relays.
> >I obviously don't want to just start plugging relay coils into my
> >circuits willy nilly cause I don't want to cook them. I know the 555
> >is a player, and can handle the juice, but, If I had a Moog, or a
> >roland system X00, I'd be pretty foolish to just plug relays in.
> >
> >Example application
> >
> >audio in goes into relay;
> >signal switches between 2 different guitar pedals
> >signals mixed in together through to audio out
> >
> >I know that doing this sort of routing is not best done with relays,
> >that complimentary pairs of 4066s would be better -- use less current,
> >not have a millisecond delay time and so on, but, I have a bunch of
> >these boards with relays & banana plugs in them, and I'm trying to
> >find a use for them.
> >
> >thanks for any suggestions, ladies and gents.
> >
> >best wishes;
> >Edward r Jones
> >_______________________________________________
> >Synth-diy mailing list
> >Synth-diy at dropmix.xs4all.nl
> >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> _________________________________________________________________
> Need a break? Find your escape route with Live Search Maps.
> http://maps.live.com/?icid=hmtag3
>
>


-- 
www.loscha.com


From rob at emulatorarchive.com  Sat Apr 21 15:04:41 2007
From: rob at emulatorarchive.com (rob)
Date: Sat, 21 Apr 2007 14:04:41 +0100
Subject: [sdiy] Analog Metropolis Filter PCB's
In-Reply-To: <17035a3d0704201755h33b1dc5bj1bb0ef2dbc2e6b8c@mail.gmail.com>
Message-ID: <000001c78415$a37b87b0$0302a8c0@LENOVO>

Hi,
I have 2 brand new PCB's left over from customer orders, and I am
selling then cheap. 

AM4023: A replica of the ARP 4023 2 pole VCF
The AM4023 PCB is for sale at 15 UK pounds, including postage.
More details are here, including project notes:
http://www.emulatorarchive.com/Modules/ARP/AM4023/am4023.html


AM2140: A replica of the E-mu Systems Modular 2-pole Resonant Filter
The AM2140 PCB and NOS SSM2020 chip is for sale at 30 UK Pounds,
including postage. More details are here, including project notes:
http://www.emulatorarchive.com/Modules/E-mu_Systems/AM2140/am2140.html

These are both nice sounding filters for use in modern modular
synthesizers.

Email me off list for more details.
Many thanks
Rob
www.emulatorarchive.com





From dalenkarl at yahoo.se  Sun Apr 22 21:45:13 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Sun, 22 Apr 2007 21:45:13 +0200 (CEST)
Subject: [sdiy] bla, bla, bla ,bla.....testing 123!
In-Reply-To: <a06200793c24ec1dc2a9c@[10.0.1.203]>
Message-ID: <195821.8401.qm@web27609.mail.ukl.yahoo.com>

bla, bla, bla ,bla.....testing 123!

KD


      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From ijfritz at comcast.net  Mon Apr 23 02:50:00 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Sun, 22 Apr 2007 18:50:00 -0600
Subject: [sdiy] More chaos up
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>

Hello --

I have put up information on another chaos system.  Some of this was posted 
temporarily a couple of years ago, but this time it will stay up.  If there 
is interest I may do a board for this circuit.

   Ian

http://home.comcast.net/~ijfritz/ch_cir2.htm 



From dalenkarl at yahoo.se  Mon Apr 23 17:12:17 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 23 Apr 2007 17:12:17 +0200 (CEST)
Subject: SV: Re: [sdiy] bla, bla, bla ,bla.....testing 123!
In-Reply-To: <a6fac3a00704221336q5f025d08s965c56909afbd7e6@mail.gmail.com>
Message-ID: <215841.16804.qm@web27608.mail.ukl.yahoo.com>

Yes, the list appears to be stone dead!
Time to run the backuplist again i suppose!

Your next message didnt appear!

KD

--- megaohm <megaohm1 at gmail.com> skrev:

> I read you. Karl. Are you having trouble posting to SDIY? I am, too. See my
> next messege (hopefully) .
> 
> p.
> 
> On 4/22/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >
> > bla, bla, bla ,bla.....testing 123!
> >
> > KD
> >
> >
> >       L?t v?rk?nslorna spira.
> > Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From nicksdsu at mac.com  Mon Apr 23 19:00:06 2007
From: nicksdsu at mac.com (Nicholas Gregorich)
Date: Mon, 23 Apr 2007 10:00:06 -0700
Subject: SV: Re: [sdiy] bla, bla, bla ,bla.....testing 123!
In-Reply-To: <215841.16804.qm@web27608.mail.ukl.yahoo.com>
References: <215841.16804.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <AA70E02D-52C4-45D7-9AEF-9783AAE7A1AE@mac.com>

Hmm, I see all of KD's messages but none of peng's on the list.

Nick.


On Apr 23, 2007, at 8:12 AM, karl dalen wrote:

> Yes, the list appears to be stone dead!
> Time to run the backuplist again i suppose!
>
> Your next message didnt appear!
>
> KD
>
> --- megaohm <megaohm1 at gmail.com> skrev:
>
>> I read you. Karl. Are you having trouble posting to SDIY? I am,  
>> too. See my
>> next messege (hopefully) .
>>
>> p.
>>
>> On 4/22/07, karl dalen <dalenkarl at yahoo.se> wrote:
>>>
>>> bla, bla, bla ,bla.....testing 123!
>>>
>>> KD
>>>
>>>
>>>       L?t v?rk?nslorna spira.
>>> Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>
>
>
>
>       __________________________________________________________
> Hitta din n?sta resa p? Yahoo! Shopping.
> J?mf?r pris p? flygbiljetter och hotellrum h?r: http:// 
> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




From elektrodwarf at yahoo.se  Mon Apr 23 20:00:27 2007
From: elektrodwarf at yahoo.se (Karl Ekdahl)
Date: Mon, 23 Apr 2007 20:00:27 +0200 (CEST)
Subject: SV: Re: SV: Re: [sdiy] bla, bla, bla ,bla.....testing 123!
In-Reply-To: <AA70E02D-52C4-45D7-9AEF-9783AAE7A1AE@mac.com>
Message-ID: <20070423180028.71448.qmail@web26208.mail.ukl.yahoo.com>

Same for me

--- Nicholas Gregorich <nicksdsu at mac.com> skrev:

> Hmm, I see all of KD's messages but none of peng's
> on the list.
> 
> Nick.
> 
> 
> On Apr 23, 2007, at 8:12 AM, karl dalen wrote:
> 
> > Yes, the list appears to be stone dead!
> > Time to run the backuplist again i suppose!
> >
> > Your next message didnt appear!
> >
> > KD
> >
> > --- megaohm <megaohm1 at gmail.com> skrev:
> >
> >> I read you. Karl. Are you having trouble posting
> to SDIY? I am,  
> >> too. See my
> >> next messege (hopefully) .
> >>
> >> p.
> >>
> >> On 4/22/07, karl dalen <dalenkarl at yahoo.se>
> wrote:
> >>>
> >>> bla, bla, bla ,bla.....testing 123!
> >>>
> >>> KD
> >>>
> >>>
> >>>       L?t v?rk?nslorna spira.
> >>> Hitta din tvillingsj?l p? Yahoo! Dejting:
> http://se.meetic.yahoo.net
> >>> _______________________________________________
> >>> Synth-diy mailing list
> >>> Synth-diy at dropmix.xs4all.nl
> >>>
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>
> >
> >
> >
> >      
>
__________________________________________________________
> > Hitta din n?sta resa p? Yahoo! Shopping.
> > J?mf?r pris p? flygbiljetter och hotellrum h?r:
> http:// 
> >
> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> >
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From grichter at asapnet.net  Mon Apr 23 20:33:38 2007
From: grichter at asapnet.net (Grant Richter)
Date: Mon, 23 Apr 2007 13:33:38 -0500
Subject: [sdiy] Civility on the List
In-Reply-To: <215841.16804.qm@web27608.mail.ukl.yahoo.com>
References: <215841.16804.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>

This list was populated with the most highly respected specialized  
experts on the PLANET. Many of the rest are people with degrees or  
advanced degrees.
University degrees are good place to start, if you then add to that  
years of personally funded original research.

Flat out contradicting known and respected experts is silly and makes  
the contradicting poster look stupid. I sadly watched the  
exasperation level of the real experts raise over the years. I know  
who the expert posters are, because I do background checks and read  
their web pages before responding.

The "because I said so" attitude is completely unacceptable in a peer  
review setting. If you are not willing to justify inflated  
performance claims with published factual data, then don't post them.  
You just look foolish by doing so.

I respectfully suggest that posters consider the emotional impact of  
their posts, and develop their diplomatic skills in general. If we  
can not maintain the civility I would expect from a person to person  
professional conference, then this list has lost the ability to  
advance the state of the art in synthesis.

In Closing: Cloning existing designs part by part is not an  
advancement in the state of the art of synthesis. Only applying  
original thinking to existing ideas can produce new avenues of  
research. For this, I heartily salute Prof. Lanterman who is teaching  
this methodology to his students.

On Apr 23, 2007, at 10:12 AM, karl dalen wrote:

> Yes, the list appears to be stone dead!
> Time to run the backuplist again i suppose!
>
> Your next message didnt appear!
>
> KD
>
> --- megaohm <megaohm1 at gmail.com> skrev:
>
>> I read you. Karl. Are you having trouble posting to SDIY? I am,  
>> too. See my
>> next messege (hopefully) .
>>
>> p.
>>
>> On 4/22/07, karl dalen <dalenkarl at yahoo.se> wrote:
>>>
>>> bla, bla, bla ,bla.....testing 123!
>>>
>>> KD
>>>
>>>
>>>       L?t v?rk?nslorna spira.
>>> Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>
>
>
>
>       __________________________________________________________
> Hitta din n?sta resa p? Yahoo! Shopping.
> J?mf?r pris p? flygbiljetter och hotellrum h?r: http:// 
> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




From elektrodwarf at yahoo.se  Mon Apr 23 21:05:38 2007
From: elektrodwarf at yahoo.se (Karl Ekdahl)
Date: Mon, 23 Apr 2007 21:05:38 +0200 (CEST)
Subject: SV: [sdiy] Civility on the List
In-Reply-To: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
Message-ID: <163961.75670.qm@web26213.mail.ukl.yahoo.com>

Pardon me but is there still some conversations going
on, is the list working? I got this e-mail but i have
no idea about the context since i've more or less
received nothing from the list in a while...

Karl

--- Grant Richter <grichter at asapnet.net> skrev:

> This list was populated with the most highly
> respected specialized  
> experts on the PLANET. Many of the rest are people
> with degrees or  
> advanced degrees.
> University degrees are good place to start, if you
> then add to that  
> years of personally funded original research.
> 
> Flat out contradicting known and respected experts
> is silly and makes  
> the contradicting poster look stupid. I sadly
> watched the  
> exasperation level of the real experts raise over
> the years. I know  
> who the expert posters are, because I do background
> checks and read  
> their web pages before responding.
> 
> The "because I said so" attitude is completely
> unacceptable in a peer  
> review setting. If you are not willing to justify
> inflated  
> performance claims with published factual data, then
> don't post them.  
> You just look foolish by doing so.
> 
> I respectfully suggest that posters consider the
> emotional impact of  
> their posts, and develop their diplomatic skills in
> general. If we  
> can not maintain the civility I would expect from a
> person to person  
> professional conference, then this list has lost the
> ability to  
> advance the state of the art in synthesis.
> 
> In Closing: Cloning existing designs part by part is
> not an  
> advancement in the state of the art of synthesis.
> Only applying  
> original thinking to existing ideas can produce new
> avenues of  
> research. For this, I heartily salute Prof.
> Lanterman who is teaching  
> this methodology to his students.
> 
> On Apr 23, 2007, at 10:12 AM, karl dalen wrote:
> 
> > Yes, the list appears to be stone dead!
> > Time to run the backuplist again i suppose!
> >
> > Your next message didnt appear!
> >
> > KD
> >
> > --- megaohm <megaohm1 at gmail.com> skrev:
> >
> >> I read you. Karl. Are you having trouble posting
> to SDIY? I am,  
> >> too. See my
> >> next messege (hopefully) .
> >>
> >> p.
> >>
> >> On 4/22/07, karl dalen <dalenkarl at yahoo.se>
> wrote:
> >>>
> >>> bla, bla, bla ,bla.....testing 123!
> >>>
> >>> KD
> >>>
> >>>
> >>>       L?t v?rk?nslorna spira.
> >>> Hitta din tvillingsj?l p? Yahoo! Dejting:
> http://se.meetic.yahoo.net
> >>> _______________________________________________
> >>> Synth-diy mailing list
> >>> Synth-diy at dropmix.xs4all.nl
> >>>
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>
> >
> >
> >
> >      
>
__________________________________________________________
> > Hitta din n?sta resa p? Yahoo! Shopping.
> > J?mf?r pris p? flygbiljetter och hotellrum h?r:
> http:// 
> >
> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> >
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From grichter at asapnet.net  Mon Apr 23 21:10:32 2007
From: grichter at asapnet.net (Grant Richter)
Date: Mon, 23 Apr 2007 14:10:32 -0500
Subject: SV: [sdiy] Civility on the List
In-Reply-To: <163961.75670.qm@web26213.mail.ukl.yahoo.com>
References: <163961.75670.qm@web26213.mail.ukl.yahoo.com>
Message-ID: <32B1DB1F-E1A6-40C9-966B-4ED7D532E17F@asapnet.net>

I was suggesting the incessant squabbling was part of the list demise.

On Apr 23, 2007, at 2:05 PM, Karl Ekdahl wrote:

> Pardon me but is there still some conversations going
> on, is the list working? I got this e-mail but i have
> no idea about the context since i've more or less
> received nothing from the list in a while...
>
> Karl
>
> --- Grant Richter <grichter at asapnet.net> skrev:
>
>> This list was populated with the most highly
>> respected specialized
>> experts on the PLANET. Many of the rest are people
>> with degrees or
>> advanced degrees.
>> University degrees are good place to start, if you
>> then add to that
>> years of personally funded original research.
>>
>> Flat out contradicting known and respected experts
>> is silly and makes
>> the contradicting poster look stupid. I sadly
>> watched the
>> exasperation level of the real experts raise over
>> the years. I know
>> who the expert posters are, because I do background
>> checks and read
>> their web pages before responding.
>>
>> The "because I said so" attitude is completely
>> unacceptable in a peer
>> review setting. If you are not willing to justify
>> inflated
>> performance claims with published factual data, then
>> don't post them.
>> You just look foolish by doing so.
>>
>> I respectfully suggest that posters consider the
>> emotional impact of
>> their posts, and develop their diplomatic skills in
>> general. If we
>> can not maintain the civility I would expect from a
>> person to person
>> professional conference, then this list has lost the
>> ability to
>> advance the state of the art in synthesis.
>>
>> In Closing: Cloning existing designs part by part is
>> not an
>> advancement in the state of the art of synthesis.
>> Only applying
>> original thinking to existing ideas can produce new
>> avenues of
>> research. For this, I heartily salute Prof.
>> Lanterman who is teaching
>> this methodology to his students.
>>
>> On Apr 23, 2007, at 10:12 AM, karl dalen wrote:
>>
>>> Yes, the list appears to be stone dead!
>>> Time to run the backuplist again i suppose!
>>>
>>> Your next message didnt appear!
>>>
>>> KD
>>>
>>> --- megaohm <megaohm1 at gmail.com> skrev:
>>>
>>>> I read you. Karl. Are you having trouble posting
>> to SDIY? I am,
>>>> too. See my
>>>> next messege (hopefully) .
>>>>
>>>> p.
>>>>
>>>> On 4/22/07, karl dalen <dalenkarl at yahoo.se>
>> wrote:
>>>>>
>>>>> bla, bla, bla ,bla.....testing 123!
>>>>>
>>>>> KD
>>>>>
>>>>>
>>>>>       L?t v?rk?nslorna spira.
>>>>> Hitta din tvillingsj?l p? Yahoo! Dejting:
>> http://se.meetic.yahoo.net
>>>>> _______________________________________________
>>>>> Synth-diy mailing list
>>>>> Synth-diy at dropmix.xs4all.nl
>>>>>
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>>>
>>>>
>>>
>>>
>>>
>>>
>>
> __________________________________________________________
>>> Hitta din n?sta resa p? Yahoo! Shopping.
>>> J?mf?r pris p? flygbiljetter och hotellrum h?r:
>> http://
>>>
>> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>>
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
>
>
>       __________________________________________________________
> Hitta din n?sta resa p? Yahoo! Shopping.
> J?mf?r pris p? flygbiljetter och hotellrum h?r: http:// 
> shopping.yahoo.se/b/a/c_169901_resor_biljetter.html




From jayv at synth.net  Mon Apr 23 21:29:31 2007
From: jayv at synth.net (Jay Vaughan)
Date: Mon, 23 Apr 2007 21:29:31 +0200
Subject: [sdiy] Civility on the List
In-Reply-To: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
References: <215841.16804.qm@web27608.mail.ukl.yahoo.com>
	<432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
Message-ID: <a06230907c252b970ce71@[10.145.8.92]>

At 13:33 -0500 23/4/07, Grant Richter wrote:
>Flat out contradicting known and respected experts is silly and
>makes the contradicting poster look stupid. I sadly watched the
>exasperation level of the real experts raise over the years. I know
>who the expert posters are, because I do background checks and read
>their web pages before responding.

True.  But on the other hand, renowned experts who do nothing but 
deflate the inspired newbies are a tire, a bore, and a curse on any 
list ..

-- 

;

Jay Vaughan



From harrybissell at copper.net  Mon Apr 23 22:08:09 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Mon, 23 Apr 2007 20:08:09 -0000
Subject: [sdiy] Civility on the List
Message-ID: <380-220074123208925@copper.net>

hmmm... if they "deflate the inspired newbies" on the
list then the experts are uncivil as well...

otoh I consider it a service to newbies to point them 
away from "paths-to-nowhere-that-have-been-trod-before"

Often when an idea seems to not be in common usage its because
of a "hidden weenie" that makes it unworkable or impractical.

I had to cut up a guitar to discover the problem of shorting
frets through the strings.  Maybe I can save someone time
by them not repeating a failed experiment(or known problem).

I wonder as well if I have missed some posts... I did not
see anyone who was particularly uncivil (at least lately) imho...

H^) harry



>
>
>
>---- Original Message ----
>From: jayv at synth.net
>To: grichter at asapnet.net, dalenkarl at yahoo.se,
>synth-diy at dropmix.xs4all.nl, megaohm1 at gmail.com
>Subject: Re: [sdiy] Civility on the List
>Date: Mon, 23 Apr 2007 21:29:31 +0200
>
>>At 13:33 -0500 23/4/07, Grant Richter wrote:
>>>Flat out contradicting known and respected experts is silly and
>>>makes the contradicting poster look stupid. I sadly watched the
>>>exasperation level of the real experts raise over the years. I know
>>>who the expert posters are, because I do background checks and read
>>>their web pages before responding.
>>
>>True.  But on the other hand, renowned experts who do nothing but 
>>deflate the inspired newbies are a tire, a bore, and a curse on any 
>>list ..
>>
>>-- 
>>
>>;
>>
>>Jay Vaughan
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From ijfritz at comcast.net  Mon Apr 23 22:24:56 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Mon, 23 Apr 2007 14:24:56 -0600
Subject: [sdiy] Civility on the List
In-Reply-To: <380-220074123208925@copper.net>
References: <380-220074123208925@copper.net>
Message-ID: <6.2.1.2.2.20070423142038.020f3e20@mail.comcast.net>

At 02:08 PM 4/23/2007, harrybissell at copper.net wrote:

>I wonder as well if I have missed some posts... I did not
>see anyone who was particularly uncivil (at least lately) imho...

Same here. Can anybody tell us what is going on?  It's pretty frustrating 
to post new work and get no response. Is anyone in touch with Rick about this?

   Ian 



From harrybissell at copper.net  Mon Apr 23 22:34:46 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Mon, 23 Apr 2007 20:34:46 -0000
Subject: [sdiy] Polyphonic tonal disorder!
Message-ID: <380-220074123203446645@copper.net>

My bet would be that the 3080 were selected for
low input offset voltage. This varies with Gm
bias so it cannot be trimmed out easily

H^) harry


>
>
>
>---- Original Message ----
>From: lenham at clara.co.uk
>To: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] Polyphonic tonal disorder!
>Date: Fri, 20 Apr 2007 08:44:16 +0100
>
>>From: "John Mahoney" <jmahoney at gate.net>
>>
>>>>I've just serviced an Oberheim OBX ..
>>>
>>> On my OB-X it sounds like there is higher filter resonance on 2
>voices, 
>>> but there isn't (AFAIK) any trimmer for adjusting that. I'd like
>to get 
>>> all 4 voices sounding more alike (they will never sound the
>*same*, and 
>>> that's a good thing). Any ideas?
>>
>>You're right - the only trimming on the OBX filter is scale and
>offset for 
>>the cutoff frequency.
>>
>>I didn't try to change the filter timbre on the machine that I
>worked on, 
>>but would speculate that the variations in resonance might be down
>to 
>>differences between the CA3080s used in each voice's filter, in
>particular 
>>A14 which provides voltage control of resonance.
>>
>>Many of the 3080s in 'my' unit were marked with a red dot, implying
>that 
>>Oberheim carried out some matching/selection at the time of
>manufacture, but 
>>maybe the matching wasn't all that tight or perhaps 30 years of
>drift has 
>>magnified their differences.
>>
>>You could try matching some 3080s for...what?
>transconductance?...and 
>>fitting them to the voice cards as a set. Or just fit socket(s) to
>the 
>>offending voice cards and keep trying 3080s till you find one that
>sounds 
>>right...
>>
>>Do report back if you try this - it would be good to know. It might
>not even 
>>be the 3080s, so we could rule them out.
>>
>>Good luck!
>>
>>Steve L.
>>
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From daniel.araya at sr.se  Mon Apr 23 22:46:42 2007
From: daniel.araya at sr.se (Daniel Araya)
Date: Mon, 23 Apr 2007 22:46:42 +0200
Subject: Sv: Re: [sdiy] Civility on the List
Message-ID: <s62d3777.091@rhcl03n02.sr.se>

I'm getting this message but I have no clue to whats going on!

/Daniel

>>> Ian Fritz <ijfritz at comcast.net> 07-04-23 22:24 >>>
At 02:08 PM 4/23/2007, harrybissell at copper.net wrote:

>I wonder as well if I have missed some posts... I did not
>see anyone who was particularly uncivil (at least lately) imho...

Same here. Can anybody tell us what is going on?  It's pretty
frustrating 
to post new work and get no response. Is anyone in touch with Rick about
this?

   Ian 

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From dalenkarl at yahoo.se  Mon Apr 23 23:34:48 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 23 Apr 2007 23:34:48 +0200 (CEST)
Subject: SV: Re: [sdiy] Civility on the List
In-Reply-To: <6.2.1.2.2.20070423142038.020f3e20@mail.comcast.net>
Message-ID: <946061.49699.qm@web27611.mail.ukl.yahoo.com>

Right!

What the h..l is going on really??
I haven't got any of the list demise postings!! :-)

I have got about 5 postings from the past 10 days!!

KD

--- Ian Fritz <ijfritz at comcast.net> skrev:

> At 02:08 PM 4/23/2007, harrybissell at copper.net wrote:
> 
> >I wonder as well if I have missed some posts... I did not
> >see anyone who was particularly uncivil (at least lately) imho...
> 
> Same here. Can anybody tell us what is going on?  It's pretty frustrating 
> to post new work and get no response. Is anyone in touch with Rick about
> this?
> 
>    Ian 
> 
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From dalenkarl at yahoo.se  Mon Apr 23 23:46:11 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 23 Apr 2007 23:46:11 +0200 (CEST)
Subject: [sdiy] SV: Civility on the List
In-Reply-To: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
Message-ID: <839730.13893.qm@web27609.mail.ukl.yahoo.com>

Hahaha!
I must say that Grants posting are the most 
mysterious posting i have read in years! :-).....

(because i very occasionally gets any posts from sdiy list,
ie knowing zero in what it relates to).

KD

--- Grant Richter <grichter at asapnet.net> skrev:

> This list was populated with the most highly respected specialized  
> experts on the PLANET. Many of the rest are people with degrees or  
> advanced degrees.
> University degrees are good place to start, if you then add to that  
> years of personally funded original research.
> 
> Flat out contradicting known and respected experts is silly and makes  
> the contradicting poster look stupid. I sadly watched the  
> exasperation level of the real experts raise over the years. I know  
> who the expert posters are, because I do background checks and read  
> their web pages before responding.
> 
> The "because I said so" attitude is completely unacceptable in a peer  
> review setting. If you are not willing to justify inflated  
> performance claims with published factual data, then don't post them.  
> You just look foolish by doing so.
> 
> I respectfully suggest that posters consider the emotional impact of  
> their posts, and develop their diplomatic skills in general. If we  
> can not maintain the civility I would expect from a person to person  
> professional conference, then this list has lost the ability to  
> advance the state of the art in synthesis.
> 
> In Closing: Cloning existing designs part by part is not an  
> advancement in the state of the art of synthesis. Only applying  
> original thinking to existing ideas can produce new avenues of  
> research. For this, I heartily salute Prof. Lanterman who is teaching  
> this methodology to his students.
> 
> On Apr 23, 2007, at 10:12 AM, karl dalen wrote:
> 
> > Yes, the list appears to be stone dead!
> > Time to run the backuplist again i suppose!
> >
> > Your next message didnt appear!
> >
> > KD
> >
> > --- megaohm <megaohm1 at gmail.com> skrev:
> >
> >> I read you. Karl. Are you having trouble posting to SDIY? I am,  
> >> too. See my
> >> next messege (hopefully) .
> >>
> >> p.
> >>
> >> On 4/22/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >>>
> >>> bla, bla, bla ,bla.....testing 123!
> >>>
> >>> KD
> >>>
> >>>
> >>>       L?t v?rk?nslorna spira.
> >>> Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net
> >>> _______________________________________________
> >>> Synth-diy mailing list
> >>> Synth-diy at dropmix.xs4all.nl
> >>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >>>
> >>
> >
> >
> >
> >       __________________________________________________________
> > Hitta din n?sta resa p? Yahoo! Shopping.
> > J?mf?r pris p? flygbiljetter och hotellrum h?r: http:// 
> > shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 



      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From dalenkarl at yahoo.se  Mon Apr 23 23:57:29 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Mon, 23 Apr 2007 23:57:29 +0200 (CEST)
Subject: [sdiy] List dump?
In-Reply-To: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
Message-ID: <941790.88736.qm@web27606.mail.ukl.yahoo.com>

Are there any ways to get hold on the last 200 postings from this list?
if you know reply to me not to list since i cant read the list at the moment!

Thanks in advance!

KD


      _________________________________________________________
Flyger tiden iv?g? F?nga dagen med Yahoo! Mails inbyggda
kalender. Dessutom obegr?nsat lagringutrymme, virusscanning
och antispam. F? den p?: http://se.mail.yahoo.com


From Barry.L.Klein at wdc.com  Tue Apr 24 01:12:03 2007
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Mon, 23 Apr 2007 16:12:03 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <839730.13893.qm@web27609.mail.ukl.yahoo.com>
References: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
	<839730.13893.qm@web27609.mail.ukl.yahoo.com>
Message-ID: <6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>

Did anyone on the list go to the Make Faire in San Mateo last year?  Another
one is coming up next month.  Looks to be quite interesting but they don't
give a schedule so I do not know if all goes on at the fairgrounds or some
offsite - and how late it goes to.  I'd be flying up for either one day or
both.

Barry




From tim.parkhurst at gmail.com  Tue Apr 24 02:32:46 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Mon, 23 Apr 2007 17:32:46 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>
References: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
	<839730.13893.qm@web27609.mail.ukl.yahoo.com>
	<6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>
Message-ID: <87441170704231732w7b04fadhd34ad4feb7124d01@mail.gmail.com>

On 4/23/07, Barry Klein <Barry.L.Klein at wdc.com> wrote:
> Did anyone on the list go to the Make Faire in San Mateo last year?  Another
> one is coming up next month.  Looks to be quite interesting but they don't
> give a schedule so I do not know if all goes on at the fairgrounds or some
> offsite - and how late it goes to.  I'd be flying up for either one day or
> both.
>
> Barry
>

Hey Barry,

Although I didn't make last year's event, it looks fairly interesting.
Also, you can buy tickets on line and save yourself a few bucks...
https://store.makezine.com/SearchResults.asp?Cat=35

There's also a "video preview" on the Make main page
http://makezine.com/

I'd also be interested in hearing any reviews. San Mateo isn't a long
drive for me, but I don't want to waste the day and twenty or thirty
bucks on tickets (for me and the spousal unit) if it's a snooze fest.


Tim (snoo fest... go ahead, ask me "what's snoo?") Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From pfperry at melbpc.org.au  Tue Apr 24 03:39:44 2007
From: pfperry at melbpc.org.au (Paul Perry)
Date: Tue, 24 Apr 2007 11:39:44 +1000
Subject: [sdiy] SV: Civility on the List
References: <839730.13893.qm@web27609.mail.ukl.yahoo.com>
Message-ID: <005f01c78611$6f912e20$5401a8c0@frostwave>

I don't think there is a problem with the list,
there simply aren't all that many people posting regularly 
& sometimes, everyone is building stuff (or getting on with
life, maybe even making music!) & so, no posts.

Certainly, this is a much less abusive & troll-ridden list than 
almost any other I know, so if it DID collapse, that would not 
be the cause!

"busy people = quiet list"

paul perry Melbourne Australia


From tonelismulas at gmail.com  Tue Apr 24 03:45:11 2007
From: tonelismulas at gmail.com (Tonelismulas V)
Date: Mon, 23 Apr 2007 22:45:11 -0300
Subject: [sdiy] Civility on the List
In-Reply-To: <946061.49699.qm@web27611.mail.ukl.yahoo.com>
References: <6.2.1.2.2.20070423142038.020f3e20@mail.comcast.net>
	<946061.49699.qm@web27611.mail.ukl.yahoo.com>
Message-ID: <10be95030704231845h4965a485mad2c8b02c71a75ae@mail.gmail.com>

On 4/23/07, karl dalen <dalenkarl at yahoo.se> wrote:
> Right!
>
> What the h..l is going on really??
> I haven't got any of the list demise postings!! :-)
>
> I have got about 5 postings from the past 10 days!!
>
I have +150 messages stored in this gmail acount from that period
and none of them seems uncivilised (?)


Viktor


From jmahoney at gate.net  Tue Apr 24 04:49:17 2007
From: jmahoney at gate.net (John Mahoney)
Date: Mon, 23 Apr 2007 22:49:17 -0400
Subject: [sdiy] Polyphonic tonal disorder!
In-Reply-To: <030101c7831f$b2cea360$0202a8c0@DELL>
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
	<20070419161410.ZTSY27044.ibm64aec.bellsouth.net@VAIO.gate.net>
	<030101c7831f$b2cea360$0202a8c0@DELL>
Message-ID: <20070424024911.IVFR8957.ibm58aec.bellsouth.net@VAIO.gate.net>

At 03:44 AM 4/20/2007, Steve Lenham wrote:

>You're right - the only trimming on the OBX filter is scale and 
>offset for the cutoff frequency.

It can't be too hard to add a resonance trimmer to each voice card, can it?
--
john


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.463 / Virus Database: 269.5.10/774 - Release Date: 4/23/2007 5:26 PM




From asfi at eol.ca  Tue Apr 24 06:03:38 2007
From: asfi at eol.ca (Colin Hinz)
Date: Tue, 24 Apr 2007 00:03:38 -0400 (Eastern Daylight Time)
Subject: [sdiy] Civility on the List
In-Reply-To: <6.2.1.2.2.20070423142038.020f3e20@mail.comcast.net>
References: <380-220074123208925@copper.net>
	<6.2.1.2.2.20070423142038.020f3e20@mail.comcast.net>
Message-ID: <Pine.WNT.4.64.0704232340260.2588@dell-qvon2e3xxt>

On Mon, 23 Apr 2007, Ian Fritz wrote:

> At 02:08 PM 4/23/2007, harrybissell at copper.net wrote:
>
>> I wonder as well if I have missed some posts... I did not
>> see anyone who was particularly uncivil (at least lately) imho...
>
> Same here. Can anybody tell us what is going on?  It's pretty frustrating to 
> post new work and get no response. Is anyone in touch with Rick about this?

Oh, it's very simple. This list is slowly being killed off by all the
top-posting.

 	[ducking and running]

In a slightly more salubrious vein, I should note that last Thursday I
played a gig (described in retrospect by my spouse as "analogue with a
vengeance") wherein I used a very primitive sort of "synth thingy".

Can you recognise it?

http://www.meccanion.com/frogstar/img_3696ws.jpg


And as you can see, the fact that the oscillators are *not* tempco'd
provided some opportunities for a UI guaranteed to baffle just about
any audience. Last Thursday's sure was....

- Colin Hinz
   Toronto, Canada



From asfi at eol.ca  Tue Apr 24 06:12:15 2007
From: asfi at eol.ca (Colin Hinz)
Date: Tue, 24 Apr 2007 00:12:15 -0400 (Eastern Daylight Time)
Subject: [sdiy] More chaos up
In-Reply-To: <6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>
Message-ID: <Pine.WNT.4.64.0704240008420.2588@dell-qvon2e3xxt>

On Sun, 22 Apr 2007, Ian Fritz wrote:

> I have put up information on another chaos system.  Some of this was posted 
> temporarily a couple of years ago, but this time it will stay up.  If there 
> is interest I may do a board for this circuit.
>
>  Ian
>
> http://home.comcast.net/~ijfritz/ch_cir2.htm

Very interesting! Indeed, that's something I'd be interested in playing with.

And without saying, a board would be peachy!

Which OTA were you using in your experiments?

regards,

- Colin Hinz
   Toronto, Canada



From taciturn_unquiet at hotmail.com  Tue Apr 24 06:18:18 2007
From: taciturn_unquiet at hotmail.com (Ian Smith)
Date: Mon, 23 Apr 2007 23:18:18 -0500
Subject: [sdiy] Civility on the List
Message-ID: <BAY141-F21FC269B7C9D853FEDA3DFF54A0@phx.gbl>

'Allo

Would that happen to be a Weird Sound Generator from Ray Wilson's site?

-Ian

p.s. by the way, I'm a newbie here that's been lurking the list for the past 
week or so.

>From: Colin Hinz <asfi at eol.ca>
>To: Synth-Diy <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] Civility on the List
>Date: Tue, 24 Apr 2007 00:03:38 -0400 (Eastern Daylight Time)
>
>In a slightly more salubrious vein, I should note that last Thursday I
>played a gig (described in retrospect by my spouse as "analogue with a
>vengeance") wherein I used a very primitive sort of "synth thingy".
>
>Can you recognise it?
>
>http://www.meccanion.com/frogstar/img_3696ws.jpg
>
>
>And as you can see, the fact that the oscillators are *not* tempco'd
>provided some opportunities for a UI guaranteed to baffle just about
>any audience. Last Thursday's sure was....
>
>- Colin Hinz
>   Toronto, Canada
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_________________________________________________________________
MSN is giving away a trip to Vegas to see Elton John.? Enter to win today. 
http://msnconcertcontest.com?icid-nceltontagline



From xyzzy at sysabend.org  Tue Apr 24 06:27:47 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Mon, 23 Apr 2007 21:27:47 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>
References: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
	<839730.13893.qm@web27609.mail.ukl.yahoo.com>
	<6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>
Message-ID: <20070424042747.GY47569@moo.sysabend.org>

On Mon, Apr 23, 2007 at 04:12:03PM -0700, Barry Klein wrote:
> Did anyone on the list go to the Make Faire in San Mateo last year?  Another
> one is coming up next month.  Looks to be quite interesting but they don't
> give a schedule so I do not know if all goes on at the fairgrounds or some
> offsite - and how late it goes to.  I'd be flying up for either one day or
> both.

Last year it was all in the Fairground.  I guess it took us about 3 hours to
skim the whole thing.  There were several classes you could sign up for that
I just havent found on the Faire's site yet this year but I've been too busy
to really dig also.

I had actually made mention to a couple people that I wanted to do a SDIY
booth there this year, but work nuked that idea.

To be honest, for me while it was a found outing, I didnt have many
takeaways from it.  It didnt spark anything for me, but I will go again and
maybe this time something happens.  Maybe if I'd taken a couple of the
classes that were available.

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From adam at hoodmusic.net  Tue Apr 24 06:46:49 2007
From: adam at hoodmusic.net (adam at hoodmusic.net)
Date: Mon, 23 Apr 2007 23:46:49 -0500
Subject: [sdiy] Multivox MX-201 Multiecho problems
Message-ID: <462D8BB9.70209@hoodmusic.net>

Hello,

    I am looking for a legible schematic for this thing. Or atleast the 
values of the two fuses on the power supply board. Anyone?

Thanks,
adam


From asfi at eol.ca  Tue Apr 24 08:23:31 2007
From: asfi at eol.ca (Colin Hinz)
Date: Tue, 24 Apr 2007 02:23:31 -0400 (Eastern Daylight Time)
Subject: [sdiy] Civility on the List
In-Reply-To: <BAY141-F21FC269B7C9D853FEDA3DFF54A0@phx.gbl>
References: <BAY141-F21FC269B7C9D853FEDA3DFF54A0@phx.gbl>
Message-ID: <Pine.WNT.4.64.0704240216350.2588@dell-qvon2e3xxt>

On Mon, 23 Apr 2007, Ian Smith wrote:

> 'Allo
>
> Would that happen to be a Weird Sound Generator from Ray Wilson's site?

Indeed! It probably helps (for id'ing purposes) that I used essentially
the stock stripboard layout.

> -Ian
>
> p.s. by the way, I'm a newbie here that's been lurking the list for the past 
> week or so.

I'm a newbie that's been mostly lurking here for the past 3.5 years or so.
Welcome to the list.

- Colin Hinz
   Toronto, Canada



From dalenkarl at yahoo.se  Tue Apr 24 13:21:13 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 24 Apr 2007 13:21:13 +0200 (CEST)
Subject: [sdiy] SV: Civility on the List
In-Reply-To: <432314CD-9F3C-481A-B843-754EF08459D0@asapnet.net>
Message-ID: <957731.68295.qm@web27607.mail.ukl.yahoo.com>

Geeeee, this is pretty much unbelievable! Wierd!

Grant!

Pardon me but how and from what do you draw your conclushions really?

You always seams to attack people without checking what people
actually meant in the first place, then jump into the closet and 
hide any further discussions!?

Or are you high on something lately???

1:My mail was about the *list* being stone dead again because
of some *server* or other malfunctions on the net, not people
being stone dead and not about im not getting any replies on
my questions.

How the hell did you came to that anti conclusion????????????????

2:I said HA...HA...HA with a :-) because the only mail that
i could see from the list was yours and Ians, and i tought
there was some PREVIOUS discussing going on that i had missed!

Are you just taking advantage of the situation that many
messages don't go trough to and from the list to express
your innermost complaints or have you not gotten the picture
of what megahom, Karl Ekdhal and i was in reality discussing?

We thought messages are not going trough to the list! Capish!? 

Reg
KD

(other people(Ian for one) has expressed that something are
funny with the **list server** or something else somewhere
else on the net!)


--- Grant Richter <grichter at asapnet.net> skrev:

> This list was populated with the most highly respected specialized  
> experts on the PLANET. Many of the rest are people with degrees or  
> advanced degrees.
> University degrees are good place to start, if you then add to that  
> years of personally funded original research.
> 
> Flat out contradicting known and respected experts is silly and makes  
> the contradicting poster look stupid. I sadly watched the  
> exasperation level of the real experts raise over the years. I know  
> who the expert posters are, because I do background checks and read  
> their web pages before responding.
> 
> The "because I said so" attitude is completely unacceptable in a peer  
> review setting. If you are not willing to justify inflated  
> performance claims with published factual data, then don't post them.  
> You just look foolish by doing so.
> 
> I respectfully suggest that posters consider the emotional impact of  
> their posts, and develop their diplomatic skills in general. If we  
> can not maintain the civility I would expect from a person to person  
> professional conference, then this list has lost the ability to  
> advance the state of the art in synthesis.
> 
> In Closing: Cloning existing designs part by part is not an  
> advancement in the state of the art of synthesis. Only applying  
> original thinking to existing ideas can produce new avenues of  
> research. For this, I heartily salute Prof. Lanterman who is teaching  
> this methodology to his students.
> 
> On Apr 23, 2007, at 10:12 AM, karl dalen wrote:
> 
> > Yes, the list appears to be stone dead!
> > Time to run the backuplist again i suppose!
> >
> > Your next message didnt appear!
> >
> > KD
> >
> > --- megaohm <megaohm1 at gmail.com> skrev:
> >
> >> I read you. Karl. Are you having trouble posting to SDIY? I am,  
> >> too. See my
> >> next messege (hopefully) .
> >>
> >> p.
> >>
> >> On 4/22/07, karl dalen <dalenkarl at yahoo.se> wrote:
> >>>
> >>> bla, bla, bla ,bla.....testing 123!
> >>>
> >>> KD
> >>>




      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From dalenkarl at yahoo.se  Tue Apr 24 14:05:57 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 24 Apr 2007 14:05:57 +0200 (CEST)
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>
Message-ID: <20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>


--- HL-SDK Synths <syntroniks at gmail.com> skrev:

> Same, Sure, some of the people on this list might post a bit more than they
> should (me included), but I don't think it is nearly out of hand.
> 
> (I hate mailing lists rly. Forums FTW!)
> 
> BTW karl, the reason I say that about the dumpster is because it seems like
> some of that hostility was directed at you, and I was making fun of it, and
> I tried to reply to list but I am too stupid to do that consistently. ;)

You had no reason to make fun of it, because it appears that Grant have
misunderstood the entire situation from the beginning,it would have been
nice if you would have read our postings from that perspective that
something was strange with the **list server** somwhere instead of
doing what you did. It clearly shows that we where discussing the
list server being stone dead, nothing else.

That some people here starts to write entire novels about peoples 
behavior as a reply to a 2 sentence reply about a list server that
dont  put trough messages are rather flabbergasting.

KD 
 


> 
> On 4/23/07, Tonelismulas V <tonelismulas at gmail.com> wrote:
> >
> > On 4/23/07, karl dalen <dalenkarl at yahoo.se> wrote:
> > > Right!
> > >
> > > What the h..l is going on really??
> > > I haven't got any of the list demise postings!! :-)
> > >
> > > I have got about 5 postings from the past 10 days!!
> > >
> > I have +150 messages stored in this gmail acount from that period
> > and none of them seems uncivilised (?)
> >
> >
> > Viktor
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From ijfritz at comcast.net  Tue Apr 24 17:52:40 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Tue, 24 Apr 2007 09:52:40 -0600
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>
References: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>
	<20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>
Message-ID: <6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>

At 06:05 AM 4/24/2007, karl dalen wrote:

>--- HL-SDK Synths <syntroniks at gmail.com> skrev:
>
> > Same, Sure, some of the people on this list might post a bit more than they
> > should (me included), but I don't think it is nearly out of hand.
> >
> > (I hate mailing lists rly. Forums FTW!)
> >
> > BTW karl, the reason I say that about the dumpster is because it seems like
> > some of that hostility was directed at you, and I was making fun of it, and
> > I tried to reply to list but I am too stupid to do that consistently. ;)
>
>You had no reason to make fun of it, because it appears that Grant have
>misunderstood the entire situation from the beginning,it would have been
>nice if you would have read our postings from that perspective that
>something was strange with the **list server** somwhere instead of
>doing what you did. It clearly shows that we where discussing the
>list server being stone dead, nothing else.
>
>That some people here starts to write entire novels about peoples
>behavior as a reply to a 2 sentence reply about a list server that
>dont  put trough messages are rather flabbergasting.
>
>KD


KD --

I never got the post you are replying to here here.  Did you get it via the 
list?

   Ian




From richard at atkinsoft.com  Tue Apr 24 18:56:00 2007
From: richard at atkinsoft.com (Richard Atkinson)
Date: Tue, 24 Apr 2007 17:56:00 +0100
Subject: [sdiy] Yamaha SY-2
Message-ID: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>

Hi all,

A quick request for the Yamaha SY-2 service manual (if indeed such a
thing exists), or a schematic at least. I've noticed this crops up
every now and then and seems to go unanswered, so maybe no-one has
one.

Any ideas?

Richard


From brockr0 at shaw.ca  Tue Apr 24 19:09:09 2007
From: brockr0 at shaw.ca (Brock Russell)
Date: Tue, 24 Apr 2007 10:09:09 -0700
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>
References: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>
	<20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>
	<6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>
Message-ID: <6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>

At 08:52 AM 4/24/2007, Ian Fritz wrote:
>At 06:05 AM 4/24/2007, karl dalen wrote:
>
>--- HL-SDK Synths <syntroniks at gmail.com> skrev:
>
> > Same, Sure, some of the people on this list might post a bit more than they
>...snip...
>behavior as a reply to a 2 sentence reply about a list server that
>dont  put trough messages are rather flabbergasting.
>
>KD
>
>KD --
>
>I never got the post you are replying to here here.  Did you get it via 
>the list?
>
>   Ian

I did not get it either. Nor Pengs posts that KD mentioned earlier. Is 
gmail being blocked?

Brock (back to lurking) 



From tim.parkhurst at gmail.com  Tue Apr 24 19:33:39 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Tue, 24 Apr 2007 10:33:39 -0700
Subject: [sdiy] Good Trader: Paul Schreiber
Message-ID: <87441170704241033l7078a316oef6c8d16b5ec6554@mail.gmail.com>

Although I'm fairly sure everyone here already knows this, Paul
Schreiber is a fine gent to deal with. I've bought stuff from MOTM and
never had any problems, and dealing with Paul personally (bought a
book from him recently) is just as trouble free.


Tim (trouble free, but way too much caffeine and calories) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From moogah at gmail.com  Tue Apr 24 19:50:58 2007
From: moogah at gmail.com (Jeff Farr)
Date: Tue, 24 Apr 2007 13:50:58 -0400
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>
References: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>
	<20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>
	<6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>
	<6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>
Message-ID: <78f89520704241050p5eec1cb8i3d62dae1eeb27568@mail.gmail.com>

If your reading this, gmail is not being blocked.

In either case I have no clue what is going on here either.


From dragon.servicing at virgin.net  Tue Apr 24 20:17:54 2007
From: dragon.servicing at virgin.net (Peter Blackett)
Date: Tue, 24 Apr 2007 19:17:54 +0100
Subject: [sdiy] Yamaha SY-2
In-Reply-To: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>
References: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>
Message-ID: <462E49D2.9040603@virgin.net>

Dear Richard,
I think there is a service manual available for the SY2 , but from what 
I can remember it doesn't show what is inside the sealed modules.
regards Peter



Richard Atkinson wrote:

> Hi all,
>
> A quick request for the Yamaha SY-2 service manual (if indeed such a
> thing exists), or a schematic at least. I've noticed this crops up
> every now and then and seems to go unanswered, so maybe no-one has
> one.
>
> Any ideas?
>
> Richard

 


From asfi at eol.ca  Tue Apr 24 21:05:49 2007
From: asfi at eol.ca (Colin Hinz)
Date: Tue, 24 Apr 2007 15:05:49 -0400
Subject: SV: Re: Re: [sdiy] Civility on the List
Message-ID: <34987.1177441549@eol.ca>

 On Tue Apr 24 13:50 , "Jeff Farr"  sent:

> If your reading this, gmail is not being blocked.
>
> In either case I have no clue what is going on here either.

I'm willing to bet that some list members are getting their reply-to-list and reply-to-sender-only wires crossed.

- Colin Hinz
  Toronto, Canada




From controlvoltage at gmail.com  Tue Apr 24 21:25:35 2007
From: controlvoltage at gmail.com (Amos)
Date: Tue, 24 Apr 2007 15:25:35 -0400
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>
References: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>
	<20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>
	<6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>
	<6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>
Message-ID: <908a4c120704241225s244ff57k4c7f26eaf3b4880a@mail.gmail.com>

I am on gmail... I have received some 45 SDIY messages since yesterday...

On 4/24/07, Brock Russell <brockr0 at shaw.ca> wrote:
> At 08:52 AM 4/24/2007, Ian Fritz wrote:
> >At 06:05 AM 4/24/2007, karl dalen wrote:
> >
> >--- HL-SDK Synths <syntroniks at gmail.com> skrev:
> >
> > > Same, Sure, some of the people on this list might post a bit more than they
> >...snip...
> >behavior as a reply to a 2 sentence reply about a list server that
> >dont  put trough messages are rather flabbergasting.
> >
> >KD
> >
> >KD --
> >
> >I never got the post you are replying to here here.  Did you get it via
> >the list?
> >
> >   Ian
>
> I did not get it either. Nor Pengs posts that KD mentioned earlier. Is
> gmail being blocked?
>
> Brock (back to lurking)
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From dlmanley at sonic.net  Tue Apr 24 22:06:38 2007
From: dlmanley at sonic.net (Dave Manley)
Date: Tue, 24 Apr 2007 13:06:38 -0700
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <908a4c120704241225s244ff57k4c7f26eaf3b4880a@mail.gmail.com>
References: <643888bd0704231947u7d9c7254p98fae106d6e068ff@mail.gmail.com>	<20070424120557.85455.qmail@web27605.mail.ukl.yahoo.com>	<6.2.1.2.2.20070424095013.020d7be8@mail.comcast.net>	<6.0.1.1.0.20070424100029.023e9360@shawmail.vc.shawcable.net>
	<908a4c120704241225s244ff57k4c7f26eaf3b4880a@mail.gmail.com>
Message-ID: <462E634E.2060104@sonic.net>

Amos wrote:
> I am on gmail... I have received some 45 SDIY messages since yesterday...
> 

I'm seeing what is in the retrosynth archives:

	http://search.retrosynth.com/synth-diy/index.html

It shows 3 messages on 4/21, 2 messages on 4/22 and 11 messages on 4/23. 
  If there were 45 messages since yesterday, something is broken.

-Dave




From sounddoctorin at imt.net  Tue Apr 24 22:26:09 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Tue, 24 Apr 2007 13:26:09 -0700
Subject: [sdiy] Yamaha SY-2
In-Reply-To: <462E49D2.9040603@virgin.net>
References: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>
	<462E49D2.9040603@virgin.net>
Message-ID: <462E67E1.8070400@imt.net>

Oh that's right..I checked my website and there's a pointer to the sdiy 
link there.   www.imt.net/~sounddoctorin/synthtec should always have any 
manuals that are available.  Let me know if anything is missing that is 
available.  -bob

Peter Blackett wrote:

> Dear Richard,
> I think there is a service manual available for the SY2 , but from 
> what I can remember it doesn't show what is inside the sealed modules.
> regards Peter
>
>
>
> Richard Atkinson wrote:
>
>> Hi all,
>>
>> A quick request for the Yamaha SY-2 service manual (if indeed such a
>> thing exists), or a schematic at least. I've noticed this crops up
>> every now and then and seems to go unanswered, so maybe no-one has
>> one.
>>
>> Any ideas?
>>
>> Richard
>
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>


From dalenkarl at yahoo.se  Tue Apr 24 22:28:40 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 24 Apr 2007 22:28:40 +0200 (CEST)
Subject: SV: Re: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <908a4c120704241225s244ff57k4c7f26eaf3b4880a@mail.gmail.com>
Message-ID: <132338.47908.qm@web27604.mail.ukl.yahoo.com>

45??

I got about 5 or 6!!!

This email list is for sure dysfunctional!!

if gmail works what are you discussing right now?
Because if i look into the archive i don't see 45
postings since yesterday?

Has anyone notified Rick Jansen yet or are
everyone waiting for someone else to notify?? 8-)

KD (who's unbelievable pussled by the situation). 

--- Amos <controlvoltage at gmail.com> skrev:

> I am on gmail... I have received some 45 SDIY messages since yesterday...
> 
> On 4/24/07, Brock Russell <brockr0 at shaw.ca> wrote:
> > At 08:52 AM 4/24/2007, Ian Fritz wrote:
> > >At 06:05 AM 4/24/2007, karl dalen wrote:
> > >
> > >--- HL-SDK Synths <syntroniks at gmail.com> skrev:
> > >
> > > > Same, Sure, some of the people on this list might post a bit more than
> they
> > >...snip...
> > >behavior as a reply to a 2 sentence reply about a list server that
> > >dont  put trough messages are rather flabbergasting.

> > >I never got the post you are replying to here here.  Did you get it via
> > >the list?
> > >
> > >   Ian
> >
> > I did not get it either. Nor Pengs posts that KD mentioned earlier. Is
> > gmail being blocked?
> >
> > Brock (back to lurking)
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
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From np at planetarc.de  Tue Apr 24 23:08:18 2007
From: np at planetarc.de (np)
Date: Tue, 24 Apr 2007 23:08:18 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <462E71C2.8060001@planetarc.de>

Hi list, and hello to some old-timers who remember me.. I've been away 
from the list for several years....

Is anyone familiar with this circuit here:

http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif

It's a long tailed pair with two extra transistors working as diodes. 
Not the same configuration as the linearization diodes we have in some 
OTA's. I gave it a try using a CA3046 transistor array, and it just 
magically works. I can drive the input up to 50mVpp with low distortion. 
Nearly twice as much as without the extra trannies.

To me that looks almost like a free meal. Where's the drawback?

And could someone please shed some light on why these "diodes" work and 
what they do? They somehow linearize the input for sure, but I have no 
clue what exactly is going on here.

Thanks in advance,
  Nils






From cary.roberts at retrosynth.net  Tue Apr 24 23:10:24 2007
From: cary.roberts at retrosynth.net (Cary Roberts)
Date: Tue, 24 Apr 2007 14:10:24 -0700
Subject: [sdiy] sdiy searchable archives [was: Civility on the List]
Message-ID: <000001c786b4$fa368220$d53215ac@camilla>

>> I am on gmail... I have received some 45 SDIY messages since
yesterday...
>>
>
>I'm seeing what is in the retrosynth archives:
>
>http://search.retrosynth.com/synth-diy/index.html
>
>It shows 3 messages on 4/21, 2 messages on 4/22 and 11 messages on
4/23.
>If there were 45 messages since yesterday, something is broken.

Or maybe I moved the search engine to a new host yesteday and didn't
have the indexing working until today.  _NEVER_ use the archives I host
to determine if the synth-diy list is working:

	1) The archive is only indexed every hour.

	2) I do maintenance every once and a while that affects
indexing.


-Cary



From dalenkarl at yahoo.se  Tue Apr 24 23:31:52 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Tue, 24 Apr 2007 23:31:52 +0200 (CEST)
Subject: SV: [sdiy] sdiy searchable archives [was: Civility on the List]
In-Reply-To: <000001c786b4$fa368220$d53215ac@camilla>
Message-ID: <20070424213152.73116.qmail@web27605.mail.ukl.yahoo.com>

Now the confusions are total!

KD


--- Cary Roberts <cary.roberts at retrosynth.net> skrev:

> >> I am on gmail... I have received some 45 SDIY messages since
> yesterday...
> >>
> >
> >I'm seeing what is in the retrosynth archives:
> >
> >http://search.retrosynth.com/synth-diy/index.html
> >
> >It shows 3 messages on 4/21, 2 messages on 4/22 and 11 messages on
> 4/23.
> >If there were 45 messages since yesterday, something is broken.
> 
> Or maybe I moved the search engine to a new host yesteday and didn't
> have the indexing working until today.  _NEVER_ use the archives I host
> to determine if the synth-diy list is working:
> 
> 	1) The archive is only indexed every hour.
> 
> 	2) I do maintenance every once and a while that affects
> indexing.
> 
> 
> -Cary
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      __________________________________________________________
Hitta din n?sta resa p? Yahoo! Shopping.
J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html


From cfmd at bredband.net  Tue Apr 24 23:35:56 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Tue, 24 Apr 2007 23:35:56 +0200 (CEST)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <462E71C2.8060001@planetarc.de>
References: <462E71C2.8060001@planetarc.de>
Message-ID: <20070424.233556.-1702265629.cfmd@bredband.net>

From: np <np at planetarc.de>
Subject: [sdiy] improved dynamic range diffpair-vca
Date: Tue, 24 Apr 2007 23:08:18 +0200
Message-ID: <462E71C2.8060001 at planetarc.de>

Hi Nils,

> Hi list, and hello to some old-timers who remember me.. I've been away 
> from the list for several years....

It's been a long time! Welcome back!

> Is anyone familiar with this circuit here:
> 
> http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif
> 
> It's a long tailed pair with two extra transistors working as diodes. 
> Not the same configuration as the linearization diodes we have in some 
> OTA's. I gave it a try using a CA3046 transistor array, and it just 
> magically works. I can drive the input up to 50mVpp with low distortion. 
> Nearly twice as much as without the extra trannies.
> 
> To me that looks almost like a free meal. Where's the drawback?
> 
> And could someone please shed some light on why these "diodes" work and 
> what they do? They somehow linearize the input for sure, but I have no 
> clue what exactly is going on here.

It is actually quite simple. You require twice as much Vbe to acheive the same
current, the resulting arctanh function thus scale the input differently.
That's what's happening. The Ice current is the same for both diodes.

The obvious drawback is that you require additional trannies. You also want
them to be arrays such as 3046 for thermal coupling.

6 dB more is good. However, how can we make it take towards 10-20 Vpp signals?
How about some clever Vbe/Ice scaling or something? Such that Instead of doing
+ 1 diode-voltage you get + 200 or something. I am thinking in terms of tossing
in some resistors for the additional transistors. Using that and some
linearization and you should have a large-signal linear solution in your hands.

Cheers,
Magnus


From tdr3r at virginia.edu  Tue Apr 24 23:46:56 2007
From: tdr3r at virginia.edu (Tom Rose)
Date: Tue, 24 Apr 2007 17:46:56 -0400
Subject: [sdiy] Newbie synth question Imagine that a synth question on this
	list
Message-ID: <4442DEE3-EFA6-435C-B99C-0408FF211D47@virginia.edu>

Sorry for the sarcasm but hey the last few days have been pretty silly

for the question

The Korg 770 shows a primitive breath controller in the catalog.  
Would any one have a schematic or ideas about how to build such a  
beast????

  Much appreciated

Tom




From controlvoltage at gmail.com  Wed Apr 25 00:05:14 2007
From: controlvoltage at gmail.com (Amos)
Date: Tue, 24 Apr 2007 18:05:14 -0400
Subject: SV: Re: Re: [sdiy] Civility on the List
In-Reply-To: <132338.47908.qm@web27604.mail.ukl.yahoo.com>
References: <908a4c120704241225s244ff57k4c7f26eaf3b4880a@mail.gmail.com>
	<132338.47908.qm@web27604.mail.ukl.yahoo.com>
Message-ID: <908a4c120704241505h221a77bfk44caa8a9aa8dcfc6@mail.gmail.com>

sorry, sorry for the extra confusion!

You see, Gmail keeps messages sorted by thread... each thread comes up
with the date of the *most recent* post to it... and the number of
posts in the thread.  I added up all these numbers and got 45, not
thinking that only the most recent post to each thread was from
yesterday or today.  Silly mistake!

-Amos

On 4/24/07, karl dalen <dalenkarl at yahoo.se> wrote:
> 45??
>
> I got about 5 or 6!!!
>
> This email list is for sure dysfunctional!!
>
> if gmail works what are you discussing right now?
> Because if i look into the archive i don't see 45
> postings since yesterday?
>
> Has anyone notified Rick Jansen yet or are
> everyone waiting for someone else to notify?? 8-)
>
> KD (who's unbelievable pussled by the situation).
>
> --- Amos <controlvoltage at gmail.com> skrev:
>
> > I am on gmail... I have received some 45 SDIY messages since yesterday...
> >
> > On 4/24/07, Brock Russell <brockr0 at shaw.ca> wrote:
> > > At 08:52 AM 4/24/2007, Ian Fritz wrote:
> > > >At 06:05 AM 4/24/2007, karl dalen wrote:
> > > >
> > > >--- HL-SDK Synths <syntroniks at gmail.com> skrev:
> > > >
> > > > > Same, Sure, some of the people on this list might post a bit more than
> > they
> > > >...snip...
> > > >behavior as a reply to a 2 sentence reply about a list server that
> > > >dont  put trough messages are rather flabbergasting.
>
> > > >I never got the post you are replying to here here.  Did you get it via
> > > >the list?
> > > >
> > > >   Ian
> > >
> > > I did not get it either. Nor Pengs posts that KD mentioned earlier. Is
> > > gmail being blocked?
> > >
> > > Brock (back to lurking)
> > >
> > > _______________________________________________
> > > Synth-diy mailing list
> > > Synth-diy at dropmix.xs4all.nl
> > > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
>
>
>       __________________________________________________________
> Hitta din n?sta resa p? Yahoo! Shopping.
> J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
>



From jhaible at debitel.net  Wed Apr 25 00:25:37 2007
From: jhaible at debitel.net (JH.)
Date: Wed, 25 Apr 2007 00:25:37 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <462E71C2.8060001@planetarc.de>
Message-ID: <001301c786bf$7da661c0$0200a8c0@jhsilent>

> To me that looks almost like a free meal. Where's the drawback?

Is it true that it has 6dB SNR improovement?
I would expect 3dB ( SQRT(2) times noise, vs. 2 times signal level ) - just 
as with two pairs in parallel.

JH.

----- Original Message ----- 
From: "np" <np at planetarc.de>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, April 24, 2007 11:08 PM
Subject: [sdiy] improved dynamic range diffpair-vca


Hi list, and hello to some old-timers who remember me.. I've been away
from the list for several years....

Is anyone familiar with this circuit here:

http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif

It's a long tailed pair with two extra transistors working as diodes.
Not the same configuration as the linearization diodes we have in some
OTA's. I gave it a try using a CA3046 transistor array, and it just
magically works. I can drive the input up to 50mVpp with low distortion.
Nearly twice as much as without the extra trannies.

To me that looks almost like a free meal. Where's the drawback?

And could someone please shed some light on why these "diodes" work and
what they do? They somehow linearize the input for sure, but I have no
clue what exactly is going on here.

Thanks in advance,
  Nils




_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




From cfmd at bredband.net  Wed Apr 25 00:36:08 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 25 Apr 2007 00:36:08 +0200 (CEST)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <001301c786bf$7da661c0$0200a8c0@jhsilent>
References: <462E71C2.8060001@planetarc.de>
	<001301c786bf$7da661c0$0200a8c0@jhsilent>
Message-ID: <20070425.003608.879564923.cfmd@bredband.net>

From: "JH." <jhaible at debitel.net>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: Wed, 25 Apr 2007 00:25:37 +0200
Message-ID: <001301c786bf$7da661c0$0200a8c0 at jhsilent>

> > To me that looks almost like a free meal. Where's the drawback?
> 
> Is it true that it has 6dB SNR improovement?
> I would expect 3dB ( SQRT(2) times noise, vs. 2 times signal level ) - just 
> as with two pairs in parallel.

This is not a noise improvement as such but rather about being able to use
higher amplitude, and since you can use twice the amplitude for the same
distorsion you get 6 dB in improved SNR.

Cheers,
Magnus


From jhaible at debitel.net  Wed Apr 25 00:38:27 2007
From: jhaible at debitel.net (JH.)
Date: Wed, 25 Apr 2007 00:38:27 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <462E71C2.8060001@planetarc.de><001301c786bf$7da661c0$0200a8c0@jhsilent>
	<20070425.003608.879564923.cfmd@bredband.net>
Message-ID: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent>

>This is not a noise improvement as such but rather about being able to use
>higher amplitude, and since you can use twice the amplitude for the same
>distorsion you get 6 dB in improved SNR.

But I'd expect the extra transitors to add some noise as well!

JH.



From cfmd at bredband.net  Wed Apr 25 00:45:55 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 25 Apr 2007 00:45:55 +0200 (CEST)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent>
References: <001301c786bf$7da661c0$0200a8c0@jhsilent>
	<20070425.003608.879564923.cfmd@bredband.net>
	<001d01c786c1$47d2b5b0$0200a8c0@jhsilent>
Message-ID: <20070425.004555.-120361040.cfmd@bredband.net>

From: "JH." <jhaible at debitel.net>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: Wed, 25 Apr 2007 00:38:27 +0200
Message-ID: <001d01c786c1$47d2b5b0$0200a8c0 at jhsilent>

> >This is not a noise improvement as such but rather about being able to use
> >higher amplitude, and since you can use twice the amplitude for the same
> >distorsion you get 6 dB in improved SNR.
> 
> But I'd expect the extra transitors to add some noise as well!

Yes, but considering the configuration the distorsion will be the killer
anyway, so that will dominate the noise part and thus SNR reference.

Cheers,
Magnus


From lanterma at ece.gatech.edu  Wed Apr 25 00:46:47 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Tue, 24 Apr 2007 18:46:47 -0400 (EDT)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <462E71C2.8060001@planetarc.de>
References: <462E71C2.8060001@planetarc.de>
Message-ID: <Pine.GSO.4.60.0704241846190.27926@yamsrv1.ece.gatech.edu>


On Tue, 24 Apr 2007, np wrote:

> http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif
>
> It's a long tailed pair with two extra transistors working as diodes. Not the 
> same configuration as the linearization diodes we have in some OTA's. I gave

Anybody seen the patent this is based on?

- Aaron

-----------------------------------------------------------------------------

Dr. Aaron Lanterman, Asst. Prof.
and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
College of Electri. and Comp. Eng.   Fax:    404-894-8363
Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
Atlanta, GA 30332                    Office: Centergy 5212



From obl64 at ix.netcom.com  Wed Apr 25 00:48:37 2007
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Tue, 24 Apr 2007 15:48:37 -0700
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <462E71C2.8060001@planetarc.de>
References: <462E71C2.8060001@planetarc.de>
Message-ID: <462E8945.4010003@ix.netcom.com>

np wrote:
> Hi list, and hello to some old-timers who remember me.. I've been away 
> from the list for several years....
> 
> Is anyone familiar with this circuit here:
> 
> http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif
> 
> It's a long tailed pair with two extra transistors working as diodes. 
> Not the same configuration as the linearization diodes we have in some 
> OTA's. I gave it a try using a CA3046 transistor array, and it just 
> magically works. I can drive the input up to 50mVpp with low distortion. 
> Nearly twice as much as without the extra trannies.
> 
> To me that looks almost like a free meal. Where's the drawback?
> 
> And could someone please shed some light on why these "diodes" work and 
> what they do? They somehow linearize the input for sure, but I have no 
> clue what exactly is going on here.
> 
> Thanks in advance,
>  Nils
> 
> 
>

Thanks Nils, for sharing this.
I have a lot of MAT04s that ought to work fine with this design.
Welcome back!
- Oren


From obl64 at ix.netcom.com  Wed Apr 25 01:15:01 2007
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Tue, 24 Apr 2007 16:15:01 -0700
Subject: [sdiy] More chaos up
In-Reply-To: <6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>
Message-ID: <462E8F75.4070101@ix.netcom.com>

Ian Fritz wrote:
> Hello --
> 
> I have put up information on another chaos system.  Some of this was 
> posted temporarily a couple of years ago, but this time it will stay 
> up.  If there is interest I may do a board for this circuit.
> 
>   Ian
> 
> http://home.comcast.net/~ijfritz/ch_cir2.htm

Thanks for posting this update Ian!
I like the simple Double-Well implementation you have here, too.
http://home.comcast.net/~ijfritz/ch_cir1.htm
- Oren


From julian at 22host24.com  Wed Apr 25 01:22:41 2007
From: julian at 22host24.com (Julian)
Date: Wed, 25 Apr 2007 00:22:41 +0100
Subject: [sdiy] Pt6608 and Pt6607 LCD Driver Ics?
Message-ID: <Zen-1HgULH-00088a-Pk@pythagoras.zen.co.uk>

Im afraid its not exactly synth, but im having some problems with another piece of sound equipment, and figured it may well be
likely that someone here may have had experience of these chips?

Here's the datasheet - 

http://www.kamaka.de/pdf-files/princeton%20technology%20corporation/lcd%20driver%20ic%20series/6608s.pdf

Im having lines die on the LCD screen.  Initially just one, but now more and more (pretty rapid mortality rate), and its starting to
get hard to read whats going on.

Any takers?  ; )

Cheers, Julian



From jmahoney at gate.net  Wed Apr 25 01:56:26 2007
From: jmahoney at gate.net (John Mahoney)
Date: Tue, 24 Apr 2007 19:56:26 -0400
Subject: [sdiy] More chaos up
In-Reply-To: <462E8F75.4070101@ix.netcom.com>
References: <200704050218.l352IpX9009809@linux7.lan>
	<6.2.1.2.2.20070422184629.020f6090@mail.comcast.net>
	<462E8F75.4070101@ix.netcom.com>
Message-ID: <20070424235615.PRUO6181.ibm67aec.bellsouth.net@VAIO.gate.net>


>
>Ian Fritz wrote:
>>Hello --
>>I have put up information on another chaos system.  Some of this 
>>was posted temporarily a couple of years ago, but this time it will 
>>stay up.  If there is interest I may do a board for this circuit.
>>   Ian
>>http://home.comcast.net/~ijfritz/ch_cir2.htm
>
>Thanks for posting this update Ian!
[snip]

Yes, yes, thanks for your continued chaos posts! I'd buy a board if 
you made a run.
--
john


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.463 / Virus Database: 269.5.10/774 - Release Date: 4/23/2007 5:26 PM




From jhaible at debitel.net  Wed Apr 25 02:06:53 2007
From: jhaible at debitel.net (JH.)
Date: Wed, 25 Apr 2007 02:06:53 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <001301c786bf$7da661c0$0200a8c0@jhsilent><20070425.003608.879564923.cfmd@bredband.net><001d01c786c1$47d2b5b0$0200a8c0@jhsilent>
	<20070425.004555.-120361040.cfmd@bredband.net>
Message-ID: <003201c786cd$a295ea60$0200a8c0@jhsilent>

>Yes, but considering the configuration the distorsion will be the killer
>anyway

You set an amount of distortion that you consider tolerable.
This results in a certain signal level on an ordinard differential pair.
That level, divided by the noise of the pair, is the SNR.

With the proposed circuit, and the same amount of distortion, you can have 
twice the signal level.
And you'll get SQRT(2) times the noise.
Resulting in 2 / SQRT(2) = SQRT(2), or 3dB,  SNR improovement.

If this is true, it's true for any amount of distortion you choose.

JH.




From profpep at hotmail.com  Wed Apr 25 02:17:35 2007
From: profpep at hotmail.com (Mike)
Date: Wed, 25 Apr 2007 01:17:35 +0100
Subject: [sdiy] Pt6608 and Pt6607 LCD Driver Ics?
References: <Zen-1HgULH-00088a-Pk@pythagoras.zen.co.uk>
Message-ID: <BAY133-DAV57569C698233AF4C985B2A1490@phx.gbl>

> Im afraid its not exactly synth, but im having some problems with another
piece of sound equipment, and figured it may well be
> likely that someone here may have had experience of these chips?
>
It may not be the chips. A lot of LCD's use a 'zebra pad' to connect them to
the PCB. these can be affecte by moisture and stop connecting. I've fixed
phone and hand held instrument displays, with the same symptoms, by
dismantling, cleaning up the contact area, and reassembling.

HTH

Mike



From cfmd at bredband.net  Wed Apr 25 02:21:45 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 25 Apr 2007 02:21:45 +0200 (CEST)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <003201c786cd$a295ea60$0200a8c0@jhsilent>
References: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent>
	<20070425.004555.-120361040.cfmd@bredband.net>
	<003201c786cd$a295ea60$0200a8c0@jhsilent>
Message-ID: <20070425.022145.1910046134.cfmd@bredband.net>

From: "JH." <jhaible at debitel.net>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: Wed, 25 Apr 2007 02:06:53 +0200
Message-ID: <003201c786cd$a295ea60$0200a8c0 at jhsilent>

> >Yes, but considering the configuration the distorsion will be the killer
> >anyway
> 
> You set an amount of distortion that you consider tolerable.
> This results in a certain signal level on an ordinard differential pair.
> That level, divided by the noise of the pair, is the SNR.
> 
> With the proposed circuit, and the same amount of distortion, you can have 
> twice the signal level.
> And you'll get SQRT(2) times the noise.
> Resulting in 2 / SQRT(2) = SQRT(2), or 3dB,  SNR improovement.
> 
> If this is true, it's true for any amount of distortion you choose.

It really differs what you define as noise in this case. If you only consider
white noise, pink noise (i.e. random sources) etc. then you are certainly
correct. Another form is "anything but". This includes hum and its overtones,
harmonic and non-harmonic distorsion etc. In this form noise is all unwanted
signal. This form is usefull for actual dynamics.

Also, you are assuming that the transistors are the main source of noise.
They don't need to be.

So it all depends. Saying it is 6 dB SNR improvement is a sloopy way of saying
it, but for the same drive-level will the distorsion be another 6 dB down.
That is certainly usefull. The noise floor moves up by 3 dB thought, but that
may be a much less problem (and I think it is).

If you want a really high-dynamics VCA the Drawmer 4-transistor setup should be
a win. I beleive that the THAT VCAs still use that configuration, but with the
refinements that comes with sitting on the same silicon etc. Haven't measured
the THD of that one thought.

Cheers,
Magnus


From julian at 22host24.com  Wed Apr 25 02:56:43 2007
From: julian at 22host24.com (Julian)
Date: Wed, 25 Apr 2007 01:56:43 +0100
Subject: [sdiy] Pt6608 and Pt6607 LCD Driver Ics?
In-Reply-To: <BAY133-DAV57569C698233AF4C985B2A1490@phx.gbl>
Message-ID: <Zen-1HgVoH-0007JS-M4@rutherford.zen.co.uk>


> > Im afraid its not exactly synth, but im having some problems with  another piece of sound equipment, and figured it may well be
> > likely that someone here may have had experience of these chips?

> It may not be the chips. A lot of LCD's use a 'zebra pad' to 
> connect them to the PCB. these can be affecte by moisture and 
> stop connecting. I've fixed phone and hand held instrument 
> displays, with the same symptoms, by dismantling, cleaning up 
> the contact area, and reassembling.


Thanks Mike, 

That's exactly what it was.  Ive just had the assembly appart, and some rubbing on the t-shirt has solved the issues (too lazy to
find the isopro...)

At least I can see what im doing now, when I see if the audio is correct.

Cheers, Julian





From grichter at asapnet.net  Wed Apr 25 04:14:03 2007
From: grichter at asapnet.net (Grant Richter)
Date: Tue, 24 Apr 2007 21:14:03 -0500
Subject: [sdiy] [RE: Civility on the List]
In-Reply-To: <000001c786b4$fa368220$d53215ac@camilla>
References: <000001c786b4$fa368220$d53215ac@camilla>
Message-ID: <6F8DEA8D-3AC9-4CAB-B999-EB9CABA885EB@asapnet.net>

That post was some kind of net ghost (or a glitch in my mail  
program), I thought I sent it months ago.

It had nothing to do with Karl or anyone who received it by mistake.

I apologize to any one offended and for the confusion.



From abis at rogers.com  Wed Apr 25 04:18:56 2007
From: abis at rogers.com (Andrew Beeton)
Date: Tue, 24 Apr 2007 22:18:56 -0400
Subject: [sdiy] Weird Sound Generator
Message-ID: <1b5fc0e8c29d48ef6a24104494483d6e@rogers.com>

Colin Hinz and I have been discussing the WSG. I thought I'd give this 
thread its own home, as things seem  fairly civil here! Any thoughts or 
comments on the WSG are more than welcome.

I am alternating between using one of those cigarette pack mini amps 
and a regular guitar amp. Perhaps I should add a volume pot to the 
unfiltered output. The filtered output is giving me a reasonable level.

One other question I had about the WSG is in regards to using the other 
half of the chip. What order do the pins correspond to? Should pins 13 
and 12 correspond to 1 and 2, etc.?

I tend to go between Honson/Supremetronic and Creatron to buy parts in 
Toronto. I should be able to scrape together enough for a few more 
pots.

Cheers,

Andrew

> I've built my WSG using the PDF from Ray Wilson web site. Mine is the 5
> pot version, as I don't have enough pots to add the use the other half
> of the chip yet. What I have found is that the unfiltered output is
> extremely loud. So much so that the neighbours can hear it even when
> the volume on my old amp is turned to 0. Before I put it on perf board,
> I'd like to figure out why this is. Any thoughts on how to troubleshoot
> this would be appreciated. As I said in an earlier post, I am new to
> this whole electronics world.

I don't think there's anything "wrong" with how you've constructed your 
WSG. Although I confess I haven't actually looked at the output with an 
oscilloscope, I would expect the non-filtered output to be pretty close 
to the battery voltage.....that's assuming your amp has a pretty 
high-impedance input. That's a pretty "hot" signal if your amp is 
expecting a line-level input.

I anticipated this sort of problem when I built mine, which is why I 
modified the circuit to include volume pots. (And in my case I overdid 
it a bit, as even with the volume turned all the way up, it is pretty 
quiet. Back to the soldering iron!)

> Also, I was wondering where you perform, as I am also in Toronto.

Well, I have to admit that I don't get out for gigs nearly as often as 
I like. Last Thursday was just a PWYC kinda thing in a friend's living 
room. Still, it was a really PACKED living room......the previous 
occasion was over a year ago (but that was at the Drake Underground). 
With any luck the next one will be sometime before (!!!!) 2008.

I do my solo stuff under the name 'Forktine' and I'm also in a 
improvised noise group called 'Six Heads'.

How about yourself?

- Colin

PS: Where are you getting your parts? If you need more pots, they're 70 
cents each at Honson/Supremetronic. 



From rdrake at data2action.com  Wed Apr 25 04:53:06 2007
From: rdrake at data2action.com (rdrake)
Date: Tue, 24 Apr 2007 22:53:06 -0400
Subject: =?US-ASCII?B?UkU6IFtzZGl5XSBXZWlyZCBTb3VuZCBHZW5lcmF0b3I=?=
Message-ID: <20070425025306.52637.qmail@mmm1113.verio-web.com>

andrew,

yes on the pin-outs... in/out pairs for the gates are 1/2, 3/4, 5/6, 9/8, 11/10, and 13/12.  

there's a handy stripboard layout for a dual WSG here: http://electro-music.com/forum/viewtopic.php?t=7074.  uses the second half of the 40106 to create the second circuit.  i've built it & it works.  

b

>----- ------- Original Message ------- -----
>From: abis at rogers.com
>To: Synth-diy at dropmix.xs4all.nl
>Sent: Tue, 24 Apr 2007 22:18:56
>
>Colin Hinz and I have been discussing the WSG. I
>thought I'd give this 
>thread its own home, as things seem  fairly civil
>here! Any thoughts or 
>comments on the WSG are more than welcome.
>
>I am alternating between using one of those
>cigarette pack mini amps 
>and a regular guitar amp. Perhaps I should add a
>volume pot to the 
>unfiltered output. The filtered output is giving me
>a reasonable level.
>
>One other question I had about the WSG is in
>regards to using the other 
>half of the chip. What order do the pins correspond
>to? Should pins 13 
>and 12 correspond to 1 and 2, etc.?
>
>I tend to go between Honson/Supremetronic and
>Creatron to buy parts in 
>Toronto. I should be able to scrape together enough
>for a few more 
>pots.
>
>Cheers,
>
>Andrew
>
>> I've built my WSG using the PDF from Ray Wilson
>web site. Mine is the 5
>> pot version, as I don't have enough pots to add
>the use the other half
>> of the chip yet. What I have found is that the
>unfiltered output is
>> extremely loud. So much so that the neighbours
>can hear it even when
>> the volume on my old amp is turned to 0. Before I
>put it on perf board,
>> I'd like to figure out why this is. Any thoughts
>on how to troubleshoot
>> this would be appreciated. As I said in an
>earlier post, I am new to
>> this whole electronics world.
>
>I don't think there's anything "wrong" with how
>you've constructed your 
>WSG. Although I confess I haven't actually looked
>at the output with an 
>oscilloscope, I would expect the non-filtered
>output to be pretty close 
>to the battery voltage.....that's assuming your amp
>has a pretty 
>high-impedance input. That's a pretty "hot" signal
>if your amp is 
>expecting a line-level input.
>
>I anticipated this sort of problem when I built
>mine, which is why I 
>modified the circuit to include volume pots. (And
>in my case I overdid 
>it a bit, as even with the volume turned all the
>way up, it is pretty 
>quiet. Back to the soldering iron!)
>
>> Also, I was wondering where you perform, as I am
>also in Toronto.
>
>Well, I have to admit that I don't get out for gigs
>nearly as often as 
>I like. Last Thursday was just a PWYC kinda thing
>in a friend's living 
>room. Still, it was a really PACKED living
>room......the previous 
>occasion was over a year ago (but that was at the
>Drake Underground). 
>With any luck the next one will be sometime before
>(!!!!) 2008.
>
>I do my solo stuff under the name 'Forktine' and
>I'm also in a 
>improvised noise group called 'Six Heads'.
>
>How about yourself?
>
>- Colin
>
>PS: Where are you getting your parts? If you need
>more pots, they're 70 
>cents each at Honson/Supremetronic. 
>
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From brockr0 at shaw.ca  Wed Apr 25 06:54:23 2007
From: brockr0 at shaw.ca (Brock Russell)
Date: Tue, 24 Apr 2007 21:54:23 -0700
Subject: [sdiy] Newbie synth question Imagine that a synth question  on
	this	list
In-Reply-To: <4442DEE3-EFA6-435C-B99C-0408FF211D47@virginia.edu>
References: <4442DEE3-EFA6-435C-B99C-0408FF211D47@virginia.edu>
Message-ID: <6.0.1.1.0.20070424214442.025193f8@shawmail.vc.shawcable.net>

Tom,

The breath controller expert around here is Ian Fritz.
http://home.comcast.net/~ijfritz/index.htm

Brock


At 02:46 PM 4/24/2007, Tom Rose wrote:
>Sorry for the sarcasm but hey the last few days have been pretty silly
>
>for the question
>
>The Korg 770 shows a primitive breath controller in the catalog.
>Would any one have a schematic or ideas about how to build such a
>beast????
>
>  Much appreciated
>
>Tom



From taciturn_unquiet at hotmail.com  Wed Apr 25 07:31:04 2007
From: taciturn_unquiet at hotmail.com (Ian Smith)
Date: Wed, 25 Apr 2007 00:31:04 -0500
Subject: [sdiy] Weird Sound Generator
In-Reply-To: <1b5fc0e8c29d48ef6a24104494483d6e@rogers.com>
Message-ID: <BAY141-F767BF87C51ABF26E769B8F5490@phx.gbl>

Hey-O,

When I built my WSG, I didn't have enough parts to build the filter, so I 
have a paltry 4 knobs. It still makes amazing sounds though. I have the 
output wired to both a 1/4 inch jack and a Rat Shack piezo buzzer. The 
buzzer is pretty quiet and you have to put your ear to the hole in the thing 
to get a decent listen to it when it's not hooked up to an amp. I built it 
into a gutted out Magic 8 Ball... kinda looks like an underwater mine.

picture here:

http://www.deviantart.com/deviation/49650660/?qo=7&q=by%3Ataciturnunquiet&qh=sort%3Atime+-in%3Ascraps

-Ian

>From: Andrew Beeton <abis at rogers.com>
>To: Synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] Weird Sound Generator
>Date: Tue, 24 Apr 2007 22:18:56 -0400
>
>Colin Hinz and I have been discussing the WSG. I thought I'd give this 
>thread its own home, as things seem  fairly civil here! Any thoughts or 
>comments on the WSG are more than welcome.
>
>I am alternating between using one of those cigarette pack mini amps and a 
>regular guitar amp. Perhaps I should add a volume pot to the unfiltered 
>output. The filtered output is giving me a reasonable level.

_________________________________________________________________
Download Messenger. Join the i?m Initiative. Help make a difference today. 
http://im.live.com/messenger/im/home/?source=TAGHM_APR07



From aym-htnys at teaser.fr  Wed Apr 25 09:28:51 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Wed, 25 Apr 2007 09:28:51 +0200
Subject: [sdiy] For those who think they are missing list posts
Message-ID: <20070425072851.GA21015@aym.net2.nerim.net>

This is what I got since the list restarted on 2007-03-27. 493
messages.

  http://www.teaser.fr/~amajorel/misc/sdiy-index.txt

Not sorted, i.e. in order of arrival.

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From jhaible at debitel.net  Wed Apr 25 09:31:37 2007
From: jhaible at debitel.net (JH.)
Date: Wed, 25 Apr 2007 09:31:37 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent><20070425.004555.-120361040.cfmd@bredband.net><003201c786cd$a295ea60$0200a8c0@jhsilent>
	<20070425.022145.1910046134.cfmd@bredband.net>
Message-ID: <001001c7870b$c36ed880$0200a8c0@jhsilent>

>It really differs what you define as noise in this case. If you only 
>consider
>white noise, pink noise (i.e. random sources) etc. then you are certainly
>correct. Another form is "anything but". This includes hum and its 
>overtones,
>harmonic and non-harmonic distorsion etc. In this form noise is all 
>unwanted
>signal. This form is usefull for actual dynamics.

That's all nice and well, and I can certainly ruin the best Blackmer VCA by 
adding a ground loop and placing it near a transformer. But that's hardly 
the question when we're talking about SNR improovement of one topology 
compared to another. What I want to know: Is my 3dB calculation basically 
right (asuming the diode connected transistors contribute about the same 
amount of noise as the other transistors), or does the circuit really have 
the potential to give 6dB SNR improovement (Because, for instance, the 
diodes contribute less noise than the other transistors) ?

JH. 



From np at planetarc.de  Wed Apr 25 10:23:19 2007
From: np at planetarc.de (np)
Date: Wed, 25 Apr 2007 10:23:19 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <001001c7870b$c36ed880$0200a8c0@jhsilent>
References: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent><20070425.004555.-120361040.cfmd@bredband.net><003201c786cd$a295ea60$0200a8c0@jhsilent>
	<20070425.022145.1910046134.cfmd@bredband.net>
	<001001c7870b$c36ed880$0200a8c0@jhsilent>
Message-ID: <462F0FF7.9070209@planetarc.de>

Thanks everyone for answering. Now I got the idea why it works.

I've done a plot of the base voltage vs. the output of my differential 
amplifier. The circuit wasn't trimmed, and my differential amplifier is 
inverting so the curve is mirrored. You can estimate the amount of 
distortion based on the base voltage drive though:

http://torus.untergrund.net/vca_improved_trace.gif

Regarding noise: My primary source of noise is hum and rf stray-ins. I 
doubt that the extra np-connection will contribute that much, but beeing 
able to drive the base harder was a win SNR-wise. At least for me.

Nils








From aym-htnys at teaser.fr  Wed Apr 25 12:40:29 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Wed, 25 Apr 2007 12:40:29 +0200
Subject: [sdiy] For those who think they are missing list posts
In-Reply-To: <20070425072851.GA21015@aym.net2.nerim.net>
References: <20070425072851.GA21015@aym.net2.nerim.net>
Message-ID: <20070425104029.GB21015@aym.net2.nerim.net>

On 2007-04-25 09:28 +0200, Andre Majorel wrote:

> This is what I got since the list restarted on 2007-03-27. 493
> messages.
> 
>   http://www.teaser.fr/~amajorel/misc/sdiy-index.txt

The message IDs are there (sorted) :

  http://www.teaser.fr/~amajorel/misc/sdiy-msgid.txt

Assuming your synth-diy mailbox is synth-diy.mbx, this command
will extract the message IDs in it into synth-diy.msgid :

  awk '! inpar && /^From .*@.* 2007 *$/ { inheaders = 1 }
    /^$/ { inpar = 0; inheaders = 0 }
    /./ { inpar = 1 }
    inheaders && tolower($1) == "message-id:" { print $2 }' synth-diy.mbx |
    sort >synth-diy.msgid

If synth-diy.msgid and sdiy-msgid.txt are identical, we have got
exactly the same messages. Otherwise, this command will give you
the messages you missed :

  join -v 1 sdiy-msgid.txt synth-diy.msgid

And that one the messages I missed :

  join -v 2 sdiy-msgid.txt synth-diy.msgid

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From richard at atkinsoft.com  Wed Apr 25 13:23:06 2007
From: richard at atkinsoft.com (Richard Atkinson)
Date: Wed, 25 Apr 2007 12:23:06 +0100
Subject: [sdiy] Yamaha SY-2
In-Reply-To: <462E49D2.9040603@virgin.net>
References: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>
	<462E49D2.9040603@virgin.net>
Message-ID: <fcbfde580704250423l300e71advbb9b511edd260107@mail.gmail.com>

Thank you to everyone who replied regarding the SY-2. I will be
receiving mine (in some need of repair) in a few weeks. Hopefully the
problem with the pulse wave output will turn out to be in the external
components and not in the epoxied modules!

Richard

On 4/24/07, Peter Blackett <dragon.servicing at virgin.net> wrote:
> Dear Richard,
> I think there is a service manual available for the SY2 , but from what
> I can remember it doesn't show what is inside the sealed modules.
> regards Peter
>
>
>
> Richard Atkinson wrote:
>
> > Hi all,
> >
> > A quick request for the Yamaha SY-2 service manual (if indeed such a
> > thing exists), or a schematic at least. I've noticed this crops up
> > every now and then and seems to go unanswered, so maybe no-one has
> > one.
> >
> > Any ideas?
> >
> > Richard
>
>
>


From synthusiast at gmx.net  Wed Apr 25 14:02:49 2007
From: synthusiast at gmx.net (Synthusiast)
Date: Wed, 25 Apr 2007 14:02:49 +0200
Subject: [sdiy] Yamaha SY-2
References: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com><462E49D2.9040603@virgin.net>
	<fcbfde580704250423l300e71advbb9b511edd260107@mail.gmail.com>
Message-ID: <002701c78731$a803b130$0100000a@m>

>Hopefully the problem with the pulse wave output will turn out to be in the 
>external components and not in the epoxied modules!

Interesting. I had a SY-2 here a few weeks back with the same problem. It 
turned out that the offset of the sawtooth output (from the epoxied 
module...) was several volts high. This caused the pulse waveshaper, that 
runs on the sawtooth output, to stop functioning. The offset couldn't be 
trimmed away, so I put a small capacitor between the sawtooth output and the 
pulse waveshaper input. Worked like a charm.

Regards,
Martijn 




From richard at atkinsoft.com  Wed Apr 25 14:32:58 2007
From: richard at atkinsoft.com (Richard Atkinson)
Date: Wed, 25 Apr 2007 13:32:58 +0100
Subject: [sdiy] Yamaha SY-2
In-Reply-To: <002701c78731$a803b130$0100000a@m>
References: <fcbfde580704240956g13163a5al3550a6d4df06e308@mail.gmail.com>
	<462E49D2.9040603@virgin.net>
	<fcbfde580704250423l300e71advbb9b511edd260107@mail.gmail.com>
	<002701c78731$a803b130$0100000a@m>
Message-ID: <fcbfde580704250532u3c33cf8dr766b0930b35b899a@mail.gmail.com>

Hi Martijn,

Very interesting! I'm told that if you leave it on for too long
(around 20 minutes), the pulse width control stops working, and all
the presets that use pulse control (around a third of them) stop
working. All works fine for the first 20 minutes you have it on, then
you can just let it cool back down, or use the other 2/3rds of the
presets.

My main plan for this synthesizer involves replacing one of the
presets with variable controls. The service manual gives full details
of the resistor/diode matrix for the presets. By replacing one row of
these with switches, diodes and variable resistors, I hope I can get a
fully variable SY-2 sound.

Richard

On 4/25/07, Synthusiast <synthusiast at gmx.net> wrote:
> >Hopefully the problem with the pulse wave output will turn out to be in the
> >external components and not in the epoxied modules!
>
> Interesting. I had a SY-2 here a few weeks back with the same problem. It
> turned out that the offset of the sawtooth output (from the epoxied
> module...) was several volts high. This caused the pulse waveshaper, that
> runs on the sawtooth output, to stop functioning. The offset couldn't be
> trimmed away, so I put a small capacitor between the sawtooth output and the
> pulse waveshaper input. Worked like a charm.
>
> Regards,
> Martijn
>
>
>


From jonathan_science at hotmail.com  Wed Apr 25 18:39:59 2007
From: jonathan_science at hotmail.com (J P)
Date: Wed, 25 Apr 2007 12:39:59 -0400
Subject: [sdiy] DIY Drum Machine.
Message-ID: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>

Hi Diddly Ho...

I'm just finishing up my x0xb0x and am thinking...  I am going to need a 
drum machine to go with this badboy.

I'm aware someone came out with that 9090 thingy, but it doesn't have an 
integral sequencer.

Does anyone know of a kit to build a DIY drum machine?  Even something 
simple, maybe four dope sounds (or four wierd glitchy sounds) and a four 
track trigger sequencer...

I might consider building a MIDIBOX sequencer as a THIRD project.  I feel 
pretty good right now about my PCB soldering after my easy going on this 
x0xb0x and I'd like to ride that into something else that's pretty easy and 
tackle something a bit more challenging after that...

Jonathan

_________________________________________________________________
Mortgage refinance is Hot. *Terms. Get a 5.375%* fix rate. Check savings 
https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h2bbb&disc=y&vers=925&s=4056&p=5117



From ajhuovil at cc.hut.fi  Wed Apr 25 19:08:43 2007
From: ajhuovil at cc.hut.fi (Antti Huovilainen)
Date: Wed, 25 Apr 2007 20:08:43 +0300 (EEST)
Subject: [sdiy] DIY Drum Machine.
In-Reply-To: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
Message-ID: <Pine.GSO.4.64.0704252007200.12289@vipunen.hut.fi>

On Wed, 25 Apr 2007, J P wrote:

> Does anyone know of a kit to build a DIY drum machine?  Even something 
> simple, maybe four dope sounds (or four wierd glitchy sounds) and a four 
> track trigger sequencer...

AVR, 256kb flash rom and a simple 12 bit dual DAC.
No kit but 90% of the work is in the front panel / case anyway.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova


From resonant at hoohahrecords.com  Wed Apr 25 19:13:27 2007
From: resonant at hoohahrecords.com (Dave Magnuson)
Date: Wed, 25 Apr 2007 13:13:27 -0400
Subject: [sdiy] DIY Drum Machine.
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
Message-ID: <003001c7875d$0b11e960$947ba8c0@HypoLuxa>

Hi Jonathan,

I don't know of any full drum machine kits, but you could probably cobble 
one together from multiple sources.   The sequencer may be the hardest part 
to find... but a TR-707 or other drum machine and a gate interface should 
work well.

Heck, an Alesis MMT-8 + gate interface would be a great choice as well. 
There might even be enough space inside the case to add the MIDI->gate 
internally.   The 8 tracks on an MMT-8 and an 8 channel interface would make 
a nice pair.

For actual drum voices, two places pop immediately into mind:

Paia makes the "drum tone board" and the "MIDI drum brain"
Ken Stone (http://www.cgs.synth.net/)  has some drum module circuit boards

and if you get ambitious, cloning voices from the DR-110 / DR-55 / TR-606, 
etc is fun and not very complicated

Dave Magnuson


----- Original Message ----- 
From: "J P" <jonathan_science at hotmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, April 25, 2007 12:39 PM
Subject: [sdiy] DIY Drum Machine.


> Hi Diddly Ho...
>
> I'm just finishing up my x0xb0x and am thinking...  I am going to need a 
> drum machine to go with this badboy.
>
> I'm aware someone came out with that 9090 thingy, but it doesn't have an 
> integral sequencer.
>
> Does anyone know of a kit to build a DIY drum machine?  Even something 
> simple, maybe four dope sounds (or four wierd glitchy sounds) and a four 
> track trigger sequencer...
>
> I might consider building a MIDIBOX sequencer as a THIRD project.  I feel 
> pretty good right now about my PCB soldering after my easy going on this 
> x0xb0x and I'd like to ride that into something else that's pretty easy 
> and tackle something a bit more challenging after that...
>
> Jonathan
>
> _________________________________________________________________
> Mortgage refinance is Hot. *Terms. Get a 5.375%* fix rate. Check savings 
> https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h2bbb&disc=y&vers=925&s=4056&p=5117
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 



From houshu at muj.biglobe.ne.jp  Wed Apr 25 19:17:24 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Thu, 26 Apr 2007 02:17:24 +0900 (JST)
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <20070426.021724.553905275507482.houshu@muj.biglobe.ne.jp>

Hello Nils,

Thank you very much for reporting the experimental results.
I'm very happy to see that my schematics have inspired someone.

Sam Hoshuyama
Saitama, JAPAN

From: np <np at planetarc.de>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: 2007/04/25 17:23:19
> Thanks everyone for answering. Now I got the idea why it works.
> 
> I've done a plot of the base voltage vs. the output of my differential 
> amplifier. The circuit wasn't trimmed, and my differential amplifier is 
> inverting so the curve is mirrored. You can estimate the amount of 
> distortion based on the base voltage drive though:
> 
> http://torus.untergrund.net/vca_improved_trace.gif
> 
> Regarding noise: My primary source of noise is hum and rf stray-ins. I 
> doubt that the extra np-connection will contribute that much, but beeing 
> able to drive the base harder was a win SNR-wise. At least for me.
> 
> Nils
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From houshu at muj.biglobe.ne.jp  Wed Apr 25 19:29:12 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Thu, 26 Apr 2007 02:29:12 +0900 (JST)
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <20070426.022912.832528258535699.houshu@muj.biglobe.ne.jp>

Hello Aaron,

Actually, what I saw the circuit topology was a patent 
application (In Japan, almost all the patent applications 
becomes public after one and a half years.) not a filed patent.

A couple of years ago, I saw the same structure in a 
Japanese electronics book published in 80's.
I guess, the structure was not patented.

Best,

Sam Hoshuyama
Saitama, JAPAN

From: Aaron Lanterman <lanterma at ece.gatech.edu>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: 2007/04/25 07:46:47
> 
> On Tue, 24 Apr 2007, np wrote:
> 
> > http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif
> >
> > It's a long tailed pair with two extra transistors working as diodes. Not the 
> > same configuration as the linearization diodes we have in some OTA's. I gave
> 
> Anybody seen the patent this is based on?
> 
> - Aaron
> 
> -----------------------------------------------------------------------------
> 
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From lanterma at ece.gatech.edu  Wed Apr 25 20:28:30 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Wed, 25 Apr 2007 14:28:30 -0400 (EDT)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <20070426.022912.832528258535699.houshu@muj.biglobe.ne.jp>
References: <20070426.022912.832528258535699.houshu@muj.biglobe.ne.jp>
Message-ID: <Pine.GSO.4.60.0704251428110.2230@bigzilla.ece.gatech.edu>


On Thu, 26 Apr 2007, HOSHUYAMA wrote:

> Actually, what I saw the circuit topology was a patent application (In 
> Japan, almost all the patent applications becomes public after one and a 
> half years.) not a filed patent.
>
> A couple of years ago, I saw the same structure in a Japanese 
> electronics book published in 80's. I guess, the structure was not 
> patented.

Interesting! Thanks!

- Aaron

-----------------------------------------------------------------------------

Dr. Aaron Lanterman, Asst. Prof.
and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
College of Electri. and Comp. Eng.   Fax:    404-894-8363
Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
Atlanta, GA 30332                    Office: Centergy 5212



From cfmd at bredband.net  Wed Apr 25 20:51:44 2007
From: cfmd at bredband.net (Magnus Danielson)
Date: Wed, 25 Apr 2007 20:51:44 +0200 (CEST)
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <20070426.021724.553905275507482.houshu@muj.biglobe.ne.jp>
References: <20070426.021724.553905275507482.houshu@muj.biglobe.ne.jp>
Message-ID: <20070425.205144.160805858.cfmd@bredband.net>

From: "HOSHUYAMA" <houshu at muj.biglobe.ne.jp>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: Thu, 26 Apr 2007 02:17:24 +0900 (JST)
Message-ID: <20070426.021724.553905275507482.houshu at muj.biglobe.ne.jp>

> Hello Nils,

Hi Sam,

> Thank you very much for reporting the experimental results.
> I'm very happy to see that my schematics have inspired someone.

It is certainly not the first time!

Cheers,
Magnus


From jmahoney at gate.net  Wed Apr 25 21:30:52 2007
From: jmahoney at gate.net (John Mahoney)
Date: Wed, 25 Apr 2007 15:30:52 -0400
Subject: [sdiy] DIY Drum Machine.
In-Reply-To: <003001c7875d$0b11e960$947ba8c0@HypoLuxa>
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
	<003001c7875d$0b11e960$947ba8c0@HypoLuxa>
Message-ID: <20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>

At 01:13 PM 4/25/2007, Dave Magnuson wrote:
>...
>For actual drum voices, two places pop immediately into mind:
>...
>Dave Magnuson

And (shameless plug), Thomas Henry's Drum Cookbook contains analog 
drum voice circuits:
         http://www.magsmoke.com/thomas_henry_drum_cookbook.asp
--
john


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date: 4/24/2007 5:43 PM




From jason at redfish.net  Wed Apr 25 21:45:50 2007
From: jason at redfish.net (Jason Proctor)
Date: Wed, 25 Apr 2007 12:45:50 -0700
Subject: [sdiy] DIY Drum Machine.
In-Reply-To: <20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
	<003001c7875d$0b11e960$947ba8c0@HypoLuxa>
	<20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>
Message-ID: <a0620076fc2555fbcd957@[10.0.1.203]>

there's that MFB (?) 808-style sequencer that was shown at Messe

http://www.mfberlin.de/Produkte/Module/SEQ-01/SEQ-01e/seq-01e.html

another option is a modded 606

the CGS Cynare ($150 kit from Bride Chamber!!) and other CGS drum 
simulators are cost-effective voices.



From resonant at hoohahrecords.com  Wed Apr 25 21:48:39 2007
From: resonant at hoohahrecords.com (Dave Magnuson)
Date: Wed, 25 Apr 2007 15:48:39 -0400
Subject: [sdiy] DIY Drum Machine.
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl><003001c7875d$0b11e960$947ba8c0@HypoLuxa>
	<20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>
Message-ID: <004301c78772$bacdf5f0$947ba8c0@HypoLuxa>


----- Original Message ----- 
From: "John Mahoney" <jmahoney at gate.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, April 25, 2007 3:30 PM
Subject: Re: [sdiy] DIY Drum Machine.


> At 01:13 PM 4/25/2007, Dave Magnuson wrote:
>>...
>>For actual drum voices, two places pop immediately into mind:
>>...
>>Dave Magnuson
>
> And (shameless plug), Thomas Henry's Drum Cookbook contains analog drum 
> voice circuits:
>         http://www.magsmoke.com/thomas_henry_drum_cookbook.asp
> --
> john


Sorry about forgetting you John!   I actually have circuit boards from 
Midwest Analog Products, and didn't mention them since MAP is gone.... I 
forgot the E-Drum cookbook is still around.  I own a tattered old 
spiral-bound copy and recommend it for anyone new to drum ciruits

Dave 



From seb at burnit.co.uk  Wed Apr 25 22:19:27 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Wed, 25 Apr 2007 21:19:27 +0100
Subject: [sdiy] DIY Drum Machine.
In-Reply-To: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
Message-ID: <462FB7CF.1010208@burnit.co.uk>

Well, a couple of analog drum sounds that are on my list to build are:
http://m.bareille.free.fr/ds7clone/ds7.htm
http://m.bareille.free.fr/ds7clone/ds8.htm

And also, the Thomas Henry's Drum Cookbook that John mentioned.

Personally I've gone the MIDI sequencer route for triggering my analog 
drums.  This is my almost complete DrumBox (will be complete when I get 
round to building the above)...
http://burnit.co.uk/sdiy/index.php?page=drumbox

Seb



J P wrote:
> Hi Diddly Ho...
>
> I'm just finishing up my x0xb0x and am thinking...  I am going to need 
> a drum machine to go with this badboy.
>
> I'm aware someone came out with that 9090 thingy, but it doesn't have 
> an integral sequencer.
>
> Does anyone know of a kit to build a DIY drum machine?  Even something 
> simple, maybe four dope sounds (or four wierd glitchy sounds) and a 
> four track trigger sequencer...
>
> I might consider building a MIDIBOX sequencer as a THIRD project.  I 
> feel pretty good right now about my PCB soldering after my easy going 
> on this x0xb0x and I'd like to ride that into something else that's 
> pretty easy and tackle something a bit more challenging after that...
>
> Jonathan
>
> _________________________________________________________________
> Mortgage refinance is Hot. *Terms. Get a 5.375%* fix rate. Check 
> savings 
> https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h2bbb&disc=y&vers=925&s=4056&p=5117 
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From seb at burnit.co.uk  Thu Apr 26 00:01:09 2007
From: seb at burnit.co.uk (Seb Francis)
Date: Wed, 25 Apr 2007 23:01:09 +0100
Subject: [Fwd: Re: [sdiy] DIY Drum Machine.]
Message-ID: <462FCFA5.9080701@burnit.co.uk>

Meant for the list I think..

-------- Original Message --------
Subject: 	Re: [sdiy] DIY Drum Machine.
Date: 	Wed, 25 Apr 2007 23:50:21 +0200
From: 	mikael altemark <maltemark at gmail.com>
To: 	Seb Francis <seb at burnit.co.uk>
References: 	<BAY111-F2240332E4BD80A52036E51FD490 at phx.gbl> 
<462FB7CF.1010208 at burnit.co.uk>



How about the ongoing MB-808 midibox/TR-808 clone project?
http://eight-oh-eight.org/phpbb2/index.php

Currently waiting list, with the first batch waiting for (almost) complete kit

--
Mikael Altemark

On 4/25/07, Seb Francis <seb at burnit.co.uk> wrote:
> Well, a couple of analog drum sounds that are on my list to build are:
> http://m.bareille.free.fr/ds7clone/ds7.htm
> http://m.bareille.free.fr/ds7clone/ds8.htm
>
> And also, the Thomas Henry's Drum Cookbook that John mentioned.
>
> Personally I've gone the MIDI sequencer route for triggering my analog
> drums.  This is my almost complete DrumBox (will be complete when I get
> round to building the above)...
> http://burnit.co.uk/sdiy/index.php?page=drumbox
>
> Seb
>
>
>
> J P wrote:
> > Hi Diddly Ho...
> >
> > I'm just finishing up my x0xb0x and am thinking...  I am going to need
> > a drum machine to go with this badboy.
> >
> > I'm aware someone came out with that 9090 thingy, but it doesn't have
> > an integral sequencer.
> >
> > Does anyone know of a kit to build a DIY drum machine?  Even something
> > simple, maybe four dope sounds (or four wierd glitchy sounds) and a
> > four track trigger sequencer...
> >
> > I might consider building a MIDIBOX sequencer as a THIRD project.  I
> > feel pretty good right now about my PCB soldering after my easy going
> > on this x0xb0x and I'd like to ride that into something else that's
> > pretty easy and tackle something a bit more challenging after that...
> >
> > Jonathan
> >
> > _________________________________________________________________
> > Mortgage refinance is Hot. *Terms. Get a 5.375%* fix rate. Check
> > savings
> > https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search=mortgage_text_links_88_h2bbb&disc=y&vers=925&s=4056&p=5117
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>




From Stromeko at Compuserve.DE  Thu Apr 26 00:08:18 2007
From: Stromeko at Compuserve.DE (ASSI)
Date: Thu, 26 Apr 2007 00:08:18 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <001001c7870b$c36ed880$0200a8c0@jhsilent>
References: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent>
	<20070425.022145.1910046134.cfmd@bredband.net>
	<001001c7870b$c36ed880$0200a8c0@jhsilent>
Message-ID: <200704260008.18810.Stromeko@Compuserve.DE>

On Mittwoch, 25. April 2007 09:31, JH. wrote:
[...]

The schematic clearly says "6dB input dynamic range improvement" (which 
it clearly does) and not SNR improvement.  Your derivation of a 3dB SNR 
improvement looks fine to me, so both figures are correct.


Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk]>+

Factory and User Sound Singles for Waldorf Q, microQ and rackAttack:
http://Synth.Stromeko.net/Downloads.html#WaldorfSounds



From BJB at dolby.com  Thu Apr 26 00:29:55 2007
From: BJB at dolby.com (Brett, Bill)
Date: Wed, 25 Apr 2007 15:29:55 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <6B16794FD98610449F66759BBF503D40557E45@wdscexbe03.sc.wdc.com>
Message-ID: <05BB196AB3DA6C4BBE11AB6C957581FEA6104C@sfo-exch-01.dolby.net>

I went last year and recommend it to anyone who likes to take the lid
off and tinker. Lot's of interesting creations, projects and people.
However, I did not see one thing related to DIY synths. Surprising since
there has always been such a strong community of folks into such
endeavors. Maybe this year synth DIY will represent!

-Bill 

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Barry Klein
Sent: Monday, April 23, 2007 4:12 PM
To: Synth DIY
Subject: [sdiy] Make Faire

Did anyone on the list go to the Make Faire in San Mateo last year?
Another one is coming up next month.  Looks to be quite interesting but
they don't give a schedule so I do not know if all goes on at the
fairgrounds or some offsite - and how late it goes to.  I'd be flying up
for either one day or both.

Barry


_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
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This message (including any attachments) may contain confidential
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From jason at redfish.net  Thu Apr 26 00:58:01 2007
From: jason at redfish.net (Jason Proctor)
Date: Wed, 25 Apr 2007 15:58:01 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <05BB196AB3DA6C4BBE11AB6C957581FEA6104C@sfo-exch-01.dolby.net>
References: <05BB196AB3DA6C4BBE11AB6C957581FEA6104C@sfo-exch-01.dolby.net>
Message-ID: <a06200708c2558d3180e3@[10.0.1.203]>

ISTR the only synth-related stuff was Lady Ada with the x0xb0x 
amongst other odd creations.

still the faire is jolly good nerdy fun even without anything 
directly synthy involved.

>I went last year and recommend it to anyone who likes to take the lid
>off and tinker. Lot's of interesting creations, projects and people.
>However, I did not see one thing related to DIY synths. Surprising since
>there has always been such a strong community of folks into such
>endeavors. Maybe this year synth DIY will represent!
>
>-Bill



From johannes.oberg at gmail.com  Thu Apr 26 01:20:16 2007
From: johannes.oberg at gmail.com (=?ISO-8859-1?Q?Johannes_=D6berg?=)
Date: Thu, 26 Apr 2007 01:20:16 +0200
Subject: [sdiy] NE545B datasheet (Dolby C NR chip)
Message-ID: <be546e560704251620p9a28e1bu50db061092f6e27f@mail.gmail.com>

I guess the subject line says it all... I have a pair of Dolby C (?)
noise reduction chips and need some info, at least pinout. Anybody?
I've googled like crazy but to no avail. Is there any other name for
this chip?


From jhaible at debitel.net  Thu Apr 26 01:56:05 2007
From: jhaible at debitel.net (JH.)
Date: Thu, 26 Apr 2007 01:56:05 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <001d01c786c1$47d2b5b0$0200a8c0@jhsilent><20070425.022145.1910046134.cfmd@bredband.net><001001c7870b$c36ed880$0200a8c0@jhsilent>
	<200704260008.18810.Stromeko@Compuserve.DE>
Message-ID: <000b01c78795$5383c550$0200a8c0@jhsilent>

>The schematic clearly says "6dB input dynamic range improvement" (which
>it clearly does) and not SNR improvement.  Your derivation of a 3dB SNR
>improvement looks fine to me, so both figures are correct.

Isn't dynamic range the span between a maximum level (clipping point, or a 
certain amount of THD), and the noise floor?

The maximum level is raised by 6dB, and the noise floor is raised by 3dB, 
resulting in 3dB improovement.

JH.



From Brett.Maddaford at mailus.com.au  Thu Apr 26 02:52:21 2007
From: Brett.Maddaford at mailus.com.au (Brett Maddaford)
Date: Thu, 26 Apr 2007 10:52:21 +1000
Subject: [Fwd: Re: [sdiy] DIY Drum Machine.]
Message-ID: <C802AE4E7C88FA4EB8803059B997200D0475B8D3@CARLEMAIL01>

Ken stone has some DIY modules you could put together into a machine
www.cgs.synth.net 

I cant think of anything with a sequencer but someone did mention the tr707
which is what im planning on using with my tr9090....when its finished ;)

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Seb Francis
Sent: Thursday, 26 April 2007 08:01 
To: Synth DIY
Subject: [Fwd: Re: [sdiy] DIY Drum Machine.]

Meant for the list I think..

-------- Original Message --------
Subject: 	Re: [sdiy] DIY Drum Machine.
Date: 	Wed, 25 Apr 2007 23:50:21 +0200
From: 	mikael altemark <maltemark at gmail.com>
To: 	Seb Francis <seb at burnit.co.uk>
References: 	<BAY111-F2240332E4BD80A52036E51FD490 at phx.gbl> 
<462FB7CF.1010208 at burnit.co.uk>



How about the ongoing MB-808 midibox/TR-808 clone project?
http://eight-oh-eight.org/phpbb2/index.php

Currently waiting list, with the first batch waiting for (almost) complete
kit

--
Mikael Altemark

On 4/25/07, Seb Francis <seb at burnit.co.uk> wrote:
> Well, a couple of analog drum sounds that are on my list to build are:
> http://m.bareille.free.fr/ds7clone/ds7.htm
> http://m.bareille.free.fr/ds7clone/ds8.htm
>
> And also, the Thomas Henry's Drum Cookbook that John mentioned.
>
> Personally I've gone the MIDI sequencer route for triggering my analog
> drums.  This is my almost complete DrumBox (will be complete when I get
> round to building the above)...
> http://burnit.co.uk/sdiy/index.php?page=drumbox
>
> Seb
>
>
>
> J P wrote:
> > Hi Diddly Ho...
> >
> > I'm just finishing up my x0xb0x and am thinking...  I am going to need
> > a drum machine to go with this badboy.
> >
> > I'm aware someone came out with that 9090 thingy, but it doesn't have
> > an integral sequencer.
> >
> > Does anyone know of a kit to build a DIY drum machine?  Even something
> > simple, maybe four dope sounds (or four wierd glitchy sounds) and a
> > four track trigger sequencer...
> >
> > I might consider building a MIDIBOX sequencer as a THIRD project.  I
> > feel pretty good right now about my PCB soldering after my easy going
> > on this x0xb0x and I'd like to ride that into something else that's
> > pretty easy and tackle something a bit more challenging after that...
> >
> > Jonathan
> >
> > _________________________________________________________________
> > Mortgage refinance is Hot. *Terms. Get a 5.375%* fix rate. Check
> > savings
> >
https://www2.nextag.com/goto.jsp?product=100000035&url=%2fst.jsp&tm=y&search
=mortgage_text_links_88_h2bbb&disc=y&vers=925&s=4056&p=5117
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at dropmix.xs4all.nl
> > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


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From xyzzy at sysabend.org  Thu Apr 26 03:03:03 2007
From: xyzzy at sysabend.org (Tom Arnold)
Date: Wed, 25 Apr 2007 18:03:03 -0700
Subject: [sdiy] Make Faire
In-Reply-To: <a06200708c2558d3180e3@[10.0.1.203]>
References: <05BB196AB3DA6C4BBE11AB6C957581FEA6104C@sfo-exch-01.dolby.net>
	<a06200708c2558d3180e3@[10.0.1.203]>
Message-ID: <20070426010303.GG47569@moo.sysabend.org>

On Wed, Apr 25, 2007 at 03:58:01PM -0700, Jason Proctor wrote:
> ISTR the only synth-related stuff was Lady Ada with the x0xb0x 
> amongst other odd creations.
> 
> still the faire is jolly good nerdy fun even without anything 
> directly synthy involved.

There *was* the sound-creating-thing in front of the main entrance outside,
if I remember it was some video camera controlled synth setup thing or other
that you always see performance artist types playing with, so I didnt spent
too much time on it, but it was there.

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -
 - BBD Fanatic      -  "...is it a virus, a drug, or a religion?" 
 - echo evho wjxo   -    Juanita Shrugs. "What's the difference?" 
 --------------------  



From controlvoltage at gmail.com  Thu Apr 26 06:44:33 2007
From: controlvoltage at gmail.com (Amos)
Date: Thu, 26 Apr 2007 00:44:33 -0400
Subject: [sdiy] DIY Drum Machine.
In-Reply-To: <20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>
References: <BAY111-F2240332E4BD80A52036E51FD490@phx.gbl>
	<003001c7875d$0b11e960$947ba8c0@HypoLuxa>
	<20070425193040.DWBQ12635.ibm65aec.bellsouth.net@VAIO.gate.net>
Message-ID: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>

My Drum Cookbook is currently on loan but I have every intention of
building up some of those circuits... can anyone who has done so weigh
in with some opinions about the resulting sounds?  Are they meaty,
beaty, big and/or bouncy?  Any subjective descriptions would be nice,
so as to have an idea what to expect.

Cheers!

-Amos

On 4/25/07, John Mahoney <jmahoney at gate.net> wrote:
> At 01:13 PM 4/25/2007, Dave Magnuson wrote:
> >...
> >For actual drum voices, two places pop immediately into mind:
> >...
> >Dave Magnuson
>
> And (shameless plug), Thomas Henry's Drum Cookbook contains analog
> drum voice circuits:
>          http://www.magsmoke.com/thomas_henry_drum_cookbook.asp
> --
> john
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.463 / Virus Database: 269.6.0/775 - Release Date: 4/24/2007 5:43 PM
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From lenham at clara.co.uk  Thu Apr 26 10:43:17 2007
From: lenham at clara.co.uk (Steve Lenham)
Date: Thu, 26 Apr 2007 09:43:17 +0100
Subject: [sdiy] OBX trimming (was Polyphonic tonal disorder!)
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
	<20070419161410.ZTSY27044.ibm64aec.bellsouth.net@VAIO.gate.net>
	<030101c7831f$b2cea360$0202a8c0@DELL>
	<20070424024911.IVFR8957.ibm58aec.bellsouth.net@VAIO.gate.net>
Message-ID: <005601c787de$efb64da0$0202a8c0@DELL>

>>You're right - the only trimming on the OBX filter is scale and offset for 
>>the cutoff frequency.
>
> It can't be too hard to add a resonance trimmer to each voice card, can 
> it?

No, it isn't. The resonance control voltage (pin E7 on each voice card) is 
converted to a current by a 10K resistor. This current flows via a 
grounded-base transistor into the control pin of the resonance control 
'3080.

I would have thought that swapping that resistor (Oberheim don't give them 
numbers!) for a lower value resistor in series with a preset (say 7K5 fixed 
+ 5K preset, giving +/-25% adjustment) would do the trick.

HTH,

Steve L. 



From Peter.Ullrich at kapsch.net  Thu Apr 26 13:14:42 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Thu, 26 Apr 2007 13:14:42 +0200
Subject: AW: [sdiy] NE545B datasheet (Dolby C NR chip)
In-Reply-To: <be546e560704251620p9a28e1bu50db061092f6e27f@mail.gmail.com>
Message-ID: <9CD8492A66A7044FA79781634DD9398501FABF8F@S060VS01.kapsch.co.at>

>I guess the subject line says it all... I have a pair of Dolby C (?) noise 
>reduction chips and need some info, at least pinout. Anybody?
>I've googled like crazy but to no avail. Is there any other name for this chip?


Not an easy part to find a datasheet...

Some pages say that the LM1011 is the equivalent part.
And another site says that the NJE2003 is an equivalent for the LM1011.
And there is a datasheet for the HJE2003:

http://www.nteinc.com/specs/2000to2099/pdf/nte2003.pdf

So maybe this datasheet can help you...

Ciao
Peter 

--
Peter Ullrich I Hardware Engineer, Research & Development 
Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net

Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
http://www.kapschtraffic.com/ I http://www.kapsch.net/
Registered at Commercial Court in Vienna FN223805a
Registered Office Vienna


The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From Peter.Ullrich at kapsch.net  Thu Apr 26 14:13:40 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Thu, 26 Apr 2007 14:13:40 +0200
Subject: AW: [sdiy] NE545B datasheet (Dolby C NR chip)
In-Reply-To: <9CD8492A66A7044FA79781634DD9398501FABF8F@S060VS01.kapsch.co.at>
Message-ID: <9CD8492A66A7044FA79781634DD9398501FABFE1@S060VS01.kapsch.co.at>

 Sorry for my typos... NTE2003 is the name of the chip...


--
Peter Ullrich I Hardware Engineer, Research & Development 
Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net

Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
http://www.kapschtraffic.com/ I http://www.kapsch.net/
Registered at Commercial Court in Vienna FN223805a
Registered Office Vienna

-----Urspr?ngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Ullrich Peter
Gesendet: Donnerstag, 26. April 2007 13:15
An: Johannes ?berg; synth-diy at dropmix.xs4all.nl
Betreff: AW: [sdiy] NE545B datasheet (Dolby C NR chip)

>I guess the subject line says it all... I have a pair of Dolby C (?) 
>noise reduction chips and need some info, at least pinout. Anybody?
>I've googled like crazy but to no avail. Is there any other name for this chip?


Not an easy part to find a datasheet...

Some pages say that the LM1011 is the equivalent part.
And another site says that the NJE2003 is an equivalent for the LM1011.
And there is a datasheet for the HJE2003:

http://www.nteinc.com/specs/2000to2099/pdf/nte2003.pdf

So maybe this datasheet can help you...

Ciao
Peter 

The information contained in this e-mail message is privileged and
confidential and is for the exclusive use of the addressee. The person
who receives this message and who is not the addressee, one of his
employees or an agent entitled to hand it over to the addressee, is
informed that he may not use, disclose or reproduce the contents thereof.




From julian at 22host24.com  Thu Apr 26 15:07:28 2007
From: julian at 22host24.com (Julian)
Date: Thu, 26 Apr 2007 14:07:28 +0100
Subject: [sdiy] OT - help me ID this USB port?
Message-ID: <Zen-1Hh3h2-0001IA-0N@pythagoras.zen.co.uk>

Im still working on my car stereo, and find that the usb port is not your usual micro 'b' port, but some other, possibly
proprietary, socket.

If I knew what it was, I may have some hope in finding a cable for it.

Theres a photo here - 

http://www.port23.co.uk/usbport.jpg

(the manufacturers don't seem interested in supporting the defunct product line)

Any suggestions?

Thanks, Julian



From Jason.Tribbeck at argogroup.com  Thu Apr 26 15:13:57 2007
From: Jason.Tribbeck at argogroup.com (Jason Tribbeck)
Date: Thu, 26 Apr 2007 14:13:57 +0100
Subject: [sdiy] OT - help me ID this USB port?
In-Reply-To: <Zen-1Hh3h2-0001IA-0N@pythagoras.zen.co.uk>
Message-ID: <E3402731A68AC640A0F8428448C66D9101BE3C7A@sbssrv01.argogroup.local>

Hi,

> Im still working on my car stereo, and find that the usb port 
> is not your usual micro 'b' port, but some other, possibly 
> proprietary, socket.
> 
> If I knew what it was, I may have some hope in finding a cable for it.
> 
> Theres a photo here - 
> 
> http://www.port23.co.uk/usbport.jpg

It's not a common socket, but I had one like this on an MP3 player I was
given, and a colleague of mine had something very similar. However, when
he lost is cable, mine didn't fit because there were some lugs in
slightly the wrong place.

Unfortunately, I don't know where my cable went, so I can't say for
definite whether it would fit or not (I'm not using it any more).
--
Jason Tribbeck



From houshu at muj.biglobe.ne.jp  Thu Apr 26 15:21:10 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Thu, 26 Apr 2007 22:21:10 +0900 (JST)
Subject: [sdiy] NE545B datasheet (Dolby C NR chip)
Message-ID: <20070426.222110.707466233595376.houshu@muj.biglobe.ne.jp>

Hello Johannes,

NE545 is for Dolby B.  (I have some in my parts box.)

If you or your frined can access the following AES paper,
pin connection and an application circuit are shown there.

  http://www.aes.org/e-lib/browse.cfm?elib=2554

I have a copy of the paper, but, don't want to run a risk 
of violating copyright.

Internal circuit is available in a dolby's patent (Pin 
connection is not shown unfortunately):

  http://www.pat2pdf.org/patents/pat4068139.pdf

Sam Hoshuyama
Saitama, JAPAN

From: "Johannes ?erg" <johannes.oberg at gmail.com>
Date: 2007/04/26 08:20:16
> I guess the subject line says it all... I have a pair of Dolby C (?)
> noise reduction chips and need some info, at least pinout. Anybody?
> I've googled like crazy but to no avail. Is there any other name for
> this chip?



From jmahoney at gate.net  Thu Apr 26 15:29:28 2007
From: jmahoney at gate.net (John Mahoney)
Date: Thu, 26 Apr 2007 09:29:28 -0400
Subject: [sdiy] OBX trimming (was Polyphonic tonal disorder!)
In-Reply-To: <005601c787de$efb64da0$0202a8c0@DELL>
References: <953612.5462.qm@web27608.mail.ukl.yahoo.com>
	<02db01c78294$ae7a4d90$0202a8c0@DELL>
	<20070419161410.ZTSY27044.ibm64aec.bellsouth.net@VAIO.gate.net>
	<030101c7831f$b2cea360$0202a8c0@DELL>
	<20070424024911.IVFR8957.ibm58aec.bellsouth.net@VAIO.gate.net>
	<005601c787de$efb64da0$0202a8c0@DELL>
Message-ID: <20070426132916.KOHY21242.ibm59aec.bellsouth.net@VAIO.gate.net>

At 04:43 AM 4/26/2007, Steve Lenham wrote:

>>>You're right - the only trimming on the OBX filter is scale and 
>>>offset for the cutoff frequency.
>>
>>It can't be too hard to add a resonance trimmer to each voice card, can it?
>
>No, it isn't. The resonance control voltage (pin E7 on each voice 
>card) is converted to a current by a 10K resistor. This current 
>flows via a grounded-base transistor into the control pin of the 
>resonance control '3080.
>
>I would have thought that swapping that resistor (Oberheim don't 
>give them numbers!) for a lower value resistor in series with a 
>preset (say 7K5 fixed + 5K preset, giving +/-25% adjustment) would 
>do the trick.
>
>HTH,
>
>Steve L.

Thanks! I'm saving this message for reference, because I just may do this.

While we're on the subject, do you have a favorite replacement 
trimmer for the OB-X?
--
john


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition. 
Version: 7.5.463 / Virus Database: 269.6.1/776 - Release Date: 4/25/2007 12:19 PM




From houshu at muj.biglobe.ne.jp  Thu Apr 26 15:38:20 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Thu, 26 Apr 2007 22:38:20 +0900 (JST)
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <20070426.223820.365776762356723.houshu@muj.biglobe.ne.jp>

Aaron,

What a coincidence!

The dolby's patent shows a variable resistance cell using a differential 
pair with a lot of diodes at the common emitter (Fig. 6).

  http://www.pat2pdf.org/patents/pat4068139.pdf

  An OTA with 100% feedback works as a variable resistor.

It was published in 70's.  So, the Japanese patent application 
can not be patented  ;-)

Sam Hoshuyama
Saitama, JAPAN


From: Aaron Lanterman <lanterma at ece.gatech.edu>
Date: 2007/04/26 03:28:30
> 
> On Thu, 26 Apr 2007, HOSHUYAMA wrote:
> 
> > Actually, what I saw the circuit topology was a patent application (In 
> > Japan, almost all the patent applications becomes public after one and a 
> > half years.) not a filed patent.
> >
> > A couple of years ago, I saw the same structure in a Japanese 
> > electronics book published in 80's. I guess, the structure was not 
> > patented.
> 
> Interesting! Thanks!
> 
> - Aaron
> 
> -----------------------------------------------------------------------------
> 
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
> 
> 


From merlin at merlinzener.com  Thu Apr 26 16:35:07 2007
From: merlin at merlinzener.com (Merlin Zener)
Date: Fri, 27 Apr 2007 00:35:07 +1000
Subject: [sdiy] OT - help me ID this USB port?
In-Reply-To: <E3402731A68AC640A0F8428448C66D9101BE3C7A@sbssrv01.argogroup.local>
References: <Zen-1Hh3h2-0001IA-0N@pythagoras.zen.co.uk>
	<E3402731A68AC640A0F8428448C66D9101BE3C7A@sbssrv01.argogroup.local>
Message-ID: <75c7870a0704260735k1440077bte6bd444b38a431b0@mail.gmail.com>

On 4/26/07, Jason Tribbeck <Jason.Tribbeck at argogroup.com> wrote:
>
> It's not a common socket, but I had one like this on an MP3 player I was
> given, and a colleague of mine had something very similar.

Hi,
I saw that and thought it might have been the same as my iRiver mp3
player. But I went and had a close look, and it's not the same - the
one in the picture has that cutout key bit set offcenter; the iriver
one is symmetrical.


-- 
Merlin Zener
piano, synthesizer.


From harrybissell at copper.net  Thu Apr 26 17:23:05 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Thu, 26 Apr 2007 15:23:05 -0000
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <380-22007442615235212@copper.net>

Checking out the patent (Dolby) and the patents referenced 
in that patent... it looks a lot like the Moog HPF architecture
with added transistors for higher linearity....

They did disclose that 'one' transistor would work...

The main benefit (imho) from the bipolar method is you do not
need a FET. That would be a big benefit to someone with a
monolythic process like Signetics.  Don't need to fabricate
FETs on the chip.

It would be a pain to do discretely, imho

H^) harry



>>pair with a lot of diodes at the common emitter (Fig. 6).
>>
>>  http://www.pat2pdf.org/patents/pat4068139.pdf
>>
>>  An OTA with 100% feedback works as a variable resistor.
>>
>>It was published in 70's.  So, the Japanese patent application 
>>can not be patented  ;-)
>>
>>Sam Hoshuyama
>>Saitama, JAPAN
>>
>>
>>From: Aaron Lanterman <lanterma at ece.gatech.edu>
>>Date: 2007/04/26 03:28:30
>>> 
>>> On Thu, 26 Apr 2007, HOSHUYAMA wrote:
>>> 
>>> > Actually, what I saw the circuit topology was a patent
>application (In 
>>> > Japan, almost all the patent applications becomes public after
>one and a 
>>> > half years.) not a filed patent.
>>> >
>>> > A couple of years ago, I saw the same structure in a Japanese 
>>> > electronics book published in 80's. I guess, the structure was
>not 
>>> > patented.
>>> 
>>> Interesting! Thanks!
>>> 
>>> - Aaron
>>> 
>>>
>---------------------------------------------------------------------
>--------
>>> 
>>> Dr. Aaron Lanterman, Asst. Prof.
>>> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
>>> College of Electri. and Comp. Eng.   Fax:    404-894-8363
>>> Georgia Institute of Technology      E-mail:
>lanterma at ece.gatech.edu
>>> Mail Code 0250                       Web:   
>users.ece.gatech.edu/~lanterma
>>> Atlanta, GA 30332                    Office: Centergy 5212
>>> 
>>> 
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From houshu at muj.biglobe.ne.jp  Thu Apr 26 18:05:00 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Fri, 27 Apr 2007 01:05:00 +0900 (JST)
Subject: [sdiy] NE545B datasheet (Dolby C NR chip)
Message-ID: <20070427.010459.618920370751354.houshu@muj.biglobe.ne.jp>

Hello Johannes,

I'm sorry for the wrong information.

The patent is not for NE545.
It reffers NE545 as a conventional method.

Sam Hoshuyama


From: "HOSHUYAMA" <houshu at muj.biglobe.ne.jp>
Date: 2007/04/26 22:21:10
> Hello Johannes,
> 
> NE545 is for Dolby B.  (I have some in my parts box.)
> 
> If you or your frined can access the following AES paper,
> pin connection and an application circuit are shown there.
> 
>   http://www.aes.org/e-lib/browse.cfm?elib=2554
> 
> I have a copy of the paper, but, don't want to run a risk 
> of violating copyright.
> 
> Internal circuit is available in a dolby's patent (Pin 
> connection is not shown unfortunately):
> 
>   http://www.pat2pdf.org/patents/pat4068139.pdf
> 
> Sam Hoshuyama
> Saitama, JAPAN
> 
> From: "Johannes ?erg" <johannes.oberg at gmail.com>
> Date: 2007/04/26 08:20:16
> > I guess the subject line says it all... I have a pair of Dolby C (?)
> > noise reduction chips and need some info, at least pinout. Anybody?
> > I've googled like crazy but to no avail. Is there any other name for
> > this chip?
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 


From ladyada at mit.edu  Thu Apr 26 18:29:16 2007
From: ladyada at mit.edu (limor)
Date: Thu, 26 Apr 2007 12:29:16 -0400
Subject: [sdiy] Make Faire
In-Reply-To: <20070426010303.GG47569@moo.sysabend.org>
References: <05BB196AB3DA6C4BBE11AB6C957581FEA6104C@sfo-exch-01.dolby.net>
	<a06200708c2558d3180e3@10.0.1.203>
	<20070426010303.GG47569@moo.sysabend.org>
Message-ID: <e06100850704260929u205629e0oe83a2bd80ddcdae1@mail.gmail.com>

i was there with my DIY synth, although most busy running workshops
during the day...

there was also Lucy's fire-organ:
http://www.flickr.com/photos/67212010 at N00/135215417/

and the ThimbleTron, which was enthusiastically demo'd every day
http://evolution-control.com/thimbletron.html

& probably other things i cant remember

every year there is a call for proposals, and there's one in late
october in TX so if you're interested in presenting, its quite easy to
apply.
http://makerfaire.com/bayarea/2007/proposal/

 limor


From rdrake at data2action.com  Thu Apr 26 19:05:18 2007
From: rdrake at data2action.com (rdrake)
Date: Thu, 26 Apr 2007 13:05:18 -0400
Subject: [sdiy] transistor substitutions for BC108, BC187
Message-ID: <20070426170518.62122.qmail@mmm1113.verio-web.com>

looking at an older circuit from PE magazine, I'm unable to locate transistors BC187 or BC108... anybody know of resonable replacements that are obtainium?  

bbob


From houshu at muj.biglobe.ne.jp  Thu Apr 26 19:21:43 2007
From: houshu at muj.biglobe.ne.jp (HOSHUYAMA)
Date: Fri, 27 Apr 2007 02:21:43 +0900 (JST)
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <20070427.022143.47810264936746.houshu@muj.biglobe.ne.jp>

Hello Harry,

This one?

http://www.pat2pdf.org/patents/pat3761741.pdf

Sam Hoshuyama

From: harrybissell at copper.net
Date: 2007/04/27 00:23:05
> Checking out the patent (Dolby) and the patents referenced 
> in that patent... it looks a lot like the Moog HPF architecture
> with added transistors for higher linearity....
> 
> They did disclose that 'one' transistor would work...
> 
> The main benefit (imho) from the bipolar method is you do not
> need a FET. That would be a big benefit to someone with a
> monolythic process like Signetics.  Don't need to fabricate
> FETs on the chip.
> 
> It would be a pain to do discretely, imho
> 
> H^) harry
> 
> 
> 
> >>pair with a lot of diodes at the common emitter (Fig. 6).
> >>
> >>  http://www.pat2pdf.org/patents/pat4068139.pdf
> >>
> >>  An OTA with 100% feedback works as a variable resistor.
> >>
> >>It was published in 70's.  So, the Japanese patent application 
> >>can not be patented  ;-)
> >>
> >>Sam Hoshuyama
> >>Saitama, JAPAN
> >>
> >>
> >>From: Aaron Lanterman <lanterma at ece.gatech.edu>
> >>Date: 2007/04/26 03:28:30
> >>> 
> >>> On Thu, 26 Apr 2007, HOSHUYAMA wrote:
> >>> 
> >>> > Actually, what I saw the circuit topology was a patent
> >application (In 
> >>> > Japan, almost all the patent applications becomes public after
> >one and a 
> >>> > half years.) not a filed patent.
> >>> >
> >>> > A couple of years ago, I saw the same structure in a Japanese 
> >>> > electronics book published in 80's. I guess, the structure was
> >not 
> >>> > patented.
> >>> 
> >>> Interesting! Thanks!
> >>> 
> >>> - Aaron
> >>> 
> >>>
> >---------------------------------------------------------------------
> >--------
> >>> 
> >>> Dr. Aaron Lanterman, Asst. Prof.
> >>> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> >>> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> >>> Georgia Institute of Technology      E-mail:
> >lanterma at ece.gatech.edu
> >>> Mail Code 0250                       Web:   
> >users.ece.gatech.edu/~lanterma
> >>> Atlanta, GA 30332                    Office: Centergy 5212
> >>> 
> >>> 
> >>_______________________________________________
> >>Synth-diy mailing list
> >>Synth-diy at dropmix.xs4all.nl
> >>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> 


From harrybissell at copper.net  Thu Apr 26 19:39:49 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Thu, 26 Apr 2007 17:39:49 -0000
Subject: [sdiy] improved dynamic range diffpair-vca
Message-ID: <380-220074426173949786@copper.net>

That's the one. Dolby is making an HPF
anyway.  You could do a Moog HPF with this
architecture... but you'd need a LOT of transistors
for a four pole implementation. OTOH it might be able
to hangle quite a large signal that way.

(otoh the HPF is a little boring imho :^)

H^) harry

>
>
>
>---- Original Message ----
>From: houshu at muj.biglobe.ne.jp
>To: harrybissell at copper.net
>Subject: Re: [sdiy] improved dynamic range diffpair-vca
>Date: Fri, 27 Apr 2007 02:21:43 +0900 (JST)
>
>>Hello Harry,
>>
>>This one?
>>
>>http://www.pat2pdf.org/patents/pat3761741.pdf
>>
>>Sam Hoshuyama
>>
>>From: harrybissell at copper.net
>>Date: 2007/04/27 00:23:05
>>> Checking out the patent (Dolby) and the patents referenced 
>>> in that patent... it looks a lot like the Moog HPF architecture
>>> with added transistors for higher linearity....
>>> 
>>> They did disclose that 'one' transistor would work...
>>> 
>>> The main benefit (imho) from the bipolar method is you do not
>>> need a FET. That would be a big benefit to someone with a
>>> monolythic process like Signetics.  Don't need to fabricate
>>> FETs on the chip.
>>> 
>>> It would be a pain to do discretely, imho
>>> 
>>> H^) harry
>>> 
>>> 
>>> 
>>> >>pair with a lot of diodes at the common emitter (Fig. 6).
>>> >>
>>> >>  http://www.pat2pdf.org/patents/pat4068139.pdf
>>> >>
>>> >>  An OTA with 100% feedback works as a variable resistor.
>>> >>
>>> >>It was published in 70's.  So, the Japanese patent application 
>>> >>can not be patented  ;-)
>>> >>
>>> >>Sam Hoshuyama
>>> >>Saitama, JAPAN
>>> >>
>>> >>
>>> >>From: Aaron Lanterman <lanterma at ece.gatech.edu>
>>> >>Date: 2007/04/26 03:28:30
>>> >>> 
>>> >>> On Thu, 26 Apr 2007, HOSHUYAMA wrote:
>>> >>> 
>>> >>> > Actually, what I saw the circuit topology was a patent
>>> >application (In 
>>> >>> > Japan, almost all the patent applications becomes public
>after
>>> >one and a 
>>> >>> > half years.) not a filed patent.
>>> >>> >
>>> >>> > A couple of years ago, I saw the same structure in a
>Japanese 
>>> >>> > electronics book published in 80's. I guess, the structure
>was
>>> >not 
>>> >>> > patented.
>>> >>> 
>>> >>> Interesting! Thanks!
>>> >>> 
>>> >>> - Aaron
>>> >>> 
>>> >>>
>>>
>>--------------------------------------------------------------------
>-
>>> >--------
>>> >>> 
>>> >>> Dr. Aaron Lanterman, Asst. Prof.
>>> >>> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
>>> >>> College of Electri. and Comp. Eng.   Fax:    404-894-8363
>>> >>> Georgia Institute of Technology      E-mail:
>>> >lanterma at ece.gatech.edu
>>> >>> Mail Code 0250                       Web:   
>>> >users.ece.gatech.edu/~lanterma
>>> >>> Atlanta, GA 30332                    Office: Centergy 5212
>>> >>> 
>>> >>> 
>>> >>_______________________________________________
>>> >>Synth-diy mailing list
>>> >>Synth-diy at dropmix.xs4all.nl
>>> >>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>> 
>>> 
>>> 





From mirwin at marketbridge.ca  Thu Apr 26 21:58:50 2007
From: mirwin at marketbridge.ca (Mike I)
Date: Thu, 26 Apr 2007 12:58:50 -0700
Subject: [sdiy] NE545B datasheet (Dolby C NR chip)
References: <20070426.222110.707466233595376.houshu@muj.biglobe.ne.jp>
Message-ID: <004e01c7883d$500f21a0$95dc47d1@u6l7n8>

The NE645 Dolby-B datasheets can be downloaded at www.datasheetarchive.com
and they have specs and application circuit. Don't know how closely related
it is to the NE545...
M.



From dalenkarl at yahoo.se  Thu Apr 26 22:30:10 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Thu, 26 Apr 2007 22:30:10 +0200 (CEST)
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
Message-ID: <20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>

I wonder, they have these car play-the-loudest-championship,
what tone or composite sound frame at which pitch gives the
highest movement of air? Ie dB.


KD



      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From Peter.Ullrich at kapsch.net  Thu Apr 26 22:54:50 2007
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Thu, 26 Apr 2007 22:54:50 +0200
Subject: [sdiy] OT - help me ID this USB port?
References: <Zen-1Hh3h2-0001IA-0N@pythagoras.zen.co.uk><E3402731A68AC640A0F8428448C66D9101BE3C7A@sbssrv01.argogroup.local>
	<75c7870a0704260735k1440077bte6bd444b38a431b0@mail.gmail.com>
Message-ID: <9CD8492A66A7044FA79781634DD93985010F789B@S060VS01.kapsch.co.at>

Maybe it is a micro USB connector?

http://www.smk.co.jp/whatsnew_e/779cs_e.html

Ciao
Peter

        \|/
       (o o)
--oOOO--(_)--OOOo------------------------------------------------------

Peter Ullrich I Hardware Engineer, Research & Development
Phone +43 (0)50 811 2265 I Mobile +43 (0)664 628 2265
eFax +43 (0)50 811 992265 I peter.ullrich at kapsch.net

Kapsch TrafficCom AG I Wagenseilgasse 1 I A-1120 Vienna I Austria
http://www.kapschtraffic.com/ I http://www.kapsch.net/
Registered at Commercial Court in Vienna FN223805a
Registered Office Vienna

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who receives this message and who is not the addressee, one of his
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informed that he may not use, disclose or reproduce the contents thereof.




From tim.parkhurst at gmail.com  Fri Apr 27 00:21:06 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Thu, 26 Apr 2007 15:21:06 -0700
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
References: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
	<20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
Message-ID: <87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>

On 4/26/07, karl dalen <dalenkarl at yahoo.se> wrote:
> I wonder, they have these car play-the-loudest-championship,
> what tone or composite sound frame at which pitch gives the
> highest movement of air? Ie dB.
>
>
> KD
>

I think it would depend on the resonant frequency of the car's
interior. If you could find that frequency, then that would help you
maximize the amount of air movement you would get out of the stereo
system. The response peaks of the stereo system would also pay a key
role. The scientific approach would be to plot the resonant peaks of
the car's interior, overlay those with a graph of the response of the
stereo, find the frequencies where the two plots coincide, and then
look for music with similar frequency peaks.  In practice however, I
think it comes down to "play a bunch of tunes and see what sounds /
feels loudest." Oh, and the tune has to have lots of thumpin' bass.
;-)


Tim (def dumb and blind jam) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From mikael at mikmo.dk  Fri Apr 27 00:22:00 2007
From: mikael at mikmo.dk (=?ISO-8859-1?Q?Mikael M=F8rup?=)
Date: Fri, 27 Apr 2007 00:22:00 +0200
Subject: [sdiy] Transistor score
Message-ID: <20070426222200.7D354168040@webmail2.surf-town.net>


A friend of mine who is working as en electronics tech. at a university lab asked me i i wanted to look at "some old crap" before it was dumped.

In a small cardboard box was a number of littele plastic bags with what i believe is different matched transistor pairs from ancient times.

All of them are metal can transistors with 6 pins, some of them i know, and know are interesting, but i would like to hear if anyone knows if any of these are usefull in a synth context :

MAT 01    probably interesting
MD 7002
2C 415
2V 435
uA 726    probably  interesting , one bag of 10 marked " meassured -  selected" (in danish :-) )
LM 394    probably interesting 
AD 832

Some have date codes from 1974

Would any of these be usabele as substitutes for MAT02 / 04 in synth work ?

Also :

Some AD 136 power (Ge ??) transistors
Some Burr Brown DAC708KH DAC's
a few 2n4302 and 2n4303 transistors (Minimoog ???)

Mikael




From sasami at hotkey.net.au  Fri Apr 27 01:53:17 2007
From: sasami at hotkey.net.au (Ken Stone)
Date: Fri, 27 Apr 2007 09:53:17 +1000 (EST)
Subject: [sdiy] Transistor score
Message-ID: <20070426235317.099BA8BC3DC@mailout2.hotkey.net.au>

Lucky! That's a bag of gold you have there.

Off hand:

>uA 726   Rare as hens teeth. Used in lots of 70s-80s synths. Heated matched
pair.
>LM 394   Good dual NPN. Use as MAT02
>AD 832   popular in electronotes (if I recall correctly).


>MAT 01    probably interesting
>MD 7002
>2C 415
>2V 435
>

_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>



From lanterma at ece.gatech.edu  Fri Apr 27 01:59:21 2007
From: lanterma at ece.gatech.edu (Aaron Lanterman)
Date: Thu, 26 Apr 2007 19:59:21 -0400 (EDT)
Subject: [sdiy] Transistor score
In-Reply-To: <20070426235317.099BA8BC3DC@mailout2.hotkey.net.au>
References: <20070426235317.099BA8BC3DC@mailout2.hotkey.net.au>
Message-ID: <Pine.GSO.4.60.0704261958450.3854@bigzilla.ece.gatech.edu>


On Fri, 27 Apr 2007, Ken Stone wrote:

>> AD 832   popular in electronotes (if I recall correctly).

Maybe shows up in Buchlas? (mabe I'm thinking of the AD811, or uhm, was 
it 881, can't remember now)

- Aaron


From dalenkarl at yahoo.se  Fri Apr 27 03:02:39 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Fri, 27 Apr 2007 03:02:39 +0200 (CEST)
Subject: SV: [sdiy] Transistor score
In-Reply-To: <20070426222200.7D354168040@webmail2.surf-town.net>
Message-ID: <697673.81437.qm@web27604.mail.ukl.yahoo.com>

All of that are very old and not very useful stuff, do not believe what 
other people on this forum tells you, however i can ease your burden
to junk it safely in compliance to the RHOS demands offering to pay
you lets say, 5euro for the lot!

Yes?

In sincere and honest regards.
KD

--- Mikael M?rup <mikael at mikmo.dk> skrev:

> 
> A friend of mine who is working as en electronics tech. at a university lab
> asked me i i wanted to look at "some old crap" before it was dumped.
> 
> In a small cardboard box was a number of littele plastic bags with what i
> believe is different matched transistor pairs from ancient times.
> 
> All of them are metal can transistors with 6 pins, some of them i know, and
> know are interesting, but i would like to hear if anyone knows if any of
> these are usefull in a synth context :
> 
> MAT 01    probably interesting
> MD 7002
> 2C 415
> 2V 435
> uA 726    probably  interesting , one bag of 10 marked " meassured - 
> selected" (in danish :-) )
> LM 394    probably interesting 
> AD 832
> 
> Some have date codes from 1974
> 
> Would any of these be usabele as substitutes for MAT02 / 04 in synth work ?
> 
> Also :
> 
> Some AD 136 power (Ge ??) transistors
> Some Burr Brown DAC708KH DAC's
> a few 2n4302 and 2n4303 transistors (Minimoog ???)
> 
> Mikael
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      __________________________________________________________
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From don at till.com  Fri Apr 27 06:44:09 2007
From: don at till.com (Don Tillman)
Date: Thu, 26 Apr 2007 21:44:09 -0700
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com> (message
	from karl dalen on Thu, 26 Apr 2007 22:30:10 +0200 (CEST))
References: <20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
Message-ID: <m2zm4uctpi.fsf@till.com>

   > Date: Thu, 26 Apr 2007 22:30:10 +0200 (CEST)
   > From: karl dalen <dalenkarl at yahoo.se>
   > 
   > I wonder, they have these car play-the-loudest-championship,
   > what tone or composite sound frame at which pitch gives the
   > highest movement of air? Ie dB.

Mythbuster, Season 4, Episode 69, "Shattering Subwoofer"

Jamie and Adam built a 50-inch subwoofer into a Mercedes 240D, where
the woofer cone was driven by the driveshaft.  It produced 16Hz at a
level of about 161 dB, blowing off the sunroof.  There ya go!

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com


From mikael at mikmo.dk  Fri Apr 27 09:00:31 2007
From: mikael at mikmo.dk (=?ISO-8859-1?Q?Mikael M=F8rup?=)
Date: Fri, 27 Apr 2007 09:00:31 +0200
Subject: SV: [sdiy] Transistor score
Message-ID: <20070427070031.43331168077@webmail2.surf-town.net>

That is a very generous offer, but since these devices are not RHOS compliant selling them to someone outside Europe would probably constitute a violation of serveral laws, rules and regulations, which of course is compleatly against my high moral and ethic standards.

:-)

Mikael


 On Fri Apr 27  3:02 , karl dalen <dalenkarl at yahoo.se> sent:

>All of that are very old and not very useful stuff, do not believe what 
>other people on this forum tells you, however i can ease your burden
>to junk it safely in compliance to the RHOS demands offering to pay
>you lets say, 5euro for the lot!
>
>Yes?
>
>In sincere and honest regards.
>KD
>
>--- Mikael M?rup mikael at mikmo.dk> skrev:
>
>> 
>> A friend of mine who is working as en electronics tech. at a university lab
>> asked me i i wanted to look at "some old crap" before it was dumped.
>> 
>> In a small cardboard box was a number of littele plastic bags with what i
>> believe is different matched transistor pairs from ancient times.
>> 
>> All of them are metal can transistors with 6 pins, some of them i know, and
>> know are interesting, but i would like to hear if anyone knows if any of
>> these are usefull in a synth context :
>> 
>> MAT 01    probably interesting
>> MD 7002
>> 2C 415
>> 2V 435
>> uA 726    probably  interesting , one bag of 10 marked " meassured - 
>> selected" (in danish :-) )
>> LM 394    probably interesting 
>> AD 832
>> 
>> Some have date codes from 1974
>> 
>> Would any of these be usabele as substitutes for MAT02 / 04 in synth work ?
>> 
>> Also :
>> 
>> Some AD 136 power (Ge ??) transistors
>> Some Burr Brown DAC708KH DAC's
>> a few 2n4302 and 2n4303 transistors (Minimoog ???)
>> 
>> Mikael
>> 
>> 
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>> 
>
>
>
>      __________________________________________________________
>Hitta din n?sta resa p? Yahoo! Shopping.
>J?mf?r pris p? flygbiljetter och hotellrum h?r: http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
>)




From tonyallgood at btinternet.com  Fri Apr 27 10:20:15 2007
From: tonyallgood at btinternet.com (Oakley Sound)
Date: Fri, 27 Apr 2007 09:20:15 +0100
Subject: [sdiy] transistor substitutions for BC108, BC187
In-Reply-To: <20070426170518.62122.qmail@mmm1113.verio-web.com>
References: <20070426170518.62122.qmail@mmm1113.verio-web.com>
Message-ID: <4631B23F.6010507@btinternet.com>

The BC548 is the recognised sub for the BC108, but a BC550 will be just 
as good I would have thought.

I think the BC187 is a PNP, but the schematic will confirm this, so it 
could probably be subbed with the BC560.

Pin outs will be different though.

The BC108 was the classic NPN used in loads of hobby projects.

TUP, TUN, DUS, DUG anyone?

Tony

www.oakleysound.com


From sounddoctorin at imt.net  Fri Apr 27 11:03:57 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Fri, 27 Apr 2007 02:03:57 -0700
Subject: [sdiy] ARP axxe popping revisited
Message-ID: <4631BC7D.70406@imt.net>

I pulled this thing up again today.  If anyone has the schematics handy 
and you want to review this fairly simple to describe situation I'd 
appreciate it.  An extra brain would be nice..mine is worn out :-).  To 
review,

1) Signal/noise ration seems pretty bleak and I'm not sure how much 
these things have.  I noted  that part of it was related to wiring near 
the transformer.  However...I came back later and it had no correlation 
and the noise level was a lot lower but still kind of hissy.  Which was 
kind of odd..

2) There is a horrendous popping during envelope transitions.. 

Tonight I looked over the circuitry and found a transistor lead in the 
gating circuitry that had cracked the trace going to Z5...but repairing 
that there was no difference.  But I found that the pop is definitely 
sourcing from the ADSR.  I can see the pop...something like a few tenth 
of a volt 150usec wide triangle that preceeds the envelope's movement, 
on test point 4 and 5.  It was difficult to see on the input of Z7 
though,  but using the listening device, it sounds the same on the input 
pin 3 as on the output of Z7 the last op amp in the adsr.

The signal gets much weaker if you move across either 1K resistor 
connected to that point.  Both resistors measure 1.03K.  The capacitor 
is well within esr spec and the ground is good.  What...in the 
world....   I've replaced the op amp twice now.  I've had so many crazy 
problems like this.... I can't see the pop at all on the power supply 
rails btw.    Any thoughts? -Bob


From profpep at hotmail.com  Fri Apr 27 13:22:04 2007
From: profpep at hotmail.com (Mike)
Date: Fri, 27 Apr 2007 12:22:04 +0100
Subject: [sdiy] transistor substitutions for BC108, BC187
References: <20070426170518.62122.qmail@mmm1113.verio-web.com>
	<4631B23F.6010507@btinternet.com>
Message-ID: <BAY133-DAV1E6CBA5F4A252B4424984A14F0@phx.gbl>

> The BC548 is the recognised sub for the BC108, but a BC550 will be just
> as good I would have thought.
>
> I think the BC187 is a PNP, but the schematic will confirm this, so it
> could probably be subbed with the BC560.
>
> Pin outs will be different though.

Tony is spot on. According to my ageing copy of 'Towers', BC187 is a PNP,
Vce 25V, IC 100mA, Hfe 50M min, Hfe 100 min.

Towers Lists 2N3965 as an equivalent, though with slightly different pin out
BC559.560 should be fine.

TUP, TUN....Yep, I bought Elektor in those days too!

A thought, this has just fired some random neurons in my very mnomonic
memory. Has anyone got a very early copy of Elektor with a TTL composite top
octave generator in it? I accidentally left over half my Elektor collection
behind when I moved house, and the demolition men buried them. It was
definitely pre 1975. I used it in a primitive organ/polysynth I built as a
student, because I could run it at 16x frequency and do wave synthesis, and
mad things like pitch bend and octave tremulant. I can't remember the
circuit at all, except for the fact it used a number of frequencies combined
by 'wired OR', then divided down to reduce jitter.

Mike



From juergen.haible at siemens.com  Fri Apr 27 13:35:04 2007
From: juergen.haible at siemens.com (Haible, Juergen)
Date: Fri, 27 Apr 2007 13:35:04 +0200
Subject: AW: [sdiy] improved dynamic range diffpair-vca
In-Reply-To: <002501c78828$35f163b0$0200a8c0@jhsilent>
References: <002501c78828$35f163b0$0200a8c0@jhsilent>
Message-ID: <88AEA5AC18A141439A0D954EB037B0D3096D103D@ERLD164A.ww004.siemens.net>

> The dolby's patent shows a variable resistance cell using a 
> differential
> pair with a lot of diodes at the common emitter (Fig. 6). 
>   http://www.pat2pdf.org/patents/pat4068139.pdf
>   An OTA with 100% feedback works as a variable resistor.

Wow, that's an interesting way to look at it indeed!

My first reaction was: This has nothing to do with an OTA or
differential pair; it's just a cleverly folded diode stack. (Maybe to
avoid using a straight diode stack, who knows? EMS used  stacks of 10
diodes for the Phaser in their HiFli, for instance.)
It's also described as a diode stack in the patent text (column 7, lines
19ff).
And yet you are right: The same circuit can be considered as an OTA with
a "diode-degenerated emitter" differential pair, and 100% feedback (node
38 being both the OTA output and the inverting input).

Amazing!

JH.






> 
> It was published in 70's.  So, the Japanese patent application
> can not be patented  ;-)
> 
> Sam Hoshuyama
> Saitama, JAPAN
> 
> 
> From: Aaron Lanterman <lanterma at ece.gatech.edu>
> Date: 2007/04/26 03:28:30
> >
> > On Thu, 26 Apr 2007, HOSHUYAMA wrote:
> >
> > > Actually, what I saw the circuit topology was a patent 
> application (In
> > > Japan, almost all the patent applications becomes public 
> after one and a
> > > half years.) not a filed patent.
> > >
> > > A couple of years ago, I saw the same structure in a Japanese
> > > electronics book published in 80's. I guess, the structure was not
> > > patented.
> >
> > Interesting! Thanks!
> >
> > - Aaron
> >
> > 
> --------------------------------------------------------------
> ---------------
> >
> > Dr. Aaron Lanterman, Asst. Prof.
> > and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> > College of Electri. and Comp. Eng.   Fax:    404-894-8363
> > Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> > Mail Code 0250                       Web: 
> > users.ece.gatech.edu/~lanterma
> > Atlanta, GA 30332                    Office: Centergy 5212
> >
> >
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> 



From dalenkarl at yahoo.se  Fri Apr 27 14:28:37 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Fri, 27 Apr 2007 14:28:37 +0200 (CEST)
Subject: SV: Re: SV: [sdiy] Transistor score
In-Reply-To: <20070427070031.43331168077@webmail2.surf-town.net>
Message-ID: <668276.79509.qm@web27608.mail.ukl.yahoo.com>

I sincerely hope that you are aware that in Denmark there are a new law
that constitutes that possessors of old non compliant RHOS material has to
export that possession to Sweden ,if not the possessor has to pay a fee of
staggering 15euro to the ministry of non compliant ROHS material in Denmark. 

So i can offer me to take the car and meet you at the very middle of 
the Oresunds bridge as to so save you from said danish law and also 
save you from the embarrasement of being in posession of non compliant
ROHS material as to firmly keep the very high standard of our
Scandinavian moral and ethic.

However i do have to decrese my bid to 4.5euro due to the cost of 
car transport. 

KD

--- Mikael M?rup <mikael at mikmo.dk> skrev:

> That is a very generous offer, but since these devices are not RHOS compliant
> selling them to someone outside Europe would probably constitute a violation
> of serveral laws, rules and regulations, which of course is compleatly
> against my high moral and ethic standards.
> 
> :-)
> 
> Mikael
> 
> 
>  On Fri Apr 27  3:02 , karl dalen <dalenkarl at yahoo.se> sent:
> 
> >All of that are very old and not very useful stuff, do not believe what 
> >other people on this forum tells you, however i can ease your burden
> >to junk it safely in compliance to the RHOS demands offering to pay
> >you lets say, 5euro for the lot!
> >
> >Yes?
> >
> >In sincere and honest regards.
> >KD
> >
> >--- Mikael M?rup mikael at mikmo.dk> skrev:
> >
> >> 
> >> A friend of mine who is working as en electronics tech. at a university
> lab
> >> asked me i i wanted to look at "some old crap" before it was dumped.
> >> 
> >> In a small cardboard box was a number of littele plastic bags with what i
> >> believe is different matched transistor pairs from ancient times.
> >> 
> >> All of them are metal can transistors with 6 pins, some of them i know,
> and
> >> know are interesting, but i would like to hear if anyone knows if any of
> >> these are usefull in a synth context :
> >> 
> >> MAT 01    probably interesting
> >> MD 7002
> >> 2C 415
> >> 2V 435
> >> uA 726    probably  interesting , one bag of 10 marked " meassured - 
> >> selected" (in danish :-) )
> >> LM 394    probably interesting 
> >> AD 832
> >> 
> >> Some have date codes from 1974
> >> 
> >> Would any of these be usabele as substitutes for MAT02 / 04 in synth work
> ?
> >> 
> >> Also :
> >> 
> >> Some AD 136 power (Ge ??) transistors
> >> Some Burr Brown DAC708KH DAC's
> >> a few 2n4302 and 2n4303 transistors (Minimoog ???)
> >> 
> >> Mikael
> >> 
> >> 
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at dropmix.xs4all.nl
> >> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> >> 
> >
> >
> >
> >      __________________________________________________________
> >Hitta din n?sta resa p? Yahoo! Shopping.
> >J?mf?r pris p? flygbiljetter och hotellrum h?r:
> http://shopping.yahoo.se/b/a/c_169901_resor_biljetter.html
> >)
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From debus at cityweb.de  Fri Apr 27 16:38:57 2007
From: debus at cityweb.de (Ingo Debus)
Date: Fri, 27 Apr 2007 16:38:57 +0200
Subject: [sdiy] Transistor score
In-Reply-To: <668276.79509.qm@web27608.mail.ukl.yahoo.com>
References: <668276.79509.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <CF8EE977-8342-4C23-B1D2-EB80D7B82BB9@cityweb.de>


Am 27.04.2007 um 14:28 schrieb karl dalen:

> I sincerely hope that you are aware that in Denmark there are a new  
> law
> that constitutes that possessors of old non compliant RHOS material  
> has to
> export that possession to Sweden ,if not the possessor has to pay a  
> fee of
> staggering 15euro to the ministry of non compliant ROHS material in  
> Denmark.

Phew!! Luckily I disposed of all the uA726 I had before July 2006.  
Would cost me a fortune to get rid of them now.

But I still have some TUNs and TUPs. Anyone interested? I think they  
are valuable.

;-)

Ingo


From debus at cityweb.de  Fri Apr 27 16:47:11 2007
From: debus at cityweb.de (Ingo Debus)
Date: Fri, 27 Apr 2007 16:47:11 +0200
Subject: [sdiy] TTL top octave generator,
	was: transistor substitutions for BC108, BC187
In-Reply-To: <BAY133-DAV1E6CBA5F4A252B4424984A14F0@phx.gbl>
References: <20070426170518.62122.qmail@mmm1113.verio-web.com>
	<4631B23F.6010507@btinternet.com>
	<BAY133-DAV1E6CBA5F4A252B4424984A14F0@phx.gbl>
Message-ID: <BEDF2F8E-08D1-4F81-BA3B-589868CBEFDD@cityweb.de>


Am 27.04.2007 um 13:22 schrieb Mike:

> Has anyone got a very early copy of Elektor with a TTL composite top
> octave generator in it? I accidentally left over half my Elektor  
> collection
> behind when I moved house, and the demolition men buried them. It was
> definitely pre 1975. I used it in a primitive organ/polysynth I  
> built as a
> student,

I have the german issue, would that help you? You're right, it was  
November and December 1974.

You really built that monster? I built the "small" version with the  
TOS IC back then.

Ingo


From profpep at hotmail.com  Fri Apr 27 18:45:59 2007
From: profpep at hotmail.com (Mike)
Date: Fri, 27 Apr 2007 17:45:59 +0100
Subject: [sdiy] TTL top octave generator,
	was: transistor substitutions for BC108, BC187
References: <20070426170518.62122.qmail@mmm1113.verio-web.com><4631B23F.6010507@btinternet.com><BAY133-DAV1E6CBA5F4A252B4424984A14F0@phx.gbl>
	<BEDF2F8E-08D1-4F81-BA3B-589868CBEFDD@cityweb.de>
Message-ID: <BAY133-DAV14599B8550B4D8B6D1BDD8A14F0@phx.gbl>

> > Has anyone got a very early copy of Elektor with a TTL composite top
> > octave generator in it?

> I have the german issue, would that help you? You're right, it was
> November and December 1974.
>
> You really built that monster? I built the "small" version with the
> TOS IC back then.
>
Yes - and I think I did it either with veroboard or perhaps wire wrap. I
needed to run my top octave generator 16 times faster than normal, and the
TOS chips I tried simply stalled on too fast a clock. My final version used
a PLL, (using a  Plessey frequency synth chipset I think) to lock the clock
to a crystal source when the pich bend was in the middle, but allow it to
come out of lock for pitch bendiing. The idea was originally for scan tuning
in communications receivers. I also used the Elektor idea of a gated
bistable in the master clock driven from an LFO to give an octave tremolo.
The source of it all was a fire sale I went to where the insurance people
couldn't get rid of a lot of  foam sodden TTL chips. I got 3 BUCKET fulls
for ?3, (though that was a weeks spending monet then!). I took them back to
the hall of residence and washed them off  in the bath. Most of the
labelling stayed on, and my polysynth thing project began there. It finally
had a 20Amp linear power supply, lugged home on the bus from the famous Bert
Ault's shop in Birkenhead. The case and keyboard were from a burnt out Vox
'continental', I got from Frank Hessy's, paid for by repairing amplifiers. I
let a friend have custody of it when depression made an end of my student
career, and lost touch with him in the 80's. It had a 'normal' square wave
organ sound, a resurrected Vox drawbar system, and a 12 voice 'thing' that
'drew' waveforms with 16 slider pots, and I idea I saw, (I think), in a
keyboard played by Rob Jan Stips of 'Supersister'. Mine had 12 voice modules
and multiplexed the slider outputs. The envelope gens were crude, but
worked. I had a 'chord hold' for doing drones, and a sort of basic
arpeggiator. All done in LSTTL. My notes were in the binders I left with it,
so now I'll never know the details, it being so long ago, It was the first
time I ever had to put a fan on anything! It had a voice prioity system, up
to twelve sounds, or less if the hold was on, if you pressed more keys
nothing happened.  I spent more time modifying it than playing it, though
the guy who had it was a classically trained organist and liked some of the
tones it could make.

Around the same era, I did a drum machine based on a PE design, using 7489
RAM chips, (16x4 bits!). To do patterns I added another set of RAMs with
instructions in them. I found some of the sketches a few years ago, and
realised I'd kind of re-invented the stored program computer, with a kind of
Harvard architecture. I was a bit bipolar then, and would solve quite
complex stuff whilst on the upward curve, (usually to crash when I mentally
ran ou of gas), Still I got some interesting things done, just didn't know
how to publish them....

If you could email me a scan of the diagrams that would be very kind of
you - I want to remember why I thought it sounded interesting. Perhaps due
to some temporal jitter creating a mildly variant sound, I'm not sure.

Thanks. Hope I haven't bored too many peoplel with this trip through my
personal dusty archive.

Mike



From profpep at hotmail.com  Fri Apr 27 18:53:06 2007
From: profpep at hotmail.com (Mike)
Date: Fri, 27 Apr 2007 17:53:06 +0100
Subject: SV: [sdiy] Transistor score
References: <668276.79509.qm@web27608.mail.ukl.yahoo.com>
Message-ID: <BAY133-DAV16BB219314F14FFC4C284DA14F0@phx.gbl>

> So i can offer me to take the car and meet you at the very middle of
> the Oresunds bridge as to so save you from said danish law and also
> save you from the embarrasement of being in posession of non compliant
> ROHS material as to firmly keep the very high standard of our
> Scandinavian moral and ethic.
>

Are you going to get him a discounted price on the Oresunds bridge too? If
so, I've got a very nice one in London he might be interested in.

 I've just found about 10 uA723's in Gold plated metal/ceramic cases, I
think they are military, because they are lighter weight than usual too, and
the pins are a loose fit in turned pin sockets. There must still be a lot of
chipps lost in various old store rooms. What would be your ideal 'find'?

Mike



From moogah at gmail.com  Fri Apr 27 19:44:04 2007
From: moogah at gmail.com (Jeff Farr)
Date: Fri, 27 Apr 2007 13:44:04 -0400
Subject: SV: [sdiy] Transistor score
In-Reply-To: <BAY133-DAV16BB219314F14FFC4C284DA14F0@phx.gbl>
References: <668276.79509.qm@web27608.mail.ukl.yahoo.com>
	<BAY133-DAV16BB219314F14FFC4C284DA14F0@phx.gbl>
Message-ID: <78f89520704271044g12f0b210vc19553daad26e604@mail.gmail.com>

LOL, thats a pretty good list for "some old crap".  Probably best
suited to repairing older synths rather than newer designs, but..
ua726's going into the trash?  Good deal :)

By chance you want to get rid of some of the 2n4302's?


From rtellason at verizon.net  Fri Apr 27 19:44:31 2007
From: rtellason at verizon.net (Roy J. Tellason)
Date: Fri, 27 Apr 2007 13:44:31 -0400
Subject: [sdiy] transistor substitutions for BC108, BC187
In-Reply-To: <20070426170518.62122.qmail@mmm1113.verio-web.com>
References: <20070426170518.62122.qmail@mmm1113.verio-web.com>
Message-ID: <200704271344.32222.rtellason@verizon.net>

On Thursday 26 April 2007 13:05, rdrake wrote:
> looking at an older circuit from PE magazine, I'm unable to locate
> transistors BC187 or BC108... anybody know of resonable replacements that
> are obtainium?

Not offhand,  but you can find data on them here:

http://www.classiccmp.org/rtellason/transistors-3up.html

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin



From rtellason at verizon.net  Fri Apr 27 19:46:09 2007
From: rtellason at verizon.net (Roy J. Tellason)
Date: Fri, 27 Apr 2007 13:46:09 -0400
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
References: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
	<20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
	<87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
Message-ID: <200704271346.09609.rtellason@verizon.net>

On Thursday 26 April 2007 18:21, Tim Parkhurst wrote:
> On 4/26/07, karl dalen <dalenkarl at yahoo.se> wrote:
> > I wonder, they have these car play-the-loudest-championship,
> > what tone or composite sound frame at which pitch gives the
> > highest movement of air? Ie dB.
> >
> >
> > KD
>
> I think it would depend on the resonant frequency of the car's
> interior. If you could find that frequency, then that would help you
> maximize the amount of air movement you would get out of the stereo
> system. The response peaks of the stereo system would also pay a key
> role. The scientific approach would be to plot the resonant peaks of
> the car's interior, overlay those with a graph of the response of the
> stereo, find the frequencies where the two plots coincide, and then
> look for music with similar frequency peaks.  In practice however, I
> think it comes down to "play a bunch of tunes and see what sounds /
> feels loudest." Oh, and the tune has to have lots of thumpin' bass.
> ;-)
>
>
> Tim (def dumb and blind jam) Servo

And then of course there's the issue of whether you point those speakers 
toward the rear for better gas mileage,  or up for better traction...  :-)

-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin



From jhaible at debitel.net  Fri Apr 27 21:43:36 2007
From: jhaible at debitel.net (JH.)
Date: Fri, 27 Apr 2007 21:43:36 +0200
Subject: [sdiy] improved dynamic range diffpair-vca
References: <002501c78828$35f163b0$0200a8c0@jhsilent>
	<88AEA5AC18A141439A0D954EB037B0D3096D103D@ERLD164A.ww004.siemens.net>
Message-ID: <001f01c78904$5a75e9e0$0200a8c0@jhsilent>


> The dolby's patent shows a variable resistance cell using a 
> differential
> pair with a lot of diodes at the common emitter (Fig. 6). 
>   http://www.pat2pdf.org/patents/pat4068139.pdf
>   An OTA with 100% feedback works as a variable resistor.

Wow, that's an interesting way to look at it indeed!

My first reaction was: This has nothing to do with an OTA or
differential pair; it's just a cleverly folded diode stack. (Maybe to
avoid using a straight diode stack, who knows? EMS used  stacks of 10
diodes for the Phaser in their HiFli, for instance.)
It's also described as a diode stack in the patent text (column 7, lines
19ff).
And yet you are right: The same circuit can be considered as an OTA with
a "diode-degenerated emitter" differential pair, and 100% feedback (node
38 being both the OTA output and the inverting input).

Amazing!

JH.



From dalenkarl at yahoo.se  Fri Apr 27 22:25:58 2007
From: dalenkarl at yahoo.se (karl dalen)
Date: Fri, 27 Apr 2007 22:25:58 +0200 (CEST)
Subject: SV: Re: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <m2zm4uctpi.fsf@till.com>
Message-ID: <988992.20908.qm@web27613.mail.ukl.yahoo.com>

Oh no!! It was such a nice car!

http://en.wikipedia.org/wiki/Mercedes-Benz_240D

Anyhow, perhaps with never cars the dB could be even higher
since the windows are glued and not just fitted onto a 
rubber sealing as it was on the 240D and older cars.

KD


--- Don Tillman <don at till.com> skrev:

>    > Date: Thu, 26 Apr 2007 22:30:10 +0200 (CEST)
>    > From: karl dalen <dalenkarl at yahoo.se>
>    > 
>    > I wonder, they have these car play-the-loudest-championship,
>    > what tone or composite sound frame at which pitch gives the
>    > highest movement of air? Ie dB.
> 
> Mythbuster, Season 4, Episode 69, "Shattering Subwoofer"
> 
> Jamie and Adam built a 50-inch subwoofer into a Mercedes 240D, where
> the woofer cone was driven by the driveshaft.  It produced 16Hz at a
> level of about 161 dB, blowing off the sunroof.  There ya go!
> 
>   -- Don
> 
> -- 
> Don Tillman
> Palo Alto, California
> don at till.com
> http://www.till.com
> 



      L?t v?rk?nslorna spira.
Hitta din tvillingsj?l p? Yahoo! Dejting: http://se.meetic.yahoo.net


From cornutt at hiwaay.net  Sat Apr 28 01:14:17 2007
From: cornutt at hiwaay.net (David Cornutt)
Date: Fri, 27 Apr 2007 18:14:17 -0500
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
References: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
	<20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
	<87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
Message-ID: <414186F7-F98D-480E-AC35-FA98FAEBA526@hiwaay.net>


On Apr 26, 2007, at 5:21 PM, Tim Parkhurst wrote:

> In practice however, I
> think it comes down to "play a bunch of tunes and see what sounds /
> feels loudest." Oh, and the tune has to have lots of thumpin' bass.
> ;-)
>

I watched a documentary about that once...  Actually, the systems they
use are very sharply tuned to play a specific tone.  They aren't capable
of playing music at all.



From tim.parkhurst at gmail.com  Sat Apr 28 01:38:43 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Fri, 27 Apr 2007 16:38:43 -0700
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <414186F7-F98D-480E-AC35-FA98FAEBA526@hiwaay.net>
References: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
	<20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
	<87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
	<414186F7-F98D-480E-AC35-FA98FAEBA526@hiwaay.net>
Message-ID: <87441170704271638s487b1da9ya60d91d44437522a@mail.gmail.com>

On 4/27/07, David Cornutt <cornutt at hiwaay.net> wrote:
>
> On Apr 26, 2007, at 5:21 PM, Tim Parkhurst wrote:
>
> > In practice however, I
> > think it comes down to "play a bunch of tunes and see what sounds /
> > feels loudest." Oh, and the tune has to have lots of thumpin' bass.
> > ;-)
> >
>
> I watched a documentary about that once...  Actually, the systems they
> use are very sharply tuned to play a specific tone.  They aren't capable
> of playing music at all.
>

Well, if the only criteria is sheer volume, you might as well just
stuff a big compressor and some air horns from an ocean liner into the
back of a truck. ;-) Those freaking things will deafen everybody
within a 100 yards!


Tim (the same is often said about my music) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From colin at colinfraser.com  Sat Apr 28 01:48:41 2007
From: colin at colinfraser.com (Colin f)
Date: Sat, 28 Apr 2007 00:48:41 +0100
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <87441170704271638s487b1da9ya60d91d44437522a@mail.gmail.com>
Message-ID: <000f01c78926$95a80e90$0101a8c0@zen2>

 
> Well, if the only criteria is sheer volume, you might as well just
> stuff a big compressor and some air horns from an ocean liner into the
> back of a truck. ;-) Those freaking things will deafen everybody
> within a 100 yards!

In a pissing contest, use of a fire hose is probably considered cheating.

Cheers,
Colin f




From cornutt at hiwaay.net  Sat Apr 28 01:59:10 2007
From: cornutt at hiwaay.net (David Cornutt)
Date: Fri, 27 Apr 2007 18:59:10 -0500
Subject: [sdiy] Car stereo play-the-loudest-championship!
In-Reply-To: <87441170704271638s487b1da9ya60d91d44437522a@mail.gmail.com>
References: <908a4c120704252144r16c1ccbcm2bbe5db4abfdd44c@mail.gmail.com>
	<20070426203010.14515.qmail@web27603.mail.ukl.yahoo.com>
	<87441170704261521y18b95479qa5736600af0caacc@mail.gmail.com>
	<414186F7-F98D-480E-AC35-FA98FAEBA526@hiwaay.net>
	<87441170704271638s487b1da9ya60d91d44437522a@mail.gmail.com>
Message-ID: <D250A46A-85BA-4121-82E4-50C61FFE418A@hiwaay.net>


On Apr 27, 2007, at 6:38 PM, Tim Parkhurst wrote:

> Well, if the only criteria is sheer volume, you might as well just
> stuff a big compressor and some air horns from an ocean liner into the
> back of a truck. ;-)

That was pretty much my reaction -- "What's the point?"



From ijfritz at comcast.net  Sat Apr 28 02:05:10 2007
From: ijfritz at comcast.net (Ian Fritz)
Date: Fri, 27 Apr 2007 18:05:10 -0600
Subject: [sdiy] Friendly reminder
In-Reply-To: <200704050218.l352IpX9009809@linux7.lan>
References: <200704050218.l352IpX9009809@linux7.lan>
Message-ID: <6.2.1.2.2.20070427175757.021d8638@mail.comcast.net>

Hello --

There are quite a few folks who wanted the EZ Chaos boards but haven't sent 
me funds or shipping info yet.  Please let me hear from you soon so I can 
plan for further orders.  For those who missed it, this is a board for the 
chaos module described here:
http://home.comcast.net/~ijfritz/ch_cir1.htm

Sorry for the commercialism -- at least it's on topic. :-)

   Ian



From secoff at execpc.com  Sat Apr 28 03:57:46 2007
From: secoff at execpc.com (Sam Ecoff)
Date: Fri, 27 Apr 2007 20:57:46 -0500
Subject: [sdiy] Newbie power connector problem
Message-ID: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>

Hi All...

Sorry in advance for the newbie question.

I've been building some modules lately which don't have a spot for a . 
156" connector. So, I've been simply soldering the power leads  
directly to the board. This works o.k., but even with great care,  
with slight flexing, the cables snap. So... I'm looking for a better  
way to connect power. To be specific, I'm building boards by Mr. Ray  
Wilson, and Mr. Tom Gamble, and a couple of other designers. The  
boards by Mr. Gamble were designed to accommodate a .156" connector,  
but the mounting holes are off by just enough that a .156" connector  
won't fit, regardless of how much 'persuading' it receives. The  
boards by Mr. Wilson were not designed to accept .156" connectors. I  
don't fault either designer, I'm just looking for some advice about  
how I can improve my construction methods.

Thanks in advance for the help.

Sam E.
_______________________________
Sam Ecoff
Tanner/Monagle
1120 N. Market St.
Milwaukee, WI 53202
(414) 727-8190
www.samecoff.com




From jays at aracnet.com  Sat Apr 28 04:18:58 2007
From: jays at aracnet.com (Jay Schwichtenberg)
Date: Fri, 27 Apr 2007 19:18:58 -0700
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
Message-ID: <GDEMKJDLKPDJFJGFBDFGMEEDCOAA.jays@aracnet.com>

Some of the EFM boards can be coaxed (sp?) into accepting a 0.156 connector
by drilling out the holes some. But be careful you can push the pins through
the plastic base.

But in general you want to strain relief the cable. Make sure the flexing
point is not where the cable is soldered to the board but somewhere else
where the cable will not wear. If there is a mounting hole near where the
cable comes to the board maybe use a tie wrap to hold the power cable to the
board. Or if there is a metal plate the board is mounted to drill a hole in
it to use a tie wrap. Make sure there is not a way for the metal to wear
thru (no sharp edges) the insulation on the wire by it bending/flexing.
There are also a number of already made fasteners/strain relief/cable clamp
parts also so maybe a quick pass through a Mouser or Digi-key catalog would
give you some ideas.

Good luck.
Jay S.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Sam Ecoff
Sent: Friday, April 27, 2007 6:58 PM
To: Synth DIY
Subject: [sdiy] Newbie power connector problem


Hi All...

Sorry in advance for the newbie question.

I've been building some modules lately which don't have a spot for a .
156" connector. So, I've been simply soldering the power leads
directly to the board. This works o.k., but even with great care,
with slight flexing, the cables snap. So... I'm looking for a better
way to connect power. To be specific, I'm building boards by Mr. Ray
Wilson, and Mr. Tom Gamble, and a couple of other designers. The
boards by Mr. Gamble were designed to accommodate a .156" connector,
but the mounting holes are off by just enough that a .156" connector
won't fit, regardless of how much 'persuading' it receives. The
boards by Mr. Wilson were not designed to accept .156" connectors. I
don't fault either designer, I'm just looking for some advice about
how I can improve my construction methods.

Thanks in advance for the help.

Sam E.
_______________________________
Sam Ecoff
Tanner/Monagle
1120 N. Market St.
Milwaukee, WI 53202
(414) 727-8190
www.samecoff.com


_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy




From jluciani at gmail.com  Sat Apr 28 04:25:20 2007
From: jluciani at gmail.com (John Luciani)
Date: Fri, 27 Apr 2007 22:25:20 -0400
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
References: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
Message-ID: <608bfe540704271925h47861010wbda1fa88e7ac5fad@mail.gmail.com>

On 4/27/07, Sam Ecoff <secoff at execpc.com> wrote:
> Hi All...
>
> Sorry in advance for the newbie question.
>
> I've been building some modules lately which don't have a spot for a .
> 156" connector. So, I've been simply soldering the power leads
> directly to the board. This works o.k., but even with great care,
> with slight flexing, the cables snap. So... I'm looking for a better
> way to connect power. To be specific, I'm building boards by Mr. Ray
> Wilson, and Mr. Tom Gamble, and a couple of other designers. The
> boards by Mr. Gamble were designed to accommodate a .156" connector,
> but the mounting holes are off by just enough that a .156" connector
> won't fit, regardless of how much 'persuading' it receives. The
> boards by Mr. Wilson were not designed to accept .156" connectors. I
> don't fault either designer, I'm just looking for some advice about
> how I can improve my construction methods.

What kind of wire are using? The only time I have had a stranded wire snap is
when I accidentally nicked the wires with the wire strippers.

What I usually do when I attach wires to a vector board or a PCB is
use Vector K24A
pins. I solder the pins to the board and then solder the wires to the
pins. If the
holes are too large for K24A pins check out Mill-max for some larger pins.

If the holes are only slightly off (from the .156" pattern) and the board is
one or two layers you may be able to drill it.

(* jcl *)

-- 
http://www.luciani.org


From synthbaron at tampabay.rr.com  Sat Apr 28 04:25:29 2007
From: synthbaron at tampabay.rr.com (Jay)
Date: Fri, 27 Apr 2007 22:25:29 -0400
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
References: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
Message-ID: <4632B099.3010108@tampabay.rr.com>

Sam Ecoff wrote:

> The boards by Mr. Gamble 
> were designed to accommodate a .156" connector, but the mounting holes 
> are off by just enough that a .156" connector won't fit, regardless of 
> how much 'persuading' it receives.

I just used a drill bit to make the holes just slightly larger. They 
make "round" posted .156 connectors, and I suppose the boards were made 
to fit those.


From synth1 at airmail.net  Sat Apr 28 06:21:20 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Fri, 27 Apr 2007 23:21:20 -0500
Subject: [sdiy] [FS] Giant Analog Devices Op Amp book
Message-ID: <035c01c7894c$ad928910$7800a8c0@bilbo>

I have a perfect condition, Analog Devices bound book "1992 Amplifier 
Applications Guide", over 250 pages, large format (8.5 x 11in). Even though it 
uses AD op amps for the examples, 99% of the time the circuit is not dependent 
on *that* particular op amp. Lots of schematics, equations, diagrams. The book 
is fairly heavy (3.5lbs). Covers audio, DC noise calculations, filters, preamps, 
etc.

$20 w/shipping in the US. $45 for overseas. Paypal only.

Paul S.



From synth1 at airmail.net  Sat Apr 28 06:55:39 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Fri, 27 Apr 2007 23:55:39 -0500
Subject: [sdiy] Op Amp book sold, but here is another treat.....
Message-ID: <038401c78951$791564f0$7800a8c0@bilbo>

Thanks to Nick, who bought the AD Op Amp book (I am clearing out 30 years of 
stuff, mid-life crisis sort of thing).

I have a dead-mint rare Ferranti-Interdesign book, "301 Analog IC Designs". This 
book is what Doug Curtis used to design the CEM ICs (the first run of parts were 
on Interdesign arrays). All of these circuits are *transistor-level* designs. 
The first part of the book covers current mirrors, which is how resistors are 
implemented in actual ICs. Lots of VCAs, amplifiers, comparators, amplifiers, 
power circuits, some digital even. If you were ever interested on the "guts" of 
CEM/SSM ICs, this is a starting point (no, there are NOT actual CEM/SSM 
schematics in this book).

$30 w/shipping in the US, $40 foreign.

Paul S.



From secoff at execpc.com  Sat Apr 28 07:00:30 2007
From: secoff at execpc.com (Sam Ecoff)
Date: Sat, 28 Apr 2007 00:00:30 -0500
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <4632B099.3010108@tampabay.rr.com>
References: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
	<4632B099.3010108@tampabay.rr.com>
Message-ID: <A19D9BE3-C9E6-4312-9D5D-65255C0D89C9@execpc.com>

Yeah, some careful drilling worked on some of the boards, but others  
were off enough that drilling wouldn't cut it.

Thanks anyhow,

Sam E.
_______________________________
Sam Ecoff
Tanner/Monagle
1120 N. Market St.
Milwaukee, WI 53202
(414) 727-8190
www.samecoff.com


On Apr 27, 2007, at 9:25 PM, Jay wrote:

> Sam Ecoff wrote:
>
>> The boards by Mr. Gamble were designed to accommodate a .156"  
>> connector, but the mounting holes are off by just enough that a . 
>> 156" connector won't fit, regardless of how much 'persuading' it  
>> receives.
>
> I just used a drill bit to make the holes just slightly larger.  
> They make "round" posted .156 connectors, and I suppose the boards  
> were made to fit those.
>



From secoff at execpc.com  Sat Apr 28 07:34:26 2007
From: secoff at execpc.com (Sam Ecoff)
Date: Sat, 28 Apr 2007 00:34:26 -0500
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <608bfe540704271925h47861010wbda1fa88e7ac5fad@mail.gmail.com>
References: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
	<608bfe540704271925h47861010wbda1fa88e7ac5fad@mail.gmail.com>
Message-ID: <7E666137-1047-488B-A79F-54FD54EDFADB@execpc.com>

On Apr 27, 2007, at 9:25 PM, John Luciani wrote:

> What kind of wire are using? The only time I have had a stranded  
> wire snap is
> when I accidentally nicked the wires with the wire strippers.

Stranded. I had to cut away about half of the bare wire to get it to  
fit into the PCB holes, and I probably weakened some of the wire I  
left when cutting some away with the stripper. However, when the  
power cable flexes, the flexing happens solely at the point where the  
power cables meet the PCB since that's the wire's most flexible point  
being that there's no insulation there.

> What I usually do when I attach wires to a vector board or a PCB is
> use Vector K24A
> pins. I solder the pins to the board and then solder the wires to the
> pins. If the
> holes are too large for K24A pins check out Mill-max for some  
> larger pins.

I guess I don't completely understand how this would work. Wouldn't  
the wire still have its weakest and most flexible point right where  
the wire joined the pin and thus be prone to breaking there? Maybe  
I'm missing something obvious in my newbie ness.

Thanks for your patience and your kind assistance.

Sam E.




From controlvoltage at gmail.com  Sat Apr 28 07:43:33 2007
From: controlvoltage at gmail.com (Amos)
Date: Sat, 28 Apr 2007 01:43:33 -0400
Subject: [sdiy] nifty book find
Message-ID: <908a4c120704272243rdee37c7v56d3be9723b1f51e@mail.gmail.com>

I just picked this up fot $10 at my local used-book shop:

"Build your own Low-Cost Signal Generator" by Delton T. Horn
TAB books 1994; ISBN 0-07-030428-9

270 pages of simple and very useful building blocks, basic theory and
handy equations; very nice for someone starting out in SDIY or just as
a quick reference.

40 pages on DC power supply design, 20 pages of oscillators (Hartley,
Colpitts, Clapp, Armstrong, Pierce - mostly fixed-frequency but a
section on voltage control and some useful theory on the topologies);
30 pages on waveshaping; noise generators, complex waveform and
arbitrary function generators, and a decent section at the end on
PLLs, digital clock generators, frequency multiplication and division,
and synthesizing analog waveforms digitally.  Really quite nice!


From synth1 at airmail.net  Sat Apr 28 07:55:39 2007
From: synth1 at airmail.net (Paul Schreiber)
Date: Sat, 28 Apr 2007 00:55:39 -0500
Subject: [sdiy] InterDesign book sold
Message-ID: <03b601c78959$da8b37c0$7800a8c0@bilbo>

Thanks for the inquiries.

Paul S.
still cleaning



From jluciani at gmail.com  Sat Apr 28 15:19:28 2007
From: jluciani at gmail.com (John Luciani)
Date: Sat, 28 Apr 2007 09:19:28 -0400
Subject: [sdiy] Newbie power connector problem
In-Reply-To: <7E666137-1047-488B-A79F-54FD54EDFADB@execpc.com>
References: <48402747-C49F-4437-A236-4CDCB5004DDF@execpc.com>
	<608bfe540704271925h47861010wbda1fa88e7ac5fad@mail.gmail.com>
	<7E666137-1047-488B-A79F-54FD54EDFADB@execpc.com>
Message-ID: <608bfe540704280619oabf1d26v96b7baf182fbcefa@mail.gmail.com>

On 4/28/07, Sam Ecoff <secoff at execpc.com> wrote:

>
> > What I usually do when I attach wires to a vector board or a PCB is
> > use Vector K24A
> > pins. I solder the pins to the board and then solder the wires to the
> > pins. If the
> > holes are too large for K24A pins check out Mill-max for some
> > larger pins.
>
> I guess I don't completely understand how this would work. Wouldn't
> the wire still have its weakest and most flexible point right where
> the wire joined the pin and thus be prone to breaking there? Maybe
> I'm missing something obvious in my newbie ness.

A  wire that is wrapped around the pin and soldered is a very strong connection
In the bottom picture at http://www.luciani.org/eng-notes/ee-notes/noise
I have some wires soldered to K24A pins. Keep in mind that these are only debug
wires that were quickly soldered for testing. If you tin the wire,
wrap it 3/4 turn
around the gold pin and solder the wire you create a very strong connection.
it would take quite a bit of flexing to break the connection. If you
can stain relief
the wire the connection should never break.

(* jcl *)


-- 
http://www.luciani.org


From asfi at eol.ca  Sun Apr 29 00:36:20 2007
From: asfi at eol.ca (Colin Hinz)
Date: Sat, 28 Apr 2007 18:36:20 -0400 (Eastern Daylight Time)
Subject: =?US-ASCII?B?UkU6IFtzZGl5XSBXZWlyZCBTb3VuZCBHZW5lcmF0b3I=?=
In-Reply-To: <20070425025306.52637.qmail@mmm1113.verio-web.com>
References: <20070425025306.52637.qmail@mmm1113.verio-web.com>
Message-ID: <Pine.WNT.4.64.0704281833040.1564@dell-qvon2e3xxt>

On Tue, 24 Apr 2007, rdrake wrote:

> andrew,
>
> yes on the pin-outs... in/out pairs for the gates are 1/2, 3/4, 5/6,
> 9/8, 11/10, and 13/12.
>
> there's a handy stripboard layout for a dual WSG here:
> http://electro-music.com/forum/viewtopic.php?t=7074. 
> uses the second half of the 40106 to create the second circuit.
> i've built it & it works.

That's the layout that's also on Ray Wilson's website. I modified it
slightly to include the unfiltered output and volume pots as well.

With that layout, the 40106 maps pins 1,2,3,4,5,6 for the first
oscillator, and 13,12,11,10,9,8 (respectively) for the second.

- Colin Hinz
   Toronto, Canada



From asfi at eol.ca  Sun Apr 29 00:42:24 2007
From: asfi at eol.ca (Colin Hinz)
Date: Sat, 28 Apr 2007 18:42:24 -0400 (Eastern Daylight Time)
Subject: [sdiy] Weird Sound Generator
In-Reply-To: <BAY141-F767BF87C51ABF26E769B8F5490@phx.gbl>
References: <BAY141-F767BF87C51ABF26E769B8F5490@phx.gbl>
Message-ID: <Pine.WNT.4.64.0704281837400.1564@dell-qvon2e3xxt>

On Wed, 25 Apr 2007, Ian Smith wrote:

> Hey-O,
>
> When I built my WSG, I didn't have enough parts to build the filter, so I 
> have a paltry 4 knobs. It still makes amazing sounds though. I have the 
> output wired to both a 1/4 inch jack and a Rat Shack piezo buzzer. The buzzer 
> is pretty quiet and you have to put your ear to the hole in the thing to get 
> a decent listen to it when it's not hooked up to an amp. I built it into a 
> gutted out Magic 8 Ball... kinda looks like an underwater mine.
>
> picture here:
>
> http://www.deviantart.com/deviation/49650660/?qo=7&q=by%3Ataciturnunquiet&qh=sort%3Atime+-in%3Ascraps

You should send a photo to Ray Wilson. He has a gallery of wacky and zany
case constructions for the circuit-beast.

I bet your wacky and zany case would make you the talk of the town in Boston.

- Colin Hinz
   Toronto, Canada



From edwardcking2001 at yahoo.co.uk  Sun Apr 29 05:45:46 2007
From: edwardcking2001 at yahoo.co.uk (Edward King)
Date: Sun, 29 Apr 2007 06:45:46 +0300
Subject: [sdiy] Pressure + position based vibrato
Message-ID: <005b01c78a10$e39b63f0$1600000a@eklt1>

Hi guys. Sorry i havent contributed in a while, but a new client has me run 
ragged!

just before I left home to travel to the uk again, I was able to spend an 
hour or two on my aftertouch experiments.

Essentially, I was determined to try out all of the possibilities I listed 
as part of my journey through expressive capabilities. A number of 
instruments (including guitar and violin) were under-represented in most of 
the ideas I had and I havent had a huge amount of success mounting stuff to 
the tops of keys (even very low profile stuff dramatically changes the 
playability of the keys).

Consequently, I came to the conclusion that using a hard rubber bush 
mounting for a key on the pivot rod may give a key enough rocking movement 
to provide a differential from the key resting against either of two 
pressure sensitive pads (QTC material).

The initial experiment (although very rapidly thrown together) showed that 
even with rapid movements, there is enough of a difference in the outputs 
from the pressure pads to be readily measureable through ADC.

Questions arise (lifetime of rubber bushes, degredation, feel of the 
keyboard with all of the keys mounted this way - Ive only tried one so far 
etc) and Im sure that someone will have tried this before (very few things 
havent been tried have they?!) so I cant help wondering why it didnt work 
out (if indeed it did not).

The only other real issue is that now double the number of pressure 
sensitive pads are required (2 per key) but that these can double up as 
aftertouch when not used for the above purpose. Even so, more wiring, more 
complicated PCBs and more pics are required, which may put most people off.

Still havent ironed out the difficulties with my slotted optical switch 
based displacement sensing. getting close, but they're still unreliable...


EK 



From intent at netpratique.fr  Sun Apr 29 23:26:31 2007
From: intent at netpratique.fr (.)
Date: Sun, 29 Apr 2007 23:26:31 +0200
Subject: [sdiy] Matrix 1000 repair, unexpected hack
Message-ID: <200704292326.31924.intent@netpratique.fr>

Hello,

I offered myself  a cheap matrix1000 that needs some care (so good i am). 

After opening it, i stumbled across a weird thing, pin24 (Clear to Send) 
of the 68b50 ACIA (IC U809) is purposefully unsoldered and left unconnected 
(by human intervention) and the timer(UM82C54) U808 just aside it has a wire 
directly solderd on pin 14 (Gate 1). The wire is cut at 2 centimeters and 
left unconnected too. The previous owner told me he bought the unit new in 
the 80's and it was never serviced. In all logic it should be an oberheim 
staff intervention, but what was the purpose of it (it's so ugly), has anyone 
an idea of what it could be ?

Theses 2 chips, U808 and U809, are involved in MIDI handling  but so far MIDI 
IN and OUT seem to work OK, should i worry about the CTS not 
connected ? BTW pin hole 24 on the pcb is connected to GND (like pin 23), but 
the schemos are not saying that they shoud: 

http://perso.netpratique.fr/bouddha/m1kp2.jpg
http://perso.netpratique.fr/bouddha/UM82C54.pdf
http://perso.netpratique.fr/bouddha/60b50.pdf

For now i am unable to understand that, but the real pbm the M1k has is 
somehow unrelated: all patchs seem to have volume pbm depending of the pitch 
of the DCOs.

For instance a pad will play ok only on the upper side of the keyboard, then 
just below C4 for instance, the sound is quite less loud for all the lower 
keys. However, all the 6 voices can be heard, that is good news, and indeed 
on the upper region, it sounds sweet :) There is no hum and the unit seems 
pretty noiseless.

I would say the analog chips are ok, the dac and the muxes seem to do their 
job on the 6 voices, the modulations (env/lfo/etc) seem ok.

Further tests today showed me that this if i put a slow LFO on a DCO, at a 
given pitch, the volume will drop abrutply. It looks like a logic thing, the 
pitch frontier appears to be in a region that could relate to a strong bit of 
a register. 

More, if i put some noise or some resonnance, the level of theses are not 
affected and i can hear the 2 DCOs independetly with different LFO reaching 
the frontier at different time and being affected individually while the 
noise remain unaffected. So it seems its not related to the VCA and indeed 
something happens before the CEMs.

At first i suspected the CPU, but i am not sure how could happen such 
phenomens. And since all the LFO/env, etc are generated by the CPU, if it was 
bad would the synth be partly functionning as it it ?

On the other hand the CPU is quite hot, right after a few minutes, and 
something tells me anormally hot. The unit freezes completly sometimes when u 
edit parameters.

I made the basic cheking stuff, reinit the unit, calibration test (that 
don't seem to show error), mesuring the test points voltage on the circuit 
(all ok).

If anyone had a similar experience with the M6/M1k involving some logic 
(CPU/eprom/etc), i would be glad to know if some parts are know to be 
sensitive, and every other comments are very welcome. 

Thx for reading,

NR

PS: Some other quick links for the m1k schemos:
http://perso.netpratique.fr/bouddha/m1kp10.jpg    (cem)
http://perso.netpratique.fr/bouddha/m1kp3.jpg
http://perso.netpratique.fr/bouddha/m1kp4.jpg
http://perso.netpratique.fr/bouddha/m1kp5.jpg




From aym-htnys at teaser.fr  Mon Apr 30 08:54:30 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Mon, 30 Apr 2007 08:54:30 +0200
Subject: [sdiy] Matrix 1000 repair, unexpected hack
In-Reply-To: <200704292326.31924.intent@netpratique.fr>
References: <200704292326.31924.intent@netpratique.fr>
Message-ID: <20070430065430.GA24855@aym.net2.nerim.net>

On 2007-04-29 23:26 +0200, . wrote:

> After opening [a Matrix 1000], i stumbled across a weird thing,
> pin24 (Clear to Send) of the 68b50 ACIA (IC U809) is
> purposefully unsoldered and left unconnected (by human
> intervention) and the timer(UM82C54) U808 just aside it has a
> wire directly solderd on pin 14 (Gate 1). The wire is cut at 2
> centimeters and left unconnected too.
> 
> Theses 2 chips, U808 and U809, are involved in MIDI handling but
> so far MIDI IN and OUT seem to work OK, should i worry about the
> CTS not connected ?

I'm not familiar with the 6850 but CTS is a hardware handshaking
signal and as such does not apply to MIDI. If there's an internal
pull-up, you can leave CTS unconnected (or so I expect).

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From colin at colinfraser.com  Mon Apr 30 09:52:09 2007
From: colin at colinfraser.com (Colin f)
Date: Mon, 30 Apr 2007 08:52:09 +0100
Subject: [sdiy] Matrix 1000 repair, unexpected hack
In-Reply-To: <20070430065430.GA24855@aym.net2.nerim.net>
Message-ID: <000601c78afc$748148d0$0101a8c0@zen2>

 
> > Theses 2 chips, U808 and U809, are involved in MIDI handling but
> > so far MIDI IN and OUT seem to work OK, should i worry about the
> > CTS not connected ?
> 
> I'm not familiar with the 6850 but CTS is a hardware handshaking
> signal and as such does not apply to MIDI. If there's an internal
> pull-up, you can leave CTS unconnected (or so I expect).

I've used 6850s for MIDI interfacing many years ago.
You'll find a schematic for the 6850-based Hybrid Music 2000 interface here:
http://www.colinfraser.com/m5000/m2000sch.pdf
and will see CTS and DTS are pulled low externally.

I'm sure it doesn't matter which way they are pulled if you aren't using
handshaking though.

Cheers,
Colin f




From jonknapp2001 at yahoo.com  Mon Apr 30 12:24:10 2007
From: jonknapp2001 at yahoo.com (jo cool)
Date: Mon, 30 Apr 2007 03:24:10 -0700 (PDT)
Subject: [sdiy] siel mono
Message-ID: <731526.59590.qm@web58412.mail.re3.yahoo.com>

Hello there
Anyone know anything about the siel mono
I have one ,but sound output is becoming very erratic
and uncontrolable
Thanks
jon

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
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From keithw at cix.compulink.co.uk  Mon Apr 30 13:45:00 2007
From: keithw at cix.compulink.co.uk (Keith Winstanley)
Date: Mon, 30 Apr 2007 12:45 +0100 (BST)
Subject: [sdiy] Thoughts on RoHS
Message-ID: <memo.33804@cix.compulink.co.uk>

Hmm..

as I cycled in to work today I spotted about 5 lead wheel balance
weights on the roads; probably more lead that in all my modulars.
What's this RoHS actually achieving apart from suppression on small
scale industry?

Keith

http://home.freeuk.net/lowpass



From hughes_david_j at btopenworld.com  Mon Apr 30 14:30:11 2007
From: hughes_david_j at btopenworld.com (David J. Hughes)
Date: Mon, 30 Apr 2007 13:30:11 +0100
Subject: [sdiy] Thoughts on RoHS
In-Reply-To: <memo.33804@cix.compulink.co.uk>
Message-ID: <C25B9FE3.16379%hughes_david_j@btopenworld.com>

on 30/4/07 12:00 pm, Keith Winstanley at keithw at cix.compulink.co.uk wrote:
 
> as I cycled in to work today I spotted about 5 lead wheel balance
> weights on the roads; probably more lead that in all my modulars.
> What's this RoHS actually achieving apart from suppression on small
> scale industry?

I was dragged into a 'junk discount shop' on Saturday afternoon and noticed
that solar powered garden lights are this year's "must have" item for the
wannabe chav-set. Buy 5 for ?5.

I wondered what will happen when they start to fail in a year or two and all
of those solar cells end up in landfill sites.

David

-- 
Infection Music Limited.                     http://www.infectionmusic.co.uk

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From neil.johnson97 at ntlworld.com  Mon Apr 30 15:12:23 2007
From: neil.johnson97 at ntlworld.com (neil.johnson97 at ntlworld.com)
Date: Mon, 30 Apr 2007 13:12:23 +0000
Subject: [sdiy] Thoughts on RoHS
Message-ID: <20070430131226.BCRL26699.aamtaout03-winn.ispmail.ntl.com@smtp.ntlworld.com>


From: "David J. Hughes"
> that solar powered garden lights are this year's "must
> have" item for the wannabe chav-set. Buy 5 for ?5.
> 
> I wondered what will happen when they start to fail in a
> year or two and all of those solar cells end up in landfill
> sites.

Easy - they won't be polluting the ground with nasty lead!  That's what they'll be doing, actively NOT filling the landfills with unhealthy baby-killing brain-dissolving money-stealing would-nick-your-car-too-if-it-was-worth-a-bob-or-two lead.

Did I mention that lead is "nasty"?

(whatever you do, don't mention the batteries!)

Neil

-----------------------------------------
Email sent from www.virginmedia.com/email
Virus-checked using McAfee(R) Software and scanned for spam



From lenham at clara.co.uk  Mon Apr 30 15:52:46 2007
From: lenham at clara.co.uk (Steve Lenham)
Date: Mon, 30 Apr 2007 14:52:46 +0100
Subject: [sdiy] Thoughts on RoHS
References: <memo.33804@cix.compulink.co.uk>
Message-ID: <027101c78b2e$d5e9bc10$0202a8c0@DELL>

From: "Keith Winstanley" <keithw at cix.compulink.co.uk>

> as I cycled in to work today I spotted about 5 lead wheel balance
> weights on the roads; probably more lead that in all my modulars.
> What's this RoHS actually achieving apart from suppression on small
> scale industry?

No offence (and apologies that this has little to do with SDIY), but that is 
the classic excuse for inaction on any tricky subject nowadays - "Because we 
can't achieve perfection instantly, we shouldn't bother making any 
improvements at all".

Most progress inconveniences somebody. Back in the 1800s, somebody probably 
said:

"As I took the carriage to work today, I spotted about five ragged African 
fellows shining shoes for a pittance; probably more than I ever had working 
on my farm. What's this ban on slavery actually achieving apart from 
suppression of small scale industry"

Are you even sure that the weights were lead? I'm no expert, but I seem to 
remember lead being banned in fishing weights some time back and I'm pretty 
sure they still exist.

Again, sorry for expressing what is probably am unpopular view. I actually 
work in the small-scale electronics industry, but I live on Earth too.

Steve L. 



From tonyallgood at btinternet.com  Mon Apr 30 16:01:33 2007
From: tonyallgood at btinternet.com (Oakley Sound)
Date: Mon, 30 Apr 2007 15:01:33 +0100
Subject: [sdiy] Thoughts on RoHS
In-Reply-To: <027101c78b2e$d5e9bc10$0202a8c0@DELL>
References: <memo.33804@cix.compulink.co.uk>
	<027101c78b2e$d5e9bc10$0202a8c0@DELL>
Message-ID: <4635F6BD.7070301@btinternet.com>

I thought wheel balancing was done with zinc weights now.

Although I think you can still use lead in older vehicles because of the 
limited space for the larger weights.

Tony


From harrybissell at copper.net  Mon Apr 30 16:14:33 2007
From: harrybissell at copper.net (harrybissell at copper.net)
Date: Mon, 30 Apr 2007 14:14:33 -0000
Subject: [sdiy] Newbie power connector problem
Message-ID: <380-22007413014143313@copper.net>

The Tom Gamble boards are .150" (not .156")

Tom used headers with round pins that fit OK as far
as he was concerned. I used square pins and they don't fit well.

I drill out his boards to make the holes a little sloppy, and twist
the capacitor leads around the posts (there are usually two tantalum
or electrolytic caps on either side of the header.

H^) harry


>
>
>
>---- Original Message ----
>From: secoff at execpc.com
>To: synth-diy at dropmix.xs4all.nl
>Subject: RE: [sdiy] Newbie power connector problem
>Date: Fri, 27 Apr 2007 20:57:46 -0500
>
>>Hi All...
>>
>>Sorry in advance for the newbie question.
>>
>>I've been building some modules lately which don't have a spot for a
>. 
>>156" connector. So, I've been simply soldering the power leads  
>>directly to the board. This works o.k., but even with great care,  
>>with slight flexing, the cables snap. So... I'm looking for a better
> 
>>way to connect power. To be specific, I'm building boards by Mr. Ray
> 
>>Wilson, and Mr. Tom Gamble, and a couple of other designers. The  
>>boards by Mr. Gamble were designed to accommodate a .156" connector,
> 
>>but the mounting holes are off by just enough that a .156" connector
> 
>>won't fit, regardless of how much 'persuading' it receives. The  
>>boards by Mr. Wilson were not designed to accept .156" connectors. I
> 
>>don't fault either designer, I'm just looking for some advice about 
>
>>how I can improve my construction methods.
>>
>>Thanks in advance for the help.
>>
>>Sam E.
>>_______________________________
>>Sam Ecoff
>>Tanner/Monagle
>>1120 N. Market St.
>>Milwaukee, WI 53202
>>(414) 727-8190
>>www.samecoff.com
>>
>>
>>_______________________________________________
>>Synth-diy mailing list
>>Synth-diy at dropmix.xs4all.nl
>>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy





From jgrisso at det3.net  Mon Apr 30 17:22:15 2007
From: jgrisso at det3.net (Joe Grisso)
Date: Mon, 30 Apr 2007 08:22:15 -0700
Subject: [sdiy] Thoughts on RoHS
In-Reply-To: <027101c78b2e$d5e9bc10$0202a8c0@DELL>
References: <memo.33804@cix.compulink.co.uk>
	<027101c78b2e$d5e9bc10$0202a8c0@DELL>
Message-ID: <864ec6740704300822l6867ae5eib721f81d55306d09@mail.gmail.com>

On 4/30/07, Steve Lenham <lenham at clara.co.uk> wrote:
> From: "Keith Winstanley" <keithw at cix.compulink.co.uk>
>
> > as I cycled in to work today I spotted about 5 lead wheel balance
> > weights on the roads; probably more lead that in all my modulars.
> > What's this RoHS actually achieving apart from suppression on small
> > scale industry?
>
> No offence (and apologies that this has little to do with SDIY), but that is
> the classic excuse for inaction on any tricky subject nowadays - "Because we
> can't achieve perfection instantly, we shouldn't bother making any
> improvements at all".
>
> Most progress inconveniences somebody. Back in the 1800s, somebody probably
> said:
>
> "As I took the carriage to work today, I spotted about five ragged African
> fellows shining shoes for a pittance; probably more than I ever had working
> on my farm. What's this ban on slavery actually achieving apart from
> suppression of small scale industry"

    Cute. I love that analogy! I keep wondering what all the hubbub is
over RoHS vs. non-RoHS components, other than folks having to kit out
their workshop and parts bins again with non-leaded material and
change out a soldering tip. I've found that the transition to RoHS is
fairly easily managed, unless some unobtanium is involved (CEMs,
etc.). At work, RoHS adds a little more paperwork, but in essence it's
nothing more than a "This product complies with RoHS guidelines, blah
blah blah" disclaimer and a detailed BOM of all the parts that go into
the product should an audit be performed. As long as all the raw
materials coming in are RoHS compliant, the final product is too.
     The largest impact I've directly dealt with is managing our
soldering stations during the transition. We literally had to have a
"red" station, where everything was leaded and had the lower
temperature settings, and a "green" station that soldered at higher
temps and had non-leaded solder and rework tools. This wasn't for
compliance, but merely because if you used the RoHS irons on some
non-RoHS chips you'd break the wire bonding inside some ICs and
components due to the increased temperature needed to solder with SnAg
rather than PbSn.
     I also keep a minimum of parts on hand in my home workshop, so
going RoHS isn't a big financial outlay for me. I did the same thing
at work - got new soldering tools (amounted to a different tip for my
metcal, a new solder spool, desolder pump, and solder wick) and was
ready to go.

So, where's the complication again? I'm doing fine with regards to
RoHS, and I've got 2-3 products coming out this year.

Best Regards,

Joe Grisso
Detachment 3 Engineering


From tim.parkhurst at gmail.com  Mon Apr 30 17:36:19 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Mon, 30 Apr 2007 08:36:19 -0700
Subject: [sdiy] Thoughts on RoHS
In-Reply-To: <4635F6BD.7070301@btinternet.com>
References: <memo.33804@cix.compulink.co.uk>
	<027101c78b2e$d5e9bc10$0202a8c0@DELL>
	<4635F6BD.7070301@btinternet.com>
Message-ID: <87441170704300836g18f3723dg909c1fa1fffd0ada@mail.gmail.com>

On 4/30/07, Oakley Sound <tonyallgood at btinternet.com> wrote:
> I thought wheel balancing was done with zinc weights now.
>
> Although I think you can still use lead in older vehicles because of the
> limited space for the larger weights.
>
> Tony
>

Depleted uranium might be a good solution for wheel balancing weights.
About as dense as lead, and easily available from military surplus
sales.

;-)


Tim (wondering if uranium is prohibited by ROHS) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From plutonique9 at hotmail.com  Mon Apr 30 17:42:48 2007
From: plutonique9 at hotmail.com (Plutoniq9 )
Date: Mon, 30 Apr 2007 15:42:48 +0000
Subject: [sdiy] DR-220 A/E Schematic ??
Message-ID: <BAY129-F13CAF86279F108586EAED3E24C0@phx.gbl>

Hi,

I don't suppose anyone here on the list has the DR-220 service manual (or 
schematic)?

Thanks in advance :)

Ryan

_________________________________________________________________
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From aym-htnys at teaser.fr  Mon Apr 30 18:27:34 2007
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Mon, 30 Apr 2007 18:27:34 +0200
Subject: [sdiy] siel mono
In-Reply-To: <731526.59590.qm@web58412.mail.re3.yahoo.com>
References: <731526.59590.qm@web58412.mail.re3.yahoo.com>
Message-ID: <20070430162734.GA2505@vulcain.knox.com>

On 2007-04-30 03:24 -0700, jo cool wrote:

> Anyone know anything about the siel mono

I have one.

> I have one ,but sound output is becoming very erratic
> and uncontrolable

The schemos are online but could it be just an intermittent
contact ?

-- 
Andr? Majorel <URL:http://www.teaser.fr/~amajorel/>
Do not use this account for regular correspondence.
See the URL above for contact information.


From jonathan_science at hotmail.com  Mon Apr 30 19:27:50 2007
From: jonathan_science at hotmail.com (J P)
Date: Mon, 30 Apr 2007 13:27:50 -0400
Subject: [sdiy] source for thumbwheel switches?
Message-ID: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>

A man has a cool synthesizer called the Borgfotron...  some of you might 
have heard of this? ;-)

He used some nifty thumbwheel pushbuttons on that synth.

I would like to employ something similar....  but all the pushbuttons I can 
find are for digital systems...  I would prefer to use analogue routing as I 
haven't the understanding of a digital system that would function that way, 
nor do I want to try to figure that out...

Anybody know where those are sold?

Jonathan P.

_________________________________________________________________
Exercise your brain! Try Flexicon. 
http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07



From tim.parkhurst at gmail.com  Mon Apr 30 20:24:19 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Mon, 30 Apr 2007 11:24:19 -0700
Subject: [sdiy] source for thumbwheel switches?
In-Reply-To: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
References: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
Message-ID: <87441170704301124y9246fa8r3a361cb02b4d60df@mail.gmail.com>

On 4/30/07, J P <jonathan_science at hotmail.com> wrote:
> A man has a cool synthesizer called the Borgfotron...  some of you might
> have heard of this? ;-)
>
> He used some nifty thumbwheel pushbuttons on that synth.
>
> I would like to employ something similar....  but all the pushbuttons I can
> find are for digital systems...  I would prefer to use analogue routing as I
> haven't the understanding of a digital system that would function that way,
> nor do I want to try to figure that out...
>
> Anybody know where those are sold?
>
> Jonathan P.
>

Hi Jonathan,

Yes, I think most of us have heard of the Bergfotron. Nice synth, and
very interesting hardware.
http://hem.bredband.net/bersyn/

Off the top of my head, I think what Jorgen is doing is using
thumbwheel switches that put out a binary count (BCD), and then that
binary number is used to control an analog multiplexer. This
multiplexer is basically a chip that contains switches designed for
routing analog signals. A common analog multiplexer used in synths is
the 4051.
http://www.fairchildsemi.com/pf/CD/CD4051BC.html

This chip has 1 input and 8 outputs. A three-digit binary number
controls which output is connected to the input. NOTE that most analog
switches and multiplexers are bidirectional, so the signal can flow
either way. In other words, the 4051 can be used as a 1 in / 8 out, or
as a 1 out / 8 in.

So to sum it up, you use a BCD thumbwheel switch to control an analog
switch. You do have to be careful, as the 4051 and other "4000" series
analog switches will only handle +/-7.5V signals, but there are other
high-voltage analog switches that will handle the +/-10V signals that
modular synths sometimes see (look for "DG" series high voltage analog
switches).

Hope this helps.


Tim (all thumbs, but no thumbwheels) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From louis at dompselaar.org  Mon Apr 30 21:22:12 2007
From: louis at dompselaar.org (Louis van Dompselaar)
Date: Mon, 30 Apr 2007 21:22:12 +0200
Subject: [sdiy] DR-220 A/E Schematic ??
In-Reply-To: <BAY129-F13CAF86279F108586EAED3E24C0@phx.gbl>
References: <BAY129-F13CAF86279F108586EAED3E24C0@phx.gbl>
Message-ID: <463641E4.4020603@dompselaar.org>

If you find anything, I'd be interested as well!

Louis
>
>
> I don't suppose anyone here on the list has the DR-220 service manual 
> (or schematic)?
>
> Thanks in advance :)
>
> Ryan
>



From jonathan_science at hotmail.com  Mon Apr 30 21:23:12 2007
From: jonathan_science at hotmail.com (J P)
Date: Mon, 30 Apr 2007 15:23:12 -0400
Subject: [sdiy] source for thumbwheel switches?
In-Reply-To: <46364366.1060601@imt.net>
Message-ID: <BAY111-F83D14251D4B445E03EA92FD4C0@phx.gbl>

http://www.datexusa.com/cnkthumbwheel.html

>From the data sheets it looks like Unimax SF12 or SF52 would do the trick.  
SF12 being ten positions, one pole and sf 52 being 16 positions and one 
pole....

I asked him like eight years ago and I could have sworn that the borgfotron 
was actually using analogue switching in there without relays or 
multiplexing or anything..

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From sounddoctorin at imt.net  Mon Apr 30 21:28:38 2007
From: sounddoctorin at imt.net (Bob Weigel)
Date: Mon, 30 Apr 2007 12:28:38 -0700
Subject: [sdiy] source for thumbwheel switches?
In-Reply-To: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
References: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
Message-ID: <46364366.1060601@imt.net>

I think I have a few of....Unimax type SF12 they say.  These are 
thumbwheel 10 positions (0-9) switches with Common and 0-9 gold plated 
card edge connection on back and they're stackable for making a numeric 
display on a panel old-skool style :-) .  I'm not really sure what you 
mean by thumbwheel pushbuttons though.  -Bob

J P wrote:

> A man has a cool synthesizer called the Borgfotron...  some of you 
> might have heard of this? ;-)
>
> He used some nifty thumbwheel pushbuttons on that synth.
>
> I would like to employ something similar....  but all the pushbuttons 
> I can find are for digital systems...  I would prefer to use analogue 
> routing as I haven't the understanding of a digital system that would 
> function that way, nor do I want to try to figure that out...
>
> Anybody know where those are sold?
>
> Jonathan P.
>
> _________________________________________________________________
> Exercise your brain! Try Flexicon. 
> http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07 
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>


From jays at aracnet.com  Mon Apr 30 22:24:59 2007
From: jays at aracnet.com (jays at aracnet.com)
Date: Mon, 30 Apr 2007 13:24:59 -0700
Subject: [sdiy] source for thumbwheel switches?
Message-ID: <200704302024.l3UKOxtw023138@sapphire.spiritone.com>

I don't know where to buy these but they use to be quite common on latter day standalone SCSI discs. They would use them as channel sellector switches. Usually they would but out a 4 bit code from 0 to 0xF.

Jay S.


J P wrote:

> A man has a cool synthesizer called the Borgfotron...  some of you might 
> have heard of this? ;-)
> 
> He used some nifty thumbwheel pushbuttons on that synth.
> 
> I would like to employ something similar....  but all the pushbuttons I can 
> find are for digital systems...  I would prefer to use analogue routing as I 
> haven't the understanding of a digital system that would function that way, 
> nor do I want to try to figure that out...
> 
> Anybody know where those are sold?
> 
> Jonathan P.
> 
> _________________________________________________________________
> Exercise your brain! Try Flexicon. 
> http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From tim.parkhurst at gmail.com  Mon Apr 30 23:25:21 2007
From: tim.parkhurst at gmail.com (Tim Parkhurst)
Date: Mon, 30 Apr 2007 14:25:21 -0700
Subject: [sdiy] source for thumbwheel switches?
In-Reply-To: <BAY111-F83D14251D4B445E03EA92FD4C0@phx.gbl>
References: <46364366.1060601@imt.net>
	<BAY111-F83D14251D4B445E03EA92FD4C0@phx.gbl>
Message-ID: <87441170704301425k1328470fnf720b2fb36b05f42@mail.gmail.com>

On 4/30/07, J P <jonathan_science at hotmail.com> wrote:
> http://www.datexusa.com/cnkthumbwheel.html
>
> >From the data sheets it looks like Unimax SF12 or SF52 would do the trick.
> SF12 being ten positions, one pole and sf 52 being 16 positions and one
> pole....
>
> I asked him like eight years ago and I could have sworn that the borgfotron
> was actually using analogue switching in there without relays or
> multiplexing or anything..
>

Oh, I could very easily be wrong on the BCD switch / mux theory. I
just haven't seen any thumbwheel type rotary switches. If small rotary
switches with a thumbwheel-type "display" are available at a
reasonable cost, that would be a MUCH easier way to do routing.


Tim (thought I was wrong once, but I was mistaken) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein


From ebrombaugh at earthlink.net  Mon Apr 30 23:39:35 2007
From: ebrombaugh at earthlink.net (Eric Brombaugh)
Date: Mon, 30 Apr 2007 14:39:35 -0700
Subject: [sdiy] source for thumbwheel switches?
In-Reply-To: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
References: <BAY111-F320E25CB7AC85768A7C4F6FD4C0@phx.gbl>
Message-ID: <46366217.7030509@earthlink.net>

J P wrote:
> A man has a cool synthesizer called the Borgfotron...  some of you might 
> have heard of this? ;-)
> 
> He used some nifty thumbwheel pushbuttons on that synth.
> 
> I would like to employ something similar....  but all the pushbuttons I 
> can find are for digital systems...  I would prefer to use analogue 
> routing as I haven't the understanding of a digital system that would 
> function that way, nor do I want to try to figure that out...
> 
> Anybody know where those are sold?

Try Digi-Key:

http://www.digikey.com

Search for 'thumbwheel switch' and get > 200 choices, or type in part # 
CKN5029-ND for a good example of the C&K 3P series. They're ~$8/each 
though, and you'll probably want the matching end-caps and other 
mounting hardware which adds more expense.

Eric


From neil.johnson97 at ntlworld.com  Mon Apr 30 23:56:37 2007
From: neil.johnson97 at ntlworld.com (Neil Johnson)
Date: Mon, 30 Apr 2007 22:56:37 +0100
Subject: [sdiy] Clearout: more synth-related goodies
Message-ID: <1272AEEF-86F9-4E80-B7BF-12EB07EDC063@ntlworld.com>

Yet more victims of the onslaught:

I have three 6U high rack subframes, which are split into two 3U  
rows.  Suitable for Doepfer, Analogue Systems, etc, modules.   
Equivalent to Analogue Systems' RS15 case.  They are used, ex- 
equipment, so have some sticky labels and other stuck to them.  But  
they should clean up nicely (orbital sander and fine-grit paper).   
Will flat-pack for posting.  Free + postage.

Philips CoolRunner XPLA development kit.  Neat low-power programmable  
logic kit - so low power it can run off a lemon battery!  Demo board  
has 128-macrocell device, LCD display, oscillator, patch area.   
Includes parallel port programming cable, datasheets and CDROMs with  
design software.  Unopened, so not sure if it will work on XP or  
Vista.  Free + postage.

First offer on each item secures.  All postage costs to be covered by  
takers.  Collection possible from Cambridge, UK.  I _will_ ship  
worldwide, but note that international postage is not cheap (e.g. 3kg  
surface mail to USA costs about $70).

One result of all this sorting out is I've finally unearthed one  
corner of the bench.  Hopefully this trend will continue and one day  
(fervent hope) there'll be room to get on with the Seil Op6 that's  
waiting for rebuild ... once the TV/hifi support frame has been  
welded together ... and the lounge redecorated.

Cheers,
Neil
--
http://www.njohnson.co.uk





