From lanterma at ece.gatech.edu  Thu Jan  1 00:34:08 2015
From: lanterma at ece.gatech.edu (Lanterman, Aaron)
Date: Wed, 31 Dec 2014 23:34:08 +0000
Subject: [sdiy] Buchla Music Easel circuit adaptation PCBs NYE sale
Message-ID: <250BB8F5-60E0-4081-A131-0CEF0D7355B1@ece.gatech.edu>

Dear SDIYers,

Long-time readers of this list may recall my side project of creating PCB layouts of bits of circuitry from the Buchla Music Easel, adapting them so they could act as stand-alone synth modules.

I don?t have any of the preamp/envelope detector boards available. But I do have timbre & crossfader boards, balanced modulator boards, and envelope generator boards; and I also have a limited number of pulser and lowpass gate boards available. 

Docs on the boards are here: 

http://users.ece.gatech.edu/~lanterma/buchla/boards

They should be considered advanced projects; I started working on them for my own purposes, and others in the synth DIY community were interested.

If you are interested in building some of these, drop me a line at this lanterma at ece.gatech.edu address and I will send you details. (I just switched computers around when I had to get one repaired and don?t have my alternate e-mail set up in my mail program at the moment, so just use this one for now.) 

A tradition I started a few years ago was to give people free shipping if they ordered by midnight on NYE. I?m getting this note out late, so let?s change it to 6:00 U.S. East coast time on New Years Day. 

Aaaaaaand, I?ll also give everyone $5 off the usual cost timbre & crossfader, balanced modulator, and envelope generator boards ordered in the same time frame (since I have more of those).

- Aaron

From joe.frey at radioles.com  Thu Jan  1 19:11:23 2015
From: joe.frey at radioles.com (Joe Frey)
Date: Thu, 01 Jan 2015 13:11:23 -0500
Subject: [sdiy] Enclosure/frame advice needed.
Message-ID: <54A58DCB.7080401@radioles.com>

Hello all, recently someone posted info on a Threeler here that caught 
my fancy. I want to build one, but don't know how to house it in an 
expandable way. Meaning, I don't know anything about how you guys frame 
your modules. I will use it to modify the output from a bowed bass and 
realize as time goes by I might want to add an lfo for and such, so I'd 
like to know what sort of expandable frames you guys use.
  I recently finished, with lots of help from Harry Bissell Jr., a pitch 
to voltage convertor and envelope follower to generate control voltage. 
That was a closed-end project so to speak, so I knew what I wanted as an 
enclosure. You'll find pics of that here:

http://www.radioles.com/works/bissellizer_complete.jpg


-- 
    (">  <")
    / )   ( \
  ''/ |   / |``
  
"Anything worth doing, is worth doing badly, because it might make it better the next time." --anon

Joe Frey
A.K.A. Bitter Relic of a Bygone Era
joe.frey at radioles.com
http://radioles.com
Chez Judex
http://radioles.com/judex/
Radio Lu-Lu (Internet radio)
http://radioles.com/radiolulu/




From blacet at blacet.com  Thu Jan  1 19:56:01 2015
From: blacet at blacet.com (blacet at blacet.com)
Date: Thu, 1 Jan 2015 10:56:01 -0800
Subject: [sdiy] Enclosure/frame advice needed.
In-Reply-To: <54A58DCB.7080401@radioles.com>
References: <54A58DCB.7080401@radioles.com>
Message-ID: <25ffbd0286cccd34bfadba3e1968295e.squirrel@webmail.blacet.com>

"how to house it in an
> expandable way"

Sounds like the defintion of a Modular system.

Lots of DIY stuff including frames, boxes, power and kits at blacet.com.




> Hello all, recently someone posted info on a Threeler here that caught
> my fancy. I want to build one, but don't know how to house it in an
> expandable way. Meaning, I don't know anything about how you guys frame
> your modules. I will use it to modify the output from a bowed bass and
> realize as time goes by I might want to add an lfo for and such, so I'd
> like to know what sort of expandable frames you guys use.
>   I recently finished, with lots of help from Harry Bissell Jr., a pitch
> to voltage convertor and envelope follower to generate control voltage.
> That was a closed-end project so to speak, so I knew what I wanted as an
> enclosure. You'll find pics of that here:
>
> http://www.radioles.com/works/bissellizer_complete.jpg
>
>
> --
>     (">  <")
>     / )   ( \
>   ''/ |   / |``
>
> "Anything worth doing, is worth doing badly, because it might make it
> better the next time." --anon
>
> Joe Frey
> A.K.A. Bitter Relic of a Bygone Era
> joe.frey at radioles.com
> http://radioles.com
> Chez Judex
> http://radioles.com/judex/
> Radio Lu-Lu (Internet radio)
> http://radioles.com/radiolulu/
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>




From modular at go2.pl  Fri Jan  2 12:09:13 2015
From: modular at go2.pl (Roman Sowa)
Date: Fri, 02 Jan 2015 12:09:13 +0100
Subject: [sdiy] Executing guest synthesizer code on stm32f4
In-Reply-To: <560e979c5f5589104b471f9d50add716@media.mit.edu>
References: <560e979c5f5589104b471f9d50add716@media.mit.edu>
Message-ID: <54A67C59.3050707@go2.pl>

This was already mentioned in another words so far, so I'll just chip in 
with a little analogy to good old DOS. Every (almost?) I/O operations 
was done via software interupts, like INT 15 for example.  That could be 
also done by simple indirect CALL. Every INT points to index table that 
is located at RAM address starting from 0, and each int has its own 
location. Index table is written by OS at startup, so even if OS gets 
upgraded, the user program still calls the same index, even if actual 
subroutine is at different address now.
Before execution, user program loads a few registers or a stack with 
input values, calls the software INT. Results are also stored in 
registers or stack.
Then you provide a list with all available calls and required parameters.

Roman
doing that with 80186 back in 1990's


W dniu 2014-12-30 o 17:16, nvawter pisze:
>
> Hello All!
>
> I made a nice instrument based on the stm32f4 and I want people to be
> able to upload their own synth code into it via microphone.  Has anyone
> got any suggestions for how to do this?
>
> I think in theory the idea is to reserve some space in the linker file
> for the "guest code" (plug-in).  Then, use the main program to listen to
> the microphone, demodulate into the binary, then write the guest binary
> block into flash memory.  Then, have the main program call the guest
> code, leaving all of the sensor variables (such as control voltage, knob
> inputs, patch select knob, etc.) in a magic place, have the synth code
> execute, return a block of data, and have the main program write that to
> the DAC.
>
> Questions I'm having are: how does the guest code know what ram
> locations are available?  Should I statically allocate some RAM for the
> main program and some for the guest program?  How do I use labels in the
> code to jump back and forth between funcions?  E.g. if I write a
> "CV_to_pitch()" function and keep it in the main program, and I want the
> guest code to use that function.  Should I make an intermediate table of
> where those functions are in the flash code, for when they move around,
> creating my own linker in effect?
>
> Has anyone ever done this before?  Are there any reference examples like
> this around?  If anyone has any suggestions/tips/ideas, etc, please let
> me know.
>
> Also, I reached out to the stm32f4 subreddit with the same question, if
> anyone would like to respond there, or read the same request for help
> with different working:
> http://www.reddit.com/r/stm32f4/comments/2qtnsx/how_would_i_do_this_upload_blocks_of_binary_code/
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From geekon at gmail.com  Fri Jan  2 22:03:38 2015
From: geekon at gmail.com (Guy Taylor)
Date: Sat, 3 Jan 2015 08:03:38 +1100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
Message-ID: <614534159174382608@unknownmsgid>

Hi everyone!
My first post after observing for many years... :)

I have been making some eurorack modules lately, all analog which has
been a lot of fun, but now want to try some micro-controller based
stuff. And there are two levels of cpu power i'm considering.

Something simple, like for a CV recorder and something more complex,
like a multi channel audio looper.

I realize there are many options but what do you guys think would be a
good starting point for projects like the two above?

Ideally factoring in:
Chip types/families, ram, flash etc
Built in features: audio io?
Power consumption - the less the better
Maturity of existing libraries for audio etc

I have decades experience with c/c++/c#, so the code doesn't worry me
too much, I really would like to select hardware which is appropriate,
rather than just guessing (i tried some test with netduino boards but
there seemed slow and not great for realtime stuff)

Thanks in advance
Guy


From timr at circuitabbey.com  Fri Jan  2 22:15:07 2015
From: timr at circuitabbey.com (Tim Ressel)
Date: Fri, 2 Jan 2015 21:15:07 +0000 (UTC)
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <614534159174382608@unknownmsgid>
References: <614534159174382608@unknownmsgid>
Message-ID: <377179616.2260245.1420233307469.JavaMail.yahoo@jws100193.mail.ne1.yahoo.com>

Hi Guy,
I've used Atmel AVRs for years. The compiler is free and the chips are cheap and easy to figure out. Atmel also has 32 bit chips if you need more power.

The DSPICs from Microchip are nifty as they are dsp and some at least have audio DACs. And they have some in DIP packages for easy breadboarding. MikroElektronica has some nifty tools for those and many other chips.

I've been looking at the Freescale Kinetis Microcontrollers, specifically the M20 series because they can drive audio codec chips. I think my new FM oscillator will be based on those.
 
Tim Ressel
Circuit Abbey
503-750-9331
timr at circuitabbey.com




________________________________
From: Guy Taylor <geekon at gmail.com>
To: SDIY Mailing Group <synth-diy at dropmix.xs4all.nl> 
Sent: Friday, January 2, 2015 1:03 PM
Subject: [sdiy] Microcontrollers for eurorack use... What to use?


Hi everyone!
My first post after observing for many years... :)

I have been making some eurorack modules lately, all analog which has
been a lot of fun, but now want to try some micro-controller based
stuff. And there are two levels of cpu power i'm considering.

Something simple, like for a CV recorder and something more complex,
like a multi channel audio looper.

I realize there are many options but what do you guys think would be a
good starting point for projects like the two above?

Ideally factoring in:
Chip types/families, ram, flash etc
Built in features: audio io?
Power consumption - the less the better
Maturity of existing libraries for audio etc

I have decades experience with c/c++/c#, so the code doesn't worry me
too much, I really would like to select hardware which is appropriate,
rather than just guessing (i tried some test with netduino boards but
there seemed slow and not great for realtime stuff)

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


From declareupdate at gmail.com  Fri Jan  2 22:53:17 2015
From: declareupdate at gmail.com (Chris McDowell)
Date: Fri, 2 Jan 2015 15:53:17 -0600
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <377179616.2260245.1420233307469.JavaMail.yahoo@jws100193.mail.ne1.yahoo.com>
References: <614534159174382608@unknownmsgid>
	<377179616.2260245.1420233307469.JavaMail.yahoo@jws100193.mail.ne1.yahoo.com>
Message-ID: <BDD9C2B4-BF4C-4EDF-AB7E-0A6FA9DA3E85@gmail.com>

Hey Guy! 

I second the freescale suggestion. The Teensy 3.1 Dev board uses the MK20DX256VLH7, and it?s fairly boss, with USB, fast ADCs and a built in DAC. It benefits hugely from an audio codec, which can be finicky but shouldn?t be too nuts to get one up and running. I?ve done algorithmic reverb and polyphonic FM synth stuff with no problems with this chip. Multichannel looper would be possible with extra storage and an audio codec. 

AVRs are great too. I started with arduinos, eventually making standalone hardware but still using their IDE. They?re fine for most things except audio. The PH01II uses the atmega328, same as the arduinos. 

The tricky part for me at first was making my own hardware after getting stuff working with dev boards. I, and probably others on here, would be happy to help with that step. 

Cheers! 
Chris 


> On Jan 2, 2015, at 3:15 PM, Tim Ressel <timr at circuitabbey.com> wrote:
> 
> Hi Guy,
> I've used Atmel AVRs for years. The compiler is free and the chips are cheap and easy to figure out. Atmel also has 32 bit chips if you need more power.
> 
> The DSPICs from Microchip are nifty as they are dsp and some at least have audio DACs. And they have some in DIP packages for easy breadboarding. MikroElektronica has some nifty tools for those and many other chips.
> 
> I've been looking at the Freescale Kinetis Microcontrollers, specifically the M20 series because they can drive audio codec chips. I think my new FM oscillator will be based on those.
> 
> Tim Ressel
> Circuit Abbey
> 503-750-9331
> timr at circuitabbey.com
> 
> 
> 
> 
> ________________________________
> From: Guy Taylor <geekon at gmail.com>
> To: SDIY Mailing Group <synth-diy at dropmix.xs4all.nl> 
> Sent: Friday, January 2, 2015 1:03 PM
> Subject: [sdiy] Microcontrollers for eurorack use... What to use?
> 
> 
> Hi everyone!
> My first post after observing for many years... :)
> 
> I have been making some eurorack modules lately, all analog which has
> been a lot of fun, but now want to try some micro-controller based
> stuff. And there are two levels of cpu power i'm considering.
> 
> Something simple, like for a CV recorder and something more complex,
> like a multi channel audio looper.
> 
> I realize there are many options but what do you guys think would be a
> good starting point for projects like the two above?
> 
> Ideally factoring in:
> Chip types/families, ram, flash etc
> Built in features: audio io?
> Power consumption - the less the better
> Maturity of existing libraries for audio etc
> 
> I have decades experience with c/c++/c#, so the code doesn't worry me
> too much, I really would like to select hardware which is appropriate,
> rather than just guessing (i tried some test with netduino boards but
> there seemed slow and not great for realtime stuff)
> 
> Thanks in advance
> Guy
> _______________________________________________
> 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 crystals at sonic.net  Sat Jan  3 00:44:43 2015
From: crystals at sonic.net (crystal)
Date: Fri, 02 Jan 2015 15:44:43 -0800
Subject: [sdiy] THAT300
In-Reply-To: <549DE90E.1040407@musictechnologiesgroup.com>
References: <54468F3F.7080103@musictechnologiesgroup.com>	<36B3179C-6442-4103-9F86-61E0572F37DB@icloud.com>	<54471285.1090006@musictechnologiesgroup.com>	<5447503F.8020409@oldcrows.net>
	<549DE90E.1040407@musictechnologiesgroup.com>
Message-ID: <54A72D6B.8060201@sonic.net>

Thanx Tim Ressel for the tip of using a THAT300 for a matched pair. 
Haven't tested my circuit out for tracking accuracy quite just yet but i 
bet it's a significant improvement. my question: what to do with the 
substrate pin?   -V, or perhaps ground?

thanks,
crystal

-- 
http://www.gardenofsensualdelight.com
http://soundcloud.com/user3694125



From music.maker at gte.net  Sat Jan  3 02:03:22 2015
From: music.maker at gte.net (Scott Gravenhorst)
Date: Fri, 02 Jan 2015 17:03:22 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
Message-ID: <54A73FDA.2000500@gte.net>

You mention multi channel audio looper, so I assume you need to input 
audio.  As such, I don't know what sort of quality you're looking for, 
so the information I post here may not be good for your application.

I use the Microchip dsPIC33F, specifically, (for 28 pin DIP DIY) 
dsPIC33FJ128GP802.  This 16 bit device will run up to 40 MIPS and has a 
built in 16 bit delta-sigma stereo DAC capable of sample rates up to 100 
kHz.  The DAC is designed specifically for audio.  The multi-channel 
ADCs can run at either 10 bits or 12 bits and will do much higher sample 
rates.  The dsPIC also has hardware for SPI, UARTs and other interfaces. 
  It's internal SRAM is only 16 kbytes (max).  Low internal memory size 
is the drawback for every microcontroller I've seen so far.  One can use 
SPI to attach more RAMs.  I mention SPI SRAM because your post indicated 
a desire for looping which requires RAM.  Multiple SPI SRAMs can be 
attached and the dsPIC offers 2 internal SPI controllers which operate 
at 10 megabits per second.  The SPI SRAMs I've used are 128 kbyte and 
more than one can be attached to an SPI controller.  The dsPIC33F is 
about $5.50 in singles.  It can be used on stripboard or even on a 
solderless breadboard.

I've done a bit of work with these ICs which includes several MIDI 
polysynths (one of them supports 12 Karplus-Strong voices) so I can 
speak to the fact that they are quite capable.  That synth includes the 
MIDI controller and voice engine in one dsPIC33F.

The tools I use are free (MPLAB).  The C compiler (C30) can be used in 
"free" mode under which optimization is basic unless you pay for a 
license.  Note that the C compiler doesn't utilize the DSP instructions 
(like MAC) even if it could.  I've written one synth in C, but it was 
heavily supported by special assembly language functions I wrote to do 
specific DSP tasks.  To get the most out of this IC, I've found using 
assembly language to be best because then I am the optimizer and I know 
how to use the DSP instructions.

Microchip will ship free samples.  You can request samples on their 
website if you are interested.

Guy Taylor <geekon at gmail.com> wrote:
 >Hi everyone!
 >My first post after observing for many years... :)
 >
 >I have been making some eurorack modules lately, all analog which has
 >been a lot of fun, but now want to try some micro-controller based
 >stuff. And there are two levels of cpu power i'm considering.
 >
 >Something simple, like for a CV recorder and something more complex,
 >like a multi channel audio looper.
 >
 >I realize there are many options but what do you guys think would be a
 >good starting point for projects like the two above?
 >
 >Ideally factoring in:
 >Chip types/families, ram, flash etc
 >Built in features: audio io?
 >Power consumption - the less the better
 >Maturity of existing libraries for audio etc
 >
 >I have decades experience with c/c++/c#, so the code doesn't worry me
 >too much, I really would like to select hardware which is appropriate,
 >rather than just guessing (i tried some test with netduino boards but
 >there seemed slow and not great for realtime stuff)
 >
 >Thanks in advance
 >Guy

-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- http://scott.joviansynth.com/
-- When the going gets tough, the tough use the command line.
-- Matt 21:22


From pfperry at melbpc.org.au  Sat Jan  3 03:19:31 2015
From: pfperry at melbpc.org.au (Paul Perry)
Date: Sat, 3 Jan 2015 13:19:31 +1100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
References: <54A73FDA.2000500@gte.net>
Message-ID: <BLU437-SMTP42EA511884C2B48AB2DFBDFB5A0@phx.gbl>

Scott, (or anyone!) what's the current draw on that Microchip dsPIC33F in 
typical audio use?
Someone told me they are pretty thirsty,but obviously it is very frequency 
dependent.

paul perry Melbourne Australia

----- Original Message ----- 
From: "Scott Gravenhorst"
> I use the Microchip dsPIC33F, specifically, (for 28 pin DIP DIY) 
> dsPIC33FJ128GP802.  This 16 bit device will run up to 40 MIPS and has a 
> built in 16 bit delta-sigma stereo DAC capable of sample rates up to 100 
> kHz.  The DAC is designed specifically for audio. 



From thx1138 at earthlink.net  Sat Jan  3 03:26:35 2015
From: thx1138 at earthlink.net (Terry Shultz)
Date: Fri, 2 Jan 2015 18:26:35 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <BLU437-SMTP42EA511884C2B48AB2DFBDFB5A0@phx.gbl>
References: <54A73FDA.2000500@gte.net>
	<BLU437-SMTP42EA511884C2B48AB2DFBDFB5A0@phx.gbl>
Message-ID: <A3CFC0D3-A858-4FCF-856A-79FC910B7598@earthlink.net>

Hi Folks,

MicroChip, Freescale, ADI and several others have 16bit MCU with DSP.

TI has ARM with DSP and ADI as well.

Free samples are only partly of interest, Tools and Debug modules are all over the pricing Map.

I am presently using a SIGMA dsp from ADI and it gives pretty decent performance.

Freescale 16bit MCU with DSP uses CodeWarrior and that tool can be had cheaply for small memory footprint based devices.

I actually like Keil, ARM and IAR tools better.

It would be nice to get a current matrix of devices for 2015 that are interesting for Hobby level work.

best of regards,

Terry
> On Jan 2, 2015, at 6:19 PM, Paul Perry <pfperry at melbpc.org.au> wrote:
> 
> Scott, (or anyone!) what's the current draw on that Microchip dsPIC33F in typical audio use?
> Someone told me they are pretty thirsty,but obviously it is very frequency dependent.
> 
> paul perry Melbourne Australia
> 
> ----- Original Message ----- From: "Scott Gravenhorst"
>> I use the Microchip dsPIC33F, specifically, (for 28 pin DIP DIY) dsPIC33FJ128GP802.  This 16 bit device will run up to 40 MIPS and has a built in 16 bit delta-sigma stereo DAC capable of sample rates up to 100 kHz.  The DAC is designed specifically for audio. 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From igg.debus at t-online.de  Sat Jan  3 11:03:37 2015
From: igg.debus at t-online.de (Ingo Debus)
Date: Sat, 3 Jan 2015 11:03:37 +0100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <614534159174382608@unknownmsgid>
References: <614534159174382608@unknownmsgid>
Message-ID: <FAF364E4-22AE-4CCE-AD42-D9A4E7080878@t-online.de>


Am 02.01.2015 um 22:03 schrieb Guy Taylor:

> but now want to try some micro-controller based
> stuff

Have you seen this?
http://www.ucapps.de/

Ingo


From jackdamery at hotmail.co.uk  Sat Jan  3 16:39:05 2015
From: jackdamery at hotmail.co.uk (Jack Jackson)
Date: Sat, 3 Jan 2015 15:39:05 +0000
Subject: [sdiy] Buffer +/-5V square wave to 5V for Arduino in?
Message-ID: <DUB123-W405BE932467BA065AD72A5975A0@phx.gbl>

Hi All, I'm working on a synth to MIDI project.

My VCO puts out a +/-5V square wave, I want to read its frequency using the Arduino
digital in pin, but I'm aware it will probably blow it up if I feed it straight in.

How can I buffer it so it becomes a safe 0-5V square wave?

Cheers,
Jack
 		 	   		  

From jacobwatters at gmail.com  Sat Jan  3 16:46:46 2015
From: jacobwatters at gmail.com (Jacob Watters)
Date: Sat, 3 Jan 2015 10:46:46 -0500
Subject: [sdiy] Buffer +/-5V square wave to 5V for Arduino in?
In-Reply-To: <DUB123-W405BE932467BA065AD72A5975A0@phx.gbl>
References: <DUB123-W405BE932467BA065AD72A5975A0@phx.gbl>
Message-ID: <CAKcdib14m7e2vmiQw3_1gRrwsDEWvjmkf80WLKmiH+c6cScKEw@mail.gmail.com>

Passing the square wave through a diode will remove the negative
voltage. I have done that in the past. I usually error on the side of
over buffering and protecting, so I also used shotkey diodes (ground
>| square wave >| +5V) and a voltage follower. However, those last two
are probably not required.

On Sat, Jan 3, 2015 at 10:39 AM, Jack Jackson <jackdamery at hotmail.co.uk> wrote:
> Hi All, I'm working on a synth to MIDI project.
>
> My VCO puts out a +/-5V square wave, I want to read its frequency using the Arduino
> digital in pin, but I'm aware it will probably blow it up if I feed it straight in.
>
> How can I buffer it so it becomes a safe 0-5V square wave?
>
> Cheers,
> Jack
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From rjeancarlo at hotmail.com  Sat Jan  3 16:47:36 2015
From: rjeancarlo at hotmail.com (r- jeancarlo)
Date: Sat, 3 Jan 2015 10:47:36 -0500
Subject: [sdiy] [AH] Buffer +/-5V square wave to 5V for Arduino in?
In-Reply-To: <DUB123-W405BE932467BA065AD72A5975A0@phx.gbl>
References: <DUB123-W405BE932467BA065AD72A5975A0@phx.gbl>
Message-ID: <SNT406-EAS6463D7F7AD51EBB3A34EADCE5A0@phx.gbl>

A diode and a resistor should do the trick.

> On Jan 3, 2015, at 10:39 AM, "Jack Jackson" <jackdamery at hotmail.co.uk> wrote:
> 
> Hi All, I'm working on a synth to MIDI project.
> 
> My VCO puts out a +/-5V square wave, I want to read its frequency using the Arduino
> digital in pin, but I'm aware it will probably blow it up if I feed it straight in.
> 
> How can I buffer it so it becomes a safe 0-5V square wave?
> 
> Cheers,
> Jack
>                         


From music.maker at gte.net  Sat Jan  3 17:18:55 2015
From: music.maker at gte.net (Scott Gravenhorst)
Date: Sat, 03 Jan 2015 08:18:55 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
Message-ID: <54A8166F.4010204@gte.net>

Hi Paul,

I don't have a precise answer for this, however, I've successfully 
powered 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. 
three of the dsPICs were doing audio, one was acting as a MIDI 
controller talking to two of the others as voice engines over SPI.

Judging from the datasheet (70292G.pdf), near the end there are some 
graphs showing current (high and low logic levels) for different numbers 
of IO pins up to 16.  With 16 pins at 3.3v supply, it looks like about 
90mA.  I am assuming this is with the IC running at 40 MIPS (and I don't 
know if this is simply the IO current or if it's total device current - 
there may be more information in the datasheet, I just now took a quick 
look).  The dsPIC also has some power saving features, but I've not used 
them as I'm trying to get as much continuous computing power as possible.

HTH

Paul Perry <pfperry at melbpc.org.au> wrote:
 >Scott, (or anyone!) what's the current draw on that Microchip dsPIC33F 
 >in typical audio use?  Someone told me they are pretty thirsty,but 
 >obviously it is very frequency dependent.
 >
 >paul perry Melbourne Australia
 >
 >----- Original Message -----
 >From: "Scott Gravenhorst"
 >> I use the Microchip dsPIC33F, specifically, (for 28 pin DIP DIY)
 >> dsPIC33FJ128GP802.  This 16 bit device will run up to 40 MIPS and
 >> has a
 >> built in 16 bit delta-sigma stereo DAC capable of sample rates up to
 >> 100
 >> kHz.  The DAC is designed specifically for audio.
 >
 >_______________________________________________
 >Synth-diy mailing list
 >Synth-diy at dropmix.xs4all.nl
 >http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
 >

-- ScottG
________________________________________________________________________
-- Scott Gravenhorst
-- http://scott.joviansynth.com/
-- When the going gets tough, the tough use the command line.
-- Matt 21:22


From nvawter at media.mit.edu  Sat Jan  3 17:57:02 2015
From: nvawter at media.mit.edu (nvawter)
Date: Sat, 03 Jan 2015 11:57:02 -0500
Subject: [sdiy] Executing guest synthesizer code on stm32f4
In-Reply-To: <54A67C59.3050707@go2.pl>
References: <560e979c5f5589104b471f9d50add716@media.mit.edu>
	<54A67C59.3050707@go2.pl>
Message-ID: <8971053bed1dce5e273bb7c30ad3a3c4@media.mit.edu>


Soooooo

first, I want to thank everyone for their brilliant and valuable 
replies, as usual for this list =)

second, one reader sent a suggestion to me directly and I just now 
realized it didn't reach the full list and probably should have!

he suggested I look into Axoloti.  I was delighted, b/c it turns out 
Axoloti started a crowdfunding project *literally* the day before I 
asked my question on this list.

Axoloti is a system where you edit synth modular DSP patches in a java 
app, then press a button and it generates C code, compiles it and 
flashes it into your stm32f4 chip over USB!  Unbelievable!

Also, it works okay with the legendary stm32f4 discovery board, but the 
real platform is the designer (Johannes Talemann)'s hardware board which 
includes MIDI jacks, 24-audio and SD slot.  Also, the whole project is 
open source so if you want to make your own hardware running this 
software, go for it!

Here are some links related to Axoloti:
Crowd-funding campaign, highly recommended, costs about $100 for U.S. , 
less for Europeans (shipping)
https://www.indiegogo.com/projects/axoloti-a-digital-audio-platform-for-makers

Home Page:
http://www.axoloti.be/

My page where I talk in further detail about why I think this is an 
important project:
http://diydsp.com/livesite/pages/axoloti


-Noah!


On 2015-01-02 06:09, Roman Sowa wrote:
> This was already mentioned in another words so far, so I'll just chip
> in with a little analogy to good old DOS. Every (almost?) I/O
> operations was done via software interupts, like INT 15 for example.
> That could be also done by simple indirect CALL. Every INT points to
> index table that is located at RAM address starting from 0, and each
> int has its own location. Index table is written by OS at startup, so
> even if OS gets upgraded, the user program still calls the same index,
> even if actual subroutine is at different address now.
> Before execution, user program loads a few registers or a stack with
> input values, calls the software INT. Results are also stored in
> registers or stack.
> Then you provide a list with all available calls and required 
> parameters.
> 
> Roman
> doing that with 80186 back in 1990's
> 
> 
> W dniu 2014-12-30 o 17:16, nvawter pisze:
>> 
>> Hello All!
>> 
>> I made a nice instrument based on the stm32f4 and I want people to be
>> able to upload their own synth code into it via microphone.  Has 
>> anyone
>> got any suggestions for how to do this?
>> 
>> I think in theory the idea is to reserve some space in the linker file
>> for the "guest code" (plug-in).  Then, use the main program to listen 
>> to
>> the microphone, demodulate into the binary, then write the guest 
>> binary
>> block into flash memory.  Then, have the main program call the guest
>> code, leaving all of the sensor variables (such as control voltage, 
>> knob
>> inputs, patch select knob, etc.) in a magic place, have the synth code
>> execute, return a block of data, and have the main program write that 
>> to
>> the DAC.
>> 
>> Questions I'm having are: how does the guest code know what ram
>> locations are available?  Should I statically allocate some RAM for 
>> the
>> main program and some for the guest program?  How do I use labels in 
>> the
>> code to jump back and forth between funcions?  E.g. if I write a
>> "CV_to_pitch()" function and keep it in the main program, and I want 
>> the
>> guest code to use that function.  Should I make an intermediate table 
>> of
>> where those functions are in the flash code, for when they move 
>> around,
>> creating my own linker in effect?
>> 
>> Has anyone ever done this before?  Are there any reference examples 
>> like
>> this around?  If anyone has any suggestions/tips/ideas, etc, please 
>> let
>> me know.
>> 
>> Also, I reached out to the stm32f4 subreddit with the same question, 
>> if
>> anyone would like to respond there, or read the same request for help
>> with different working:
>> http://www.reddit.com/r/stm32f4/comments/2qtnsx/how_would_i_do_this_upload_blocks_of_binary_code/
>> 
>> _______________________________________________
>> 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 tprivitera at nc.rr.com  Sat Jan  3 19:34:41 2015
From: tprivitera at nc.rr.com (tprivitera at nc.rr.com)
Date: Sat, 3 Jan 2015 18:34:41 +0000
Subject: [sdiy] Looking for OB-X voice cards and tray for expansion
Message-ID: <20150103183441.3EY3B.103821.root@cdptpa-web06>

Hi All,

I'm looking for a couple of OB-X voice cards the upper motherboard tray and stand-off hardware to expand my OB-X from a 4-voice to at least a 6-voice.

Does anybody have any of these a be willing to part with?

Anybody have any experience doing this that they could share?

Thanks in advance!

Tim


From pfperry at melbpc.org.au  Sun Jan  4 00:42:44 2015
From: pfperry at melbpc.org.au (Paul Perry)
Date: Sun, 4 Jan 2015 10:42:44 +1100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
References: <54A8166F.4010204@gte.net>
Message-ID: <BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>

Thanks Scott, that is is line with what a friend said, he had
 single one taking 200mA (non-music application, but flat out.)

paul perry Melbourne Australia

----- Original Message ----- 
From: "Scott Gravenhorst"Subject: Re: [sdiy] Microcontrollers for eurorack 
use... What to use?
> I don't have a precise answer for this, however, I've successfully powered 
> 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. three of the 
> dsPICs were doing audio, one was acting as a MIDI controller talking to 
> two of the others as voice engines over SPI.
>



From rsdio at audiobanshee.com  Sun Jan  4 01:41:18 2015
From: rsdio at audiobanshee.com (rsdio at audiobanshee.com)
Date: Sat, 3 Jan 2015 16:41:18 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <54A73FDA.2000500@gte.net>
References: <54A73FDA.2000500@gte.net>
Message-ID: <219B4D3B-76CF-412B-98D3-5E115EEAE1D5@audiobanshee.com>

Guy,

There are many choices. You'll want DMA for the audio looper, or specialized sampler chips. I recommend against on-board audio (analog domain), but you certainly want digital audio streaming (SPI or I2S). USB support will probably come in handy.

The XMOS chips have multiple cores, and supposedly allow quick response to multiple inputs (USB, front-panel buttons, CV inputs), but you have to handle most of the peripherals in software using their powerful hardware building blocks (a little like FPGA, but less difficult). They can support digital audio streams for the A/D and D/A, but it's software protocols with hardware support. The USB is fully hardware. XMOS has developer platforms that are geared towards audio, so check out their DJ and audio developer kits. It can be easier to write the separate core programs because each deals with a single input and/or output.

The MSP430 is extremely low power, but easy to program. Not suited for DSP.

I like the TMS320 C5000 series for the combination of low-power, USB support, and very powerful DSP on a single chip.

The PIC and AVR are roughly equivalent in price and capabilities. Their assembly languages are completely different, though. The PIC offers more options to fine-tune the cost of the chip based on feature combinations, but in your quantities that might not matter. The AVR is more popular due to the Arduino.

Your C/C++ experience will come in handy, but I'm almost certain that you'll need to learn some assembly for any chip that you select. That's because the low-power embedded world usually requires a little optimization here and there, especially for interrupt processing, audio signal processing, or anything that's really doing a lot of calculations and/or needs to response quickly.

Brian Willoughby
Sound Consulting


Guy Taylor <geekon at gmail.com> wrote:
> Hi everyone!
> My first post after observing for many years... :)
> 
> I have been making some eurorack modules lately, all analog which has
> been a lot of fun, but now want to try some micro-controller based
> stuff. And there are two levels of cpu power i'm considering.
> 
> Something simple, like for a CV recorder and something more complex,
> like a multi channel audio looper.
> 
> I realize there are many options but what do you guys think would be a
> good starting point for projects like the two above?
> 
> Ideally factoring in:
> Chip types/families, ram, flash etc
> Built in features: audio io?
> Power consumption - the less the better
> Maturity of existing libraries for audio etc
> 
> I have decades experience with c/c++/c#, so the code doesn't worry me
> too much, I really would like to select hardware which is appropriate,
> rather than just guessing (i tried some test with netduino boards but
> there seemed slow and not great for realtime stuff)
> 
> Thanks in advance
> Guy



From ol.gillet at gmail.com  Sun Jan  4 02:20:58 2015
From: ol.gillet at gmail.com (Olivier Gillet)
Date: Sun, 4 Jan 2015 02:20:58 +0100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
Message-ID: <CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>

I've been using the STM32F4s in two modules I have recently announced
(Elements and Clouds), and have three more down in the pipe. I love
working with these for the following reasons:
* Easy to code with, using open-source tools (gcc-arm-none-eabi and
gdb) and a classic CLI/editor workflow.
* Relatively easy to interface with an audio codec IC.
* Code execution from flash is fast (unlike the STM32F1...).
* 32-bit floating point unit with fused multiply-add, hardware
division, square root and absolute value.
* GCC generates very good quality code from C/C++. We're reaping the
benefits of the popularity of ARM and the collective effort spent on
compilers...
* Lots of flash memory.
* Low power consumption. A complete module (MCU + Codec + op-amps for
audio and CV conditioning + blinkenlights) for 100mA.

A few caveats:
* Small amount of internal SRAM (192kb on STM32F407, 256kb on STM32F427).
* Internal ADC needs software processing (averaging/low-pass
filtering) to get decent resolution. Certainly not for audio, OK for
CVs in the low kHz rate.
* I2S clock is always 256fs, which can be a problem with some codecs
to reach some sample rates.

I haven't tested the external memory interface - the STM32F429 has a
controller for SDRAM which might be a good option for your looper
(older parts only support SRAM).

For synthesis applications, one can get a lot of work done. In my
modules or through benchmarks, I got them to run:
* ~100 zero-delay SVF at 48kHz.
* ~100 basic wavetable oscillators at 48kHz.
* A 16-band vocoder and several wavetable oscillators at 48kHz (lower
bands downsampled to 8kHz).
* 8x 4-op FM voices with oversampling at 96kHz.
* A mono phase-vocoder with 25% overlapping at 48kHz.
* Waveshaping/wavefolding/ringmod algorithms at 96kHz with 8x
oversampling (768kHz).
* A simple reverb (a dozen APs, 2-3 modulated delays/APs) uses 10% of
the CPU at 48kHz.

All of these were from C++ code - but I studied the generated machine
code carefully and very rarely found inefficiencies.

On Sun, Jan 4, 2015 at 12:42 AM, Paul Perry <pfperry at melbpc.org.au> wrote:
> Thanks Scott, that is is line with what a friend said, he had
> single one taking 200mA (non-music application, but flat out.)
>
> paul perry Melbourne Australia
>
> ----- Original Message ----- From: "Scott Gravenhorst"Subject: Re: [sdiy]
> Microcontrollers for eurorack use... What to use?
>>
>> I don't have a precise answer for this, however, I've successfully powered
>> 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. three of the
>> dsPICs were doing audio, one was acting as a MIDI controller talking to two
>> of the others as voice engines over SPI.
>>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From mec.forumreader at gmail.com  Sun Jan  4 03:10:13 2015
From: mec.forumreader at gmail.com (Michael E Caloroso)
Date: Sat, 3 Jan 2015 21:10:13 -0500
Subject: [sdiy] Looking for OB-X voice cards and tray for expansion
In-Reply-To: <20150103183441.3EY3B.103821.root@cdptpa-web06>
References: <20150103183441.3EY3B.103821.root@cdptpa-web06>
Message-ID: <CAAv6=UCWHTeT=UX1KtMukWZLBQaGfGXxSG+bbLDxwGc7xVQtkQ@mail.gmail.com>

Google crowbx.

Scott "old crow" Rider has cloned the voice cards and has made a
limited set of new motherboard cards.

If you are lucky enough to find the motherboard but it is the lower
one (pan pots labeled 1-4 not 5-8), they are the same board as the
upper one with the voice summing circuitry omitted.

MC

On 1/3/15, tprivitera at nc.rr.com <tprivitera at nc.rr.com> wrote:
> Hi All,
>
> I'm looking for a couple of OB-X voice cards the upper motherboard tray and
> stand-off hardware to expand my OB-X from a 4-voice to at least a 6-voice.
>
> Does anybody have any of these a be willing to part with?
>
> Anybody have any experience doing this that they could share?
>
> Thanks in advance!
>
> Tim
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From declareupdate at gmail.com  Sun Jan  4 03:10:41 2015
From: declareupdate at gmail.com (Chris McDowell)
Date: Sat, 3 Jan 2015 20:10:41 -0600
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
Message-ID: <67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>

Olivier, how would you suggest one get started with the STM32 chips? I?ve always stuck to what I could accomplish within the Arduino IDE, but would really love to ?level up?. I bought one of the mbed-enabled nucleo dev boards from ST and really enjoy the extra horsepower, but I don?t want to rely on the mbed environment for developing any actual products. A nudge in the right direction would be much appreciated! :) 



> On Jan 3, 2015, at 7:20 PM, Olivier Gillet <ol.gillet at gmail.com> wrote:
> 
> I've been using the STM32F4s in two modules I have recently announced
> (Elements and Clouds), and have three more down in the pipe. I love
> working with these for the following reasons:
> * Easy to code with, using open-source tools (gcc-arm-none-eabi and
> gdb) and a classic CLI/editor workflow.
> * Relatively easy to interface with an audio codec IC.
> * Code execution from flash is fast (unlike the STM32F1...).
> * 32-bit floating point unit with fused multiply-add, hardware
> division, square root and absolute value.
> * GCC generates very good quality code from C/C++. We're reaping the
> benefits of the popularity of ARM and the collective effort spent on
> compilers...
> * Lots of flash memory.
> * Low power consumption. A complete module (MCU + Codec + op-amps for
> audio and CV conditioning + blinkenlights) for 100mA.
> 
> A few caveats:
> * Small amount of internal SRAM (192kb on STM32F407, 256kb on STM32F427).
> * Internal ADC needs software processing (averaging/low-pass
> filtering) to get decent resolution. Certainly not for audio, OK for
> CVs in the low kHz rate.
> * I2S clock is always 256fs, which can be a problem with some codecs
> to reach some sample rates.
> 
> I haven't tested the external memory interface - the STM32F429 has a
> controller for SDRAM which might be a good option for your looper
> (older parts only support SRAM).
> 
> For synthesis applications, one can get a lot of work done. In my
> modules or through benchmarks, I got them to run:
> * ~100 zero-delay SVF at 48kHz.
> * ~100 basic wavetable oscillators at 48kHz.
> * A 16-band vocoder and several wavetable oscillators at 48kHz (lower
> bands downsampled to 8kHz).
> * 8x 4-op FM voices with oversampling at 96kHz.
> * A mono phase-vocoder with 25% overlapping at 48kHz.
> * Waveshaping/wavefolding/ringmod algorithms at 96kHz with 8x
> oversampling (768kHz).
> * A simple reverb (a dozen APs, 2-3 modulated delays/APs) uses 10% of
> the CPU at 48kHz.
> 
> All of these were from C++ code - but I studied the generated machine
> code carefully and very rarely found inefficiencies.
> 
> On Sun, Jan 4, 2015 at 12:42 AM, Paul Perry <pfperry at melbpc.org.au> wrote:
>> Thanks Scott, that is is line with what a friend said, he had
>> single one taking 200mA (non-music application, but flat out.)
>> 
>> paul perry Melbourne Australia
>> 
>> ----- Original Message ----- From: "Scott Gravenhorst"Subject: Re: [sdiy]
>> Microcontrollers for eurorack use... What to use?
>>> 
>>> I don't have a precise answer for this, however, I've successfully powered
>>> 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. three of the
>>> dsPICs were doing audio, one was acting as a MIDI controller talking to two
>>> of the others as voice engines over SPI.
>>> 
>> 
>> _______________________________________________
>> 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 ol.gillet at gmail.com  Sun Jan  4 03:55:30 2015
From: ol.gillet at gmail.com (Olivier Gillet)
Date: Sun, 4 Jan 2015 03:55:30 +0100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
Message-ID: <CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>

Hi Chris,

> Olivier, how would you suggest one get started with the STM32 chips?

My preferred way of programming is with a text editor and a command
line (invoking make, debugging with gdb, processing data/traces
produced by programs in a python shell). Mostly because I test a lot
of functionality by running the code on my own machine rather than on
the target hardware. It might not be to everybody's taste and is much
easier to practice on OS X or Linux. There are solutions (cygwin) to
get a similar environment on Windows - though I don't know how
practical it is. If you aren't already, get familiar with all this
stuff - the command line, makefiles, invoking a compiler from the
command line, writing a simple C "hello world" program (for your own
machine, not for an embedded target) and compiling it from a makefile.

Then I see several options:

* I personally started with this dev board ->
https://www.olimex.com/Products/ARM/ST/STM32-H103/ and an Olimex JTAG
programmer -> https://www.olimex.com/Products/ARM/JTAG/ARM-USB-OCD-H/
. My makefiles / programming scripts are there ->
https://github.com/pichenettes/stmlib ; and i have blink for F1 and F4
here -> https://github.com/pichenettes/stmlib-examples

* Get an STM32F4 Discovery board, compile your programs from the
command line and use ST-link to upload it to the discovery board
(http://jeremyherbert.net/get/stm32f4_getting_started). There are a
few synth projects for this board and minimal external hardware
(https://github.com/MrBlueXav/ambiantiseur).

* Sounds like bad advertising, but you could do worse than get one of
my Eurorack products (For F1: Yarns, Peaks, Tides, Frames, Braids,
Streams ; for F4: Clouds, Elements), an USB<->FTDI cable or a JTAG
box. The way the code is built and sent to the device is explained
here (http://mutable-instruments.net/modules/tides/open). Try hacking
the code, see how things are done... This might be helpful if the
thing you want to build has similar I/O requirements as one of my
products.

* Similarly, you could get the OWL pedal http://hoxtonowl.com/ and
hack at it (https://github.com/pingdynasty/OwlWare)

Best,
Olivier

On Sun, Jan 4, 2015 at 3:10 AM, Chris McDowell <declareupdate at gmail.com> wrote:
> Olivier, how would you suggest one get started with the STM32 chips? I?ve always stuck to what I could accomplish within the Arduino IDE, but would really love to ?level up?. I bought one of the mbed-enabled nucleo dev boards from ST and really enjoy the extra horsepower, but I don?t want to rely on the mbed environment for developing any actual products. A nudge in the right direction would be much appreciated! :)
>
>
>
>> On Jan 3, 2015, at 7:20 PM, Olivier Gillet <ol.gillet at gmail.com> wrote:
>>
>> I've been using the STM32F4s in two modules I have recently announced
>> (Elements and Clouds), and have three more down in the pipe. I love
>> working with these for the following reasons:
>> * Easy to code with, using open-source tools (gcc-arm-none-eabi and
>> gdb) and a classic CLI/editor workflow.
>> * Relatively easy to interface with an audio codec IC.
>> * Code execution from flash is fast (unlike the STM32F1...).
>> * 32-bit floating point unit with fused multiply-add, hardware
>> division, square root and absolute value.
>> * GCC generates very good quality code from C/C++. We're reaping the
>> benefits of the popularity of ARM and the collective effort spent on
>> compilers...
>> * Lots of flash memory.
>> * Low power consumption. A complete module (MCU + Codec + op-amps for
>> audio and CV conditioning + blinkenlights) for 100mA.
>>
>> A few caveats:
>> * Small amount of internal SRAM (192kb on STM32F407, 256kb on STM32F427).
>> * Internal ADC needs software processing (averaging/low-pass
>> filtering) to get decent resolution. Certainly not for audio, OK for
>> CVs in the low kHz rate.
>> * I2S clock is always 256fs, which can be a problem with some codecs
>> to reach some sample rates.
>>
>> I haven't tested the external memory interface - the STM32F429 has a
>> controller for SDRAM which might be a good option for your looper
>> (older parts only support SRAM).
>>
>> For synthesis applications, one can get a lot of work done. In my
>> modules or through benchmarks, I got them to run:
>> * ~100 zero-delay SVF at 48kHz.
>> * ~100 basic wavetable oscillators at 48kHz.
>> * A 16-band vocoder and several wavetable oscillators at 48kHz (lower
>> bands downsampled to 8kHz).
>> * 8x 4-op FM voices with oversampling at 96kHz.
>> * A mono phase-vocoder with 25% overlapping at 48kHz.
>> * Waveshaping/wavefolding/ringmod algorithms at 96kHz with 8x
>> oversampling (768kHz).
>> * A simple reverb (a dozen APs, 2-3 modulated delays/APs) uses 10% of
>> the CPU at 48kHz.
>>
>> All of these were from C++ code - but I studied the generated machine
>> code carefully and very rarely found inefficiencies.
>>
>> On Sun, Jan 4, 2015 at 12:42 AM, Paul Perry <pfperry at melbpc.org.au> wrote:
>>> Thanks Scott, that is is line with what a friend said, he had
>>> single one taking 200mA (non-music application, but flat out.)
>>>
>>> paul perry Melbourne Australia
>>>
>>> ----- Original Message ----- From: "Scott Gravenhorst"Subject: Re: [sdiy]
>>> Microcontrollers for eurorack use... What to use?
>>>>
>>>> I don't have a precise answer for this, however, I've successfully powered
>>>> 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. three of the
>>>> dsPICs were doing audio, one was acting as a MIDI controller talking to two
>>>> of the others as voice engines over SPI.
>>>>
>>>
>>> _______________________________________________
>>> 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 eric at ericframpton.com  Sun Jan  4 04:24:49 2015
From: eric at ericframpton.com (Eric Frampton)
Date: Sat, 3 Jan 2015 22:24:49 -0500
Subject: [sdiy] Rhodes Chroma videos
Message-ID: <3831A2E7-1840-4E17-A47F-7830014750AC@ericframpton.com>

HI all -

My friend Patrick Strawser, as part of an ongoing video series he calls The Keyboardist Blog, just finished cutting together two videos of me giving a quick tour of the Rhodes Chroma - actually two different Chromas - and then two other videos of me demo?ing some sounds. Thought this might be of interest, since there isn't a whole lot of Chroma footage floating around out there.

A link to the Chroma playlist:

http://www.youtube.com/playlist?list=PLsaswloDrl6CQb-Ufo9sCo8Fa7jBaGGBJ

A link to Pat's main Keyboardist Blog page, where you can find me demo?ing a few other keyboards in my pile, as well as his interviews with some other folks:

http://www.youtube.com/user/thekeyboardistblog

Cheers,
Eric



From declareupdate at gmail.com  Sun Jan  4 04:26:58 2015
From: declareupdate at gmail.com (Chris McDowell)
Date: Sat, 3 Jan 2015 21:26:58 -0600
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
Message-ID: <3D4F51C5-222A-40DE-B192-FE3FB6C21EAC@gmail.com>

Thanks, Olivier! These are great pointers. 

I?ll be getting Elements and Clouds in any case, cuz they?re -baller- :)

Cheers, 
Chris


> On Jan 3, 2015, at 8:55 PM, Olivier Gillet <ol.gillet at gmail.com> wrote:
> 
> Hi Chris,
> 
>> Olivier, how would you suggest one get started with the STM32 chips?
> 
> My preferred way of programming is with a text editor and a command
> line (invoking make, debugging with gdb, processing data/traces
> produced by programs in a python shell). Mostly because I test a lot
> of functionality by running the code on my own machine rather than on
> the target hardware. It might not be to everybody's taste and is much
> easier to practice on OS X or Linux. There are solutions (cygwin) to
> get a similar environment on Windows - though I don't know how
> practical it is. If you aren't already, get familiar with all this
> stuff - the command line, makefiles, invoking a compiler from the
> command line, writing a simple C "hello world" program (for your own
> machine, not for an embedded target) and compiling it from a makefile.
> 
> Then I see several options:
> 
> * I personally started with this dev board ->
> https://www.olimex.com/Products/ARM/ST/STM32-H103/ and an Olimex JTAG
> programmer -> https://www.olimex.com/Products/ARM/JTAG/ARM-USB-OCD-H/
> . My makefiles / programming scripts are there ->
> https://github.com/pichenettes/stmlib ; and i have blink for F1 and F4
> here -> https://github.com/pichenettes/stmlib-examples
> 
> * Get an STM32F4 Discovery board, compile your programs from the
> command line and use ST-link to upload it to the discovery board
> (http://jeremyherbert.net/get/stm32f4_getting_started). There are a
> few synth projects for this board and minimal external hardware
> (https://github.com/MrBlueXav/ambiantiseur).
> 
> * Sounds like bad advertising, but you could do worse than get one of
> my Eurorack products (For F1: Yarns, Peaks, Tides, Frames, Braids,
> Streams ; for F4: Clouds, Elements), an USB<->FTDI cable or a JTAG
> box. The way the code is built and sent to the device is explained
> here (http://mutable-instruments.net/modules/tides/open). Try hacking
> the code, see how things are done... This might be helpful if the
> thing you want to build has similar I/O requirements as one of my
> products.
> 
> * Similarly, you could get the OWL pedal http://hoxtonowl.com/ and
> hack at it (https://github.com/pingdynasty/OwlWare)
> 
> Best,
> Olivier
> 
> On Sun, Jan 4, 2015 at 3:10 AM, Chris McDowell <declareupdate at gmail.com> wrote:
>> Olivier, how would you suggest one get started with the STM32 chips? I?ve always stuck to what I could accomplish within the Arduino IDE, but would really love to ?level up?. I bought one of the mbed-enabled nucleo dev boards from ST and really enjoy the extra horsepower, but I don?t want to rely on the mbed environment for developing any actual products. A nudge in the right direction would be much appreciated! :)
>> 
>> 
>> 
>>> On Jan 3, 2015, at 7:20 PM, Olivier Gillet <ol.gillet at gmail.com> wrote:
>>> 
>>> I've been using the STM32F4s in two modules I have recently announced
>>> (Elements and Clouds), and have three more down in the pipe. I love
>>> working with these for the following reasons:
>>> * Easy to code with, using open-source tools (gcc-arm-none-eabi and
>>> gdb) and a classic CLI/editor workflow.
>>> * Relatively easy to interface with an audio codec IC.
>>> * Code execution from flash is fast (unlike the STM32F1...).
>>> * 32-bit floating point unit with fused multiply-add, hardware
>>> division, square root and absolute value.
>>> * GCC generates very good quality code from C/C++. We're reaping the
>>> benefits of the popularity of ARM and the collective effort spent on
>>> compilers...
>>> * Lots of flash memory.
>>> * Low power consumption. A complete module (MCU + Codec + op-amps for
>>> audio and CV conditioning + blinkenlights) for 100mA.
>>> 
>>> A few caveats:
>>> * Small amount of internal SRAM (192kb on STM32F407, 256kb on STM32F427).
>>> * Internal ADC needs software processing (averaging/low-pass
>>> filtering) to get decent resolution. Certainly not for audio, OK for
>>> CVs in the low kHz rate.
>>> * I2S clock is always 256fs, which can be a problem with some codecs
>>> to reach some sample rates.
>>> 
>>> I haven't tested the external memory interface - the STM32F429 has a
>>> controller for SDRAM which might be a good option for your looper
>>> (older parts only support SRAM).
>>> 
>>> For synthesis applications, one can get a lot of work done. In my
>>> modules or through benchmarks, I got them to run:
>>> * ~100 zero-delay SVF at 48kHz.
>>> * ~100 basic wavetable oscillators at 48kHz.
>>> * A 16-band vocoder and several wavetable oscillators at 48kHz (lower
>>> bands downsampled to 8kHz).
>>> * 8x 4-op FM voices with oversampling at 96kHz.
>>> * A mono phase-vocoder with 25% overlapping at 48kHz.
>>> * Waveshaping/wavefolding/ringmod algorithms at 96kHz with 8x
>>> oversampling (768kHz).
>>> * A simple reverb (a dozen APs, 2-3 modulated delays/APs) uses 10% of
>>> the CPU at 48kHz.
>>> 
>>> All of these were from C++ code - but I studied the generated machine
>>> code carefully and very rarely found inefficiencies.
>>> 
>>> On Sun, Jan 4, 2015 at 12:42 AM, Paul Perry <pfperry at melbpc.org.au> wrote:
>>>> Thanks Scott, that is is line with what a friend said, he had
>>>> single one taking 200mA (non-music application, but flat out.)
>>>> 
>>>> paul perry Melbourne Australia
>>>> 
>>>> ----- Original Message ----- From: "Scott Gravenhorst"Subject: Re: [sdiy]
>>>> Microcontrollers for eurorack use... What to use?
>>>>> 
>>>>> I don't have a precise answer for this, however, I've successfully powered
>>>>> 4 dsPICs (28 pin DIP) from a single 1 ampere 3.3volt supply. three of the
>>>>> dsPICs were doing audio, one was acting as a MIDI controller talking to two
>>>>> of the others as voice engines over SPI.
>>>>> 
>>>> 
>>>> _______________________________________________
>>>> 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 pata at ieee.org  Sun Jan  4 05:08:41 2015
From: pata at ieee.org (pata at ieee.org)
Date: Sun, 04 Jan 2015 13:08:41 +0900
Subject: [sdiy] [FS]TEMPCOs & others
Message-ID: <54A8BCC9.7030809@ieee.org>

Happy new Year to you all!

As last year, I continuew to sell TEMPCOs and some other components,
such as OTA,.
All types are thru-hole outliens (not SMD).
If interested, please contact me off-list or access my website (sorry,
only in Japanese but some guides in English).

Cheers,

Taku


=========================================
Takuya "Taku" Katayama
Muse Music Synthesizer Laboratory, Japan
http://www.mmslab.jp/



From grant at musictechnologiesgroup.com  Sun Jan  4 05:36:22 2015
From: grant at musictechnologiesgroup.com (MTG)
Date: Sat, 03 Jan 2015 20:36:22 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
References: <54A8166F.4010204@gte.net>	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
Message-ID: <54A8C346.3040305@musictechnologiesgroup.com>

I don't know if anyone else uses it, but I played with Rowley Crossworks 
for ARM and the licensing reminded me of Eagle CAD ( as in very 
reasonable). They have a ton of board support packages for various eval 
boards and other development platforms.

GB

On 1/3/2015 6:10 PM, Chris McDowell wrote:
> Olivier, how would you suggest one get started with the STM32 chips?
 > I?ve always stuck to what I could accomplish within the Arduino IDE,
 > but would really love to ?level up?. I bought one of the mbed-enabled
 > nucleo dev boards from ST and really enjoy the extra horsepower, but
 > I don?t want to rely on the mbed environment for developing any
 > actual products. A nudge in the right direction
 > would be much appreciated! :)


From dixon at mail.ubc.ca  Sun Jan  4 05:52:48 2015
From: dixon at mail.ubc.ca (David G Dixon)
Date: Sat, 3 Jan 2015 20:52:48 -0800
Subject: [sdiy] Rhodes Chroma videos
In-Reply-To: <3831A2E7-1840-4E17-A47F-7830014750AC@ericframpton.com>
References: <3831A2E7-1840-4E17-A47F-7830014750AC@ericframpton.com>
Message-ID: <0C6B07F5748E4DDEA48AAB1E56A2D1B5@galvanox01>

Thanks for that!  Those videos are great, and very instructive.  I played a
Chroma once in a music store when I was a teenager, and I knew it was a
beast.  Maybe one day I'll buy one. 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Eric Frampton
> Sent: Saturday, January 03, 2015 7:25 PM
> To: Analogue Heaven; SDIY
> Subject: [sdiy] Rhodes Chroma videos
> 
> HI all -
> 
> My friend Patrick Strawser, as part of an ongoing video 
> series he calls The Keyboardist Blog, just finished cutting 
> together two videos of me giving a quick tour of the Rhodes 
> Chroma - actually two different Chromas - and then two other 
> videos of me demo'ing some sounds. Thought this might be of 
> interest, since there isn't a whole lot of Chroma footage 
> floating around out there.
> 
> A link to the Chroma playlist:
> 
> http://www.youtube.com/playlist?list=PLsaswloDrl6CQb-Ufo9sCo8F
> a7jBaGGBJ
> 
> A link to Pat's main Keyboardist Blog page, where you can 
> find me demo'ing a few other keyboards in my pile, as well as 
> his interviews with some other folks:
> 
> http://www.youtube.com/user/thekeyboardistblog
> 
> Cheers,
> Eric
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 



From rsdio at audiobanshee.com  Sun Jan  4 07:51:59 2015
From: rsdio at audiobanshee.com (rsdio at audiobanshee.com)
Date: Sat, 3 Jan 2015 22:51:59 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
Message-ID: <997016FC-3AFD-4C37-8C15-CA3B446B92FC@audiobanshee.com>

Olivier's advice is great. I'm a little torn about the advice to restrict yourself to text editor and command line tools for cross-platform development, though. On the one hand, it's incredibly useful to have all of these skills. Learning how to write C code that will compile and run on multiple platforms is a great way to really understand the language, and knowing how to use a text editor from the command line will probably get you out of trouble some where along the way.

On the other hand, I've never had a project where I needed to use anything outside the provided IDE and debugger. My advice here is to make sure that your custom boards always have the appropriate JTAG or other debugging hardware on board, so that your custom platform works with the vendor's IDE just like their evaluation platforms. In this way, I've always been able to debug my firmware on the actual hardware without any difficulty. It's incredibly rare that I need to write the code on a more common platform first, although I can see how that could be quite helpful in some situations.

Perhaps the difference between Olivier's projects and mine are that I'm always dealing with custom hardware that simply isn't available on any other platform, so I have to get my custom board running a.s.a.p., and having it work with the vendor's IDE is very helpful. Writing the same code for another platform wouldn't really work because the custom hardware isn't attached to the processor.

That said, I often use the command line for several pieces of the development process, and sometimes write custom tools on OSX or Unix to create files needed by the firmware.

By the way, I forgot to mention that Texas Instruments has a very interesting Tiva ARM line of processors that was formerly called Stellaris. I'm using the TM4C1294XL right now, and it looks quite promising. So add that to the list of processors I mentioned before.

Brian


On Sun, Jan 4, 2015 at 3:10 AM, Chris McDowell <declareupdate at gmail.com> wrote:
> Olivier, how would you suggest one get started with the STM32 chips? I?ve always stuck to what I could accomplish within the Arduino IDE, but would really love to ?level up?. I bought one of the mbed-enabled nucleo dev boards from ST and really enjoy the extra horsepower, but I don?t want to rely on the mbed environment for developing any actual products. A nudge in the right direction would be much appreciated! :)



From ol.gillet at gmail.com  Sun Jan  4 11:38:15 2015
From: ol.gillet at gmail.com (Olivier Gillet)
Date: Sun, 4 Jan 2015 11:38:15 +0100
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <997016FC-3AFD-4C37-8C15-CA3B446B92FC@audiobanshee.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
	<997016FC-3AFD-4C37-8C15-CA3B446B92FC@audiobanshee.com>
Message-ID: <CAJoLJ5WA0jxZDz1h9ogdWWHgwgXqvhGceb3888-CgQLOnVBGtQ@mail.gmail.com>

> On the other hand, I've never had a project where I needed to use anything outside the provided IDE and debugger.

The problem is that most debuggers are not really designed for
realtime DSP applications (though they are perfectly fine for
debugging other functionalities of a synth - like the MIDI
implementation, the user interface...). Few debuggers have plotting
(TI's Code Composer almost gets it right though) or stream acquisition
abilities, and when they have, they provide few options to perform
analysis on the data. I wish instead they could work more like
oscilloscopes and logic analyzers - with trigger conditions,
measurements, cursors, protocol decoders... Say I hear an occasional
click in the output of my DSP code. The easiest way I've found to work
through such issues is to run the code locally, dump all state
variables in a big file, and inspect it in a python shell in which I
can evaluate expressions on the data and plot things to my heart's
content. Sometimes that would even be outside the bandwidth of what a
JTAG interface do.

Another thing I like doing which is not possible in an IDE is to
automatically check if large code transformations still produce
correct results (identical or with mostly small difference) - run the
code locally to generate .wav files with both versions, load the data
and compute statistics on the difference is what I do.

Overall, having the ability to quickly put a bit of DSP or applicative
code "in vitro" to feed it very specific inputs and test patterns is
something too precious to make me switch to an IDE. I guess it's a
matter of the type of product - whether most of the development time
will be spent (and value added will be present) in the low-level
hardware functionality and interface, or in the DSP code/synth engine
itself.


From sdiy-mz01 at blauwurf.info  Sun Jan  4 15:55:42 2015
From: sdiy-mz01 at blauwurf.info (Michael Zacherl)
Date: Sun, 4 Jan 2015 15:55:42 +0100
Subject: [sdiy] filler parts to match minimum orders?
Message-ID: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>

Hi, I just searched a relevant posting/thread I think I read here some time ago, regarding the subject, to no avail. (*)
I found the thread rather inspiring.
So, what extra parts (besides the usual suspects of opamps, resistors etc) you put into the basket to meet a minimum order regulation? 
thanks & have a nice Sunday, Michael.

*) I think Paul S. kicked that off, IIRC.

--
http://mz.klingt.org



From davekendall at ntlworld.com  Sun Jan  4 16:14:52 2015
From: davekendall at ntlworld.com (Dave Kendall)
Date: Sun, 4 Jan 2015 15:14:52 +0000
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
Message-ID: <6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>

I often put in an IC or two that I've read up on and think might be 
interesting to experiment with, or are for a project I'd like to get 
round to one day.
There's a text file on the desktop which has all the parts jotted down 
that are missing for experiments, non-essential and back-burner 
projects, so it makes it quite easy.

cheers,
Dave

On 4 Jan 2015, at 14:55, Michael Zacherl wrote:

> Hi, I just searched a relevant posting/thread I think I read here some 
> time ago, regarding the subject, to no avail. (*)
> I found the thread rather inspiring.
> So, what extra parts (besides the usual suspects of opamps, resistors 
> etc) you put into the basket to meet a minimum order regulation?
> thanks & have a nice Sunday, Michael.
>
> *) I think Paul S. kicked that off, IIRC.
>
> --
> http://mz.klingt.org
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From ebrombaugh1 at cox.net  Sun Jan  4 18:20:14 2015
From: ebrombaugh1 at cox.net (Eric Brombaugh)
Date: Sun, 04 Jan 2015 10:20:14 -0700
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <bisW1p01L4AXc3W01isaoy>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
	<bisW1p01L4AXc3W01isaoy>
Message-ID: <54A9764E.3090403@cox.net>

Like Olivier I prefer to use a simple editor/gcc/make/gdb flow running 
in Linux for my ARM embedded development, but for those who want a 
tightly integrated IDE with syntax highlighting, source debugging and 
other advanced features, or those who don't care to work in a Linux 
environment there are a number of free dev tools that work with the 
STM32 in Windows:

http://www.emblocks.org/web/  - Em::Blocks is a free and featureful IDE 
that is easy to install and supports the STM32 Discovery boards out of 
the box. I've done a few test projects with this tool and found it 
fairly easy to use. Em::Blocks supports "semihosting" which allows you 
to redirect C stdio (printf, etc) to the host machine over the SWD/USB 
connection and also allows realtime probing of variables in a running 
process without halting.

http://www.coocox.org/ - CoIDE is free IDE based on reskinned Eclipse 
that supports a wide variety of ARM processors including some (but not 
all) of the STM32 line. I've used this for a few projects where the 
client needed to build under Windows. CoIDE also supports the STM32 
STLink V2 download/debug protocol without extra effort.

http://www.keil.com/arm/mdk.asp - Keil MDK is an expensive but well 
maintained IDE that "pro" shops use. There is a code-size limited free 
version for evaluation purposes that will generate up to 32kB binaries. 
I've used this for several small projects. The downside I've found is 
that it doesn't support STLink V2, so a more mainstream download/debug 
pod like a Segger J-Link is needed. Keil has excellent code optimization 
- typically binaries are 1/2 to 1/3 the size of those generated by GCC 
for the same input source. Unfortunately the 32kB code size limit is 
applied *prior* to the optimization step.

There are others out there but these are the ones I have direct 
experience with.

Eric

On 01/03/2015 11:51 PM, rsdio at audiobanshee.com wrote:
> Olivier's advice is great. I'm a little torn about the advice to restrict yourself to text editor and command line tools for cross-platform development, though. On the one hand, it's incredibly useful to have all of these skills. Learning how to write C code that will compile and run on multiple platforms is a great way to really understand the language, and knowing how to use a text editor from the command line will probably get you out of trouble some where along the way.



From grant at musictechnologiesgroup.com  Sun Jan  4 18:58:07 2015
From: grant at musictechnologiesgroup.com (MTG)
Date: Sun, 04 Jan 2015 09:58:07 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <54A9764E.3090403@cox.net>
References: <54A8166F.4010204@gte.net>	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>	<bisW1p01L4AXc3W01isaoy>
	<54A9764E.3090403@cox.net>
Message-ID: <54A97F2F.8020504@musictechnologiesgroup.com>

Here is the Rowley link:

http://www.rowley.co.uk/arm/

CrossWorks for ARM is a complete C/C++ and assembly language development 
system for Cortex-M, Cortex-A, Cortex-R, ARM7, ARM9, ARM11, and XScale 
microcontrollers. And when we say complete we mean complete -? 
CrossWorks for ARM is packed full of features such as:

     CrossStudio Integrated Development Environment. This is our own, 
natively built, IDE which takes care of edit, build, download, and 
debugging over SWD/JTAG.
     GNU GCC and Clang/LLVM C/C++ toolchains.
     The CrossWorks Debugger. Our multi-core debugger able to seamlessly 
debug applications built from within the IDE or applications built with 
external toolchains.
     The CrossWorks C Library. This is our own non-GPL and non-LGPL C 
runtime library is designed from the ground up for embedded processor 
applications.
     The CrossWorks Tasking Library, known as CTL. CTL is a royalty-free 
tasking library that provides a multi-priority, preemptive, task 
switching and synchronization facility.


GB

On 1/4/2015 9:20 AM, Eric Brombaugh wrote:
> Like Olivier I prefer to use a simple editor/gcc/make/gdb flow running
> in Linux for my ARM embedded development, but for those who want a
> tightly integrated IDE with syntax highlighting, source debugging and
> other advanced features, or those who don't care to work in a Linux
> environment there are a number of free dev tools that work with the
> STM32 in Windows:
>
> http://www.emblocks.org/web/  - Em::Blocks is a free and featureful IDE
> that is easy to install and supports the STM32 Discovery boards out of
> the box. I've done a few test projects with this tool and found it
> fairly easy to use. Em::Blocks supports "semihosting" which allows you
> to redirect C stdio (printf, etc) to the host machine over the SWD/USB
> connection and also allows realtime probing of variables in a running
> process without halting.
>
> http://www.coocox.org/ - CoIDE is free IDE based on reskinned Eclipse
> that supports a wide variety of ARM processors including some (but not
> all) of the STM32 line. I've used this for a few projects where the
> client needed to build under Windows. CoIDE also supports the STM32
> STLink V2 download/debug protocol without extra effort.
>
> http://www.keil.com/arm/mdk.asp - Keil MDK is an expensive but well
> maintained IDE that "pro" shops use. There is a code-size limited free
> version for evaluation purposes that will generate up to 32kB binaries.
> I've used this for several small projects. The downside I've found is
> that it doesn't support STLink V2, so a more mainstream download/debug
> pod like a Segger J-Link is needed. Keil has excellent code optimization
> - typically binaries are 1/2 to 1/3 the size of those generated by GCC
> for the same input source. Unfortunately the 32kB code size limit is
> applied *prior* to the optimization step.
>
> There are others out there but these are the ones I have direct
> experience with.
>
> Eric


From ebrombaugh1 at cox.net  Sun Jan  4 19:42:45 2015
From: ebrombaugh1 at cox.net (Eric Brombaugh)
Date: Sun, 04 Jan 2015 11:42:45 -0700
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <btyj1p00N4AXc3W01tyn0a>
References: <54A8166F.4010204@gte.net>	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>	<bisW1p01L4AXc3W01isaoy>
	<54A9764E.3090403@cox.net> <btyj1p00N4AXc3W01tyn0a>
Message-ID: <54A989A5.4080201@cox.net>

I bought a personal license to Rowley / Crossworks about 8 years ago 
when I first started experimenting with embedded ARM and did a number of 
test projects with it at the time. It's a decent tool with lots of nice 
features but I don't use it now and here's why: the terms for the 
personal license are very explicit that it cannot be used for any work 
that earns money. Since a lot of my work ends up in commercial 
applications I can't in good conscience use this tool, and I don't want 
the hassle of starting a personal project in Crossworks and then porting 
to some other tool if/when I find a commercial application for it.

Given the number of high-quality free IDEs out there that perform as 
well as Crossworks and don't impose restrictions, I'm surprised that 
their personal and educational licenses have any market at all.

Eric

On 01/04/2015 10:58 AM, MTG wrote:
> Here is the Rowley link:
>
> http://www.rowley.co.uk/arm/




From timr at circuitabbey.com  Sun Jan  4 22:12:31 2015
From: timr at circuitabbey.com (Tim Ressel)
Date: Sun, 4 Jan 2015 21:12:31 +0000 (UTC)
Subject: [sdiy] For sale: Line6 Tonecore dev kit
Message-ID: <376889764.2119101.1420405951296.JavaMail.yahoo@jws100185.mail.ne1.yahoo.com>

Hi,
I bought this and never used it. Line6 Tonecore development kit, new in box, never used. Includes extra programmable module. Sorry, no power supply. I'm asking $125. US only please.

Tim Ressel
Circuit Abbey
503-750-9331
timr at circuitabbey.com


From tom at electricdruid.net  Sun Jan  4 22:22:37 2015
From: tom at electricdruid.net (Tom Wiltshire)
Date: Sun, 4 Jan 2015 21:22:37 +0000
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <54A989A5.4080201@cox.net>
References: <54A8166F.4010204@gte.net>	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>	<bisW1p01L4AXc3W01isaoy>
	<54A9764E.3090403@cox.net> <btyj1p00N4AXc3W01tyn0a>
	<54A989A5.4080201@cox.net>
Message-ID: <A404ED99-BF72-49AA-989E-8FD48338189A@electricdruid.net>

Maybe that just means other people don't have such powerful consciences as you, Eric.

Tom

On 4 Jan 2015, at 18:42, Eric Brombaugh <ebrombaugh1 at cox.net> wrote:

> Given the number of high-quality free IDEs out there that perform as well as Crossworks and don't impose restrictions, I'm surprised that their personal and educational licenses have any market at all.



From fanwander at mnet-online.de  Sun Jan  4 22:49:49 2015
From: fanwander at mnet-online.de (Florian Anwander)
Date: Sun, 04 Jan 2015 22:49:49 +0100
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
Message-ID: <54A9B57D.4040608@mnet-online.de>

I think it depends on what you are usually doing. I make V-Trigger to 
S-Trigger adapters for others. So I fill up orders with connectors and 
sockets. Those are usually "expensive", which means in this case, that I 
can order a low number, a get to the minimum order sum quite fast.



On 04.01.15 15:55 , Michael Zacherl wrote:
> Hi, I just searched a relevant posting/thread I think I read here some time ago, regarding the subject, to no avail. (*)
> I found the thread rather inspiring.
> So, what extra parts (besides the usual suspects of opamps, resistors etc) you put into the basket to meet a minimum order regulation?
> thanks&  have a nice Sunday, Michael.
>
> *) I think Paul S. kicked that off, IIRC.
>
> --
> http://mz.klingt.org
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From rsdio at audiobanshee.com  Mon Jan  5 00:08:40 2015
From: rsdio at audiobanshee.com (rsdio at audiobanshee.com)
Date: Sun, 4 Jan 2015 15:08:40 -0800
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <CAJoLJ5WA0jxZDz1h9ogdWWHgwgXqvhGceb3888-CgQLOnVBGtQ@mail.gmail.com>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
	<997016FC-3AFD-4C37-8C15-CA3B446B92FC@audiobanshee.com>
	<CAJoLJ5WA0jxZDz1h9ogdWWHgwgXqvhGceb3888-CgQLOnVBGtQ@mail.gmail.com>
Message-ID: <4D1AE8EE-25C8-49CB-980D-06A1460298F1@audiobanshee.com>


On Jan 4, 2015, at 2:38 AM, Olivier Gillet <ol.gillet at gmail.com> wrote:
>> On the other hand, I've never had a project where I needed to use anything outside the provided IDE and debugger.
> 
> The problem is that most debuggers are not really designed for
> realtime DSP applications (though they are perfectly fine for
> debugging other functionalities of a synth - like the MIDI
> implementation, the user interface...). Few debuggers have plotting
> (TI's Code Composer almost gets it right though) or stream acquisition
> abilities, and when they have, they provide few options to perform
> analysis on the data. I wish instead they could work more like
> oscilloscopes and logic analyzers - with trigger conditions,
> measurements, cursors, protocol decoders... Say I hear an occasional
> click in the output of my DSP code. The easiest way I've found to work
> through such issues is to run the code locally, dump all state
> variables in a big file, and inspect it in a python shell in which I
> can evaluate expressions on the data and plot things to my heart's
> content. Sometimes that would even be outside the bandwidth of what a
> JTAG interface do.
> 
> Another thing I like doing which is not possible in an IDE is to
> automatically check if large code transformations still produce
> correct results (identical or with mostly small difference) - run the
> code locally to generate .wav files with both versions, load the data
> and compute statistics on the difference is what I do.
> 
> Overall, having the ability to quickly put a bit of DSP or applicative
> code "in vitro" to feed it very specific inputs and test patterns is
> something too precious to make me switch to an IDE. I guess it's a
> matter of the type of product - whether most of the development time
> will be spent (and value added will be present) in the low-level
> hardware functionality and interface, or in the DSP code/synth engine
> itself.

Excellent information, Olivier! I guess I took Code Composer Studio for granted, because I highly leveraged it's streaming audio buffer graphing features while developing for the TMS320 C5000 family.

When it comes to correct results, I ended up writing firmware that was a test environment for the DSP subroutines. The firmware would generate sine waves at specific frequencies, call the DSP subroutines with specific parameters, and then analyze the results. At first, I printed out values - CCS allows printf() from the DSP to appear inside the IDE. I don't think I would have figured out how to do that on my own. But eventually I just used CCS to graph the results of the tests, and then I could see any problems easily. CCS allows you to save a working environment with all of the graphs that you've set up, and I would load that whole collection whenever I needed to do analysis. When I was in the middle of DSP development, I had environments with half a dozen graphs, including real and imaginary buffers, input and output data, time domain and frequency domain. This all made it possible to carefully test everything.

One thing to consider is whether you're working on firmware for a "real" DSP, or simply doing DSP operations on a general purpose CPU. In the latter case, it's easy enough to run the "tests" on your Mac because Standard C is Standard C everywhere. But in my case, the DSP code is in assembly, and it's very difficult to simulate the same results when the processor has an instruction set that cannot be fully expressed in C. TI has a simulator, but since that runs inside CCS anyway, I found it just as easy to run on the actual processor.

In any case, it is very important to have some method of testing your DSP subroutines. Without careful control of input and output, you can't verify that the results will be correct when you run normal audio through. So, while I would encourage people to learn the capabilities of their IDE as well as learn the command-line tools, I suggest that they always follow your advice about testing - whether that testing occurs within the IDE or on the host computer command-line.

Brian Willoughby
Sound Consulting



From rsdio at audiobanshee.com  Mon Jan  5 00:17:32 2015
From: rsdio at audiobanshee.com (rsdio at audiobanshee.com)
Date: Sun, 4 Jan 2015 15:17:32 -0800
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>
Message-ID: <5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>

I like to use a feature on Mouser.com where you can put parts lists into saved projects. I have a few extra projects that are just interesting parts that I need for low-priority to-do items.

I've also noticed that Mouser will save a shopping cart indefinitely. So, I'll keep adding parts to my shopping cart until it's time to make a real order, and then I'll get those extra parts. Sometimes I have to save my shopping cart to a temporary "project" if I'm ordering for a customer (because I don't expect them to pay for my side projects), and then I restore my shopping cart after the official order.

Of course, my motivations are completely different here. Mouser does not have a minimum order. They're perfectly willing to sell you one SMD resistor for a fraction of a penny, and then add the normal $5 to $10 shipping (depending upon the speed). So, I'm not tracking all of these low-priority parts because of minimums. Instead, I'm just trying to avoid paying shipping on small items. If something isn't needed right away, it sits in my shopping cart until I have a large order where the shipping is just a tiny fraction of the total cost, and then adding these other parts is about the same as getting free shipping.

What's funny (I think) is that I still have many projects at Mouser that have line items in red because they do not carry the part. But in those cases I'm actually just abusing the Mouser feature to track items that I buy from other vendors. I suppose you have to do that when your project uses so many parts that they're not all available from one distributor / reseller.

Brian


On Jan 4, 2015, at 7:14 AM, Dave Kendall <davekendall at ntlworld.com> wrote:
> I often put in an IC or two that I've read up on and think might be interesting to experiment with, or are for a project I'd like to get round to one day.
> There's a text file on the desktop which has all the parts jotted down that are missing for experiments, non-essential and back-burner projects, so it makes it quite easy.
> 
> On 4 Jan 2015, at 14:55, Michael Zacherl wrote:
>> Hi, I just searched a relevant posting/thread I think I read here some time ago, regarding the subject, to no avail. (*)
>> I found the thread rather inspiring.
>> So, what extra parts (besides the usual suspects of opamps, resistors etc) you put into the basket to meet a minimum order regulation?
>> thanks & have a nice Sunday, Michael.
>> 
>> *) I think Paul S. kicked that off, IIRC.
> 


From subjectivity at hotmail.com  Mon Jan  5 02:11:35 2015
From: subjectivity at hotmail.com (Dan Snazelle)
Date: Sun, 4 Jan 2015 20:11:35 -0500
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>
	<5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>
Message-ID: <SNT405-EAS111AB887AA69E333477E146C8580@phx.gbl>

Speaking of all the "red" line items, I've been saving projects on mouser for a good amount of years now and it's sad to see just how many parts have gone obsolete in 7 yrs :( 



Sent from my iPhone

> On Jan 4, 2015, at 6:19 PM, rsdio at audiobanshee.com wrote:
> 
> I like to use a feature on Mouser.com where you can put parts lists into saved projects. I have a few extra projects that are just interesting parts that I need for low-priority to-do items.
> 
> I've also noticed that Mouser will save a shopping cart indefinitely. So, I'll keep adding parts to my shopping cart until it's time to make a real order, and then I'll get those extra parts. Sometimes I have to save my shopping cart to a temporary "project" if I'm ordering for a customer (because I don't expect them to pay for my side projects), and then I restore my shopping cart after the official order.
> 
> Of course, my motivations are completely different here. Mouser does not have a minimum order. They're perfectly willing to sell you one SMD resistor for a fraction of a penny, and then add the normal $5 to $10 shipping (depending upon the speed). So, I'm not tracking all of these low-priority parts because of minimums. Instead, I'm just trying to avoid paying shipping on small items. If something isn't needed right away, it sits in my shopping cart until I have a large order where the shipping is just a tiny fraction of the total cost, and then adding these other parts is about the same as getting free shipping.
> 
> What's funny (I think) is that I still have many projects at Mouser that have line items in red because they do not carry the part. But in those cases I'm actually just abusing the Mouser feature to track items that I buy from other vendors. I suppose you have to do that when your project uses so many parts that they're not all available from one distributor / reseller.
> 
> Brian
> 
> 
>> On Jan 4, 2015, at 7:14 AM, Dave Kendall <davekendall at ntlworld.com> wrote:
>> I often put in an IC or two that I've read up on and think might be interesting to experiment with, or are for a project I'd like to get round to one day.
>> There's a text file on the desktop which has all the parts jotted down that are missing for experiments, non-essential and back-burner projects, so it makes it quite easy.
>> 
>>> On 4 Jan 2015, at 14:55, Michael Zacherl wrote:
>>> Hi, I just searched a relevant posting/thread I think I read here some time ago, regarding the subject, to no avail. (*)
>>> I found the thread rather inspiring.
>>> So, what extra parts (besides the usual suspects of opamps, resistors etc) you put into the basket to meet a minimum order regulation?
>>> thanks & have a nice Sunday, Michael.
>>> 
>>> *) I think Paul S. kicked that off, IIRC.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From rsdio at audiobanshee.com  Mon Jan  5 02:15:54 2015
From: rsdio at audiobanshee.com (rsdio at audiobanshee.com)
Date: Sun, 4 Jan 2015 17:15:54 -0800
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <SNT405-EAS111AB887AA69E333477E146C8580@phx.gbl>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>
	<5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>
	<SNT405-EAS111AB887AA69E333477E146C8580@phx.gbl>
Message-ID: <39FA6422-B6BC-495D-B35D-660AFE3CEC3A@audiobanshee.com>

Not always sad, when you consider that many of them have been replaced by better parts.

Now that I've designed products that are continually being manufactured, I subscribe to various manufacturers updates for their parts. Texas Instruments, in particular, will email you whenever a part is scheduled to become obsolete, or even the slightest change that might affect your product design. This way you can update your bill of materials and stay current.


On Jan 4, 2015, at 5:11 PM, Dan Snazelle <subjectivity at hotmail.com> wrote:
> Speaking of all the "red" line items, I've been saving projects on mouser for a good amount of years now and it's sad to see just how many parts have gone obsolete in 7 yrs :( 
> 


From ebrombaugh1 at cox.net  Mon Jan  5 04:41:51 2015
From: ebrombaugh1 at cox.net (Eric Brombaugh)
Date: Sun, 4 Jan 2015 20:41:51 -0700
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <bz9E1p00e4AXc3W01z9H7k>
References: <54A8166F.4010204@gte.net>
	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>
	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>
	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>
	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>
	<997016FC-3AFD-4C37-8C15-CA3B446B92FC@audiobanshee.com>
	<CAJoLJ5WA0jxZDz1h9ogdWWHgwgXqvhGceb3888-CgQLOnVBGtQ@mail.gmail.com>
	<bz9E1p00e4AXc3W01z9H7k>
Message-ID: <0FF9E4B5-9FBD-42F8-AFE0-5F61182DD409@cox.net>


On Jan 4, 2015, at 4:08 PM, rsdio at audiobanshee.com wrote:

> One thing to consider is whether you're working on firmware for a "real" DSP, or simply doing DSP operations on a general purpose CPU. In the latter case, it's easy enough to run the "tests" on your Mac because Standard C is Standard C everywhere. But in my case, the DSP code is in assembly, and it's very difficult to simulate the same results when the processor has an instruction set that cannot be fully expressed in C. TI has a simulator, but since that runs inside CCS anyway, I found it just as easy to run on the actual processor.

This is a good point - without thorough testing it's easy to overlook some fairly obvious bugs in the DSP. On the embedded ARM systems I've often extracted the C source for my DSP routines and run them on the PC with controlled stimulus / analysis to ensure things are working right. I've made extensive use of Matlab and/or Octave for this and recommend it.

Eric

From ebrombaugh1 at cox.net  Mon Jan  5 04:46:09 2015
From: ebrombaugh1 at cox.net (Eric Brombaugh)
Date: Sun, 4 Jan 2015 20:46:09 -0700
Subject: [sdiy] Microcontrollers for eurorack use... What to use?
In-Reply-To: <bxNa1p00L1RikxN01xNc8J>
References: <54A8166F.4010204@gte.net>	<BLU436-SMTP1265D3A432EA529E7F45DE0FB5A0@phx.gbl>	<CAJoLJ5U6sWvLnnZQASXR7GV3scokY72=0+tkHMYgU9qEi-=rGA@mail.gmail.com>	<67A42018-ACB9-4095-8826-7D26D0B10DDC@gmail.com>	<CAJoLJ5U3OKFUmO98CrhM9eBRTzK95r1j_s-=V18svXqCZG8L4w@mail.gmail.com>	<bisW1p01L4AXc3W01isaoy>
	<54A9764E.3090403@cox.net> <btyj1p00N4AXc3W01tyn0a>
	<54A989A5.4080201@cox.net> <bxNa1p00L1RikxN01xNc8J>
Message-ID: <E49E6228-C335-4EF1-993F-46870CF60BEE@cox.net>


On Jan 4, 2015, at 2:22 PM, Tom Wiltshire wrote:

> Maybe that just means other people don't have such powerful consciences as you, Eric.

Heh - maybe I'm uptight about it but it's one less thing to worry about, and given the quality of the other tools I've found it's not a sacrifice.

Eric



From indigoid at oldcorollas.org  Mon Jan  5 06:54:04 2015
From: indigoid at oldcorollas.org (john slee)
Date: Mon, 5 Jan 2015 16:54:04 +1100
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <39FA6422-B6BC-495D-B35D-660AFE3CEC3A@audiobanshee.com>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>
	<5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>
	<SNT405-EAS111AB887AA69E333477E146C8580@phx.gbl>
	<39FA6422-B6BC-495D-B35D-660AFE3CEC3A@audiobanshee.com>
Message-ID: <CAK+JDy3-BViCU3uhxybjH6JAgOPA9yybFzf73UjnNSqr+H=K3Q@mail.gmail.com>

On 5 January 2015 at 12:15, <rsdio at audiobanshee.com> wrote:
> Not always sad, when you consider that many of them have been replaced by better parts.

I think ONSemi killing off their entire TO-92 line counts as sad, though.

I can understand why, and the existing stocks will last for a long
while, but I still think it's sad. Yeah, I could order up some SOT =>
SIL adapter PCBs for use with breadboards etc, but they'd be rather a
lot more expensive than the $0.05 transistors I'd mount on them.

John


From stewpye at optusnet.com.au  Mon Jan  5 07:35:37 2015
From: stewpye at optusnet.com.au (Stewart Pye)
Date: Mon, 05 Jan 2015 16:35:37 +1000
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <54A9B57D.4040608@mnet-online.de>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<54A9B57D.4040608@mnet-online.de>
Message-ID: <54AA30B9.5020801@optusnet.com.au>

If ordering from Mouser I buy extra banana sockets if my order value is 
low. I know I'll use them eventually. The shipping to Australia from 
Mouser is prohibitive for small orders...

Regards,
Stewart.

On 1/5/2015 7:49 AM, Florian Anwander wrote:
> I think it depends on what you are usually doing. I make V-Trigger to 
> S-Trigger adapters for others. So I fill up orders with connectors and 
> sockets. Those are usually "expensive", which means in this case, that 
> I can order a low number, a get to the minimum order sum quite fast.
>
>
>
> On 04.01.15 15:55 , Michael Zacherl wrote:
>> Hi, I just searched a relevant posting/thread I think I read here 
>> some time ago, regarding the subject, to no avail. (*)
>> I found the thread rather inspiring.
>> So, what extra parts (besides the usual suspects of opamps, resistors 
>> etc) you put into the basket to meet a minimum order regulation?
>> thanks&  have a nice Sunday, Michael.
>>
>> *) I think Paul S. kicked that off, IIRC.
>>
>> -- 
>> http://mz.klingt.org
>>
>> _______________________________________________
>> 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 21pointy at tpg.com.au  Mon Jan  5 08:56:48 2015
From: 21pointy at tpg.com.au (Adam Inglis)
Date: Mon, 5 Jan 2015 17:56:48 +1000
Subject: [sdiy] A JP8 VCO question
In-Reply-To: <DUB123-W36CA6C2EA179816397AEFA975F0@phx.gbl>
References: <DUB123-W36CA6C2EA179816397AEFA975F0@phx.gbl>
Message-ID: <05138458-DE7D-46F5-A670-8C53E5E2D1FA@tpg.com.au>

Hi Jack

On 01/01/2015, at 4:08 AM, Jack Jackson wrote:
> you select VCO2 only and set range to 'normal' and 16' then play the  
> lowest possible note on the keyboard. What frequency is the  
> oscillator?

32 Hz

> If you then set the range switch to 'low freq' what frequency is the  
> oscillator now?

Too low for my Rigol to accurately measure, but about 4 Hz


Adam



From oakleylist at btinternet.com  Mon Jan  5 10:15:45 2015
From: oakleylist at btinternet.com (Oakley Sound)
Date: Mon, 05 Jan 2015 09:15:45 +0000
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
Message-ID: <54AA5641.8010407@btinternet.com>

My usual ones for me are consumables like glue, solder wick and drill 
bits. Other useful things are IEC inlet sockets, 1/4" sockets and jacks 
and sometimes tools.

The latter did once really push the amount over the minimum. I was 
looking for something small in the tools section, like a new 
screwdriver, but ended up buying a new scope. Yikes!

Tony

www.oakleysound.com


From modular at go2.pl  Mon Jan  5 13:21:56 2015
From: modular at go2.pl (Roman Sowa)
Date: Mon, 05 Jan 2015 13:21:56 +0100
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <CAK+JDy3-BViCU3uhxybjH6JAgOPA9yybFzf73UjnNSqr+H=K3Q@mail.gmail.com>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>	<6EC7C296-9424-11E4-91D5-000393A85F9E@ntlworld.com>	<5A3C018C-54B1-4C43-B0D0-8BD7B6777A90@audiobanshee.com>	<SNT405-EAS111AB887AA69E333477E146C8580@phx.gbl>	<39FA6422-B6BC-495D-B35D-660AFE3CEC3A@audiobanshee.com>
	<CAK+JDy3-BViCU3uhxybjH6JAgOPA9yybFzf73UjnNSqr+H=K3Q@mail.gmail.com>
Message-ID: <54AA81E4.3070104@go2.pl>

I miss the TO-18 metal can transistors, as this was the mainstream when 
I started. Still you can get some strange transistors in that case, but 
when I see BC109 in my old match box case I almost cry...
This however does not prevent me from loving those tiny buggers like 
SC75, which makes SOT23 look like giant.

For minimum order, or actually free shipping threshold, I always do the 
same trick. When the thershold is reached in current cart, I don't add 
any other parts which I don't need immediately. I know for sure there 
will be next order in a month or 2, and I keep those needs for next 
order. So this way I'm almost at the thresold again before I add 
anything. Let me only add I never paid a cent for shipping from Mouser 
and this is across the ocean.

Roman

W dniu 2015-01-05 o 06:54, john slee pisze:
> On 5 January 2015 at 12:15, <rsdio at audiobanshee.com> wrote:
>> Not always sad, when you consider that many of them have been replaced by better parts.
>
> I think ONSemi killing off their entire TO-92 line counts as sad, though.
>
> I can understand why, and the existing stocks will last for a long
> while, but I still think it's sad. Yeah, I could order up some SOT =>
> SIL adapter PCBs for use with breadboards etc, but they'd be rather a
> lot more expensive than the $0.05 transistors I'd mount on them.
>
> John
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From fanwander at mnet-online.de  Mon Jan  5 13:30:07 2015
From: fanwander at mnet-online.de (Florian Anwander)
Date: Mon, 05 Jan 2015 13:30:07 +0100
Subject: [sdiy] filler parts to match minimum orders?
In-Reply-To: <54AA5641.8010407@btinternet.com>
References: <1D2249B6-C7AE-461F-9218-DC561E9E6855@blauwurf.info>
	<54AA5641.8010407@btinternet.com>
Message-ID: <54AA83CF.4020205@mnet-online.de>

Am 05.01.2015 um 10:15 schrieb Oakley Sound:
> I was looking for something small in the tools section, like a new 
> screwdriver, but ended up buying a new scope. Yikes!
Our company should headhunt the webshop designer of Mouser :)))))


From andy at cytomic.com  Mon Jan  5 14:25:37 2015
From: andy at cytomic.com (Andrew Simper)
Date: Mon, 5 Jan 2015 21:25:37 +0800
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
Message-ID: <CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>

I've taken Sam's ARP transposed SVF design with input mixing and
written a discretization technical paper on it. I've also updated the
SKF (Sallen Key Filter) design I did with input mixing to more
explicitly address using different input signals.

Idealized circuit diagrams:
http://cytomic.com/files/dsp/SkfInputMixing.jpg
http://cytomic.com/files/dsp/SvfInputMixing.jpg

Technical papers:
http://cytomic.com/files/dsp/SkfInputMixing.pdf
http://cytomic.com/files/dsp/SvfInputMixing.pdf

All the best,

Andrew Simper
-- cytomic -- sound music software --


On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
> Hello Andy and list,
>
> I'm grad you like my schematics.
>
> Multiple point signal injection is a very interesting idea.
> I guess you can get any response from famous filter structure
> keeping the original sound.  Four pole filter such as ladder
> filter may be a good target.
>
> Sam HOSHUYAMA
> Saitama, JAPAN
>
>
>
> ----- Original Message -----
> From: "Andrew Simper" <andy at cytomic.com>
> To: houshu at muj.biglobe.ne.jp
> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, December 23, 2014 13:00:39
> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>
> Sam you're a legend!
>
> You just saved me an IEEE membership just to look at one paper and
> some pain in "fixing" the schematics in it. I was really interested in
> the SVF with mixing inputs and you just delivered it straight to me
> with a wonderfully clear LTSpice schematic, thank-you!
>
> I hope I can come up with some more interesting designs to help
> contribute to the synth community like you are doing.
>
> The positive feedback path around the Band section and that you noted
> is from the ARP 4023, it looks like the OSCar also copied this idea -
> thanks for pointing out the original.
>
> Andy
>
> -- cytomic -- sound music software --
>
>
> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>> Hello list,
>>
>> Input mixing structure is possible with state-variable-like filter.
>>
>> http://houshu.at.webry.info/201202/article_1.html
>>
>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>> beautiful frequency response can be obtained from this very
>> simple circuit.
>>
>> Basic structure is like ARP4023, which can be derived from
>> ordinary state variable filter:
>> http://houshu.at.webry.info/200602/article_1.html
>>
>> I built a module with satisfactory results:
>> http://houshu.at.webry.info/201202/article_2.html
>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>> Power consumption is as small as 5mA.
>>
>> I designed it for single supply operation.
>> Bipolar supply operation is possible by changing the
>> exponential converter (Untested):
>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>
>> Sam HOSHUYAMA
>> Saitama, Japan
>>
>> ----- Original Message -----
>> From: "Andrew Simper" <andy at cytomic.com>
>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>> Sent: Sunday, December 21, 2014 16:54:23
>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>
>> Hey guys,
>>
>> I've noticed many Sallen Key synth filters can generate different
>> responses by sticking the input into various points of the circuit,
>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>> I've worked out the theory for generating all the same responses as
>> you can get by mixing the outputs of an State Variable, but instead
>> mixing the inputs to a Sallen Key. I've put together a technical paper
>> on it here:
>>
>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>
>> and I've sketched the basic structure of what is going on here (taking
>> an MS20 v2 type OTA Sallen Key as the basis):
>>
>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>
>> the important voltages are:
>>
>> vamp1 = (m0*v0) - (m1*v0 + v1)
>> vamp2 = (m1*v0 + v1) - (v2)
>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>> vcap2 = (v2) - (m2*v0)
>>
>> where m0 = low mix, m1 = band mix and m2 = high mix
>>
>> Also for those interested in a digital implementation I've also
>> included in the paper is also a trapezoidal integrated linear circuit
>> model use state space increments and high precision coefficient
>> calculation.
>>
>> Andy
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From rburnett at richieburnett.co.uk  Mon Jan  5 14:50:15 2015
From: rburnett at richieburnett.co.uk (rburnett at richieburnett.co.uk)
Date: Mon, 05 Jan 2015 13:50:15 +0000
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
	<CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
Message-ID: <bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>

Hi Andy,

Thanks for sharing this interesting work.

In the discretization technical paper it would have been interesting to 
see the resulting z-domain frequency responses for the digital 
realisations of the filters, so that comparisons can be made with the 
original s-domain analogue prototypes as the cutoff frequency approaches 
the Nyquist limit.  (The s-domain frequency responses are "textbook" 
analogue 2nd order shapes, so aren't particularly interesting by 
themselves.)

-Richie,

PS. The mixture of "electrical schematic" and "signal flow" 
representations in the same diagrams might be a little confusing to 
some.  I'm an electronics engineer so am familiar with looking at both, 
but they usually aren't mixed in the same diagram.





On 2015-01-05 13:25, Andrew Simper wrote:
> I've taken Sam's ARP transposed SVF design with input mixing and
> written a discretization technical paper on it. I've also updated the
> SKF (Sallen Key Filter) design I did with input mixing to more
> explicitly address using different input signals.
> 
> Idealized circuit diagrams:
> http://cytomic.com/files/dsp/SkfInputMixing.jpg
> http://cytomic.com/files/dsp/SvfInputMixing.jpg
> 
> Technical papers:
> http://cytomic.com/files/dsp/SkfInputMixing.pdf
> http://cytomic.com/files/dsp/SvfInputMixing.pdf
> 
> All the best,
> 
> Andrew Simper
> -- cytomic -- sound music software --
> 
> 
> On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
>> Hello Andy and list,
>> 
>> I'm grad you like my schematics.
>> 
>> Multiple point signal injection is a very interesting idea.
>> I guess you can get any response from famous filter structure
>> keeping the original sound.  Four pole filter such as ladder
>> filter may be a good target.
>> 
>> Sam HOSHUYAMA
>> Saitama, JAPAN
>> 
>> 
>> 
>> ----- Original Message -----
>> From: "Andrew Simper" <andy at cytomic.com>
>> To: houshu at muj.biglobe.ne.jp
>> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>> Sent: Tuesday, December 23, 2014 13:00:39
>> Subject: Re: [sdiy] Sallen Key with input mixing to generate all 
>> shapes
>> 
>> Sam you're a legend!
>> 
>> You just saved me an IEEE membership just to look at one paper and
>> some pain in "fixing" the schematics in it. I was really interested in
>> the SVF with mixing inputs and you just delivered it straight to me
>> with a wonderfully clear LTSpice schematic, thank-you!
>> 
>> I hope I can come up with some more interesting designs to help
>> contribute to the synth community like you are doing.
>> 
>> The positive feedback path around the Band section and that you noted
>> is from the ARP 4023, it looks like the OSCar also copied this idea -
>> thanks for pointing out the original.
>> 
>> Andy
>> 
>> -- cytomic -- sound music software --
>> 
>> 
>> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>>> Hello list,
>>> 
>>> Input mixing structure is possible with state-variable-like filter.
>>> 
>>> http://houshu.at.webry.info/201202/article_1.html
>>> 
>>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>>> beautiful frequency response can be obtained from this very
>>> simple circuit.
>>> 
>>> Basic structure is like ARP4023, which can be derived from
>>> ordinary state variable filter:
>>> http://houshu.at.webry.info/200602/article_1.html
>>> 
>>> I built a module with satisfactory results:
>>> http://houshu.at.webry.info/201202/article_2.html
>>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>>> Power consumption is as small as 5mA.
>>> 
>>> I designed it for single supply operation.
>>> Bipolar supply operation is possible by changing the
>>> exponential converter (Untested):
>>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>> 
>>> Sam HOSHUYAMA
>>> Saitama, Japan
>>> 
>>> ----- Original Message -----
>>> From: "Andrew Simper" <andy at cytomic.com>
>>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>> Sent: Sunday, December 21, 2014 16:54:23
>>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>> 
>>> Hey guys,
>>> 
>>> I've noticed many Sallen Key synth filters can generate different
>>> responses by sticking the input into various points of the circuit,
>>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>>> I've worked out the theory for generating all the same responses as
>>> you can get by mixing the outputs of an State Variable, but instead
>>> mixing the inputs to a Sallen Key. I've put together a technical 
>>> paper
>>> on it here:
>>> 
>>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>> 
>>> and I've sketched the basic structure of what is going on here 
>>> (taking
>>> an MS20 v2 type OTA Sallen Key as the basis):
>>> 
>>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>> 
>>> the important voltages are:
>>> 
>>> vamp1 = (m0*v0) - (m1*v0 + v1)
>>> vamp2 = (m1*v0 + v1) - (v2)
>>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>>> vcap2 = (v2) - (m2*v0)
>>> 
>>> where m0 = low mix, m1 = band mix and m2 = high mix
>>> 
>>> Also for those interested in a digital implementation I've also
>>> included in the paper is also a trapezoidal integrated linear circuit
>>> model use state space increments and high precision coefficient
>>> calculation.
>>> 
>>> Andy
>>> _______________________________________________
>>> 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 andy at cytomic.com  Tue Jan  6 02:28:02 2015
From: andy at cytomic.com (Andrew Simper)
Date: Tue, 6 Jan 2015 09:28:02 +0800
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
	<CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
	<bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>
Message-ID: <CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>

On 5 January 2015 at 21:50, <rburnett at richieburnett.co.uk> wrote:
>
> Hi Andy,
>
> Thanks for sharing this interesting work.

Your welcome!


> In the discretization technical paper it would have been interesting to see the resulting z-domain frequency responses for the digital realisations of the filters, so that comparisons can be made with the original s-domain analogue prototypes as the cutoff frequency approaches the Nyquist limit.  (The s-domain frequency responses are "textbook" analogue 2nd order shapes, so aren't particularly interesting by themselves.)
>
> -Richie,

It is trapezoidal integration, which gives a cramped response which is
equivalent to the bi-linear z transform which is why I didn't bother.
Please read the other papers I wrote for derivations and plotting of
the z-domain transfer function. I show the derivation of forming the
z-domain transfer function directly from trapezoidal integration here:
http://cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf in the
section "Transfer functions for low, band, high, notch, and peak,
continuous and discrete"


> PS. The mixture of "electrical schematic" and "signal flow" representations in the same diagrams might be a little confusing to some.  I'm an electronics engineer so am familiar with looking at both, but they usually aren't mixed in the same diagram.

I originally had little triangle amp blocks but things looked messy.
Donald posted a link to this paper:
http://www.ka-electronics.com/images/pdf/Steiner_Filter.pdf , which
uses a square with a sigma sign in the middle to show a summing block,
so I used this idea but instead used a more modern + sign in a circle.
Should I switch it to how Steiner does it with a square and sigma? Is
that more standard for idealised circuit diagrams? I show the
development of the notation I used here:
http://cytomic.com/files/dsp/OnePoleLinearLowPass.pdf with the full
resistor divider network to use a circle with a + instead, but I am
happy to change it if there is something just as succinct and more
standard.

All the best,

Andy


>
>
>
>
>
>
> On 2015-01-05 13:25, Andrew Simper wrote:
>>
>> I've taken Sam's ARP transposed SVF design with input mixing and
>> written a discretization technical paper on it. I've also updated the
>> SKF (Sallen Key Filter) design I did with input mixing to more
>> explicitly address using different input signals.
>>
>> Idealized circuit diagrams:
>> http://cytomic.com/files/dsp/SkfInputMixing.jpg
>> http://cytomic.com/files/dsp/SvfInputMixing.jpg
>>
>> Technical papers:
>> http://cytomic.com/files/dsp/SkfInputMixing.pdf
>> http://cytomic.com/files/dsp/SvfInputMixing.pdf
>>
>> All the best,
>>
>> Andrew Simper
>> -- cytomic -- sound music software --
>>
>>
>> On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
>>>
>>> Hello Andy and list,
>>>
>>> I'm grad you like my schematics.
>>>
>>> Multiple point signal injection is a very interesting idea.
>>> I guess you can get any response from famous filter structure
>>> keeping the original sound.  Four pole filter such as ladder
>>> filter may be a good target.
>>>
>>> Sam HOSHUYAMA
>>> Saitama, JAPAN
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Andrew Simper" <andy at cytomic.com>
>>> To: houshu at muj.biglobe.ne.jp
>>> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>> Sent: Tuesday, December 23, 2014 13:00:39
>>> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>>>
>>> Sam you're a legend!
>>>
>>> You just saved me an IEEE membership just to look at one paper and
>>> some pain in "fixing" the schematics in it. I was really interested in
>>> the SVF with mixing inputs and you just delivered it straight to me
>>> with a wonderfully clear LTSpice schematic, thank-you!
>>>
>>> I hope I can come up with some more interesting designs to help
>>> contribute to the synth community like you are doing.
>>>
>>> The positive feedback path around the Band section and that you noted
>>> is from the ARP 4023, it looks like the OSCar also copied this idea -
>>> thanks for pointing out the original.
>>>
>>> Andy
>>>
>>> -- cytomic -- sound music software --
>>>
>>>
>>> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>
>>>> Hello list,
>>>>
>>>> Input mixing structure is possible with state-variable-like filter.
>>>>
>>>> http://houshu.at.webry.info/201202/article_1.html
>>>>
>>>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>>>> beautiful frequency response can be obtained from this very
>>>> simple circuit.
>>>>
>>>> Basic structure is like ARP4023, which can be derived from
>>>> ordinary state variable filter:
>>>> http://houshu.at.webry.info/200602/article_1.html
>>>>
>>>> I built a module with satisfactory results:
>>>> http://houshu.at.webry.info/201202/article_2.html
>>>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>>>> Power consumption is as small as 5mA.
>>>>
>>>> I designed it for single supply operation.
>>>> Bipolar supply operation is possible by changing the
>>>> exponential converter (Untested):
>>>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>>>
>>>> Sam HOSHUYAMA
>>>> Saitama, Japan
>>>>
>>>> ----- Original Message -----
>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>> Sent: Sunday, December 21, 2014 16:54:23
>>>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>
>>>> Hey guys,
>>>>
>>>> I've noticed many Sallen Key synth filters can generate different
>>>> responses by sticking the input into various points of the circuit,
>>>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>>>> I've worked out the theory for generating all the same responses as
>>>> you can get by mixing the outputs of an State Variable, but instead
>>>> mixing the inputs to a Sallen Key. I've put together a technical paper
>>>> on it here:
>>>>
>>>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>>>
>>>> and I've sketched the basic structure of what is going on here (taking
>>>> an MS20 v2 type OTA Sallen Key as the basis):
>>>>
>>>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>>>
>>>> the important voltages are:
>>>>
>>>> vamp1 = (m0*v0) - (m1*v0 + v1)
>>>> vamp2 = (m1*v0 + v1) - (v2)
>>>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>>>> vcap2 = (v2) - (m2*v0)
>>>>
>>>> where m0 = low mix, m1 = band mix and m2 = high mix
>>>>
>>>> Also for those interested in a digital implementation I've also
>>>> included in the paper is also a trapezoidal integrated linear circuit
>>>> model use state space increments and high precision coefficient
>>>> calculation.
>>>>
>>>> Andy
>>>> _______________________________________________
>>>> 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 andy at cytomic.com  Tue Jan  6 02:52:17 2015
From: andy at cytomic.com (Andrew Simper)
Date: Tue, 6 Jan 2015 09:52:17 +0800
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
	<CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
	<bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>
	<CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
Message-ID: <CAAxOnzYXSfhgZXyR+0xsxkSkL79=bNF_pXAC0p9WxhDVWuF81w@mail.gmail.com>

Richie, do these look better?

http://cytomic.com/files/dsp/SvfInputMixing2.jpg
http://cytomic.com/files/dsp/SkfInputMixing2.jpg

Andy
-- cytomic -- sound music software --


On 6 January 2015 at 09:28, Andrew Simper <andy at cytomic.com> wrote:
> On 5 January 2015 at 21:50, <rburnett at richieburnett.co.uk> wrote:
>>
>> Hi Andy,
>>
>> Thanks for sharing this interesting work.
>
> Your welcome!
>
>
>> In the discretization technical paper it would have been interesting to see the resulting z-domain frequency responses for the digital realisations of the filters, so that comparisons can be made with the original s-domain analogue prototypes as the cutoff frequency approaches the Nyquist limit.  (The s-domain frequency responses are "textbook" analogue 2nd order shapes, so aren't particularly interesting by themselves.)
>>
>> -Richie,
>
> It is trapezoidal integration, which gives a cramped response which is
> equivalent to the bi-linear z transform which is why I didn't bother.
> Please read the other papers I wrote for derivations and plotting of
> the z-domain transfer function. I show the derivation of forming the
> z-domain transfer function directly from trapezoidal integration here:
> http://cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf in the
> section "Transfer functions for low, band, high, notch, and peak,
> continuous and discrete"
>
>
>> PS. The mixture of "electrical schematic" and "signal flow" representations in the same diagrams might be a little confusing to some.  I'm an electronics engineer so am familiar with looking at both, but they usually aren't mixed in the same diagram.
>
> I originally had little triangle amp blocks but things looked messy.
> Donald posted a link to this paper:
> http://www.ka-electronics.com/images/pdf/Steiner_Filter.pdf , which
> uses a square with a sigma sign in the middle to show a summing block,
> so I used this idea but instead used a more modern + sign in a circle.
> Should I switch it to how Steiner does it with a square and sigma? Is
> that more standard for idealised circuit diagrams? I show the
> development of the notation I used here:
> http://cytomic.com/files/dsp/OnePoleLinearLowPass.pdf with the full
> resistor divider network to use a circle with a + instead, but I am
> happy to change it if there is something just as succinct and more
> standard.
>
> All the best,
>
> Andy
>
>
>>
>>
>>
>>
>>
>>
>> On 2015-01-05 13:25, Andrew Simper wrote:
>>>
>>> I've taken Sam's ARP transposed SVF design with input mixing and
>>> written a discretization technical paper on it. I've also updated the
>>> SKF (Sallen Key Filter) design I did with input mixing to more
>>> explicitly address using different input signals.
>>>
>>> Idealized circuit diagrams:
>>> http://cytomic.com/files/dsp/SkfInputMixing.jpg
>>> http://cytomic.com/files/dsp/SvfInputMixing.jpg
>>>
>>> Technical papers:
>>> http://cytomic.com/files/dsp/SkfInputMixing.pdf
>>> http://cytomic.com/files/dsp/SvfInputMixing.pdf
>>>
>>> All the best,
>>>
>>> Andrew Simper
>>> -- cytomic -- sound music software --
>>>
>>>
>>> On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>
>>>> Hello Andy and list,
>>>>
>>>> I'm grad you like my schematics.
>>>>
>>>> Multiple point signal injection is a very interesting idea.
>>>> I guess you can get any response from famous filter structure
>>>> keeping the original sound.  Four pole filter such as ladder
>>>> filter may be a good target.
>>>>
>>>> Sam HOSHUYAMA
>>>> Saitama, JAPAN
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>> To: houshu at muj.biglobe.ne.jp
>>>> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>> Sent: Tuesday, December 23, 2014 13:00:39
>>>> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>
>>>> Sam you're a legend!
>>>>
>>>> You just saved me an IEEE membership just to look at one paper and
>>>> some pain in "fixing" the schematics in it. I was really interested in
>>>> the SVF with mixing inputs and you just delivered it straight to me
>>>> with a wonderfully clear LTSpice schematic, thank-you!
>>>>
>>>> I hope I can come up with some more interesting designs to help
>>>> contribute to the synth community like you are doing.
>>>>
>>>> The positive feedback path around the Band section and that you noted
>>>> is from the ARP 4023, it looks like the OSCar also copied this idea -
>>>> thanks for pointing out the original.
>>>>
>>>> Andy
>>>>
>>>> -- cytomic -- sound music software --
>>>>
>>>>
>>>> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>>
>>>>> Hello list,
>>>>>
>>>>> Input mixing structure is possible with state-variable-like filter.
>>>>>
>>>>> http://houshu.at.webry.info/201202/article_1.html
>>>>>
>>>>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>>>>> beautiful frequency response can be obtained from this very
>>>>> simple circuit.
>>>>>
>>>>> Basic structure is like ARP4023, which can be derived from
>>>>> ordinary state variable filter:
>>>>> http://houshu.at.webry.info/200602/article_1.html
>>>>>
>>>>> I built a module with satisfactory results:
>>>>> http://houshu.at.webry.info/201202/article_2.html
>>>>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>>>>> Power consumption is as small as 5mA.
>>>>>
>>>>> I designed it for single supply operation.
>>>>> Bipolar supply operation is possible by changing the
>>>>> exponential converter (Untested):
>>>>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>>>>
>>>>> Sam HOSHUYAMA
>>>>> Saitama, Japan
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>>> Sent: Sunday, December 21, 2014 16:54:23
>>>>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>>
>>>>> Hey guys,
>>>>>
>>>>> I've noticed many Sallen Key synth filters can generate different
>>>>> responses by sticking the input into various points of the circuit,
>>>>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>>>>> I've worked out the theory for generating all the same responses as
>>>>> you can get by mixing the outputs of an State Variable, but instead
>>>>> mixing the inputs to a Sallen Key. I've put together a technical paper
>>>>> on it here:
>>>>>
>>>>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>>>>
>>>>> and I've sketched the basic structure of what is going on here (taking
>>>>> an MS20 v2 type OTA Sallen Key as the basis):
>>>>>
>>>>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>>>>
>>>>> the important voltages are:
>>>>>
>>>>> vamp1 = (m0*v0) - (m1*v0 + v1)
>>>>> vamp2 = (m1*v0 + v1) - (v2)
>>>>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>>>>> vcap2 = (v2) - (m2*v0)
>>>>>
>>>>> where m0 = low mix, m1 = band mix and m2 = high mix
>>>>>
>>>>> Also for those interested in a digital implementation I've also
>>>>> included in the paper is also a trapezoidal integrated linear circuit
>>>>> model use state space increments and high precision coefficient
>>>>> calculation.
>>>>>
>>>>> Andy
>>>>> _______________________________________________
>>>>> 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 andy at cytomic.com  Tue Jan  6 02:53:19 2015
From: andy at cytomic.com (Andrew Simper)
Date: Tue, 6 Jan 2015 09:53:19 +0800
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
	<CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
	<bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>
	<CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
Message-ID: <CAAxOnza0TU5MNbH1m8RhrBYkee40h07C3SaHySW9-162QdVhqw@mail.gmail.com>

On 6 January 2015 at 09:28, Andrew Simper <andy at cytomic.com> wrote:
> On 5 January 2015 at 21:50, <rburnett at richieburnett.co.uk> wrote:
>>
>> Hi Andy,
>>
>> Thanks for sharing this interesting work.
>
> Your welcome!

You're welcome even!


From rburnett at richieburnett.co.uk  Tue Jan  6 14:02:36 2015
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Tue, 6 Jan 2015 13:02:36 -0000
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <CAAxOnzYXSfhgZXyR+0xsxkSkL79=bNF_pXAC0p9WxhDVWuF81w@mail.gmail.com>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com><4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570><CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com><bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk><CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
	<CAAxOnzYXSfhgZXyR+0xsxkSkL79=bNF_pXAC0p9WxhDVWuF81w@mail.gmail.com>
Message-ID: <B370C7472E3B4D04957B83E343ED62AE@RichiePC>

I guess so.  I think I would have just replaced the two whole 
"OTA/capacitor/voltage follower" sections with integrator blocks.  i.e. a 
box with an integrator symbol inside, because that's what those blocks are 
doing.  So it would just be a signal flow diagram then, not an electrical 
schematic/

The part that is most visually confusing for me is the bottoms of C1 and C2 
being connected to something that I don't know the output impedance of.  I'd 
need to think about this some more.  Maybe it's just me that finds it 
difficult to get my head round though, so I wouldn't worry!

Have you tried drawing the whole thing out as a complete analogue circuit? 
I know you're mostly interested in digital modelling, so it's probably 
unwanted extra work for you, but many analogue synth enthusiasts might be 
tempted to try and build prototypes of these filters out of op-amps and OTAs 
if a complete electrical schematic was also presented.

Thanks again for sharing your work,

-Richie,



-----Original Message----- 
From: Andrew Simper
Sent: Tuesday, January 06, 2015 1:52 AM
To: Richie Burnett
Cc: synthdiy diy
Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes

Richie, do these look better?

http://cytomic.com/files/dsp/SvfInputMixing2.jpg
http://cytomic.com/files/dsp/SkfInputMixing2.jpg

Andy
-- cytomic -- sound music software --


On 6 January 2015 at 09:28, Andrew Simper <andy at cytomic.com> wrote:
> On 5 January 2015 at 21:50, <rburnett at richieburnett.co.uk> wrote:
>>
>> Hi Andy,
>>
>> Thanks for sharing this interesting work.
>
> Your welcome!
>
>
>> In the discretization technical paper it would have been interesting to 
>> see the resulting z-domain frequency responses for the digital 
>> realisations of the filters, so that comparisons can be made with the 
>> original s-domain analogue prototypes as the cutoff frequency approaches 
>> the Nyquist limit.  (The s-domain frequency responses are "textbook" 
>> analogue 2nd order shapes, so aren't particularly interesting by 
>> themselves.)
>>
>> -Richie,
>
> It is trapezoidal integration, which gives a cramped response which is
> equivalent to the bi-linear z transform which is why I didn't bother.
> Please read the other papers I wrote for derivations and plotting of
> the z-domain transfer function. I show the derivation of forming the
> z-domain transfer function directly from trapezoidal integration here:
> http://cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf in the
> section "Transfer functions for low, band, high, notch, and peak,
> continuous and discrete"
>
>
>> PS. The mixture of "electrical schematic" and "signal flow" 
>> representations in the same diagrams might be a little confusing to some. 
>> I'm an electronics engineer so am familiar with looking at both, but they 
>> usually aren't mixed in the same diagram.
>
> I originally had little triangle amp blocks but things looked messy.
> Donald posted a link to this paper:
> http://www.ka-electronics.com/images/pdf/Steiner_Filter.pdf , which
> uses a square with a sigma sign in the middle to show a summing block,
> so I used this idea but instead used a more modern + sign in a circle.
> Should I switch it to how Steiner does it with a square and sigma? Is
> that more standard for idealised circuit diagrams? I show the
> development of the notation I used here:
> http://cytomic.com/files/dsp/OnePoleLinearLowPass.pdf with the full
> resistor divider network to use a circle with a + instead, but I am
> happy to change it if there is something just as succinct and more
> standard.
>
> All the best,
>
> Andy
>
>
>>
>>
>>
>>
>>
>>
>> On 2015-01-05 13:25, Andrew Simper wrote:
>>>
>>> I've taken Sam's ARP transposed SVF design with input mixing and
>>> written a discretization technical paper on it. I've also updated the
>>> SKF (Sallen Key Filter) design I did with input mixing to more
>>> explicitly address using different input signals.
>>>
>>> Idealized circuit diagrams:
>>> http://cytomic.com/files/dsp/SkfInputMixing.jpg
>>> http://cytomic.com/files/dsp/SvfInputMixing.jpg
>>>
>>> Technical papers:
>>> http://cytomic.com/files/dsp/SkfInputMixing.pdf
>>> http://cytomic.com/files/dsp/SvfInputMixing.pdf
>>>
>>> All the best,
>>>
>>> Andrew Simper
>>> -- cytomic -- sound music software --
>>>
>>>
>>> On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>
>>>> Hello Andy and list,
>>>>
>>>> I'm grad you like my schematics.
>>>>
>>>> Multiple point signal injection is a very interesting idea.
>>>> I guess you can get any response from famous filter structure
>>>> keeping the original sound.  Four pole filter such as ladder
>>>> filter may be a good target.
>>>>
>>>> Sam HOSHUYAMA
>>>> Saitama, JAPAN
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>> To: houshu at muj.biglobe.ne.jp
>>>> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>> Sent: Tuesday, December 23, 2014 13:00:39
>>>> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>
>>>> Sam you're a legend!
>>>>
>>>> You just saved me an IEEE membership just to look at one paper and
>>>> some pain in "fixing" the schematics in it. I was really interested in
>>>> the SVF with mixing inputs and you just delivered it straight to me
>>>> with a wonderfully clear LTSpice schematic, thank-you!
>>>>
>>>> I hope I can come up with some more interesting designs to help
>>>> contribute to the synth community like you are doing.
>>>>
>>>> The positive feedback path around the Band section and that you noted
>>>> is from the ARP 4023, it looks like the OSCar also copied this idea -
>>>> thanks for pointing out the original.
>>>>
>>>> Andy
>>>>
>>>> -- cytomic -- sound music software --
>>>>
>>>>
>>>> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>>
>>>>> Hello list,
>>>>>
>>>>> Input mixing structure is possible with state-variable-like filter.
>>>>>
>>>>> http://houshu.at.webry.info/201202/article_1.html
>>>>>
>>>>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>>>>> beautiful frequency response can be obtained from this very
>>>>> simple circuit.
>>>>>
>>>>> Basic structure is like ARP4023, which can be derived from
>>>>> ordinary state variable filter:
>>>>> http://houshu.at.webry.info/200602/article_1.html
>>>>>
>>>>> I built a module with satisfactory results:
>>>>> http://houshu.at.webry.info/201202/article_2.html
>>>>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>>>>> Power consumption is as small as 5mA.
>>>>>
>>>>> I designed it for single supply operation.
>>>>> Bipolar supply operation is possible by changing the
>>>>> exponential converter (Untested):
>>>>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>>>>
>>>>> Sam HOSHUYAMA
>>>>> Saitama, Japan
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>>> Sent: Sunday, December 21, 2014 16:54:23
>>>>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>>
>>>>> Hey guys,
>>>>>
>>>>> I've noticed many Sallen Key synth filters can generate different
>>>>> responses by sticking the input into various points of the circuit,
>>>>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>>>>> I've worked out the theory for generating all the same responses as
>>>>> you can get by mixing the outputs of an State Variable, but instead
>>>>> mixing the inputs to a Sallen Key. I've put together a technical paper
>>>>> on it here:
>>>>>
>>>>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>>>>
>>>>> and I've sketched the basic structure of what is going on here (taking
>>>>> an MS20 v2 type OTA Sallen Key as the basis):
>>>>>
>>>>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>>>>
>>>>> the important voltages are:
>>>>>
>>>>> vamp1 = (m0*v0) - (m1*v0 + v1)
>>>>> vamp2 = (m1*v0 + v1) - (v2)
>>>>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>>>>> vcap2 = (v2) - (m2*v0)
>>>>>
>>>>> where m0 = low mix, m1 = band mix and m2 = high mix
>>>>>
>>>>> Also for those interested in a digital implementation I've also
>>>>> included in the paper is also a trapezoidal integrated linear circuit
>>>>> model use state space increments and high precision coefficient
>>>>> calculation.
>>>>>
>>>>> Andy
>>>>> _______________________________________________
>>>>> 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


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4794 / Virus Database: 4253/8880 - Release Date: 01/06/15



From davekendall at ntlworld.com  Tue Jan  6 18:43:44 2015
From: davekendall at ntlworld.com (Dave Kendall)
Date: Tue, 6 Jan 2015 17:43:44 +0000
Subject: [sdiy] Slightly OT: Looking for EFM VCF7B PCB.
Message-ID: <8F4EA3B7-95CB-11E4-A166-000393A85F9E@ntlworld.com>

Hi all.

Apologies for being a bit OT, but I'd like to get hold of one of these 
long out-of-production boards for nostalgia reasons, and have had no 
luck finding one elsewhere.
Some of you were likely on the old EFM forums back in the day, and may 
just possibly have an un-built  or part-built one lying around.
Please contact me off-list if you have any leads. FWIW I'm in the UK .

cheers,
Dave




From andy at cytomic.com  Wed Jan  7 02:42:49 2015
From: andy at cytomic.com (Andrew Simper)
Date: Wed, 7 Jan 2015 09:42:49 +0800
Subject: [sdiy] Sallen Key with input mixing to generate all shapes
In-Reply-To: <B370C7472E3B4D04957B83E343ED62AE@RichiePC>
References: <CAAxOnzaN061Vxk_4pbWuUwqwzzFXweT+3e1z0fLBtRawOYrsWg@mail.gmail.com>
	<4a3ccb1e-5ae1-46b8-9eb8-c0c5c8e1bd00@bvea33570>
	<CAAxOnzakYJApik4tLcTgKM32ER_tZPSOv4vUp6oreJa=C9jCWw@mail.gmail.com>
	<bea58024d371b8cfdee51b7fe73ac36b@richieburnett.co.uk>
	<CAAxOnzYbb3_StkNTwv+jGkxf7xJLisk2kgtzZbpcsx8HmCto7Q@mail.gmail.com>
	<CAAxOnzYXSfhgZXyR+0xsxkSkL79=bNF_pXAC0p9WxhDVWuF81w@mail.gmail.com>
	<B370C7472E3B4D04957B83E343ED62AE@RichiePC>
Message-ID: <CAAxOnzaY8weA_nqG4mvgzeno3H_De1Y-fO-JEu=ogwP5s0tE8w@mail.gmail.com>

On 6 January 2015 at 21:02, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> I guess so.  I think I would have just replaced the two whole
> "OTA/capacitor/voltage follower" sections with integrator blocks.

Integrator blocks would be fine if all the caps were connected to
ground on one end, but otherwise they would just make everything more
confusing.

> i.e. a
> box with an integrator symbol inside, because that's what those blocks are
> doing.  So it would just be a signal flow diagram then, not an electrical
> schematic/

I don't want to draw a signal flow diagram, I want to draw an
idealised circuit, since this is more useful to me, and hopefully to
people wanting to build actual circuits.



> The part that is most visually confusing for me is the bottoms of C1 and C2
> being connected to something that I don't know the output impedance of.  I'd
> need to think about this some more.  Maybe it's just me that finds it
> difficult to get my head round though, so I wouldn't worry!

All triangles are voltage in, voltage out, idealised amps, they are
voltage controlled voltage sources. They have infinite input impedance
and zero output impedance, infinite bandwidth and zero offset. Their
gain is indicated in the middle of the triangle, in the case of the
sigma the gain is 1, but it makes more sense to show this as a
"summing" amp since in a real circuit these will probably be resistor
divider networks as is common at the input stages of OTAs. The bottom
of the capacitors are connected to voltage sources with zero impedance
that will deliver enough current to keep them at the voltage required.
This is the identical situation to the MS20 v2 KLM-307 where the base
of the caps are connected to the output of op-amps:
http://machines.hyperreal.org/manufacturers/Korg/MS-synths/schematics/KLM-307.GIF


> Have you tried drawing the whole thing out as a complete analogue circuit? I
> know you're mostly interested in digital modelling, so it's probably
> unwanted extra work for you, but many analogue synth enthusiasts might be
> tempted to try and build prototypes of these filters out of op-amps and OTAs
> if a complete electrical schematic was also presented.

Sam has done an entire circuit of the input summing SVF here:
http://houshu.at.webry.info/201202/article_2.html

For the SKF version most of the same circuit can be recycled with
minor changes to routing and a single additional op-amp to invert one
of the high pass signal paths. I would love to publish a full
schematic for the input summing SKF (and also another couple of filter
circuits I've designed), but I'm loath to do so without also building
the circuit to make sure it works. I have a couple of months work to
finish before I will have enough spare time to do this. I hope to be
able to contribute the designs to Mutable Instruments' collection of
open source circuits, and get Olivier's help if he has time to fix all
my mistakes and get something that will be robust as I have no
experience in real world circuit design and all the touches needed to
limit currents so things don't get fried.


> Thanks again for sharing your work,
>
> -Richie,

You're welcome, and thanks for the feedback.

Andy


>
>
> -----Original Message----- From: Andrew Simper
> Sent: Tuesday, January 06, 2015 1:52 AM
> To: Richie Burnett
> Cc: synthdiy diy
>
> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>
> Richie, do these look better?
>
> http://cytomic.com/files/dsp/SvfInputMixing2.jpg
> http://cytomic.com/files/dsp/SkfInputMixing2.jpg
>
> Andy
> -- cytomic -- sound music software --
>
>
> On 6 January 2015 at 09:28, Andrew Simper <andy at cytomic.com> wrote:
>>
>> On 5 January 2015 at 21:50, <rburnett at richieburnett.co.uk> wrote:
>>>
>>>
>>> Hi Andy,
>>>
>>> Thanks for sharing this interesting work.
>>
>>
>> Your welcome!
>>
>>
>>> In the discretization technical paper it would have been interesting to
>>> see the resulting z-domain frequency responses for the digital realisations
>>> of the filters, so that comparisons can be made with the original s-domain
>>> analogue prototypes as the cutoff frequency approaches the Nyquist limit.
>>> (The s-domain frequency responses are "textbook" analogue 2nd order shapes,
>>> so aren't particularly interesting by themselves.)
>>>
>>> -Richie,
>>
>>
>> It is trapezoidal integration, which gives a cramped response which is
>> equivalent to the bi-linear z transform which is why I didn't bother.
>> Please read the other papers I wrote for derivations and plotting of
>> the z-domain transfer function. I show the derivation of forming the
>> z-domain transfer function directly from trapezoidal integration here:
>> http://cytomic.com/files/dsp/SvfLinearTrapOptimised2.pdf in the
>> section "Transfer functions for low, band, high, notch, and peak,
>> continuous and discrete"
>>
>>
>>> PS. The mixture of "electrical schematic" and "signal flow"
>>> representations in the same diagrams might be a little confusing to some.
>>> I'm an electronics engineer so am familiar with looking at both, but they
>>> usually aren't mixed in the same diagram.
>>
>>
>> I originally had little triangle amp blocks but things looked messy.
>> Donald posted a link to this paper:
>> http://www.ka-electronics.com/images/pdf/Steiner_Filter.pdf , which
>> uses a square with a sigma sign in the middle to show a summing block,
>> so I used this idea but instead used a more modern + sign in a circle.
>> Should I switch it to how Steiner does it with a square and sigma? Is
>> that more standard for idealised circuit diagrams? I show the
>> development of the notation I used here:
>> http://cytomic.com/files/dsp/OnePoleLinearLowPass.pdf with the full
>> resistor divider network to use a circle with a + instead, but I am
>> happy to change it if there is something just as succinct and more
>> standard.
>>
>> All the best,
>>
>> Andy
>>
>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 2015-01-05 13:25, Andrew Simper wrote:
>>>>
>>>>
>>>> I've taken Sam's ARP transposed SVF design with input mixing and
>>>> written a discretization technical paper on it. I've also updated the
>>>> SKF (Sallen Key Filter) design I did with input mixing to more
>>>> explicitly address using different input signals.
>>>>
>>>> Idealized circuit diagrams:
>>>> http://cytomic.com/files/dsp/SkfInputMixing.jpg
>>>> http://cytomic.com/files/dsp/SvfInputMixing.jpg
>>>>
>>>> Technical papers:
>>>> http://cytomic.com/files/dsp/SkfInputMixing.pdf
>>>> http://cytomic.com/files/dsp/SvfInputMixing.pdf
>>>>
>>>> All the best,
>>>>
>>>> Andrew Simper
>>>> -- cytomic -- sound music software --
>>>>
>>>>
>>>> On 24 December 2014 at 23:44,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>>
>>>>>
>>>>> Hello Andy and list,
>>>>>
>>>>> I'm grad you like my schematics.
>>>>>
>>>>> Multiple point signal injection is a very interesting idea.
>>>>> I guess you can get any response from famous filter structure
>>>>> keeping the original sound.  Four pole filter such as ladder
>>>>> filter may be a good target.
>>>>>
>>>>> Sam HOSHUYAMA
>>>>> Saitama, JAPAN
>>>>>
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>>> To: houshu at muj.biglobe.ne.jp
>>>>> Cc: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>>> Sent: Tuesday, December 23, 2014 13:00:39
>>>>> Subject: Re: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>>
>>>>> Sam you're a legend!
>>>>>
>>>>> You just saved me an IEEE membership just to look at one paper and
>>>>> some pain in "fixing" the schematics in it. I was really interested in
>>>>> the SVF with mixing inputs and you just delivered it straight to me
>>>>> with a wonderfully clear LTSpice schematic, thank-you!
>>>>>
>>>>> I hope I can come up with some more interesting designs to help
>>>>> contribute to the synth community like you are doing.
>>>>>
>>>>> The positive feedback path around the Band section and that you noted
>>>>> is from the ARP 4023, it looks like the OSCar also copied this idea -
>>>>> thanks for pointing out the original.
>>>>>
>>>>> Andy
>>>>>
>>>>> -- cytomic -- sound music software --
>>>>>
>>>>>
>>>>> On 23 December 2014 at 09:34,  <houshu at muj.biglobe.ne.jp> wrote:
>>>>>>
>>>>>>
>>>>>> Hello list,
>>>>>>
>>>>>> Input mixing structure is possible with state-variable-like filter.
>>>>>>
>>>>>> http://houshu.at.webry.info/201202/article_1.html
>>>>>>
>>>>>> HPF response is 12dB/oct not 6dB/oct. Multiple functions with
>>>>>> beautiful frequency response can be obtained from this very
>>>>>> simple circuit.
>>>>>>
>>>>>> Basic structure is like ARP4023, which can be derived from
>>>>>> ordinary state variable filter:
>>>>>> http://houshu.at.webry.info/200602/article_1.html
>>>>>>
>>>>>> I built a module with satisfactory results:
>>>>>> http://houshu.at.webry.info/201202/article_2.html
>>>>>> http://houshu.at.webry.info/201411/img22_1.141731631693745480177.html
>>>>>> Power consumption is as small as 5mA.
>>>>>>
>>>>>> I designed it for single supply operation.
>>>>>> Bipolar supply operation is possible by changing the
>>>>>> exponential converter (Untested):
>>>>>> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
>>>>>>
>>>>>> Sam HOSHUYAMA
>>>>>> Saitama, Japan
>>>>>>
>>>>>> ----- Original Message -----
>>>>>> From: "Andrew Simper" <andy at cytomic.com>
>>>>>> To: "synthdiy diy" <synth-diy at dropmix.xs4all.nl>
>>>>>> Sent: Sunday, December 21, 2014 16:54:23
>>>>>> Subject: [sdiy] Sallen Key with input mixing to generate all shapes
>>>>>>
>>>>>> Hey guys,
>>>>>>
>>>>>> I've noticed many Sallen Key synth filters can generate different
>>>>>> responses by sticking the input into various points of the circuit,
>>>>>> but they only ever deliver a 1 pole high pass, and a very weak notch.
>>>>>> I've worked out the theory for generating all the same responses as
>>>>>> you can get by mixing the outputs of an State Variable, but instead
>>>>>> mixing the inputs to a Sallen Key. I've put together a technical paper
>>>>>> on it here:
>>>>>>
>>>>>> https://cytomic.com/files/dsp/SkfLinearTrapezoidalSin.pdf
>>>>>>
>>>>>> and I've sketched the basic structure of what is going on here (taking
>>>>>> an MS20 v2 type OTA Sallen Key as the basis):
>>>>>>
>>>>>> www.cytomic.com/files/dsp/SkfInputMixing.jpg
>>>>>>
>>>>>> the important voltages are:
>>>>>>
>>>>>> vamp1 = (m0*v0) - (m1*v0 + v1)
>>>>>> vamp2 = (m1*v0 + v1) - (v2)
>>>>>> vcap1 = (v1) - (res*v2 + m2*(-v0))
>>>>>> vcap2 = (v2) - (m2*v0)
>>>>>>
>>>>>> where m0 = low mix, m1 = band mix and m2 = high mix
>>>>>>
>>>>>> Also for those interested in a digital implementation I've also
>>>>>> included in the paper is also a trapezoidal integrated linear circuit
>>>>>> model use state space increments and high precision coefficient
>>>>>> calculation.
>>>>>>
>>>>>> Andy
>>>>>> _______________________________________________
>>>>>> 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
>
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2014.0.4794 / Virus Database: 4253/8880 - Release Date: 01/06/15
>


From admin at bugbrand.co.uk  Wed Jan  7 10:40:29 2015
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Wed, 07 Jan 2015 09:40:29 +0000
Subject: [sdiy] DG409LDY for cheap UK
Message-ID: <54ACFF0D.3090007@bugbrand.co.uk>

Would anyone in the UK like 17 x DG409LDY parts brand new - SMD Low 
Voltage SOIC16
I bought some without noticing the L in the part code.. no wonder I blew 
some bits up!
They're usually c.?1 a pop but I'd happily sell the lot for ?10 inc. 
shipping.
Shout if interested!
Thanks, Tom

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk



From crystals at sonic.net  Thu Jan  8 07:16:23 2015
From: crystals at sonic.net (crystal)
Date: Wed, 07 Jan 2015 22:16:23 -0800
Subject: [sdiy] Slightly OT: Looking for EFM VCF7B PCB.
In-Reply-To: <8F4EA3B7-95CB-11E4-A166-000393A85F9E@ntlworld.com>
References: <8F4EA3B7-95CB-11E4-A166-000393A85F9E@ntlworld.com>
Message-ID: <54AE20B7.9070203@sonic.net>

  I would be interested in any of the other EFM filter pcbs if anyone 
has them and would like to trade them off for something useful.

cheers,
crystal



Dave Kendall wrote:
> Hi all.
>
> Apologies for being a bit OT, but I'd like to get hold of one of these 
> long out-of-production boards for nostalgia reasons, and have had no 
> luck finding one elsewhere.
> Some of you were likely on the old EFM forums back in the day, and may 
> just possibly have an un-built  or part-built one lying around.
> Please contact me off-list if you have any leads. FWIW I'm in the UK .
>
> cheers,
> Dave
>
>



From rutgervlek at gmail.com  Thu Jan  8 11:56:20 2015
From: rutgervlek at gmail.com (Rutger Vlek)
Date: Thu, 8 Jan 2015 11:56:20 +0100
Subject: [sdiy] Silly simple question, input switching
Message-ID: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>

Hi guys,

I have a very silly, simple question that I don't know the answer to. Perhaps you know?

Let's say I have an inverting op-amp (on bipolar supply) with 100K in the feedback path and I want it to have an input that can be switched (with a SPDT) between 50K DC or 100K AC-coupled, where would I place the switch?

Two scenario's:
a) Signal flows into two resistors 50K and (a series cap+) 100K connected in parallel, the switch comes after and selects which one will get a conductive path to the inverting input of the op amp.

b) The signal goes into the switch first and depending on the position gets fed into a 50K or (cap +) 100K resistor, both of which are always connected to the inverting input of the opamp.

Which scenario would you choose? I'm mostly concerned about the PCB trace length through the switch and possible chances for picking up noise in the case of a). Intuitively that feels like a bigger problem than op amp input resistors that are left floating with a moderately high impedance in the case of b). The question is, is my intuition right? And does everything hold when the switch becomes an electronic switch (for instance a DG-40x series), rather than a manual toggle?

Best,

Rutger

From rburnett at richieburnett.co.uk  Thu Jan  8 12:25:10 2015
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Thu, 08 Jan 2015 11:25:10 +0000
Subject: [sdiy] Silly simple question, input switching
In-Reply-To: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>
References: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>
Message-ID: <9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>

Scenario b for exactly the reasons you say.

You could use a multiple pole switch and arrange for the floating input path to be grounded if you were worried about picking up interference. However, doing this will increase the noise gain of the amplifier, so probably best to leave the unused input floating and put the whole thing in a screened metal box.

There is also another way of doing it. You could feed the input through a series combination of 50k+50k+cap and then use a single pole single throw switch to optionally short out (bypass) the last 50k+cap section when you want the 50k dc coupled option. Conversely with the switch open you get 100kHz plus your account coupling capacitor. Just another way of doing it that doesn't result in a floating high impedance input, if you're worried about that! 

-Richie, 


Sent from my Xperia SP on O2

---- Rutger Vlek wrote ----

>Hi guys,
>
>I have a very silly, simple question that I don't know the answer to. Perhaps you know?
>
>Let's say I have an inverting op-amp (on bipolar supply) with 100K in the feedback path and I want it to have an input that can be switched (with a SPDT) between 50K DC or 100K AC-coupled, where would I place the switch?
>
>Two scenario's:
>a) Signal flows into two resistors 50K and (a series cap+) 100K connected in parallel, the switch comes after and selects which one will get a conductive path to the inverting input of the op amp.
>
>b) The signal goes into the switch first and depending on the position gets fed into a 50K or (cap +) 100K resistor, both of which are always connected to the inverting input of the opamp.
>
>Which scenario would you choose? I'm mostly concerned about the PCB trace length through the switch and possible chances for picking up noise in the case of a). Intuitively that feels like a bigger problem than op amp input resistors that are left floating with a moderately high impedance in the case of b). The question is, is my intuition right? And does everything hold when the switch becomes an electronic switch (for instance a DG-40x series), rather than a manual toggle?
>
>Best,
>
>Rutger
>_______________________________________________
>Synth-diy mailing list
>Synth-diy at dropmix.xs4all.nl
>http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

From rburnett at richieburnett.co.uk  Thu Jan  8 12:34:33 2015
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Thu, 08 Jan 2015 11:34:33 +0000
Subject: [sdiy] Silly simple question, input switching
In-Reply-To: <9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>
References: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>
	<9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>
Message-ID: <ybf1orq31imv8d6updvmf2es.1420716873532@email.android.com>

Sorry, that should have read:

" Conversely with the switch open you get 100k plus your ac coupling capacitor. "

Cursing my phone's auto-correct :-(

Sent from my Xperia SP on O2

From tom at electricdruid.net  Thu Jan  8 12:35:08 2015
From: tom at electricdruid.net (Tom Wiltshire)
Date: Thu, 8 Jan 2015 11:35:08 +0000
Subject: [sdiy] Silly simple question, input switching
In-Reply-To: <9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>
References: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>
	<9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>
Message-ID: <F09120FA-C1C5-4FAF-AE12-2F84D414CF41@electricdruid.net>

I like Richie's single pole switch idea. Put two 50K resistors in series with the cap, and then short out the one resistor and the cap for the DC coupled input.

That'll work well for a electronic switch too, since the on resistance of the switch will be small compared to the 50K, so Ron variations won't affect anything much.

On 8 Jan 2015, at 11:25, Richie Burnett <rburnett at richieburnett.co.uk> wrote:

> Scenario b for exactly the reasons you say.
> 
> You could use a multiple pole switch and arrange for the floating input path to be grounded if you were worried about picking up interference. However, doing this will increase the noise gain of the amplifier, so probably best to leave the unused input floating and put the whole thing in a screened metal box.
> 
> There is also another way of doing it. You could feed the input through a series combination of 50k+50k+cap and then use a single pole single throw switch to optionally short out (bypass) the last 50k+cap section when you want the 50k dc coupled option. Conversely with the switch open you get 100kHz plus your account coupling capacitor. Just another way of doing it that doesn't result in a floating high impedance input, if you're worried about that! 
> 
> -Richie, 
> 
> 
> Sent from my Xperia SP on O2
> 
> ---- Rutger Vlek wrote ----
> 
>> Hi guys,
>> 
>> I have a very silly, simple question that I don't know the answer to. Perhaps you know?
>> 
>> Let's say I have an inverting op-amp (on bipolar supply) with 100K in the feedback path and I want it to have an input that can be switched (with a SPDT) between 50K DC or 100K AC-coupled, where would I place the switch?
>> 
>> Two scenario's:
>> a) Signal flows into two resistors 50K and (a series cap+) 100K connected in parallel, the switch comes after and selects which one will get a conductive path to the inverting input of the op amp.
>> 
>> b) The signal goes into the switch first and depending on the position gets fed into a 50K or (cap +) 100K resistor, both of which are always connected to the inverting input of the opamp.
>> 
>> Which scenario would you choose? I'm mostly concerned about the PCB trace length through the switch and possible chances for picking up noise in the case of a). Intuitively that feels like a bigger problem than op amp input resistors that are left floating with a moderately high impedance in the case of b). The question is, is my intuition right? And does everything hold when the switch becomes an electronic switch (for instance a DG-40x series), rather than a manual toggle?
>> 
>> Best,
>> 
>> Rutger
>> _______________________________________________
>> 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 davekendall at ntlworld.com  Thu Jan  8 12:42:43 2015
From: davekendall at ntlworld.com (Dave Kendall)
Date: Thu, 8 Jan 2015 11:42:43 +0000
Subject: [sdiy] Slightly OT: Looking for EFM VCF7B PCB.
In-Reply-To: <CADD61nU1X0HPPEMeG3ap10RuS63qQZm7eD-PBTdZ0TxxOQphww@mail.gmail.com>
References: <8F4EA3B7-95CB-11E4-A166-000393A85F9E@ntlworld.com>
	<CADD61nU1X0HPPEMeG3ap10RuS63qQZm7eD-PBTdZ0TxxOQphww@mail.gmail.com>
Message-ID: <751CDE14-972B-11E4-9F10-000393A85F9E@ntlworld.com>

Thanks Kylee, but it is the actual EFM board I'm after.

FWIW, Yves Usson also did a clone, and it has added loudness 
compensation for increased resonance, which sounds useful.

cheers,
Dave


On 6 Jan 2015, at 17:57, Kylee Kennedy wrote:

> There are a couple ARP cloners out there now...
> http://steffcorp.se/
> and
> http://www.amsynths.co.uk/
> ...and others.
> Hope that helps.
>
> Kylee
>
> On Tuesday, January 6, 2015, Dave Kendall <davekendall at ntlworld.com> 
> wrote:
> Hi all.
>
>  Apologies for being a bit OT, but I'd like to get hold of one of 
> these long out-of-production boards for nostalgia reasons, and have 
> had no luck finding one elsewhere.
>  Some of you were likely on the old EFM forums back in the day, and 
> may just possibly have an un-built? or part-built one lying around.
>  Please contact me off-list if you have any leads. FWIW I'm in the UK .
>
>  cheers,
>  Dave
>
>
>  _______________________________________________
>  Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From rutgervlek at gmail.com  Thu Jan  8 20:38:59 2015
From: rutgervlek at gmail.com (Rutger Vlek)
Date: Thu, 8 Jan 2015 20:38:59 +0100
Subject: [sdiy] Silly simple question, input switching
In-Reply-To: <F09120FA-C1C5-4FAF-AE12-2F84D414CF41@electricdruid.net>
References: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com>
	<9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com>
	<F09120FA-C1C5-4FAF-AE12-2F84D414CF41@electricdruid.net>
Message-ID: <BD60ED7D-1F67-42EE-A6FB-D119ADCF5B45@gmail.com>

Thanks! Great idea! I'll give it a try. Though for DC blocking the caps the first element in the series of course;).

Rutger


On 8 jan 2015, at 12:35, Tom Wiltshire wrote:

> I like Richie's single pole switch idea. Put two 50K resistors in series with the cap, and then short out the one resistor and the cap for the DC coupled input.
> 
> That'll work well for a electronic switch too, since the on resistance of the switch will be small compared to the 50K, so Ron variations won't affect anything much.
> 
> On 8 Jan 2015, at 11:25, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
>> Scenario b for exactly the reasons you say.
>> 
>> You could use a multiple pole switch and arrange for the floating input path to be grounded if you were worried about picking up interference. However, doing this will increase the noise gain of the amplifier, so probably best to leave the unused input floating and put the whole thing in a screened metal box.
>> 
>> There is also another way of doing it. You could feed the input through a series combination of 50k+50k+cap and then use a single pole single throw switch to optionally short out (bypass) the last 50k+cap section when you want the 50k dc coupled option. Conversely with the switch open you get 100kHz plus your account coupling capacitor. Just another way of doing it that doesn't result in a floating high impedance input, if you're worried about that! 
>> 
>> -Richie, 
>> 
>> 
>> Sent from my Xperia SP on O2
>> 
>> ---- Rutger Vlek wrote ----
>> 
>>> Hi guys,
>>> 
>>> I have a very silly, simple question that I don't know the answer to. Perhaps you know?
>>> 
>>> Let's say I have an inverting op-amp (on bipolar supply) with 100K in the feedback path and I want it to have an input that can be switched (with a SPDT) between 50K DC or 100K AC-coupled, where would I place the switch?
>>> 
>>> Two scenario's:
>>> a) Signal flows into two resistors 50K and (a series cap+) 100K connected in parallel, the switch comes after and selects which one will get a conductive path to the inverting input of the op amp.
>>> 
>>> b) The signal goes into the switch first and depending on the position gets fed into a 50K or (cap +) 100K resistor, both of which are always connected to the inverting input of the opamp.
>>> 
>>> Which scenario would you choose? I'm mostly concerned about the PCB trace length through the switch and possible chances for picking up noise in the case of a). Intuitively that feels like a bigger problem than op amp input resistors that are left floating with a moderately high impedance in the case of b). The question is, is my intuition right? And does everything hold when the switch becomes an electronic switch (for instance a DG-40x series), rather than a manual toggle?
>>> 
>>> Best,
>>> 
>>> Rutger
>>> _______________________________________________
>>> 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 dixon at mail.ubc.ca  Thu Jan  8 20:50:27 2015
From: dixon at mail.ubc.ca (David G Dixon)
Date: Thu, 8 Jan 2015 11:50:27 -0800
Subject: [sdiy] Silly simple question, input switching
In-Reply-To: <BD60ED7D-1F67-42EE-A6FB-D119ADCF5B45@gmail.com>
References: <DAD138B8-4C2A-4690-8781-A8CFC8E13E2F@gmail.com><9mihv9lyht95yelaqntkvc6c.1420716310002@email.android.com><F09120FA-C1C5-4FAF-AE12-2F84D414CF41@electricdruid.net>
	<BD60ED7D-1F67-42EE-A6FB-D119ADCF5B45@gmail.com>
Message-ID: <2267DBCC718F4ED5B7238276F72F1644@galvanox01>

That sounds like a great idea, but I'm wondering whether there shouldn't
also be a high-R shunting resistor to ground on the bypassable path to
discharge the cap when it is bypassed...?
 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Rutger Vlek
> Sent: Thursday, January 08, 2015 11:39 AM
> To: Synth diy
> Subject: Re: [sdiy] Silly simple question, input switching
> 
> Thanks! Great idea! I'll give it a try. Though for DC 
> blocking the caps the first element in the series of course;).
> 
> Rutger
> 
> 
> On 8 jan 2015, at 12:35, Tom Wiltshire wrote:
> 
> > I like Richie's single pole switch idea. Put two 50K 
> resistors in series with the cap, and then short out the one 
> resistor and the cap for the DC coupled input.
> > 
> > That'll work well for a electronic switch too, since the on 
> resistance of the switch will be small compared to the 50K, 
> so Ron variations won't affect anything much.
> > 
> > On 8 Jan 2015, at 11:25, Richie Burnett 
> <rburnett at richieburnett.co.uk> wrote:
> > 
> >> Scenario b for exactly the reasons you say.
> >> 
> >> You could use a multiple pole switch and arrange for the 
> floating input path to be grounded if you were worried about 
> picking up interference. However, doing this will increase 
> the noise gain of the amplifier, so probably best to leave 
> the unused input floating and put the whole thing in a 
> screened metal box.
> >> 
> >> There is also another way of doing it. You could feed the 
> input through a series combination of 50k+50k+cap and then 
> use a single pole single throw switch to optionally short out 
> (bypass) the last 50k+cap section when you want the 50k dc 
> coupled option. Conversely with the switch open you get 
> 100kHz plus your account coupling capacitor. Just another way 
> of doing it that doesn't result in a floating high impedance 
> input, if you're worried about that! 
> >> 
> >> -Richie,
> >> 
> >> 
> >> Sent from my Xperia SP on O2
> >> 
> >> ---- Rutger Vlek wrote ----
> >> 
> >>> Hi guys,
> >>> 
> >>> I have a very silly, simple question that I don't know 
> the answer to. Perhaps you know?
> >>> 
> >>> Let's say I have an inverting op-amp (on bipolar supply) 
> with 100K in the feedback path and I want it to have an input 
> that can be switched (with a SPDT) between 50K DC or 100K 
> AC-coupled, where would I place the switch?
> >>> 
> >>> Two scenario's:
> >>> a) Signal flows into two resistors 50K and (a series 
> cap+) 100K connected in parallel, the switch comes after and 
> selects which one will get a conductive path to the inverting 
> input of the op amp.
> >>> 
> >>> b) The signal goes into the switch first and depending on 
> the position gets fed into a 50K or (cap +) 100K resistor, 
> both of which are always connected to the inverting input of 
> the opamp.
> >>> 
> >>> Which scenario would you choose? I'm mostly concerned 
> about the PCB trace length through the switch and possible 
> chances for picking up noise in the case of a). Intuitively 
> that feels like a bigger problem than op amp input resistors 
> that are left floating with a moderately high impedance in 
> the case of b). The question is, is my intuition right? And 
> does everything hold when the switch becomes an electronic 
> switch (for instance a DG-40x series), rather than a manual toggle?
> >>> 
> >>> Best,
> >>> 
> >>> Rutger
> >>> _______________________________________________
> >>> 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 fanwander at mnet-online.de  Sat Jan 10 13:04:58 2015
From: fanwander at mnet-online.de (florian anwander)
Date: Sat, 10 Jan 2015 13:04:58 +0100
Subject: [sdiy] *4175*
Message-ID: <54B1156A.8080808@mnet-online.de>

Hello

I am looking for 4175 Quad D-Flip-Flop ICs, but I don't find them in any 
webshop here in Germany. Are they discontinued?

Florian


From Peter.Ullrich at kapsch.net  Sat Jan 10 13:27:41 2015
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Sat, 10 Jan 2015 12:27:41 +0000
Subject: [sdiy] *4175*
In-Reply-To: <54B1156A.8080808@mnet-online.de>
References: <54B1156A.8080808@mnet-online.de>
Message-ID: <8BF8151491B683469DBE3534B77A7286DB70A28F@S900X027.kapsch.co.at>

Hi Florian!

It seems that Onsemi skipped the DIP version, only SOIC is left.

But on Ebay you can still buy the DIL version:

http://www.ebay.de/itm/MC14175BCP-4-fach-D-Flip-Flop-mit-kompl-Ausgang-CMOS-IC-4175-DIP16-1St-/281546941411?pt=Bauteile&hash=item418d8163e3

Ciao
Peter

http://www.ullrich.at.tt

________________________________________
Von: synth-diy-bounces at dropmix.xs4all.nl [synth-diy-bounces at dropmix.xs4all.nl]&quot; im Auftrag von &quot;florian anwander [fanwander at mnet-online.de]
Gesendet: Samstag, 10. J?nner 2015 13:04
An: synthdiy diy
Betreff: [sdiy] *4175*

Hello

I am looking for 4175 Quad D-Flip-Flop ICs, but I don't find them in any
webshop here in Germany. Are they discontinued?

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



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, and is kindly asked to notify the sender and delete the e-mail immediately.



From fanwander at mnet-online.de  Sat Jan 10 14:04:26 2015
From: fanwander at mnet-online.de (florian anwander)
Date: Sat, 10 Jan 2015 14:04:26 +0100
Subject: [sdiy] ODP:  *4175*
In-Reply-To: <rfosshnyxi4a5pb77hbwl35m.1420893939483@email.android.com>
References: <54B1156A.8080808@mnet-online.de>
	<rfosshnyxi4a5pb77hbwl35m.1420893939483@email.android.com>
Message-ID: <54B1235A.80803@mnet-online.de>

Hello Roman

Thanks for the offer. (and thanks to Peter too)

I've got some already from ebay, but I had thought about using them in a 
small series. So will have to do it some other way.

Florian

Am 10.01.2015 um 13:45 schrieb Roman Sowa:
> That's so funny! I just bought a bunch of CD40175 two days ago for
> broken synth repair. First DIP logic curcuit I bought in years.
> It's 15V CMOS part. Mail me if you want one.
> BTW it's from tme.eu <http://tme.eu>
>
> Roman
>
> ---- U?ytkownik florian anwander napisa? ----
>
>  > Hello
>  >
>  > I am looking for 4175 Quad D-Flip-Flop ICs, but I don't find them in any
>  > webshop here in Germany. Are they discontinued?
>  >
>  > Florian
>  > _______________________________________________
>  > Synth-diy mailing list
>  > Synth-diy at dropmix.xs4all.nl <mailto:Synth-diy at dropmix.xs4all.nl>
>  > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From steve at bendentech.co.uk  Sat Jan 10 18:08:40 2015
From: steve at bendentech.co.uk (Steve Lenham)
Date: Sat, 10 Jan 2015 17:08:40 +0000
Subject: [sdiy] *4175*
In-Reply-To: <54B1156A.8080808@mnet-online.de>
References: <54B1156A.8080808@mnet-online.de>
Message-ID: <54B15C98.4020209@bendentech.co.uk>

I think the (MC1)4175 is the same as the CD40175, which is listed as 
active in both DIP and SOIC by TI and available from Farnell, etc...

HTH,

Steve L.

On 10/01/2015 12:04, florian anwander wrote:
> Hello
>
> I am looking for 4175 Quad D-Flip-Flop ICs, but I don't find them in any
> webshop here in Germany. Are they discontinued?
>
> Florian
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



From fanwander at mnet-online.de  Sat Jan 10 19:04:49 2015
From: fanwander at mnet-online.de (Florian Anwander)
Date: Sat, 10 Jan 2015 19:04:49 +0100
Subject: [sdiy] *4175*
In-Reply-To: <54B15C98.4020209@bendentech.co.uk>
References: <54B1156A.8080808@mnet-online.de>
	<54B15C98.4020209@bendentech.co.uk>
Message-ID: <54B169C1.6020301@mnet-online.de>

Hello Steve,

Indeed I get the CD40175 here as DIP at some resellers. That saves me 
from redesigning the pcb. Thank you!

Florian

On 10.01.15 18:08 , Steve Lenham wrote:
> I think the (MC1)4175 is the same as the CD40175, which is listed as
> active in both DIP and SOIC by TI and available from Farnell, etc...


From Barry.L.Klein at wdc.com  Tue Jan 13 19:40:40 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Tue, 13 Jan 2015 18:40:40 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>

An update and feeble cry for help on the Andromeda repair...
I checked with a scope most of the I/O, supplies, and crystal oscillators - ok.
I replaced the CPU of the main board with a new part.
The unit now will sometimes be "willing" to go into the (press 7) bootloader page or (press 2) front panel test page.
With a press 7 I can upload the latest OS - it loaded successfully the last time I tried (once).  It then says to hit "store" and it writes to flash.
Here it hangs on Verify block 14.
It will also hang on the test of the slow ram - NVRAM.
I have ordered a replacement part from China...
I am a bit confused though about the memory management.
There is a Flash, NV SRAM, and two "high speed" SRAM chips.
Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?
Anyone know if really there is a separate bootloader sysx file?  There is a discussion on a forum about this (which wasn't answered).
I guess not to worry for me if I can manage to get a successful sysx file dump over.(?)  It is the then write to flash that chokes.
Should I shotgun this and also replace the SRAM chips while I'm at it?
I'm wondering why it is so flakey to get it to go into the various soft button test modes - takes many tries and then it will do it for some time repetitively on demand.
Something not quite kosher is the flash chip select.  3.3V part with 4V /CS.  Has a series "current limiting" resistor.
As a last resort I may "sprinkle" some ceramic caps near VDD pins.  They used a lot of .01uF's and maybe .1's would be better.

Barry


From gordonjcp at gjcp.net  Tue Jan 13 19:50:51 2015
From: gordonjcp at gjcp.net (gordonjcp at gjcp.net)
Date: Tue, 13 Jan 2015 18:50:51 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl>
	<20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz> <E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
Message-ID: <20150113185051.GC28785@gjcp.net>

On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote:
> I am a bit confused though about the memory management.
> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?

Yes, if they share a common SPI bus (or parts of it).

-- 
Gordonjcp MM0YEQ




From Barry.L.Klein at wdc.com  Tue Jan 13 20:00:33 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Tue, 13 Jan 2015 19:00:33 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <20150113185051.GC28785@gjcp.net>
References: <54860C7B.6050006@artefacts.nl>
	<20141209102214.GD23764@aym.net2.nerim.net>	<RmMF1p01J4AXc3W01mMKUz>
	<E68B1FD97DB24312A9949339294556B1@Mick>	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<20150113185051.GC28785@gjcp.net>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C155@wdscexmb06.sc.wdc.com>

No SPI, old school parallel busses.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of gordonjcp at gjcp.net
Sent: Tuesday, January 13, 2015 10:51 AM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Andromeda A6 repair?

On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote:
> I am a bit confused though about the memory management.
> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?

Yes, if they share a common SPI bus (or parts of it).

-- 
Gordonjcp MM0YEQ


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


From carlosrochaportela at gmail.com  Tue Jan 13 20:01:18 2015
From: carlosrochaportela at gmail.com (Carlos Portela)
Date: Tue, 13 Jan 2015 20:01:18 +0100
Subject: [sdiy] sh09 cv out drops again
Message-ID: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>

Hi all,

After 2 months I turn the sh09 on and the cv out/pitch drops when it
is on VCA hold.

Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
TL072. the problem persist.

Again removed the 2x 2sk30A GR to test them. After re-solder them the
pitch was stable.
I found that's (maybe) because of the heat from the iron.
10 min later was drooping again.

Also checked the sample and hold from lfo section (last time I
switched the sample n hold FET with the keyboard tracking FET) and
there was a kind of portmento between the played notes...

Any ideas what might be causing this? Bad Fets?


From rburnett at richieburnett.co.uk  Tue Jan 13 21:17:08 2015
From: rburnett at richieburnett.co.uk (Richie Burnett)
Date: Tue, 13 Jan 2015 20:17:08 -0000
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
Message-ID: <4DC60BF32CE5444BA6A60412A492E622@RichiePC>

damp / condensation after bringing it from a cold environment into a warm 
damp environment, maybe?

-Richie,

-----Original Message----- 
From: Carlos Portela
Sent: Tuesday, January 13, 2015 7:01 PM
To: Synth-Diy
Subject: [sdiy] sh09 cv out drops again

Hi all,

After 2 months I turn the sh09 on and the cv out/pitch drops when it
is on VCA hold.

Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
TL072. the problem persist.

Again removed the 2x 2sk30A GR to test them. After re-solder them the
pitch was stable.
I found that's (maybe) because of the heat from the iron.
10 min later was drooping again.

Also checked the sample and hold from lfo section (last time I
switched the sample n hold FET with the keyboard tracking FET) and
there was a kind of portmento between the played notes...

Any ideas what might be causing this? Bad Fets?
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 2014.0.4800 / Virus Database: 4257/8923 - Release Date: 01/13/15 



From grant at musictechnologiesgroup.com  Tue Jan 13 21:48:09 2015
From: grant at musictechnologiesgroup.com (MTG)
Date: Tue, 13 Jan 2015 12:48:09 -0800
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C155@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl>	<20141209102214.GD23764@aym.net2.nerim.net>	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>	<548AD727.1060005@go2.pl>	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>	<20150113185051.GC28785@gjcp.net>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C155@wdscexmb06.sc.wdc.com>
Message-ID: <54B58489.4090702@musictechnologiesgroup.com>

Hi Barry,


NV SRAM being what?  A DIP with a battery built in?  Do you have a part 
number for that?

I've seen SRAM of just about every flavour fail at one time or other, 
but if there are mis-matched logic families that might account for a lot 
of really hard-to-put-a-finger-on trouble.

I wonder if the CS with the resistor might be better served with a 
diode?  What year is this thing ... are we talking mostly SMD?

GB


On 1/13/2015 11:00 AM, Barry Klein wrote:
> No SPI, old school parallel busses.
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of gordonjcp at gjcp.net
> Sent: Tuesday, January 13, 2015 10:51 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Andromeda A6 repair?
>
> On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote:
>> I am a bit confused though about the memory management.
>> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
>> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?
>
> Yes, if they share a common SPI bus (or parts of it).
>


From tokalo at videotron.ca  Tue Jan 13 22:01:26 2015
From: tokalo at videotron.ca (Videotron)
Date: Tue, 13 Jan 2015 16:01:26 -0500
Subject: [sdiy] TR-909 switch source
In-Reply-To: <op.xsfdl8lt414kda@computer>
References: <op.xsfdl8lt414kda@computer>
Message-ID: <F9D7BF11-0171-4A88-8791-2430AC882E25@videotron.ca>

Technology Transplant.

Tony K

> On Jan 13, 2015, at 6:45 PM, Greg Zifcak <greg at gzifcak.net> wrote:
> 
> Hello,
> I'm in search of a source for some replacement switches for the step keys on a 909. Syntaur is no longer able to provide them.
> Thanks for any leads,
> Greg
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From Barry.L.Klein at wdc.com  Tue Jan 13 22:32:32 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Tue, 13 Jan 2015 21:32:32 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <54B58489.4090702@musictechnologiesgroup.com>
References: <54860C7B.6050006@artefacts.nl>
	<20141209102214.GD23764@aym.net2.nerim.net>	<RmMF1p01J4AXc3W01mMKUz>
	<E68B1FD97DB24312A9949339294556B1@Mick>	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<20150113185051.GC28785@gjcp.net>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C155@wdscexmb06.sc.wdc.com>
	<54B58489.4090702@musictechnologiesgroup.com>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C213@wdscexmb06.sc.wdc.com>

Nope - a K6T4016V3B-TB70. 
http://pdf.datasheetcatalog.com/datasheet/SamsungElectronic/mXvvstq.pdf
Separate coin-cell backup battery.
TSOP44 package  - not nearly as small SMT as the stuff I normally deal with.
Schematic date is 2002 but I think the synth was made to 2010.
The chip selects are sent by a Lattice programmable logic chip  - ISP LSI 1016E-80LT
http://www.latticesemi.com/~/media/Documents/DataSheets/ispLSI/ispLSI1016DataSheet.PDF
I was soooo scared this may have been bad - but looks to be issuing the CS's.  It has 5V VDD, outputs around 4V.  Most other stuff is 3.3V.
Alesis had a problem with one brand SRAM and recommended replacing any seen - but my unit has the approved brand.
They are IS61LV25616-15T:
http://www.cs.columbia.edu/~sedwards/classes/2008/4840/ISSI-IS61LV25616-SRAM.pdf
Should I look for a faster part if I replace?

Barry




-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of MTG
Sent: Tuesday, January 13, 2015 12:48 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Andromeda A6 repair?

Hi Barry,


NV SRAM being what?  A DIP with a battery built in?  Do you have a part number for that?

I've seen SRAM of just about every flavour fail at one time or other, but if there are mis-matched logic families that might account for a lot of really hard-to-put-a-finger-on trouble.

I wonder if the CS with the resistor might be better served with a diode?  What year is this thing ... are we talking mostly SMD?

GB


On 1/13/2015 11:00 AM, Barry Klein wrote:
> No SPI, old school parallel busses.
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> gordonjcp at gjcp.net
> Sent: Tuesday, January 13, 2015 10:51 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Andromeda A6 repair?
>
> On Tue, Jan 13, 2015 at 06:40:40PM +0000, Barry Klein wrote:
>> I am a bit confused though about the memory management.
>> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
>> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?
>
> Yes, if they share a common SPI bus (or parts of it).
>
_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From fanwander at mnet-online.de  Tue Jan 13 22:47:37 2015
From: fanwander at mnet-online.de (Florian Anwander)
Date: Tue, 13 Jan 2015 22:47:37 +0100
Subject: [sdiy] TR-909 switch source
In-Reply-To: <F9D7BF11-0171-4A88-8791-2430AC882E25@videotron.ca>
References: <op.xsfdl8lt414kda@computer>
	<F9D7BF11-0171-4A88-8791-2430AC882E25@videotron.ca>
Message-ID: <54B59279.6060201@mnet-online.de>

On 13.01.15 22:01 , Videotron wrote:
> Technology Transplant.
Do they still exist?


From greg at gzifcak.net  Wed Jan 14 00:45:34 2015
From: greg at gzifcak.net (Greg Zifcak)
Date: Tue, 13 Jan 2015 15:45:34 -0800
Subject: [sdiy] TR-909 switch source
Message-ID: <op.xsfdl8lt414kda@computer>

Hello,
I'm in search of a source for some replacement switches for the step keys  
on a 909. Syntaur is no longer able to provide them.
Thanks for any leads,
Greg


From greg at gzifcak.net  Wed Jan 14 03:11:34 2015
From: greg at gzifcak.net (Greg Zifcak)
Date: Tue, 13 Jan 2015 18:11:34 -0800
Subject: [sdiy] TR-909 switch source
In-Reply-To: <op.xsfdl8lt414kda@computer>
References: <op.xsfdl8lt414kda@computer>
Message-ID: <op.xsfkdket414kda@computer>

Just ordered from perfectcircuitaudio.com, thanks to a tip from Rob Hukin.

On Tue, 13 Jan 2015 15:45:34 -0800, Greg Zifcak <greg at gzifcak.net> wrote:

> Hello,
> I'm in search of a source for some replacement switches for the step  
> keys on a 909. Syntaur is no longer able to provide them.
> Thanks for any leads,
> Greg


From tokalo at videotron.ca  Wed Jan 14 07:08:50 2015
From: tokalo at videotron.ca (Tony Kalomiris)
Date: Wed, 14 Jan 2015 01:08:50 -0500
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
Message-ID: <109A44F9-EAF2-46C8-B8FE-B1D07EFEE534@videotron.ca>

Did you check the obvious, flux, contaminated keyboard contacts, psu etc..
Can't tell from bad picture of pcb overlay, but does this model have a guard ring around the keyboard sample and hold?

Describe rate of droop.
 
On 2015-01-13, at 2:01 PM, Carlos Portela wrote:

> 
> 
> After 2 months I turn the sh09 on and the cv out/pitch drops when it
> is on VCA hold.

Is a key pinned down for this. Hold only keeps VCA 'on', you will get pitch droop if not refreshed.



> 
> Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
> TL072. the problem persist.

Did you substitute a polypropylene capacitor for C2?
Other substitutions seem unnecessary. Because you did them all it's hard to isolate trouble.

> 
> Again removed the 2x 2sk30A GR to test them. After re-solder them the
> pitch was stable.
> I found that's (maybe) because of the heat from the iron.
> 10 min later was drooping again.

How did you test the FET's? Curious.
> 
> Also checked the sample and hold from lfo section (last time I
> switched the sample n hold FET with the keyboard tracking FET) and
> there was a kind of portmento between the played notes...

Did you try Q12 in the Sample and Hold/Noise section? Read the Service Manual about selected part , leakage test.
> 
> Any ideas what might be causing this? Bad Fets?
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From modular at go2.pl  Wed Jan 14 08:52:42 2015
From: modular at go2.pl (Roman Sowa)
Date: Wed, 14 Jan 2015 08:52:42 +0100
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>	<548AD727.1060005@go2.pl>	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
Message-ID: <54B6204A.3080909@go2.pl>

I've got strong feeling it is bad flash chip. This would explain why it 
does not pass the splash screen at first. And when you say it fails on 
verifying write, it may be because it encounters the same bad byte/block 
that caused initial fail.
If the bootloader is in the same flash chip, and hopefully in good part 
of it (it works as you say), I think you could just copy the content of 
entire chip to brand new part, then replace, and then try to load new OS 
with bootloader.

Roman

W dniu 2015-01-13 o 19:40, Barry Klein pisze:
> An update and feeble cry for help on the Andromeda repair...
> I checked with a scope most of the I/O, supplies, and crystal oscillators - ok.
> I replaced the CPU of the main board with a new part.
> The unit now will sometimes be "willing" to go into the (press 7) bootloader page or (press 2) front panel test page.
> With a press 7 I can upload the latest OS - it loaded successfully the last time I tried (once).  It then says to hit "store" and it writes to flash.
> Here it hangs on Verify block 14.
> It will also hang on the test of the slow ram - NVRAM.
> I have ordered a replacement part from China...
> I am a bit confused though about the memory management.
> There is a Flash, NV SRAM, and two "high speed" SRAM chips.
> Would an issue with the NV SRAM chip be responsible for a hang on the write to flash?
> Anyone know if really there is a separate bootloader sysx file?  There is a discussion on a forum about this (which wasn't answered).
> I guess not to worry for me if I can manage to get a successful sysx file dump over.(?)  It is the then write to flash that chokes.
> Should I shotgun this and also replace the SRAM chips while I'm at it?
> I'm wondering why it is so flakey to get it to go into the various soft button test modes - takes many tries and then it will do it for some time repetitively on demand.
> Something not quite kosher is the flash chip select.  3.3V part with 4V /CS.  Has a series "current limiting" resistor.
> As a last resort I may "sprinkle" some ceramic caps near VDD pins.  They used a lot of .01uF's and maybe .1's would be better.
>
> Barry
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From modular at go2.pl  Wed Jan 14 08:57:07 2015
From: modular at go2.pl (Roman Sowa)
Date: Wed, 14 Jan 2015 08:57:07 +0100
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
Message-ID: <54B62153.40808@go2.pl>

Just an idea: clean the board in area of FET-CAP-OPAMP
Soldering might have evaporated all water from the flux/dust/chewinggum 
that is there, and later air humidity helped the dust conducting.

Roman

W dniu 2015-01-13 o 20:01, Carlos Portela pisze:
> Hi all,
>
> After 2 months I turn the sh09 on and the cv out/pitch drops when it
> is on VCA hold.
>
> Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
> TL072. the problem persist.
>
> Again removed the 2x 2sk30A GR to test them. After re-solder them the
> pitch was stable.
> I found that's (maybe) because of the heat from the iron.
> 10 min later was drooping again.
>
> Also checked the sample and hold from lfo section (last time I
> switched the sample n hold FET with the keyboard tracking FET) and
> there was a kind of portmento between the played notes...
>
> Any ideas what might be causing this? Bad Fets?
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From carlosrochaportela at gmail.com  Wed Jan 14 11:04:56 2015
From: carlosrochaportela at gmail.com (Carlos Portela)
Date: Wed, 14 Jan 2015 11:04:56 +0100
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <54B62153.40808@go2.pl>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
	<54B62153.40808@go2.pl>
Message-ID: <CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>

The psu was checked, no leakage on the keyboard contact. Dont know
what you mean with flux
It has no guard ring on the pcb around LF13741, but datasheet talks
about that. It has a cardboard with metal foil connected to ground
above this area.
The hold is not holding (a semitone down every 15 sec). When the key
is pressed no pitch drop, only when it is on VCA HOLD
I didnt replaced all components components at same time, otherwise I
could not track the problem.
I had the opportunity to clean the the board area, all contacts in the
area were re-soldered.



2015-01-14 8:57 GMT+01:00 Roman Sowa <modular at go2.pl>:
> Just an idea: clean the board in area of FET-CAP-OPAMP
> Soldering might have evaporated all water from the flux/dust/chewinggum that
> is there, and later air humidity helped the dust conducting.
>
> Roman
>
> W dniu 2015-01-13 o 20:01, Carlos Portela pisze:
>>
>> Hi all,
>>
>> After 2 months I turn the sh09 on and the cv out/pitch drops when it
>> is on VCA hold.
>>
>> Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
>> TL072. the problem persist.
>>
>> Again removed the 2x 2sk30A GR to test them. After re-solder them the
>> pitch was stable.
>> I found that's (maybe) because of the heat from the iron.
>> 10 min later was drooping again.
>>
>> Also checked the sample and hold from lfo section (last time I
>> switched the sample n hold FET with the keyboard tracking FET) and
>> there was a kind of portmento between the played notes...
>>
>> Any ideas what might be causing this? Bad Fets?
>> _______________________________________________
>> 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 modular at go2.pl  Wed Jan 14 11:16:52 2015
From: modular at go2.pl (Roman Sowa)
Date: Wed, 14 Jan 2015 11:16:52 +0100
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>	<54B62153.40808@go2.pl>
	<CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>
Message-ID: <54B64214.108@go2.pl>

By flux I mean this (usually) brown stuff that makes soldering easier, 
and stays on the board around solder. It collects humidity and may 
become leaking electrically over long period of time.

Have you checked the gate voltage of the FET when no key is pressed? It 
should be close to negative supply.

One semitone per 15s not that bad, although my old synths do not drop 
that fast either I think. You may try also the dirty fix without finding 
real cause, just make the holding cap considerably bigger, like 4 times 
or so. Slight glide may appear as side effect, but drop rate should be 
acceptable then, so it will not be noticeable even at long release times.

Roman

W dniu 2015-01-14 o 11:04, Carlos Portela pisze:
> The psu was checked, no leakage on the keyboard contact. Dont know
> what you mean with flux
> It has no guard ring on the pcb around LF13741, but datasheet talks
> about that. It has a cardboard with metal foil connected to ground
> above this area.
> The hold is not holding (a semitone down every 15 sec). When the key
> is pressed no pitch drop, only when it is on VCA HOLD
> I didnt replaced all components components at same time, otherwise I
> could not track the problem.
> I had the opportunity to clean the the board area, all contacts in the
> area were re-soldered.
>
>
>
> 2015-01-14 8:57 GMT+01:00 Roman Sowa <modular at go2.pl>:
>> Just an idea: clean the board in area of FET-CAP-OPAMP
>> Soldering might have evaporated all water from the flux/dust/chewinggum that
>> is there, and later air humidity helped the dust conducting.
>>
>> Roman
>>
>> W dniu 2015-01-13 o 20:01, Carlos Portela pisze:
>>>
>>> Hi all,
>>>
>>> After 2 months I turn the sh09 on and the cv out/pitch drops when it
>>> is on VCA hold.
>>>
>>> Replaced IC2 lf13741 by CA3140, the fat capacitor, and IC1 4558 with
>>> TL072. the problem persist.
>>>
>>> Again removed the 2x 2sk30A GR to test them. After re-solder them the
>>> pitch was stable.
>>> I found that's (maybe) because of the heat from the iron.
>>> 10 min later was drooping again.
>>>
>>> Also checked the sample and hold from lfo section (last time I
>>> switched the sample n hold FET with the keyboard tracking FET) and
>>> there was a kind of portmento between the played notes...
>>>
>>> Any ideas what might be causing this? Bad Fets?
>>> _______________________________________________
>>> 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 rburnett at richieburnett.co.uk  Wed Jan 14 14:07:04 2015
From: rburnett at richieburnett.co.uk (rburnett at richieburnett.co.uk)
Date: Wed, 14 Jan 2015 13:07:04 +0000
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
	<54B62153.40808@go2.pl>
	<CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>
Message-ID: <3ff2c216801d0afe3a940df4949f7ba9@richieburnett.co.uk>

> It has no guard ring on the pcb around LF13741, but datasheet talks
> about that. It has a cardboard with metal foil connected to ground
> above this area.

Maybe the foil-backed cardboard screening sheet has absorbed moisture 
and become slightly conductive.  You could try putting some polythene 
sheet between the cardboard and the sensitive sample-and-hold area of 
the PCB.  Or temporarily removing the foil/cardboard sheet, and see if 
the leakage problem goes away.  (As far as I know this screening sheet 
in the SH-09 is to stop 50/60Hz electric fields from the mains wiring 
underneath from introducing pitch warble into the expo-converter on the 
PCB.)

I guess that ideally the PCB would have a guard ring and be coated with 
conformal coating to keep leakage currents in the S&H under control in 
high humidity environments.

-Richie,


From Rob at gmsn.co.uk  Wed Jan 14 16:57:02 2015
From: Rob at gmsn.co.uk (Rob Spencer)
Date: Wed, 14 Jan 2015 15:57:02 +0000
Subject: [sdiy] Bulk Tempcos UK
Message-ID: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>

Hi,

Can anyone advise where to get Tempcos in bulk in the UK?

I usually get all my bits through RS, but I can't seem to find them on there.

Cheers

Rob


From igg.debus at t-online.de  Wed Jan 14 18:22:40 2015
From: igg.debus at t-online.de (Ingo Debus)
Date: Wed, 14 Jan 2015 18:22:40 +0100
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
Message-ID: <75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>


Am 13.01.2015 um 19:40 schrieb Barry Klein:

> As a last resort I may "sprinkle" some ceramic caps near VDD pins.  They used a lot of .01uF's and maybe .1's would be better.

Recently I heard that in today's fast digital circuits 0.01 uF are better suited for supply decoupling than 0.1 uF caps. The resonant frequency of smaller caps is higher.

Ingo

From carlosrochaportela at gmail.com  Wed Jan 14 19:25:57 2015
From: carlosrochaportela at gmail.com (Carlos Portela)
Date: Wed, 14 Jan 2015 19:25:57 +0100
Subject: [sdiy] sh09 cv out drops again
In-Reply-To: <3ff2c216801d0afe3a940df4949f7ba9@richieburnett.co.uk>
References: <CANdqpLbdo+RsNk8FuHJuanyFSRGfGYH4MYMzOsHOpot9K6EDag@mail.gmail.com>
	<54B62153.40808@go2.pl>
	<CANdqpLakzXpSSV65yTzXqYp8Z=-r2KZxOFi92dLMeC4rS2J1dQ@mail.gmail.com>
	<3ff2c216801d0afe3a940df4949f7ba9@richieburnett.co.uk>
Message-ID: <CANdqpLbbcS8VSW6KAKcgd6tWjknPab7imvhRLo-gC+ZEOLrx7A@mail.gmail.com>

Couldnt find any problem.

Just changed Q2 by 2n5457. It holds a lot better. maybe 3/4 min per semitone
I test the JFET but was working.
Any idea why's that?

2015-01-14 14:07 GMT+01:00  <rburnett at richieburnett.co.uk>:
>> It has no guard ring on the pcb around LF13741, but datasheet talks
>> about that. It has a cardboard with metal foil connected to ground
>> above this area.
>
>
> Maybe the foil-backed cardboard screening sheet has absorbed moisture and
> become slightly conductive.  You could try putting some polythene sheet
> between the cardboard and the sensitive sample-and-hold area of the PCB.  Or
> temporarily removing the foil/cardboard sheet, and see if the leakage
> problem goes away.  (As far as I know this screening sheet in the SH-09 is
> to stop 50/60Hz electric fields from the mains wiring underneath from
> introducing pitch warble into the expo-converter on the PCB.)
>
> I guess that ideally the PCB would have a guard ring and be coated with
> conformal coating to keep leakage currents in the S&H under control in high
> humidity environments.
>
> -Richie,


From xyzzy at sysabend.org  Wed Jan 14 20:05:28 2015
From: xyzzy at sysabend.org (Tom Arnold)
Date: Wed, 14 Jan 2015 11:05:28 -0800
Subject: [sdiy] 4x4 Button Pads bulk order
Message-ID: <20150114190528.GE2646@moo.sysabend.org>

Greetings!
Been a while since I posted.  Been busy moving and trying to get my garage
reconstructed.  If anyone is in the Hampton Roads area of Virginia I'd love
to meet up.  Area feels like a tech ghosttown after California.

Anyhow, looking into doing a bulk purchase of 4x4 silicone keypads from the
manufacturer in China.  This is just the rubber w/contact part.  No
PCBboard.  I need around 20 of them.  Jim Patchell wants some too, so
figured I'd see if anyone else is interested.

These are basically the ones that SparkFun sells, not the ones that AdaFruit
sells.  These will fit a 5mm through-hole LED.

I have pictures and information here: http://sdiy.org/xyzzy/buttonpad/

They are heavy so shipping outside the US is probably expensive but I can
eyeball a price if someone is really interested, otherwise we're
looking at a cost of approx $3ea plus shipping and in the US I'll use flat
rate boxes so shipping shouldn't be any higher then $15 for a whole bunch of
them.

This is a standard "I'm not making any money on this" bulk order.  Its an I 
can buy 20 from Sparkfun, or 100 direct from the manufacturer for near the 
same price sorta thing...

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -  "...is it a virus, a drug, or a religion?"
 - K6AET            -  Juanita Shrugs. "What's the difference? 
 --------------------         -- Neal Stephenson,  Snow Crash


From Barry.L.Klein at wdc.com  Wed Jan 14 20:14:47 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Wed, 14 Jan 2015 19:14:47 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>


>Recently I heard that in today's fast digital circuits 0.01 uF are better suited for supply decoupling than 0.1 uF caps. The resonant frequency of smaller caps is higher.

Yeah I read some papers from companies like HP that even suggested 3 values in parallel.
The thing about this synth design is that there really is not much bulk capacitance.
The supplies are linear regulators like the LM317.  
Here in our products I think we use a lot of .1uF's.  Also larger like 1uF, 2.2uf, and 10uF for chips with higher current VDD requirements.
A board as big as this A6 main board seems kinda light with just local .01uf's and the caps in the regulator circuit 8 inches away.
The way this synth has such an irregular boot behavior it is something analog causing it.  I'm thinking the caps could help.
There seems to be a good reset hold off on initial power (dedicated reset chip).
Could be irregular xtal behavior too I suppose.

Barry




From grant at musictechnologiesgroup.com  Wed Jan 14 20:38:05 2015
From: grant at musictechnologiesgroup.com (MTG)
Date: Wed, 14 Jan 2015 11:38:05 -0800
Subject: [sdiy] 4x4 Button Pads bulk order
In-Reply-To: <20150114190528.GE2646@moo.sysabend.org>
References: <20150114190528.GE2646@moo.sysabend.org>
Message-ID: <54B6C59D.2040806@musictechnologiesgroup.com>

Hi,

So the plan is to make a PCB of your own that accepts these? Have you 
tried the PCB "extensively". Reason I ask is although these and the 
Sparkfun items interest me, I'm concerned about the longer term 
reliability of using them with a tinned solder contact. Shouldn't it be 
gold or something on the PCB end?  I'm just asking here as it's not my 
area of expertise. But I am, along with many of us, experienced with 
rubber contacts not working after a period of time.  Are Livid and 
Tenori, etc. doing it a certain way to enhance reliability?

GB

On 1/14/2015 11:05 AM, Tom Arnold wrote:
> Greetings!
> Been a while since I posted.  Been busy moving and trying to get my garage
> reconstructed.  If anyone is in the Hampton Roads area of Virginia I'd love
> to meet up.  Area feels like a tech ghosttown after California.
>
> Anyhow, looking into doing a bulk purchase of 4x4 silicone keypads from the
> manufacturer in China.  This is just the rubber w/contact part.  No
> PCBboard.  I need around 20 of them.  Jim Patchell wants some too, so
> figured I'd see if anyone else is interested.
>
> These are basically the ones that SparkFun sells, not the ones that AdaFruit
> sells.  These will fit a 5mm through-hole LED.
>
> I have pictures and information here: http://sdiy.org/xyzzy/buttonpad/
>
> They are heavy so shipping outside the US is probably expensive but I can
> eyeball a price if someone is really interested, otherwise we're
> looking at a cost of approx $3ea plus shipping and in the US I'll use flat
> rate boxes so shipping shouldn't be any higher then $15 for a whole bunch of
> them.
>
> This is a standard "I'm not making any money on this" bulk order.  Its an I
> can buy 20 from Sparkfun, or 100 direct from the manufacturer for near the
> same price sorta thing...
>


From xyzzy at sysabend.org  Thu Jan 15 01:01:48 2015
From: xyzzy at sysabend.org (Tom Arnold)
Date: Wed, 14 Jan 2015 16:01:48 -0800
Subject: [sdiy] 4x4 Button Pads bulk order
In-Reply-To: <54B6C59D.2040806@musictechnologiesgroup.com>
References: <20150114190528.GE2646@moo.sysabend.org>
	<54B6C59D.2040806@musictechnologiesgroup.com>
Message-ID: <20150115000148.GF2646@moo.sysabend.org>

On Wed, Jan 14, 2015 at 11:38:05AM -0800, MTG wrote:
> Hi,
> 
> So the plan is to make a PCB of your own that accepts these? Have you 
> tried the PCB "extensively". Reason I ask is although these and the 
> Sparkfun items interest me, I'm concerned about the longer term 
> reliability of using them with a tinned solder contact. Shouldn't it be 
> gold or something on the PCB end?  I'm just asking here as it's not my 
> area of expertise. But I am, along with many of us, experienced with 
> rubber contacts not working after a period of time.  Are Livid and 
> Tenori, etc. doing it a certain way to enhance reliability?

I'll be doing a layout for my own project at some point.  Most likely I'll
just get the whole board done ENIG and see how that holds up.   Thats
usually a thin "soft" gold plating and a "hard" gold plating like is
traditional for card edge connectors would be much better.  Just have to see
how it does. 

I wouldn't do these in Tin if only because HASL tends to be a little lumpy (
look at it under a scope ).  ENIG is typically as flat as the copper
underneath.

One thing about "old" rubber contacts, they were the carbon pill type.
Quite scary how long I've actually fought with those in devices doing
repair.  The general consensus from Matsushita about 25 years ago was that
most of the problem was caused by the pill itself releasing mold release
compound over time.  In theory the more modern silicone+conductive printing
*should* last much longer.

I took apart many a cordless phone to clean that problem back when people
actually got devices repaired...

-- 
 -----------------------------------------------------------------
 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
 - SynthGeek        -  "...is it a virus, a drug, or a religion?"
 - K6AET            -  Juanita Shrugs. "What's the difference? 
 --------------------         -- Neal Stephenson,  Snow Crash


From mec.forumreader at gmail.com  Thu Jan 15 01:02:41 2015
From: mec.forumreader at gmail.com (Michael E Caloroso)
Date: Wed, 14 Jan 2015 19:02:41 -0500
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl>
	<20141209102214.GD23764@aym.net2.nerim.net>
	<E68B1FD97DB24312A9949339294556B1@Mick> <548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
Message-ID: <CAAv6=UAzEfxXxjrH5GvSD3RTXf+AeqCG1eygqz4kMZR5-AJY7A@mail.gmail.com>

Not just mix of values but also mix of dielectrics.  Ceramic (small
values) with tantalum (large values) are two recommended mixes.

MC

On 1/14/15, Barry Klein <Barry.L.Klein at wdc.com> wrote:
>
>>Recently I heard that in today's fast digital circuits 0.01 uF are better
>> suited for supply decoupling than 0.1 uF caps. The resonant frequency of
>> smaller caps is higher.
>
> Yeah I read some papers from companies like HP that even suggested 3 values
> in parallel.
> The thing about this synth design is that there really is not much bulk
> capacitance.
> The supplies are linear regulators like the LM317.
> Here in our products I think we use a lot of .1uF's.  Also larger like 1uF,
> 2.2uf, and 10uF for chips with higher current VDD requirements.
> A board as big as this A6 main board seems kinda light with just local
> .01uf's and the caps in the regulator circuit 8 inches away.
> The way this synth has such an irregular boot behavior it is something
> analog causing it.  I'm thinking the caps could help.
> There seems to be a good reset hold off on initial power (dedicated reset
> chip).
> Could be irregular xtal behavior too I suppose.
>
> Barry
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>


From quincas at gmail.com  Thu Jan 15 17:15:41 2015
From: quincas at gmail.com (Quincas)
Date: Thu, 15 Jan 2015 10:15:41 -0600
Subject: [sdiy] Bulk Tempcos UK
In-Reply-To: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
References: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
Message-ID: <311D54F3-D2DB-4858-9347-D969665F29FC@gmail.com>

Thonk has tempcos at a good price, maybe Steven can help you?

Sent from my iPad

> On 14/01/2015, at 9:57, Rob Spencer <Rob at gmsn.co.uk> wrote:
> 
> Hi,
> 
> Can anyone advise where to get Tempcos in bulk in the UK?
> 
> I usually get all my bits through RS, but I can't seem to find them on there.
> 
> Cheers
> 
> Rob
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From aym-htnys at teaser.fr  Thu Jan 15 18:23:31 2015
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Thu, 15 Jan 2015 18:23:31 +0100
Subject: [sdiy] Bulk Tempcos UK
In-Reply-To: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
References: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
Message-ID: <20150115172331.GA12247@aym.net2.nerim.net>

On 2015-01-14 15:57 +0000, Rob Spencer wrote:

> Can anyone advise where to get Tempcos in bulk in the UK?
> 
> I usually get all my bits through RS, but I can't seem to find
> them on there.

Takuya Katayama ships to the UK, I believe. There is an annoying
Excel form to fill ('cause everyone has Microsoft Office, right ?)
but he has the lowest prices on through-hole +3300 PPM/K tempcos
that I know of.

http://www.mmslab.jp/parts.html

-- 
Andr? Majorel http://www.teaser.fr/~amajorel/


From Rob at gmsn.co.uk  Thu Jan 15 18:41:37 2015
From: Rob at gmsn.co.uk (Rob Spencer)
Date: Thu, 15 Jan 2015 17:41:37 +0000
Subject: [sdiy] Bulk Tempcos UK
In-Reply-To: <20150115172331.GA12247@aym.net2.nerim.net>
References: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
	<20150115172331.GA12247@aym.net2.nerim.net>
Message-ID: <BB9370EB-7C92-46C8-BB5C-6B469F4FB783@gmsn.co.uk>

Cool, thanks guys. I'll check Stephen out as I need some fairly urgently.

The Japanese guy looks good for some other bits aswell. I'm guessing there's no issues with quality?

Cheers

Rob

> On 15 Jan 2015, at 17:23, Andre Majorel <aym-htnys at teaser.fr> wrote:
> 
>> On 2015-01-14 15:57 +0000, Rob Spencer wrote:
>> 
>> Can anyone advise where to get Tempcos in bulk in the UK?
>> 
>> I usually get all my bits through RS, but I can't seem to find
>> them on there.
> 
> Takuya Katayama ships to the UK, I believe. There is an annoying
> Excel form to fill ('cause everyone has Microsoft Office, right ?)
> but he has the lowest prices on through-hole +3300 PPM/K tempcos
> that I know of.
> 
> http://www.mmslab.jp/parts.html
> 
> -- 
> Andr? Majorel http://www.teaser.fr/~amajorel/
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From eidorian at aladan.net  Thu Jan 15 22:14:22 2015
From: eidorian at aladan.net (eidorian at aladan.net)
Date: Thu, 15 Jan 2015 13:14:22 -0800
Subject: [sdiy] Bulk Tempcos UK
In-Reply-To: <BB9370EB-7C92-46C8-BB5C-6B469F4FB783@gmsn.co.uk>
References: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
	<20150115172331.GA12247@aym.net2.nerim.net>
	<BB9370EB-7C92-46C8-BB5C-6B469F4FB783@gmsn.co.uk>
Message-ID: <2ec762faa8fd11f96be49c18018e0637@aladan.net>

Taku/Pata ("that Japanese guy") is very highly recommended and my 
personal experiences buying tempcos and other parts from him have been 
excellent with no issues whatsoever.  He is on this list (but may not 
read every thread in detail.)

Cheers,
A.


On 2015-01-15 09:41, Rob Spencer wrote:
> Cool, thanks guys. I'll check Stephen out as I need some fairly 
> urgently.
>
> The Japanese guy looks good for some other bits aswell. I'm guessing
> there's no issues with quality?
>
> Cheers
>
> Rob
>
>> On 15 Jan 2015, at 17:23, Andre Majorel <aym-htnys at teaser.fr> wrote:
>>
>>> On 2015-01-14 15:57 +0000, Rob Spencer wrote:
>>>
>>> Can anyone advise where to get Tempcos in bulk in the UK?
>>>
>>> I usually get all my bits through RS, but I can't seem to find
>>> them on there.
>>
>> Takuya Katayama ships to the UK, I believe. There is an annoying
>> Excel form to fill ('cause everyone has Microsoft Office, right ?)
>> but he has the lowest prices on through-hole +3300 PPM/K tempcos
>> that I know of.
>>
>> http://www.mmslab.jp/parts.html
>>
>> --
>> Andr? Majorel http://www.teaser.fr/~amajorel/
>> _______________________________________________
>> 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 pata at ieee.org  Thu Jan 15 22:38:28 2015
From: pata at ieee.org (pata at ieee.org)
Date: Fri, 16 Jan 2015 06:38:28 +0900
Subject: [sdiy] Bulk Tempcos UK
In-Reply-To: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
References: <CB1BD98B-5B49-434B-A91C-8767224C2EA7@gmsn.co.uk>
Message-ID: <54B83354.7050406@ieee.org>

Hi Rob and the List,

Can I help you?

p.s.
Thank you very much for recommending me, A*2 ;-)

=========================================
Takuya "Taku" Katayama
Muse Music Synthesizer Laboratory, Japan
http://www.mmslab.jp/


On 2015/01/15 0:57, Rob Spencer wrote:
> Hi,
>
> Can anyone advise where to get Tempcos in bulk in the UK?
>
> I usually get all my bits through RS, but I can't seem to find them on there.
>
> Cheers
>
> Rob
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From Barry.L.Klein at wdc.com  Fri Jan 16 02:46:40 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Fri, 16 Jan 2015 01:46:40 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0CACC@wdscexmb06.sc.wdc.com>

So this looks like a fun debug/upgrade tool for this - just not cost effective:
http://www.pemicro.com/products/product_viewDetails.cfm?product_id=145

Barry



From Barry.L.Klein at wdc.com  Fri Jan 16 03:14:09 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Fri, 16 Jan 2015 02:14:09 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0CACC@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0CACC@wdscexmb06.sc.wdc.com>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0CAF6@wdscexmb06.sc.wdc.com>

Just looking on ebay I saw and bought this:
http://www.ebay.com/itm/P-E-USB-MultiLink-Debugger-/301462293004?

Anyone use one before?  

Barry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Barry Klein
Sent: Thursday, January 15, 2015 5:47 PM
To: SDIY Mailing Group
Subject: Re: [sdiy] Andromeda A6 repair?

So this looks like a fun debug/upgrade tool for this - just not cost effective:
http://www.pemicro.com/products/product_viewDetails.cfm?product_id=145

Barry

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


From Barry.L.Klein at wdc.com  Fri Jan 16 03:25:08 2015
From: Barry.L.Klein at wdc.com (Barry Klein)
Date: Fri, 16 Jan 2015 02:25:08 +0000
Subject: [sdiy] Andromeda A6 repair?
In-Reply-To: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0CAF6@wdscexmb06.sc.wdc.com>
References: <54860C7B.6050006@artefacts.nl><20141209102214.GD23764@aym.net2.nerim.net>
	<RmMF1p01J4AXc3W01mMKUz>	<E68B1FD97DB24312A9949339294556B1@Mick>
	<548AD727.1060005@go2.pl>
	<83EEDB9AA00D6B449EB022CF4EFEC32301149F10CF@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C139@wdscexmb06.sc.wdc.com>
	<75515AA6-69AB-427B-8DD9-5F9B009442D6@t-online.de>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0C526@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0CACC@wdscexmb06.sc.wdc.com>
	<83EEDB9AA00D6B449EB022CF4EFEC3230114A0CAF6@wdscexmb06.sc.wdc.com>
Message-ID: <83EEDB9AA00D6B449EB022CF4EFEC3230114A0CB0F@wdscexmb06.sc.wdc.com>

Aarghh, wrong chip supported.   The right one sells for ~$400.

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Barry Klein
Sent: Thursday, January 15, 2015 6:14 PM
To: SDIY Mailing Group
Subject: Re: [sdiy] Andromeda A6 repair?

Just looking on ebay I saw and bought this:
http://www.ebay.com/itm/P-E-USB-MultiLink-Debugger-/301462293004?

Anyone use one before?  

Barry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Barry Klein
Sent: Thursday, January 15, 2015 5:47 PM
To: SDIY Mailing Group
Subject: Re: [sdiy] Andromeda A6 repair?

So this looks like a fun debug/upgrade tool for this - just not cost effective:
http://www.pemicro.com/products/product_viewDetails.cfm?product_id=145

Barry

_______________________________________________
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 aeakin1 at matrixblues.com  Tue Jan 20 00:47:22 2015
From: aeakin1 at matrixblues.com (Andy Eakin)
Date: Mon, 19 Jan 2015 18:47:22 -0500
Subject: [sdiy] MCT2 Optocoupler questions
Message-ID: <54BD978A.3010504@matrixblues.com>

I posted this over at Muff's but with the recent board issues, 
visibility is a bit low.

Long story short, I am in possession of about 80 of these little 
buggers.  While I have not worked with optocouplers before, I have 
always understood them as an on/off switch for isolating (thinking MIDI 
interface or high voltage switching).  Looking through the datasheet

http://www.ti.com/lit/ds/symlink/mct2.pdf

I found some things that have arouse my curiosity:

"Base Lead Provided for Conventional Transistor Biasing"
and
Page 4 Figure 2 "COLLECTOR CURRENT vs INPUT-DIODE FORWARD CURRENT"


This leads me to believe that I could drop one in place of any similar 
NPN BJT and use the LED as a current controlled fun bit.  Is my thinking 
right?

I would love to experiment but my bench is still packed in boxes from a 
recent move.

Andy


From indigoid at oldcorollas.org  Tue Jan 20 05:38:44 2015
From: indigoid at oldcorollas.org (john slee)
Date: Tue, 20 Jan 2015 15:38:44 +1100
Subject: [sdiy] MCT2 Optocoupler questions
In-Reply-To: <54BD978A.3010504@matrixblues.com>
References: <54BD978A.3010504@matrixblues.com>
Message-ID: <CAK+JDy2tiwJzqSh+Uqo6NqcpHQQnX4OnjX2amJh67gSR002vMQ@mail.gmail.com>

You might look at AndrewF's DP filter!

http://nonlinearcircuits.blogspot.com.au/2014/01/double-penetration-filter.html

I have one of these at the top of my PCB backlog pile. Just need to
order the SMD bits

John

On 20 January 2015 at 10:47, Andy Eakin <aeakin1 at matrixblues.com> wrote:
> I posted this over at Muff's but with the recent board issues, visibility is
> a bit low.
>
> Long story short, I am in possession of about 80 of these little buggers.
> While I have not worked with optocouplers before, I have always understood
> them as an on/off switch for isolating (thinking MIDI interface or high
> voltage switching).  Looking through the datasheet
>
> http://www.ti.com/lit/ds/symlink/mct2.pdf
>
> I found some things that have arouse my curiosity:
>
> "Base Lead Provided for Conventional Transistor Biasing"
> and
> Page 4 Figure 2 "COLLECTOR CURRENT vs INPUT-DIODE FORWARD CURRENT"
>
>
> This leads me to believe that I could drop one in place of any similar NPN
> BJT and use the LED as a current controlled fun bit.  Is my thinking right?
>
> I would love to experiment but my bench is still packed in boxes from a
> recent move.
>
> Andy
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From neil.johnson71 at gmail.com  Wed Jan 21 09:34:51 2015
From: neil.johnson71 at gmail.com (Neil Johnson)
Date: Wed, 21 Jan 2015 08:34:51 +0000
Subject: [sdiy] Synth DIY UK 2015
Message-ID: <CACZGMxJhBUOxO_NrBuMnJM9e1gF5Q=p=djcSt5ekB5C7_xZsng@mail.gmail.com>

Hi all,

This year's Synth DIY UK Cambridge meeting is on the weekend of July 17th-19th.
Same venue - Robinson College, Cambridge.

Info will be going up on the main site as soon as Paul gets back and
recovers from NAMM.  You can now access it through a dedicated URL:
   http://www.synth-diy.uk

Room bookings are now also open:
   http://www.njohnson.co.uk/SDIY/roombooking.html

Cheers,
Neil
--
http://www.njohnson.co.uk


From aym-htnys at teaser.fr  Wed Jan 21 14:02:59 2015
From: aym-htnys at teaser.fr (Andre Majorel)
Date: Wed, 21 Jan 2015 14:02:59 +0100
Subject: [sdiy] DIP NE5517 being obsoleted
Message-ID: <20150121130259.GC12247@aym.net2.nerim.net>

The last source of through-hole NE5517 I know of is drying up.
Or at least being transferred to Rochester Electronics.

  http://www.onsemi.com/PowerSolutions/product.do?id=NE5517

If I'm not mistaken, the LM13700 is a substitute.

-- 
Andr? Majorel http://www.teaser.fr/~amajorel/


From dixon at mail.ubc.ca  Wed Jan 21 20:05:28 2015
From: dixon at mail.ubc.ca (David G Dixon)
Date: Wed, 21 Jan 2015 11:05:28 -0800
Subject: [sdiy] DIP NE5517 being obsoleted
In-Reply-To: <20150121130259.GC12247@aym.net2.nerim.net>
References: <20150121130259.GC12247@aym.net2.nerim.net>
Message-ID: <1B1C4A4C90624869B1AF4F5FB7A4762B@galvanox01>

I haven't used an OTA in years, so no worries for me. 

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl 
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> Andre Majorel
> Sent: Wednesday, January 21, 2015 5:03 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] DIP NE5517 being obsoleted
> 
> The last source of through-hole NE5517 I know of is drying up.
> Or at least being transferred to Rochester Electronics.
> 
>   http://www.onsemi.com/PowerSolutions/product.do?id=NE5517
> 
> If I'm not mistaken, the LM13700 is a substitute.
> 
> --
> Andr? Majorel http://www.teaser.fr/~amajorel/ 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From edwardschultheis at me.com  Wed Jan 21 23:23:39 2015
From: edwardschultheis at me.com (Edward Schultheis)
Date: Wed, 21 Jan 2015 14:23:39 -0800
Subject: [sdiy] 34 pin ribbon cable for kurzweil k1200 professional
Message-ID: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>

 Hi all, I am repairing a K1200 and believe there is a short In the ribbon cable connecting to the keyboard.
 I am having trouble finding it. I found one that matches the headers at frys for old floppy drive, but it wasn't long enough.
 I don't know exactly what to search for.
 Anyone have any ideas?

Thanks!

Edward Schultheis

Edwardschultheis at me.com




From lists at meccanion.com  Wed Jan 21 23:54:17 2015
From: lists at meccanion.com (Colin Hinz)
Date: Wed, 21 Jan 2015 17:54:17 -0500 (Eastern Standard Time)
Subject: [sdiy] 34 pin ribbon cable for kurzweil k1200 professional
In-Reply-To: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>
References: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>
Message-ID: <alpine.WNT.2.11.1501211753070.5720@jupiter>

On Wed, 21 Jan 2015, Edward Schultheis wrote:

> Hi all, I am repairing a K1200 and believe there is a short In the ribbon cable connecting to the keyboard.
> I am having trouble finding it. I found one that matches the headers at frys for old floppy drive, but it wasn't long enough.
> I don't know exactly what to search for.
> Anyone have any ideas?
>
> Thanks!
>
> Edward Schultheis
>
> Edwardschultheis at me.com

Like this?

(they come prefabricated in various lengths)

http://www.digikey.ca/product-detail/en/H3CCS-3406G/H3CCS-3406G-ND/1218593

- Colin


---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com



From edwardschultheis at me.com  Thu Jan 22 01:09:24 2015
From: edwardschultheis at me.com (Edward Schultheis)
Date: Wed, 21 Jan 2015 16:09:24 -0800
Subject: [sdiy] 34 pin ribbon cable for kurzweil k1200 professional
In-Reply-To: <alpine.WNT.2.11.1501211753070.5720@jupiter>
References: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>
	<alpine.WNT.2.11.1501211753070.5720@jupiter>
Message-ID: <F59F04C5-A212-49AE-BD99-C34FFC8D94E3@me.com>

Exactly, thank you!!

Edward Schultheis
(718)666-0070
Edwardschultheis at me.com



> On Jan 21, 2015, at 2:54 PM, Colin Hinz <lists at meccanion.com> wrote:
> 
>> On Wed, 21 Jan 2015, Edward Schultheis wrote:
>> 
>> Hi all, I am repairing a K1200 and believe there is a short In the ribbon cable connecting to the keyboard.
>> I am having trouble finding it. I found one that matches the headers at frys for old floppy drive, but it wasn't long enough.
>> I don't know exactly what to search for.
>> Anyone have any ideas?
>> 
>> Thanks!
>> 
>> Edward Schultheis
>> 
>> Edwardschultheis at me.com
> 
> Like this?
> 
> (they come prefabricated in various lengths)
> 
> http://www.digikey.ca/product-detail/en/H3CCS-3406G/H3CCS-3406G-ND/1218593
> 
> - Colin
> 
> 
> ---
> This email is free from viruses and malware because avast! Antivirus protection is active.
> http://www.avast.com
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From grant at musictechnologiesgroup.com  Thu Jan 22 02:44:26 2015
From: grant at musictechnologiesgroup.com (MTG)
Date: Wed, 21 Jan 2015 17:44:26 -0800
Subject: [sdiy] Simple soldering kit, music/noise/midi related?
In-Reply-To: <F59F04C5-A212-49AE-BD99-C34FFC8D94E3@me.com>
References: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>	<alpine.WNT.2.11.1501211753070.5720@jupiter>
	<F59F04C5-A212-49AE-BD99-C34FFC8D94E3@me.com>
Message-ID: <54C055FA.2060202@musictechnologiesgroup.com>

I was thinking of teaching basic soldering skills to the kids next door. 
Can anyone thing of a simple/cheap sound-making kit we could build? I 
remember as a kid doing a little organ from radio shack. What would be 
even better would be something that had MIDI in or out so they could 
hook it up to their Yamaha home piano and really annoy the parents.

GB


From obl64 at ix.netcom.com  Thu Jan 22 03:10:52 2015
From: obl64 at ix.netcom.com (Oren Leavitt)
Date: Wed, 21 Jan 2015 20:10:52 -0600
Subject: [sdiy] Simple soldering kit, music/noise/midi related?
In-Reply-To: <54C055FA.2060202@musictechnologiesgroup.com>
References: <205CC92A-F759-4BC9-95F3-E2A2D467EB83@me.com>	<alpine.WNT.2.11.1501211753070.5720@jupiter>	<F59F04C5-A212-49AE-BD99-C34FFC8D94E3@me.com>
	<54C055FA.2060202@musictechnologiesgroup.com>
Message-ID: <54C05C2C.5040404@ix.netcom.com>



On 1/21/2015 7:44 PM, MTG wrote:
> I was thinking of teaching basic soldering skills to the kids next door.
> Can anyone thing of a simple/cheap sound-making kit we could build? I
> remember as a kid doing a little organ from radio shack. What would be
> even better would be something that had MIDI in or out so they could
> hook it up to their Yamaha home piano and really annoy the parents.
>
> GB

There are a couple of those Radio Shack organs on eBay right now if 
you'd like get them the actual thing you started with.
Search "science fair organ kit"

Maybe a MFOS Weird Sound Generator?
http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&VPW=1643&VPH=751


- Oren


From admin at bugbrand.co.uk  Thu Jan 22 09:46:51 2015
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Thu, 22 Jan 2015 08:46:51 +0000
Subject: [sdiy] Magic Smoke / Tim Servo
Message-ID: <54C0B8FB.3040104@bugbrand.co.uk>

Call out for Tim of Magic Smoke.

This sort of thread / complaint comes up quite regularly: 
http://www.muffwiggler.com/forum/viewtopic.php?t=73601

Perhaps some form of change is needed where either people are warned 
that physical orders (rather than PDFs) may be slow or perhaps email is 
losing things (which would need to be addressed).
I don't think it is fair on people to keep orders open otherwise if they 
can't be fulfilled.

Best, Tom

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk



From aeakin1 at matrixblues.com  Thu Jan 22 16:15:15 2015
From: aeakin1 at matrixblues.com (Andy Eakin)
Date: Thu, 22 Jan 2015 10:15:15 -0500
Subject: [sdiy] MCT2 Optocoupler questions
In-Reply-To: <54BD978A.3010504@matrixblues.com>
References: <54BD978A.3010504@matrixblues.com>
Message-ID: <54C11403.8050206@matrixblues.com>

Thank you to whoever replied, I see it in the archives, but due to my 
DNS provider botching a notification from ICANN, my domain was down for 
about 48 hours.

Anyhow, that DP filter is awesome! In some of his example it almost has 
a formant effect.

Andy

On 1/19/2015 6:47 PM, Andy Eakin wrote:
> I posted this over at Muff's but with the recent board issues,
> visibility is a bit low.
>
> Long story short, I am in possession of about 80 of these little
> buggers.  While I have not worked with optocouplers before, I have
> always understood them as an on/off switch for isolating (thinking MIDI
> interface or high voltage switching).  Looking through the datasheet
>
> http://www.ti.com/lit/ds/symlink/mct2.pdf
>
> I found some things that have arouse my curiosity:
>
> "Base Lead Provided for Conventional Transistor Biasing"
> and
> Page 4 Figure 2 "COLLECTOR CURRENT vs INPUT-DIODE FORWARD CURRENT"
>
>
> This leads me to believe that I could drop one in place of any similar
> NPN BJT and use the LED as a current controlled fun bit.  Is my thinking
> right?
>
> I would love to experiment but my bench is still packed in boxes from a
> recent move.
>
> Andy


From barryklein at cox.net  Sat Jan 24 21:56:04 2015
From: barryklein at cox.net (Barry Klein)
Date: Sat, 24 Jan 2015 12:56:04 -0800
Subject: [sdiy] Andromeda A6 repair?
Message-ID: <E35A0F1CE9FB4F00B5CCF0ADD895E865@Mick>

Hi guys,
I have replaced the cpu and no change.
Replaced the "slow ram" (NVRAM) 70ns, no change.
Replaced the two "fast ram" 15ns chips and no I can't get it to go into 
diagnostic mode anymore.  Just the splash screen.
So I am wondering, should I try faster chips for the "Fast ram"?  They were 
having SRAM issues as it is mentioned in the service manual.
What I installed was the recommended brand/part.
Still waiting on the flash part from China.
The parts I removed I saved and can put back if need be.

Barry 



From jpdesroc at oricom.ca  Tue Jan 27 02:43:22 2015
From: jpdesroc at oricom.ca (Jean-Pierre Desrochers)
Date: Mon, 26 Jan 2015 20:43:22 -0500
Subject: [sdiy] Commodore SID 6581 chip for sale..
Message-ID: <e81d9c942d2550de4954c6f4fdfc4488@oricom.ca>


Hi everybody,

Just to let you know I'm selling this baby now:

http://www.ebay.ca/itm/251809397046?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

Sorry for interupting...

JP



From lanterma at ece.gatech.edu  Wed Jan 28 20:40:16 2015
From: lanterma at ece.gatech.edu (Lanterman, Aaron)
Date: Wed, 28 Jan 2015 19:40:16 +0000
Subject: [sdiy] Aaron's silly VCA/OTA video
Message-ID: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>

I can?t remember if I had e-mailed the list about this or not?

?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:

https://www.youtube.com/watch?v=I8v0VGsxElA

Anyway, someone somewhere might enjoy this, so here you go. :)

- Aaron

From niroke at tampabay.rr.com  Wed Jan 28 21:19:02 2015
From: niroke at tampabay.rr.com (Nicholas Keller)
Date: Wed, 28 Jan 2015 15:19:02 -0500
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
Message-ID: <48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>


Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.  
Thanks!

Nick



> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
> 
> I can?t remember if I had e-mailed the list about this or not?
> 
> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
> 
> https://www.youtube.com/watch?v=I8v0VGsxElA
> 
> Anyway, someone somewhere might enjoy this, so here you go. :)
> 
> - Aaron
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From admin at bugbrand.co.uk  Wed Jan 28 22:12:26 2015
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Wed, 28 Jan 2015 21:12:26 +0000
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
Message-ID: <54C950BA.1060109@bugbrand.co.uk>

Smallbear -- http://smallbear-electronics.mybigcommerce.com/ic-v2159d/
(great place!)

On 28/01/2015 20:19, Nicholas Keller wrote:
> Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.
> Thanks!
>
> Nick
>
>
>
>> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>>
>> I can?t remember if I had e-mailed the list about this or not?
>>
>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>>
>> https://www.youtube.com/watch?v=I8v0VGsxElA
>>
>> Anyway, someone somewhere might enjoy this, so here you go. :)
>>
>> - 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

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk



From abide at dmdrafting.com  Wed Jan 28 22:44:09 2015
From: abide at dmdrafting.com (Dave Magnuson)
Date: Wed, 28 Jan 2015 16:44:09 -0500
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
Message-ID: <002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>

Small Bear has quite a few cool audio chips (including 2159)

http://smallbear-electronics.mybigcommerce.com/coolaudio-1/

Dave Magnuson

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
Sent: Wednesday, January 28, 2015 3:19 PM
To: synth-diy List
Subject: [sdiy] Where to buy Cool Audio V2159


Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.  
Thanks!

Nick



> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
> 
> I can?t remember if I had e-mailed the list about this or not?
> 
> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
> 
> https://www.youtube.com/watch?v=I8v0VGsxElA
> 
> Anyway, someone somewhere might enjoy this, so here you go. :)
> 
> - 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 niroke at tampabay.rr.com  Thu Jan 29 01:14:43 2015
From: niroke at tampabay.rr.com (Nicholas Keller)
Date: Wed, 28 Jan 2015 19:14:43 -0500
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
Message-ID: <078001d03b58$95c34e70$c149eb50$@rr.com>

Thanks to all that replied!  Small Bear can certainly sort me out in the US and I actually ordered a CA3080 from them a few weeks ago.  But, I need to find a quick source for a friend in Austria.  Any ideas?

nick




-----Original Message-----
From: Dave Magnuson [mailto:abide at dmdrafting.com] 
Sent: Wednesday, January 28, 2015 4:44 PM
To: 'Nicholas Keller'; 'synth-diy List'
Subject: RE: [sdiy] Where to buy Cool Audio V2159

Small Bear has quite a few cool audio chips (including 2159)

http://smallbear-electronics.mybigcommerce.com/coolaudio-1/

Dave Magnuson

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
Sent: Wednesday, January 28, 2015 3:19 PM
To: synth-diy List
Subject: [sdiy] Where to buy Cool Audio V2159


Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.  
Thanks!

Nick



> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
> 
> I can?t remember if I had e-mailed the list about this or not?
> 
> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
> 
> https://www.youtube.com/watch?v=I8v0VGsxElA
> 
> Anyway, someone somewhere might enjoy this, so here you go. :)
> 
> - 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 yves.usson at imag.fr  Thu Jan 29 09:05:51 2015
From: yves.usson at imag.fr (yves usson)
Date: Thu, 29 Jan 2015 09:05:51 +0100
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
Message-ID: <54C9E9DF.8040804@imag.fr>

That's cool Aaron

Yves

Le 28/01/15 20:40, Lanterman, Aaron a ?crit :
> I can?t remember if I had e-mailed the list about this or not?
>
> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>
> https://www.youtube.com/watch?v=I8v0VGsxElA
>
> Anyway, someone somewhere might enjoy this, so here you go. :)
>
> - Aaron
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From jdelgoulet at free.fr  Thu Jan 29 10:40:01 2015
From: jdelgoulet at free.fr (Julien Delgoulet)
Date: Thu, 29 Jan 2015 10:40:01 +0100
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
Message-ID: <EBEF7DD3-14D6-4EE8-B980-3F14C2D703E9@free.fr>

Love it !
We want more !

Le 28 janv. 2015 ? 20:40, Lanterman, Aaron <lanterma at ece.gatech.edu> a ?crit :

> I can?t remember if I had e-mailed the list about this or not?
> 
> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
> 
> https://www.youtube.com/watch?v=I8v0VGsxElA
> 
> Anyway, someone somewhere might enjoy this, so here you go. :)
> 
> - Aaron
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From admin at bugbrand.co.uk  Thu Jan 29 12:36:43 2015
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Thu, 29 Jan 2015 11:36:43 +0000
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <078001d03b58$95c34e70$c149eb50$@rr.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
	<078001d03b58$95c34e70$c149eb50$@rr.com>
Message-ID: <54CA1B4B.9020909@bugbrand.co.uk>

Really, SmallBear still are the best for EU.
I've found their USPS standard postage rates VERY quick from US-to-UK - 
like under a week.
I don't know any EU suppliers for Coolaudio stuff..

Does it absolutely have to be the V2159? Is there a chance to track down 
a THAT version? (ebay, for example)
Are the THAT2180/2181 not similar? (They're pin compatible, surely?)
If so - ProfusionPLC (UK?) are good to check.

Best, Tom

On 29/01/2015 00:14, Nicholas Keller wrote:
> Thanks to all that replied!  Small Bear can certainly sort me out in the US and I actually ordered a CA3080 from them a few weeks ago.  But, I need to find a quick source for a friend in Austria.  Any ideas?
>
> nick
>
>
>
>
> -----Original Message-----
> From: Dave Magnuson [mailto:abide at dmdrafting.com]
> Sent: Wednesday, January 28, 2015 4:44 PM
> To: 'Nicholas Keller'; 'synth-diy List'
> Subject: RE: [sdiy] Where to buy Cool Audio V2159
>
> Small Bear has quite a few cool audio chips (including 2159)
>
> http://smallbear-electronics.mybigcommerce.com/coolaudio-1/
>
> Dave Magnuson
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
> Sent: Wednesday, January 28, 2015 3:19 PM
> To: synth-diy List
> Subject: [sdiy] Where to buy Cool Audio V2159
>
>
> Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.
> Thanks!
>
> Nick
>
>
>
>> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>>
>> I can?t remember if I had e-mailed the list about this or not?
>>
>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>>
>> https://www.youtube.com/watch?v=I8v0VGsxElA
>>
>> Anyway, someone somewhere might enjoy this, so here you go. :)
>>
>> - 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

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk



From niroke at tampabay.rr.com  Thu Jan 29 14:18:31 2015
From: niroke at tampabay.rr.com (Nicholas Keller)
Date: Thu, 29 Jan 2015 08:18:31 -0500
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <54CA1B4B.9020909@bugbrand.co.uk>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
	<078001d03b58$95c34e70$c149eb50$@rr.com>
	<54CA1B4B.9020909@bugbrand.co.uk>
Message-ID: <32B59825-34D7-466D-919C-4E7C5ABD2996@tampabay.rr.com>

Tom,

Thanks for your reply. I'm in Florida, US, trying to coach someone in Austria in troubleshooting and fixing a Doepfer A-131 VCA which he accidentally shorted.  Doepfer lists the part as THAT2159/V2159/SA2159, and his unit uses the V2159 which I had assumed would be the most affordable replacement.  I've already suggested contacting Doepfer directly.  

Perhaps you can tell me if my idea is even close to correct. The circuit uses one V2159 and a 5532 which I guessed would handle CV summing and audio input or output buffering, schematic is not published.  He says that he gets some signal through to the output, but it is very weak and there is no CV control.  I suggested he start by replacing the 5532, and only then deal with the V2159 (as that chip is not socketed) if the module still does not work.  Sound about right? 

Nick


> On Jan 29, 2015, at 6:36 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
> 
> Really, SmallBear still are the best for EU.
> I've found their USPS standard postage rates VERY quick from US-to-UK - like under a week.
> I don't know any EU suppliers for Coolaudio stuff..
> 
> Does it absolutely have to be the V2159? Is there a chance to track down a THAT version? (ebay, for example)
> Are the THAT2180/2181 not similar? (They're pin compatible, surely?)
> If so - ProfusionPLC (UK?) are good to check.
> 
> Best, Tom
> 
>> On 29/01/2015 00:14, Nicholas Keller wrote:
>> Thanks to all that replied!  Small Bear can certainly sort me out in the US and I actually ordered a CA3080 from them a few weeks ago.  But, I need to find a quick source for a friend in Austria.  Any ideas?
>> 
>> nick
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: Dave Magnuson [mailto:abide at dmdrafting.com]
>> Sent: Wednesday, January 28, 2015 4:44 PM
>> To: 'Nicholas Keller'; 'synth-diy List'
>> Subject: RE: [sdiy] Where to buy Cool Audio V2159
>> 
>> Small Bear has quite a few cool audio chips (including 2159)
>> 
>> http://smallbear-electronics.mybigcommerce.com/coolaudio-1/
>> 
>> Dave Magnuson
>> 
>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
>> Sent: Wednesday, January 28, 2015 3:19 PM
>> To: synth-diy List
>> Subject: [sdiy] Where to buy Cool Audio V2159
>> 
>> 
>> Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.
>> Thanks!
>> 
>> Nick
>> 
>> 
>> 
>>> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>>> 
>>> I can?t remember if I had e-mailed the list about this or not?
>>> 
>>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>>> 
>>> https://www.youtube.com/watch?v=I8v0VGsxElA
>>> 
>>> Anyway, someone somewhere might enjoy this, so here you go. :)
>>> 
>>> - 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
> 
> -- 
> BugBrand LTD
> UK company No. 07199808
> VAT No. GB 988 2629 57
> 1 Ninetree Hill
> BRISTOL BS1 3SB
> United Kingdom
> www.bugbrand.co.uk
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From admin at bugbrand.co.uk  Thu Jan 29 16:23:21 2015
From: admin at bugbrand.co.uk (Tom Bugs)
Date: Thu, 29 Jan 2015 15:23:21 +0000
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <32B59825-34D7-466D-919C-4E7C5ABD2996@tampabay.rr.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
	<078001d03b58$95c34e70$c149eb50$@rr.com>
	<54CA1B4B.9020909@bugbrand.co.uk>
	<32B59825-34D7-466D-919C-4E7C5ABD2996@tampabay.rr.com>
Message-ID: <54CA5069.50003@bugbrand.co.uk>

Please take with a hefty pinch of salt, but...

2159 (THAT? DBX?) is maybe a replacement / compatible with 2150 (eg. 
http://www.thatcorp.com/datashts/THAT_2150-Series_Datasheet.pdf)
That 2150 datasheet says OBSOLETE - see 2180/2181 (eg. 
http://www.thatcorp.com/datashts/THAT_2180-Series_Datasheet.pdf)
They all have the same pinouts.. and similar example circuits.
(ftp://all-electric.com/behringer-cybermix-cm8000-data/V2159_DATASHEET%20%28That2159%20compatible%29.pdf)

The V2159 does not state the sensitivity of the control port, though..

But, in essence, I think it is probably a relatively simple setup - 
NE5532 probably first half is for buffering the input, 2nd half does the 
I-to-V from VCA output.

Presumably there is also some circuitry for control voltage conditioning 
- would likely be a TL07x chip... You could check what is going to the 
EC- (or EC+) pin of the VCA (one is likely grounded)

Hope that helps...
Tom

On 29/01/2015 13:18, Nicholas Keller wrote:
> Tom,
>
> Thanks for your reply. I'm in Florida, US, trying to coach someone in Austria in troubleshooting and fixing a Doepfer A-131 VCA which he accidentally shorted.  Doepfer lists the part as THAT2159/V2159/SA2159, and his unit uses the V2159 which I had assumed would be the most affordable replacement.  I've already suggested contacting Doepfer directly.
>
> Perhaps you can tell me if my idea is even close to correct. The circuit uses one V2159 and a 5532 which I guessed would handle CV summing and audio input or output buffering, schematic is not published.  He says that he gets some signal through to the output, but it is very weak and there is no CV control.  I suggested he start by replacing the 5532, and only then deal with the V2159 (as that chip is not socketed) if the module still does not work.  Sound about right?
>
> Nick
>
>
>> On Jan 29, 2015, at 6:36 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
>>
>> Really, SmallBear still are the best for EU.
>> I've found their USPS standard postage rates VERY quick from US-to-UK - like under a week.
>> I don't know any EU suppliers for Coolaudio stuff..
>>
>> Does it absolutely have to be the V2159? Is there a chance to track down a THAT version? (ebay, for example)
>> Are the THAT2180/2181 not similar? (They're pin compatible, surely?)
>> If so - ProfusionPLC (UK?) are good to check.
>>
>> Best, Tom
>>
>>> On 29/01/2015 00:14, Nicholas Keller wrote:
>>> Thanks to all that replied!  Small Bear can certainly sort me out in the US and I actually ordered a CA3080 from them a few weeks ago.  But, I need to find a quick source for a friend in Austria.  Any ideas?
>>>
>>> nick
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: Dave Magnuson [mailto:abide at dmdrafting.com]
>>> Sent: Wednesday, January 28, 2015 4:44 PM
>>> To: 'Nicholas Keller'; 'synth-diy List'
>>> Subject: RE: [sdiy] Where to buy Cool Audio V2159
>>>
>>> Small Bear has quite a few cool audio chips (including 2159)
>>>
>>> http://smallbear-electronics.mybigcommerce.com/coolaudio-1/
>>>
>>> Dave Magnuson
>>>
>>> -----Original Message-----
>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
>>> Sent: Wednesday, January 28, 2015 3:19 PM
>>> To: synth-diy List
>>> Subject: [sdiy] Where to buy Cool Audio V2159
>>>
>>>
>>> Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.
>>> Thanks!
>>>
>>> Nick
>>>
>>>
>>>
>>>> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>>>>
>>>> I can?t remember if I had e-mailed the list about this or not?
>>>>
>>>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>>>>
>>>> https://www.youtube.com/watch?v=I8v0VGsxElA
>>>>
>>>> Anyway, someone somewhere might enjoy this, so here you go. :)
>>>>
>>>> - 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
>> -- 
>> BugBrand LTD
>> UK company No. 07199808
>> VAT No. GB 988 2629 57
>> 1 Ninetree Hill
>> BRISTOL BS1 3SB
>> United Kingdom
>> www.bugbrand.co.uk
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>

-- 
BugBrand LTD
UK company No. 07199808
VAT No. GB 988 2629 57
1 Ninetree Hill
BRISTOL BS1 3SB
United Kingdom
www.bugbrand.co.uk



From dlmanley at sonic.net  Thu Jan 29 16:45:12 2015
From: dlmanley at sonic.net (Dave Manley)
Date: Thu, 29 Jan 2015 07:45:12 -0800
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <EBEF7DD3-14D6-4EE8-B980-3F14C2D703E9@free.fr>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<EBEF7DD3-14D6-4EE8-B980-3F14C2D703E9@free.fr>
Message-ID: <6e9fefa4-46e5-40bc-8981-cf570560f05d@email.android.com>

The start of the Aaron Academy?

:-)

On January 29, 2015 1:40:01 AM PST, Julien Delgoulet <jdelgoulet at free.fr> wrote:
>Love it !
>We want more !
>
>Le 28 janv. 2015 ? 20:40, Lanterman, Aaron <lanterma at ece.gatech.edu> a
>?crit :
>
>> I can?t remember if I had e-mailed the list about this or not?
>> 
>> ?anyway, I did a little experiment with a low-end Wacom tablet, and
>taped myself in my dining room talking about OTAs and VCAs. It turns
>out it?s pretty difficult to talk to an empty room:
>> 
>> https://www.youtube.com/watch?v=I8v0VGsxElA
>> 
>> Anyway, someone somewhere might enjoy this, so here you go. :)
>> 
>> - 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 dingebre at 3dphysics.net  Thu Jan 29 17:06:08 2015
From: dingebre at 3dphysics.net (David Ingebretsen)
Date: Thu, 29 Jan 2015 09:06:08 -0700
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <54CA1B4B.9020909@bugbrand.co.uk>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>	<078001d03b58$95c34e70$c149eb50$@rr.com>
	<54CA1B4B.9020909@bugbrand.co.uk>
Message-ID: <002a01d03bdd$7f389450$7da9bcf0$@3dphysics.net>

Mouser carries the THAT component line including the 2180 and 2181.

David

>> -----Original Message-----
>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>> bounces at dropmix.xs4all.nl] On Behalf Of Tom Bugs
>> Sent: Thursday, January 29, 2015 4:37 AM
>> To: synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] Where to buy Cool Audio V2159
>> 
>> Really, SmallBear still are the best for EU.
>> I've found their USPS standard postage rates VERY quick from US-to-UK -
>> like under a week.
>> I don't know any EU suppliers for Coolaudio stuff..
>> 
>> Does it absolutely have to be the V2159? Is there a chance to track down a
>> THAT version? (ebay, for example) Are the THAT2180/2181 not similar?
>> (They're pin compatible, surely?) If so - ProfusionPLC (UK?) are good to
>> check.
>> 
>> Best, Tom
>> 
>> On 29/01/2015 00:14, Nicholas Keller wrote:
>> > Thanks to all that replied!  Small Bear can certainly sort me out in the US
>> and I actually ordered a CA3080 from them a few weeks ago.  But, I need
>> to find a quick source for a friend in Austria.  Any ideas?
>> >
>> > nick
>> >
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: Dave Magnuson [mailto:abide at dmdrafting.com]
>> > Sent: Wednesday, January 28, 2015 4:44 PM
>> > To: 'Nicholas Keller'; 'synth-diy List'
>> > Subject: RE: [sdiy] Where to buy Cool Audio V2159
>> >
>> > Small Bear has quite a few cool audio chips (including 2159)
>> >
>> > http://smallbear-electronics.mybigcommerce.com/coolaudio-1/
>> >
>> > Dave Magnuson
>> >
>> > -----Original Message-----
>> > From: synth-diy-bounces at dropmix.xs4all.nl
>> > [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas
>> > Keller
>> > Sent: Wednesday, January 28, 2015 3:19 PM
>> > To: synth-diy List
>> > Subject: [sdiy] Where to buy Cool Audio V2159
>> >
>> >
>> > Does anyone know a source in the EU (and U.S.) where small quantities
>> (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find
>> one via Google, and Cool Audio has not responded to my email.
>> > Thanks!
>> >
>> > Nick
>> >
>> >
>> >
>> >> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron
>> <lanterma at ece.gatech.edu> wrote:
>> >>
>> >> I can?t remember if I had e-mailed the list about this or not?
>> >>
>> >> ?anyway, I did a little experiment with a low-end Wacom tablet, and
>> taped myself in my dining room talking about OTAs and VCAs. It turns out
>> it?s pretty difficult to talk to an empty room:
>> >>
>> >> https://www.youtube.com/watch?v=I8v0VGsxElA
>> >>
>> >> Anyway, someone somewhere might enjoy this, so here you go. :)
>> >>
>> >> - 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
>> 
>> --
>> BugBrand LTD
>> UK company No. 07199808
>> VAT No. GB 988 2629 57
>> 1 Ninetree Hill
>> BRISTOL BS1 3SB
>> United Kingdom
>> www.bugbrand.co.uk
>> 
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From niroke at tampabay.rr.com  Thu Jan 29 17:08:27 2015
From: niroke at tampabay.rr.com (Nicholas Keller)
Date: Thu, 29 Jan 2015 11:08:27 -0500
Subject: [sdiy] Where to buy Cool Audio V2159
In-Reply-To: <54CA5069.50003@bugbrand.co.uk>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<48B07AAF-3A1B-41C3-861C-91CEB2938297@tampabay.rr.com>
	<002601d03b43$8cf46960$a6dd3c20$@dmdrafting.com>
	<078001d03b58$95c34e70$c149eb50$@rr.com>
	<54CA1B4B.9020909@bugbrand.co.uk>
	<32B59825-34D7-466D-919C-4E7C5ABD2996@tampabay.rr.com>
	<54CA5069.50003@bugbrand.co.uk>
Message-ID: <E2040D82-2967-4594-BAB2-0C1CCCC5D644@tampabay.rr.com>

Those are the only two chips, two transistors, 3-4 trimmers, caps and resistors. 

I'll let the owner know that starting with the 5532 makes sense and then to source the V2159 either from SmallBear US or from Deopfer themselves.  

Thanks!

Nick



> On Jan 29, 2015, at 10:23 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
> 
> Please take with a hefty pinch of salt, but...
> 
> 2159 (THAT? DBX?) is maybe a replacement / compatible with 2150 (eg. http://www.thatcorp.com/datashts/THAT_2150-Series_Datasheet.pdf)
> That 2150 datasheet says OBSOLETE - see 2180/2181 (eg. http://www.thatcorp.com/datashts/THAT_2180-Series_Datasheet.pdf)
> They all have the same pinouts.. and similar example circuits.
> (ftp://all-electric.com/behringer-cybermix-cm8000-data/V2159_DATASHEET%20%28That2159%20compatible%29.pdf)
> 
> The V2159 does not state the sensitivity of the control port, though..
> 
> But, in essence, I think it is probably a relatively simple setup - NE5532 probably first half is for buffering the input, 2nd half does the I-to-V from VCA output.
> 
> Presumably there is also some circuitry for control voltage conditioning - would likely be a TL07x chip... You could check what is going to the EC- (or EC+) pin of the VCA (one is likely grounded)
> 
> Hope that helps...
> Tom
> 
>> On 29/01/2015 13:18, Nicholas Keller wrote:
>> Tom,
>> 
>> Thanks for your reply. I'm in Florida, US, trying to coach someone in Austria in troubleshooting and fixing a Doepfer A-131 VCA which he accidentally shorted.  Doepfer lists the part as THAT2159/V2159/SA2159, and his unit uses the V2159 which I had assumed would be the most affordable replacement.  I've already suggested contacting Doepfer directly.
>> 
>> Perhaps you can tell me if my idea is even close to correct. The circuit uses one V2159 and a 5532 which I guessed would handle CV summing and audio input or output buffering, schematic is not published.  He says that he gets some signal through to the output, but it is very weak and there is no CV control.  I suggested he start by replacing the 5532, and only then deal with the V2159 (as that chip is not socketed) if the module still does not work.  Sound about right?
>> 
>> Nick
>> 
>> 
>>> On Jan 29, 2015, at 6:36 AM, Tom Bugs <admin at bugbrand.co.uk> wrote:
>>> 
>>> Really, SmallBear still are the best for EU.
>>> I've found their USPS standard postage rates VERY quick from US-to-UK - like under a week.
>>> I don't know any EU suppliers for Coolaudio stuff..
>>> 
>>> Does it absolutely have to be the V2159? Is there a chance to track down a THAT version? (ebay, for example)
>>> Are the THAT2180/2181 not similar? (They're pin compatible, surely?)
>>> If so - ProfusionPLC (UK?) are good to check.
>>> 
>>> Best, Tom
>>> 
>>>> On 29/01/2015 00:14, Nicholas Keller wrote:
>>>> Thanks to all that replied!  Small Bear can certainly sort me out in the US and I actually ordered a CA3080 from them a few weeks ago.  But, I need to find a quick source for a friend in Austria.  Any ideas?
>>>> 
>>>> nick
>>>> 
>>>> 
>>>> 
>>>> 
>>>> -----Original Message-----
>>>> From: Dave Magnuson [mailto:abide at dmdrafting.com]
>>>> Sent: Wednesday, January 28, 2015 4:44 PM
>>>> To: 'Nicholas Keller'; 'synth-diy List'
>>>> Subject: RE: [sdiy] Where to buy Cool Audio V2159
>>>> 
>>>> Small Bear has quite a few cool audio chips (including 2159)
>>>> 
>>>> http://smallbear-electronics.mybigcommerce.com/coolaudio-1/
>>>> 
>>>> Dave Magnuson
>>>> 
>>>> -----Original Message-----
>>>> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Nicholas Keller
>>>> Sent: Wednesday, January 28, 2015 3:19 PM
>>>> To: synth-diy List
>>>> Subject: [sdiy] Where to buy Cool Audio V2159
>>>> 
>>>> 
>>>> Does anyone know a source in the EU (and U.S.) where small quantities (like 1 pc. If possible) of V2159 VCA chips can be purchased?  I can't find one via Google, and Cool Audio has not responded to my email.
>>>> Thanks!
>>>> 
>>>> Nick
>>>> 
>>>> 
>>>> 
>>>>> On Jan 28, 2015, at 2:40 PM, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>>>>> 
>>>>> I can?t remember if I had e-mailed the list about this or not?
>>>>> 
>>>>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>>>>> 
>>>>> https://www.youtube.com/watch?v=I8v0VGsxElA
>>>>> 
>>>>> Anyway, someone somewhere might enjoy this, so here you go. :)
>>>>> 
>>>>> - 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
>>> -- 
>>> BugBrand LTD
>>> UK company No. 07199808
>>> VAT No. GB 988 2629 57
>>> 1 Ninetree Hill
>>> BRISTOL BS1 3SB
>>> United Kingdom
>>> www.bugbrand.co.uk
>>> 
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> -- 
> BugBrand LTD
> UK company No. 07199808
> VAT No. GB 988 2629 57
> 1 Ninetree Hill
> BRISTOL BS1 3SB
> United Kingdom
> www.bugbrand.co.uk
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From antoniotuzzi at gmail.com  Thu Jan 29 18:21:18 2015
From: antoniotuzzi at gmail.com (Antonio Tuzzi)
Date: Thu, 29 Jan 2015 18:21:18 +0100
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <EBEF7DD3-14D6-4EE8-B980-3F14C2D703E9@free.fr>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<EBEF7DD3-14D6-4EE8-B980-3F14C2D703E9@free.fr>
Message-ID: <C7603EA9-067C-402B-96F4-94E72B594597@gmail.com>

MORE MORE MORE!!! :
On 29/gen/2015, at 10:40, Julien Delgoulet <jdelgoulet at free.fr> wrote:

> Le 28 janv. 2015 ? 20:40, Lanterman, Aaron <lanterma at ece.gatech.edu> a ?crit :
> 
>> I can?t remember if I had e-mailed the list about this or not?
>> 
>> ?anyway, I did a little experiment with a low-end Wacom tablet, and taped myself in my dining room talking about OTAs and VCAs. It turns out it?s pretty difficult to talk to an empty room:
>> 
>> https://www.youtube.com/watch?v=I8v0VGsxElA
>> 
>> Anyway, someone somewhere might enjoy this, so here you go. :)
>> 
>> - 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 anpitkam at hotmail.com  Thu Jan 29 19:09:56 2015
From: anpitkam at hotmail.com (=?iso-8859-1?B?QW50dGkgUGl0a+Rt5Gtp?=)
Date: Thu, 29 Jan 2015 20:09:56 +0200
Subject: [sdiy] Where to get good no-clean solder in EU?
In-Reply-To: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>
References: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>
Message-ID: <DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>

Hi,

I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245?

Hmm, I guess I should also get some no-clean desoldering wick.

Regards,
Antti 		 	   		  

From charlie at finitemonkeys.com  Thu Jan 29 19:37:31 2015
From: charlie at finitemonkeys.com (charlie wallace)
Date: Thu, 29 Jan 2015 10:37:31 -0800
Subject: [sdiy] Where to get good no-clean solder in EU?
In-Reply-To: <DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>
References: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>
	<DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>
Message-ID: <CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>

future stock the no-clean.

http://uk.futureelectronics.com/en/technologies/production-products/solder/solder-wire/Pages/9221516-24-6337-8807.aspx?IM=0

http://appelectronics.co.uk/ are the official distributors uk side.

personally after trying a few different brands, i landed on aim
solder, though i've used their no-clean , i use the "cleanable"
version instead since we do a lot of boards that people handle
afterward they're built


On Thu, Jan 29, 2015 at 10:09 AM, Antti Pitk?m?ki <anpitkam at hotmail.com> wrote:
> Hi,
>
> I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245?
>
> Hmm, I guess I should also get some no-clean desoldering wick.
>
> Regards,
> Antti
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


From jarno.verhoeven at ziggo.nl  Thu Jan 29 20:25:32 2015
From: jarno.verhoeven at ziggo.nl (Jarno Verhoeven)
Date: Thu, 29 Jan 2015 20:25:32 +0100
Subject: [sdiy] Where to get good no-clean solder in EU?
Message-ID: <20150129192538.325D52E22AB2@dropmix.xs4all.nl>

You should be able to get Stannol, and they make fine no-clean solder as well.On 29 Jan 2015 19:09, Antti Pitk?m?ki <anpitkam at hotmail.com> wrote:
>
> Hi, 
>
> I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245? 
>
> Hmm, I guess I should also get some no-clean desoldering wick. 
>
> Regards, 
> Antti ?? ? 
> _______________________________________________ 
> Synth-diy mailing list 
> Synth-diy at dropmix.xs4all.nl 
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 

From jackdamery at hotmail.co.uk  Thu Jan 29 21:48:43 2015
From: jackdamery at hotmail.co.uk (Jack Jackson)
Date: Thu, 29 Jan 2015 20:48:43 +0000
Subject: [sdiy] JX8P 7V unreg Path?
Message-ID: <DUB123-W11B531C100CBE2924B48F97300@phx.gbl>

I've blown the 7V unreg to my PG800 on my JX8P. Looking at the service manual it's not clear what in the path could have blown. I see the 7V is taken from before the 7805 regulator on the power supply. But I can't see anything else in that path.

Any ideas?

Best Regards,
Jack
 		 	   		  

From gordonjcp at gjcp.net  Thu Jan 29 22:04:46 2015
From: gordonjcp at gjcp.net (gordonjcp at gjcp.net)
Date: Thu, 29 Jan 2015 21:04:46 +0000
Subject: [sdiy] JX8P 7V unreg Path?
In-Reply-To: <DUB123-W11B531C100CBE2924B48F97300@phx.gbl>
References: <DUB123-W11B531C100CBE2924B48F97300@phx.gbl>
Message-ID: <20150129210446.GA24446@gjcp.net>

On Thu, Jan 29, 2015 at 08:48:43PM +0000, Jack Jackson wrote:
> I've blown the 7V unreg to my PG800 on my JX8P. Looking at the service manual it's not clear what in the path could have blown. I see the 7V is taken from before the 7805 regulator on the power supply. But I can't see anything else in that path.
> 

I take it the 5V is still present?  Check for cracks in the print, dry joints, crappy connectors etc. if you haven't already...

-- 
Gordonjcp MM0YEQ



From anpitkam at hotmail.com  Thu Jan 29 22:36:54 2015
From: anpitkam at hotmail.com (=?iso-8859-1?B?QW50dGkgUGl0a+Rt5Gtp?=)
Date: Thu, 29 Jan 2015 23:36:54 +0200
Subject: [sdiy] Where to get good no-clean solder in EU?
In-Reply-To: <CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>
References: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>,
	<DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>,
	<CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>
Message-ID: <DUB122-W418D302DF38F6873492712CA300@phx.gbl>

Hi,

Thank you so much! Finally I can get that stuff!

Oh, and is there any no-clean desoldering wick that is particularly good, or is any of them OK as long as it is no-clean? Or is flux an issue with desoldering wicks at all?

Thanks again,
Antti

----------------------------------------
> Date: Thu, 29 Jan 2015 10:37:31 -0800
> From: charlie at finitemonkeys.com
> CC: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Where to get good no-clean solder in EU?
>
> future stock the no-clean.
>
> http://uk.futureelectronics.com/en/technologies/production-products/solder/solder-wire/Pages/9221516-24-6337-8807.aspx?IM=0
>
> http://appelectronics.co.uk/ are the official distributors uk side.
>
> personally after trying a few different brands, i landed on aim
> solder, though i've used their no-clean , i use the "cleanable"
> version instead since we do a lot of boards that people handle
> afterward they're built
>
>
> On Thu, Jan 29, 2015 at 10:09 AM, Antti Pitk?m?ki <anpitkam at hotmail.com> wrote:
>> Hi,
>>
>> I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245?
>>
>> Hmm, I guess I should also get some no-clean desoldering wick.
>>
>> Regards,
>> Antti
>> _______________________________________________
>> 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 indigoid at oldcorollas.org  Thu Jan 29 23:51:20 2015
From: indigoid at oldcorollas.org (john slee)
Date: Fri, 30 Jan 2015 09:51:20 +1100
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
Message-ID: <CAK+JDy2HLXDjufN-PDikswjEB6+p91tdu07OL+yDqmWDURXwWg@mail.gmail.com>

On 29 January 2015 at 06:40, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
> Anyway, someone somewhere might enjoy this, so here you go. :)

Wonderful for this SDIY noob, thankyou!

Quite a lot like Khan Academy. I really liked it. Hope you can find
the time and inclination to do more :-)

John


From declareupdate at gmail.com  Fri Jan 30 00:10:23 2015
From: declareupdate at gmail.com (Chris McDowell)
Date: Thu, 29 Jan 2015 17:10:23 -0600
Subject: [sdiy] Aaron's silly VCA/OTA video
In-Reply-To: <CAK+JDy2HLXDjufN-PDikswjEB6+p91tdu07OL+yDqmWDURXwWg@mail.gmail.com>
References: <811739A9-A5C5-4949-8B7C-15EC22F88FFD@ece.gatech.edu>
	<CAK+JDy2HLXDjufN-PDikswjEB6+p91tdu07OL+yDqmWDURXwWg@mail.gmail.com>
Message-ID: <C95A1794-A6B6-4EE3-9ACC-5413E5BF0A34@gmail.com>

Yes! I really enjoyed the videos of you teaching at GA Tech, and this video was a rad step up from that. Big thanks! 

Chris
> On Jan 29, 2015, at 4:51 PM, john slee <indigoid at oldcorollas.org> wrote:
> 
> On 29 January 2015 at 06:40, Lanterman, Aaron <lanterma at ece.gatech.edu> wrote:
>> Anyway, someone somewhere might enjoy this, so here you go. :)
> 
> Wonderful for this SDIY noob, thankyou!
> 
> Quite a lot like Khan Academy. I really liked it. Hope you can find
> the time and inclination to do more :-)
> 
> John
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy



From modular at go2.pl  Fri Jan 30 09:02:32 2015
From: modular at go2.pl (Roman Sowa)
Date: Fri, 30 Jan 2015 09:02:32 +0100
Subject: [sdiy] Where to get good no-clean solder in EU?
In-Reply-To: <CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>
References: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>	<DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>
	<CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>
Message-ID: <54CB3A98.6080908@go2.pl>

I've also been using AIM 2.5% flux "glow core" for years, it's great. 
Settled on that after few other types before. AMTECH is also fine, I use 
10mils diameter from them.

You should find something proper at tme.eu

Roman

W dniu 2015-01-29 o 19:37, charlie wallace pisze:
> future stock the no-clean.
>
> http://uk.futureelectronics.com/en/technologies/production-products/solder/solder-wire/Pages/9221516-24-6337-8807.aspx?IM=0
>
> http://appelectronics.co.uk/ are the official distributors uk side.
>
> personally after trying a few different brands, i landed on aim
> solder, though i've used their no-clean , i use the "cleanable"
> version instead since we do a lot of boards that people handle
> afterward they're built
>
>
> On Thu, Jan 29, 2015 at 10:09 AM, Antti Pitk?m?ki <anpitkam at hotmail.com> wrote:
>> Hi,
>>
>> I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245?
>>
>> Hmm, I guess I should also get some no-clean desoldering wick.
>>
>> Regards,
>> Antti
>> _______________________________________________
>> 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 modular at go2.pl  Fri Jan 30 09:13:06 2015
From: modular at go2.pl (Roman Sowa)
Date: Fri, 30 Jan 2015 09:13:06 +0100
Subject: [sdiy] Where to get good no-clean solder in EU?
In-Reply-To: <DUB122-W418D302DF38F6873492712CA300@phx.gbl>
References: <DUB122-W32B14E6F6414D44817F03BCA430@phx.gbl>,
	<DUB122-W49E120C70F93905248BD8CCA300@phx.gbl>,
	<CAH2ZmXmHoXUYf_Azfo5mRtJmim-iD2E=Xo1TjDPLSQqn8Y3U0Q@mail.gmail.com>
	<DUB122-W418D302DF38F6873492712CA300@phx.gbl>
Message-ID: <54CB3D12.9070909@go2.pl>

I may be totally wrong here, but if there was water soluble or any other 
flux in solder wick, it would quickly become useless, because the copper 
corrosion caused by agressive flux. So I'd expect that all solder wicks 
are tinned in no-clean flux.

There is one well educated chemist among us in this list, who's actually 
making modulars, so he may elaborate more...

Roman

W dniu 2015-01-29 o 22:36, Antti Pitk?m?ki pisze:
> Hi,
>
> Thank you so much! Finally I can get that stuff!
>
> Oh, and is there any no-clean desoldering wick that is particularly good, or is any of them OK as long as it is no-clean? Or is flux an issue with desoldering wicks at all?
>
> Thanks again,
> Antti
>
> ----------------------------------------
>> Date: Thu, 29 Jan 2015 10:37:31 -0800
>> From: charlie at finitemonkeys.com
>> CC: synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] Where to get good no-clean solder in EU?
>>
>> future stock the no-clean.
>>
>> http://uk.futureelectronics.com/en/technologies/production-products/solder/solder-wire/Pages/9221516-24-6337-8807.aspx?IM=0
>>
>> http://appelectronics.co.uk/ are the official distributors uk side.
>>
>> personally after trying a few different brands, i landed on aim
>> solder, though i've used their no-clean , i use the "cleanable"
>> version instead since we do a lot of boards that people handle
>> afterward they're built
>>
>>
>> On Thu, Jan 29, 2015 at 10:09 AM, Antti Pitk?m?ki <anpitkam at hotmail.com> wrote:
>>> Hi,
>>>
>>> I've done some Synth DIY archive searching regarding good solder, and Kester 245 seems to be the way to go. Unfortunately I can't find this stuff for sale in EU. So what good no-clean solder my fellow Europeans use? Or is there a place in EU where I can order some Kester 245?
>>>
>>> Hmm, I guess I should also get some no-clean desoldering wick.
>>>
>>> Regards,
>>> Antti
>>> _______________________________________________
>>> 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 gordonjcp at gjcp.net  Fri Jan 30 10:30:21 2015
From: gordonjcp at gjcp.net (gordonjcp at gjcp.net)
Date: Fri, 30 Jan 2015 09:30:21 +0000
Subject: [sdiy] Digitech PDS1002 schematic?
Message-ID: <20150130093021.GB24446@gjcp.net>

Does anyone have a service manual or even just a circuit diagram for a Digitech DPS1002 2-Second Delay pedal?  I just picked one up that only works on the 500ms range - the 2s and 125ms don't appear to echo.

I wondered if it's maybe something to do with the 2-second muting when you switch ranges.  That works okay when you select 500ms, but may be staying on in the other ranges.  Or it might be something else totally...

-- 
Gordonjcp MM0YEQ



From Peter.Ullrich at kapsch.net  Fri Jan 30 10:58:56 2015
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Fri, 30 Jan 2015 09:58:56 +0000
Subject: [sdiy] Digitech PDS1002 schematic?
Message-ID: <8BF8151491B683469DBE3534B77A7286DB715448@S900X027.kapsch.co.at>

One of the two pages can be loaded from here:

http://s605.photobucket.com/user/pinkjimiphoton/media/digitechpds1002schem.gif.html

Ciao
Peter


-----Urspr?ngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von gordonjcp at gjcp.net
Gesendet: Freitag, 30. J?nner 2015 10:30
An: synth-diy at dropmix.xs4all.nl
Betreff: [sdiy] Digitech PDS1002 schematic?

Does anyone have a service manual or even just a circuit diagram for a Digitech DPS1002 2-Second Delay pedal?  I just picked one up that only works on the 500ms range - the 2s and 125ms don't appear to echo.

I wondered if it's maybe something to do with the 2-second muting when you switch ranges.  That works okay when you select 500ms, but may be staying on in the other ranges.  Or it might be something else totally...

-- 
Gordonjcp MM0YEQ

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



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, and is kindly asked to notify the sender and delete the e-mail immediately.



From Peter.Ullrich at kapsch.net  Fri Jan 30 11:27:29 2015
From: Peter.Ullrich at kapsch.net (Ullrich Peter)
Date: Fri, 30 Jan 2015 10:27:29 +0000
Subject: [sdiy] Digitech PDS1002 schematic?
Message-ID: <8BF8151491B683469DBE3534B77A7286DB715486@S900X027.kapsch.co.at>

The schematics can be loaded from this page - free registration required...
http://wiki.freestompboxes.org/viewtopic.php?f=1&t=3479

Ciao
Peter

-----Urspr?ngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von gordonjcp at gjcp.net
Gesendet: Freitag, 30. J?nner 2015 10:30
An: synth-diy at dropmix.xs4all.nl
Betreff: [sdiy] Digitech PDS1002 schematic?

Does anyone have a service manual or even just a circuit diagram for a Digitech DPS1002 2-Second Delay pedal?  I just picked one up that only works on the 500ms range - the 2s and 125ms don't appear to echo.

I wondered if it's maybe something to do with the 2-second muting when you switch ranges.  That works okay when you select 500ms, but may be staying on in the other ranges.  Or it might be something else totally...

-- 
Gordonjcp MM0YEQ

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



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, and is kindly asked to notify the sender and delete the e-mail immediately.



From fanwander at mnet-online.de  Fri Jan 30 12:01:14 2015
From: fanwander at mnet-online.de (Florian Anwander)
Date: Fri, 30 Jan 2015 12:01:14 +0100
Subject: [sdiy] JX8P 7V unreg Path?
In-Reply-To: <DUB123-W11B531C100CBE2924B48F97300@phx.gbl>
References: <DUB123-W11B531C100CBE2924B48F97300@phx.gbl>
Message-ID: <54CB647A.2080004@mnet-online.de>

Am 29.01.2015 um 21:48 schrieb Jack Jackson:
 > I've blown the 7V unreg to my PG800 on my JX8P.
Where are you measuring?
Are you measuring with the PG800/cable connected or without?

Florian


From gordonjcp at gjcp.net  Fri Jan 30 18:42:48 2015
From: gordonjcp at gjcp.net (gordonjcp at gjcp.net)
Date: Fri, 30 Jan 2015 17:42:48 +0000
Subject: [sdiy] Digitech PDS1002 schematic?
In-Reply-To: <20150130093021.GB24446@gjcp.net>
References: <20150130093021.GB24446@gjcp.net>
Message-ID: <20150130174248.GA29229@gjcp.net>

On Fri, Jan 30, 2015 at 09:30:21AM +0000, gordonjcp at gjcp.net wrote:
> Does anyone have a service manual or even just a circuit diagram for a Digitech DPS1002 2-Second Delay pedal?  I just picked one up that only works on the 500ms range - the 2s and 125ms don't appear to echo.
> 
> I wondered if it's maybe something to do with the 2-second muting when you switch ranges.  That works okay when you select 500ms, but may be staying on in the other ranges.  Or it might be something else totally...
> 

Thanks to a helpful suggestion from a list member who mailed me off-list (so presumably would like to be anonymous) I have got hold of the circuit diagram.  Two of the timing capacitors for the 2-second mute are indeed faulty.

They are the 13th and 14th faulty electrolytics I have replaced in 25 years, not counting cheap crappy switched-mode power supplies.

-- 
Gordonjcp MM0YEQ


From dixon at mail.ubc.ca  Fri Jan 30 20:16:04 2015
From: dixon at mail.ubc.ca (David G Dixon)
Date: Fri, 30 Jan 2015 11:16:04 -0800
Subject: [sdiy] Digitech PDS1002 schematic?
In-Reply-To: <20150130174248.GA29229@gjcp.net>
References: <20150130093021.GB24446@gjcp.net> <20150130174248.GA29229@gjcp.net>
Message-ID: <0F108C21B1674080B0545780F86FFA8A@galvanox01>

> Thanks to a helpful suggestion from a list member who mailed 
> me off-list (so presumably would like to be anonymous) I have 
> got hold of the circuit diagram.  Two of the timing 
> capacitors for the 2-second mute are indeed faulty.
> 
> They are the 13th and 14th faulty electrolytics I have 
> replaced in 25 years, not counting cheap crappy switched-mode 
> power supplies.


Wow, they used electrolytics for timing purposes?  I would never even
consider doing that in any of my personal builds or products.



From montalbanogm at gmail.com  Sat Jan 31 23:49:59 2015
From: montalbanogm at gmail.com (gm)
Date: Sat, 31 Jan 2015 14:49:59 -0800
Subject: [sdiy] CS70M aftertouch
Message-ID: <54CD5C17.6060604@gmail.com>

Currently working on a Yamaha CS70M with, among other problems, no 
response to keyboard aftertouch.
The service manual doesn't have much on this feature (other than a 
schematic of the sensor).
I need to understand how this is supposed to work.

It looks like there's a spring-mounted bar under the keyboard that is 
deflected out of position when pressure is applied;  this appears to 
deflect the metal plate mounted over the sensor.
With the keyboard in the upright position, I can manipulate this 
deflector to initiate the pressure-mod response;  it isn't working with 
the keyboard in the down position.

If someone who knows this unit could tell me the following:
--how critical is the angle of the deflector plate?
--how free is the spring-mounted bar supposed to be?  This one moves 
stiffly, and doesn't always return to original position.
--is there something else I should be looking at?
... I'd be most appreciative.

~GMM





