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2010-05-09 by sasami@hotkey.net.au
20k linear of the regular sort. Finding the zero position is usually not too hard. Center detent pots introduce a "dead band" where it is impossible to make fine adjustments because they keep snapping into their detent position. Ken >What kind of pot do you need for the "processo
2010-05-09 by Pete
What kind of pot do you need for the "processor". Doesn't this pot need to be a center detent pot since it should always be at 0 when it's in the middle position? So when you turn the pot towards the left, it should be going negative and positive from 0 to the right, correct? Whe
2010-04-27 by spiralsect
Hi folks, as the subject says, I'm looking for a CGS56 Gate Converter PCB to add sub outs to my Bin-N-Tic. If anyone has a spare board lying around that they'd like to sell I'd be mighty obliged. Cheers, Adam-V
2010-04-23 by Jason Proctor
> >any idea what *would* make a difference? :-) >> >>if i'd reversed the transistors, i doubt i'd get any sound at all. >>there's not much to go wrong in the feedback path. > >If I knew the answer, don't you think I would have told you? So far ALL of >them that have failed that I
2010-04-23 by sasami@hotkey.net.au
>any idea what *would* make a difference? :-) > >if i'd reversed the transistors, i doubt i'd get any sound at all. >there's not much to go wrong in the feedback path. If I knew the answer, don't you think I would have told you? So far ALL of them that have failed that I have had
2010-04-23 by Jason Proctor
> >> >- if there's a way to wire up the resonance pot wrong? >>> >>>Three leads - so yes, it is possible! >> >>...only two of which go to the board. aha, maybe i short the wiper to >>the outer pin? that's probably it. i will try it on tonight. > >Actually, that won't make any dif
2010-04-23 by sasami@hotkey.net.au
>> >- if there's a way to wire up the resonance pot wrong? >> >>Three leads - so yes, it is possible! > >...only two of which go to the board. aha, maybe i short the wiper to >the outer pin? that's probably it. i will try it on tonight. Actually, that won't make any difference. _
2010-04-23 by Jason Proctor
> >- if there's a way to wire up the resonance pot wrong? > >Three leads - so yes, it is possible! ...only two of which go to the board. aha, maybe i short the wiper to the outer pin? that's probably it. i will try it on tonight.
2010-04-23 by sasami@hotkey.net.au
> > >> >i noticed that the output cap is 1uf on the board, but 10uf on the >>>schematic (the rev1 pre-2010 schem). probably not relevant to the >>>resonance problem, but otherwise significant? >> >>It's pretty insignificant - it just a coupling capacitor. Either is okay. >> >>The
2010-04-23 by Jason Proctor
> >i noticed that the output cap is 1uf on the board, but 10uf on the >>schematic (the rev1 pre-2010 schem). probably not relevant to the >>resonance problem, but otherwise significant? > >It's pretty insignificant - it just a coupling capacitor. Either is okay. > >The resonance
2010-04-19 by Richard Brewster
I made two mods to my VCS. I changed the 470K resistor to -15V on the TL071 to 590K. This results in better centering of the Bipolar output signal if you trim for a +5V maximum at the main output. I use switching jacks with a center switch lug. For the Processor input I ran a 200
2010-04-16 by tim.wade@l-3com.com
Juergen Haible "reinvented" the core of the VCS a few years ago and has a bit of a description of how it works here: http://www.jhaible.de/tonline_stuff/hj_vc_hadsr.html It is implemented as a much more conventional ADSR but as he points out the transistors don't need to be match
2010-04-16 by Logic Analog
thanx Dave!! see you at the Meet-up. d. To: cgs_synth@yahoogroups.com From: dave.leith@... Date: Thu, 15 Apr 2010 16:37:37 -0700 Subject: Re: [cgs_synth] CGS75 VCS Here's one article on matching transistors (original moog circuit) http://www.fantasyjackpalance.com/fjp/sound/synth
2010-04-15 by Pete
Thanks folks for the info. pete On Thu, Apr 15, 2010 at 5:02 PM, sasami@... > wrote: > > > >I could not match the NPNs with the PNPs at all. Just the pairs of each > >kind. > > That is not so inportant, as only one pair is used at a time - either the > npns or the pnps. It's two
2010-04-15 by sasami@hotkey.net.au
>I could not match the NPNs with the PNPs at all. Just the pairs of each >kind. That is not so inportant, as only one pair is used at a time - either the npns or the pnps. It's two differential pairs. Ken _______________________________________________________________________ Ken
2010-04-15 by Dave Leith
Here's one article on matching transistors (original moog circuit) http://www.fantasyjackpalance.com/fjp/sound/synth/synthdata/16-minimoog/002/905-matching-transistor.gif Here's more info on matching http://www.musicfromouterspace.com/analogsynth/TRANSISTORMATCHER/TRANSISTORMATCH
2010-04-15 by Richard Brewster
See page 6 of EN#39. For NPN connect the emitter to ground. Connect a 1.5 Meg resistor between the base and +15V, connect a multimeter measuring ma (milliamps) between the collector (- lead on the meter) and +15V. 1ma = HFE of 100, 2.5 ma = HFE of 250, etc. Just select two transi
2010-04-15 by Logic Analog
curious myself. does anyone have a link to the Electronotes technique described by Mr. Brewster??? thanx, MoogFool. To: cgs_synth@yahoogroups.com CC: 23isgood@... From: pugix@... Date: Thu, 15 Apr 2010 14:48:09 -0400 Subject: Re: [cgs_synth] CGS75 VCS I hand-matched the two 3904s
2010-04-15 by Richard Brewster
I hand-matched the two 3904s and the two 3906s. It is simple to do, but a little hard to describe. I found the technique in Electronotes. How important this is, I don't know. Richard Brewster http://pugix.com On 4/15/10 2:36 PM, Pete wrote: > I was wondering if the VCS would bene
2010-04-15 by Pete
I was wondering if the VCS would benefit from matching the transistors? pete -- www.p23.biz
2010-04-13 by sasami@hotkey.net.au
It is a military grade tube, so I suspect it has a good life. It is also using such a tiny current through its heater that there won't be a lot of stress. I've not heard of any cases of them dying yet though. My only corpse died at the hands of the postage system. Ken >Watching t
2010-04-13 by Richard Brewster
Watching that green glow coming through the crack between panels made me wonder if the 1J24B tube is going to burn out one day. How long is that going to be? I have some spares, but I was thinking it might be prudent to keep the module unplugged when I'm not using it. Richard Bre
2010-04-12 by sasami@hotkey.net.au
Whoever emailed me about this - sorry - but my computer lost your email while I was trying to respond. Put in the 330R. It replaces the 1k. The 47k resistors that needed to be omitted were only on the first version of the PCB. I will be updating the article soon. Ken ____________
2010-04-08 by sasami@hotkey.net.au
The pad labeled "0V" on the REV0.0 and VER1.0 versions of the CGS67 is actually connected to the -VE rail. You will need to connect to 0V elsewhere on the board. The pad in question was previously shown as the common 0V connection in the wiring diagram, so why no one has never re
2010-04-08 by Guy
--- In cgs_synth@yahoogroups.com , sasami@... wrote: > > >If using Ken's stackable configuration for the bandpass filter + mixer -- > as shown on the CGS30 page, is it doable/advisable to add a master level > control on the mixer ? > >And if doable, still done in the usual way (s
2010-04-07 by sasami@hotkey.net.au
>If using Ken's stackable configuration for the bandpass filter + mixer -- as shown on the CGS30 page, is it doable/advisable to add a master level control on the mixer ? >And if doable, still done in the usual way (skip resistor between a & b, connect pot instead) ? It's doable
2010-04-05 by Guy
If using Ken's stackable configuration for the bandpass filter + mixer -- as shown on the CGS30 page, is it doable/advisable to add a master level control on the mixer ? And if doable, still done in the usual way (skip resistor between a & b, connect pot instead) ? ~~ Had a good
2010-03-28 by spiralsect
Great. Thanks Ken. Cheers, Adam-V. --- In cgs_synth@yahoogroups.com , "cg_synth" wrote: > > I've used MKT in mine, and a whole bunch I made for someone else. They work just fine for me. > Ken > > --- In cgs_synth@yahoogroups.com , "spiralsect" wrote: > > > > Hi Folks, > > > > I r
2010-03-27 by Guy
Hi Gain in is not used. "Unbalance" is. I have used germanium diodes. All regular checks applied: shorts, polarization, etc... all seem to be ok. Power to the chips: okay. Continuity checks: all ok. Socket/pot wiring: okay, I guess. Resistor values: all ok. Output resistor: 100k.
2010-03-27 by sasami@hotkey.net.au
>When I power it up, the TL072 nearest the center of the PCB gets quite warm. Very very bad. Sort this out first. TL072 should stay stone cold. Somewhere you have a power supply error, or the chip is in backwards. Ken ______________________________________________________________
2010-03-27 by Andrew Scheidler
Having trouble with my Bissel lag project. When I power it up, the TL072 nearest the center of the PCB gets quite warm. With nothing plugged into the input, the output gives out a kind of triangle wave, kind of like there's a square wave at the input (?) I haven't yet tested vari
2010-03-25 by cg_synth
I've used MKT in mine, and a whole bunch I made for someone else. They work just fine for me. Ken --- In cgs_synth@yahoogroups.com , "spiralsect" wrote: > > Hi Folks, > > I recently joined the group as I've started building some of Ken's designs in Frac format. Some of you may al
2010-03-25 by spiralsect
Hi Folks, I recently joined the group as I've started building some of Ken's designs in Frac format. Some of you may already know me as Adam-V from various other forums. I've got a question or two about the polypropylene caps used in the S&H section of the analogue shift register
2010-03-14 by sasami@hotkey.net.au
>i noticed that the output cap is 1uf on the board, but 10uf on the >schematic (the rev1 pre-2010 schem). probably not relevant to the >resonance problem, but otherwise significant? It's pretty insignificant - it just a coupling capacitor. Either is okay. The resonance control do
2010-03-14 by Jason Proctor
thanks -- seems like there's not much to go wrong here! so basically something on the other side of that resonance pot is sucking harder than the cap & opamp? i noticed that the output cap is 1uf on the board, but 10uf on the schematic (the rev1 pre-2010 schem). probably not rele
2010-03-14 by sasami@hotkey.net.au
It is probably a bad joint or construction error, and it is probably elsewhere in the circuit, not directly in the resonance circuit. Ken >just "finished" my rev 1 steiner filter finally. thanks to John >Loffink for the mods and Richard Brewster for the before & after mod >schems
2010-03-14 by Jason Proctor
just "finished" my rev 1 steiner filter finally. thanks to John Loffink for the mods and Richard Brewster for the before & after mod schems. the filter works fine apart from the resonance, which seems to act as a volume control! i wired it up so that "full" resonance would be no
2010-03-07 by sasami@hotkey.net.au
Thanks. Corrected. Ken >Ken, > >in the CGS41 schematic, the REF02 is shown with pin 3 to the >positive rail. I think you meant pin 2. On the PCB, it's pin 2. > > http://cgs.synth.net/modules/pic/schem_cgs41_diatonic_converter.gif > >-- >André Majorel http://www.teaser.fr/~amajore
2010-03-07 by Andre Majorel
Ken, in the CGS41 schematic, the REF02 is shown with pin 3 to the positive rail. I think you meant pin 2. On the PCB, it's pin 2. http://cgs.synth.net/modules/pic/schem_cgs41_diatonic_converter.gif -- André Majorel http://www.teaser.fr/~amajorel/
2010-02-26 by dhamaryder
hello, I built the CGS VCO(ver.4). Took me a couple of years collecting the parts and finally putting it together on the PCB board i got from Ken Stone, and it didn't work. All I got was a loud hum. The problem is I'm not an engineer and don't really have a good understanding of
2010-02-06 by onthebeachestoo
oh, wow. that's a great forum. Thanks for the lead. haha, I'll be spending some time there now. --- In cgs_synth@yahoogroups.com , T3h caTmaN wrote: > > > tried MuffWiggler's forum yet?? > > i know there's many fans of Metasonix their. > > d. > > > To: cgs_synth@yahoogroups.com >
2010-02-06 by T3h caTmaN
tried MuffWiggler's forum yet?? i know there's many fans of Metasonix their. d. To: cgs_synth@yahoogroups.com From: onthebeachestoo@... Date: Sat, 6 Feb 2010 00:28:07 +0000 Subject: [cgs_synth] cgs tube experimenter board Hi everyone Going to start building some experimental modu
2010-02-06 by onthebeachestoo
Hi everyone Going to start building some experimental modules, and I'm curious about the cgs27 7pin tube experimenter board. It's intriguingly simple, and I'd love to get an interesting quick and dirty wave folder working Can anyone describe the temperament of this device? I know
2010-02-04 by regrehan
Just joined this group. Kudos to Ken Stone for the website and all the information. My son is a senior in high school, and is in the process of building a small music synthesizer as part of his computers and electronics class. He has already built a couple of the 4069-based VCOs
2010-01-31 by julianfincham
just very briefly, as i feel a bit like a spammer at the moment : / i have a load of panels for sale at the moment, and one of them is quite a nice (but with defects) utility lfo panel in euro format for sale (hence the note here) photos / price etc. here - http://www.thebeast.co
2010-01-26 by Doug
Hi and welcome. I'm suggesting that another thread be started. I've got a similar dilema with a pedalboard for my SteamSynth modular. *** Moderator, please bump to a new thread? *** --- In cgs_synth@yahoogroups.com , "nervejam" wrote: > > Hi, I've just stumbled across cgs.synth.n
2010-01-26 by nervejam
Hi, I've just stumbled across cgs.synth.net, and found the link to this group. I run the Crumar group, (well, Josh does most of the modding these days). I run several websites as well, including nervejam.com, my music site. Years ago, I used to buy, fix and sell old analogue gear
2010-01-25 by sasami@hotkey.net.au
>OK, the last problem turned out to be a cracked trace between pins 9 and 11 of the LM3900. Apparently, the force of cutting the lead alone cracked this trace, so I'd like to ask Ken again if this might be a result of his new PCB manufacturer, since I didn't have anything remotel
2010-01-25 by derekatumaticdotnl
OK, the last problem turned out to be a cracked trace between pins 9 and 11 of the LM3900. Apparently, the force of cutting the lead alone cracked this trace, so I'd like to ask Ken again if this might be a result of his new PCB manufacturer, since I didn't have anything remotely
2010-01-25 by derekatumaticdotnl
Hi Doug, thanks for your thoughts. --- In cgs_synth@yahoogroups.com , "Doug" wrote: > Glad you got #2 working. When you say "removing other PCBs downstream", that could indicate bad grounding practices or a multitude of other issues. Can you elaborate a bit? I had the output of t