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2013-08-25 by cg_synth
The chip should make no difference. TL072 and LF353 are often marketed as the same device (despite their minor differences). You may have lifted a pad when soldering, or have some other part incorrectly installed - perhaps a wrong value resistor or something. Ken >Upon turning on
2013-08-23 by spunraddish
Upon turning on, None of the signals show response. Until I fiddle around with the TL072 (353 substitution) in socket, it doesn't work. Finally taking an LFO to the input seems to work, though as I turn the rise knob 5 cents the signal dies. The fall knob shows no response. As I
2013-08-14 by Dmitri SFC
My 5k trimmer wasnt doing anything, The ASR was just kicking out some high negative voltage & wasnt of much use with my VCOs/ would just make them wine. Processor on the ASR input makes it usable. I matched the resisters & used the ICs noted to work on the page. d http://www.face
2013-08-14 by cg_synth
I've seen a couple original Serge filters with the 22M omitted. They just apply a hint of bias to the OTAs. I think they are there to stop the filter closing up completely at the lowest end of its range. The other two resistors can be left there. Ken >Hi Ken > >I'm building some
2013-08-13 by Stephen Richards
Hi Ken I'm building some more of these for my 70's Serge (dmitri) panels. I don't have 22M resistors this time , what is the general opinion about omitting them ? Do i have to remove the 100K and 15K as well or can they stay in ? (They are already installed). [Non-text portions o
2013-08-13 by Richard Brewster
It sounds like you use the CGS81 to scale the input to the ASR. What problem does that solve? I don't see why you would do that, since the ASR has a trim pot for scaling its input already. I have two ASRs, and the main issue I have with them is that the transfer from input to out
2013-08-12 by meech
I know Ken discontinued this one because people found it difficult to build. This is just a tip for those who have the board & have not yet built it or never felt it worked right for them. Snap a CGS81 DVP board in half and wire a voltage processor to the input, Wire the input po
2013-08-07 by jaswkah
hi ken thanks for your reply. i will go through the board and see what the problem is. best regards jason
2013-08-06 by cg_synth
you have a constuction error/short circuit somewhere. Ken >hello again > >i've managed to wire everything up but now the 10R resistor (bead) situated right behind where the power cable is connected is burning up. > >i tried to switching out the resistor for another one but the sa
2013-08-06 by jaswkah
hello again i've managed to wire everything up but now the 10R resistor (bead) situated right behind where the power cable is connected is burning up. i tried to switching out the resistor for another one but the same thing happened. i'm trying to run the module on a 12V doepfer
2013-08-06 by jaswkah
hi ken thanks so much for your help and speedy reply. all the best jason
2013-08-05 by cg_synth
>i want to wire switched 3.5 mm jacks to the digital noise board. > >for the speed pot can i just wire from its ground terminal to the ground terminal of the cv input jack and then wire this to ground in the board? Yes. >and the output of the pot (cw) to the tip of the cv input j
2013-08-05 by jaswkah
hello i want to wire switched 3.5 mm jacks to the digital noise board. for the speed pot can i just wire from its ground terminal to the ground terminal of the cv input jack and then wire this to ground in the board? and the output of the pot (cw) to the tip of the cv input jack?
2013-08-03 by ghpicard
--- In cgs_synth@yahoogroups.com , Stephen Richards wrote: > 33K# x 2 (Window size CV and Hold Input) They are pull down resistors. >22K# x 2 (Duration pot CW and CCW) They are part of two voltage dividers that feed the + and - inputs of a summing amplifier (the LM3900). They mus
2013-08-03 by kevin siegenthaler
Good work! keep it up. K ________________________________ From: Dmitri SFC dankedout415@... > To: cgs_synth@yahoogroups.com Sent: Saturday, August 3, 2013 10:01 AM Subject: [cgs_synth] Re: CGS76 Serge 1973 Env Gen question I populate 73EG per the solder mask with all 100k pots &
2013-08-03 by Dmitri SFC
I populate 73EG per the solder mask with all 100k pots & it works great. d -- http://www.facebook.com/dmitri.sfc > [Non-text portions of this message have been removed]
2013-08-03 by Stephen Richards
Thanks Ken ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Saturday, August 3, 2013 9:44 PM Subject: Re: [cgs_synth] CGS76 Serge 1973 Env Gen question >Hi Ken and all > >I'm building up the OCB for the Serge 1973 Env Gen. > >
2013-08-03 by cg_synth
>Hi Ken and all > >I'm building up the OCB for the Serge 1973 Env Gen. > >There are three resistor i'm unclear on. > >33K# x 2 (Window size CV and Hold Input) , 22K# x 2 (Duration pot CW and CCW) and the 2.2K and 1.8K in the 6V regulator section. >I'm assuming the 22K's are there
2013-08-03 by Stephen Richards
Hi Ken and all I'm building up the OCB for the Serge 1973 Env Gen. There are three resistor i'm unclear on. 33K# x 2 (Window size CV and Hold Input) , 22K# x 2 (Duration pot CW and CCW) and the 2.2K and 1.8K in the 6V regulator section. I'm assuming the 22K's are there if you are
2013-07-31 by Dmitri SFC
I built one, it works fine without any switch, mine has a 100k in line with the wiper of the VC pot d -- http://www.facebook.com/dmitri.sfc > [Non-text portions of this message have been removed]
2013-07-30 by tojpeters
Ok,thanks. Doesn't seem like many people have actually built any yet. People are still waiting for panels. I got mine used from someone who abandoned their build. working on the swamp panel now. waiting for a mouser order for those inevitable last few bits not in my stock. --- In
2013-07-29 by cg_synth
It would probably be an idea to ask on the best of CGS build thread over on muffwigglers to see what others have done. Ken >This is for a BOG panel. Would you recommend the 22k or just using a push-pull pot in place of the normalized jack? Thanks for your reply. > >--- In cgs_syn
2013-07-29 by tojpeters
This is for a BOG panel. Would you recommend the 22k or just using a push-pull pot in place of the normalized jack? Thanks for your reply. --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > I think if you go to 100k you will limit the range of the pot too much when > there
2013-07-28 by cg_synth
I think if you go to 100k you will limit the range of the pot too much when there is nothing plugged in. I try it with a 22k pull up. Ken >Can I change the pull-up resistor from 1K to 100K rather than a switched jack for banana jack CV input? Or do I need to use a separate switch
2013-07-28 by tojpeters
Can I change the pull-up resistor from 1K to 100K rather than a switched jack for banana jack CV input? Or do I need to use a separate switch?
2013-07-28 by Dave Pitchless
Hello folks, I posted this over at Electro Music but didn't get any replies so I'm trying here as well. The original post with picture is here: http://electro-music.com/forum/topic-57687.html Basically I am mounting my CGS29 to my custom designed panel which includes a Boost swit
2013-07-25 by Romeo Fahl
The psycho-LFO is very cool. I second that recommendation. On Thu, Jul 25, 2013 at 3:01 PM, r fluxmonk@... > wrote: > ** > > > nice selection of modules! i'd want more in the way of oddball modulation, > like maybe a gated comparator, or dual psychoLFO > > --- In cgs_synth@yahoog
2013-07-25 by r
nice selection of modules! i'd want more in the way of oddball modulation, like maybe a gated comparator, or dual psychoLFO --- In cgs_synth@yahoogroups.com , "ALFREDO" wrote: > > Thanks for you answer r, my rig : > -CGS48 VCO X2 > -CGS58 UTILITYLFO X2 > -CGS65 TUBE VCA X2 > -CGS
2013-07-25 by Richard Brewster
How about CGS92, Serge Smooth and Stepped Generator or CGS113, Serge Wave Multipliers, if these would fit your panel space. They both have a lot of panel features. Richard Brewster http://pugix.com On 7/24/13 4:54 PM, ALFREDO wrote: > Thanks for you answer r, my rig : > -CGS48 VC
2013-07-25 by cg_synth
Suggestions: DC mixer VCA They may seem to be boring choices, but you can never have enough of them. --- In cgs_synth@yahoogroups.com , "ALFREDO" wrote: > > Thanks for you answer r, my rig : > -CGS48 VCO X2 > -CGS58 UTILITYLFO X2 > -CGS65 TUBE VCA X2 > -CGS04 DCMIXER X2 > -CGS29
2013-07-24 by ALFREDO
Thanks for you answer r, my rig : -CGS48 VCO X2 -CGS58 UTILITYLFO X2 -CGS65 TUBE VCA X2 -CGS04 DCMIXER X2 -CGS29 WAVEMULT X1 -CGS74 VCS X1 -CGSrr RRINGMOD X2 -CGS35 SYNTHACON X1 -CGS JOYSTICK X1 -CGS60 STOMPBOXAD X2 -MFOS VCF X1 -MFOS NOISE X1 -MFOS SAMPLEHOLD X1 -MFOS VCA X1 -MF
2013-07-22 by Stephen Richards
Thanks Ken I'll update my B.O.M. ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Tuesday, July 23, 2013 9:22 AM Subject: Re: [cgs_synth] CGS76 Env Generator build question As long as the pins are in the right holes, it will b
2013-07-22 by cg_synth
As long as the pins are in the right holes, it will be fine. Small signal Transistors are not as critical as people think. A BC557 would work fine there for example. I note that in the text. Ken >Hi Ken and all > >Could anyone tell me if i can use an old fairchild 2n3638A instead
2013-07-22 by Stephen Richards
Hi Ken and all Could anyone tell me if i can use an old fairchild 2n3638A instead of a 2n3638 in the CGS76 Env Generator ? [Non-text portions of this message have been removed]
2013-07-22 by r
hard to say w/out knowing what other modules you have in your rig... but a pair of CGS30 bandbpass filters would fit nicely in that space, and would be a good complement to the wavefolder. underrated module, imo. b --- In cgs_synth@yahoogroups.com , "ALFREDO" wrote: > > Hello Mat
2013-07-22 by Nikmis Nikmis
If I were you, I would start by checking the resistor values of R23, 24, 25, 26, 27, 28 and the orientation of diode 3 and 4. Look for bad solder joints in that region, too. Maybe you put an 820k resistor instead of a 82k resistor for R27 or something On Mon, Jul 22, 2013 at 6:43
2013-07-22 by Nikmis Nikmis
I couldn't tell you what the problem is, but I can confirm that you have one. With sustain at maximum, decay shouldn't even register. [Non-text portions of this message have been removed]
2013-07-22 by cg_synth
I don't know what is going on off hand. no one else has mentioned having problems. I do not currently have one in my system, so I can't comment on normal behavior or not. Ken >*bump* anyone want to take a stab at this? could you at least tell me if it is normal or not? i also rec
2013-07-21 by ALFREDO
Hello Mates, please I need some help to choose one more module to full up My euro front pannel ala muffwigler Best Of CGS panels, with some space empty, actually I have one VCS and one WAVEMULTIPLIER, I have also a CGS65 tube vca but I think is better to get this in a independent
2013-07-21 by Elan
*bump* anyone want to take a stab at this? could you at least tell me if it is normal or not? i also recently discovered that inputting a DC offset voltage into the sustain CV gets it to be pretty high, but obviously I'd like to set the sustain amount with my knob... could it be
2013-07-21 by ALFREDO
Hello Ken, thanks for you help, the problem was afew bad joint. Now my wavemultiplier is working propelly. * --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > > You have a construction error somewhere. Either there is a solder bridge > shorting out the signal, or there is
2013-07-18 by woof_dave
Thanks Ken, much appreciated. Dave. --- In cgs_synth@yahoogroups.com , "cg_synth" wrote: > > The 2N3819 is a symmetrical FET. source and drain are interchangeable. > > Ken > > --- In cgs_synth@yahoogroups.com , "woof_dave" wrote: > > > > Just stuffing my boards, and I noticed the
2013-07-17 by cg_synth
The 2N3819 is a symmetrical FET. source and drain are interchangeable. Ken --- In cgs_synth@yahoogroups.com , "woof_dave" wrote: > > Just stuffing my boards, and I noticed the PCB marking for the source and drain of the 2N3819 is reversed from what I see on my Fairchild 2N3819: >
2013-07-17 by woof_dave
Just stuffing my boards, and I noticed the PCB marking for the source and drain of the 2N3819 is reversed from what I see on my Fairchild 2N3819: http://www.ee.buffalo.edu/courses/elab/2N3819.pdf ...so I'm not clear now which way round this should go... If I mount it matching the
2013-07-16 by cg_synth
You have a construction error somewhere. Either there is a solder bridge shorting out the signal, or there is a bad joint or break where you have applied too much heat soldering. Have a good look at the bottom of the board. Ken >Hello, please I need some help. >I have build that
2013-07-16 by ALFREDO
Hello, please I need some help. I have build that module and half is not working, the GRINDER and LOCKHART works ok, the FOLDS, OFFSET and PWM doesn't do nothing. I purchase the components kit from Elby Designs so I don´t think I make a mistake placing components values. I wiring
2013-07-15 by Elan
I made a thread at electro-music here: http://electro-music.com/forum/topic-58896.html still waiting for a response. Basically the sustain portion of the envelope seems very low in voltage compared to how high the voltage can reach during the decay phase. Any ideas? Thanks! -Elan
2013-07-11 by Dmitri SFC
uh yes im a freak !! When using the lower half of SSG as Suqare wave VCO you mult out of the Cycle & In jacks to get the Square ! (Not the stepped out !) & The new lay out with the bi-polar LED drivers is working great! Thank you Ken!! D -- http://www.facebook.com/dmitri.sfc http
2013-07-11 by Dmitri SFC
Thank you . i tried shorting the 330r. , tried changing values of the 33k , no luck. It samples beautifully with the jumper in & cycles great with jumper out. Seems to be stuck holding when i patch it to cycle with the jumper in. I used a BC557 backwards to the footprint. d -- ht
2013-07-10 by cg_synth
try shorting out the 330R resistor at pad S. (and looking for construction errors) Ken >New lay out. wont go up into audio range when S to L jumper is in. >cut the jumper & they cycle as VCOs/ no problem. Any recommendations ? >Change the 33k & 15k resistors near the L pad ??? >t