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2014-06-01 by Stephen Richards
Ended up being the TL072 on the output. I also installed 1K in place of the 4.7K in the resonance path for extra juice. On Thursday, May 29, 2014 1:24 AM, "Dmitri SFC dankedout415@... [cgs_synth]" wrote: pot value too big ? d --
2014-05-28 by Dmitri SFC
pot value too big ? d --
2014-05-28 by Stevie Richards
Hi Ken I've been troubleshooting my 5 Band pass array on my COA VV4 panel. On the lowest BPF the influence of the Freq pot only kicks in at the last few mm of pot travel towards CW. I've beeped out the connections for both pots , they are correct. Could this be a blown TL072 caus
2014-05-14 by djstorm
Hi, I'm getting a really low volume at the mix output on the cgs90 phaser. The signals seem normal until after the 68k resistors on the mix section, which leads me to believe that the op amp should be providing some extra gain that it's not in my case. Everything appears to be so
2014-05-05 by sirolffoonav
Dear group, I've got two questions: -How can I make the AEP trigger from the Programmer/sequencer higher or wider? This signal goes to a Low Pass Gate CV in, but can't totally open it. -How do I connect LED's to the outputs of the Programmer/sequencer? To make a simple vactrol pa
2014-04-30 by Brian Birge
Re: Serge Res Eq troubleshoot Hey thanks! It wasn't a pot wired wrong but it was a grounding issue, I am using bare wire for the ground bus among the pots and some slack was too close to the wipers on a couple pots. All sorted, sounds great!
2014-04-30 by cg_synth
Did you ground it to the right side of the input jack? If you grounded it to the signal pin, behavior would have been weird! The fact the the normal frequency pot works indicates the filter itself is fine, because all the pot is doing is injecting a voltage into an identical inpu
2014-04-30 by a150843860494e6535edad55d0c7983d
Hi, got the cgs35 all built up and working fine until I decided to add a cv input. connected a mono 1/4" jack with hot to a CV pad and the other gronded to the input jack tried injecting a couple of different types of voltage (4017 sequencer, LFO & expression pedal) and none of t
2014-04-29 by cg_synth
Sounds like you have wired one end of the pots to earth instead of the proper pad.
2014-04-29 by Brian Birge
Hey all, I've just built 4 of the serge resonant eq's. 2 of them work perfectly but the other two each have two bands next to each other (different for each board) that don't do any cut or boost until the very end of the pot travel at which point they short out the signal. I have
2014-04-28 by oojimentis
Thanks for swift reply. (I have the old version of the board) I checked out all the diodes and they appear to be ok and double checked the 470R and 4k7 resistors around IC5B - those are correct too (I was hoping that I got them mixed up ;-) ) You've certainly given me an idea of
2014-04-27 by cg_synth
Something is certainly wrong. The pots themselves are not used in such a way that crackles and pops would be expected. You probably have a construction error somewhere that is allowing too much gain at one stage, causing it to clip. Make sure the diodes and 470R around pins 6-7 o
2014-04-27 by oojimentis
Hi, I have an older version of this module and it's never really sounded right. All of the pots make crackling noises and pops when turned, making the module not very useful. I don't think it's a batch of bad pots as it still makes noise when controlled from a LFO when the modula
2014-03-23 by Jason Nanna
The span trim resistor should stay 4.7k. The goal for that trimmer is to dial in a resistance equal to the ~10k feedback resistor in the adjacent op-amp (unity gain output). Of course, if you don't match the other two 10k resistors in the other inverter to that first 10k, you can
2014-03-23 by Stephen Richards
Hi Ken I need to covert my Analog Logic (and the rest of my BoCGS Panel B modules) to 12V. Im just going through the build pages for each one. On the Analog Logic the advice for 12V is to change the 4K7's in the Resistor networks to 2K2's. Is it just the 4K7's coming of the base
2014-03-16 by cg_synth
Just cut off the un-needed pins. The board was designed for sockets that only had 2 pins installed.
2014-03-16 by goeran stangeland
Hi, probably a stupid question, but i have trouble mounting the 4 sockets on the cgs33eus_a board. 3 of them seems to fit but the fourth does not. Only two of the legs fits the holes in the board. Do i only use the two legs on the socket? The same seems to be the case for the cgs
2014-03-09 by antoni_capelli
i did it, thanks! the offset was moving up & down, now it's fixed to zero; and i'm able to boost the gain if needed: perfect! don't know if it's me, but i had a trace issue on both circuits between the crossing: 82K (not the K side) and 47K leading to 3904; thanks again anthony
2014-03-07 by cg_synth
Is Q1 at the chip itself always 0? If yes, you really do have a short. If it works there, you have a broken track or bad joint between the chip and the rest of the circuity. Make sure you have the correct version of the chip in there too, not a 74HC version. >Hello > >I built the
2014-03-07 by eric Dtreize
Hello I built the module. But it have some problems I dont understand. Output 1B as the same frequency as the clock input Output 1D is not(IB) Output 2C is 0 Output 2A is on So it seems the Q1 (pin 12) output of the 4024 is always 0. I changed the 4024 : always same behaviour. I
2014-03-06 by Loscha
Thanks, Ken. That answers exactly what I wanted to know about the circuit. I'm not really going to be using it for "Precision" work, so uber stability is not required. Regards; ///Edward On Thu, Mar 6, 2014 at 10:41 PM, sasami@... > wrote: The diodes don't change the waveform - j
2014-03-06 by cg_synth
The diodes don't change the waveform - just the CV response/range. Ken >Hi All, > > OK, so, I've got 2 Synthacon Boards, Rev 1. > >Apart from the Extra diodes, and the additional offset trimmer, they seem >pretty similar. > >It should be quite doable to add the extra 2 diodes, an
2014-03-06 by Loscha
Hi All, OK, so, I've got 2 Synthacon Boards, Rev 1. Apart from the Extra diodes, and the additional offset trimmer, they seem pretty similar. It should be quite doable to add the extra 2 diodes, and I don't need the trimmer on it. Has anyone else made up the V1 as a VLater board
2014-03-03 by cg_synth
Yes, that's the 2.2 board. Build it as is. Ken >Hello > >I want to build the CGS22 master divider. >So I'm checkin the board. >My board is writen CGS22 ver2.2 on the componant side >and CGS22 ver 2.1 on the soldering side. > >My problem is that I only see 9 smt capacitor sites. >
2014-03-03 by eric Dtreize
Hello I want to build the CGS22 master divider. So I'm checkin the board. My board is writen CGS22 ver2.2 on the componant side and CGS22 ver 2.1 on the soldering side. My problem is that I only see 9 smt capacitor sites. The difference seems to be in the -15 V corner (lower left
2014-03-02 by cg_synth
>Yeeeah! > > im almost done with the Bog! and it's a lot of fun to play with; just get into more accurate calibration now. > > > i did the -5/+5v mod for the VCOs, and straight to the vca i have 2vpp max at the output, i've used a ls312 for the dualNPN, " > > > cv init: OK /silen
2014-03-02 by antoni_capelli
Yeeeah! im almost done with the Bog! and it's a lot of fun to play with; just get into more accurate calibration now. i did the -5/+5v mod for the VCOs, and straight to the vca i have 2vpp max at the output, i've used a ls312 for the dualNPN, " cv init: OK /silence offset and cvr
2014-02-21 by Loscha
Am ordering waay too many 2n2222s from eBay to make up this and a few other things. If I do get around to messing about with it, I'll probably take frequency vs input voltage readings. if so, I'll share with the group. All the best /Edward On Sat, Feb 22, 2014 at 7:42 AM, sasami@
2014-02-21 by cg_synth
Maybe matching them would help. Other than that, who knows? Some people think using different transistors does change it, but it is a very long time since I've done any comparisons. Ken >Hi Ken & All, > > >I'm going to make up a few CGS35 synths on boards. Would matching the >2n2
2014-02-21 by Loscha
Hi Ken & All, I'm going to make up a few CGS35 synths on boards. Would matching the 2n2222s or Diodes make a lick of difference in the "purity" of the filter? /Edward
2014-01-31 by anthony_dematteo
Got it going.I noticed the same voltage fluctuations happening again and switched out the 3900 and presto all is good. Thanks again Ken for all your help. YOU ARE AWESOME!
2014-01-31 by anthony_dematteo
Ok so i got the junction at the regulator section giving me 1.4v now, i replaced the 10k i had subbed back w/ the 8.2k that is supposed to be there originally,but still functioning the same. Begging for any other ideas/suggestions
2014-01-30 by anthony_dematteo
Ok makes sense.Gotta call it a night but want to thank you so much for all the help! I'm feeling much closer to getting this working.
2014-01-30 by cg_synth
>Ok so things have changed.I noticed the pnp case was melted a little so swapped it out and am now getting -.061 at the junction. >Another exciting development is now when i probe pin 10 i can get it to function correctly.I tried with a small screw driver to see if it was a bad c
2014-01-30 by anthony_dematteo
Ok so things have changed.I noticed the pnp case was melted a little so swapped it out and am now getting -.061 at the junction. Another exciting development is now when i probe pin 10 i can get it to function correctly.I tried with a small screw driver to see if it was a bad con
2014-01-30 by cg_synth
>I'm getting 5.4 Too high. Should be around 1-2 V. The pull down isn't correct, or isn't in circuit. > > > > > > > > >/* start of attachment style */ > .ygrp-photo-title{ > clear: both; > font-size: smaller; > height: 15px; > overflow: hidden; > text-align: center; > width: 75px;
2014-01-30 by anthony_dematteo
I'm getting 5.4v.
2014-01-30 by cg_synth
>The thing that's throwing me for a loop is i'm not getting any change in voltage off pin 10 of the 3900.I'm assuming i should be seeing the voltage i'm feeding that pulse input and able to see pin 10 go high and lo Yes, you should be able to see that. They are just being used as
2014-01-30 by anthony_dematteo
Well swapping the 3900 did stop the fluctuations but still no dice and i've swapped out about 10 different 4007's from 2 different batches. The thing that's throwing me for a loop is i'm not getting any change in voltage off pin 10 of the 3900.I'm assuming i should be seeing the
2014-01-30 by cg_synth
Swap the 3900. If you still get fluctuations, swap out each 4007 (or pull them, and put them back in one at a time). >Seem to be getting correct voltge on all ic's +6 to pin 14 / -5.6 to pin 7 but i do notice the positive rail is swinging up and down about 1v.This is only with 2
2014-01-30 by anthony_dematteo
Seem to be getting correct voltge on all ic's +6 to pin 14 / -5.6 to pin 7 but i do notice the positive rail is swinging up and down about 1v.This is only with 2 voltage sources plugged into a1,a2 no gate. When i plug a gate in the first section i notice pin 3 and 6 of u3 go from
2014-01-29 by cg_synth
When things get unexpectedly mixed, check your power rails. Follow them right through to the pins of the chips, particularly the 4007s. Ken >Hi guys, I'm having some issues with this circuit and i'm out of troubleshooting ideas. >I've wired this up as a triple bi directional swit
2014-01-29 by anthony_dematteo
Hi guys, I'm having some issues with this circuit and i'm out of troubleshooting ideas. I've wired this up as a triple bi directional switch. I'm getting 12.5v into the lm3900 and +/-6v out.I've checked all the wiring,traces,values and have also tried swapping all of the chips an
2014-01-21 by cg_synth
>HI I got a VCS here that stops cycling when the fall pot is turned past a certain point. did the value changes on the web page & schematic but still the same behavior. Any suggestions? The guy who bui8lt it used some overly nice caps for the 47pfs'. Difficult to read but i think
2014-01-21 by babyd_lhp
HI I got a VCS here that stops cycling when the fall pot is turned past a certain point. did the value changes on the web page & schematic but still the same behavior. Any suggestions? The guy who bui8lt it used some overly nice caps for the 47pfs'. Difficult to read but i think
2014-01-11 by zathrus1
Thanks Ken!
2014-01-10 by cg_synth
> 1) In the section that says "Suggest value changes from Peter" - Do we install both the link AND the 68k resistor? They're in different colors in the drawing, so I wasn't sure if they were different options, or if both need to be installed. Also - is there any indication what t
2014-01-10 by zathrus1
Hi Ken, I'm building the LPG, and had a couple of questions. 1) In the section that says "Suggest value changes from Peter" - Do we install both the link AND the 68k resistor? They're in different colors in the drawing, so I wasn't sure if they were different options, or if both
2014-01-05 by oivind60
Thanks again Ken. Helpful as always. I hope to finish coa panel 1 this month. Cheers from Øivind, Norway
2014-01-05 by cg_synth
>Thanks for the quick reply. > I say CGS75 in the topic. My mistake. It is of course the CGS76 > One more question: Notes says if I run this on 15V I shall replace the marked 1K8 resistor with a 2K7 resistor. What about the 2K2 resistor. This resistor also have a * on the pcb No