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2013-11-03 by cg_synth
LED size is unimportant if they are not being mounted directly on a PCB with limited space (in other words, most of the time). The original version of the CGS13 had them mounted, thus the reason for the size being specified. Pick LEDs that suit your panel, or whatever bezels you
2013-11-03 by Neil Baldwin
Can't remember which LEDs I bought but I kind of did the opposite / bought clear lenses and colour LEDs - the colour is then less obvious until the LED is on. I thought it was a nice touch :) I'm pretty sure I used all 3mm though. Where are you getting these 'non 3mm' from? Neil
2013-11-03 by freq63
In the infos I collected I got: LED 2 x CGS31 13 x CGS36 1 x 8 CGS59A TOTAL: 23 LED-3mm 9 x CGS13 only!!! TOTAL: 9 I have no idea which one to buy for the "not-3mm" ones. Do you have a Mouser reference for these 23 LEDs please? Are all LEDs white and you just take lense for the c
2013-10-22 by Richard Brewster
Thanks, Ken. Suppose I patched a positive-only signal to the DC carrier input. Would there be any benefit to connecting Unbalance between ground and -VE (instead of to +VE)? On 10/22/13 6:27 AM, sasami@... wrote: > I don't think connecting to to -VE would give any real benefit. I
2013-10-22 by cg_synth
I don't think connecting to to -VE would give any real benefit. If anything it would make it harder to get it to run balanced. The derp is most likely in the setup description. Ken >The unbalance pot is between ground and +VE on the schematic. But in >setting up the directions sa
2013-10-22 by Richard Brewster
The unbalance pot is between ground and +VE on the schematic. But in setting up the directions say, "Disconnect the wiper of the unbalance pot, if fitted, or use a meter to set the voltage on it to zero." This wouldn't be necessary if you could just turn it to the ground side. So
2013-10-19 by cg_synth
Pull the 4015 chips out of the infinite melody so they don't interfere. I assume they are in sockets. Taking to logic HIGH means connecting to +VE. Taking to logic LOW means connecting to 0V. Connect a 1k resistor to the +VE rail. Connect things that need to go HIGH to that. Conn
2013-10-19 by okayjustalittle
Hi Ken I got to look at the Diatonic Converter today ; it's connected to the Infinite Melody in the BoCGS MARSH panel , would you be able to let me know how to test it as built into the MARSH panel ? I don't understand what setting inputs to high or low actually means to be hones
2013-10-18 by Stephen Richards
thanks Ken On Friday, October 18, 2013 6:50 PM, "sasami@..." wrote: With all inputs low, the output should be 0V. Set all three of the NOTE inputs to high, and adjust the Note adj. trimmer until the output is 1V. Set all inputs low, returning the the output to 0V. Set the C of th
2013-10-18 by cg_synth
With all inputs low, the output should be 0V. Set all three of the NOTE inputs to high, and adjust the Note adj. trimmer until the output is 1V. Set all inputs low, returning the the output to 0V. Set the C of the OCT inputs to high, and A and B to low and adjust the Oct adj. tri
2013-10-18 by Stephen Richards
Hi Ken and All I am catching up on as much calbrating as possible across 5 built CGS/Serge Panels. I have arrived at the Diatonic Converter. I can't see anything in the Build page , does anyone have some tips on what to do with the Octave Buffer and Note Buffer trimmers ?
2013-10-14 by cg_synth
>Would it work to run the two CV Inputs to the CV In pads then the Initial Gain pot Wiper to the CVSN pad via a 100K resistor ? Yes, that would also work. _______________________________________________________________________ Ken Stone sasami@... otherunicorn@... Modular Synth P
2013-10-14 by Stephen Richards
Thanks Ken. Yes , after i sent the last mail , i looked at the Schematic and came to a similar conclusion. Would it work to run the two CV Inputs to the CV In pads then the Initial Gain pot Wiper to the CVSN pad via a 100K resistor ? They al seem to join up at the same point in t
2013-10-14 by cg_synth
Look at the circuit diagram. From there you will see it is possible to add extra CV inputs by connecting them via an extra 100k resistor per input to the CVSN pad. Ken >Hi Ken and all > >I'm wiring the VCA on the (Dmitri) Vintage Voltron Panel #1. > >As this VCA is implemented wi
2013-10-14 by Stephen Richards
Hi Ken and all I'm wiring the VCA on the (Dmitri) Vintage Voltron Panel #1. As this VCA is implemented with 2 x CV inputs i'm not sure how to wire this. Do i just follow the Initial Gain Pot wiring on your CGS64 VCA build page and then link the two CV inputs and send them to the
2013-10-08 by freq63
Do you know where I could find an illustrator file (even a PDF maybe?) of the SWAMP panel please?
2013-10-07 by Stephen Richards
Stranger things have happened ! Thanks , Ken. On 07/10/2013, at 4:17 PM, sasami@... wrote: Maybe you had a chip in backwards? Ken >Removed the chips , put them back in one by one starting with the LM3900's , then the CA3046's. > >Now it's working !!?? > >Whatever gremlin was in t
2013-10-07 by Stephen Richards
Thanks Rick Good advice , will do. From: Richarius Molindarius To: cgs_synth@yahoogroups.com Sent: Monday, October 7, 2013 10:30 PM Subject: Re: Re: [cgs_synth] RE: CGS82 Negative Slew Reseating the chips, could also mean a cold solder joint in one of the chip sockets of the PCB.
2013-10-07 by Richarius Molindarius
Reseating the chips, could also mean a cold solder joint in one of the chip sockets of the PCB. There're too many current drains within that circuit for me to be able to suggest which of the chips that it could have been to be drawing so much current to cause the 547 to over heat
2013-10-07 by cg_synth
Maybe you had a chip in backwards? Ken >Removed the chips , put them back in one by one starting with the LM3900's , then the CA3046's. > >Now it's working !!?? > >Whatever gremlin was in the works seems to have been evicted. > >Maybe cheap IC sockets ? I couldn't get 14pin machi
2013-10-07 by Stephen Richards
Removed the chips , put them back in one by one starting with the LM3900's , then the CA3046's. Now it's working !!?? Whatever gremlin was in the works seems to have been evicted. Maybe cheap IC sockets ? I couldn't get 14pin machined sockets in time for this build. I dunno ; but
2013-10-07 by cg_synth
Find out what voltage is on the "6V" line - it's probably less than 6V. Start isolating bits of the circuit to find out what is causing the massive current drain - power rail will return to 6V when the affected circuit is disconnected. Try pulling out the chips to start with. I a
2013-10-06 by Stephen Richards
Hi Ken When the PCB is powered up , if i put my finger on the BC547 in the the 6V section. It is cool to the touch for a few seconds then becomes very hot very quickly. I have changed out all of the electrolytics and there is no change , i have looked over and over and can't find
2013-10-05 by Stephen Richards
OK thanks , i can't find a short. I'm stumped.I'll keep plugging away at it. From: "sasami@..." To: cgs_synth@yahoogroups.com Sent: Saturday, October 5, 2013 12:13 PM Subject: RE: Re: [cgs_synth] RE: CGS82 Negative Slew The links are all part of the 0V power rail. with any of the
2013-10-05 by cg_synth
The links are all part of the 0V power rail. with any of them missing, nothing was working properly. ---In cgs_synth@yahoogroups.com, wrote: Thanks Ken I've been looking for a short , will keep looking. Any clue on why it works without that link installed ? Could that be the key
2013-10-05 by Stephen Richards
Thanks Ken I've been looking for a short , will keep looking. Any clue on why it works without that link installed ? Could that be the key to tracking down this problem ? From: "sasami@..." To: cgs_synth@yahoogroups.com Sent: Saturday, October 5, 2013 9:21 AM Subject: [cgs_synth]
2013-10-04 by cg_synth
First, find where the short circuit is! The transistor should not get hot. Ken ---In cgs_synth@yahoogroups.com, wrote: Hi Ken and All I finished building the CGS82 Negative Slew. Had i 'working' , as far as i can understand it so far , but the bottom section LED was not working.
2013-10-03 by Stephen Richards
Hi Ken and All I finished building the CGS82 Negative Slew. Had i 'working' , as far as i can understand it so far , but the bottom section LED was not working. While i was trying to troubleshoot that problem , i noticed i had omitted the link that's between the RATE pads on the
2013-10-02 by freq63
I mean I want to buy the panel, not the module. It is to build my own SWAMP module with the CGS boards that I bought from Ken. ---In cgs_synth@yahoogroups.com, wrote: I would like to buy a Swamp panel. Preferably the one with the unicorn in the bottom left corner!
2013-10-01 by freq63
I would like to buy a Swamp panel. Preferably the one with the unicorn in the bottom left corner!
2013-09-28 by cg_synth
There is probably a construction error in the area of the sustain pot. perhaps the pot isn't wired to the correct pads. Perhaps you have a wrong transistor installed. C will have no effect on the sustain voltage. ---In cgs_synth@yahoogroups.com, wrote: Wonder if anybody can help
2013-09-28 by piano392003
Wonder if anybody can help with this issue. I built the CGS78, using 1Megohm pots for the attack, decay and release controls. Using ±12V Power supply. Attack and release functions work fine. Sustain control has no effect on output level voltage (Output stays at about 10.6 volts w
2013-09-09 by cg_synth
Seriously, the PSU won't even notice a 1M load. Connect a couple of 12V lamps to it or something like that. It should NOT drift once calibrated with a real load. Under no-load conditions they are unstable. --- In cgs_synth@yahoogroups.com, wrote: Hi, I recently built the CGS66 PS
2013-09-09 by tysseng
Hi, I recently built the CGS66 PSU, but I am observing a (to me) strange behaviour when measuring the output voltages. I calibrated the output to +/- 15V without any load connected. Then, after the PSU had been turned off for a few days, I connected a load consisting of two 1M re
2013-09-05 by Dmitri SFC
BEWARE! The red & black wires are reversed ! if you buy them its a good idea to swap the red & black cables right when you get them in order to not forget & plug modules in backwards. I fried a bunch of lm3900 with those. d --
2013-09-05 by zathrus1
Disregard my message - it looks like the URL got messed up in the process of making it into an email. Not sure why.... --- In cgs_synth@yahoogroups.com, wrote: The URL seems to be messed up for that - Try this instead http://www.allelectronics.com/make-a-store/item/CON-234/4-PIN-
2013-09-05 by Gary Stone
The URL seems to be messed up for that - Try this instead http://www.allelectronics.com/make-a-store/item/CON-234/4-PIN-CONNECTOR-W/HEADER-0.156/1.html Gary
2013-09-05 by David Woof
I've been using these for quite a while - they make the job so much quicker! In Europe I get them from Banzai.
2013-09-04 by spgjmf
hi folks, been building cgs for 10 years and just found these http://www.allelectronics.com/make-a-store/item/CON-234/4-PIN-CONNECTOR-W/HEADER-0.156/1.html might be useful to new build. adding a few modules in the coming months ... so I'll be back with questions... best, Jeff
2013-09-03 by jean0bender
Ok, i've got it working. I had troubles with my transistor pair & the span trimmer... Well, i just need now to tune it. thanks for the help.. --- In cgs_synth@yahoogroups.com , cgs_synth@yahoogroups.com > wrote: Sine is always going to sound quieter. It doesn't have all the harmo
2013-09-03 by cg_synth
Sine is always going to sound quieter. It doesn't have all the harmonics. Reducing the 330k connected to pin 12 of the 3900 may help increase the volume. It may also cause distortion. +/-15 is correct. It's an old diagram. Ken --- In cgs_synth@yahoogroups.com , cgs_synth@yahoogro
2013-09-03 by jean0bender
Ok Ken, thanks for the answer. Is it normal if the sine output is not so loud as the other outputs ? I'm powering the vco via +/-15v. Maybe i should change some resistors to fix that ? I've seen the schematic uses +/-12v. If not, what should i check ? Changing the two 100K resist
2013-09-02 by cg_synth
Square out is a different issue altogether. No square out happens when the PWM voltage is outside the range covered by the sawtooth. The CV issue is a problem somewhere in your input mixer, where you seem to have excessive gain. --- In cgs_synth@yahoogroups.com , cgs_synth@yahoog
2013-09-02 by jean0bender
yep, i didn't forget it. The fact is i can see on my scope the saw out, the sine one, but i can't have square out. Tomorrow i'll desolder all the pots & out, and change my transistors & tempco... we'll see what happens ! --- In cgs_synth@yahoogroups.com , cgs_synth@yahoogroups.co
2013-09-02 by jean0bender
yep, i didn't forget it. The fact is i can see on my scope the saw out, the sine one, but i can't have square out. Tomorrow i'll desolder all the pots & out, and change my transistors & tempco... we'll see what happens ! --- In cgs_synth@yahoogroups.com , cgs_synth@yahoogroups.co
2013-09-02 by Ove Ridé
Have you fitted the 1k tempco resistor (or a regular 1k resistor in its place)? When I built a similar VCO using discrete transistors instead of an LM394, I forgot to place this resistor, and the oscillator didn't work. This is the resistor that is supposed to sit over the LM394
2013-09-02 by jean0bender
Well, here are my test. Seems to be a bit weird. I've multimetered my ics when my pots where center positionned i can see that if i approach my fingers to the pots or some parts it's altering the sound... I've rechecked all my links & solders... IC1 / TLO72 1 : -1,55v 2 : 0 3 : 0
2013-09-02 by jean0bender
Well, thanks for your answer Ken... I think my problem is somewhere else, but can't see where. If i use my sequencer on the vc fm, i can modulate the vco. If i apply the same cv output to the cv in, my vco doesn"t respond. If i apply the cv output to the 1v/o in, nothing. If i ap
2013-09-02 by cg_synth
If the span trimmer is not right, the VCO may be too sensitive to CV and to the tuning pot. Ken >Hi Everybody ! That's my first post here, as after building several modules, i think i've got some problems to fix on my cgs48. I've used a 2N3904 matched pair instead of the LM394. I
2013-09-02 by jean0bender
Hi Everybody ! That's my first post here, as after building several modules, i think i've got some problems to fix on my cgs48. I've used a 2N3904 matched pair instead of the LM394. I think that my vco is working, but i can't really use the initial freq pot. It must be always in