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2017-02-02 by phijel
Thanks Ken. Oh yes, I just checked and indeed the one I built gives me a +/-5 V offset, but strangely when I simulate the circuit on iCircuit I have +/-15v after the 270k resistor. Probably user error on my side, not really familiar with this program.
2017-02-02 by phijel
btw, (and sorry for the noob question - it's for my education) isn't one of the resistor in a voltage divider supposed to be connected to ground ? Doesn't seem to be the case here...
2017-02-02 by phijel
Hi Ken, thanks Oh indeed, I just checked on the one I built and I have a +/- 5v offset, but strangely when I emulate the circuit on iCircuit I have +/-15V after the 270K resistor. probably user error on my side, not really familiar with this program...
2017-01-31 by Ken Stone
The 270k was chosen to give that ratio. It forms part of a divider with the 100k feedback resistor. Increase the 270k to reduce the amount of offset. On Wed, Feb 1, 2017 at 1:28 AM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: another small question related to that
2017-01-31 by phijel
another small question related to that, if I want the offset being -5/+5v instead of -15/+15v, can I simply add a voltage divider between the offset pot and the 270K resistor ? When simulating the circuit, I found out that a 100k/62k pair seems to do the trick, but is there a bet
2017-01-24 by richs19
Eureka! Thanks Ken. It seems like the LM3080 chips which I purchased from Small Bear Electronics in the US work just fine but the CA3080 chips which I purchased on Ebay from China don’t work. That’s confirmed as I tried them in the working version of the CGS49 and they exhibited
2017-01-24 by Ken Stone
Swap your 3080s with chips from a working filter. On Tue, Jan 24, 2017 at 5:05 AM, richs19@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I've built a few of these modules but this one seems to be giving me an interesting problem; When I run an oscillator into Filter 1 it's s
2017-01-23 by richs19
I've built a few of these modules but this one seems to be giving me an interesting problem; When I run an oscillator into Filter 1 it's sound comes out the High Pass and Notch filters loud and clear but when I switch to Low Pass or Band Pass the volume decreases sharply. Further
2017-01-18 by Ken Stone
Either-or. If it works, leave it as is. On Thu, Jan 19, 2017 at 9:51 AM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: thanks Ken (it's 15V in fact) In the meantime I also tried the solution I proposed above and it works fine too. Is one better than the other ? -- K
2017-01-18 by phijel
thanks Ken (it's 15V in fact) In the meantime I also tried the solution I proposed above and it works fine too. Is one better than the other ?
2017-01-18 by Ken Stone
Put a second pot in parallel with the existing processor pot, and wire it's wiper to +12 via a 270k resistor. On Thu, Jan 19, 2017 at 7:04 AM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: oops I meant not going to PR2 but to the PCW tab or to the 1rst inverting inp
2017-01-18 by phijel
oops I meant not going to PR2 but to the PCW tab or to the 1rst inverting input of the TL072 (pin 2)
2017-01-18 by phijel
Hello I just successfully built 3 X CGS75 in modcan A format including the processor part. And they're working great ! So I'm wondering if want to add an offset pot on the processor (only thing missing in this circuit IMHO) can I simply reproduce the CGS81 schematic using a 100K
2016-12-31 by soundbyarcone@gmail.com
How's it going? I am having a few issues with the Seq Switches in the panel. I should probably note that I am running on 15V. I had fully built the 3 CGS28 modules and when I wired them up only one was working. I swapped the chips from the working one to the non-working ones and
2016-12-27 by Ken Stone
It would seem you have a problem elsewhere. What voltages are the TL074 outputting in the high and low states? You aren't using 74xx4015 etc, are you? On Wed, Dec 28, 2016 at 5:26 AM, soundbyarcone@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I got a shipment of different T
2016-12-27 by soundbyarcone@gmail.com
I got a shipment of different TLO74's and tried about 20 of them in the Sequential Switch circuit and none of them worked. Most of them I tried and couldn't even get the LED's to light up. I couple would light up the LED's but would not step or count when receiving clock. So far
2016-12-22 by soundbyarcone@gmail.com
Okay Awesome! I swapped ground for VE- on the VCC- on the TL074 and the buffers work great. Thanks again for your help on this! I have some more TL074's on the way so I'll swap some of those out in the switches and let you know how it goes with not wanting to reset in the UP dire
2016-12-22 by Ken Stone
TL074 Pin 11 (-VCC) goes to -ve. The voltage that you read on the wiper of the pot should be present on the output of the buffer also. If not, you may have some seriously weird TL074 chips - or a power supply issue. Maybe add a resistor between the wiper and the +in for each buff
2016-12-22 by soundbyarcone@gmail.com
Okay, I wired up some TL074's as a buffer. I connected the +VCC pins on the TL074's to the +VE out on the Seq Switch PCB. I connected the -VCC pin on the TL074's to ground. (Should this go to the -VE out on the Seq Switch board?) I connected the pot wiper to the +IN on one of the
2016-12-21 by Ken Stone
LM324 is designed for single rail use, so that will help, but it is a slower chip, which in some circumstances, causes issues with CMOS counters. Neither 4017 or 4015 work with them. Your mileage may vary with other chip types. On Thu, Dec 22, 2016 at 1:54 AM, mount shasta tojpet
2016-12-21 by mount shasta
I've had success with substituting LM 324 for the TL074. Also the STMicroeletronics TL074 seems to work better than the Texas Instruments version.
2016-12-21 by soundbyarcone@gmail.com
Sounds good. I'll perf board up a few buffers and let you know how it goes.
2016-12-21 by cg_synth
You will get droop no matter what value resistors you use. Some buffering will be needed. You can use op-amps wired as voltage followers. For each stage/op-amp, connect the - input of the op-amp to the output of the op-amp. Connect the + input of the op-amp to the wiper of the po
2016-12-21 by soundbyarcone@gmail.com
I am using beads on the power inputs. As per your advice I ordered a different batch of TLO74's so I'm going to try that and see if that does the trick. I am currently using the 100k resistor and 100 k pot without the switch and wired as per the schematic on the website. Would I
2016-12-21 by cg_synth
If you are using 22R instead of beads on the power inputs, replace them with beads. You will get a high voltage on the up/down input with nothing connected to it, and the up/down switch turned on. Do not be concerned, as this voltage is passing through 62k of resistance. Any outp
2016-12-21 by soundbyarcone@gmail.com
I actually came here for the same reason. I am having the same issue with the CGS 28 modules on the Canon Engine. I am running on 15V. At first I was having issues with only one of the 3 CGS 28 modules working. I swapped the chips from the working module to the non-working ones a
2016-10-17 by shoskins99
Hi Everyone, Hoping someone could give me so thoughts / ideas to try. I have successfully built, tested and am running 3 x of the CGS28 board using 15v per Ken's page. They are in the COA Cannon Engine panel. I have tested the entire design on 12v and it appears too function perf
2016-07-22 by Ken Stone
Yes, that zener is on an output, and was a poorly thought-out modification. My version addresses that weakness by protecting the zener with a resistor. On Fri, Jul 22, 2016 at 7:38 PM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Thanks Ken, good to know (I remembe
2016-07-22 by phijel
Thanks Ken, good to know (I remember blowing my DUSG zener by accidentally sending 15V to it, but it was probably into one output) It was also to conform with the Serge "standards" of 0-5 V for the sequencers, but maybe it's not that important, and just a matter of habit. So, not
2016-07-22 by Ken Stone
It shouldn't worry the Serge at all. Serge inputs (according to the Gold Book) can take up to 25V in, and I've seen nothing to contradict that. These voltages are turned into tiny currents by the input resistors. In the case of mixed inputs, the current from two 7.5 volt signals
2016-07-22 by phijel
Hello I'm currently building a TPS and successfully completed the 16 steps sequencer part (including the vertical sequence with a CGS 28) This panel is really amazing, much more powerful than the TKB as a pattern generator IMHO. But I'm running it currently from +/- 15V, and I re
2016-06-12 by Ken Stone
If I recall correctly , they were not on the original Serge version. One or two would be added as needed. Just adding them anyway is fine. On Mon, Jun 13, 2016 at 5:28 AM, guymccusker@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I've built up the CGS113 Wave Mult v1.1 board
2016-06-12 by guymccusker
I've built up the CGS113 Wave Mult v1.1 board. If I'm not wrong, on this version there are pads and space on the board for the caps across the op amps which are described in the accompanying text on Ken's site as being helpful if the op amps go into self-oscillation. Is there any
2016-06-06 by cg_synth
1) you attatchement was removed, so we can't see it. 2) the folds are all crushed together around the zero-crossing point of the wave, so you have a bunch when the wave goes up, and another bunch when the wave goes down, all very close together.
2016-06-06 by Julien Pauty
Hello guys, I've been playing with my wave multiplier. Sonically it seems to work, but I'm wondering if I get the correct number of folds, hence I may have some error in my build. I've built the version 1 Rev 2 (with four stages). I've watched the folded signal on my scope and it
2016-05-19 by guymccusker
Great, thank you --- this makes good sense.
2016-05-19 by Ken Stone
150k for the high brightness LEDs. (which is what I was looking at when I said no change would be needed!) On Thu, May 19, 2016 at 12:06 AM, guymccusker@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Thanks again, Ken -- I really am very grateful for your answers here. I'm co
2016-05-18 by charles kerr
Never had that, did you see this?: R12: This resistor is not usually fitted. If a 100k is soldered in this position, the frequency controls will also affect the Q. From: "dankedout415@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Wednesday, 18 May 2016, 16:14 Subject: [cgs
2016-05-18 by babyd_lhp
Anybody else get this problem? When the frequency pot is all the way up, It causes the resonance to peak.
2016-05-18 by guymccusker
Thanks again, Ken -- I really am very grateful for your answers here. I'm confused about the original circuit vs your current recommendation. The schematic on your web site shows a 150k resistor while the PCB I have and the BOM on your site indicates 47k. Which do you recommend,
2016-05-17 by Ken Stone
As you say, it does depend on your transistor's gain, somewhat, but those are all over the place, even in a single batch. The original Serge design used a 47k instead of a 150k there. Personally, I prefer to use voltage followers in this sort of location, as they give a more grad
2016-05-17 by guymccusker
Thanks very much Ken. I will experiment a bit. I'm surprised to hear that the driver circuit won't need adjustment. To take the example of a 10k resistor on the LED, with a 12V supply this will saturate at about 1mA (10V drop across the resistor). Assuming hFE of about 100, that
2016-05-17 by Ken Stone
I prefer to use high-brightness LEDs at very low currents. The resistor needs to be selected via experiment, though, as not all LEDs are equal. To test, connect your +VE through two diodes to the LED, then the LED resistor. Select for a value that doesn't dazzle you. I find resis
2016-05-17 by guymccusker
I'm about to build my first CGS114 DUSG. I've seen a few people mention that the module runs better with low-current LEDs rather than standard ones. First obvious question: is that true? Second question: if it is a good idea to use low current LEDs, what changes are needed to the
2016-04-28 by Ken Stone
It's been 12 years since I designed the thing, and I really don't remember a lot about it. It may be the warble I was talking about. If changing the value of CA does effect it, I guess it is. As for a 0V input, yes, it stops the clock. The following text is from the web page. I t
2016-04-28 by the_sensualworld
I have 7 populated but untested CGSLED circuit boards for sale. I would like to sell them as a set. I also have 2-CGS54 XOR/XNOR circuit boards. One is populated but untested, the other us not populated. Again I would like to sell them as a set. They are currently listed on Ebay.
2016-04-28 by phijel
Hello again I made a small vid about it here : CGS 051 WRS CGS 051 WRS Troubleshooting the WRS (CGS051) The 4 CV OUT (bottom) are following each other closely, and doesn't seem related to the CV IN's (top) - Is this the normal ... View on www.youtube.com Preview by Yahoo Sorry fo
2016-04-28 by Ken Stone
Or maybe I'm still misunderstanding still, and you are poking around in the internal works where things are behaving as they should. On Thu, Apr 28, 2016 at 6:00 PM, Ken Stone otherunicorn@... > wrote: You must have some sort of construction error that is shorting the internal VC
2016-04-28 by Ken Stone
You must have some sort of construction error that is shorting the internal VCO to the outputs, or the 4013 that selects them. On Thu, Apr 28, 2016 at 3:42 PM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Thanks Ken but maybe I wasn't clear enough in my post, so le
2016-04-28 by phijel
Thanks Ken but maybe I wasn't clear enough in my post, so let me reformulate : - the clock IN is slow - the CV IN's are slow - the CV OUT's are varying slowly indeed, and at a rate depending on the clock rate, so no problem there - but it's the internal rate of these CV OUT's tha