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2017-10-04 by joshua lawson
There’s info about diode matching here: Ken Stone's Modular Synthesizer Ken Stone's Modular Synthesizer Descriptions of the various modules in a home built music synthesizer. Sent from Yahoo Mail for iPhone On Wednesday, October 4, 2017, 7:51 AM, Mike Burnham mikejburnham@... [cg
2017-10-04 by Mike Burnham
Yes thanks that makes sense Any easy way to match diodes? I do have some 1n4153 which are supposed to be high tolerance 1n4148 . Maybe these would be better? Sent from my iPhone On 4 Oct 2017, at 12:36, Ove Ridé nitro2k01@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I think
2017-10-04 by Ove Ridé
I think this is an inherent flaw in the design, deemed to be of sufficient performance for LFO use. The culprit is probably the matching of the diode pair. One diode in the pair conducts on the positive cycle, and the other on the negative. You may match up the shape for one sett
2017-10-04 by Ken Stone
No, the shape should remain constant throughout the speed range. It sounds like you have a "shape" issue or you have speed and shape pots miswired/mixed. On Wed, Oct 4, 2017 at 8:38 PM, Mike Burnham mikejburnham@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hi there I'm a bi
2017-10-04 by Mike Burnham
Hi there I'm a bit confused about this LFO If I set the LFO for a perfect triangle at a certain frequency when I drop the frequency it changes shape. When its really slow you can't really see the shape on a scope and you have to adjust by ear. And I am finding it very difficult t
2017-10-03 by Ken Stone
Yay for success. Treatments can really mess with the mind, can't they. Ken On Tue, Oct 3, 2017 at 8:55 PM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Success I was trying to figure out how the hell the column LED would light but the jack wouldn’t output th
2017-10-03 by Paul Bower
Success I was trying to figure out how the hell the column LED would light but the jack wouldn’t output the pulse, then (after fixing a couple of dry joints that broke from repeated dismantling) I realised that if the output was shorting to the chassis, but the ground cable wasn’
2017-10-03 by Paul Bower
Phew - thanks for confirming that On 3 Oct 2017, at 00:26, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Later boards only needed 6 links because I found a way to eliminate the outer links. Ken On Tue, Oct 3, 2017 at 12:22 AM, Paul Bower paul@... [cgs_
2017-10-03 by Ken Stone
Later boards only needed 6 links because I found a way to eliminate the outer links. Ken On Tue, Oct 3, 2017 at 12:22 AM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Just want to check something on the switchboard - I have a board that has only six wire lin
2017-10-02 by Paul Bower
Just want to check something on the switchboard - I have a board that has only six wire links marked on the silkscreen - the inner six links between the rows of switches I realise on the current documentation that there are a further six wire links on the edges of the board. My P
2017-10-02 by Paul Bower
Okay, that’s sort of good to know - dry joints - and I used to be so good at soldering :-) Cheers Paul On 1 Oct 2017, at 23:46, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: You have a bad jack or have miss-wired it, or perhaps you have broken the pad
2017-10-01 by Ken Stone
You have a bad jack or have miss-wired it, or perhaps you have broken the pad where the wire is soldered from the PCB. I can't think of anything else that would cause this problem. On Mon, Oct 2, 2017 at 3:47 AM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote:
2017-10-01 by Paul Bower
…Sorry, forgot to add: The end column Full & Pulse outputs for all eight steps on all four rows are just fine On 1 Oct 2017, at 16:43, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hello there, I’m fairly certain this was all working fine, but yesterday I rea
2017-10-01 by Paul Bower
Hello there, I’m fairly certain this was all working fine, but yesterday I realised that the Step Out on Step 5 wasn’t working. It may have been like that for some time because strangely the LED was working just fine, just no output at the jack. I checked everything on the main b
2017-08-13 by Ken Stone
no idea! Instead, have 1 go to the CW end of the pot, CCW end to 0V and wiper to the resistor that was previously connected to pin 1. 100k fixed resistor in the feedback. This of course assumes you are using it as a mixer and not a processor. The master volume won't work with it
2017-08-12 by Synth asaurus
Hi, I think it would be better to remove the pot and replace the 100K resistor. Connect the clockwise pin of the pot to the output (to the right of the 1K output resistor), connect the counter-clockwise pin of the pot to ground, and the center pin of the pot will be your new outp
2017-08-12 by freq63
I added a pot as master level control but it acts weird no matter how. Warning it’s getting pretty loud, but it shows what happens when the pot is getting fully opened: http://www.batchas.com/serge/ CGS04-Mixer-issue-pot-out.mp3 I replaced the 100k* resistor with the pot (no matt
2017-06-25 by Paul Bower
got it cheers paul On 25 Jun 2017, at 10:47, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: It would miss an entire step if it was a problem. On Sun, Jun 25, 2017 at 7:23 PM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: You mean a
2017-06-25 by Ken Stone
It would miss an entire step if it was a problem. On Sun, Jun 25, 2017 at 7:23 PM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: You mean a kind of lag between the reset event and the clock advancing to step 2 / step 3 etc ? I’ll check for that - I just tacke
2017-06-25 by Paul Bower
You mean a kind of lag between the reset event and the clock advancing to step 2 / step 3 etc ? I’ll check for that - I just tacked the extra cap on the back of the board, so it’s not so much of a faff to try some lower values On 25 Jun 2017, at 10:17, Ken Stone otherunicorn@...
2017-06-25 by Ken Stone
The only "issue" having the reset cap to big is that it may prevent a clock pulse from advancing close to when the reset occurred. On Sun, Jun 25, 2017 at 6:42 PM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Good to hear from you Ken - hope things are good
2017-06-25 by Paul Bower
Good to hear from you Ken - hope things are good over there Since that’s all I had, I just put a 47nF cap across the existing 10nF and that did the trick In case anyone else comes across this, it was a very old board. I could get the gate sequencer to reset from its own 12V step
2017-06-25 by Ken Stone
I should work that way already. Perhaps increase the size of the 10n reset cap to 47n to let a bigger pulse through. On Sun, Jun 25, 2017 at 6:44 AM, Paul Bower paul@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hello there, Just wondering if anyone could recommend a way of
2017-06-24 by Paul Bower
Hello there, Just wondering if anyone could recommend a way of modding the reset input to accept +5V instead of +12/13V Cheers Paul Paul Bower Un! Recordings Limited Company Reg. 06870185 www.unrecordings.co.uk
2017-03-16 by Synth asaurus
Hello all, I was wondering if anyone with a CGS 116 can do some CV input verification checks for me. I tested all of my CV inputs with a rising positive voltage to see how the different stages and inputs behave as the module receives a repeating gate signal.. Can someone please v
2017-02-28 by re.toxx
hello everybody, i'd like to know the right way of adding inputs to my res eq. somehow everything i do changes the behavior of it. right now i have two inputs, each with its own buffer. it seems fine, but when i change the resistor before it enters the eq, which is point M in the
2017-02-23 by Ken Stone
I suspect it is some sort of delay. I'm not sure where it is creeping in, though. Check the transistor feeds power to the chips. If there is a bad connection, or it is in backwards, those chips would be current-starved. Also try adding decoupling capacitors directly between the p
2017-02-23 by andrew buscher
Thanks for the reply. I have a TL074CN. Is this propagation delay? Thank You -Hans Buscher 310-776-0143 text On Feb 22, 2017, at 8:10 PM, Ken Stone otherunicorn@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Did you use a TL072, or did you substitute it for another chip? On T
2017-02-23 by Ken Stone
Did you use a TL072, or did you substitute it for another chip? On Thu, Feb 23, 2017 at 10:12 AM, andrew buscher hansbuscher@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hello All. My CGS89's pulse outs have a very short "ghost pulse"after the main pulse. This occurs in bot
2017-02-23 by andrew buscher
Hello All. My CGS89's pulse outs have a very short "ghost pulse"after the main pulse. This occurs in both the A&B outs. It's the same height as the main pulse do it does trigger things. I've swapped the 4017 & 4081s with no change. Any ideas anyone? ---------- Thank You -Hans Bus
2017-02-22 by phijel
Thanks ! In the meantime I got it working perfectly ;-)
2017-02-22 by Ken Stone
1) 0v to pin 7. 2) wouldn't matter. 3) transistor is working as a diode instead of a voltage follower, thus the LED would still light. On Thu, Feb 23, 2017 at 12:18 AM, philippe@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Currently building a breadboard version of the CGS2
2017-02-22 by phijel
Currently building a breadboard version of the CGS22 Master Divider (I hope it’s ok to discuss this here) and had the following questions : The schematic indicates pin 7 from the 4x 4070’s is connected to -15V. But it looks like they’re connected to 0V on the board ? On the schem
2017-02-08 by guymccusker
Just to check my understanding of the CV: I believe the panning works by providing negative gain when you pan away from one side, rather than by adding gain -- is that right? So for instance panning channel 1 hard left applies a 0 CV to the gain cells that sends channel 1 to the
2017-02-07 by Ken Stone
It may come down to the gain of the transistors used, in which case you will need to decrease the 5k6 leg of the CV dividers on each module. The cells have HUGE gain. On Wed, Feb 8, 2017 at 6:51 AM, guymccusker@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: For what it's wort
2017-02-07 by guymccusker
For what it's worth, I just made some measurements on my freshly built DCSM (which is no longer a smoke generator -- long story) It also has pretty massive gain. 1V on the CV input gives a gain of 20dB, so it's pretty impossible to avoid clipping when the CV is 2V or more. What w
2017-02-06 by Ken Stone
reduce the value of the resistors on the back. If that doesn't do anything, look for a construction error. On Tue, Feb 7, 2017 at 8:46 AM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Ah yes ; builders oversight on my part. Still stumped on
2017-02-06 by Stephen Richards
Ah yes ; builders oversight on my part. Still stumped on this problem of excessive VC gain though. From: "Ken Stone otherunicorn@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Tuesday, February 7, 2017 8:12 AM Subject: Re: [cgs_synth] CGS 101 - Serge DCSM Ver 1.0 LK is ment
2017-02-06 by Ken Stone
LK is mentioned on the pad table. On Mon, Feb 6, 2017 at 11:38 PM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Thanks Charlie I had indeed missed that LK pads link !! The smallest i've ever dealt with in all my years of building CGS pcb's.
2017-02-06 by Stephen Richards
Thanks Charlie I had indeed missed that LK pads link !! The smallest i've ever dealt with in all my years of building CGS pcb's. (Perhaps a worthy note for the build page Ken ?) It hasn't completely fixed the gain problem of the VC Gain , it's still full on. From: "charles kerr t
2017-02-06 by charles kerr
I had a few of issues with one I built, it was behaving very oddly - but I must say it was a while ago so my memory is a bit hazy as to exactly what the oddness was. I couldn't figure it out until I noticed I'd not added the link between the two LK pads... Not particularly helpfu
2017-02-06 by Stephen Richards
So i double checked the wiring , my left CV was going to the right and vice versa, That's fixed. Still problems though. As i stands : If i have a single CV going to either Channel 1 or Channel 2 response is normal. With the Gain Pot at Max the output is metering the same but effe
2017-02-05 by Stephen Richards
I'll recheck Ken, thanks. From: "Ken Stone otherunicorn@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Monday, February 6, 2017 10:40 AM Subject: Re: [cgs_synth] CGS 101 - Serge DCSM Ver 1.0 I presume it is the first version of the PCB. The resistor mods on the back of it a
2017-02-05 by Ken Stone
I presume it is the first version of the PCB. The resistor mods on the back of it are to deal with that problem. Make sure you soldered them to the right pins, and used the right values. Those cells have enormous gain without those resistors. On Mon, Feb 6, 2017 at 10:16 AM, Step
2017-02-05 by Stephen Richards
I have a finished version of CGS 101 in my custom panel with the Mods from the build page done and am experiencing very full on response from the Gain CV. Huge jumps in gain when CV is applied at the the Gain CV jack. Far too much for it to be workable. Is there any way to attenu
2017-02-03 by Paul Schulz
Well, there is a difference in the ResEq's sound between cheap and expensive opamps when pinging/ringing it to create percussions - not in that much when using it as an audio processor. The cheap opamps created a more aggressive sound and had more smack, more attack (maybe just b
2017-02-03 by Ken Stone
If the whistle varied with the WAD delay, I'd expect it was picking up the WAD's internal clock, but if it remains fixed, it is probably an op-amp on the res eq itself oscillating. Really, you are wasting your money on expensive op-amps. The circuits were not designed with them i
2017-02-03 by Stephen Richards
Thanks Ken. The use of those was through the build thread on Muffs about three years ago. Jason suggested using those or OPA2134. So i decided then to try it. The RES EQ is mounted below the WAD. I'm going to test it without the WAD above it and see if the sound improves. From: "
2017-02-03 by Ken Stone
use the correct op-amps. On Fri, Feb 3, 2017 at 10:11 AM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: I built the CGS 202 to incorporate into my new custom panel. Since testing i had noticed a constant very high pitched (around 12K) noise i
2017-02-02 by Stephen Richards
I built the CGS 202 to incorporate into my new custom panel. Since testing i had noticed a constant very high pitched (around 12K) noise in the background of the output , even though the normal function of the Res Eq seems fine. I have used OP275 op amps in this build and styrene