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2011-10-17 by Stephen Richards
Hi Laurie If you mean JP1 , then yes it is fitted ; wire link. Stephen ________________________________ From: Elby Designs elby_designs@... > To: cgs_synth@yahoogroups.com Sent: Monday, October 17, 2011 10:46 PM Subject: RE: [cgs_synth] Re: Best of CGS Panel #3 Oscillator signal
2011-10-17 by Stephen Richards
Thanks Laurie , i'll check it tomorrow. ________________________________ From: Elby Designs elby_designs@... > To: cgs_synth@yahoogroups.com Sent: Monday, October 17, 2011 10:46 PM Subject: RE: [cgs_synth] Re: Best of CGS Panel #3 Oscillator signal bleed problem You should also n
2011-10-17 by Elby Designs
You should also note that there is a link on the All-In-One that connects the DC 0V to EARTH so you need to establish if that is fitted or not. Best Regards Laurie Biddulph Mobile: 0400 257 645 Web: www.elby-designs.com -----Original Message----- From: cgs_synth@yahoogroups.com [
2011-10-17 by Stephen Richards
Thanks again Ken and Mike ; I'm going to have to digest this all. This is what i now have : I have just removed the Banana Jack Signal Ground from the Earth Stud and connected it to one of two 0V on the 15V side of the Power Module. (this is the only change i have ever made to th
2011-10-17 by sasami@hotkey.net.au
I never connect my signal ground directly to mains ground. I always put a 1k 1 watt resistor between the two. This helps prevent ground/hum loops. That also means that my panels cannot be mounted hard to a metal case that is grounded to mains earth. I solve that by having my powe
2011-10-17 by magman2112
Hi Stephen, I think this may be part of your problem, you should definitely be using the 15V side for you signal ground connection. Think of it this way. The output of the oscillator is a varying voltage - or potential difference. This potential difference has to be "different" t
2011-10-17 by Stephen Richards
Hi Mike I'm connected to the Main Earth Stud on the 240V side for the Signal Out Ground Connection. So i should connect Signal Out Ground Connection to the Ground on the 15V side , is that correct ? Do any of the Earth / Ground connections need to be physically connected to the C
2011-10-17 by Stephen Richards
Thanks Ken , I'll try it out. Stephen ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Monday, October 17, 2011 5:05 PM Subject: Re: [cgs_synth] Best of CGS Panel #3 Oscillator signal bleed problem Things to try: 1) increase t
2011-10-17 by magman2112
Hi Stephen, Can I double check with you about the signal ground connections? On the PSU are you connecting to the chassis mains earth or the 0V (ground) connection, as you should definitely be using the 0V connection? The signals in the CGS48 oscillator are with reference to 0V a
2011-10-17 by sasami@hotkey.net.au
Things to try: 1) increase the size of the decoupling capacitors near the oscillator power connetions. Add 100n caps there as well. 2) Run a separate set of wires from the oscillators to the power supply, so that the oscillators and the other circuits are not sharing the same wir
2011-10-17 by Stephen
Hi Ken and All I built the Best of CGS Panel #3 last year and i have never been able to get rid of the signal bleed from the CGS 48 oscillators. To describe what is happening : Even with nothing patched ; when i plug the panel's output into a mixer , even with the output turned a
2011-10-12 by nn3nn3
Mouser also has them for $0.67 http://www.mouser.com/Search/Refine.aspx?Keyword=1n34a All the Best, Brian --- In cgs_synth@yahoogroups.com , Michael Kelley wrote: > > On the topic...a solid supplier link for Diodes 1N34A > http://www.cpcares.com/NTE/diodeBulk/1N34A-10.html > Hap
2011-10-12 by Michael Kelley
On the topic...a solid supplier link for Diodes 1N34A http://www.cpcares.com/NTE/diodeBulk/1N34A-10.html Happy Building : ) - Mike ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Sunday, October 9, 2011 12:17 AM Subject: Re:
2011-10-09 by sasami@hotkey.net.au
It shouldn't be an issue with your applications. Also, in my experience, schottky diodes don't really need to be matched because they are already pretty close to each other (from the same batch, at least). >Hi All , i'm about to build the RRM and use it as a frequency doubler. >I
2011-10-09 by gff_ims
Hi All , i'm about to build the RRM and use it as a frequency doubler. Is there a need to be concerned with diode matching as a bit of carrier bleedthrough would - i think - be an advantage? As the carrier is half the output , then the output in effect would have the octave and s
2011-09-23 by scozbort
Thanks for the info Ken. I've been using it fine with an attenuator on the output. I'm have mostly Frac and DIY modules, with 1 Euro and 1 or 2 DIY running on 12V, so I will just watch it with those ones. I will keep an ear out for anyone else experiencing the same thing, but I s
2011-09-23 by sasami@hotkey.net.au
>> >> The only other problem I can see is that Ken has 4 x 220K listed in his BOM >> and then says in the text that they should be 22K. I have supplied 220K The BOM and overlay are correct. There was a SINGLE 220k that needed to be changed to 22k, and only on the red version of t
2011-09-23 by sasami@hotkey.net.au
A 20 turn trimmer will not increase your range of adjustment. Most modulars would be unphased by seeing 15 volts at an input. Remember that this voltage is current limited by both input and output resistors. For example, the Serge is stated as being able to handle 25V at its inpu
2011-09-22 by scozbort
That's the thing! When cycling it does produce around 5v. But when triggered externally it can get right up to 15v. But only with long fall times. Its like each successive trigger adds to the voltage when using long fall times. --- In cgs_synth@yahoogroups.com , Richard Brewster
2011-09-22 by Richard Brewster
It is not functioning right if the output swings to +15V when cycling. Ken's notes: Adjustments on the VCS board are set to obtain a 0 to +5 volt level when the unit is cycling, producing a 100Hz triangle wave. An oscilloscope is required for this adjustment. In an oscilloscope i
2011-09-22 by scozbort
Cheers Laurie, I appreciate you input! Its the main OUT that gets hot. And I'm using a REV1.0 PCB so the 220k resistors should be correct. I thought about sticking a resistor on the output but that would affect the cycle out as well, which does not need attenuation. Its sounding
2011-09-22 by Elby Designs
The END OUT output should be clamped to 5V because there is a zener diode in that line. If that is the output you are having problems with then the zener is either faulty, not fitted, or the wrong value. The OUT output doesn't have any such protection and it is feasible for the o
2011-09-22 by scozbort
OK here is some more info. Most people seem to have difficulty with the transistor pin-outs not matching the circuit. I don't think this is the problem here. The module functions perfectly (except for hot output), and the transistors were supplied in an Elby kit. I have emailed L
2011-09-13 by scozbort
Hi! Can't believe I only just found this place... I'm having an issue with my VCS build and hoping someone has come across it before. When I use the trigger in and slow fall times the module outputs very hot voltages - I think it would go to 15v if I let it. But in cycle mode it
2011-08-29 by clarkehome68
Hey Group, just an FYI for those of you who don't frequent the DIY section of Muff Wiggler's, I'm having some cool (well, I think they're cool) CGS Euro panels made, and I just started the order thread last night: http://www.muffwiggler.com/forum/viewtopic.php?t=41432 The panels
2011-08-27 by sirolffoonav
wow, for a moment i thought guitarist alan licht moved to germany and builds modulars, hehe. anyway, this is just what i need! i'm going to bid on this. except maybe the asr, anyone uses 2 of them linked? and how's the delay board developed? there's no pictures best, floris http:
2011-08-26 by jtmcnc
I figured I should post here as I don't think CGS stuff comes up on ebay very often. These are located in Germany, but can ship cheaply anywhere. 100% feedback. Message me if you have questions. http://www.ebay.com/itm/270805221574?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2
2011-07-29 by Mongo
Hi James, I may be mistaken, but I think the diodes are being used as voltage controlled resistors. They and the associated capacitors form a series of RC pairs that form the poles of the filter. This technique started out using transistors in the venerable Moog filter, but Dr Bo
2011-07-29 by dchang0
Awesome! Thanks, Mike--you saved me more hours of tracking down datasheets! --- In cgs_synth@yahoogroups.com , "magman2112" wrote: > > > > Hi, > > The PCB pads on the CGS26 boards will actually take quite a few different models of trimmers. I would suggest that a good multi-turn
2011-07-29 by magman2112
Hi, The PCB pads on the CGS26 boards will actually take quite a few different models of trimmers. I would suggest that a good multi-turn trimmer from Bourns or Vishay works best. From Allied you can use the Bourns 3296 series, the W being in-line pins, Y being offset pins (both o
2011-07-28 by dchang0
Hi, all-- I'm having a heck of a time locating the 10K linear trim pots (marked "10K SPAN" on the CGS26 board). What form factor are these? The drawing on the PCB suggests box-shaped fine-multi-turn, but I'm getting lost in all the different shapes and sizes out there. Allied Ele
2011-07-02 by Tor Olav
Thanks for the input! You where right at assuming this: > 2) Maybe you did not have one with a high enough rated voltage. The Tant was 16V. No wonder it went ka-boof. > 3) Tants do that for no apparent reason from time to time. I refuse to use the nasty things myself. Use regular
2011-06-30 by sasami@hotkey.net.au
>When I hooked it up, it worked nominally for a couple of secs and then the tantalum cap blew up in firy fury. Green flashlight all over my flat. Spectacular :) 1) Maybe you put the Tant in backwards. 2) Maybe you did not have one with a high enough rated voltage. 3) Tants do tha
2011-06-30 by Tor Olav
Hi group I have had some fun trying to troubleshoot a CGS22 master divider (old version) that I bought a couple of years ago from a kind person in this group. I ask these questions to the group as a whole, because that may increase the chances of reaching somebody who has had a s
2011-06-26 by analougecircuits1
Finally picked up the project again and the problem was simply a overheated point that created a cut... I really need to get a clean soldering pin. Beautiful distortion. Thank you. --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > > >My main worry is: > >Might this be a op
2011-06-22 by Adam Scramstad
Thanks Ken for double checking, I appreciate it. All inputs/outputs, switches & knobs seem to function as they should. I'll spend some time using & getting familiar w/ this module . . . especially the "looping" and how each stage is added etc. Every module in this SWAMP Sequencer
2011-06-22 by sasami@hotkey.net.au
The wiring all sounds right. Ken > > >On Jun 22, 2011, at 12:46 AM, sasami@... wrote: > >> >Have you accidentally added the Comp Out into the mixer? It should >> not be >> connected. >> >> Ken >> >No, it doesn't look like it. > >On Jun 22, 2011, at 12:47 AM, sasami@... wrote: > >
2011-06-22 by Adam Scramstad
On Jun 22, 2011, at 12:46 AM, sasami@... wrote: > >Have you accidentally added the Comp Out into the mixer? It should > not be > connected. > > Ken > No, it doesn't look like it. On Jun 22, 2011, at 12:47 AM, sasami@... wrote: > Or is pot 8 properly grounded? > The ground wire co
2011-06-22 by sasami@hotkey.net.au
Or is pot 8 properly grounded? _______________________________________________________________________ Ken Stone sasami@... otherunicorn@... Modular Synth PCBs for sale http://www.cgs.synth.net/ > Australian Miniature Horses & Ponies http://www.blaze.net.au/~sasami/ >
2011-06-22 by sasami@hotkey.net.au
>OK..... for example: > >1 - if you capture 1x pulse & loop it - then turn all stage cv/knobs >to "zero"..... >2 - then monitor the CV at the "MIX" OUT ..... >..... why does the voltage jump/increase as it passes through stage 8? >Seems like with all stage knobs on zero . . then
2011-06-22 by Adam Scramstad
Hi Ken, First off - thank you for your input and info :) OK..... for example: 1 - if you capture 1x pulse & loop it - then turn all stage cv/knobs to "zero"..... 2 - then monitor the CV at the "MIX" OUT ..... ..... why does the voltage jump/increase as it passes through stage 8?
2011-06-21 by sasami@hotkey.net.au
>1 - Whenever the CV "SENS" knob is turned counter clockwise below 2- >oclock.... the "COMP OUT" LED turns on and a voltage is produced at >the "COMP OUT" jack. You are merely setting the detection point below the range of the incoming signal (or 0V if there is not signal). It is
2011-06-21 by Adam Scramstad
Hi all - I just finished building a "Best of CGS" SWAMP Sequener Panel (flipping awesome BTW). But I'm having some difficulty w/ the CGS13 Gated Comparator module...... there appears to be a few issues. I have never used a module like this (it's seem very unique - and I love that
2011-06-17 by drryle
Muchos Gracias Amigo! --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > > >What is the RESET function on the panel supposed to be? Is it a jack and > LED or push button and LED? Either way I'm sort of confused about how to > wire either in. > > Jack and Pushbutton. > > I'd
2011-06-17 by sasami@hotkey.net.au
>What is the RESET function on the panel supposed to be? Is it a jack and LED or push button and LED? Either way I'm sort of confused about how to wire either in. Jack and Pushbutton. I'd connect the wirefrom the PCB to the jack tip, and the jack tip via a 1k to the push button.
2011-06-17 by drryle
I have a Bridechamber panel for this build which has a .38" hole and a .25" hole drilled at the "RESET" labelled region. See... http://bridechamber.com/C_Master_Div.html What is the RESET function on the panel supposed to be? Is it a jack and LED or push button and LED? Either wa
2011-06-01 by Adam Scramstad
Hi Ken - Thank you for the clarification - I appreciate it! Back to soldering & learning :) - Adam On May 31, 2011, at 5:05 PM, cg_synth wrote: > Look at the transistor markings on the PCB. Two have a tiny arrow > pointing inwards. These are the BC557. They are at the end of the
2011-05-31 by cg_synth
Look at the transistor markings on the PCB. Two have a tiny arrow pointing inwards. These are the BC557. They are at the end of the board with the unicorn. One is near the unicorn, and the other is about 1/2" diagonally away from it. All the rest have the little arrow pointing ou
2011-05-31 by Adam
Hi all, Probably a "newbie" question - but I need to check: I'm building a CGS36 ver1.3, and the MOM says 2x BC557, and 12x BC547. Then on the PCB, its simply says "Transistors BC547, BC557"...... so my question is where do the BC557's go? Does it matter - or can I all BC547's? T
2011-05-31 by Dennis Chang
Yes, the signal being fed into your CGS26 won't be processed per se--it'll be raw voltage waveforms directly from the transducers--but it definitely has a shape that is later processed by the brain and formed into a MIDI envelope. I'll order a CGS26 right away and start tinkering