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2010-01-25 by Doug
Hi, Glad you got #2 working. When you say "removing other PCBs downstream", that could indicate bad grounding practices or a multitude of other issues. Can you elaborate a bit? I'm not familiar with this particular board but it might be helpful to see clear photos of the board, i
2010-01-25 by derekatumaticdotnl
Second problem of the wobbling voltage fixed by removing some other PCBs further downstream (DC Mixers + Analog Voltage, will be debuggered later), so that VCS works fine. The first one is still kaput however. Suggestions welcome! D. --- In cgs_synth@yahoogroups.com , "derekatuma
2010-01-24 by derekatumaticdotnl
...and unfortunately it's not the fun kind. I have two VCS boards assembled. Neither do what they are supposed to. The first has voltage and pot control of the slopes, input also works, lin/exp switch is fine, I get slopes out, but the end-out and trigger arrangement do nothing.
2010-01-15 by frank death
Yes, sorry, i was in another world (a 3.5mm one!) :) --- On Fri, 15/1/10, sasami@... sasami@... > wrote: From: sasami@... sasami@... > Subject: Re: [cgs_synth] How to debug non-working modules... To: cgs_synth@yahoogroups.com Received: Friday, 15 January, 2010, 2:35 AM >Are all y
2010-01-15 by sasami@hotkey.net.au
>Are all your jacks grounded? It's hard to ground a banana jack!! Ken > >--- On Sat, 9/1/10, Guy guy@... > wrote: > >From: Guy guy@... > >Subject: [cgs_synth] How to debug non-working modules... >To: cgs_synth@yahoogroups.com >Received: Saturday, 9 January, 2010, 11:08 PM > > > >
2010-01-15 by frank death
oops sorry, i missed this one! --- On Sun, 10/1/10, Guy guy@... > wrote: From: Guy guy@... > Subject: [cgs_synth] Re: Utility LFO (was:How to debug non-working modules) -- solved ! To: cgs_synth@yahoogroups.com Received: Sunday, 10 January, 2010, 11:48 PM Found it ! Accidentally
2010-01-15 by frank death
Are all your jacks grounded? --- On Sat, 9/1/10, Guy guy@... > wrote: From: Guy guy@... > Subject: [cgs_synth] How to debug non-working modules... To: cgs_synth@yahoogroups.com Received: Saturday, 9 January, 2010, 11:08 PM ...more specifically the Utility LFO, to start with. Wire
2010-01-14 by sasami@hotkey.net.au
Try adding more decoupling capacitors especially around the 4017. both 100n and 10uF. Also add them to the buffer boards. Ken >apologies if this has been addressed here but i could not find it. > >i have a 4-channel gate sequencer with a problem i want to hunt down again. >whenev
2010-01-13 by loop
apologies if this has been addressed here but i could not find it. i have a 4-channel gate sequencer with a problem i want to hunt down again. whenever three or more channels are active on one stage, the gate sequencer skips the following step. example: loop mode chan 1,2,3 activ
2010-01-13 by Bakis Sirros
Vu-us is very proud to present their newest release: Interconnected - “Current Flow”.(VU-US018) Interconnected is a collaborative electronica/ idm/ experimental project between Bakis Sirros (of Parallel Worlds, Memory Geist) and Ingo Zobel (of DRON, Signalform, Self Oscillate, Da
2010-01-12 by Richard Brewster
Yes, a 4.7uf mylar is LARGE: http://pugix.com/synth/dual-tellun-lag-processor/ That's the Tellun lag, but similar idea. You could use the Mouser part I listed for that cap. If you can make it fit! You could also try a 4.7uf non-polar electrolytic, which is the equivalent of what
2010-01-12 by Dave Kendall
Hi. FWIW, Rapid electronics in the UK do some 4u7 non-polar caps. Not too expensive either... ;-) http://www.rapidonline.com stock no; 10-5782 or stock no; 10-4110 hope this helps.... cheers, Dave On Jan 11, 2010, at 23:35, Doug wrote: > Amateurs are most welcome. ;-) > > I will
2010-01-11 by Jason Proctor
i made a couple of Bissell Lags a while back, from CGS PCBs IIRC. worked fine with no issues. i can probably look up what cap i used in my Mouser order history if anyone needs to know. >Amateurs are most welcome. ;-) > >I will probably be adding one or more of Harry's LAGs to my
2010-01-11 by Doug
Amateurs are most welcome. ;-) I will probably be adding one or more of Harry's LAGs to my SteamSynth project very soon. I looked over the circuit and realized that 4.7uf (4M7???) is a VERY large mylar cap. I doubt it is easily available, if at all. This MUST be a non-polarized c
2010-01-10 by Guy
Here's the amateur of the group (the one with the now-fixed LFO)... Tantaliums are indeed polarized. Long lead is +. I don't think you can replace a mylar with a tant. Don't tell Ken tho, he dislikes tantaliums. ;-) _g --- In cgs_synth@yahoogroups.com , "dumpstatic" wrote: > > I
2010-01-10 by sasami@hotkey.net.au
>Question #1 - would the absence of those 4 decoupling caps cause the 10uF electrolytic caps to get quite hot? No. Having the voltage across them the wrong way is what makes them hot. >Question #2 - I have a 4.7uF Tant cap where a mylar is suggested. Are Tant caps polarized? (one
2010-01-10 by sasami@hotkey.net.au
> >Found it ! >Accidentally used a 100k instead of the 150k across p12 & p14 (Schmitt Trigger). Strangely enough, the other LFO has that 100k there too, but worked... Must have been borderline, with the tollerances being the difference. Ken _______________________________________
2010-01-10 by dumpstatic
I can't find my docs for the Lag PCBs I have, but I have Harry's circuit diagram for help. I powered it up last night and it did some really strange stuff. Looking at the backside, I realized there should be some decoupling caps on the back... oops... Question #1 - would the abse
2010-01-10 by Guy
Found it ! Accidentally used a 100k instead of the 150k across p12 & p14 (Schmitt Trigger). Strangely enough, the other LFO has that 100k there too, but worked... ? Glad I got everything working now. Thanks for the help. _g --- In cgs_synth@yahoogroups.com , "Guy" wrote: > > No +
2010-01-10 by Guy
> LFO still isn't working though. Vari & Mix outputs still spitting out a steady negative voltage, but Pulse & Square now going positive (only)... I meant "LFO 2". The other one is working. srry. _g
2010-01-10 by Guy
No +V going to the chips. The +V bead wasn't soldered properly... how dumb. LFO still isn't working though. Vari & Mix outputs still spitting out a steady negative voltage, but Pulse & Square now going positive (only)... Hmmm... onwards. _g --- In cgs_synth@yahoogroups.com , "Guy
2010-01-10 by Guy
--- In cgs_synth@yahoogroups.com , sasami@... wrote: > > >Okay, so it's probably not those. I'm quite certain the speed & shape pots > are wired correctly. > > Something is preventing them from oscillating. Whatever it is, that is what > you need to find. Make sure your 1N4148 di
2010-01-10 by sasami@hotkey.net.au
>Okay, so it's probably not those. I'm quite certain the speed & shape pots are wired correctly. Something is preventing them from oscillating. Whatever it is, that is what you need to find. Make sure your 1N4148 diodes are in the right direction. Also make sure that both power r
2010-01-10 by Guy
Okay, so it's probably not those. I'm quite certain the speed & shape pots are wired correctly. But I'm wondering, which part of the PCB is LFO1 and which is LFO2 ? Not sure if that matters, but it's most likely that I've done the swap/join switches not correctly. I've hooked up
2010-01-09 by sasami@hotkey.net.au
The first step would to be to find out why it is not oscillating, so investigate the circuit around that area - and that means the speed pot and the shape pot. Getting two wires to a pot swapped could well kill it. Ken >...more specifically the Utility LFO, to start with. > >Wire
2010-01-09 by Guy
...more specifically the Utility LFO, to start with. Wired it up, with Join/Swap switches. +/-12V feed, banana jacks. LEDs don't flash, but a quick DVM measuring at the outputs gives me app. -4V on most and even -8V on some other outputs (the Vari's, I think). The output voltages
2010-01-03 by sasami@hotkey.net.au
Yes, the filter will resonate like that. Ken > > >> I just finished the Cynare, I get a steady tone when I turn the envelope dial to the left(negative i think) it starts as I hit 0 and get more intense the farther left I go. When it's in this state I can adjust the sound with the
2010-01-02 by goodnessgrows
it was a bad 4024, a new one fixed it. thanks for the help, it is much appreciated. --- In cgs_synth@yahoogroups.com , "goodnessgrows" wrote: > > Thanks again Ken. Pin 9 of all 4070s read 14.6v. I checked at the pin on the IC and on the solder side of the board. > > --- In cgs_sy
2010-01-02 by legion01x
Hmmm, the idea of a variable bandwidth actually sounds interesting. I'm using the circuit in an external processing box (not a synth module) so will have to give it a try. Thanks for the info! --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > Dual pots are used when two pa
2010-01-02 by sasami@hotkey.net.au
Dual pots are used when two parameters need to be controlled in parallel, and having them operate independently would not be beneficial, or would be outright bad. That said, in this case, you may get away with it. Your two filter parts (upper and lower) would be adjusted independ
2010-01-02 by legion01x
I'm building the band pass filter and have run into other projects that require dual pots. I have a few dual 1mg pots in stock but was wondering what the mechanical difference a dual pot offers over either two single pots or if it was possible to wires single to both throws on th
2009-12-31 by zasabo
> I just finished the Cynare, I get a steady tone when I turn the envelope dial to the left(negative i think) it starts as I hit 0 and get more intense the farther left I go. When it's in this state I can adjust the sound with the VCF Freq and Res Dials. I think I was just pushin
2009-12-31 by zasabo
Hi, Please bear with me as this is my first build and I am new to synthesizers in general, altho not new to electronics... I just finished the Cynare, I get a steady tone when I turn the envelope dial to the left(negative i think) it starts as I hit 0 and get more intense the far
2009-12-25 by Dave Kendall
Thanks Doug! Will maybe finish the build later today....... :-) cheers, Dave On Dec 25, 2009, at 09:45, Doug wrote: > Dave, > > Ding! Yup that's the one, with the 47pf cap across it. I doubt > anything else needs to change. > > Doug > > --- In cgs_synth@yahoogroups.com , Dave Ken
2009-12-25 by Doug
Dave, Ding! Yup that's the one, with the 47pf cap across it. I doubt anything else needs to change. Doug --- In cgs_synth@yahoogroups.com , Dave Kendall wrote: > > Hi all. > > An easy one hopefully......... > > The input CV is specified as 0 - 5V. If I wanted to change it to 0 -
2009-12-25 by Dave Kendall
Hi all. An easy one hopefully......... The input CV is specified as 0 - 5V. If I wanted to change it to 0 - 10V, would the 47K resistor between pins 1 and 2 of the CV summing opamp be the one to change? Would any other components need to be changed if this is done? cheers, Dave
2009-12-21 by joshdaigleusa
Never mind - dug far enough back and found my answer :) --- In cgs_synth@yahoogroups.com , "joshdaigleusa" wrote: > > I never saw this answered or explained - I'm building this soon and am curious about adding a range switch. > > Thanks. > > --- In cgs_synth@yahoogroups.com , "To
2009-12-21 by joshdaigleusa
I never saw this answered or explained - I'm building this soon and am curious about adding a range switch. Thanks. --- In cgs_synth@yahoogroups.com , "Tom Adam" wrote: > > Whatever you decide, leave place for the range switches. > > I stated with an on-off-on toggle switch, but
2009-12-13 by goodnessgrows
Thanks again Ken. Pin 9 of all 4070s read 14.6v. I checked at the pin on the IC and on the solder side of the board. --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > Check that pin 9 of the 4070 really does go to +ve. It may be floating. > > Ken > > >Thanks very much Ken.
2009-12-12 by sasami@hotkey.net.au
Check that pin 9 of the 4070 really does go to +ve. It may be floating. Ken >Thanks very much Ken. > >There's continuity between the 4070 pin 8, and the 4024 pin 12, and I replaced the jumper that's in the path just to make sure it wasn't those joints. > >There is also some anoma
2009-12-12 by goodnessgrows
Thanks very much Ken. There's continuity between the 4070 pin 8, and the 4024 pin 12, and I replaced the jumper that's in the path just to make sure it wasn't those joints. There is also some anomalous behaviour in the div4 outputs. instead of being properly offset in phase, 3C &
2009-12-12 by sasami@hotkey.net.au
The fault would be with a bad connection between the 4070 (pin 8) and the 4024 (pin 12). Possibly a missing link, or a bad joint or break in the track. The counter is working fine if all other outputs are behaving. Ken >i recently built the cgs master divider, and am having troub
2009-12-12 by goodnessgrows
i recently built the cgs master divider, and am having trouble isolating a couple of problems (possibly one problem with two symptoms). everything works fine, except: 2A stays at 5v, and 2C stays at 0v. the other "2" divisions work fine. i swapped out the transistors related to t
2009-11-29 by Tim
Steve has kindly answered my question over at the SergeModular group: http://launch.groups.yahoo.com/group/SergeModular/message/6497 - basically the emitter-base junction is used in reverse as a 7V zener diode!! Tim --- In cgs_synth@yahoogroups.com , "Tim" wrote: > > Hi list, > I
2009-11-29 by Tim
Hi list, I recently posted this at the SergeModular Yahoo group, but it was suggested that here might be a better place, so here goes!: I'm trying to simulate the Negative Slew from this schematic: http://www.cgs.synth.net/synth/serge/pic/serge_negative_slew_schem.gif I'm trying
2009-11-22 by sasami@hotkey.net.au
See the Active Real Ring modulator - CGS67. It has the buffering as part of it. You also need a power supply and a second signal source, such as an oscillator. Have a look at the Frostwave Blue Ringer for inspiration. Ken >i realise the website says "if you don't know, don't ask.
2009-11-22 by Jason Proctor
i realise the website says "if you don't know, don't ask..." :-) a musician friend asked me to build him a ring modulator, and after determining that he was after a hardware one rather than a software one (you have to check, these days...) i thought that building a *real* one wou
2009-11-07 by Jan-Ahrent Czmok
Thanks for your Bandwidth ! Some stuff for sale: 1 x keyboard for synthesizer - 50 EUR 10 x CGS-LD (Ken Stone) - 1 EUR per PCB 1 x CGS24 Gate to Trig - 2 EUR 3 x Silent:arts HWBP (Bypass PCB) for D-AOC - 5 EUR per PCB 6 x knobs 15mm 7mm inside - 5 EUR / set 5 bands (10 each) of A
2009-11-06 by Thomas Garrison
Hello, I have the following modules for sale. They are on 19" custom black panels. They vary from 1U panel up to 5U panel. All panels are 1/8" jacks. Here are the modules: First panel: CGS Programmer Sequencer 4 channels - 8 steps each channel with two Thomas Henry SN Voices 5U p
2009-10-27 by Jon
I just finished building my VCS last night. Fall works as it should with both the knob and the CV inputs. Rise on the other hand seems to be almost dead. When I look at the output on a scope I can see the rise knob effects the slope but very slightly and not enough to actually do