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2015-05-05 by Dave Kendall
FWIW, if it's a short run, soldering to the nearest lug is probably better anyway, as it doesn't risk damaging the tracks which can be fragile. Rigid tinned wire is best for this IMO, and can look quite neat. Hope you find the fault. cheers, Dave On 5 May 2015, at 13:36, spunradd
2015-05-05 by spunraddish
Yes, the correct tracks were cut, established in the continuity testing, and I also made sure that other tracks weren't cut - actually, instead of soldering directly to the tracks as was suggested in the diagram, I just went to the next closest solder lug, so my answer may lie th
2015-05-04 by bjrnsynneby
FYI the Burst Generator works on 12 volts. A great module.
2015-05-03 by Stevie Richards
I know I sounds obvious but did you also do the track cuts in the mod ? On 4 May 2015, at 2:37 am, " spunraddish@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Thanks for the info guys. So far it seems that the mods were done correctly, as far as signal continuity is concern
2015-05-03 by spunraddish
Thanks for the info guys. So far it seems that the mods were done correctly, as far as signal continuity is concerned across the correct channels. The 5k6s are in the correct spots. I know I'm tapping the CV outputs just fine as well, and I have installed attenuators for the cv a
2015-05-03 by Ken Stone
You certainly have something wrong going on. Make sure those mod resistors are soldered in the right places. Without them, you will have crazy gain. On Sun, May 3, 2015 at 10:22 AM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hi Eric Ken wi
2015-05-02 by Stephen Richards
Hi Eric Ken will probably chime in on this but have you done the Mods to the PCB as detailed here ? CGS101 is the Quad VCA used in the DCSM. http://www.cgs.synth.net/modules/pic/pcb_cgs101v10_qvca_fix.gif http://www.cgs.synth.net/ From: "spunraddish@... [cgs_synth]" To: cgs_synth
2015-05-02 by spunraddish
Hey guys, I haven't heard from a single builder who built one of these before, so I may be treading foreign territory. I built up the DCSM, and it works, but not nearly as what I would imagine to be correct. For one, I can't seem to trim out the distortion, and the gain pots on e
2015-04-29 by spunraddish
Alright, I switched out the transistors for BC557s, and the first two stages had barely any give at the front end. Scott was right, I used PN4250s when I should have placed them backwards. I ended up burning out the two 3080s - expensive mistake. I had two more, though I know I s
2015-04-28 by spunraddish
Thank you both, that seems really helpful, I'll check it out tonight. Also, I'm going to take a look at that parts faq for what my be the first time :P
2015-04-28 by Ken Stone
Doh! Transistors not chips. Scott has the right idea. On Tue, Apr 28, 2015 at 3:00 PM, Ken Stone otherunicorn@... > wrote: Is it a 74HC4250? If so, you have the wrong part. I suggest you read the parts FAQ, as it covers the issue. Basically, there are 5V chips that use the same n
2015-04-28 by Scott Young
I think they could need reversed. Ive had similar issues with these when I was building the Smooth / Stepped Generator, in that I think the part number I had was PN4250A which had a different pinout to the PN4250 layout on the board. Also, from the documentation of the Serge nois
2015-04-28 by Ken Stone
Is it a 74HC4250? If so, you have the wrong part. I suggest you read the parts FAQ, as it covers the issue. Basically, there are 5V chips that use the same numbers as the CMOS chips, and they get stinking hot. Ken On Tue, Apr 28, 2015 at 2:49 PM, spunraddish@... [cgs_synth] cgs_s
2015-04-28 by spunraddish
Hey guys, my first post here. I wired up my wave multipliers, and almost burned myself on the 4250s - there was no smoke, and I was able to turn it off before anything got destroyed, or so I think, since when I would power it on again, the same thing would happen. I think I've us
2015-04-25 by bjrnsynneby
Thank you. My mounting bracket was shorting the caps nearby U1. I realized this just by putting my thumb over the area and the sinus stopped. Now the module sounds very very satisfying. Next step is to bring out some individual outs for some of the bands.
2015-04-24 by cg_synth
No, it doesn't matter which pot you take the CCW and CW chains from. I'd look for an incorrect part value, or soldering problem in the area of the affected frequency.
2015-04-24 by bjrnsynneby
I just finished my Serge Res Eq build and all bands seems to be working except the 61Hz. The major problem I have is a high pitched and steady sinus sound coming out of the module even without any input. The signal appears out of both upper and lower comb and the out jack and is
2015-04-18 by Stevie Richards
A super worthwhile mod IMHO ! On 18 Apr 2015, at 9:27 pm, "Steve Inselman steveinselman@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Thanks Stephen.That wiring schem was helpful. A hi and low a spst will do it for me . On Thursday, April 16, 2015 6:18 PM, "Stephen Richards
2015-04-18 by Steve Inselman
Thanks Stephen.That wiring schem was helpful. A hi and low a spst will do it for me . On Thursday, April 16, 2015 6:18 PM, "Stephen Richards okayjustalittle@... [cgs_synth]" wrote: There's a mod for ultra slow , normal and regular on Muffs posted by Fonik (Matthias) , easy to mak
2015-04-17 by Stephen Richards
There's a mod for ultra slow , normal and regular on Muffs posted by Fonik (Matthias) , easy to make on stripboard and installing the cap position on the board. Three caps and a switch pretty much. Found it ! http://modular.fonik.de/files/CGS_LFO_mod.jpg View on modular.fonik.de
2015-04-16 by Steve Inselman
Thanks, I haven't looked at the docs in years. I prob should've b4 asking. The speed is perfect. Thanks again! -Steve On Thursday, April 16, 2015 7:26 AM, "roglok@... [cgs_synth]" wrote: The mod is actually in the docs : to make it go slower, increase the 47nF cap in the integrat
2015-04-16 by roglok
The mod is actually in the docs : to make it go slower, increase the 47nF cap in the integrator.
2015-04-16 by Ove Ridé
Replace the 47n cap in the integrator portion with a higher value. Doubling the value should give you half the frequency. Obviously, use a 100n cap, not a 94n, assuming you can even find one. On 16 April 2015 at 15:53, steveinselman@... [cgs_synth] cgs_synth@yahoogroups.com > wro
2015-04-16 by steveinselman
Hello Ken and all, I wanted to drop one or both LFOs to about half speed or slower. Does anybody know which cap and components to change to achieve this? Thanks, -Steve
2015-04-08 by Ken Stone
Diodes and resistors are a anti-clipping limiter. They aren't needed. The LED was just a quick and dirty way to counter the inability of the op-amp output to go to the -VE rail. Other methods are also valid. Ken On Wed, Apr 8, 2015 at 11:35 AM, Sean Ellis tensiontype@... [cgs_syn
2015-04-08 by Sean Ellis
Hi! I'm looking at the schematics for the Cynare and noticed the original version has 2 back to back diodes and 2 resistors in a feedback loop for the envelope scale/invert section. These are missing from the Elby version of the circuit, what do they do to the envelope? I assume
2015-04-02 by Stephen Richards
Is there any advantage to changing the 10pF connected to the input section from Ceramic to higher quality ? From: "Stephen Richards okayjustalittle@... [cgs_synth]" To: "cgs_synth@yahoogroups.com" Sent: Thursday, April 2, 2015 1:04 PM Subject: Re: [cgs_synth] CGS 67 Active Real R
2015-04-02 by Stephen Richards
Thanks Ken. From: "Ken Stone otherunicorn@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Thursday, April 2, 2015 11:30 AM Subject: Re: [cgs_synth] CGS 67 Active Real Ring Mod V1.1 Mostly, unmatched diodes will cause bleed-through with no carrier input. There may be subtle h
2015-04-01 by Ken Stone
Mostly, unmatched diodes will cause bleed-through with no carrier input. There may be subtle harmonic differences too. On Thu, Apr 2, 2015 at 10:53 AM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hi Ken and all I was just wondering what exp
2015-04-01 by Stephen Richards
Hi Ken and all I was just wondering what experiences others have had with the CGS 67 Active Real Ring Mod V1.1? I built it almost 5 years ago and didn't really understand about matching at the time. Has anyone noticed performance differences between matched and unmatched diodes ?
2015-04-01 by vdmdav
Thankyou for the answer! Regards David
2015-04-01 by Loscha
Ken orders boards from a quality fab house. I don't recall hearing of any duds. Visually checking to make sure there are no bridges between IC pins is all I've ever done. On 01/04/2015 11:59 AM, " vdmdav@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Hello, I see in the cgs
2015-04-01 by cg_synth
You assume incorrectly. The only boards for which artwork is available have that artwork visible on the construction page, and that is for discontinued boards only. Not all commercially produced boards are perfect. These days it is very rare for them to stuff up, but in my time I
2015-03-31 by vdmdav
Hello, I see in the cgs website almost all the modules descriptions says the line: "Before you start assembly, check the board for etching faults. Look for any shorts between tracks, or open circuits due to over etching." So I assume there are some pcb layouts other than ordering
2015-03-16 by Stephen Richards
thanks Ken ! :P From: "Ken Stone otherunicorn@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Monday, March 16, 2015 2:19 PM Subject: Re: [cgs_synth] CGS 48 VCO question Keep looking for broken tracks then :) On Mon, Mar 16, 2015 at 1:49 PM, Stephen Richards okayjustalittle@
2015-03-16 by Ken Stone
Keep looking for broken tracks then :) On Mon, Mar 16, 2015 at 1:49 PM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hi Ken , No , Im not expecting it to be good ; ive seen it many times on mine but this sounds very different to the other VC
2015-03-16 by Stephen Richards
Hi Ken , No , Im not expecting it to be good ; ive seen it many times on mine but this sounds very different to the other VCO right next to it. Ive trimmed it to as good as i can get it. From: "Ken Stone otherunicorn@... [cgs_synth]" To: cgs_synth@yahoogroups.com Sent: Monday, Ma
2015-03-16 by Ken Stone
The sine wave is affected by that trimmer. Don't expect it to be particularly good. On Mon, Mar 16, 2015 at 1:09 PM, Stephen Richards okayjustalittle@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: It ended up being a broken track from the original builder , there is a whole l
2015-03-16 by Stephen Richards
It ended up being a broken track from the original builder , there is a whole lot of broken tracks and links on this board ; it was the one they missed. Now it's fixed , i've had a chance to look at the sine on the scope , the shape is all hills and no dales. Like a sine wave hal
2015-03-15 by jeremysfx
Thanks for all your answers. I'm putting in 5 because I'm building a Vintage Voltron panel and it is already laid out for 5. Thanks though Jeremy
2015-03-15 by bbob
for what its worth, i built several configurations of this, settled on 3 parallel with both individual outs and a mixer out with individual level controls for each band... i use it alot. for me, the bands were not narrow enough to justify 5 parallel bands. b
2015-03-15 by cg_synth
The 1.4 version is merely a double sided version of the 1.3. Because it is double sided, the links are not needed. There are pads marked +VE, 0V and -VE for connection between each other, and connection to the mixer.
2015-03-15 by jeremysfx
This is probably the better place to ask this question. I emailed Ken directly so sorry about that. Won't happen again. I will post my questions here from now on. I'm putting these together in a cascade setup identical to the image on the CGS site with the 5 bandpass filters conn
2015-03-13 by Stevie Richards
Thanks Ken Regards Stevie +61403329489 On 13 Mar 2015, at 5:16 pm, "Ken Stone otherunicorn@... [cgs_synth]" cgs_synth@yahoogroups.com > wrote: Check the 22k trimmer to the sine and saw/sine section is set. If that isnt' it, make sure you are getting a 5V sawtooth. Check the resis
2015-03-13 by Ken Stone
Check the 22k trimmer to the sine and saw/sine section is set. If that isnt' it, make sure you are getting a 5V sawtooth. Check the resistors around the area if you are not, in particular those associated with the 311 and the output TL072. Ken On Fri, Mar 13, 2015 at 5:09 PM, Ste
2015-03-13 by Stephen Richards
Hi Ken I have a CGS VCO that is not giving any output on the Saw to Sine and a very quiet output on the Sine out. Where else should i start looking ? CA3140 ? It's not the LM3900 , or BC547 is swapped those out already.
2015-02-11 by Laurie Biddulph
The important thing is to get a good electrical contact between the metal and 'grounding part'. Just relying on contact between say, a pot and the panel, is not guaranteed to provide an electrical path. Aluminium is a problem because it oxidises very quickly so it needs to be cle
2015-02-11 by yekuku
Thanks Laurie for sharing your wisdom ;) Scraping the back of the panel sounds like a good idea, I will do this on all my modules from now on.
2015-02-10 by Laurie Biddulph
If the back of the panel is not exposed metal then you should scrape at the back of the panel around the point where the pot body touches the metalwork to ensure a good electrical connection. Normal pot bodies are not connected to any of the pins so you may well find that there i
2015-02-10 by yekuku
I have just checked and although the panels dye is non conductive, the panel seems properly grounded 'through the potentiometers.