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2015-02-10 by Laurie Biddulph
Have you tried grounding the front panel? Best Regards Laurie Biddulph Mobile: 0400 257 645 Phone: +61 (0)2 4340 0938 Web: www.elby-designs.com Skype: widgetoz Elby Designs 9 Follan Close Kariong NSW 2250 Australia On 11/02/2015 7:33 AM, ukukey@... [cgs_synth] wrote: > > > I have
2015-02-10 by yekuku
I have installed a trimmer and I have found out that with adding a 270Kohm resistor to the existing 100Kohm resistor (370Kohm in total) , the gain potentiometer works in full range :) thanks for pointing this out Richard :) Ken suggested that the previous range was "normal" behav
2015-02-08 by yekuku
Hi Richard and thanks for your input. Your suggestion sounds logical, I will install a trimmer and I will see how it goes.
2015-02-08 by Richard Brewster
I think I know the problem. The schematic shows the Initial Gain pot going to +15 volts and the resistor on the PC board is 100K. The CV input resistor is also 100K, which is for a sensitivity of full gain at +5V. I would have to look, but I think for my build I substituted a 270
2015-02-08 by yekuku
Hi Ken and thanks for your help. I have build a MOTM kit provided by Bridechamber where the optional initial gain pot comes standard. The gain control works from range 0 to 5 but from 5 to 10 it does not change the sound. I am not quite sure if I got the calibration right. I need
2015-02-08 by cg_synth
The optional initial gain pot? That sort of functionality is okay, as it allows you to compensate for negative CVs on the other inputs, such as when using LFOs that are centered around 0 volts. The hum would be related to your build. Perhaps using shielded wires on the signal inp
2015-02-08 by yekuku
Hi all, I have build one of these and I am not quite sure if it works right. The gain potentiometer works but I am getting full amplification when the pot is at half range, at the rest range there is no change in sound. Also a light 50hz hum is introduced while adjusting the gain
2015-01-29 by Ken Stone
I don't have current specifications, but none of them draw much. Does the fellow have a proper earth connection between the Serge and whatever he is connecting the output to? On Fri, Jan 30, 2015 at 7:45 AM, neil.a.Baldwin@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Thanks
2015-01-29 by neilbaldwin70
Thanks Ken Apparently the panel is the only thing connected to the supply (it's a Serge M-Boat with power) My power wiring is certainly as substantial as the supplied power cable/connector that came with the M-Boat. Are there any calculations regarding the expected current draw o
2015-01-28 by Ken Stone
Sounds like an overloaded power supply or too thin wires used to connect to the power supply to me. On Thu, Jan 29, 2015 at 9:08 AM, neil.a.Baldwin@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Hello all, I built a custom M-class style panel for a customer comprising of: Tri
2015-01-28 by neilbaldwin70
Hello all, I built a custom M-class style panel for a customer comprising of: Triple Comparator CGS96 Peaks and Troughs CGS84 Stompbox Adapter CGS60 Phaser CGS90 They're mounted and powered via two CGS91 mounting rails. I wired up the panel and tested it and all functions of the
2015-01-24 by Jon Nensén
Digging through an old box I found a PT2395 board. It’s fully populated and I think it works, but the last time it saw action was in 2009… Shoot me a mail off-list if you’re interested. Jon 24 jan 2015 kl. 12:00 skrev paulmorison@... [cgs_synth] cgs_synth@yahoogroups.com >: HI AL
2015-01-24 by Ken Stone
unless anyone has a second hand one, no. They've not been available for several years. Ken On Sat, Jan 24, 2015 at 10:00 PM, paulmorison@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: HI ALL Anyone know if there a pcb available for sale for this please? Thanks -- Ken Stone ot
2015-01-24 by paulmorison@btinternet.com
HI ALL Anyone know if there a pcb available for sale for this please? Thanks
2014-12-11 by Ken Stone
Hi Bbob, swapping the 2k2 and 1k would work. For the 680/820 pair, you will need to find a new ratio, as swapping them does not make a large enough difference. No changes are needed for the inputs. Ken On Fri, Dec 12, 2014 at 7:49 AM, fluxmonk@... [cgs_synth] cgs_synth@yahoogroup
2014-12-11 by data2action
looking to revise the sequencer/programmer to be compatible w/ 10v triggers. for the AEP and CPO pulse outs, i'm thinking i could just exchange the places of the 2k2 and 1k resistors, and get 10v pulse outs rather than 5... likewise with the individual stage pulse outs, swap the
2014-11-23 by djangosfire
Hi Ken, Wow, I missed your reply . . just found it today :) Thank you for the info! I'll give it a try !!
2014-09-28 by Ken Stone
The LEDs are used as diode isolation for the outputs. You need them, or a 1N4148 in their place. Add the bulb between the LED anode and 0V. The bulbs well see around one volt less than your power rail. (11V on a 12V system. 14V on a 15V system) On Sun, Sep 28, 2014 at 8:20 PM, ad
2014-09-28 by djangosfire
Getting ready to build an 8 stage CGS59 sequencer - is it possible to modify the circuit, and use incandescent bulbs in place of the LED's? Any pointers? Thank you for any ideas or advice to help make this work :) The bulbs I have right now are 16V .04A Best - Adam
2014-09-24 by cg_synth
For a 15V transformer, it should be much higher than that. I'd expect to see at least 18 volts across each.
2014-09-23 by soon.wazoo
Uhm! 11.28V across both: seems like the puppy's our first enemy, isn't it?
2014-09-23 by Ken Stone
measure the voltage across the large capacitors if it is above 15V on each, that is not your problem. On Wed, Sep 24, 2014 at 10:44 AM, soon.wazoo@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: Yep, but that's the strange part of it: best I can get is +9.80V or -9.80V. Might
2014-09-23 by soon.wazoo
Yep, but that's the strange part of it: best I can get is +9.80V or -9.80V. Might there be something strange goin' on at Graetz bridge or might it have something to do with the trafo (this one: Talema TRT30215 :: Talema Transformers :: Transformers :: Passive Components :: Electr
2014-09-23 by cg_synth
Now you adjust the trim pots until the voltages are correct.
2014-09-23 by soon.wazoo
(Sorry again for having shown such a lack of experience) It reads -8.8V and +11.08V , the PSU's being fed by a 220V/15V toroidal Talema trafo and by now both leds light up normally.
2014-09-23 by cg_synth
Black tip goes to 0V. Red tip goes to +12 (will read +12 on the meter). Black tip goes to 0V. Red tip goes to -12 (will read -12 on the meter).
2014-09-23 by soon.wazoo
(That's going to be extremely noob but :D ) you mean pointing the negative tip of the multimeter at the -12V tip and the positive at the +12? Should this be even more helpful: I tried connecting a VCO module to one of the sockets and feeding my soundcard directly with a square: n
2014-09-23 by cg_synth
Measure your outputs directly at the output sockets.
2014-09-23 by soon.wazoo
Hello everyone! I've just assembled a PSU66 and have followed this exact components' layout: http://cgs.synth.net/modules/pic/pcb_cgs66_psu.gif . The problem is: leds do light up normally but I'm measuring around 7.3V at the +12V pointing the negative tip at one of the 15V inputs
2014-09-06 by Dmitri SFC
Hahaha Rico Thank you for the klnd words! BUT this is Ken's list LOL Of course I will totally wire a PSU for you no problemo homey. Will follow up on FB. (sorry inbox is blowing up this month) Cheers d
2014-09-06 by Rico Loverde
hey Dmitri, do you happen to have any power supplies for sale. I need something that will power around 3 serge panels. i hate building power supplies, its the one thing i really don't like doing. sorry you've been catching so much drama. people can suck, and it all comes back to
2014-09-05 by Ken Stone
It seems to be manufacturer related. 7800 don't require ANY cap on the output according the the Motorola databook. I was taught the low impedance of the 100n was more effective than any electrolytic in that position. Of course, that doesn't mean it was right. I always found havin
2014-09-05 by Tom Farrand
Ken, I believe André is correct. The 1uF is suggested for the output in the datasheet, as is a 2.2 uF tantalum on the input side (22uF if aluminum electrolytic). I have found 7915s to be a bit fussy and years ago I didn't noticed that suggested arrangement to my chagrin and wanky
2014-09-04 by Ken Stone
No, 100n is correct. What makes you think it should be 1uF? On Fri, Sep 5, 2014 at 12:23 AM, Andre Majorel aym-htnys@... [cgs_synth] cgs_synth@yahoogroups.com > wrote: On 2014-09-04 06:45 -0700, otherunicorn@... [cgs_synth] wrote: > it's about 15ma per rail. If that is the only m
2014-09-04 by Andre Majorel
On 2014-09-04 06:45 -0700, otherunicorn@... [cgs_synth] wrote: > it's about 15ma per rail. If that is the only module you have, > you could run it on something like the CGS14 > http://www.cgs.synth.net/modules/cgs14_psu.html Ken, there may be an error in the schematic. The cap be
2014-09-04 by cg_synth
it's about 15ma per rail. If that is the only module you have, you could run it on something like the CGS14 (no PCB available) Ken Stone's Modular Synthesizer Descriptions of the various modules in a home built music synthesizer. View on www.cgs.synth.net Preview by Yahoo or some
2014-09-04 by hollispete
Hi Ken I am looking at supply options for the Steiner VCF. Do you know the current draw of a working PCB? Any recommendations on dual supply design, please? Thanks, Pete
2014-08-26 by Stephen Richards
Hey Dmitri , That happens on a couple of the pots on my MARSH , led's light up on the top two pots. Didn't check for voltage but the LED stayed on until i turned off the power. On Wednesday, August 27, 2014 10:18 AM, "Ken Stone otherunicorn@... [cgs_synth]" wrote: The things gate
2014-08-26 by Ken Stone
The things gate input pulls HIGH when nothing is plugged in, so it behaves as if it has a gate signal. -- Ken Stone otherunicorn@... Modular Synth PCBs for sale http://www.cgs.synth.net/ >
2014-08-26 by babyd_lhp
cgs116 to be clear
2014-08-26 by babyd_lhp
Anybody ever have a Serge Extended ADSR that works as expected BUT for some strange reason when you have nothing patched to start it , & you turn the sustain pot, it lights up & gives a voltage ?
2014-08-19 by valdemarkristensen
I somehow overlooked a solder bridge between ground and cycle out! Finally it's rocking!!Thanks Ken for making these wonderful modules available! Have a nice day! All the best, Valdemar Kristensen
2014-08-19 by ekkoflok
Hi all, The smooth section of my SSG is working beautifully. Unfortunately this is not the case for the stepped section. To make troubleshooting easier I've removed the connecting which turns the second smooth function into a stepped function. With cycle patched to IN a negative
2014-07-01 by kai kobi mikalsen
why don't you just use your amp on stage the engineers can mike it up and run it througt the PA then you also have control of your own monitoring... :-) kobi ----- Original Message ----- From: florisvanhoof@... [cgs_synth] To: cgs_synth@yahoogroups.com Sent: Tuesday, July 01, 2
2014-07-01 by sirolffoonav
Dear, I just posted this on Muffwiggler, while thinking of a solution I thought maybe the cgs tube vca can give a bit of the sound that I normally get from my amp. What do you think of this? Would it work as output module? thanks for the help! Floris I played live through all kin
2014-06-18 by zathrus1
I've spoken with Peter G about this, and it does indeed support all 3 modes. He did tell me not to get all excited about that - since there's no resonance circuit it won't make a huge difference. I do wish the schematic was available. I've never gotten my 2 copies of this board t
2014-06-17 by woof_dave
There's a small debate going on over on Muffwiggler about the modes of your LPG. We believe it runs as per most LPGs - i.e. the DPDT centre off switch is used to select either VCA, LPG (i.e. both) or VCF modes of operation. However, the chap who will be creating panels for this s
2014-06-05 by wahoo_yeehaw
Thanks always for the quick help. Can't wait to mangle some audio with this module!
2014-06-05 by cg_synth
If there are no +V or -V pads, yes, that is as good a place as any. Early versions of the board didn't have the extra +V or -V pads, so the rear of the power header was a convenient place to connect them.
2014-06-05 by wahoo_yeehaw
Not sure where to connect the +VE & -VE from (going to the freq & fine tune pots). Straight from the +/-15v power header?