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2014-01-05 by oivind60
Thanks for the quick reply. I say CGS75 in the topic. My mistake. It is of course the CGS76 One more question: Notes says if I run this on 15V I shall replace the marked 1K8 resistor with a 2K7 resistor. What about the 2K2 resistor. This resistor also have a * on the pcb
2014-01-04 by cg_synth
There is no need to change the voltage to the chip. Simply use the LM3900 as a direct replacement.
2014-01-04 by oivind60
I have a question about MC3401 vs LM3900. If I substitute the MC3401 with a LM3900, shall the LM3900 use the local 6V regulator? I run this on +/- 15V
2014-01-04 by freq63
Seeking a Swamp panel. The one with the unicorn.
2013-12-23 by Stephen Richards
Drokk !! Sorry Ken. I did not look at the actual link you gave me , that's much clearer. I'm sure i can sort it from there. Thanks and Happy Xmas to you and the Ponies. On Monday, December 23, 2013 10:23 PM, "sasami@..." wrote: Hi Stephen, not even close, I'm afraid. you are stil
2013-12-23 by cg_synth
Hi Stephen, not even close, I'm afraid. you are still trying to wire it as a processor. There are 47k and 150k resistors involved and you didn't even mention them. Pan pot wiper goes to ground. Follow the actual link I gave you and look at the diagram on that page. http://www.cgs
2013-12-23 by Stephen Richards
Hi Ken I have looked at the Schematic again and what i see it as , is : Banana > Gain Pot , wired as described in my last email > Wiper of Gain Pot via a 100K Resistor to Wiper of Pan Pot.> Pan Pot CCW to one side of the PCB Input.> Pan Pot CW to other side of the PCB Input ; bot
2013-12-23 by cg_synth
Look at the schematic. It's practically a wiring diagram. http://www.cgs.synth.net/modules/cgs81_mixer.html You will need extra resistors that will be mounted directly between the pots, at the panel. Ken >Hi Ken > >I have completed the COA panel #4 all except the CGS81 Panel Wiri
2013-12-23 by Stephen Richards
Hi Ken I have completed the COA panel #4 all except the CGS81 Panel Wiring. All clear sailing with everything working first time ; not calibrated yet. On the Output Mixer , I have wired only the CCW's (GND Bussed) and CW (Individual Panel Inputs on Each) for the Gain Pots. My que
2013-12-20 by Stephen Richards
I thought so , the person built these didn't install it. many thanks Ken On Friday, December 20, 2013 6:24 PM, "sasami@..." wrote: Yes, the link is required. Without it one of the chips won't get power. Ken >Hi Ken > >I'm just building up the Band Pass Filters on COA Panel #4. >
2013-12-20 by cg_synth
Yes, the link is required. Without it one of the chips won't get power. Ken >Hi Ken > >I'm just building up the Band Pass Filters on COA Panel #4. > >Can you please tell me , do the filters built up without power decoupling have to have the link installed ? > > > > > > > > >/* st
2013-12-20 by Stephen Richards
Hi Ken I'm just building up the Band Pass Filters on COA Panel #4. Can you please tell me , do the filters built up without power decoupling have to have the link installed ?
2013-12-06 by cg_synth
100k all round is the easiest. Ken >Hi Charlie, > > > Yes, it might very well be RB. My eyes are straining. The counts did suggest 100k, but I am guessing that since they are not labeled as such, there might be other options. I will probably just go with the 100k value. > > > Tha
2013-12-06 by acousmatique
Hi Charlie, Yes, it might very well be RB. My eyes are straining. The counts did suggest 100k, but I am guessing that since they are not labeled as such, there might be other options. I will probably just go with the 100k value. Thanks for the quick reply! CJ
2013-12-06 by charles kerr
Hi CJ, Do you mean RB? That is listed as 100k for the A board, and I would say 100K for the B board too, 100k all round! The circuit is very similar to the DC mixer - CGS 04... Charlie http://loudestwarning.tumblr.com/ -------------------------------------------- On Fri, 6/12/13,
2013-12-06 by acousmatique
I am building this for someone, and I don't see any formula for determining R8. Since the parts list says 8x 100k for each column, can I safely assume that 100k is the default value for these resistors? Do these set the gain for each amp? Thanks! Happy to be building again CJ
2013-12-02 by cg_synth
>Hi Ken and all > >Based on the input pin '1' being connected to the + rail on the 78L05 ; >after checking the pinout , i orientated my 78M05 with the face with the writing towards the power connector. >This puts input pin '1' in the same location as the 78L05. > That's correct.
2013-12-02 by Stephen Richards
Hi Ken and all Based on the input pin '1' being connected to the + rail on the 78L05 ; after checking the pinout , i orientated my 78M05 with the face with the writing towards the power connector. This puts input pin '1' in the same location as the 78L05.
2013-11-24 by Stephen Richards
Thanks Ken Regards Stephen On 24/11/2013, at 7:05 PM, sasami@... wrote: If you don't have an oscilliscope, fit C1. If you do, you can test the output to see if it is stable without C1. If it is oscillating, you would then need to fit C1. Basically, it's good practice to fit C1 ei
2013-11-24 by cg_synth
If you don't have an oscilliscope, fit C1. If you do, you can test the output to see if it is stable without C1. If it is oscillating, you would then need to fit C1. Basically, it's good practice to fit C1 either way. I left it as optional because it wasn't in the original. Ken >
2013-11-24 by Stephen Richards
One more thing on this. When do you install C1 ? Is it if you use a TL071 ? That is what I'm using as I don't have any LM307. Regards Stephen On 24/11/2013, at 5:23 PM, sasami@... wrote: TR2 and TR3 could be either 20k or 100k with no difference in behavior. I would use 20k for T
2013-11-24 by Stephen Richards
Great , thanks Ken Stephen On 24/11/2013, at 5:23 PM, sasami@... wrote: TR2 and TR3 could be either 20k or 100k with no difference in behavior. I would use 20k for TR1. Ken >Hi Ken > >I'm building the CGS 79 right now. > >I was just wondering which trimmer would be best to use to
2013-11-24 by cg_synth
TR2 and TR3 could be either 20k or 100k with no difference in behavior. I would use 20k for TR1. Ken >Hi Ken > >I'm building the CGS 79 right now. > >I was just wondering which trimmer would be best to use to replace the 25K in this case ? > >I have 20k or 100k. > >Best Regards >
2013-11-24 by Stephen Richards
Hi Ken I'm building the CGS 79 right now. I was just wondering which trimmer would be best to use to replace the 25K in this case ? I have 20k or 100k. Best Regards Stephen
2013-11-14 by Dmitri SFC
i just built one Stepped section OUT & IN ... I had the wires swapped ! All stepping now. d- --
2013-11-13 by Stephen Richards
I'll research more about it , thanks again Ken. On Wednesday, November 13, 2013 7:52 PM, "sasami@..." wrote: The 100n are simply across the power rails. For one of them to get hot, it would have to be a component failure. If that was the case, I would also expect it to affect oth
2013-11-13 by cg_synth
The 100n are simply across the power rails. For one of them to get hot, it would have to be a component failure. If that was the case, I would also expect it to affect other modules, as shorts on the power rails usually do. Looking at the photo again, are you sure you have a 47pF
2013-11-13 by Stephen Richards
Hi Ken , Dmitri and all I don't know why but after removing the L to S connection this time , the 100n Cap next door to the CA3080 didn't burn and the 'STEPPED' section is working finally. Apart from removing the L to S all i did was reflow a couple of resistor joints that looked
2013-11-12 by Stephen Richards
Ended up being a solder bridge between C and + buss wires , thanks Ken. Working fine. Now for the other Buss wiring... On Monday, November 11, 2013 4:04 PM, Stephen Richards wrote: I finished one side of the Programmer on the COA#3 panel , powered it up , then realised i had only
2013-11-11 by hiko_goldenballs
Hi. Having checked all the resisters and there wasn't any problem, I'm sorry but what I realised was simply sounds of beat frequency as I was trying to do tuning! Now all sounds seem fine. Sorry but thank you for your concern. Hiko ---In cgs_synth@yahoogroups.com, wrote: >One can
2013-11-11 by Stephen Richards
Thanks Ken , jeez i'm having a bad run lately. Need to take a break now and again ; tiredness induced construction errors no doubt. On Monday, November 11, 2013 4:30 PM, "sasami@..." wrote: The likelyhood is there is a short circuit on the stuck step PCB. Ken >I finished one side
2013-11-11 by cg_synth
The likelyhood is there is a short circuit on the stuck step PCB. Ken >I finished one side of the Programmer on the COA#3 panel , powered it up , then realised i had only connected the wipers on all of the pots (no CW , no CCW connected) on the last 'A' board before the 'B' board
2013-11-11 by Stephen Richards
I finished one side of the Programmer on the COA#3 panel , powered it up , then realised i had only connected the wipers on all of the pots (no CW , no CCW connected) on the last 'A' board before the 'B' board. I have since soldered all pot lugs. The panel isn't advancing when i
2013-11-10 by cg_synth
>One can't measure the resistance of a resistor when it's soldered in, Dmitri. :-) If you are doing a comparison with another board, you can. You ignore the value on the resistor, and compare it with the same resistor on the other board. :-) > > >---In cgs_synth@yahoogroups.com ,
2013-11-10 by hiko_goldenballs
I'll try to measure all the registers as I'm still working on a solderless bread board. Thanks Dmitri ---In cgs_synth@yahoogroups.com, wrote: pul lthe COA #2 panel out of the boat, put the two panels side by side on the bench & compare the two SSG boards with a meter. First test
2013-11-10 by gddfp
One can't measure the resistance of a resistor when it's soldered in, Dmitri. :-) ---In cgs_synth@yahoogroups.com, wrote: pul lthe COA #2 panel out of the boat, put the two panels side by side on the bench & compare the two SSG boards with a meter. First test all the resistors wi
2013-11-10 by Dmitri SFC
pul lthe COA #2 panel out of the boat, put the two panels side by side on the bench & compare the two SSG boards with a meter. First test all the resistors with OHM meter, in the process , you will find the bug. Excuse me if you already did that. d
2013-11-10 by Stephen Richards
Cheers Scott ! I'll have a look. On 10/11/2013, at 8:10 PM, Scott Young thebot@... > wrote: Only thing that I can see from the photos is a bit of discolouration around the 220n next to the PN4250 / CA3080. Probably nothing but would be worth checking for continuity on the parts r
2013-11-10 by Stephen Richards
Looks like that's what Dmitri intended , which I didn't know until last night. I'm suspicious of one of the J201 legs as I found a bit of what looked like a ice of track on it. Going to check it when I get home. On 10/11/2013, at 3:11 PM, sasami@... > wrote: From the photos it lo
2013-11-10 by Scott Young
Only thing that I can see from the photos is a bit of discolouration around the 220n next to the PN4250 / CA3080. Probably nothing but would be worth checking for continuity on the parts round there. It's nice tidy work so the only thing I can see being an issue is where you've h
2013-11-10 by hiko_goldenballs
Hi Ken and everybody. I'm now working on CGS 48 VCO. I'm now just working it on a breadboard. Having constructed everything, it seems working but the voltage of SQ and Saw out seems a bit too much. These are the voltage of output simply I measured with a meter. SQ Out : AC 4.30V,
2013-11-10 by cg_synth
From the photos it looks okay to me. It's hard to tell on the track side for obvious reasons. Have you tried to simply get it to work as a Smooth, by leaving out the link between L and S? ---In cgs_synth@yahoogroups.com, wrote: Photos are up ! On 09/11/2013, at 9:28 PM, Stephen R
2013-11-10 by Stephen Richards
Photos are up ! On 09/11/2013, at 9:28 PM, Stephen Richards okayjustalittle@... > wrote: I'll try and get some photos up. I have desoldered a few components a few times the reversed BC557 and the J201 and a few wires.y wiring is a bit hackneyed as I use a larger gauge wire than t
2013-11-09 by Stephen Richards
Thanks D The time difference is a bit killer and i started on my COA #3 today to get my mind off it all. I'll take some photos in the morning. In around 9 hrs or so. Maybe check back around 4 or 5pm Cali time. If i can't upload pics to this forum , i might take it over to muffs.
2013-11-09 by Dmitri SFC
The wire/jumper between L & S pads should make the bottom section seem like it doesnt work at all, until you feed it that high Coupler output (while patched to cycle). When the L to S jumper is not installed the bottom section should Cycle at audio range like the top section does
2013-11-09 by Stephen Richards
I'll try and get some photos up. I have desoldered a few components a few times the reversed BC557 and the J201 and a few wires.y wiring is a bit hackneyed as I use a larger gauge wire than the anchor holes allow but it's never really caused me grief and I've built 6 of these pan
2013-11-09 by Scott Young
As Neil said pictures would definitely help. Looking at the data sheets the BC557 should be reversed as the pinouts are the other way about to the PN4250. The issue with the 100n is strange but they are close on the board and also to the BC557 - did you initially have the BC557 t
2013-11-09 by Neil Baldwin
Could you take a high resolution photo of the front and back side of the board and upload them to the group or to a photo service such as Flickr? On 9 Nov 2013, at 06:55, Stephen Richards okayjustalittle@... > wrote: Hi Ken and all fellow CGS/Serge builders , I've literally been
2013-11-09 by Stephen Richards
Hi Ken and all fellow CGS/Serge builders , I've literally been trying to get the Stepped part of the SSG , in my VV1 Serge Panel (dmitri panel #1) , going for more than a month to no avail. It's become all i do when i get up in the morning , every day. I'm becoming burned out. I
2013-11-03 by Elby Designs
The LEDs are 3mm and 5mm and you buy the colour that is required (Red, Green, Yellow etc). You then either but White (clear) lens mounts to allow the LED body colour itself to come through or same colour lens mounts as the LEDs they fit. In my kits I supply clear lens mounts and