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2013-01-09 by sasami@hotkey.net.au
Swap the LF353 IC. See if the fault moves with the IC or stays where it is. Swap the transistors with a new set. Ken > >Ok, i tried the suggestion Gary gave me and unfortunately no luck but thank you for the useful tool. > >I'm completely in the dark at this point so i want to ex
2013-01-09 by adematteo
Ok, i tried the suggestion Gary gave me and unfortunately no luck but thank you for the useful tool. I'm completely in the dark at this point so i want to explain whats happening and maybe someone can have an idea as to what could be acting up. It will self cycle but only at it's
2013-01-07 by adematteo
Thanks Gary i'll give that a shot.Your right i did use lead free solder and it's very difficult to tell if you have a nice joint so this technique will be helpful. Thanks Ken but i've checked the wiring so many times i have it memorized. I'll report back when i get this bugger wo
2013-01-07 by Mongo
I have had trouble getting DUSGs to work as well, and there is a technique I've found that seems to help quite a lot. I print out the picture Ken has on the webpage that shows the PC board traces. I then sit down with that page, a highlighter, the pc board, and an ohmmeter, and I
2013-01-06 by sasami@hotkey.net.au
Check your wiring. Make sure you haven't got your pot and trigger wires swapped. Ken >Not sure if this is the best way to do this ? but figured if someone in the future searches better to have a few problems in 1 thread. > >Anyhow, i have 1 (1/2 of the board) of my dusg's working
2013-01-06 by adematteo
Not sure if this is the best way to do this ? but figured if someone in the future searches better to have a few problems in 1 thread. Anyhow, i have 1 (1/2 of the board) of my dusg's working perfectly and the other not working at all as expected. The problem is no recognition of
2013-01-06 by Steve Inselman
I finally put the capacitors in and it works perfectly. It has a strong punchy low end BD on either side all the way up to clicking popping sounds. I highly recommend the modifications for a more versatile twin-t drum module. 500k pots where the 470k resistor is for pitch adjustm
2013-01-06 by jk@jasonkahn.net
yes, absolutely! incredible patience and generosity. jason
2013-01-05 by adematteo
Awesome, i will seize the opportunity to echo these sentiments as well. Thanks so much to Ken for being so generous with his time and knowledge. --- In cgs_synth@yahoogroups.com , Tom Farrand wrote: > > Ken, > > I must say that I find your patience extraordinary. You are a first-
2013-01-05 by Richarius Molindarius
And much respect to Tom for that wonderful commentary in Ken's direction. :) I've been buying from Ken for ... what? 5 years now I think? He's always wonderful to deal with; helpful as heck with every single question that I've fired at him over the years; speedy in shipping and u
2013-01-05 by Tom Farrand
Ken, I must say that I find your patience extraordinary. You are a first-class person! I've seen a great many emails tossed at you lately and I am quite impressed at the volume of questions you get and the patience you clearly demonstrate. (I have a small handful of your boards a
2013-01-04 by blashol
hey ken; thx very much it makes sense now :) yeah it was writen "u1K100" and i red it wrong. thx for your help ;) --- In cgs_synth@yahoogroups.com , "cg_synth" wrote: > > > You can check the parts FAQ http://www.cgs.synth.net/modules/parts_faq.html > > What you've written is a li
2013-01-04 by cg_synth
You can check the parts FAQ http://www.cgs.synth.net/modules/parts_faq.html What you've written is a little confusing, but I think you have the right parts. u1 sounds to me like 0.1uf, or 100n. K is the tolerance. 100 is the voltage. In u1, the u is replacing the decimal point. u
2013-01-04 by blashol
Hi, i'm building the CGS58 ver1.1 i see on the pcb 100n (2 close to the 10uf capacitor) and one close to the TL072) in my modular chamber kit i got 3 1k100uF ..i'm not good at electronic but that really doesn't seem to match.but maybe i don't read the PCB right. are these 100nF c
2013-01-03 by sasami@hotkey.net.au
>Any one run into this problem ? >d The Smooth has nothing to do with L and S. That is the Stepped section. Unless there is a clock going into Sample (P), the stepped will not work. _______________________________________________________________________ Ken Stone sasami@... other
2013-01-03 by meech
Any one run into this problem ? d
2013-01-03 by Richard Brewster
LOL! I followed the PC board and used 1M for both. It can go too far wrong. Thanks, Richard On 1/2/13 5:40 PM, sasami@... wrote: >> This boils down to: Is the schematic correct? If not, then what's right? > God knows. No two of the bastards seem to be the same. Just build it as p
2013-01-02 by Richarius Molindarius
I always follow Ken's onkine pcb photo with its updates. Never a prob. there. Damn new job. :( i miss byulding. Ni time ti byild anyrhing niw. Damn phone kwybiard alsi. Lol On 2013-01-02 5:40 PM, sasami@... > wrote: ** >This boils down to: Is the schematic correct? If not, then w
2013-01-02 by sasami@hotkey.net.au
>This boils down to: Is the schematic correct? If not, then what's right? God knows. No two of the bastards seem to be the same. Just build it as per the PCB. Ken > >Thanks, > >Richard > >On 1/1/13 3:24 PM, Richard Brewster wrote: >> http://www.cgs.synth.net/modules/cgs113_vcm.ht
2013-01-02 by Richard Brewster
This boils down to: Is the schematic correct? If not, then what's right? Thanks, Richard On 1/1/13 3:24 PM, Richard Brewster wrote: > http://www.cgs.synth.net/modules/cgs113_vcm.html > > The third wave multiplier has one section where pin 8 of an LM3900 has a > 220K resistor comi
2013-01-02 by robert
Hi, As a last ditch attempt, I found a 3080 (metal can type) and replaced one on the board! Hey it works now In the Notch Hp and BP modes, I think the other 3080 goes to the LP which still does not work but I don't have a replacement for it! Now all I have to do is find three mor
2013-01-02 by sasami@hotkey.net.au
The only remaining think I can think of is for you to send it to me. Ken > >I put in 10 links (jumpers) Five in each filter. >Hope I didn't miss some. > >Robert > >--- In cgs_synth@yahoogroups.com , sasami@... wrote: >> >> I can't see anything wrong in what you have uploaded. Hav
2013-01-02 by robert
I put in 10 links (jumpers) Five in each filter. Hope I didn't miss some. Robert --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > I can't see anything wrong in what you have uploaded. Have you got all the > links in at the other end of the board? > > Ken > > > > >I posted
2013-01-02 by sasami@hotkey.net.au
I can't see anything wrong in what you have uploaded. Have you got all the links in at the other end of the board? Ken > >I posted two pictures in the album called CMOS, If they are not big enough let me know if I can e-mail them to you. > >THanks, Robert > > >--- In cgs_synth@ya
2013-01-01 by robert
I posted two pictures in the album called CMOS, If they are not big enough let me know if I can e-mail them to you. THanks, Robert --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > >Yes its the CD UB variant, Is there an easy way to test the LM3080? I got > mine from LB de
2013-01-01 by sasami@hotkey.net.au
>Yes its the CD UB variant, Is there an easy way to test the LM3080? I got mine from LB designs, I cant imagine they are all bad? I'm just looking for something wrong in both sections. >What should the voltages be on the LM3080 typically be? Pin 5 is at -5 and turning the freq po
2013-01-01 by robert
Yes its the CD UB variant, Is there an easy way to test the LM3080? I got mine from LB designs, I cant imagine they are all bad? What should the voltages be on the LM3080 typically be? Pin 5 is at -5 and turning the freq pot all the way it only drops to like -4.9? I am sure I hav
2013-01-01 by sasami@hotkey.net.au
>What is the CVSN for ? I did not connect it as I assumed it was optional for centring the freq pot. Control Voltage Summing Node. It is a point where more inputs can be added via extra resistors. >Any ideas? Did you swap out the LM3080? Is the CMOS chip OK? Is it the unbuffered
2013-01-01 by Richard Brewster
http://www.cgs.synth.net/modules/cgs113_vcm.html The third wave multiplier has one section where pin 8 of an LM3900 has a 220K resistor coming from the input buffer. It is shown on the schematic as having a feedback resistor to pin 9 of 1M, and an 820K to minus V. I am confused a
2013-01-01 by robert
Hi Ken, Thanks for your quick reply. I checked and rechecked all the components and I don't see any mistakes. Each section has two 557 transistors and one 547 transistor. I went with the orientation on the silk screen which is what is in the schematic. All the voltages components
2013-01-01 by robert
Hi Ken, Thanks for your quick reply. I checked and rechecked all the components and I don't see any mistakes. Each section has two 557 transistors and one 547 transistor. I went with the orientation on the silk screen which is what is in the schematic. All the voltages components
2012-12-31 by sasami@hotkey.net.au
It is probably a construction error cause by missidentified parts - the sort of thing that would cayse the same mistake to be made twice. Check that you have the correct transistors in each expo converter. There is an NPN an a pair of PNP in each. Get one in the wrong spot, and i
2012-12-31 by robert
Hello, I am having a problem with the CMOS filter. The frequency pot on either of the filters has no effect. The CV's input also have no effect. I have set the trimmers to the minimum setting and still no effect. A saw tooth wave at the input gives a saw wave at the HP and Notch
2012-12-30 by sasami@hotkey.net.au
Perhaps try a different TYPE of transistor. Ken >I'm running +/-15v. It is just a slight adjustment and it goes from minimal res to full on osc. >I placed all the diodes in as directed. I've been troubleshooting this one for weeks before I wrote. >I've tried everything I can thin
2012-12-30 by Steve Inselman
I'm running +/-15v. It is just a slight adjustment and it goes from minimal res to full on osc. I placed all the diodes in as directed. I've been troubleshooting this one for weeks before I wrote. I've tried everything I can think of. ________________________________ From: " sasa
2012-12-30 by sasami@hotkey.net.au
Resonance going out of control is a characteristic of the Sallen Key filter type, so that is to be expected. How many diodes do you have in your diode strings? What voltage are you running at? If you are running on +/-12 and have all the diodes in, you may have problems. Ken >Gre
2012-12-30 by grayz4sure
Here are the pin assignments: http://johnp.net/projects/guitar-synth/roland-pinouts.html#13pin I want to use TWO synth guitar pickups both sending 13 signals and be able to switch back and forth with a simple toggle between the two signals going into a single GR-20. any advice wo
2012-12-30 by Steve Inselman
Great, Thanks again Ken. I'll give it a shot. Hopefully I already have all the caps. As for the Stiener VCF, I put a 2k pot on the res and it is self osc at close to half way and beyond that it is out of control It is very touchy. It goes out of control a the slightest adjustment
2012-12-30 by richmolindarius@gmail.com
Aye. Fluke 83. On a couple of occasions outside of my ears, verified by my rack mount HP Freq. Counter.
2012-12-29 by sasami@hotkey.net.au
Double the value of the capacitor to halve the frequency = 1 oct down. So 1n > 4n7 and 10n > 47n will give a bit over 2 octaves down for the 'kick'. 470p > 2n2 and 4n7 to 22n will give a bit over 2 octaves down for the other. >Hello, >I have the twin-t drums with the res brought
2012-12-29 by Steve Inselman
Hello, I have the twin-t drums with the res brought out to the front panel and a 500k pot from the 470k resistor which has given me a range from kick all the way up to a popping click. The pitch goes from the unmodified state on up but my question is how to drop it a couple octav
2012-12-29 by Steve Inselman
Okay, I'll look them over again. Thanks Ken. ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Friday, December 28, 2012 2:39 PM Subject: Re: [cgs_synth] CGS35 Steiner VCF Check your capacitor and resistor values. You could hav
2012-12-29 by Richard Brewster
You've got a better frequency meter than the one in the cheap-o multimeter I use. Mine definitely distorts the signal. Richard On 12/28/12 8:51 PM, Richarius Molindarius wrote: > I dont think a 10 meg imp. is going to bother the measurement too much. > > On 2012-12-28 6:19 PM, "R
2012-12-29 by Richarius Molindarius
I dont think a 10 meg imp. is going to bother the measurement too much. On 2012-12-28 6:19 PM, "Richard Brewster" pugix@... > wrote: ** Easy, if you have a voltmeter. Listen to the output and add 1V to the CV input. If it jumps up an octave you've nailed it. Better yet use a freq
2012-12-28 by Richard Brewster
Easy, if you have a voltmeter. Listen to the output and add 1V to the CV input. If it jumps up an octave you've nailed it. Better yet use a frequency meter on the output. Sometimes I patch the output of a module I want to frequency check through a comparator (CGS quad logic works
2012-12-28 by meech
I think i have mine tuned to 1V/O with the CV pot at about 10 or 11:00 but how can I prove it ? d
2012-12-28 by sasami@hotkey.net.au
Check your capacitor and resistor values. You could have a wrongly placed part. Ken >Anyone know why my Synthacon VCF would have weak RES and FREQ? >The freq doesn't sound like it is opening up all the way and the res has minimal effect w/ no self osc. at all. > >I've replaced th
2012-12-28 by Steve Inselman
Anyone know why my Synthacon VCF would have weak RES and FREQ? The freq doesn't sound like it is opening up all the way and the res has minimal effect w/ no self osc. at all. I've replaced the transistors and quadruple checked my soldering and wiring. I've tried both -v and groun
2012-12-26 by adematteo
Ok so i got some trimmers and for some reason im getting a lower level rush of white noise on the vca's output every time the cv level goes low, no matter what i do i can't trim it out.I pulled the 5k trimmer (cv reject) and that got rid of it but i lose a lot of gain on the outp
2012-12-23 by adematteo
Thanks Ken, I just wired up the vca and it sounds good to me. I didn't match the bc548's so maybe i got lucky. I did match the dual npn's using the HFE test function. I don't have any trimmers yet so i'm hearing the thump of dc coming through but other than that the source signal