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2012-01-21 by Stephen Richards
Hi All I ran out of 200K 1% .25W Metal Film resistors. Can i use 200K 1% .5W Metal Film on the same board ? Generally speaking , does the wattage make a difference ? There are probably other times this will happen and i'd like to known what to do generally. thanks [Non-text porti
2012-01-16 by sasami@hotkey.net.au
47k, 150k, 470k, 820R 680R Cheers, Ken Ken >> As i mentioned earlier in the thread this is the old style boards (non RoHS), Just wondering at this point if there is a component value that might be incorrect on all 8 stage boards. >> > >okay, had an even closer look and i noticed
2012-01-16 by ch1nard
> As i mentioned earlier in the thread this is the old style boards (non RoHS), Just wondering at this point if there is a component value that might be incorrect on all 8 stage boards. > okay, had an even closer look and i noticed that H was only going up to 6.7v when pressing t
2012-01-15 by ch1nard
--- In cgs_synth@yahoogroups.com , sasami@... wrote: > Check the CPO circuit. That is the only other thing that is common to all > the push buttons. Make sure the capacitor there really is 10n and not 100n > or something like that. Maybe even try it without that capacitor. > > Ke
2012-01-15 by sasami@hotkey.net.au
>The buttons are still no go, checked the B line, and it WAS way below 7.5v due to the fact that i was trying to run it at 12v. >I reconfigured my power supply to run at 15v and B line now runs at 7.55v but still no dice with the buttons. >diodes all oriented correctly, no proble
2012-01-15 by ch1nard
sorry for the delay in trying this out I just went back and replaced all the transistors on both 2 and 3 stages and stepping now works in both directions. probably a bad one in there somewhere. The buttons are still no go, checked the B line, and it WAS way below 7.5v due to the
2012-01-10 by Stephen Richards
Thanks Ken and everyone else ! ________________________________ From: charles kerr thebadproducer@... > To: cgs_synth@yahoogroups.com Sent: Wednesday, January 11, 2012 10:23 AM Subject: Re: [cgs_synth] Ferrite Beads This might be of some interest! http://www.muffwiggler.com/forum
2012-01-10 by Romeo Fahl
I've used both 68 and 133 Ohm (@ 100 MHz) without problems. These are the Mouser parts that I usually order: 623-2743002112LF 623-2743001112LF RF On Tue, Jan 10, 2012 at 3:19 PM, Stephen Richards okayjustalittle@... > wrote: > ** > > > Hi Ken > > I bought some Ferrite Beads for B
2012-01-10 by sasami@hotkey.net.au
They are fine. Their DC resistance will still be 0 ohms. Ken >Hi Ken > >I bought some Ferrite Beads for BOCGS builds i'm doing in the next few months. > >I just wanted to make sure they were OK to use on your PCB's ; i know very little about differences in Ferrite Beads. > >They
2012-01-10 by charles kerr
This might be of some interest! http://www.muffwiggler.com/forum/viewtopic.php?t=49754 --- On Tue, 10/1/12, Stephen Richards okayjustalittle@... > wrote: From: Stephen Richards okayjustalittle@... > Subject: [cgs_synth] Ferrite Beads To: " cgs_synth@yahoogroups.com " cgs_synth@ya
2012-01-10 by Stephen Richards
Hi Ken I bought some Ferrite Beads for BOCGS builds i'm doing in the next few months. I just wanted to make sure they were OK to use on your PCB's ; i know very little about differences in Ferrite Beads. They are : 3.5 x 5 mm , 60 Ohm@ 1000Mz. I was a little worried the resistanc
2012-01-05 by Mongo
Hi - My good komrade Roman is trying to figure out a problem with his VCS card over on electro-music.com . Can someone please lend him a hand? I don't have one of these, so I have no idea what the problem is. Thanks Gary http://electro-music.com/forum/viewtopic.php?p=350362#35036
2011-12-30 by sasami@hotkey.net.au
I did adapt the 114 diagram from the 75, so that's probably how the error got there. Ken >Upon further inspection, I believe the source of this connection is CGS75, >where it simplifies the connection of the cycle switch, while probably not >affecting the normal function of the m
2011-12-30 by Ove Ridé
Upon further inspection, I believe the source of this connection is CGS75, where it simplifies the connection of the cycle switch, while probably not affecting the normal function of the module. There, this diode (*2) is connected after the resistors, and the PCB layout agrees. O
2011-12-30 by sasami@hotkey.net.au
If the PCB agrees with the other diagram, that means my diagram is incorrect. As simple as that. Ken >I'm currently designing a PCB based on CGS114 to suit my own needs. In >doing so, I've been studying both the schematic and PCB layout and >I've noticed a small difference betwee
2011-12-30 by Ove Ridé
I'm currently designing a PCB based on CGS114 to suit my own needs. In doing so, I've been studying both the schematic and PCB layout and I've noticed a small difference between the two. In the schematic, there's a diode that goes from the 33k resistor near trig in, directly to e
2011-12-28 by Stephen Richards
Cheers for both those answers Ken. ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Wednesday, December 28, 2011 6:15 PM Subject: Re: [cgs_synth] CGS09 Divider 50k is fine. Cheap trimmers are likely to have a tolerance of 20%,
2011-12-28 by sasami@hotkey.net.au
50k is fine. Cheap trimmers are likely to have a tolerance of 20%, so a "47k" trimmer could easily end up being 55k. The only significant difference between a 50k trimmer and a 47k trimmer is the series they come from. Some manufactures used to follow the fixed resistor values -
2011-12-28 by sasami@hotkey.net.au
Hi Stephen. Go for the 20k. These days I usually specify "20k, 22k or 25k". Tolerance is really sloppy on these, and being adjustable, it really doesn't matter. Also, it is used as a voltage divider across +ve to 0V, again making the exact value of little import. With the excepti
2011-12-28 by Stephen Richards
Actually i have the same question for this too . 47K single turn trimpot asked for , should i just go for a 50K ? If not what is the alternative here for both CGS77 and CGS09 questions. Stephen [Non-text portions of this message have been removed]
2011-12-28 by Stephen Richards
Hi Ken I'm putting together a BOM for the BOG panel and just wanted to ask about the Trimpot. I'm finding it very hard to find a supplier for 22 or 25K Single turn Vert. or Horiz. trimpots. When i built up the CGS77 PCB for the Best of CGS Panel #3 , i used a 20K Single turn Vert
2011-12-12 by derdoppledoppleganger
Ken, thanks so much! that did the trick. there was no connection to the common on the inside of the blacet power supply, all rockin! thanks so much! jim
2011-12-12 by derdoppledoppleganger
Ken, thanks so much! will try that out, thanks again, so much jim --- In cgs_synth@yahoogroups.com , sasami@... wrote: > > I suspect that INSIDE the blacet supply the 0 volt line is not connected to > ground. > The connection to mains earth is unimportant. It is the 0 volt lines
2011-12-12 by sasami@hotkey.net.au
I suspect that INSIDE the blacet supply the 0 volt line is not connected to ground. The connection to mains earth is unimportant. It is the 0 volt lines of all the panels that must be linked. Using "ground" to do it is just a convenient, but NOT foolproof way to do it. Find the 0
2011-12-12 by derdoppledoppleganger
Ken, thank you so much... problem is, I am in Japan, and there are no ground outlets here. the whole country is all 2 prong (and the east is 50hz). I have my whole serge, which is 16 panels, all grounded to the power supply, and that goes into the outlet, which is only 2 prong, b
2011-12-12 by cg_synth
It sounds like you don't understand the "grounding" issue. What needs to be connected to each synth is the zero volt line of the power supply. Often the zero volt line is also connected to ground in a power supply - but not always. I suspect this is one such case. Ken --- In cgs_
2011-12-12 by derdoppledoppleganger
Hi everyone.. i hope someone can help me with this. I just got a cgs swamp panel. This is my first time using cgs designs, so it may be something i just don't understand, but it won't talk to my serge or modcan panels at all. At first I thought it must be grounding because it had
2011-12-06 by Stephen Richards
Ok , cheers Ken Will post findings when i get a chance. ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Tuesday, December 6, 2011 6:42 PM Subject: Re: [cgs_synth] Sequencer Step 6 HOLD not working It sounds more like the swit
2011-12-06 by sasami@hotkey.net.au
It sounds more like the switch is shorted ON. Look around for a solder bridge or similar on the 6th board. Ken >Hi Ken > >Sequence will not jump to Step 6 when Button 6 is pressed. > >Here's what else i found : > >When the Seq is first powered up without anything patched ; step 6
2011-12-06 by Stephen Richards
Hi Ken Sequence will not jump to Step 6 when Button 6 is pressed. Here's what else i found : When the Seq is first powered up without anything patched ; step 6 is constantly lit. When something is patched to 'down' input (in this case the %2 out of the Pulse Divider) , the sequen
2011-12-06 by sasami@hotkey.net.au
Does it cause the sequence to jump to step 6 when pressed? If not, you have a bad button, a fault with one of the diodes it feeds, or a bad connection somewhere areound that area. Ken >Hi Ken/All > >I built the SWAMP panel and have found recently that the Step no 6 push button mo
2011-12-06 by Stephen Richards
Hi Ken/All I built the SWAMP panel and have found recently that the Step no 6 push button momentary switch will not halt the sequence when held down. All the other push button momentary switches do halt the sequence. This fault does not affect the sequencer's normal operation whe
2011-12-05 by cg_synth
As far as I can see, it is an unused op-amp, and the output of the other op-amp was just a convenient place to tie its input. --- In cgs_synth@yahoogroups.com , "matt39389" wrote: > > Looking at the schematics for the Dual Universal Slope Generator and noticed that the second LM3
2011-12-05 by matt39389
Looking at the schematics for the Dual Universal Slope Generator and noticed that the second LM3900 did not connect to anything at its output. I was curious about why this might be. Thank you! -Matt
2011-11-30 by cg_synth
First, check your "B" line is at 7.5 volts. If it isn't, that is why your buttons don't work. The B line puts the voltage on one side of the switches. Also check each push button connects to the cathode of its two diodes. As for the step 3 failure, the problem will be one board 3
2011-11-30 by ch1nard
I've been building a SWAMP pannel and i've pretty much got most of the CGS59 functions working with a couple of exceptions that i just cant seem to figure out. First is pretty easy to explain, pushbuttons dont seem to work. I've gone over all the buss connections plus double chec
2011-11-24 by Richarius Molindarius
I can't wait to order my first 2 of Ken's version of the DUSG. Great to read what you'd posted about it as well. -- Take care, Warmth and Peace, Rich http://www.damian.deathlehem.com/ - my modular synth http://deathlehem.com/php/ - The S0und 0f L0g1c - Lunetta / noise Forum (emai
2011-11-23 by Stephen Richards
Thanks Gary Sorry All , i should have just posted this to the Forum to begin with : http://www.muffwiggler.com/forum/viewtopic.php?p=495151&highlight=#495151 Cheers Stephen ________________________________ From: Mongo zathrus1@... > To: cgs_synth@yahoogroups.com Sent: Thursday, N
2011-11-23 by Mongo
Hi folks - I have been pointed to a thread on muff-wiggler that addresses this issue. The answer is to replace the 1k8 with a 1K fixed plus a 2K trimmer. Thanks Stephen! Gary --- In cgs_synth@yahoogroups.com , "Mongo" wrote: > > Hi, > > I've recently built my first DUSG module, a
2011-11-23 by Mongo
Hi, I've recently built my first DUSG module, and the only thing I'm having problems with right now is the '1V/Oct' tracking. I'm not expecting this to be as good as a normal VCO, but I'm finding that I'm not able to get this close enough to even track a single octave. If I want
2011-10-28 by sasami@hotkey.net.au
You can't guarentee what the diode drop will be - it will vary with current. You will also have the loading effect of the transformer coils on whatever you are driving, and unless it is very low impedance, you will lose there too. Ken >Hi Ken , thanks for your reply. I should hav
2011-10-28 by geoff james
Hi Ken , thanks for your reply. I should have mentioned that my soldering iron and test equipment are in storage , so i'm not able to buid the rrm or measure output.What other losses would you expect?Regardsgeoff To: cgs_synth@yahoogroups.com From: sasami@... Date: Tue, 25 Oct 20
2011-10-25 by sasami@hotkey.net.au
I can't tell you what the output will be because there will also be other losses in the system. It would be best to measure it. Ken >Hi All , have i got this right? >Using the RRM as a freq. doubler , if i have a 1V p-p signal at both the mod and carrier inputs and the schottky d
2011-10-25 by gff_ims
Hi All , have i got this right? Using the RRM as a freq. doubler , if i have a 1V p-p signal at both the mod and carrier inputs and the schottky diodes each measure 250mv forward voltage drop , will the ouput be 1volt p-p? Thanks in advance. Regards
2011-10-19 by sasami@hotkey.net.au
>Hi Ken > >Increased the size of the decoupling caps to 22uf and 220n , it had no effect on signal bleed problem. > >Would it be advisable to return these caps to their original values in this case ? Yes, you may as well. Ken ______________________________________________________
2011-10-19 by Stephen Richards
Hi Ken Increased the size of the decoupling caps to 22uf and 220n , it had no effect on signal bleed problem. Would it be advisable to return these caps to their original values in this case ? Stephen ________________________________ From: Stephen Richards okayjustalittle@... > T
2011-10-19 by Stephen Richards
Thanks , I'll keep the thread posted about how it goes. Stephen ________________________________ From: " sasami@... " sasami@... > To: cgs_synth@yahoogroups.com Sent: Wednesday, October 19, 2011 10:29 AM Subject: Re: [cgs_synth] Re: Best of CGS Panel #3 Oscillator signal bleed pr
2011-10-18 by sasami@hotkey.net.au
>Hi Ken > >This thread has got a bit bogged down in talking about Earth Connections in my Power Supply , sorry. > >Getting back to my original query...you suggested increasing the Decoupling Caps value. > >We are talking about the 10uf 35V x2 and the 100n x2 on each Oscillator ,
2011-10-18 by Stephen Richards
Hi Ken This thread has got a bit bogged down in talking about Earth Connections in my Power Supply , sorry. Getting back to my original query...you suggested increasing the Decoupling Caps value. We are talking about the 10uf 35V x2 and the 100n x2 on each Oscillator , yes ? Shou
2011-10-17 by Elby Designs
That link is there to connect the two grounds (0V and EARTH) together. In a `proper' system this should be linked as it keeps EVERYTHING at EARTH potential and electrically safe. This link can be removed or, better still, replaced with a resistor to help control earth loops but y