Cgs synth

>Thanks Ken. I checked the resistor, and it's 22K. The cap is marked as

22nK63, but when I check it with the meter, it reads 37n. Seems wrong, no?

Close enough. There are other capacitances coming into play.

>Also, the replacement pots I used are 10K audio taper.

Try linear pots instead. Half of the log pot rotation gives 1/10th variation.
It whould improve somewhat with linear pots.

Ken

>
>
>
>--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>>
>> Short of you having the wrong part installed, somewhere, I'm not sure what
>> the problem would be. Connected the bases of the four transistors is a
>> resistor. Should be 22k or even 18k. Th capacitor across the op anp should
>> be 22n. If is possible it may be a 2n2 if you have one of the old boards.
>>
>> Ken
>>
>>
>> >So I replaced the two Rate pots and still have the same problem, which is
>> that the Rate pots don't start to do anything until 3/4 of the way through
>> the turn. I'm not a troubleshooting wiz, so I could use some direction.
>> >
>> >Between these pots and the output are the pairs of 3904/3906's and the )74
>> chip, and a handful of resistors; is one of these more likely to be causing
>> the problem than the other? Is there a measurement I can take to..ehmm...get
>> a clue?
>> >
>> >Thanks!
>> >
>> >
>> >
>> >--- In cgs_synth@yahoogroups.com, sasami@ wrote:
>> >>
>> >>
>> >> >I'm still working on mine. The rise and fall rate pots don't have any
>> >> effect until 3/4 of the way through the range. I know they are log. pots,
>> >> but that doesn't seem right?
>> >>
>> >> No, that doesn't seem right!
>> >>
>> >> Ken
>> >>
>> >> >
>> >> >
>> >> >--- In cgs_synth@yahoogroups.com, liam cloyd <liamcloyd@> wrote:
>> >> >>
>> >> >> glad you are making progress! any way you could post some close up

pics on

>> >> >> muffs so i can see the orientation and parts etc.
>> >> >>
>> >> >>
>> >> >> [Non-text portions of this message have been removed]
>> >> >>
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >------------------------------------
>> >> >
>> >> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >> >Yahoo! Groups Links
>> >> >
>> >> >
>> >> >
>> >> >
>> >> _______________________________________________________________________
>> >> Ken Stone sasami@ otherunicorn@
>> >> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>> >> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>> >>
>> >
>> >
>> >
>> >
>> >------------------------------------
>> >
>> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> _______________________________________________________________________
>> Ken Stone sasami@... otherunicorn@...
>> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>