Thanks again Ken, and Rich for all the helpful suggestions.
I've triple checked component values at this point,replaced trannies,ic's,gone over continuity testing and visually inspected the board under a magnifying lens with no luck.
There has to be a short or something that i am just not seeing because i'm getting inconsistent results when i plug it in every time i make a change.I fried another lm3900 in the smooth section only this time it took a few minutes.I've been able to get a slewed/smoothed signal to pass but no control over the hold or rate, i've gotten a steady tone from plugging the cycle into the in of the smooth section but again no control to change the pitch and now i'm back to were i started with no effect and a strong negative voltage on the outputs ?
I'm gonna take a little break but at this point i'm seriously considering a do over.
Thanks again guys i really appreciate you taking the time to offer your time and experience !
I've triple checked component values at this point,replaced trannies,ic's,gone over continuity testing and visually inspected the board under a magnifying lens with no luck.
There has to be a short or something that i am just not seeing because i'm getting inconsistent results when i plug it in every time i make a change.I fried another lm3900 in the smooth section only this time it took a few minutes.I've been able to get a slewed/smoothed signal to pass but no control over the hold or rate, i've gotten a steady tone from plugging the cycle into the in of the smooth section but again no control to change the pitch and now i'm back to were i started with no effect and a strong negative voltage on the outputs ?
I'm gonna take a little break but at this point i'm seriously considering a do over.
Thanks again guys i really appreciate you taking the time to offer your time and experience !
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Been thinkng about this - The problem may also be caused by putting a
> voltage on the input pins, which are designed for current, not voltage.
> Check nothing is shorted to them. Check your resistor values. Maye sure you
> haven't installed 15 ohms instead of 1M.
>
> Ken
>
> >Will do.Thanks guys!
> >I'll report back when i get this working.
> >
> >--- In cgs_synth@yahoogroups.com, Richarius Molindarius
> <richmolindarius@> wrote:
> >>
> >> Use a well lit magnified lamp. Especially for that board. Hard to find
> >> small trace breaks and bad solder joints.
> >>
> >>
> >> [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/>
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>