Cgs synth

>Are all your jacks grounded?

It's hard to ground a banana jack!!

Ken

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>--- On Sat, 9/1/10, Guy <guy@...> wrote:
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>From: Guy <guy@...>
>Subject: [cgs_synth] How to debug non-working modules...
>To: cgs_synth@yahoogroups.com
>Received: Saturday, 9 January, 2010, 11:08 PM
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> ...more specifically the Utility LFO, to start with.
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>Wired it up, with Join/Swap switches. +/-12V feed, banana jacks.
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>LEDs don't flash, but a quick DVM measuring at the outputs gives me app.

-4V on most and even -8V on some other outputs (the Vari's, I think). The
output voltages don't seem to fluctuate at all... (I did not do an audio
check, nor do I have a scope)

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>Apart from the obvious basic legwork (IC's put in correctly, no bad solder

joints, no short circuits at first sight, and that tricky little jumper is
present), what would be the methodology to start hunting for bugs ? Which
points should/could I measure first ? What would be good deductive steps to
undertake to pinpoint the problem ?

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