[sdiy] Audio bleed-thru on a minimoog...

[Gene Stopp]

Hi Grant,
 
Do you mean the 80 mic caps on the PS card? This makes sense if they have
gone open. It would also explain the fact that the VCF has no effect on the
background sound. Something to try!

- Gene

-----Original Message-----
From: Grant Richter [mailto:grichter at asapnet.net]
Sent: Monday, August 05, 2002 1:16 PM
To: Gene Stopp; 'synth-diy at dropmix.xs4all.nl'
Subject: Re: [sdiy] Audio bleed-thru on a minimoog...





This rules out misadjusted balance trimpots on the VCA's. I don't think
there's a trimmer that will solve this problem. Just tossing it around in my
head I am thinking that there may be a ground connection that's opened up.
Probably the first thing I'll do is get the scope out and probe all of the
pins along the bottom of the VCF/VCA card, ac coupled, high gain, to see
where the signal is coming from. I'll let you know what I find!!


Sounds like dried out power supply bypass electrolytics. This would be after
the voltage regulators. If the bypassing is bad the oscillators will appear
everywhere through the power supply rails.





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20020805/bf05a111/attachment.htm>