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<TITLE>Re: [sdiy] Audio bleed-thru on a minimoog...</TITLE>
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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=741553920-05082002>Hi
Grant,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=741553920-05082002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=741553920-05082002>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!</SPAN></FONT></DIV>
<P><FONT size=2>- Gene<BR><BR></FONT><FONT face=Tahoma size=2>-----Original
Message-----<BR><B>From:</B> Grant Richter
[mailto:grichter@asapnet.net]<BR><B>Sent:</B> Monday, August 05, 2002 1:16
PM<BR><B>To:</B> Gene Stopp; 'synth-diy@dropmix.xs4all.nl'<BR><B>Subject:</B>
Re: [sdiy] Audio bleed-thru on a minimoog...<BR><BR></P>
<BLOCKQUOTE></FONT>
<BLOCKQUOTE><BR><BR><FONT color=#0000ff><FONT size=2><FONT face=Arial>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!!<BR></FONT></FONT></FONT><FONT size=2><BR><BR>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.<BR><BR></FONT><BR></BLOCKQUOTE><BR></BLOCKQUOTE></BODY></HTML>