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<TITLE>Trimming an Oakley MultiMix</TITLE>
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<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff size=2>best
would be pots that have not only center detent, but center
tap</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff size=2>i.e.
four leads. Then you ground the center tap and you have clean
zero.</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff size=2>You
could also solder trimmer pot to 'main' pot leads. The trimmer
value</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff size=2>should
be at least 10 times larger than the pot. e.g. 1M trimmer for 100k
pot.</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff size=2>I
usually solder one resistor to wiper and one of the ends. First I have
to</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff
size=2>experiment a little to determine it's value, but it's clean and
cheap.</FONT></SPAN></DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=538564408-18022002><FONT face=Arial color=#0000ff
size=2>Roman</FONT></SPAN></DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Rhen, Kris
[mailto:krhen@stucki.com]<BR><B>Sent:</B> Saturday, February 16, 2002 9:04
PM<BR><B>To:</B> 'synth-diy@dropmix.xs4all.nl '<BR><B>Subject:</B> [sdiy]
Trimming an Oakley MultiMix<BR><BR></FONT></DIV>
<P><FONT size=2>I'm looking at using Tony Allgood's MultiMix design from <A
target=_blank
href="http://www.oakleysound.com/multimix.htm">http://www.oakleysound.com/multimix.htm</A>
in a mixer I'm working on. However, for the reversible attenuator part,
I want to use center-detent pots for a nice clean zero. What would be
the best way to trimpot this circuit so that I can make sure my zeros are
zero? (yep I'm still a beginner :-) Any guidance would be
appreciated. Thanks all</FONT></P>
<P><FONT size=2>KRIS</FONT> </P><CODE><FONT
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