On Sun, 30 Oct 2011 21:47:34 -0700, DaveC wrote:

http://i43.tinypic.com/2hh3y12.jpg

Should all pots be log taper?

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The input pots, OK. The feedback pot, probably not.

Plot the change in output voltage as a function of wiper position to
get a better handle on it.

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JF