[sdiy] Good precision pot choice for VCO CV panel tuning ??

Neil Johnson neil.johnson97 at ntlworld.com
Thu Sep 16 11:29:44 CEST 2010


Hi,

David G. Dixon wrote:
> No pot will be linear (no matter how expensive) if it's output isn't
> buffered before hitting a finite impedance, such as the input resistor to a
> summer.

General rule of thumb is that the wiper should see a resistance x10
that of the track resistance.  So if you have a 100k pot then you
should have 1Meg connection to the wiper.  Obviously higher is better,
offset by the problems inherent in high-impedance circuits.

Neil
-- 
http://www.njohnson.co.uk



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