> > A 5k pot gives a 1.25k source impedance
>
> How did you arrive at that ?

Highest impedance is whiper in middle position, norton (or was it
thevenin?) equivalent is to parallel both 2.5k halves for a source
impedance of 1.25k.

Wouter van Ooijen

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consultancy, development, PICmicro products

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