[sdiy] Pots, cermet vs conductive plastic

[JH.]

>So, a cermet pot changes its total resistance less than a conductive
>plastic pot when the temperature changes.
>
>But if you connect it (ratiometrically) between two known voltages
>and just pick out a voltage in between, is there any difference
>between cermet and CP?

Depends on the load, i.e. on the resistor value from the pot's wiper to the 
virtual GND summing node, compared to the pot's own value.
The pot and the resistor will not have the same tempco, so there will be 
some temperature drift. High value for resitor and low value for pot will 
reduce this effect.

JH.