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Modifying Pot Resistance + Taper


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I needed a 25K pot for my buffered piezo circuit... RadShack didn't have that value (of course) and the music store only had 250K (of course).

Just for grins I tried a 47.5K resistor in parallel with the 250K to get a 39K pot. It does indeed change the value to 39K, but it's odd watching the resistance change through the sweep... it starts at zero, about halfway through the range it ramps up to 70K, then down to 39K.

I'm sure there's a mathematical explanation for this phenomenon... any of the experts want to chime in? :D

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