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Originally Posted by kaszeta
Cheap pots have a lot of problems. The big ones are drift and non-linearity. Minor problems include poor resolution and directional hysteresis (giving a different value whether you turned the pot CW or CCW to get there).
I've usually used fairly high-end ($11 or so) 10K pots from digi-key (look up part number 6639S). Good linearity, little drift. They are single turn with no stop (so they wrap around from 10 kOhm back to 0 ohm at 0 degrees), but other than that they've been very, very reliable.
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I was looking for a pot like that, though, the price seems kinda steep... anyone have another recommendation?
exactly what I was looking for was a continuous pot, 100k (for Operator Interface), it would only have to be accurate to 10 degrees or so...
also, to achieve 360 degrees with only 320 or whatever of effective electrical angle you could use two pots offset and sort it out with some good old fashion programing.