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Originally Posted by phrontist
We've got three "1 Megohm" potentiometers, that we were planning to use to find arm position. If 1 Megohm = 1,000,000 Ohms will these work? I was under the impression we needed 100K potentiometers, which by my reasoning means we are a factor of 10 off. If these will not work, where can we get pots that will work today?
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Bjorn,
The 1M pot will give some indication of change but the input resistance of the RC and the pot value interact. The 1M may show some change but it might not be linear. (i.e. values per degreee of rotation will vary from one end of the pot to the other and may stop changing at some point) If you need linear, accurate data, stay with the 10K to 100K values.