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For my MIDI controller project, I used a 10K potentiometer, thinking that was a high enough value. However, I realize now that ~3V from the CR2032 battery will drain V/R or 3/10000 or .0003 amps constantly. Being generous, and looking for round numbers, this will constantly drain a 300 mAh capacity CR2032 battery in .3 / .0003 = 1000 hours, or just over 41 days.
This isn’t an entirely unacceptable lifespan, but that’s before any of the other stuff gets factored in. I should have really considered this pot a bit more before purchasing it. That being said, what’s the disadvantage of using a 100k pot, or even a 1M pot? Are my math/assumptions correct? Guessing the voltage response might be slower.
Your math is correct. Using a 100K or 1M potentiometer would reduce current draw and extend battery life, but it might introduce noise and slow voltage response. If those aren’t major issues, a higher resistance pot could work well.
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