Archive for April, 2014

Anti-Log Pot Chart

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For my projects, I usually only use audio (log) potentiometers.  The only problem with the taper of a log pot is that the last 1/4 of clockwise rotation changes values very quickly.  I’m working on a project where a 500k pot has 82k resistors on both outside lugs in series.  This reduced the total value to about 200k and the last part of the taper stayed within a few k-ohms of 200.  There just wasn’t enough of a difference for the pot to even be used beyond the 3 ‘o clock position.  I searched a bit and found some articles on how to change a linear pot to a logarithmic using resistors.  There was no information on adjusting a log taper, so I pulled out the DMM, some resistors, and went to work.

http://www.geofex.com/article_folders/potsecrets/potscret.htm

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