Turn a log pot into a (kind of) linear pot - diyAudio
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Old 12th October 2011, 10:56 AM   #1
diyAudio Member
Join Date: Jun 2011
Default Turn a log pot into a (kind of) linear pot

Hey there!

I made a terrible mistake in a circuit that I have to fix now: I ordered 250 wrong potentiometers (logarithmic scale) but they should be linear. Ordering new ones is not an option as this would take 8 weeks to wait for but we start production next week.

Is there ANY way of hacking a logarithmic pot into a linear-like one? The resistance value is 100K but I also wouldn't mind loosing part of this range, to like 50K or whatever.

Any clue anyone?

PS: Cross-posted this also on the electronics point forum for desperateness' sake...
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Old 12th October 2011, 11:28 AM   #2
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Join Date: Jun 2011
Mhm, thought I attach some more info: The log pot is actually responsible for setting the speed of a 555 timer (you know, between Trigger and Discharge). So maybe there are more possibilities of changing the logarithmic behaviour of the setup?
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Old 12th October 2011, 01:12 PM   #3
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Join Date: Nov 2008
Look at pix 3a and 3b, making a lin pot into "log". This should help you linearize your pot. E
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Old 12th October 2011, 01:24 PM   #4
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Thanks, mickymoose!, I know that trick already, works really nice But I want to perform the opposite: Converting a log pot into a lin pot...
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Old 12th October 2011, 01:40 PM   #5
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Join Date: Sep 2003
Location: Midland, Michigan
You can convert log to lin if you follow the "B" schematic.
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