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Old 16th March 2005, 10:40 PM   #1
arjun is offline arjun  United States
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Default Paia Fatman Pot replacements

im building one of these suckers, and i know the pots that come with the kit are totaly flakey. anyone got any suggestions as to what to replace them with?
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Old 16th March 2005, 11:19 PM   #2
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Default POT

A good conductive plastic pots are the best. It the size that the issue. I guess your looking for a 500K pot, check out Clarostat Manufacturing Co.

Good luck
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Old 16th March 2005, 11:30 PM   #3
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If you need a pot with a gear, bgmicro.com has some Duncan's for cheap $.

If you are not actually worried about the pot breaking but just becoming noisy, you can build an opamp stage into the circuit to overcome that.
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Old 17th March 2005, 08:10 AM   #4
arjun is offline arjun  United States
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Quote:
Originally posted by leadbelly
you can build an opamp stage into the circuit to overcome that.

im kinda new to all this.. could you run me through exactly what your talking about?
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Old 20th March 2005, 10:23 PM   #5
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Quote:
Originally posted by arjun
im kinda new to all this.. could you run me through exactly what your talking about?
Sorry, I actually can't be much more help. I can generally describe the technique: basically, you take the scratchy pot out of the signal path by using it to drive the gain of a transconductance op amp instead. Unfortunately, the only OTA I'm 100% sure would work well in the 9V battery world of guitar pedals is the CA3080, and it is obsolete. I don't know of a replacement, although I'm sure somebody makes an OTA that will work, maybe not as spectacularly as the CA3080 with its +/- 2V minimum supply.
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