Demo Tape Fuzz build question

[jonnygreentrees]

Just finished a Demo Tape Fuzz clone on a board from Jed's Peds and weirdly the gain/trim pot does full gain fully clockwise but also fully anticlockwise with different shades of gain in between. Is this normal?

[Betty Wont]

That's odd. I'm not familiar with that specific project, but that's not how the DTF works. You may have a solder bridge somewhere causing that, or a bum pot.

[jonnygreentrees]

cool will have a look for solder bridges and try a new pot

[juansolo]

Definitely not normal. Gain pot behaves as normal, though it only actually gets fuzzy right at the end of it. Also the vol has a HUGE amount of vol on tap. You'll barley turn the thing on and get unity.

[Boba7]

Oh yeah you definitely want a 100k log for volume. It has a LOT of volume on tap. The distortion only comes from the opamp.
A beautiful circuit.

[jonnygreentrees]

can't see any solder bridges, must be a duff pot

[Boba7]

I've never had a bad pot... Pretty sure it's something else. But you might be right.
I had never heard of thoses pcbs.
He seems to use some Madbean drawn schematics (as seen on the build doc of the Tape fuzz)

[Betty Wont]

I've never had a bad pot... Pretty sure it's something else. But you might be right.
I had never heard of thoses pcbs.
He seems to use some Madbean drawn schematics (as seen on the build doc of the Tape fuzz)

I agree it could be something else, but i have gotten a pot with a bad disc in it that behaved similarly. Its easy enough to test with a meter. I haven't heard of the vendor before either.

[jonnygreentrees]

just measured the resistance on the pot and I'm getting 03.3 ohm at both ends of the sweep on a 20k pot. Definitely something wrong with the pot