ToneTwEQ (solved)

[Anonymous]

I built a combo pedal with the Squishy Octo in front of the ToneTwEQ for my bass rig and everything works great except the high pot.  There is no perceptible change in the highs as I turn it from 0 to 10.  I put a new pot in thinking the pot might be bad but that didn’t change anything. Have you seen this before, how do I troubleshoot it and how can I fix it? I built everything to the BOM with the exception of C1 where I replaced the 220n with a 68n and C2 where I replace the 220n with a 100n which is how I understood it, in the build doc, to be for bass frequencies.

Thanks.

[wilkie1]

The C1 and C2 caps need to be 220n to allow all freqs to pass into the circuit.  the smaller values discussed were for guitars.  If you have the correct values for R5, R6 and C3 you should then hear changes in the Treble pot when playing higher notes on your bass,

[Anonymous]

That was the problem.  I replaced C1 and C2 with the cap values on the parts list and it works perfectly now.  Thanks!!

[Author]

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