Search results

I've made a number of HPs with this schematic using pairs of R591/2N4401 and MP41/KT315. On both, the 680K feedback resistor on Q2 is less usable (to my ears). The "Fuzz" control is pretty neat, it acts both as a gain knob and in certain sweet spots can bring out subharmonics.

What would that even sound like? I'm not sure it's possible to get the biasing right. Well - maybe not true, I've found that the resistor going to the silicon (Q2) collector really can only be 91K in order for the circuit to act predictably in any way.

Yep, I definitely had those relay switches backward, the relay gets voltage in the "bypass" position. I must have gotten my eyes crossed when debugging this thing. Thanks so much!

That's what I initially thought, but using the DMM it's all good according to the schematic. I'm using an NA-5W-K.

Thanks so much for sharing this circuit, Chuck! I got this guy to work, however my LED is working backward (on when "bypassed"). Do you have an idea of where to start debugging that? I can't figure it out. I'm using an ICM7555.