Saturday, April 12, 2014

NPN Fuzz Face with BMP Tone Stack

This was a request but thought I may as well share it here in case anyone else wants something similar.  It's just a Fuzz Face with Big Muff tone stack which some may find useful, and can easily be adapted for a germanium build if you prefer.  I included a graph of the tone pot rotation frequency response thanks to the excellent Duncan Amps Tone Stack Calculator which I would recommend everyone use when working with the included tone stacks to fine tune the build to your own taste/gear.

I've put the 8K2 resistor to the far left hand side so if someone wants to add a trimmer to bias Q2, they can omit the resistor and add it in this position.  The trimmer legs may need a little fettling to span 4 rows but it should be easy enough to do.




And a second version with added base/collector Miller effect filter caps which cuts some high frequencies and makes it sound smoother and more like a germanium version.  Similar to the DAM Meathead.



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