This fuzz started out as as adaptation of a circuit I saw online that used a peizo mic for input to convert sound into light flashes. The schematic looked like it could easily be adapted to a guitar pedal with volume control, jacks, power filtering and polarity protection.
1. You can also use a 1N5817/100uF power filtering combo and will have a lower voltage drop across the 1N5817 in series (1). Be sure to not just sub the 5817 for the 4001 in this schematic, it won't work that way.
2. This fuzz is high gain, so one mod could be to add resistance to ground from Q2. This could roll back some of the harsh distortion with these high gain transistors. 330R-1K could be an option to start and you could also try adding a cap to ground - like at Q2 in the ToneBender - for extra crunch with the resistor in place(2). I am going to try this on a breadboard soon and will report back.
3. Changing to input cap (C1) to a higher value like 470nF or 1uF will allow for more bass frequencies to come through. C2 and C3 are adjustable as well.
4. Q1-3 can be almost anything with a higher gain - 2N5088, BC549C, etc.
5. POT1 can be adjusted to taste, a B500K might roll off some of the treble if the circuit is too "bright" with the A100K (no pun intended).
STRIPBOARD LAYOUT
This one is fairly simple, but depending on what enclosure you box it up in you may want to wire the LEDs off board. For my build I socketed them so I can just wire them up however I want in the end.
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