I just finished building this and it rocks! Nice breakup to full fuzz, it has it all. The bass and treble knobs are really functional and there's a nive volume boost in it.
Built it, controls working in the right direction, sounds great.
Lots of schematics available, I used this one: http://fuzzcentral.ssguitar.com/schematics/overdriverschem.gif
The collectors of Q2 and Q3 have to be biassed to approx. 5V. In my case, I replaced R5 with 2K and R12 with 2.6K (2.2K + 390R). I also used 2N2222A metal cans.
The gain pot is way more functional using a reverse log pot, the original has a linear pot. Without the rev log pot, the gain will be at the last 20% of the pot.
I also added an 1M pulldown resistor to prevent pops (R100), a low pass filter (R101/C4) to filter the power supply and a 100pF capacitor (C100) to filter radio frequencies. These can be omitted but I suggest you don't ;)
Bill of materials
|R16: 10K Reverse log (C)|
|R17: 100K Linear (B)|
|R18: 100K Log (A)|
|R19: 100K Linear (B)|
|1 jumper wires|
|14 trace cuts|
Click here to see the bill-of-materials as a list or download it as a comma separated values file (.csv).