Sch BOM
R1
1M
R2
10K
R3
33K
R4
150K
R5
4K7
R6
22R
R7
1K
C1
10n
‡
C2
10n
‡
C3
Empty
C4
1n2
C5
22u elec
C6
15n
C7
100u elec
D1-2
BAT46*
D3
1N5817
Q1-3
Low gain NPN BJT**
BIAS
22K trimmer
FUzz
1KB
VOL
50KA***
*Original diodes are SA815. Try what you like here - they’ll make a big difference to
the feel of the fuzz.
**Aim for 200-250 for Q1, 300-350 for Q2-3. Originals used BC238B and BC239C.
We’ve designed the PCB to take both TO-18 and TO-92 packages. See page 6 for
orientation information.
**100KA works much better - honestly.
‡
If you want to beef up the sound, swap C1 and C2 for larger values, such as 47n.