Schematic
BOM
R1
2M2
R2
3M3
R3
2K2
R4
1M
R5
1K
R6
22K
R7
2K2 (CLR)
C1
47p
C2
4n7
C3
100n
C4
470p
C5
10u elec
C6
47u elec
C7
2u2 elec
T1
4K7 Trim
Q1-2
BC109*
D1-2
1N4148
D2
1N4001
BODY**
100KA
VOL
100KB
CLIP**
5KB
*Other NPN transistors can be used. Experiment. 2N3904 and 2N3565 work well.
**BODY and CLIP are optional. If you prefer to keep to the original do the following:
TO OMIT BODY TO OMIT CLIP
•
Leave out C5
•
Leave out CLIP pot and place
•
Leave out BODY pot a jumper between pads 2 and 3
There are extra pads marked 1 and 2. These enable you to take the clipping diodes out of the
circuit altogether. To do that add a SPST or SPDT toggle switch. Connect one pad to the centre
lug, the other to either of the outer lugs (or the single outer lug if using SPST).
If you aren’t adding the switch, jumper pads 1 and 2 together.
Use the trimmer T1 to dial in the sweet spot. There’s no precise voltage to aim for - just adjust
until it sounds awesome.
