Power supply: 10 ohm resistors are ferrite beads
D1 and D2 are Schottky diodes to prevent reverse voltage
After the diodes, beads and filtering caps, the +/-12V power goes to the op amps (2x TL074)
POT1 adjusts drive
POT2 adjusts diode clipping
POT3 adjusts tone
POT4 adjusts output level (trim pot)
D3 and D4 are 1N4148 diodes.
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