This unverified layout is based on this schematic by fredjuh.
R1: Bias resistor that controls clipping behavior.
R3: Bias resistor that controls clipping behavior and low frequencies.
R12: Bias resistor that controls clipping behavior and gain.
R15: Lower to 50K or increase to 220K. Major influence on clipping.
R14: Major influence on gain and clipping of the JFET.
C1: Low end amplification.
C2, R5: High pass filter. Decreases highs and mids to increase low response.
C3: Determines the "fizz" in the overdrive.
C10: High end amplification and gain.
For use with a clean amplifier: reduce C3. If your (tube) amp will oversaturate: remove C2 and R5.
Click here to see the bill-of-materials as a list or download it as a comma separated values file (.csv).
BB Forum code