Electro Harmonix Big Muff Pi Effect circuit diagram

The following diagram is the schematic diagram of electric guitar effect: Electro Harmonix (EH) Big Muff Pi.

Electro Harmonix Big Muff Pi Effect schematic

The EH Big Muff Pi would probably be better making the change by a modern input-jack power and a  DPDT bypass switch. The types of transistors and diodes are unknown. It is likely that any high gain NPN transistor and diode 1N914 will work. Coupling capacitors marked with * have been reported at its best if it has changed to 0.1uF and the capacitors marked with ** changed to 1.0UF. The original transistors were labeled SPT 87-103, and diodes of origin have been marked or 525GY or 523GY (difficult to read.)

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