EHX™ BIG MUFF PI™ (OPAMP) REPLICA COMPLETE KIT

A complete kit to build a replica of the op-amp version of the EHX™ Big Muff Pi™, the IC-based take on the classic sustaining fuzz.

About the effect

The Big Muff Pi™ is one of the best-known fuzz/distortion pedals, famous for thick, singing sustain. Most versions over the years were transistor-based, but there was also an op-amp (IC) version, and that's what this kit builds. The GGG Big Muff Pi™ project page covers the transistor versions first, with the op-amp version and its own documentation at the bottom of the page.

What you get

The kit includes all the parts and materials you need to build an EHX™ Big Muff Pi™ op-amp version replica, including the PCB.

Enclosure options:

• 125B: a standard-size pedal enclosure.
• 1590B: the smaller enclosure option.
• 1590BB: the larger enclosure option.
• No Enclosure: all the kit parts without the box, for builders who want to use their own enclosure.

Build resources

• Complete instructions for this kit (op-amp version is at the bottom of the page)
• Op-amp version bill of materials (PDF)
• Op-amp version schematic (PDF)
• Op-amp version parts layout and wiring diagram (PDF)
• 125B enclosure specification sheet
• 1590BB enclosure specification sheet (larger)
• General information about GGG kits

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