1978 IC Big Fluff Pie V4-5

The daddy of thick, meaty fuzz. Everyone needs some Fluff in their life.

This circuit is the V4-5 (V5 was a V4 + tone bypass switch - you can make either). A 70's experiment in emulating the Big Fluff Pie tone using op-amps rather than transistors resulted in this babe. It came kinda close, and in the process became its own sought-after sound. Similar territory to what you'd expect from a BMP, but with a heavy, grungy tone.

Check out the characteristic sound of it on Smashing Pumpkins' Siamese Dream.

Pads included to make modifications suggested by AnalogGuru, which make it slightly crunchier, but it sounds great stock. Don't mess!

For a great read on all-things-Fluff head over to Kit Rae's Page.

All this fuzzy fun in a 1590B enclosure. Fat Fluff in a skinny body. Sweet.

Optional tone-bypass switch is board-mounted for minimal wiring and easy enclosure mounting. The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.

If you want the PCB without parts there's a link for that at the bottom of the page.

Partial kit: PCB, all board-mounted components, pots.

Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.

Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included.

Builds are only available with full kits including enclosures. Please choose appropriate knobs.

Inspired by: Op Amp Big Muff Pi

Difficulty: Medium

PCB size: 50 x 40mm

Knobs required: 3

Enclosure: 1590B

Direct Connect compatible (4-way)

Download the INSTRUCTION PDF