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SUSTAINTONEVOLUME

1590B · 3 knobs

Effects Layouts (blog)

Electro-Harmonix Big Muff πVerified

Based on the Electro-Harmonix Big Muff Pi· 73 other boards clone it

Category
Distortion
Controls
Sustain · Tone · Volume
Build
Perfboard
Layout
Verified · Effects Layouts (blog) marks it as built and working
Tags
Distortion, Electro Harmonix, Fuzz, Project
Open the layout at Effects Layouts (blog) Big Muff siteEffects Layouts' BIG MUFF Project

From the post

I got a request for a layout of the Big Muff that could be used to build the Triangle, Rams Head, Green Russian, or NYC versions. While it shouldn't be that hard to take one of my previous layouts of the BMP and make the value changes, I thought I'd make a more detailed project than I normally do. First, let's start with the schematic. This is the basic circuit used by pretty much every variation of the Big Muff (excluding the IC Big Muff):

The only difference between versions is a handful of component values. Generally, the circuit was tweaked to work with whatever Mike Matthews had on hand. As a result, there are about 18 different variations produced by Electro-Harmonix. Now, not all of those variations sound all that good. But over the years several really good sounding Muffs have been traced and their component values posted on the web (mostly on Kit Rae's awesome Big Muff site). The 4 versions specified in this project seem to be some of the most popular and best sounding Muffs.

The component names in the schematic above correlate to this layout:

For a full BOM for all 4 versions, download the file linked below. In addition to the BOM, it contains scaled transfers for etching your own circuit board, as well as a scaled drilling template for building the effect into a Hammond 1590B enclosure.

Effects Layouts' BIG MUFF Project

If a BMP variation you want to build isn't specified in this project, use the above schematic and compare it to the schematic of your desired version to figure out what components go where.

Updated Sept. 2, 2015 to correct schematic, placement of Tone pot, and drilling template.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Effects Layouts (blog). No KiCad fragment has been drawn for this circuit yet.

Parts list 50 rows

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RefValueNormalizedTypeNotes
Resistors 24
R1??value not given; read from the layout by eye
R2??value not given; read from the layout by eye
R3??value not given; read from the layout by eye
R4??value not given; read from the layout by eye
R5??value not given; read from the layout by eye
R6??value not given; read from the layout by eye
R7??value not given; read from the layout by eye
R8??value not given; read from the layout by eye
R9??value not given; read from the layout by eye
R10??value not given; read from the layout by eye
R11??value not given; read from the layout by eye
R12??value not given; read from the layout by eye
R13??value not given; read from the layout by eye
R14??value not given; read from the layout by eye
R15??value not given; read from the layout by eye
R16??value not given; read from the layout by eye
R17??value not given; read from the layout by eye
R18??value not given; read from the layout by eye
R19??value not given; read from the layout by eye
R20??value not given; read from the layout by eye
R21??value not given; read from the layout by eye
R22??value not given; read from the layout by eye
R23??value not given; read from the layout by eye
R24??value not given; read from the layout by eye
Capacitors 14
C1??value not given; read from the layout by eye
C2??value not given; read from the layout by eye
C3??value not given; read from the layout by eye
C4??value not given; electrolytic; read from the layout by eye
C5??value not given; read from the layout by eye
C6??value not given; read from the layout by eye
C7??value not given; read from the layout by eye
C8??value not given; read from the layout by eye
C9??value not given; read from the layout by eye
C10??value not given; read from the layout by eye
C11??value not given; read from the layout by eye
C12??value not given; read from the layout by eye
C13??value not given; read from the layout by eye
C14??value not given; read from the layout by eye
Diodes 5
D1??value not given; read from the layout by eye
D2??value not given; read from the layout by eye
D3??value not given; read from the layout by eye
D4??value not given; read from the layout by eye
D5??value not given; read from the layout by eye
Transistors 4
Q1??value not given; read from the layout by eye
Q2??value not given; read from the layout by eye
Q3??value not given; read from the layout by eye
Q4??value not given; read from the layout by eye
Potentiometers 3
Sustain??Potentiometervalue not given; read from the layout by eye
Tone??Potentiometervalue not given; read from the layout by eye
Volume??Potentiometervalue not given; read from the layout by eye

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