Akashic Guitar effects circuit lookup
SUSTAINTONEVOLUME

Enclosure not stated · 3 knobs

Tagboard Effects

EHX 73 Rams Head Big MuffVerified

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

Category
Fuzz
Controls
Sustain · Tone · Volume
Build
Vero
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Electro Harmonix, Fuzz
Open the layout at Tagboard Effects

From the post

Another request, there you go Vince! :o) From a 1974 Electro Harmonix ad:

This fine distortion device is high on sustain and low on distortion. It is designed for the guitarist who wants his axe to sing like a hummingbird, with sweet violin-like sustaining sound. The sustain control allows you to optimize long sustain with a hint of harmonic distortion. Jimi Hendrix relied on the Big Muff for his smooth, mellow, supple Electric Lady sound.

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 Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 26 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • 4n left of the 12K in the centre of the board: printed clearly, unusual value
RefValueNormalizedTypeNotes
Resistors 9
×4100K100kread from the layout by eye
×333K33kread from the layout by eye
×13K33.3kread from the layout by eye
×3470K470kread from the layout by eye
×3100R100read from the layout by eye
×1820R820read from the layout by eye
×412K12kread from the layout by eye
×1390K390kread from the layout by eye
×27K57.5kread from the layout by eye
Capacitors 7
×6100n100nread from the layout by eye
×1150n150nread from the layout by eye
×210n10none on the board, one on the mids switch; read from the layout by eye
×14n4nread from the layout by eye
×14n74.7non the mids switch; read from the layout by eye
×3470p470pread from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
Diodes 2
×41N9141N914D1 to D4; read from the layout by eye
Dx1N58171N5817read from the layout by eye
Transistors 4
Q12N50892N5089legend: Transistors were 2N5133 which will be hard to source, try 2N5089, BC550C or similar; read from the layout by eye
Q22N50892N5089legend: Transistors were 2N5133 which will be hard to source, try 2N5089, BC550C or similar; read from the layout by eye
Q32N50892N5089legend: Transistors were 2N5133 which will be hard to source, try 2N5089, BC550C or similar; read from the layout by eye
Q42N50892N5089legend: Transistors were 2N5133 which will be hard to source, try 2N5089, BC550C or similar; read from the layout by eye
Potentiometers 3
SustainA100KA100kPotentiometerread from the layout by eye
ToneA100KA100kPotentiometerread from the layout by eye
VolumeA100KA100kPotentiometerread from the layout by eye
Switches 1
MidsDPDT on/off/onDPDT ON/OFF/ONtoggle, Scooped / Flat / Boosted mids, 3 pos DPDT; read from the layout by eye

Other boards based on the Electro-Harmonix Big Muff Pi