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Dirtbox Layouts

Electro Harmonix V1 Triangle Big Muff 66#5 - 1969 perfboard versionVerified

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

Category
Distortion
Controls
Sustain · Tone · Volume
Build
Vero· 19×17· 17 cuts, 5 links
Layout
Verified · Dirtbox Layouts marks it as built and working
Tags
Big Muff, Distortion, Electro Harmonix, Fuzz, MOJO
Open the layout at Dirtbox Layouts Schematic

From the post

Can't believe I haven't posted this one yet since it is one of the better vintage big muffs I built and played. In the very early days EH, component values varied quite a lot so this layout is based on Kitraes schematic HERE. There is also some notes and info the component values.

Trannsistors is 2N5133 which is almost impossible to source nowadays. Some Big Muff owners have measured their transistors (out of circuit) and reported those varied quite a lot but most of them were in the 150-300 hfe range. 2N2222, 2N3904 or BC547B might be good candidates but a personal favorite is ME4003. Here is two layouts, one standard and one "Triangle Style" mojo layout. Both are verified.

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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.

Parts list 24 rows

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Check before you build · 2 values the reader of this layout was not sure of
  • 4nF (film cap right edge, rows F-H): printed clearly, unusual value
  • 500pF (three ceramic caps): printed clearly, unusual value
RefValueNormalizedTypeNotes
Resistors 10
×4470K470kread from the layout by eye
×4100K100kread from the layout by eye
×410K10kread from the layout by eye
×3120Ω120read from the layout by eye
×239K39kread from the layout by eye
×227K27kread from the layout by eye
×136K36kread from the layout by eye
×12.2K2.2kread from the layout by eye
×11K1kread from the layout by eye
×11M1Mread from the layout by eye
Capacitors 7
×4680nF680nread from the layout by eye
×3500pF500pread from the layout by eye
×110nF10nread from the layout by eye
×16.8nF6.8nread from the layout by eye
×14nF4nread from the layout by eye
×41uF1uelectrolytic; read from the layout by eye
×1100uF100uelectrolytic; read from the layout by eye
Diodes 2
×4??D1-D4, value not given; legend: Small signal silicon diodes, V.D. 0,5-0,6; read from the layout by eye
D51N58171N5817read from the layout by eye
Transistors 1
×42N51332N5133Q1-Q4; legend: or other NPN Silicon, Hfe 200-800; read from the layout by eye
Potentiometers 3
SustainB100KB100kPotentiometerread from the layout by eye
ToneB100KB100kPotentiometerread from the layout by eye
VolumeB100KB100kPotentiometerread from the layout by eye
Switches 1
SwitchSPSTSPSTwired Switch 1 to Tone 3; read from the layout by eye

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