Electro-Harmonix Big Muff Pi Schematic and Component Table

EHX Big Muff Schematic 2082d0cd792f

I used Kit Rae schematics, but I did not follow the same component numbering, as I don’t find it all that intuitive.  Kit did it that way for a good reason, this way works better for my brain.  There’s also this excellent post by Kit Rae on the EHX forum, broadly describing differences between versions. … Read more

MXR: Distortion +

MXR Distortion Plus Vero Layout cdaf0b8722f9

Something of a classic and many other designs are based on the MXR Distortion + so no real need for an introduction. MXR DISTORTION PLUS – VERO LAYOUT DISTORTION PLUS ANALYSIS There’s an excellent analysis of the Distortion + here on Electrosmash including a schematic (be prepared for some maths) Note that I have used alternate pot … Read more

MUSITRONICS: Mu-Tron Micro V

MUTRON MICRO V STOCK V1a b6bec34f34ff

The Musitronics Mu-Tron Micro V is a cool old auto-wah / envelope filter from the seventies – I feel I need to be wearing a valour tracksuit, possibly with a half-unzipped jacket exposing generous chest hair with a gold dangler to really play this properly.  Maybe a moustache too…    I’ve used a LM13700 instead … Read more

GUILD: Foxey Lady, Point to Point and Vero Layouts (two knob version)

GUILD Foxey Lady P2P Layout 86a8c442d6d1

This is an early two knob Guild Foxey Lady, which is very similar to a silicon Mosrite Fuzzrite.  However it’s different to other schematics I have seen online –   I traced this from the circuit shown below – it’s easy to make out part values, excluding the pots and transistors.  I left some room for power … Read more

UNIVOX: UD-50 Unidrive, Point to Point Layout

UNIVOX Unidrive P2P Layout c223c1a473ad

Univox Unidrive boost with Aion FX mods The original Univox Unidrive was a straight boost, with a bit of dirt – it was a large rocker pedal with preset gain levels on a rotary switch, and the rocker controlled the output level, not unlike a regular volume pedal, but with the increased level of a booster.  The don’t … Read more

DEARMOND: Square Wave

DE ARMOND Square Wave Vero a00f671d79a9

The DeArmond Square Wave – it’s pretty much an MXR Distortion + with a couple of minor values changed.  It does come in a cooler-looking box…    There’s a great analysis of the Distortion Plus on Electrosmash, which will apply equally to the DeArmond Square Wave. DEARMOND SQUARE WAVE – VERO LAYOUT MODS The most obvious place to … Read more