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PROJECT NAME
CORVUS
BASED ON
EHX Big Muff Pi (1978 Op-Amp)
EFFECT TYPE
Fuzz / Distortion
PROJECT SUMMARY
The 1978 redesign of the classic Big Muff Pi, using op-amps instead of transistors. Famously used by
Billy Corgan on the Smashing Pumpkins album Siamese Dream.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
CORVUS DISTORTION / SUSTAINER
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.1 (2021-04-20)
1
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Table of Contents
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Summary of Contents for aion CORVUS
- Page 1 The 1978 redesign of the classic Big Muff Pi, using op-amps instead of transistors. Famously used by Billy Corgan on the Smashing Pumpkins album Siamese Dream. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board). CORVUS DISTORTION / SUSTAINER...
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Page 2: Table Of Contents
10 Document Revisions INTRODUCTION The Corvus Fuzz is a clone of the 1977-1980 “op-amp” EHX Big Muff Pi, a redesign of the classic Big Muff circuit using op-amps instead of transistor gain stages. It was designed by Howard Davis, a brilliant EHX engineer who also invented the Memory Man delay and Electric Mistress flanger as well as the Deluxe Big Muff Pi. -
Page 3: Parts List
Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 10uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm Modification; jumper for stock version. See build notes. Film capacitor, 7.2 x 3.5mm 330pF MLCC capacitor, NP0/C0G Film capacitor, 7.2 x 3.5mm CORVUS DISTORTION / SUSTAINER... - Page 4 Switchcraft 112BX or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. CORVUS DISTORTION / SUSTAINER...
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Page 5: Build Notes
The stock version of the Corvus uses this modified gain stage, so if you build it according to the parts list, it will have this improvement. However, if you’d like to build the stock version, you’ll want to do the following: •... -
Page 6: Schematic
SCHEMATIC 1N5817 100uF 100n 10uF 10uF LM741 560k IC1A IC1B RC4558P RC4558P TONE_BYP 330pF 330k 120n 470k 10uF CORVUS DISTORTION / SUSTAINER... -
Page 7: Drill Template
-0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE BYPASS TONE x: -0.85, y: +0.66 x: 0, y: +0.66 ø1/4” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” CORVUS DISTORTION / SUSTAINER... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B CORVUS DISTORTION / SUSTAINER... -
Page 9: Wiring Diagram
WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B CORVUS DISTORTION / SUSTAINER... -
Page 10: Document Revisions
(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.1 (2021-04-20) Corrected control labels on drill template. 1.0.0 (2020-11-16) Initial release. CORVUS DISTORTION / SUSTAINER...
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