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PROJECT NAME
OCTAHEDRON
BASED ON
Roger Mayer Octavia
EFFECT TYPE
Octave fuzz
PROJECT SUMMARY
An all-transistor redesign of the fuzz effect made famous by Jimi Hendrix, which adds an octave-up
overtone to the harmonics.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
OCTAHEDRON OCTAVE FUZZ
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2024-07-04)
1
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Table of Contents
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Summary of Contents for aion Octahedron
- Page 1 1.0.0 (2024-07-04) PROJECT SUMMARY An all-transistor redesign of the fuzz effect made famous by Jimi Hendrix, which adds an octave-up overtone to the harmonics. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). OCTAHEDRON OCTAVE FUZZ...
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Page 2: Table Of Contents
The Octahedron project is based on this version with the tone control, although the control can be omitted if you’d prefer to build the stock version. We have also included a switch to disable the octave- up effect and turn it into a more typical fuzz. -
Page 3: Parts List
MLCC capacitor, NP0/C0G 22uF Electrolytic capacitor, 5mm (omit) Film capacitor, 7.2 x 2.5mm 1n film capacitor for vintage version. 100n Film capacitor, 7.2 x 2.5mm 22uF Electrolytic capacitor, 5mm 22uF Electrolytic capacitor, 5mm Jumper for vintage version. OCTAHEDRON OCTAVE FUZZ... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. OCTAHEDRON OCTAVE FUZZ...
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Page 5: Build Notes
• C13: 100n → 10n • R5: omit → 220R • R17: omit → 100k • R18: 1M → 2M2 • R19: 1M → 2M2 • Volume: 100kA → 1MA • Tone: 50kC → omit and jumper pads 2 & 3 OCTAHEDRON OCTAVE FUZZ... -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 100n JUMPER 22uF 220R 1N914 OCTAVE 22uF 2N3906 MPSA13 MPSA13 TONE 50kC 470pF MPSA13 820k 1N914 GND GND 100n OMIT OCTAHEDRON OCTAVE FUZZ... -
Page 7: Drill Template
VOLUME DRIVE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE OCTAVE 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” OCTAHEDRON OCTAVE FUZZ... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B OCTAHEDRON OCTAVE FUZZ... -
Page 9: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. OCTAHEDRON OCTAVE FUZZ... -
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 1.0.0 (2024-07-04) Initial release. OCTAHEDRON OCTAVE FUZZ...
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