aion OCTAGON Manual
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aion OCTAGON Manual

Based on tycobrahe octavia
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PROJECT NAME
OCTAGON
BASED ON
Tycobrahe
Octavia
®
EFFECT TYPE
Octave fuzz
PROJECT SUMMARY
The very first octave-up fuzz effect, originally invented by Roger Mayer for Jimi Hendrix and later copied
by Tycobrahe for a commercial release.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
OCTAGON OCTAVE FUZZ
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2024-07-04)
1

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Summary of Contents for aion OCTAGON

  • Page 1 The very first octave-up fuzz effect, originally invented by Roger Mayer for Jimi Hendrix and later copied by Tycobrahe for a commercial release. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). OCTAGON OCTAVE FUZZ...

  • Page 2: Table Of Contents

    The transistor Octavia is available as our Octahedron project. The Octagon is a direct adaptation of the original Tycobrahe circuit, with the only addition being a toggle switch that disables the octave for a more traditional fuzz effect. USAGE The Octagon has two knobs and one toggle switch: •...

  • Page 3: Parts List

    The original Octavia used Ge diodes, but BAT46 will perform better. BAT46 Schottky diode, DO-35 The original Octavia used Ge diodes, but BAT46 will perform better. 2N3906 BJT transistor, PNP, TO-92 2N3904 BJT transistor, NPN, TO-92 2N3904 BJT transistor, NPN, TO-92 XFM1 42TM022 Transformer, 1.5KCT/600RCT OCTAGON 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. OCTAGON OCTAVE FUZZ...

  • Page 5: Build Notes

    Transformer selection The 42TM022 is a 1.5K:600R transformer available from Mouser. It has been used in almost every Octavia clone in the past 20 years and found to perform identically to the type used in the original. OCTAGON OCTAVE FUZZ...

  • Page 6: Schematic

    SCHEMATIC 100R 1N5817 100uF 100n 33uF 1N34A XFM1 OCTAVE 100uF 2N3906 150pF 2N3904 1N34A 42TM022 2N3904 GND GND 220uF GND GND OCTAGON OCTAVE FUZZ...

  • Page 7: Drill Template

    INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” VOLUME DRIVE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” OCTAVE x: 0, y: +0.66 ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” OCTAGON OCTAVE FUZZ...

  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B OCTAGON 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. OCTAGON 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. OCTAGON OCTAVE FUZZ...

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