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aion HALO Manual
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aion HALO Manual

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PROJECT NAME
HALO
BASED ON
Electro-Harmonix Big Muff Pi
EFFECT TYPE
Fuzz / Distortion
PROJECT SUMMARY
One of the most classic guitar effects of all time, its sound falls somewhere between a distortion effect
and a fuzz with an incredibly long sustain.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
HALO DISTORTION / SUSTAINER
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
2.0.0 (2019-12-14)
1

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Summary of Contents for aion HALO

  • Page 1 One of the most classic guitar effects of all time, its sound falls somewhere between a distortion effect and a fuzz with an incredibly long sustain. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board). HALO DISTORTION / SUSTAINER...

  • Page 2: Table Of Contents

    It’s also a great way to experiment and learn how simple audio circuits work, because almost any part substitution will have some sort of audible effect. The Halo is a faithful recreation of the Big Muff, allowing any standard variant to be built. A versions...

  • Page 3: Parts List

    LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. 100n Film capacitor, 7.2 x 2.5mm 470pF MLCC capacitor, NP0/C0G 100n Film capacitor, 7.2 x 2.5mm 100n Film capacitor, 7.2 x 2.5mm HALO 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. HALO DISTORTION / SUSTAINER...

  • Page 5: Build Notes

    Kit Rae schematics into one reference so that you can easily retrieve a list of values for a particular variant and build the Halo to those specifications. Note that for all versions, the transistors, diodes and potentiometers are the same, so only the resistor and capacitor values are provided.
  • Page 6 As a result, the updated version of the Halo has been changed to have a 3-way switch that goes between the stock setting (scooped mids), a mid hump, or a fully flat frequency response. This gives a similar...

  • Page 7: Schematic

    Mid switch: 1 (A1-2, B1-2): Stock (Mid Scoop) 2 (A2-3, B1-2): Flat Mids 3 (A2-3, B2-3): Mid Hump 1N914 1N914 MIDS A 1N914 1N914 100n 100n 470pF 2N3904 470pF 470pF 470k 470k 470k 2N3904 2N3904 2N3904 HALO DISTORTION / SUSTAINER...

  • Page 8: Drill Template

    SUSTAIN x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” MIDS 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” HALO DISTORTION / SUSTAINER...

  • Page 9: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B HALO DISTORTION / SUSTAINER...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B HALO DISTORTION / SUSTAINER...

  • Page 11: Document Revisions

    The 3-transistor variant will be released as a different project in the future. • Changed default part values to “Gilmour” ‘73 Ram’s Head • Added versions spreadsheet with part references for 18 different variants 1.0.0 (2018-07-04) Initial release. HALO DISTORTION / SUSTAINER...