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PROJECT NAME
PARTICLE
BASED ON
Interfax Harmonic Percolator
EFFECT TYPE
Fuzz / Overdrive
PROJECT SUMMARY
An obscure and very unique germanium fuzz/drive circuit from the 1970s, famously used and revered by
Steve Albini.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
PARTICLE VINTAGE FUZZ
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.2 (2022-09-20)
1
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Table of Contents
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Summary of Contents for aion Particle
- Page 1 Fuzz / Overdrive 1.0.2 (2022-09-20) PROJECT SUMMARY An obscure and very unique germanium fuzz/drive circuit from the 1970s, famously used and revered by Steve Albini. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board). PARTICLE VINTAGE FUZZ...
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Page 2: Table Of Contents
The Particle is an exact replica of the known schematics of the Harmonic Percolator, but with one addition. The Harmonic Percolator uses clipping diodes (unlike most germanium fuzzes) and so as with other Aion FX projects, we’ve added a diode switch to go between two different sets of diodes, or to disengage the diodes entirely. -
Page 3: Parts List
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. PARTICLE VINTAGE FUZZ... -
Page 4: Build Notes
Q1 silkscreen The initial release of the Particle (50 PCBs) had the silkscreen labels for Q1’s emitter and collector reversed. The left pad is the emitter and the right pad is the collector. The image on page 1 shows how it should be, labeled E-B-C, corrected in subsequent restocks. -
Page 5: Schematic
SCHEMATIC 1N5817 100uF 100n 2N3565 47uF 2N404A 100pF PARTICLE VINTAGE FUZZ... -
Page 6: Drill Template
INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” BALANCE HARMONICS x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” CLIPPING 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” PARTICLE VINTAGE FUZZ... -
Page 7: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B PARTICLE VINTAGE FUZZ... -
Page 8: Wiring Diagram
WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B PARTICLE VINTAGE FUZZ... -
Page 9: Document Revisions
The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.2 (2022-09-20) Revised build notes to include additional information on transistor selection. 1.0.1 (2021-03-14) Added note about Q1’s emitter and collector being mistakenly reversed on the PCB silkscreen. 1.0.0 (2021-02-19) Initial release. PARTICLE VINTAGE FUZZ...
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