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PROJECT NAME
FRACTAL
BASED ON
Pearl
®
OD-05 Over Drive
EFFECT TYPE
Parametric overdrive
PROJECT SUMMARY
A versatile overdrive with a single-band parametric EQ, allowing adjustable boost or cut from 100 Hz to
4kHz.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
FRACTAL PARAMETRIC OVERDRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2022-04-08)
1
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Table of Contents
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Summary of Contents for aion FRACTAL PARAMETRIC OVERDRIVE
- Page 1 Parametric overdrive 1.0.0 (2022-04-08) PROJECT SUMMARY A versatile overdrive with a single-band parametric EQ, allowing adjustable boost or cut from 100 Hz to 4kHz. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board). FRACTAL PARAMETRIC OVERDRIVE...
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Page 2: Table Of Contents
10 Document Revisions INTRODUCTION The Fractal Parametric Overdrive is based on the Pearl OD-05 Over Drive, a curiously obscure effect from the early 80’s when Pearl (yes, the drum company!) briefly dipped into the guitar effects pedal business. The result was a line of very well-engineered pedals that unfortunately never got the attention they deserved. -
Page 3: Parts List
Metal film resistor, 1/4W Input pulldown resistor. Can be as low as 1M. LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm FRACTAL PARAMETRIC OVERDRIVE... - 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. FRACTAL PARAMETRIC OVERDRIVE...
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Page 5: Build Notes
At zero, it’s identical to the stock circuit, so there’s no good reason to leave it off—but if you do want to omit it, use 10k for R24 and then jumper all three pads of the Tone pot together. FRACTAL PARAMETRIC OVERDRIVE... -
Page 6: Schematic
SCHEMATIC 470R 1N5817 100uF 100uF 100n 47uF GND GND IC2A IC1B JRC4558D IC2B 2N5088 JRC4558D JRC4558D 2N5088 IC1A 470R JRC4558D 2N5088 47pF 2N5088 220n 470pF 10uF 100kB DRIVE FRACTAL PARAMETRIC OVERDRIVE... -
Page 7: Drill Template
0, y: +1.71 x: +0.775, y: +1.71 ø9/32” ø9/32” ø9/32” VOLUME EQ GAIN x: -0.775, y: +0.41 x: +0.775, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” FRACTAL PARAMETRIC OVERDRIVE... -
Page 8: Enclosure Layout
Solder it like you would if they were normal pads, but bend the top pins forward slightly so they make contact with the edge of the pads. 125B FRACTAL PARAMETRIC OVERDRIVE... -
Page 9: Wiring Diagram
WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B FRACTAL PARAMETRIC OVERDRIVE... -
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 (2022-04-08) Initial release. FRACTAL PARAMETRIC OVERDRIVE...
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