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PROJECT NAME
HELIODOR
BASED ON
®
BOSS
OD-3 Overdrive
EFFECT TYPE
JFET overdrive
PROJECT SUMMARY
The final entry in a series of legendary pedals using BOSS's "discrete op-amp" topology that overdrives
more like an amplifier than traditional drive circuits.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.86" (bypass board).
HELIODOR AMP OVERDRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.1 (2022-02-01)
1
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Summary of Contents for aion HELIODOR AMP OVERDRIVE
- Page 1 The final entry in a series of legendary pedals using BOSS’s “discrete op-amp” topology that overdrives more like an amplifier than traditional drive circuits. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board). HELIODOR AMP OVERDRIVE...
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Page 2: Table Of Contents
11 Document Revisions INTRODUCTION ® The Heliodor Amp Overdrive is based on the BOSS OD-3 Overdrive, released in 1997 as the successor to the OD-2r Turbo Overdrive. The OD-3 continues in the tradition of the OD-2/r and BD-2 Blues Driver with BOSS’s signature “discrete op-amp”... -
Page 3: Parts List
Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W 100k Metal film resistor, 1/4W Metal film resistor, 1/4W 100k Metal film resistor, 1/4W HELIODOR AMP OVERDRIVE... - Page 4 Power supply filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. 1N5817 Schottky diode, DO-41 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 HELIODOR AMP OVERDRIVE...
- Page 5 Switchcraft 111X 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. HELIODOR AMP OVERDRIVE...
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Page 6: Build Notes
All surface-mount JFETs use the same pinout, so this configuration will fit any type that we’re aware of. However, always check the datasheet if you’re uncertain—they’re difficult to desolder. Using through-hole adapters If you’re not confident in your ability to work with surface-mount parts, Aion FX offers 2SK209-GR JFETs (the SMD version of 2SK184-GR and 2SK117-GR) that come pre-soldered to adapters for use in through-hole designs. -
Page 7: Schematic
SCHEMATIC 1N5817 100uF 47uF 100n 2SK209-GR 2N3906 2SK209-GR Q3 Q4 47pF 2SK209-GR 470n 1N914 1N914 DRIVE 100kA IC1A JRC4558D IC1B JRC4558D 2SK209-GR 100k 10uF 2N5088 10uF HELIODOR AMP OVERDRIVE... -
Page 8: 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” TONE x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” HELIODOR AMP OVERDRIVE... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B HELIODOR AMP OVERDRIVE... -
Page 10: Wiring Diagram
WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B HELIODOR AMP OVERDRIVE... -
Page 11: Document Revisions
The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.1 (2022-02-01) Corrections to capacitors in parts list. C1 was listed twice, and the capacitor types were switched around. (All values were correct.) 1.0.0 (2021-11-26) Initial release. HELIODOR AMP OVERDRIVE...
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