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PROJECT NAME
AURUM
BASED ON
®
BOSS
OD-2 Turbo Overdrive
EFFECT TYPE
JFET overdrive
PROJECT SUMMARY
The first in a series of legendary pedals using BOSS's "discrete op-amp" topology that overdrives more
like an amplifier than traditional diode-clipping circuits.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.86" (bypass board).
AURUM AMP OVERDRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2021-11-26)
1
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Related Manuals for aion AURUM
Summary of Contents for aion AURUM
- Page 1 The first in a series of legendary pedals using BOSS’s “discrete op-amp” topology that overdrives more like an amplifier than traditional diode-clipping circuits. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.86” (bypass board). AURUM AMP OVERDRIVE...
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Page 2: Table Of Contents
The Aurum is more specifically based on the “Turbo” mode of the circuit, adapting the OD-2r version of the circuit with the gain recovery stage and a couple of other minor tweaks. The non-”Turbo” mode is a completely separate drive circuit within the pedal, and generally speaking it’s unremarkable when... -
Page 3: Parts List
Metal film resistor, 1/4W Metal film resistor, 1/4W 680R Metal film resistor, 1/4W Metal film resistor, 1/4W 470k Metal film resistor, 1/4W Metal film resistor, 1/4W 100k Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W AURUM AMP OVERDRIVE... - Page 4 JFET, N-channel, SOT-23 Both originals use 2SK117-GR. 2SK209-GR is the SMD equivalent. 2SK209-GR JFET, N-channel, SOT-23 Both originals use 2SK117-GR. 2SK209-GR is the SMD equivalent. 2SK209-GR JFET, N-channel, SOT-23 Both originals use 2SK117-GR. 2SK209-GR is the SMD equivalent. AURUM 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. AURUM 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 2SK117-GR and 2SK184-GR) that come pre-soldered to adapters for use in through-hole designs. - Page 7 We only know this trimmed voltage wasn’t important enough to keep in the OD-2r. The improvements in the OD-2r make it the definitive version of the circuit, and it’s recommended to build the Aurum to OD-2r specs, which is the default configuration in the parts list. Building the original OD-2 If you want to build a straight OD-2, make the following changes.
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Page 8: Schematic
SCHEMATIC 2N5088 2N5088 1N5817 100uF 100uF 10uF 100n 10uF 47uF 10uF 47uF 2SK209-GR 2N3906 Q2 Q3 100pF 2SK209-GR DRIVE 250kA 100n 2N3906 Q5 Q6 100pF 2SK209-GR 10uF 270k 2N3906 150n 2N3904 2N5088 AURUM AMP OVERDRIVE... -
Page 9: 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” AURUM AMP OVERDRIVE... -
Page 10: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B AURUM AMP OVERDRIVE... -
Page 11: Wiring Diagram
WIRING DIAGRAM NC OUT GND +V +V JACK GND JACK GND GND PCB 125B AURUM AMP OVERDRIVE... -
Page 12: 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 (2021-11-26) Initial release. AURUM AMP OVERDRIVE...
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