aion QUARK Manual
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aion QUARK Manual

Vintage overdrive
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PROJECT NAME
QUARK
BASED ON
Maxon
®
OD-880 Overdrive
EFFECT TYPE
Overdrive
PROJECT SUMMARY
An early overdrive circuit inspired by the MXR Distortion+, but incorporating a few changes that would
later evolve into the Tube Screamer a few years later.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.86" (bypass board).
QUARK VINTAGE OVERDRIVE
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2021-03-19)
1

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Summary of Contents for aion QUARK

  • Page 1 An early overdrive circuit inspired by the MXR Distortion+, but incorporating a few changes that would later evolve into the Tube Screamer a few years later. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board). QUARK VINTAGE OVERDRIVE...

  • Page 2: Table Of Contents

    And since the OD-880 lacks a tone control, a Treble switch selects between three different post-clipping hi-cut modes. The updated version of the Quark is the same as the original 1590B version, but with the addition of the Treble switch which the original Quark did not have.

  • Page 3: Parts List

    Part of treble mod. See build notes. Film capacitor, 7.2 x 2.5mm Part of treble mod. See build notes. Film capacitor, 7.2 x 2.5mm Part of treble mod. See build notes. 100n Film capacitor, 7.2 x 2.5mm Power supply filter capacitor. QUARK VINTAGE OVERDRIVE...
  • Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. QUARK VINTAGE OVERDRIVE...

  • Page 5: Build Notes

    It’s extremely subtle and has nearly no impact on the audio frequencies except at higher drive settings. QUARK VINTAGE OVERDRIVE...

  • Page 6: Schematic

    SCHEMATIC 100R 1N5817 100uF 47uF 100n LM741 LM741 LM741 100R 330n 820pF 100pF TREBLE 100k SENSITIVITY 500kB 100k QUARK VINTAGE OVERDRIVE...

  • Page 7: Drill Template

    -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” x: 0, y: +0.66 ø1/4” x: -0.775, y: +0.66 x: +0.775, y: +0.66 ø1/4” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” QUARK VINTAGE OVERDRIVE...

  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B QUARK VINTAGE OVERDRIVE...

  • Page 9: Wiring Diagram

    GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. QUARK VINTAGE 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 (2021-03-19) Initial release. QUARK VINTAGE OVERDRIVE...

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