aion COMET Manual
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aion COMET Manual

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PROJECT NAME
COMET
BASED ON
BOSS
®
DS-1 Distortion
EFFECT TYPE
Distortion
PROJECT SUMMARY
A classic distortion pedal that has been in continuous production for over 40 years, blending ideas from
the Big Muff, RAT and Distortion+.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
COMET VINTAGE DISTORTION
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2021-10-22)
1

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Summary of Contents for aion COMET

  • Page 1 A classic distortion pedal that has been in continuous production for over 40 years, blending ideas from the Big Muff, RAT and Distortion+. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). COMET VINTAGE DISTORTION...

  • Page 2: Table Of Contents

    The Comet is based on the dual op-amp version of the circuit. The default build makes a few parts substitutions to make it nearly identical to the pre-’94 circuit. If you want to use the TA7136P chip for an exact replica of the pre-’94 DS-1, the...

  • Page 3: Parts List

    Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 250pF Ceramic capacitor, X5F OMIT Use 100n for the Big Muff clipping mod. Leave empty otherwise. Film capacitor, 7.2 x 2.5mm 100pF MLCC capacitor, NP0/C0G 470n Film capacitor, 7.2 x 3mm COMET VINTAGE DISTORTION...
  • 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. COMET VINTAGE DISTORTION...

  • Page 5: Build Notes

    BUILD NOTES Pre-1994 version The default parts list for the Comet is for the pre-1994 version, the only difference being the op-amp since the original TA7136P IC is no longer produced and very hard to find. This involves changing three capacitors (C5, C6 and C7).

  • Page 6: Schematic

    SCHEMATIC 100R 1N5817 100uF 47uF 100n 250pF IC1A NJM3404AD 2N5088 IC1B 470k 100n 2N5088 250pF 2N5088 COMET VINTAGE DISTORTION...

  • Page 7: Drill Template

    VOLUME DISTORTION x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE CLIP x: 0, y: +0.66 x: +0.85, y: +0.66 ø9/32” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” COMET VINTAGE DISTORTION...

  • Page 8: Enclosure Layout

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

  • 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. COMET VINTAGE DISTORTION...

  • 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 (2021-10-22) Initial release. COMET VINTAGE DISTORTION...

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