aion Parhelion Manual
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aion Parhelion Manual

Vintage overdrive
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PROJECT NAME
PARHELION
BASED ON
Boss
®
OD-1 OverDrive
EFFECT TYPE
Overdrive
PROJECT SUMMARY
A precursor to the Tube Screamer, known for being the first overdrive effect to utilize diodes in a
negative-feedback arrangement for clipping purposes.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.86" (bypass board).
PARHELION VINTAGE OVERDRIVE
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.1 (2021-04-02)
1

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Summary of Contents for aion Parhelion

  • Page 1 A precursor to the Tube Screamer, known for being the first overdrive effect to utilize diodes in a negative-feedback arrangement for clipping purposes. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board). PARHELION VINTAGE OVERDRIVE...

  • Page 2: Table Of Contents

    EQ switch changes the gain structure of the op-amp clipping stage for higher gain and more bass. Note: The legacy 1590B version of the Parhelion was called the Corona. The updated version was given a new name upon release in 2021 for obvious reasons.

  • Page 3: Parts List

    Film capacitor, 7.2 x 3.5mm 100n Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm 47uF Electrolytic capacitor, 5mm Reference voltage filter capacitor. 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. PARHELION 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. PARHELION VINTAGE OVERDRIVE...

  • Page 5: Build Notes

    The original OD-1 used asymmetric clipping, with one diode in one direction and two in the other. An extra diode has been included on the Parhelion in case you want to experiment with other clipping options, but for the stock mode you will want to jumper D7.

  • Page 6: Schematic

    SCHEMATIC 100R 1N5817 100uF 47uF 100n IC1B LM348N IC1D IC1A LM348N LM348N 470R IC1C LM348N 1N914 CLIP 1N914 DRIVE PARHELION VINTAGE OVERDRIVE...

  • Page 7: Drill Template

    ø1/2” VOLUME DRIVE x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” CLIP x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø1/4” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” PARHELION VINTAGE OVERDRIVE...

  • Page 8: Enclosure Layout

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

  • Page 10: Document Revisions

    The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.1 (2021-04-02) Corrected D7 in parts list, which should be jumpered for the stock OD-1 circuit. 1.0.0 (2021-03-19) Initial release. PARHELION VINTAGE OVERDRIVE...

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