aion POSITRON Manual
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aion POSITRON Manual

Preamp drive
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PROJECT NAME
POSITRON
BASED ON
Gorilla TC-35 Tube Cruncher
EFFECT TYPE
Overdrive/preamp
PROJECT SUMMARY
The preamp circuit of the Gorilla TC-35 amplifier adapted for use as an overdrive pedal.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.86" (bypass board).
POSITRON PREAMP DRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2020-06-05)
1

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Summary of Contents for aion POSITRON

  • Page 1 EFFECT TYPE DOCUMENT VERSION Overdrive/preamp 1.0.0 (2020-06-05) PROJECT SUMMARY The preamp circuit of the Gorilla TC-35 amplifier adapted for use as an overdrive pedal. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board). POSITRON PREAMP DRIVE...

  • Page 2: Table Of Contents

    Typically this is an undesirable characteristic that is avoided, but in this circuit it works. The Positron is an adaptation of the TC-35’s preamp section. It’s a direct clone of the circuitry based on factory schematics, running on the same voltage as the original, but meant to be used as a standalone drive pedal instead of a true preamp.

  • Page 3: Parts List

    Electrolytic capacitor, 6.3mm Negative supply filter capacitor. 470n MLCC capacitor, X7R Negative supply filter capacitor. MLCC capacitor, X7R IC1 positive supply filter capacitor. MLCC capacitor, X7R IC1 negative supply filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. POSITRON PREAMP DRIVE...
  • 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. POSITRON PREAMP DRIVE...

  • Page 5: Schematic

    SCHEMATIC 1N5817 100uF 100uF 100n TC1044SCPA BYP_GND PWR_GND PWR_GND 470n 100uF PWR_GND IC1A JRC4558D IC1B JRC4558D 100k 220pF 220n POSITRON PREAMP DRIVE...

  • Page 6: Drill Template

    -0.775, y: +1.71 x: 0, y: +1.71 x: +0.775, y: +1.71 ø9/32” ø9/32” ø9/32” VOLUME DRIVE x: -0.775, y: +0.41 x: +0.775, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” POSITRON PREAMP DRIVE...

  • Page 7: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B POSITRON PREAMP DRIVE...

  • Page 8: 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. POSITRON PREAMP DRIVE...

  • Page 9: 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 (2020-06-05) Initial release. POSITRON PREAMP DRIVE...

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