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aion REFRACTOR Manual

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PROJECT NAME
REFRACTOR
BASED ON
®
Klon
Centaur / KTR
EFFECT TYPE
Overdrive
PROJECT SUMMARY
A part-for-part replica of a mythical overdrive effect noted for its high-end tone and price. The Klon
Centaur and its successor, the KTR, remain highly original designs in an industry full of clones and
tweaks to existing circuits.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
This documentation is for the PCB-only version of the project. If you are building the full kit from
Aion FX, please use the
may differ in some areas due to the specialized parts and assembly methods used in our kits.
REFRACTOR PROFESSIONAL OVERDRIVE
IMPORTANT NOTE
kit build documentation
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.3 (2024-08-08)
instead. The instructions are more detailed and
1

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Summary of Contents for aion REFRACTOR

  • Page 1 Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). IMPORTANT NOTE This documentation is for the PCB-only version of the project. If you are building the full kit from Aion FX, please use the kit build documentation instead. The instructions are more detailed and may differ in some areas due to the specialized parts and assembly methods used in our kits.

  • Page 2: Table Of Contents

    As of its release, the Refractor is the only DIY version of the Centaur or KTR that uses the correct true/ buffer switch wiring from the original unit. Several other projects use a simpler wiring method that does not preserve the original circuit in buffered mode, which was one of the inventor’s stipulations.

  • Page 3: Parts List

    560R Metal film resistor, 1/4W 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 Metal film resistor, 1/4W Input pulldown resistor for true bypass mode. REFRACTOR PROFESSIONAL OVERDRIVE...
  • Page 4 Operational amplifier, DIP8 TL072 Operational amplifier, DIP8 TC1044SCPA Charge pump, DIP8 Can also use LT1054. Better specs, but more expensive. IC1-S DIP-8 socket IC socket, DIP-8 IC2-S DIP-8 socket IC socket, DIP-8 IC3-S DIP-8 socket IC socket, DIP-8 REFRACTOR PROFESSIONAL OVERDRIVE...
  • Page 5 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. REFRACTOR PROFESSIONAL OVERDRIVE...

  • Page 6: Build Notes

    Cut a slot through the enclosure in this spot and you’ll be able to reach it. Be aware that this will require very precise measurements. It has not been tested, so Aion FX cannot offer any assistance or advice on how best to execute it.

  • Page 7: Schematic

    390pF 820pF 390n TRUE BYPASS / BUFFER SLIDE SWITCH VA: 9V PCB IN VB: 18V FROM BUFFER -VA: -9V 100uF 47uF SW1C VR: 4.5V 1N4001 1N4001 INPUT JACK SW1B 10uF LT1054 10uF OUTPUT JACK SW1A FROM EFFECT REFRACTOR PROFESSIONAL OVERDRIVE...

  • Page 8: Drill Template

    INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” VOLUME GAIN x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TREBLE x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” REFRACTOR PROFESSIONAL OVERDRIVE...

  • Page 9: Enclosure Layout

    It’s called a plated half-hole or castellated hole, and it’s used so that the PCB can lay flat across the pots instead of angling upward for the dual pot. Solder it like you would if they were normal pads, but bend the top pins forward slightly so they make contact with the edge of the pads. 125B REFRACTOR PROFESSIONAL OVERDRIVE...

  • Page 10: Wiring Diagram

    D.SW +V +V JACK GND JACK GND BUF 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. REFRACTOR PROFESSIONAL OVERDRIVE...

  • Page 11: Document Revisions

    Changed LEDR to 10k to work with a wider variety of LEDs. 1.0.2 (2018-10-24) Corrected a minor error in the schematic (not present in the PCB) and re-drew portions for clarity. 1.0.1 (2018-07-17) Added note explaining the plated half-holes used for the gain potentiometer. 1.0.0 (2018-07-04) Initial release. REFRACTOR PROFESSIONAL OVERDRIVE...

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