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Aion Electronics AURORA Manual

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PROJECT NAME
AURORA
BASED ON
Ross Compressor & MXR Dyna Comp
EFFECT TYPE
Compressor / Sustainer
PROJECT SUMMARY
The original guitar compressor, still a favorite of guitarists after over 40 years. The Aurora makes several
improvements to the original circuit as well as adding a few new features.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
AURORA COMPRESSOR/SUSTAINER
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2018-07-04)
1

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Summary of Contents for Aion Electronics AURORA

  • Page 1 1.0.0 (2018-07-04) PROJECT SUMMARY The original guitar compressor, still a favorite of guitarists after over 40 years. The Aurora makes several improvements to the original circuit as well as adding a few new features. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board).

  • Page 2: Table Of Contents

    This results in drastically reduced ripple (which is perceived as distortion on the otherwise clean signal). Some people like this distortion, so the Aurora was designed so you can still build the “stock” version and use the classic output stage. See the build notes for more details.

  • Page 3: Parts List

    Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Input pulldown resistor. Can be as low as 1M. LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. AURORA COMPRESSOR/SUSTAINER...
  • Page 4 BJT transistor, NPN, TO-92 2N5088 BJT transistor, NPN, TO-92 2N5088 BJT transistor, NPN, TO-92 Part of Q6 mod. See build notes. INPUT 100k trimmer Trimmer, 10%, 1/4" Allows the input signal to be attenuated for use with high input levels. AURORA COMPRESSOR/SUSTAINER...
  • 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. AURORA COMPRESSOR/SUSTAINER...

  • Page 6: Build Notes

    The default configuration of the Aurora is to use this Q6 mod. However, if you do want to build a fully- stock Ross or Dyna Comp, you can use a 47n film capacitor for CX1 and omit R22-24 and Q6.

  • Page 7: Schematic

    SCHEMATIC AURORA COMPRESSOR/SUSTAINER...

  • Page 8: Drill Template

    ø1/2” LEVEL SUSTAIN x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TREBLE RELEASE x: -0.85, y: +0.66 x: 0, y: +0.66 ø1/4” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” AURORA COMPRESSOR/SUSTAINER...

  • Page 9: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B AURORA COMPRESSOR/SUSTAINER...

  • Page 10: 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. AURORA COMPRESSOR/SUSTAINER...

  • Page 11: 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 (2018-07-04) Initial release. AURORA COMPRESSOR/SUSTAINER...