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aion AURORA Manual

Based on ross compressor / mxr dyna comp
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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).
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.
AURORA COMPRESSOR/SUSTAINER
IMPORTANT NOTE
kit build documentation
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.1.1 (2024-12-04)
instead. The instructions are more detailed and
1

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Summary of Contents for aion AURORA

  • Page 1 1.1.1 (2024-12-04) 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 100R Metal film resistor, 1/4W Power supply filter resistor. 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

    Ross/Dyna specs, you can use a 47n film capacitor for CX1 and omit R22-24 and Q6. Release control The default configuration of the Aurora includes a “Release” control which is adapted from the Boss CS- 2. (Boss called it “Attack”, which is not entirely wrong, but it’s more accurate to say that it controls the release at the decay of the signal rather than the attack at the beginning.) When this pot is turned all the...
  • Page 7 Therefore, when designing the current version of the Aurora, we made the choice to design the PCB around the LM13700. It’s recently been discontinued in through-hole, but is still easy to find.

  • Page 8: Schematic

    SCHEMATIC IC1_BUF1 LM13700N 100R 1N5817 IC1B LM13700N 100uF 47uF 100n IC1_BUF2 LM13700N GND GND TREBLE 2N5088 2N5088 180pF 330pF 820pF 100n 2N5088 INPUT 100K IC1A 2N5088 2N5088 LM13700N 2N5088 10uF SUSTAIN 500KC 150pF GND GND GND GNDGND AURORA COMPRESSOR/SUSTAINER...

  • Page 9: 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 10: Enclosure Layout

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

  • Page 11: 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 12: Document Revisions

    • Reversed the direction of the Input trimmer so that there is no attenuation at zero and the attenuation increases as it is turned up. • Changed Level pot to audio taper (50kA). • Changed LEDR to 10k (lower current). 1.0.1 (2020-12-17) Added note about 150kC potentiometer availability. 1.0.0 (2018-07-04) Initial release. AURORA COMPRESSOR/SUSTAINER...