Aion Electronics AURORA Podręcznik - Strona 2

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TABLE OF CONTENTS

1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Aurora Compressor/Sustainer is an updated version of the MXR Dyna Comp and the Ross
Compressor. One of the first compressor circuits designed for guitar, the MXR Dyna Comp has been a
consistent favorite among guitarists, and the circuit is legendary in the DIY community.
The Ross Compressor was an updated clone of the Dyna Comp that got a lot of attention when it was
"rediscovered" in the 1990s by Trey Anastasio of Phish. It has better power supply filtering and thus
lower noise, but is otherwise very similar to the Dyna Comp.
The Aurora takes things a step further by adding a couple of modifications. First, the obsolete CA3080
has been replaced by the LM13700, which is essentially just a dual CA3080 but with the advantage of
still being in production and easy to find.
The output section has also been modified to take the signal from a different part of the envelope
detector. 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.
USAGE
The Aurora has the following controls:
• Sustain controls the amount of compression. As you turn it up, it increases the sustain but also the
noise level. If you keep it down lower than 12:00, the effect acts more like a limiter.
• Release allows you to set the amount of time after the input signal falls below the threshold before
the compressor "resets" and is ready to compress again. It's also called an "Attack" control in the
Boss CS-2 and Keeley Compressor.
• Level is the overall output volume of the effect.
• Treble controls the amount of treble attenuation immediately after the signal is compressed.
• Input is an internal trimmer that attenuates the signal going into the compressor, allowing you to
use it with high-output instruments such as keyboards or active pickups.
AURORA COMPRESSOR/SUSTAINER
11 Licensing
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