aion Aurora Deluxe Manual - Page 6

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BUILD NOTES

Transistor substitutions

The original Compressor Plus uses MMBT6429 transistors, which do not have a current-production

through-hole equivalent. They are medium-gain low-noise transistors that are very close in specification

to the 2N5088 or BC549C.

The Aurora Deluxe PCB uses the USA E-B-C convention for Q1-Q5, so the 2N5088 will be a direct fit.

The BC549C or other European C-B-E convention transistors will need to be rotated 180 degrees from

the PCB silkscreen.

IC substitutions

The very first version of the Compressor Plus used

NE5532

for IC2 and IC3, the two dual op-amps.

They soon switched to RC4558P, which are still used in current models. The NE5532 has lower noise

and a better slew rate, but significantly higher current draw. The RC4558P is perfectly adequate for the

application and is recommended to use in this project, but you can use either type, or whatever else you

want such as a the TL072 or OPA2134.

The LM13700N was obsoleted recently in through-hole format, but is still readily available, including

from major distributors like Mouser. The

NE5517N

is a second-source substitute that will perform

identically, and is available from Aion FX.

AURORA DELUXE COMPRESSOR