Aion Electronics GALE Manuale - Pagina 5

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BUILD NOTES

Wiring note

In order to maintain good grounding practices, the LM386 output stage has been given its own ground

instead of sharing a ground plane with the input stage and limiter circuit. Because of this, there is

another ground wire that needs to be connected on the right side, adjacent to the "Out" wire.

The wiring diagram shows this added wire, but since it's otherwise identical to most other Aion projects,

it could easily be overlooked.

Omitted parts

The SoloDallas Storm has two capacitors on the PCB that are populated, but linked by jumpers on

the bottom side so that they are disconnected unless the jumpers are in place. This is a common

manufacturing trick in SMT assembly that lets them decide on the fly whether to use either of the

capacitors, even on a per-unit basis.

The first is a 120pF capacitor on the input, which is commonly used to tame radio frequencies, and is

marked "input RF filter" on the PCB.

The second is a 10uF capacitor in parallel with the vactrol LED which helps control the attack time,

marked "isolator threshold" on the PCB. This capacitor is very commonly used in similar optical

compressor/limiter circuits.

In the Gale project, the jumpers have been omitted, so you can just decide whether to include the

capacitors or leave them off. On the unit that was traced, both jumpers were unpopulated, so both

capacitors were disconnected.

Vactrol selection

The original Storm unit uses an NSL-32 vactrol. A VTL5C3 was found to work just as well, so there are

probably a few different types you can use here if you don't have access to the NSL-32.

GALE BOOSTER / LIMITER