Akashic Guitar effects PCB lookup
PREGAINTHRESHOLDVOLUME

125B · 3 knobs

Aion FX

GaleBooster / Limiter

Based on the SoloDallas SVDS

Category
Boost· Booster, Optical Limiter
Controls
Pregain · Threshold · Volume
Difficulty
Easy
Price
$12.50in stock

From the vendor

A pedal adaptation of the Schaffer-Vega Diversity System (SVDS), the first widely-used wireless system for guitar, famously used by AC/DC, Van Halen, Kiss, and Pink Floyd.

The Gale Booster / Limiter is a pedal adaptation of the Schaffer-Vega Diversity System, and more directly based on the SoloDallas Storm (version 2, 2019, traced by Aion FX). The SVDS was designed by Ken Schaffer and released in 1976 by the Vega Corporation. It was the first wireless system that was reliable enough to be used by major touring acts.

While it was used by several famous guitarists including Ace Frehley, David Gilmour and Eddie Van Halen, it’s Angus Young of AC/DC whose tone was most impacted by it. He found that when he was in the studio, he couldn’t get quite the same tone as he got on stage, so he ended up running his guitar through the wireless unit even when recording.

Because of this, the SVDS joins the ranks of the SDD-3000 and Echoplex EP-3 as an effect unit whose coloration was desirable even when the main part of the effect wasn’t used. In the pedal adaptation, the actual wireless portions of the SVDS have been removed, leaving only the pregain, limiter, and output amplifier, which form the core analog signal path of the original unit.

The Gale is a direct adaptation of the Storm with no changes except for some added power filtering.

Disclaimer: Aion FX is in no way affiliated with SoloDallas. Any trademarks are property of their owners and used only for comparative purposes. SoloDallas makes a wide range of incredibly high-quality products. If you like what they do, support them!

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 53 rows

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RefValueNormalizedTypeNotes
Resistors 17
R12k2kMetal film resistor, 1/4W
R21M1MMetal film resistor, 1/4W
R32k2kMetal film resistor, 1/4W
R415k15kMetal film resistor, 1/4W
R51k1kMetal film resistor, 1/4W
R610k10kMetal film resistor, 1/4W
R710k10kMetal film resistor, 1/4W
R82k2kMetal film resistor, 1/4W
R98k28.2kMetal film resistor, 1/4W
R102k2kMetal film resistor, 1/4W
R1110R10Metal film resistor, 1/4W
R1210R10Metal film resistor, 1/4W
R1310k10kMetal film resistor, 1/4W
R1410k10kMetal film resistor, 1/4W
R1510R10Metal film resistor, 1/4W
R1610R10Metal film resistor, 1/4W
LEDR4k74.7kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 16
C21uF1uFilm capacitor, 7.2 x 3.5mm
C310uF10uElectrolytic capacitor, 5mm
C4120pF120pMLCC capacitor, NP0/C0GMeasured value 130pF in original.
C61uF1uFilm capacitor, 7.2 x 3.5mm
C71n1nFilm capacitor, 7.2 x 2.5mm
C8100n100nFilm capacitor, 7.2 x 2.5mm
C910uF10uElectrolytic capacitor, 5mm
C10100n100nFilm capacitor, 7.2 x 2.5mm
C1110uF10uElectrolytic capacitor, 5mm
C12100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C13100n100nMLCC capacitor, X7RPower supply filter capacitor.
C1410uF10uElectrolytic capacitor, 5mm
C15100n100nMLCC capacitor, X7R
C1610uF10uElectrolytic capacitor, 5mm
C17100n100nMLCC capacitor, X7R
C18100n100nMLCC capacitor, X7R
Diodes 5
D11N58171N5817Schottky diode, DO-41
D2BAT42BAT42Schottky diode, DO-35
D3BAT42BAT42Schottky diode, DO-35
D4BAT42BAT42Schottky diode, DO-35
D5BAT42BAT42Schottky diode, DO-35
ICs 2
IC1RC4558PRC4558POperational amplifier, DIP8
IC2LM386N-1LM386N-1Audio amplifier, DIP8
Opto 1
VACTNSL-32NSL-32Vactrol/opto-isolator, NSL-32
Potentiometers 3
PRE.100kBB100k16mm right-angle PCB mount pot
THR.100kAA100k16mm right-angle PCB mount pot
VOL.1kBB1k16mm right-angle PCB mount pot
Switches 1
FSW3PDT3PDTStomp switch, 3PDT
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 5
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IC2-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountMouser 163-4302-E or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.