Akashic Guitar effects circuit lookup
FILTERDISTORTIONSWEEPVOLUME

1590B · 4 knobs

Aion FX

Helios (Legacy)

Based on the ProCo RAT· 41 other boards clone it

Category
Distortion
Controls
Filter · Distortion · Sweep · Volume
Difficulty
Easy
Price
see vendor
Buy the PCB at Aion FX Build document Build Documentation (v1) pdf

From the vendor

A distortion pedal with a very distinctive and tight mid-to-high-gain character that made it a staple in the rigs of 1980s hard rock bands.

A classic 80’s distortion pedal, this one needs no introduction. This version can be built with either 3 or 4 knobs (adding the well-known “Sweep” mod), with the Filter knob having two possible orientations to keep things symmetrical.

It also incorporates a switch for the clipping diodes. One side is stock while the other side allows a number of possible modifications, including a “softness” trimmer (clipping threshold control) and plenty of room to stack diodes or use LEDs.

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 35 rows

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RefValueNormalizedTypeNotes
Resistors 11
R11M1M
R21k1k
R347R47
R4560R560
R51k1k
R61k51.5k
R71M1M
R810k10k
R947R47
R10100k100k
R11100k100k
Capacitors 13
C122n22n
C21n1n
C330pF30p
C4100pF100p
C52u22.2u
C64u74.7u
C74u74.7u
C83n33.3n
C922n22n
C101uF1u
C11100uF100u
C12100n100n
C1347uF47u
Diodes 3
D11N9141N914
D21N9141N914
D51N40021N4002
Transistors 1
Q12N54572N5457
ICs 1
IC1LM308NLM308N
Potentiometers 4
FILTER100KAA100kPotentiometer
DISTORTION100KAA100kPotentiometer
SWEEP1KBB1kPotentiometer
VOLUME100KAA100kPotentiometer
Switches 1
SW1SPDTSPDT
LEDs 1
LED1intoINTO

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