Helios / Pro Co RAT DIY PCB

Helios - Pro Co RAT Distortion Guitar Pedal PCB



Updated 6/2015 with minor adjustments to the knob positioning. See documentation for new drill template. Now with ENIG gold plating! Version 1 documentation can be downloaded here.

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Project overview

A classic 80’s distortion pedal, this one needs no introduction. My 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.