Rhythm & Detonation

ren raT

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The 4 Horsemen of the Apocolypse, Rat.

This is a 4 knob rat featuring Albrecht Dürer's artwork from his woodcuts of the book of Revelation. The artwork is a cropped portion of The 4 Horsemen of the Apocalypse.

The circuit is a 4 knob rat distortion made with the LM308N opamp and 2x 1n914 clipping diodes. The 4th knob on a 4 knob rat replaces the 47 ohm resistor with a 500 ohm pot so you can adjust this part of the circuit. Fully counter-clockwise the rat gets very trebly and squeaky with huge upper harmonics and a propensity to feedback. Turned up about a quarter turn it is in the sweet spot of a stock rat, but as you turn it further clockwise the bass tightens up and gets less fizzed out and more punchy.

The pedal is housed in a horizontal hammond 1590BB enclosure is painted in Almond colored enamel. The knobs are black davies 1510 with a water clear red led.


Moby Dick

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Shibbz Rat


circles become ghosts

rainbow gif

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Deathmask Distortion

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Slow Loris

This pedal is the ultimate version of the Rat. The Rat is one of the most famous distortion pedals of all-time, and to me it captures the classic sounds of the '80s and '90s post-punk- and grunge eras.

The controls are pretty much the same as the Rat, but my pedal has a 3-way clipping switch: The left position provides asymmetrical silicon clipping provided by three 1n914 diodes; the middle position has no clipping; and the right position is symmetrical, with two red LEDs.

The silicon clipping has a softer, warmer clip; the red LEDs have a more hard-rock clipping; and, interestingly, the no-clipping option still provides distortion. This is because the LM308 op-amp is being taxed to the extremes and still clips the signal some, thereby providing distortion, although it's really open distortion with lots of clarity.

The PCBs for this project are available from madbean as the Slow Loris PCB.

I painted the pedal using Testor's one-coat lacquer in fiery orange. I used Lazertran laser decal stock, and I clear coated it using Minwax Polyacrylic high-gloss lacquer.

The knobs are Davie's 1510 black knobs, and I used a water clear yellow LED.