Rhythm & Detonation
14Feb/110

DH-TG

This is a Gristleizer pedal I built for Dwid Hellion. The Gristelizer is a circuit designed way back in the 70's by Roy Gwinn and made famous by the Avant-Garde group Throbbing Gristle. In it's most basic essence it is a tremolo pedal at heart, but it has some very unique controls that make it a great sound destroyer. The RATE control has an extreme range from ridiculously slow to super fast, so fast that it will self oscillate and create its own notes that interact with the input source. The depth control goes from a mild chop to hard clipped choppy stutter. The BIAS knob is an interesting control that you can adjust to starve the bias and create interesting noise with. The level control sets the overall output of the effect. The VCA/VCF switch selects between the two modes; VCA mode is a Voltage Controlled amplifier behaves like a normal tremolo controlling the level of the output signal with the oscillator, VCF mode is a Voltage Controlled Filter where the Cutoff Frequency is controlled by the Oscillator. This behaves like an automatic Wah.

The middle selector chooses the wave shape form between Ramp Up, Ramp Down, Triangle, or Pulse waves.

The PCB's for this project can be purchased over at musicpcb.com. They did a great job modernizing the circuit for easier to find parts used an onboard charge pump to allow you to power the effect with a standard 9v dc adapter that most guitar pedals use. They also added an LED which flashes along with the rate of the oscillator.

This effect is housed in a Hammond 1590DD enclosure that was painted in Testor's One Coat Lacquer Diamond Dust. The artwork was supplied by Dwid and applied as a waterslide transfer clearcoated with Minwax Polyacrylic. The knobs are Black Davies 1510, and the leds are water clear white.

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