Fairfield Circuitry Roger That FM Modulator/Demodulator RF Distortion Pedal

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Fairfield Circuitry Roger That FM Modulator/Demodulator RF Distortion Pedal

"What we have here is a failure to communicate"

Inspired by Roger Grant's idea to mimic loss of fm radio signal through the use of a simplified fm modulator/demodulator scheme. As a young child, Fairfield would hide under the table when Roger came around. Later, when Fairfield first started in electronics, Roger gave Fairfield a bunch of parts, tools and bench equipment. Controls interfere with demodulation accuracy resulting in familiar yet unexpected signal degradation and noise.

While it is true that RF is especially effective at professional noise making, it remains relatively safe for amateur producers.


• TUNE Like turning the dial on your receiver, the TUNE parameter sweeps through a wide variety of sounds. From subtle artifacts, to extreme textures, noise and distortion. Summmed with CV at T input.
• SHIFT Shifts the accuracy of tracking the incoming modulated signal. Sometimes acts as a filter. Highly dependent on TUNE.
• DRIVE Controls the input level, from clean to dirty. Pushing the DRIVE control generates extreme non-linearities from the modulator/demodulator circuit. Affects both the wet and dry signals.
• WET Amount of wet signal at the output.
• DRY Amount of dry signal at the output.

R Mini Switch - Preset range of the TUNE parameter:

• 1 - normal
• 2 - extended

F Mini Switch - Apply voice filter ~(300Hz-3kHz) to wet signal:

• 0 - filter off
• 1 - filter on


• JFET pre-amp
• CV on TUNE
• RFI/EMI approximator
• FM/AM radio quality reducer
• volatile and unpredictable distortion
• noise, pop, crackle and squeal generator
• impress your friends
• Decoherence at its finest.
• true bypass
• dimensions 4.7" x 3.8" x 1.9"
• input impedance 1M ohm
• output impedance 1k ohm
• power supply 9 - 9.6VDC
• current draw 30mA at 9.6VDC