Fairfield Circuitry Roger That

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"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, I would hide under the table when Roger came around. Later, when I first started in electronics, he gave me a bunch of parts, tools and bench equipment.

Controls interfere with demodulation accuracy resulting in familiar yet unexpected signal degradation and noise. Decoherence at its finest.

- 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: Preset range of the TUNE parameter:
* 1 normal
* 2 extended

- F: Apply voice filter ~(300Hz-3kHz) to wet signal:
* 0 filter off
* 1 filter on

- IN: 1/4" Instrument input
- OUT: 1/4" Output
- T: 1/8" CV input for TUNE
- 9V: 2.1mm 9VDC centre-negative tip, >30 mA

- The TUNE, SHIFT, DRIVE and RANGE controls are highly interactive.
- The higher the DRIVE, the more artifacts will be generated.
- TUNE is probably the widest, most non-linear, finest control ever included in our products. Micro adjustments here will drastically change the result of the demodulation.
- TUNE and SHIFT are mutually dependant, almost like they are the same control. By tweaking both, it almost seems like there is endless varieties of sounds.
- The RANGE switch shifts the whole palette of possibilities.
- Wet signal path is intentionally out of phase allowing for special interactivity between WET, DRY and FILTER.
- If the original signal is still present on the wet side, adding dry signal will cancel it out leaving only the distortion artifacts.
- If voice filter is activated in these same conditions, the result is a kind of mid-scoop instead of the usual bandpass.

- 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

- true bypass
- dimensions 4.7" x 3.8" x 1.9"
- input impedance 1MΩ
- output impedance 1kΩ
- power supply 9 9.6VDC
- current draw 30mA @ 9.6VDC