Fairfield Circuitry Long Life Parametric EQ

A state-variable filter with wide range and application. Versatile. Combining tilt and notch/boost equalization around a 2nd-order (-12dB/octave) state-variable core.


Very much a one-band parametric equalizer with gritty extras:



  • Shelving filter, from low-pass to high-pass

  • CV inputs for resonance (Q) and frequency (F)

  • V/octave scaling synthesizer interface

  • Fully variable Q goes well into tasty sweet self-oscillations

  • Soft clip zener zesty mordant

  • Expression pedal input controls center frequency