FM OP

Through-zero FM operator on the SSI2130

Nonlinearcircuits · 4 HP · 3U

Panel · 20.3 × 128.5 mm

Description

A through-zero VCO on the SSI2130, built as an FM operator after John Chowning: oscillator and VCA in one, the envelope patched in; two or more are needed, with the NLC Valmorification and 4HP Mix as companions. CV, FM, phase modulation and hard sync; a sine output that still gives very complex waveforms. With nothing in FM a 2.5 V offset reaches it through the jack's switch; with nothing in VCA the VCA is open.

Key features

  • CV, SYNC, FM, PM and VCA in; OUT (sine)
  • FREQ, FINE, CV and FM knobs
  • 4 HP; Nonlinearcircuits publishes no current draw, depth or assembled price (it sells the DIY PCB and panel), and ModularGrid lists none

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