Path Filter

N-path filter, between filter, phaser and shift register

Nonlinearcircuits · 8 HP · 3U

Panel · 40.6 × 128.5 mm

Description

Between a filter, a phaser and a crude BBD shift register, after Elektor's 1975 article on path-filter phasing and Siliconix's 1976 chapter on N-path filters: sixteen capacitor and switch stages, buffered, run by a clock, usually a high-frequency one, best modulated. The clock divided by 4, 8 and 16 comes out on the panel, /16 feeding IN 1's switch. Q RANGE, Q and Q CV drive a vactrol; IN 2's switch and an attenuverter give feedback.

Key features

  • CLOCK, IN 1, IN 2 / F/BACK and Q CV in; /4, /8, /16 and OUT
  • IN2/FB, Q, Q RANGE and Q CV knobs
  • 8 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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