BBX291 VCF

Buchla 291-style vari-bandwidth filter

Nonlinearcircuits · 10 HP · 3U

Panel · 50.8 × 128.5 mm

Description

After the Buchla 291 vari-bandwidth bandpass filter, with LDRs in a black box instead of vactrols and simpler CV circuits for a better range; it adds a Q knob and HP and LP outputs. A sine or triangle at FM gives trickling sounds. The BW CV and FREQ CV knobs are attenuverters, 0 at their centre (not marked on the panel). Two LEDs shine through bare windows in the panel.

Key features

  • IN, FM, BW CV and FREQ CV in; HI, BP, BP (inverted) and LP out
  • IN, BW, BW CV, FM, FREQ, FREQ CV and Q knobs
  • Two square windows lit by LEDs (drawn unlit)
  • 10 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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