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Befaco ‘BF-22 Dual Sallen VCF’– Full DIY Kit

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PLEASE NOTE, THE DIY VERSION OF THIS FILTER COMES WITH A BLACK PANEL ONLY

This is a dual Hi/Low pass filter. Inspired by the famous sallen key filter from original Korg MS-20. All SMD parts are pre-soldered to the PCB, no SMD soldering is required!

It has attenuverters (inverter-attenuator) as an addition to the normal CV control in Cut-Off and CV control for the resonance with a little more presence of the resonance than the original. The normal CV control for Cut-Off keeps tracking trough 3 octaves.

The ‘Link’ switch connects the input of the second into the output of the first to have it in series

Specs:

  • Eurorack Compatible
  • Can be powered with +/-12V or +/-15V without changes.
  • Current needs: +12V: 40mA -12V: 35mA
  • Banana or minijack connectors available
  • Selectable HP/LP mode 6/12 dB
  • Cutoff and resonance CV controlled.
  • 17 HP / 47 mm depth

DISCLAIMER: This filter brings to your modular system the character and characteristics of early MS-20 sound: Kick-ass-rocking-dirty screams!. It inherited not only it’s amazing sound, also MS-20 noise floor. If noise floor is an issue for you, this might not be your filter.

Asembly manual

Schematics PDF | CAD/CAM files


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