Befaco BF-22 Sallen Key Filter full diy kit


A full kit to build a dual Hi/Low pass filter. Inspired by the famous sallen key filter from the original Korg MS-20.

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SKU: befaco-bf-22-sallen-key-filter-full-diy-kit Category: Tags: , , ,


Befaco BF-22 Sallen Key Filter

The BF-22 VCF is a dual Hi/Low-pass filter inspired by the Sallen-Key filter from the early MS-20.

The module features attenuverters (inverter-attenuators) as an addition to the normal CV control for Cut-off and Resonance, and offers a little more presence in the Resonance than the original. The CV control for Cut-off keeps tracking through 3 octaves.

The ‘Link’ switch connects the input of the second unit into the output of the first.


  • 17 HP / 47 mm depth (inc power connector)
  • current needs: +12V: 40mA, -12V: 35mA

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.

All SMD parts are pre-soldered to the PCB, no SMD soldering is required!

Download user manual here and assembly instructions for latest version here.

Additional information

Weight 0.24 kg


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