Befaco – BF-22 DIY Kit

165,00 Incl. 19% VAT

BF-22 is a dual Hi/Low pass filter inspired by the famous sallen key filter from MS-20 early version.

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SKU: 2112345678923 Category: Tag:


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.


User Manual

Assembly Manual

Schematics PDF

CAD/CAM files



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.