Trustscore 4.6

Befaco BF-22 Sallen Key Filter (17HP)

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Key Features

  • MS-20 style Sallen-Key filter Eurorack module
  • Faithful recreation of an iconic low/high-pass filter
  • Delivers a more defined resonance
  • CV control for resonance and cutoff

Befaco BF-22 Sallen Key Filter (17HP) Overview

View this description in German

Inspired by the iconic Sallen-Key Filter. The Befaco BF-22 Sallen Key Filter bases its design on the classic Sallen-Key Filter, providing a faithful recreation with this MS-20 style module.



The Befaco BF-22 is a dual highpass/lowpass filter providing vintage-style filtering for your modular system. The original was known for its unique texture and tonality, providing a gritty and brash sound. The two-channel configuration can be used individually or connected within a series for adde flexibility.



With a more pronounced resonance, the Befaco takes the Sallen Key Filter to the next level. It also features a wide range of analog and CV connectivity for affecting external modules and audio sources.

Product Ref: 128180

Full Description

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Classic-Style Hi/Low-Pass Filter

The BF-22 bases its design on the iconic Sallen-Key filter. This special filter has been used in one of the most iconic synthesizers from music history. It was revered for its unique tonality and sonic characteristics, providing an aggressive, gritty yet rich sound.

Befaco have design the BF-22 as a faithful recreation of the classic filter. This dual high/low-pass filter can deliver everything from subtle grittiness to screeching in your face textures. It works by using the op-amp as a voltage-controlled voltage source amplifier. The two-pole Sallen-Key design delivers a unique tonality thanks to its specialised circuitry.

Resonance with Added Presence

In addition to the standard cutoff and resonance CV control, the BF-22 includes attenuverters. The resonance is more defined, providing added presence for modern-day applications. The ergonomic layout features sleek white knobs complete with vintage-style switches. The potentiometers are labelled with lines that correspond to the relevant connection.

Versatile CV Connectivity

With 10 patch points int total, the Sallen-Key filter can be used with a variety of audio sources. CV connections are included for the resonance and cutoff on both filters. Also included are dedicated inputs and outputs for both filters also.

The built-in Link switch allows you to connect a second unit to the output of the BF-22. This allows you to daisy-chain multiple units for added versatility. The CV control for the cutoff keeps tracking through three octaves for optimal precision. The sleek and stylish faceplate features an aluminium heat-treated front panel.

Features

  • Voltage-controlled low/high-pass filter Eurorack module
  • MS-20 style Sallen-Key filter
  • Delivers classic, iconic sound and tonality for various audio sources
  • Attenuverters included in addition to the standard CV control
  • More pronounced resonance for added grittiness and growl
  • CV control for the cutoff tracks through three octaves
  • Link switch connect the input of the second unit into the output of the first
  • Aluminium, heat-treated front panel
  • Ideal for sound design applications

Specifications

  • Current Consumption: +12V: 40mA, -12V: 35mA
  • Module Width: 17HP
  • Module Depth: 47mm

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