Befaco BF-22 Dual Sallen-Key VCF Partial Kit

Befaco BF-22 Dual Sallen-Key VCF Partial Kit

Build a characterful dual analog filter with this partial DIY kit. The completed BF-22 features two independent Sallen-Key filter sections inspired by the aggressive sound of the early MS-20 filter circuit, making it suitable for smooth tonal shaping, resonant sweeps, distortion, and self-oscillating effects.

Each section can operate as a high-pass or low-pass filter and provides dedicated cutoff and resonance controls. CV attenuverters offer positive or inverted modulation over cutoff and resonance, while the Link switch routes the first filter into the second for serial processing and more complex filter responses.

Additional components are required to complete the module.

• Partial DIY kit for the BF-22 Eurorack module
• Dual Sallen-Key analog filter
• Inspired by early MS-20 filter circuits
• Selectable high-pass and low-pass operation
• Independent cutoff and resonance controls
• CV control over cutoff and resonance
• CV attenuverters for positive or inverted modulation
• Cutoff tracking across approximately three octaves
• Link switch for serial dual-filter processing
• Capable of highly resonant and aggressive filtering
• Additional components required
• Not a complete DIY kit

• BF-22 PCB set
• BF-22 aluminum front panel
• Additional project-specific kit parts