Pure VCF

Pure VCF


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The GMSN! Pure VCF is used to filter two incoming audio signals.

This can be done manually using the cutoff knob or automatically using control voltages.

There is also a feedback knob controlling the resonance. This causes an amplification of the signal at the cutoff frequency, giving the classic squelchy acid sounds.

The feedback can also make the filter self oscillate providing a very clean sine wave output, with temperature compensation. This sine wave can be calibrated to 1 volt per octave.

Open Source Documentation
Eagle Schematic: Pure-VCF.sch
Eagle PCB: Pure-VCF.brd
Eagle Panel: Pure-VCF-PCB-Panel.brd
Cadlab.io Schematic: Pure-VCF.sch
Cadlab.io PCB: Pure-VCF.brd
Bill of Materials: Pure-VCF.csv
Further build documentation and guidance is provided to GMSN! Supporters via the forum. Please buy direct from GMSN! to create a forum account.

Additional information






13mA -12V, 16mA +12V