State Variable VCF 12dB/Octave With VC Resonance (Rev 001)
(Works from +/-9V to +/-15V)

Article by Ray Wilson
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State Variable VCF 12dB/Octave
With VC Resonance PC Board (4.0" x 3.2") (Rev 001)
Click for larger view (100K jpg)    Click for larger view (100K jpg)

State Variable VCF 12dB/Octave With VC Resonance (Rev 001)
PCB Parts Layout (Parts Side Shown) PDF

State Variable VCF 12dB/Octave With VC Resonance PCB Bottom Copper (Parts Side Shown)

State Variable VCF 12dB/Octave With VC Resonance PCB Top Copper(Parts Side Shown)

State Variable VCF 12dB/Octave With VC Resonance PCB Top Silk Screen

State Variable VCF 12dB/Octave With VC Resonance PCB Populated

If you noticed I didn't have any 180K or 300K resistors so I had to use 150K+30K for one and 270K+30K for the other.