ARP 4023 VCF clone
The audio path is pure ARP, with one exception. Built stock from the schematic, the resonance would clip like a motherfucker above 3 o’clock, in a way which is neither musical or desirable. With a littel adaptation now resonance is usable and musical over the entire range. Uses an inverting buffer for the output for bringing the output up to modular level. A nice side effect of the inverting buffer is that if you mix the input signal with the filter output, and find the sweet spot, you can do highpass filtering too!
This is a complete kit EXCEPT OF the knob. Everyone has own preferences and that's why we didn't include it. You can get suitable knobs here. The components are packed, presorted and labelled according to the BOM where necessary, so you can start soldering immediately.
We carefully selected and assorted the parts of the Frequency Central kits ourselves and also put special emphasis on quality - audio grade electrolytics in the audio signal path, resistors form Yageo and Royalohm, Alpha pots, quality jacks, precision sockets and switches, etc.