The Synthacon VCF was designed by Ken Stone. Schematics, PCBs etc can be found at his site.

This filter is really, really good. I haven't had a lot of chances to play with analog synthesizers since they've allways been to expensive for me, hence building my own. But! The synthacon VCF sounds fatter then anything i can recall, this is a definite must-have.

The synthacon is cheap to build and not too complex, i've done several breadboard attempts which have all succeeded.

For the ARS2 it was convenient to have a LP, BP, HP switch. The following is a small add-on i did for the synthacon to allow for this with a SP3T with NC in the middle:

A breadboard layout for the Synthacon VCF can be downloaded below, both in .gif format and PCB Express .pcb format. Please direct any questions regarding this and not to Ken Stone.

>>Synthacon VCF BB-layout (GIF format)
>>Synthacon VCF BB-layout (PCB format)