This is a bare PCB for Old Crow's CS-80 SVF filter board for the Shruthi monosynth, originally designed by Mutable Instruments, and later open-sourced.

A fully through-hole design makes this an easy assembly for all levels of DIY experience.

Features:

• recreation of the Yamaha CS-80 filter using dual V2164 VCA chips (popular clone of the classic SSM2164 chip)

• differs from the Shruthi Dual SVF filterboard by limiting the resonant feedback and summing into the high-pass nodes to emulate the CS-80 phase-shift characteristics

Sound demonstration available here.

NOTE: If you already have a Shruthi Dual SVF filterboard and have socketed the chips, they could be transplanted for use in this board.