Let's Go Shopping

1973 Voltage Controlled Filter

Let's Go Shopping



This is a licensed adaptation of the original Serge VCF

The CGS577 is a 2-pole state-variable filter with 12dB/octave slopes on the [LOWPASS] and [HIGHPASS] outputs and a 6dB/octave slope on the [BANDPASS] output. The CGS577 does not self oscillate.

By turning up the [Q] resonance control, the filter can used as a percussion sound generator - xylophone, wood block, drum, bell, gong, vibraphone.

It does not have a 1V/Octave input but does have a scalable [VC F] input, so can be adjusted to track to play tunes, etc.

NB: This new revision does not include any unassigned buffers or LED driver.


PCB Dimensions: 2" x 6" with 3.2mm fixing points 0.15" from the edges
Power Consumption: +12V @ -12V @

Original article, art & design copyright by Ken Stone

Email:  elby-designs@bigpond.com
© Copyright 2000. All rights reserved.     Revised: July 30, 2020