Available as an assembled Module and as a DIY project.
This Module is currently available.
CMOS Filter
The CGS749 is based on the popular CMOS based Wasp VCF.
In addition it also features adjustable post-filter distortion.
http://www.elby-designs.com/contents/en-us/p989_CGS749_-_CMOS_Filter.html
2 Users are observing this
These merchants probably sell this module. Huh?