Hello List,
I developed VCF cores using SSM2164 and put schematics on my blog
(Schematics with comments in Japanese).
All pass filter:
http://houshu.at.webry.info/200602/article_2.html
Low pass filter:
http://houshu.at.webry.info/200602/article_3.html
I hope some of you like it.
Sam HOSHUYAMA
Saitama, JAPAN