[sdiy] How do i make a simple filter resonant ?

[Michael Buchstaller]

Hello friends,

for my modular, i have done several filters. Moog, ARP, and
other filter clones.

Now, i wanted to do some experiments on my own. Simple RC filters
seem to work, and an OTA filter straight from the National App notes
works, too.
But i want these filters to have resonance so they do not sound that dull.
What shall i do ? Somewhere i have read to feed back some part of the
output to the input, but this did not work for me.
Could some of you experts point me in the right diection, perhaps a
"resonant filter tutorial" somewhere ?


-Michael Buchstaller