Schematic for a resonant low pass filter

[paolo]

Hi, I've been looking all over the web for the schematics or at least the basic principles and componentry behind a resonant low-pass filter.

I want to make a low-pass pedal of my own. And I'd like to design my own controls for it so, I need to understand what's going on in them filters. hahaha

cheers, louis

[cloudscapes]

there's a nice one halfway down this page
http://thesquarewaveparade.com/brdlayot.html

takes a bit of experementing, but the low part count make that bit doable with a bit of patience.

[frequencycentral]

At the risk of self promotion, why limit yourself to just lowpass?

http://www.diystompboxes.com/smfforum/index.php?topic=73021.0

[paolo]

Wow thanks cloudscapes, might take a little while to get a decent song, funny guy at the square wave parade.

Wow that's a nice build, frequencycentral, I'll probably give it a look when I'll be doing the envelope part mind you I really like the sound resonance gives, especially on bassy sounds. Going from a nice little grit to a more ringmod type of thing. I was also thinking on putting the envelope on the amount of resonance too.