MFOS state variable filter Aleph style

isak

Hey Guys.

I found this scheme by mistake
http://www.aleph.co.jp/~takeda/radio/img/SEMClone-scheme.gif
Any one tried it?
Any one can tell if it will oscillate when reso pot is fully up like Ray original design?

Thank in advance,
Isak E.

isak · Posted: Wed May 02, 2012 4:17 pm Post subject:

Ok,

build it in stripboard, working great, sounds good.
my only problem is the reso, i dont think its up enough.
does any one can tell me please how can i rise the reso to be higher?
sound clip :
http://www.filedropper.com/demo_2
first LP then BP then HP

this is my layout if someone is interested, its working really good
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

if someone can help to rise the reso to osc i'll be grateful.

cheers,
Isak E.

Clack · Posted: Thu May 03, 2012 1:30 am Post subject:

experiment by adding clipping diodes in the res feedback path

look at this for inspiration

http://www.jhaible.de/tonline_stuff/hj_wasp.jpg

resonance is a bit hard to control on a SV filter as it varies with cutoff

isak · Posted: Thu May 03, 2012 2:03 am Post subject:

thank you for your reply.

did you mean something like that :
Posted Image, might have been reduced in size. Click Image to view fullscreen.