sallen key theory...check this out...

[swt]

i was looking for some theory and found some really usefull pages. enjoy!

http://mysite.wanadoo-members.co.uk/tstinchcombe/synth/MS20_study.pdf

http://focus.ti.com/lit/an/sloa024b/sloa024b.pdf

http://www.circuitsage.com/filter/sallenkey.pdf

it seems that it can be done really simple, and sounds great. Tim Escobedo is the guy, man. his filters are simple and taken from this stuff. Hope to see more of his stuff in the near future.

[Rick Hardslab]

http://mysite.wanadoo-members.co.uk/tstinchcombe/synth/MS20_study.pdf

The first one was my favorite.

[Tim Escobedo]

Wow. Fantastic stuff. I should learn how to do these things right.

[Kornell]

Thanks!

[Ry]

Thanks for sharing!  Those are some great links.

[Zero the hero]

Thanks! 

[swt]

Hey Tim!! Nice you got here!. I have a question...in your 9volt sallen you use a 220l feedbacl resistor, and if you take a look at those ibanez pedals, they use a 20k resistor. Could it be that there's too much gain so that's where the distortion is coming as you mention int he snippets?. Why did you chose that?. I realle need a 9 volts sallen ms20 type of filter, and might experiment a little with your design. Thanks for an amazing work!!

[Arno van der Heijden]

Wow! Thanks!!