This is a schematic of a parametric EQ.
I would like to us it as a bandpass filter (wah)
The filtering section is basically a Craig Anderton super tone control wah.
(http://img201.imageshack.us/img201/7786/andertonsupertonecontrozr1.gif)
Would I need to modify this circuit? Could I remove the mid control (green box) because I'll use the dual pot to sweep through the mids. And how would I wire this up?
(http://i236.photobucket.com/albums/ff26/sauerkret/Untitled-2.jpg)
Kind regards, Eric
Bump
The mid control seems to be the boost/cut control. But you can keep just the bandpass filter made by the three AOPs and sending your input signal into the first. The dunlop Q zone ( is made in the same way) . Look at its schematic , that's very close.
You could make the mid pot a trimmer.
another thing that i am curiouse about is why there is a Dual potentiometer instead of a regular single pot.
is this crucial to the filtering? and why would that be so?
thanks, Eric.
Anderton addresses the idea of turning the Super Tone Control into a Wah pedal in his book. If you don't own the book already, it might be worth picking up. In any event you need to find a treadle that will accommodate a dual ganged potentiometer.
Quote from: Sauerkret on November 13, 2009, 04:11:00 AM
another thing that i am curiouse about is why there is a Dual potentiometer instead of a regular single pot.
is this crucial to the filtering? and why would that be so?
thanks, Eric.
State Variable Filter*: no need for dual pot - you can use dual-vactrol or 2 OTAs, too...
(or 2 PWM-ed CMOS switches, see "MXR")
*search...
Thanks for the specific works that I didn't know.
with that word google gave me a lot of things ;D
Quote from: fuzzo on November 13, 2009, 07:05:24 PM
Thanks for the specific works that I didn't know.
with that word google gave me a lot of things ;D
Yep: the most interesting thing in the first schemo of the >1.5 million google-returns is: Rf1=Rf2 ... :icon_wink: