looking for Filter circuit

[Gabriel]

I'm lookikng forward to build a Filter: lowpass, hipass, bandpass (no auto-wha). It will be used to shape noisy fuzzes.

Please, if anyone know a design, please, let me know.

Thanks in advance

Gabriel.

[R.G.]

Google "Anderton Super Tone Control"

[a soBer Newt]

Google "Anderton Super Tone Control"

If you want you could buy a pcb from me.

Here is the thread about it. http://www.diystompboxes.com/smfforum/index.php?topic=96510.msg861224#msg861224

[waltk]

If you want to break new ground on this, you could try a UAF42 chip. It's a BB "Universal Active Filter".  It has 4 opamps; 3 for the filter(s), and 1 spare - all on one chip.  I was going to try making an autowah with one, but didn't get around to it.

[amptramp]

You appear to be looking for a state variable filter as described here:

http://www.daycounter.com/Filters/StateVariableFilters/State-Variable-Filter-Design-Equations.phtml

This gives simultaneous lowpass, bandpass and highpass outputs with independent control of frequency and Q.  You can ignore the derivations and skip to the simple equations at the end of the page.

[Gabriel]

Thanks, i will try it.