[sdiy] Good 24db/oct HP-LP-BP-Notch filter Schematics ??

[rburnett at richieburnett.co.uk]

> In summary then, the RS110 is either:
> 
> 1) A 4-pole SVF design
> 
> 2) A 4-pole LPF with pole-mixing providing simultaneous outputs
> 
> Thanks,
> Tom


More likely option 2 if the product has a single global feedback path in 
which you can insert an external processor.  The 4-pole SVF is a 
"leapfrog" arrangement with multiple feedback paths if I remember 
correctly.

-Richie,