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

[Oren Leavitt]

On 3/5/2014 9:58 AM, Jean-Pierre Desrochers wrote:
> I'm looking for schematics of a good 24db/oct HP-LP-BP-Notch VCF.
> All the filter modes outputs should be available simultaneously..
> The only filter I found that do such things is the following:
>
> http://www.analoguesystems.co.uk/modules/rs110.htm
>
> But no schematic available...
>
> Any suggestions welcomed.
> Thanks.
> JP
>

That design is most likely two tracking state variable filters connected 
in series for the 24db/oct response.
I believe there were some ideas for this in Electrontes.

- Oren