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

blacet at blacet.com blacet at blacet.com
Wed Mar 5 19:40:50 CET 2014


As far as I know, the state variable filter design is the only one that
has simultaneous outputs as you require. This is a 12dB design with two
stages, although with enough feedback/Q, the apparent slope is much
greater.


>
> On 5 Mar 2014, at 17:13, Neil Johnson <neil.johnson71 at gmail.com> wrote:
>
>> 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 Oberheim matrix 12/Expander multimode VCF might give you some clues.
>
> That was my first thought, but the Xpander pole-mixing design doesn't do
> 4-pole HP. It'll do 3-pole HP, but only by switching the first stage out.
>
> T.
>
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