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

[Jim Patchell]

There is an article in Electronotes that tells you how to do this.  
Which issue....can't remember.

<shrug>

-Jim

On 3/5/2014 10:40 AM, blacet at blacet.com wrote:
> 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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