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

Tom Wiltshire tom at electricdruid.net
Wed Mar 5 19:21:22 CET 2014


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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