[sdiy] Looking for 2164 12db/oct slopes bandpass filter design.. more detailed..

[Roman Sowa]

why not take a look at "the classics", now almost 14-years old design, 
which among other things, does exactly that - chains 2 state variable 
2-pole filters, one HP, one LP, with control for the gap size.

http://sowa.synth.net/modular/vcf.html

just replace 2164 cell with other OTA in the feedback path so to need 
only one 2164 for both filters.

Roman

W dniu 2014-03-08 17:46, Jean-Pierre Desrochers pisze:
> In fact I should have been clearer on my needs..
> I'm looking for a 2164 based  bandpass filter design
> Built with one separate 2 poles lowpass (12db/oct) (2164 section #1+2)
> In series with one separate 2 poles highpass (12db/oct) (2164 section #3+4).
> These 2 blocks in series  make it possible to feed 2 separate & different
> cutoff CV's
> Thus having the possibility to open or close a 'gap' between the cutoffs
> Creating a variable bandwidth for the overall bandpass filter CV controlled.
> That's why I cannot use a 'derivated' bandpass from a lowpass design
> using pole mixing because the cuttof freq would be the same
> All around the 2164 blocks..
> I'm only looking for schematics of:
> -2 poles 2164 based lowpass filter (12db/oct slope)
> -2 poles 2164 based highpass filter (12db/oct slope)
>
> Your ideas are welcomed.
> J-Pierre
>
>
> -----Message d'origine-----
> De : synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] De la part de Jean-Pierre
> Desrochers
> Envoyé : 7 mars 2014 11:34
> À : synth-diy at dropmix.xs4all.nl
> Objet : [sdiy] Looking for 2164 12db/oct bandpass filter design..
>
> Looking for 2164 based 12db/oct bandpass filter design..
>
> Any web link ?
>
> Thanks
> JP
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