[sdiy] Possible 2164 12db/oct bandpass filter design.. corrected text in picture..

[Jean-Pierre Desrochers]

> You write that the CV ranges is 0 V ... 5 V, but I guess you mean -0.66 V
... + 3.3 V as this is the CV control range of the 2164.

You are right Mattias !

-----Message d'origine-----
De : navelludd at gmail.com [mailto:navelludd at gmail.com] De la part de Mattias
Rickardsson
Envoyé : 9 mars 2014 07:29
À : Jean-Pierre Desrochers
Cc : synthdiy diy
Objet : Re: [sdiy] Possible 2164 12db/oct bandpass filter design.. corrected
text in picture..

On 9 March 2014 01:55, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> There was an error in the text of the JPG.
> Corrected now.
>
> -----Message d'origine-----
>
> Here is a possible 2 x 2 poles, 12db/oct bandpass design made of one 2164.
>
> http://www.arcenson.com/public/2164_BP_filter.JPG
>
> Moving the 2 CV's opposite ways will 'open' the filter bandgap.
> Getting both CV's closer will 'close' the gap.
> Moving a common offset CV to both CV's will move the overall center 
> cutoff of the bandpass filter.
>
> I'll test it this weekend..

You write that the CV ranges is 0 V ... 5 V, but I guess you mean -0.66 V
... + 3.3 V as this is the CV control range of the 2164.

A slightly reduced range of 0 ... 3.3 V would also work fine with suitably
chosen capacitors, if this makes the overall design easier.

/mr