[sdiy] SVF: 2-pole to 4-pole ?

[mark s]

ah right, i'd forgotten. how do you recommend getting good logarithmic 
control ?
mark

At 09:07 PM 11/10/2003 -0500, you wrote:

>In a message dated 11/10/03 2:53:43 PM, djarum11 at mindspring.com writes:
>
><< two filter sections.....in the case of a SVF that would mean quad FREQ
>pots, which is not feasible for me. what is this Laplace method you mention?
>
>mark >>
>
>Hello Mark,
>
>You won't need quad pots if it's a voltage controlled filter - just a single
>pot will do.  That pot would be just a simple voltage divider pot whose
>voltage output would be sent to all four of the gain cells at the same 
>time (maybe
>through some buffers and trimmers, depending on design factors of the gain
>cells).  If you're building a non-voltage-controlled filter, then yes, 
>you'd need
>a separate frequency pot for each filter stage.
>
>Sorry, I can't answer the Laplace question.  Too mathy for me.
>
>Michael Bacich