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

[harrybissell]

Hi Paul...

The MS-20 has a quad pot, but it actually is used to set time constants in both
the
input filter and the output filter at the same time... its not used as a 4-pole
LPF

(otoh I forget if it is divided 2 x 2 or 1 x 3... have to check the schematic
again)

H^) harry

Paul Perry wrote:

> At 05:47 PM 10/11/03 -0500, you wrote:
> >two filter sections.....in the case of a SVF that would mean quad FREQ
> >pots, which is not feasible for me.
>
> FWIW, the MS20 pitch to voltage section has a quad frequency pot for the
> low pass filter at its input.
> The beauty of PWM switched resistor filters, is that you can have as many
> "pots" ganged as you want ;D
> But an OTA based filter allow as many "variable resistors" as you want too.
> paul perry melb aust