Weird VCF idea! (SC-filter!)

[Tony Allgood]

I've thought about switched cap. filters as well. In fact, I had
originally thought about it for my Walsh generator. But remember you do
have to follow most of them with a filter to take away the clock from
the output. Since you would be having a variable clock frequency for
swept filtering, wouldn't you have to have a swept LPF to remove the
clock. Doesn't that defeat the purpose. Or am I talking crap, its been
a long week!!

Tony Allgood.

Penrith, Cumbria, UK     

e-mail: oakley at enterprise.net

'I may live in the middle of nowhere, but the views are nice'

----------
> From: Erik Schuijers <eriks at stack.nl>
> To: synth-diy at horus.sara.nl
> Subject: Weird VCF idea! (SC-filter!)
> Date: 05 September 1997 10:01 AM
> 
> Hi all,
> 
> I have another weird idea for making a VCF. It's by using the
MF-series
> SC-filters by National Semiconductor. It works really easy. Has
anyone else
> ever thought about it?
> 
> The only backdraw is that the cutoff frequency should be controlled
by a
> VCO. In order to keep voltage controlability.
> 
> For those who are interested: check out national's homepage and
search for
> the switched capacitor filters!
> 
> Erik