[sdiy] Design for a very strong filter?

[Tom Wiltshire]

On 7 Jun 2008, at 03:14, BRUCE DUNCAN wrote:

> Switch cap filters are great but you will have trouble finding 8  
> order versions.
> Most have been obsoleted. The National ones at least.

Perhaps National have stopped making so many, but Maxim still have  
quite a few listed.

	http://para.maxim-ic.com/en/search.mvp?fam=filt&273=Switched% 
20Cap&tree=filters

You can get Butterworth, Bessel or Elliptic filters, you can run them  
on +/-5V and they are available in a 8 pin DIP.

Tom