To all,

To add some more to the discussion, I would like to point out a couple of 
good on-line filter design tools.

FilterPro: An old DOS program that is very helpfull for low pass filter 
design. It is down-loadable from Burr-Brown at:  
www.burr-brown.com/applications/
Application Bulletin #34 gives the instructions as to how to use it (make 
plots and component selection etc).

FilterCAD: Available as a free CD from Analog Devices. CD also contains all 
of their Apllications bulletins, a very good resource in itself. Does plots 
etc, but a little light with help for the amateur hacker.

Hope these will be a help to someone.

Allan Coleman
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