design tool

[Robin]

Check out this interactive design tool at National Semiconductor's site:
http://cache.national.com/appinfo/webench/scripts/my_webench.cgi/

Plug in a few values and specs for some basic circuits and it spits out proprietary components and even a PSPICE model.

[Guitar Toad]

I was playing around with this yesterday. This is really cool. Do you guys have other similar design tools that you could recommend. I know Texas Instruments has one too. Have you you ever built a high pass or low pass filter directly from these tools?