Take a look at GMR devices from http://www.nve.com.
They have switches "digital output" and analog outputs.

At 10:21 PM 2/20/02 +0000, you wrote:
>Has anyone had experience with Magnetically activated switches? I am
>looking for experience and insight with a "behind the panel" scenario.
>Just need one input. Specifically I'd like to learn about good devices,
>hidden 'gotchas', low cost alternatives, etc. Thanks and appreciate any
>and all insights. Have a great day
>
>Cheers,
>
>Kevin
>
>PS: If this is really and [OT], just let me know and I'll be happy to
>change the subject. Thanks.
>
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Larry G. Nelson Sr.
mailto:L.Nelson@ieee.org
http://www.ultranet.com/~nr

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