> Companies like Maxim make chips that will use a transistor
> as a temperature sensor for use inside PC's, as the Pentium
> chips have a transistor temperature sensor built in to allow
> control of fans

Like this

http://www.national.com/ads-cgi/viewer.pl/ds/LM/LM84.pdf

from

http://www.national.com/appinfo/tempsensors/

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