> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Dumitru Stama
> Sent: Thursday, November 30, 2006 5:58 AM
> To: piclist@mit.edu
> Subject: [EE] Old cars - gadget
> 
> The question i have though is the folowing : What precautions 
> i will have to take in order to have an usable product which 
> does not crash when the voltage varies a lot ? I mean should 
> i use a special 12v to 5v converter instead of 7805 ?

I used the LM2940 in a recent project.  It's designed for the automotive
environment so has protection for reverse polarity, 24 volt, load dump,
etc.

--steve


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