Hey, everyone

How clean of a source is the 12v stereo power supplied by a car? I've noticed it can vary from (in my car) 11.5v off the battery to almost 14v when the engine is running. I'm thinking that it's not a very well regulated source. So how likely is it that spikes and noise can make their way into the circuit being powered? The vehicle in question is a 1991 Geo Prizm (basically a Toyota Corolla of the same era).

I ask because I'm not sure what kind of protection might be needed in a circuit to be powered by such a source. If it's a significant problem, what can be done about it?


Thanks, and happy Friday

-Tony

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.