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1  Forum 2005-2010 (read only) / Exhibition / Re: Motorcycle Control Panel with Arduino + Bluetooth on: June 09, 2009, 10:01:01 am
Color me confused, but why not do a 2 stage regulation? The mobile vehicle power system is horrible, to put it mildly. I can't speak for bikes, but voltage swings from just under 12V (before start) to 15+ are common in cars. As well as all manner of hash, noise,etc.  If  you still want to use the arduino regulator, stick a L7809ABV (SMTMicro) between the car's supply, and the arduino. That will take 10.5-26V, and convert to regulated 9V - which you can then feed the arduino. Yes, it's a little lossy, but it provides a secondary level of protection. (This assumes you don't need 12V)  the LM7812ACT would give you 12V, but it needs 14V in - a bit iffy when the engine is not running.
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