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hi atom,
In the UK you would get problems with the police with that project.
I've been taking apart automotive electronics for years and I've seen 7805's in quite a few automotive "modules". I'm going to look at some of the old spares I keep around and see what else they have in conjunction with the 7805 to see if they're taking special precautions.I have to agree with Mark. Others have used non automotive regulators but I would not do so esp on a device I was selling. Murphy will get you. If there were no possibility of problem they would just use common regulators on cars.
The LM2931 are under $1 each. I have purchased them in 25 unit lots for maybe 35 cents. It is 100mA but I have found similar regulators in the TO-92 case up to 300mA. Next time you order pick up a few.
3v0