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It sounds to me like your best bet if you dont want to buy something like a Opus PS is to use the 12V parts from a sproggy PS. It uses the LM2587T buck/boost regulator to supply about 2A at 12V with an input of about 8-24V or somewhere around there. If you really need more than 2A then you may want to look at getting a laptop power supply for a car that is 12V or a little more and regulate it down to 12V. The big problem with that last idea is the laptop PS can cost a lot of money. Check ebay they may have some cheap.
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Via Epia M9000, Opus, and a cool custom case. All in my Saabaru 9-2X Aero.
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