Ok, I've tried twice to come with a circuit that will regulate a cars voltage to 12 volts. Reason being, I bought one of the cheaper 200 watt unregulated power supplies and an ITPS and am now in a bad position. As far as I can tell nobody offers circuits for this task that cost less than $70 so I am asking for help. If you have any idea on how to build a regulator circuit that can handle between 10 and 20 amps I'd appreciate your input. I have looked into both Linear and Switching Regulators and from what I see both of them would require that I first boost the voltage to around 20-25V DC and then scale it down. I am not looking for a unit that can survive cranking, however after I turn my car off, it has to be able to output 12 volts so that the computer won't crash instead of gracefully shutting down. The simpler and cheaper the circuit the better, but at this point I'll take just about anything I can get. Thanks.
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Regulating Car's Voltage to 12 Volts