I have 11 - 15 volts, I need 3 or 3.3 volts @ 600ma , 1 amp preferred
You don't really need regulators in series. A power transistor in a common base configuration will easily drop half of the voltage from Vin to 3.3 or 5V and give you another package to help disipate the heat. I think a power transistor, a resistor, and a zener diode should beat the cost of a 7815 or a 7812 in front of the the 7805
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