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Maybe Radioshack has a 12-24 volts > 5 volts or something
If it is a standard regulator it will still generate the same amount of heat but maybe it will be easier to get rid of. If you go for a switching regulator then there is much less heat.
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The 5V DC (!! DC !!) from the RS converter can go right into the 5V pin on the power header, along with ground.
DO NOT GET THEM BACKWARDS! You are bypassing the reverse polarity protection diode. Just be a little careful, double check the connections before powering up.
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