I need run arduino at 30V DC supply.. Which regulator should I use to drop the 30V DC to 5V DC..?? The maximum current drawn by the circuit will be around 500mA - 800mA I dont want the regulator to get much hot, as I dont have much place for a heatsink..

Which regulator for 30V DC to 5V DC

CrossRoads May 1, 2014, 1:30pm 2

Use a DC-DC convertor, also known as switching regulator.
Some examples:

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