Depending on the current draw of the circuit's load, can result in a large heat dissipation for a voltage regulator if its surface area and heat sink are insufficient.
For my use, dropping from 12V to 5V with microcontroller + air compressors + solenoids(~55mA each) is causing significant overheating on the Arduino board.
source: http://forum.arduino.cc/index.php?topic=180819.0
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