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phenol said:it could work if you put a real regulator on its output following the enhanced example in woop's link. you should use a schottky rectifier or a fast recovery diode and..say...10-22uF filter cap and then, in the place of the LED, hook DDL's regulator or smth along the lines of LM7805 followed by a resistor (for low power bluray) or better yet low drop regulators, such as BA05T or LM2931 (<100mA) for better efficiency.