I'm using a 400 watt converted PC power supply. Delivers about 6 amps at 12 volts, 16 amps at 5 volts ( useful for led lighting etc ). The mount flashes it's power led slowly as though it is low voltage but there is plenty of current so it works perfectly. Well regulated and cheap as, plenty of old PCs thrown away. Just google for a circuit, easy to do and the supply is quite small for it's capacity.
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