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Actaully a PSU is a very good for power. It has internal circuit breakers.
you can have voltages from 3.5 - 24 volts on a SINGLE power supply. The thing you have to watch out for is the amps. Also on the most power supplies there is a sticker that shows the voltage of the wires. I have redone a LOT of PSUs for bench power supplies for testing circuits and such and run my led spots off of a single PSU (can run 50 off one 5v line)
you can have voltages from 3.5 - 24 volts on a SINGLE power supply. The thing you have to watch out for is the amps. Also on the most power supplies there is a sticker that shows the voltage of the wires. I have redone a LOT of PSUs for bench power supplies for testing circuits and such and run my led spots off of a single PSU (can run 50 off one 5v line)