[zleviticus]

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)

 

[voiceoverwizard]

In addition, unlike AC, with the DC motor varying the voltage is exactly how they are intended to vary the speed. Small animals will not be blinded but small children may be scared sensless moohahaha

 

[ceculsk]

For a rocking chair sing a wiper motor we used a 12 v battery charger to power it. We hooked up a light dimmer before the battery charger to control the volts and amps. Worked like a charm.