Running DC device off AC
Just find (practically) any wall wart (adapter) rated for AC in to 12v DC out and wire it up. I've done this many, many times for art projects that required a dc input to run little motors/lights, etc. and I've never had a problem.
IF there is any reason not to do so, or precautions to be taken, the guys here will chime in shortly and correct me, or add to the topic.
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to see some of my original magic tricks and trick boxes!