if you do that, make sure that your ac-dc power supply give enough juice. for instance, i used a 300mw power supply to try to get a 12v air compressor to work. basically my power supply couldnt handle the power load that my compressor needed, and i thought the compressor was fubar'd. i then used my jumper cables and hooked the air compressor up to my truck's battery and lo and behold it worked.
what's my point? dont use a really small ac-dc power supply like my dumb *** did. i just used an old cell phone charger. most of the bench units sold specifically for the purpose of having a DC power supply will be able to handle your PSU