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#2 To calculate the AC voltage for a wall wart, measure the DC voltage with no load and divide by 1.414. That will give the no load AC voltage. Under the rated load (same load as DC rating) the AC voltage may drop a bit, but not as much as it does at DC mode. Find a power device that gives the required AC voltage, plus or minus a volt or so. Most devices requiring AC rectify it to DC internally anyway, except devices that need 60Hz for things like motors.
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