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Originally Posted by alexander
oh and transformers do work on variable DC, since you get a wave, and thus the oscillation of charge from positive to negative, a magnetic field will be generated by the tranformer coil and you will induce a current in the second coil, so you are all set 
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I'm assuming you mean square waves with variable DC? When you have square waves input to a transformer, the output instead of having a nice square waves is a series of delta function pulses timed to the square wave rise time. These delta functions aren't fit for much in the way of running something.
-Will