RJT> JD> Roy,
RJT> JD>  Analog power supplys (modem wall-warts, etc.) like either
RJT> JD> pure sine-wave power or at least modified sine-wave.
RJT>Hmm,  I wouldn't have thought that they would be that fussy.  I guess 
it's the
RJT>transformers?
RJT> JD> Square waves are OK for switching power supplies as in
RJT> JD> computers. Some stuff is really fussy, and will overheat with
RJT> JD> anything less than pure sine wave; I'd suspect that motors
RJT> JD> would be in that catagory.
RJT>Motors?  Why is that?
Roy,
 Both motors and transformers are inductive devices and square waves
aren't kind to them.
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