Robert Rolf wrote:
> Full wave rectifier transformers draw DC on
> each half of the secondary,

Huh?  I can't even begin to imagine where you got that from.

It's also not clear what a "full wave rectifier transformer" is supposed to
be, so I'll assume you really meant a typical transformer-coupled full wave
rectifier circuit, such as were common before switching power supplies
became cheaper.  The power line drives the primary, which is a simple
2-terminal winding.  The secondary is center tapped, and usually connected
to ground.  There is a diode at each end of the secondary, both pointing in
the same direction with respect to the transformer.  Only one half of the
secondary conducts each half-cycle, but the primary conducts both
half-cycles.  The load to the power line is symmetric to the extent the two
halves of the secondary are ballanced.


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