On Fri, 9 Oct 2009 14:33:42 -0700 (PDT), "
wrote:


Filter capacitors and inductors too. It's not uncommon for switching
power supplies to be above 1MHz, also to keep the size of components
(and costs) small.

...and transformers get *very* big at DC.


I want a citation that switchers are commonly running at and above
1MHz.

NONE of ours did.