On Sat, 10 Oct 2009 13:30:57 -0500, The Daring Dufas
wrote:

Archimedes' Lever wrote:
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.

I've never seen a switching power supply that ran at 1Mhz.

They're really not uncommon today. LTC has a pile of 'em. Hint:
ignore DimBulb. You won't learn anything from him. He's AlwaysWrong
and dumber than even you are.