They don't kick out all the rf crud that switch modes do. I think also the
main inefficiency is in the transformer itself. The switch mode supplies use
a high frequency to aid efficiency, but in my view they do nasty things to
stuff they are used with, like crash computers etc. I really think the main
reason most manufacturers went to smpsus was weight in transit from the far
east!

Brian

--
From the Sofa of Brian Gaff Reply address is active
wrote in message
...
Hello,

I was looking for a PSU to power a child's toy but found that the CPC
web site says "not for domestic use" against all their linear power
supplies because they do not comply with energy saving regulations.
What's this about and when did that start? Are we supposed to use SMPS
for everything now? If so, why are they still selling linear power
supplies; there must be an advantage?

Thanks,
Stephen.