[mythtv-users] external power supply rant (Was: Zotac ION M/B..)

Simon Hobson linux at thehobsons.co.uk
Wed May 13 18:46:46 UTC 2009

Raymond Wagner wrote:

>Who cares?  DC-DC conversion is very efficient.

But still not 100% - what's the benchmark ? Something like 85%+ is 
considered good ?

I agree with your point about them being switched off a lot of the 
time, but I can think a fair number of them are going to go into 
"always on" applications.

>The real problem of concern is that 'wall-warts' are cheaply built, 
>typically linear, and always low efficiency.  They will be dumping 
>easily twice the waste heat of a traditional computer power supply.

Cheaply built - yes. But so are most PSUs :-/ For this sort of 
application they won't be linear, even small ones these days are 
mostly switch-mode, apart from anything else, I suspect switch mode 
are cheaper to build as they use less copper and iron !

But my main objection stands - external power supplies are just "yet 
another" box and cable to try and keep control of.
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
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