In message <[email protected]>, dated Tue, 15 Jul 2014, CR
<[email protected]> writes:
On 7/15/2014 2:19 AM, John Woodgate wrote:
Linear techniques these days are costly, heavy or just unfashionable.
Or mysterious to some of the recent graduate engineers today?
That's a consequence of 'unfashionable'.
It's a consequence of efficiency standards.
That really only applies to linear power supplies and some amplifiers. A
very great amount of linear stuff is low power, not within the scope of
efficiency standards.
I may be fixing EMI problems until I'm NINETY -- if the pacemaker I'll
need meets efficiency standards.
If you try to calculate the true efficiency (power out/power in) for
things that include transducers you get silly answers. Take a TV set,
for example. Electrical input 100 W, light output maybe 10 microwatts.
Same for a hi-fi: the sound power output is typically less than 1 % of
the electrical input power.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Quid faciamus nisi sit?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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