> These little fuckers are 50% efficient if you're lucky, and

JT> 60% if you stuff it up, though I don't think better than 80 is
JT> likely. 

 So, now we're arguing over 5W?

 I've actually *designed* SMPS, and like NS I claimed 85% too... but
under the optimum load condition (usually maximum input voltage and
maximum load, just before it folds over and stops). At low loads, an
SMPS is as bad as 30% efficient. And the little low-voltage ones are
worse. I'd eb realyl happy with 60%... and I know how to design coils
so they don't saturate, too.

JT> Switchmode ends up cheaper. Huge chunks of aluminium and a fan
JT> is more expensive than silicon.

 I know it's cheaper!  That's why I've actually used them in mass
production. On the other hand, the *first* one cost about $5,000. How
many in David's production run?

Regards,
Bob


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