Floyd L. Davidson wrote:

David Maynard wrote:

Floyd L. Davidson wrote:


Robert Baer wrote:


A supply could be rated at 1000A and work no differntly than
one rated at 1700mA.
It is the *voltage* rating that one must be cautious about.

Almost, but not quite. If a DC supply is significantly under
loaded,
the voltage will rise.

That's true if it's unregulated but the voltage change with a
regulated supply is negligible.


That would depend on the regulation,

Not really. If the voltage significantly changes then it isn't 'regulated'.
That's what the word means in this context.

but regardless... I've
never seen a regulated wall wort.

There are lots of 'em, even in the traditional 'wall wort' form factor.
Even more common in the brick form factor.

A regulated wall wort in the power range being discussed would likely be a
switcher rather than linear.

I don't feel like bringing the network down to put a meter to it but I'd
bet the 5V 2.5A wall wort to my D-link 614+ is a switcher because I don't
see any way a 12.5VA transformer could fit in the 1.75x2.25x1 inch case,
plus there's no weight to it, and the model number, SMP-xxxxx, looks
suspiciously like an engineer's "Switch Mode Power" supply acronym.