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The Tuesday 2008-01-08 at 17:57 +0100, Jon Clausen wrote:
<http://www.elsparefonden.org/public-and-commerce/products/energy-saving-equipment/Elspareskinne/facts-and-figures/how-the-elspareskinne-works>
But that doesn't say how this particular piece works. Typically it
would use a relays to switch off the rest of the equipment, but a
relays draws significant power from the usb bus of a portable running
on battery. What I described were methods to do the same as already
known to exist, but designed for laptops.
riiiight... I didn't realize what you meant.
Elsparefonden is not a vendor of anything, it's a trust that does research
on, and gives advice about reducing powerconsumption in general. Hence the
above doesn't pertain to any *particular* device.
Ah... I see. That wasn't clear to me, but I guessed so. Nice.
I guess that most of those thingies basically just use the power from the
USB to hold open (or closed) a relay, which turns on the mains. And that
power would come from the battery of a laptop.
Exactly.
http://www.elsparefonden.org/public-and-commerce/products/energy-saving-equipment/Elspareskinne/facts-and-figures/if-computer-cannot-turn-off-elspareskinne
suggests that the whole concept may become obsolete, if Wake-On-USB ends up
being the norm...
I didn't know that. I'll have that in mind next time I shop around for a
board.
Actually, if I needed such a thing for my desktop, I would simply get a
line from the 12 volts supply inside the box, and use it for a relays. And
an intelligent vendor would simply reinstate the output AC plug that the
original PC had, which was used to connect the monitor to, contrary to the
direct connection to the wall used nowdays. That plug could be used to
power everything the PC needs, instead of having to reinvent the wheel to
circumvent a lack of thought (or too much appetite for saving money) from
the manufacturer.
But I agree that a version designed for laptops would be good.
The snag is that they would need some power from the ac line instead, full
time, and some electronics.
- --
Cheers,
Carlos E. R.
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