using laptop charger

[DancesWithCars]

Sounds evolutionary to use netbook power on XOs
8-/

On Wednesday, December 11, 2013, James Cameron wrote:

> Yes, there are many alternate adapters that may work well, but we
> haven't certified them.
>
> Deployments can order replacement adapters, or source their own.
>
> However the original poster wanted to avoid carrying two adapters, so
> a replacement adapter probably won't meet his requirements unless it
> can do both jobs.  ;-)
>
> There are switchable voltage third-party laptop adapters, but the
> switches on them may not be rated for daily voltage changes.
>
> On Wed, Dec 11, 2013 at 08:51:37PM -0600, Anna wrote:
> > I've used (and some of my friends have used as well) an eeepc power
> adapter to
> > charge XOs.  The connector usually works unless you've abused and/or
> jostled
> > around stuff (not me, personally, one of my adult friends is
> inexplicably hard
> > on power adapters).
> >
> > Here in Birmingham, one of the main hardware issues was that XO power
> adapters
> > went dead (usually because kids thought it was fun to twirl the flexible
> ends
> > and thus break the thin wires inside), so I'd give a kid one of my
> spares and
> > use an eeepc adapter to charge my test XOs.  I only had a few spares and
> it was
> > difficult to source power adapters.
> >
> > I'd counsel the kids, "This green power wire looks like it's fun to play
> with,
> > like you can flex it all day, but please don't do that.  It'll break the
> tiny
> > wires inside.  You know how thin the hairs on your head are?  That's
> what those
> > wires are inside the green casing, thin as your hair but made out of
> metal, so
> > you need to be careful because they'll break very easily and we can't
> put those
> > wires back together."
> >
> > Anyway, I just pulled out an old, working eeepc adapter to take a look
> at the
> > label:  Output 12V @ 3A.  Tried it on an XO-1, it appears to charge the
> > battery.  I charged XOs with this eeepc power adapter for a long time,
> when I
> > had given away all the useful "green chargers."
> >
> > Anna Schoolfield
> > Birmingham
> >
> >
> >
> >
> > On Wed, Dec 11, 2013 at 2:29 PM, John Watlington <wad at laptop.org> wrote:
> >
> >
> >     James is correct about 19V probably not working with an XO-1, but
> with an
> >     XO-1.75/4
> >     you should be fine up to 24V.
> >
> >     When running with an input voltage higher than 13V, the battery
> charger on
> >     the
> >     motherboard runs noticeably hotter.     Still within spec at 19V and
> 45C
> >     ambient,
> >     but you might notice the difference in case temperature near the DC
> input
> >     plug
> >     if charging an empty battery.
> >
> >     Cheers,
> >     wad
> >
> >     On Dec 11, 2013, at 3:09 PM, James Cameron wrote:
> >
> >     > G'day Andrew,
> >     >
> >     > There is a voltage above which the XO-1 will not charge, which had
> >     > been often encountered by people using solar panels.  Along would
> come
> >     > a cold sunny day, with a greater than normal voltage, and the
> charging
> >     > would stop.
> >     >
> >     > I don't recall the actual voltage (Richard may remember), but I
> think
> >     > it was somewhere near 18V, and it varied slightly between laptops.
> >     >
> >     > So it might work, or might not.
> >     >
> >     > Instead of using a resistor, you might use two or three large
> diodes
> >     > in series, each of which will provide a "forward voltage" 0.6V
> drop.
> >     > Pick the diodes based on the maximum current 1.85A (usually double
> >     > that), and the power that will be released as heat; P = V x I,
> where V
> >     > is 0.6, and I is not to exceed 1.85A, so 1.11W minimum "power
> >     > dissipation".  Place them in a way that does not hold the heat in.
> >     >
> >     > https://learn.sparkfun.com/tutorials/diodes
> >     >
> >     > p.s. if you find one diode does what you need, then add another in
> >     > case of variation in the supply or laptop.  You might even add a
> >     > full-wave bridge rectifier instead of two diodes, that way the
> input
> >     > polarity won't matter.
> >     >
> >     > On Wed, Dec 11, 2013 at 01:52:54PM +0000, NoiseEHC wrote:
> >     >> Hi!
> >     >>
> >     >> I am thinking about using my laptop's charger instead of the OLPC
> >     >> charger in the future as I move a lot and it's getting really
> >



-- 
DancesWithCars
leave the wolves behind ;-)
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