Sounds evolutionary to use netbook power on XOs <div><span></span>8-/<br><br>On Wednesday, December 11, 2013, James Cameron wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Yes, there are many alternate adapters that may work well, but we<br>
haven't certified them.<br>
<br>
Deployments can order replacement adapters, or source their own.<br>
<br>
However the original poster wanted to avoid carrying two adapters, so<br>
a replacement adapter probably won't meet his requirements unless it<br>
can do both jobs. ;-)<br>
<br>
There are switchable voltage third-party laptop adapters, but the<br>
switches on them may not be rated for daily voltage changes.<br>
<br>
On Wed, Dec 11, 2013 at 08:51:37PM -0600, Anna wrote:<br>
> I've used (and some of my friends have used as well) an eeepc power adapter to<br>
> charge XOs. The connector usually works unless you've abused and/or jostled<br>
> around stuff (not me, personally, one of my adult friends is inexplicably hard<br>
> on power adapters).<br>
><br>
> Here in Birmingham, one of the main hardware issues was that XO power adapters<br>
> went dead (usually because kids thought it was fun to twirl the flexible ends<br>
> and thus break the thin wires inside), so I'd give a kid one of my spares and<br>
> use an eeepc adapter to charge my test XOs. I only had a few spares and it was<br>
> difficult to source power adapters.<br>
><br>
> I'd counsel the kids, "This green power wire looks like it's fun to play with,<br>
> like you can flex it all day, but please don't do that. It'll break the tiny<br>
> wires inside. You know how thin the hairs on your head are? That's what those<br>
> wires are inside the green casing, thin as your hair but made out of metal, so<br>
> you need to be careful because they'll break very easily and we can't put those<br>
> wires back together."<br>
><br>
> Anyway, I just pulled out an old, working eeepc adapter to take a look at the<br>
> label: Output 12V @ 3A. Tried it on an XO-1, it appears to charge the<br>
> battery. I charged XOs with this eeepc power adapter for a long time, when I<br>
> had given away all the useful "green chargers."<br>
><br>
> Anna Schoolfield<br>
> Birmingham<br>
><br>
><br>
><br>
><br>
> On Wed, Dec 11, 2013 at 2:29 PM, John Watlington <<a>wad@laptop.org</a>> wrote:<br>
><br>
><br>
> James is correct about 19V probably not working with an XO-1, but with an<br>
> XO-1.75/4<br>
> you should be fine up to 24V.<br>
><br>
> When running with an input voltage higher than 13V, the battery charger on<br>
> the<br>
> motherboard runs noticeably hotter. Still within spec at 19V and 45C<br>
> ambient,<br>
> but you might notice the difference in case temperature near the DC input<br>
> plug<br>
> if charging an empty battery.<br>
><br>
> Cheers,<br>
> wad<br>
><br>
> On Dec 11, 2013, at 3:09 PM, James Cameron wrote:<br>
><br>
> > G'day Andrew,<br>
> ><br>
> > There is a voltage above which the XO-1 will not charge, which had<br>
> > been often encountered by people using solar panels. Along would come<br>
> > a cold sunny day, with a greater than normal voltage, and the charging<br>
> > would stop.<br>
> ><br>
> > I don't recall the actual voltage (Richard may remember), but I think<br>
> > it was somewhere near 18V, and it varied slightly between laptops.<br>
> ><br>
> > So it might work, or might not.<br>
> ><br>
> > Instead of using a resistor, you might use two or three large diodes<br>
> > in series, each of which will provide a "forward voltage" 0.6V drop.<br>
> > Pick the diodes based on the maximum current 1.85A (usually double<br>
> > that), and the power that will be released as heat; P = V x I, where V<br>
> > is 0.6, and I is not to exceed 1.85A, so 1.11W minimum "power<br>
> > dissipation". Place them in a way that does not hold the heat in.<br>
> ><br>
> > <a href="https://learn.sparkfun.com/tutorials/diodes" target="_blank">https://learn.sparkfun.com/tutorials/diodes</a><br>
> ><br>
> > p.s. if you find one diode does what you need, then add another in<br>
> > case of variation in the supply or laptop. You might even add a<br>
> > full-wave bridge rectifier instead of two diodes, that way the input<br>
> > polarity won't matter.<br>
> ><br>
> > On Wed, Dec 11, 2013 at 01:52:54PM +0000, NoiseEHC wrote:<br>
> >> Hi!<br>
> >><br>
> >> I am thinking about using my laptop's charger instead of the OLPC<br>
> >> charger in the future as I move a lot and it's getting really<br>
> </blockquote></div><br><br>-- <br>DancesWithCars <br>leave the wolves behind ;-)<br><br>