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 <w...@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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