Created by the local techs of our deployment in Caacupé:
http://oficina.paraguayeduca.org/~rgs/multiple-chargers/
Raúl
___
Devel mailing list
Devel@lists.laptop.org
http://lists.laptop.org/listinfo/devel
On Wed, May 12, 2010 at 05:31:57PM -0400, Raul Gutierrez Segales wrote:
Created by the local techs of our deployment in Caacup??:
http://oficina.paraguayeduca.org/~rgs/multiple-chargers/
Neat.
An ATX or AT switch-mode power supply attached to a set of nine laptop
charging cables. The power
On Thu, May 13, 2010 at 06:44:34PM +1000, James Cameron wrote:
An ATX or AT switch-mode power supply attached to a set of nine laptop
charging cables. The power supply is being used as a 12V DC regulated
source. The original PC power harness cables have been removed.
FWIW, I've also used a
That is probably a wrong analysis of the problem.
Many higher power supplies like AT/ATX power supplies don't
work properly when unloaded. I bet if you draw a couple of
amps from the +5V supply, you would find that the +12V supply
starts working fine.
I used to use car headlights to provide
We did this in Uruguay. It's difficult to ensure proper regulation on the
12V rail. You have to have a proper load to ensure stability. A good power
supply of course helps. To improve this you can put a resistor in the 5V
rail. Of course it wastes some power and the heat is a concern if it's
Exactly, some load in the 5V rail is needed.
We managed to charge up to 20 XO using a single 680W power supply.
In any case, the total power of the supply is not important, you must check
the 12V rail current rating (and estimate approx 1.5A per XO).
Also, some power supplies have more than 1 12V
On Thu, May 13, 2010 at 09:24:17AM -0400, John Watlington wrote:
FWIW, I've also used a ATX power supply to power an XO-1, but stopped
doing so once I discovered why the XO-1.5 would run from it: Being a
cheap model, it regulated only the 5V rail, so the 12V rail dropped
down to 9V with a
On May 13, 2010, at 10:18 AM, Sascha Silbe wrote:
On Thu, May 13, 2010 at 09:24:17AM -0400, John Watlington wrote:
FWIW, I've also used a ATX power supply to power an XO-1, but stopped doing
so once I discovered why the XO-1.5 would run from it: Being a cheap model,
it regulated only the
Sascha, that's correct, once the 5V rail is loaded the 12V rail is properly
(properly depending on the power supply quality) regulated. Apparently,
switched power supplies need a proper load to correctly regulate voltage.
You may try something like 1A in the 5V rail. Be sure to use a resistor
