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 enclosed. But we tried it and it worked fine with
only the power supply fan.<br>
<br>
Ismael<br><br><div class="gmail_quote">2010/5/13 Sascha Silbe <span dir="ltr"><<a href="mailto:sascha-ml-ui-sugar-olpc-devel@silbe.org">sascha-ml-ui-sugar-olpc-devel@silbe.org</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Thu, May 13, 2010 at 06:44:34PM +1000, James Cameron wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
An ATX or AT switch-mode power supply attached to a set of nine laptop<br>
charging cables. The power supply is being used as a 12V DC regulated<br>
source. The original PC power harness cables have been removed.<br>
</blockquote></div>
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 switched-on XO-1 connected to it. The XO-1 barely coped (the power light started flickering some time ago, probably due to the power supply aging and delivering an even lower voltage than before) and the XO-1.5 (without MPPT ECO) didn't like it at all (whining noise, LED off).<br>
<br>
Summary: If you're trying to replicate this setup, make sure your PC power supply regulates the 12V rail (just hook up some load and check the voltage).<br>
<br>
CU Sascha<br><font color="#888888">
<br>
-- <br>
<a href="http://sascha.silbe.org/" target="_blank">http://sascha.silbe.org/</a><br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Ismael Schinca<br>Plan Ceibal - Depto. Técnico - I+D<br>Avda. Italia 6201<br>Montevideo - Uruguay.<br>Tel.: 601 57 73 Int. 2227<br>E-mail : <a href="mailto:ischinca@plan.ceibal.edu.uy">ischinca@plan.ceibal.edu.uy</a><br>