[olpc-help] External DC Power Jack Specs

[Steve Holton]

Thanks, Richard.

But do leave some fun things for the rest of us... ;-)


On Jan 17, 2008 7:30 PM, Richard A. Smith <richard at laptop.org> wrote:
> Steve Holton wrote:
>
> > A full technical description with tolerances in not available. The
> > best I can do is reference the de-facto standard Richard gave us:
> > Digikey part # CP-2195-ND
> > When I get hardware in hand, I'll seek out the original manufacturer
> > of the part. I'm sure they have a story to tell.
>
> Let me save you the trouble.
>
> http://dev.laptop.org/~rsmith/DCJACK.pdf
>
> > We should probably include in here something about the coaxial cable
> > they're using for power, if that was selected for physical
> > characteristics. Many questions here. Again, I'll know more when I see
> > one for myself.
>
> Selected to match the design of the laptop.
>
> > The Electrical Characteristics
> >>From the Wiki pages (me hopes they are correct and up to date) you'll
> > need a source which is/can:
> >
> > - Maintain supply voltage somewhere between 5V and 25V.  DC
>
> Hmm... Thats a bit off.  11V is about lowest you can go and still have
> the XO run.
>
> > - Be able to supply upwards of 15 Watts of power.
> > - Not melt down under current loads up to 3 amps.
>
> 12V 1.5 amps is full load. so 18W.
>
> > Trying to build one from DigiKey parts is a good learning exercise,
> > but probably not the best way to approach this. If I were doing this,
> > here's how I'd go about it:
>
> If you want to make a 12V supply as a constructionist learning exercise
> then there are tons of web pages describing a variety of methods.  All
> budding EE's should try to build at least 1 12V power supply. Please use
> the proper cautions.  120V AC is lethal when mishandled.
>
> If however, you just want a 12V supply that works then you can do much
> better by searching for a surplus site thats selling 12V supplies and
> either find one with a connector that works or hack off the connector
> and add one that will. Highly likely it will be cheaper, better, and
> safer than trying to roll your own.
>
>
> --
> Richard Smith  <richard at laptop.org>
> One Laptop Per Child
>
>
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-- 
Steve Holton
sph0lt0n at gmail.com