[olpc-help] External DC Power Jack Specs

[jim stockford]

    anybody able to specify the parts needed to make
a replacement? i'm guessing something like:
* transformer
* diode bridge
* two-conductor cable
* connector
* other?
(the above list is insufficient because it doesn't spec
the transformer, diode bridge, and cable, needs
something like Xformer:10:1 stepdown 2A secondary;
diode bridge 3A at 50 VDC; two-conductor cable #22
stranded...; connector must be wired positive exterior
negative interior; necessary disclaimer: "if you do this,
you're nuts and you void any warrantees".)


On Jan 15, 2008, at 1:06 PM, Richard A. Smith wrote:

> pgf wrote:
>
>> there was some worry (over in the "other" forum :-) that using a
>> narrower barrel could cause undue stress on the pin, since the plug
>> would no longer be properly supported, physically.   for a 4.75
>> barrel OD, do you think this is, or might be, an issue?
>
> Did anyone have any hard data supporting this concern? I think after 
> say
> 500k cycles of insertions there _could_ be something there, but I'd
> doubt it.
>
> I don't think I've ever seen such a failure in this style of DC jack.
> I've _repaired_ hundreds of these type jacks but those are always the
> case of somebody tripping over the cord and/or dropping the device
> yanking on the jack and breaking it.
>
> That or cracked solder joints where it mounts to the PCB causing a bad
> electrical connection.
>
> -- 
> Richard Smith  <richard at laptop.org>
> One Laptop Per Child
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