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How a Leather Cover Crashes the Kindle
An anonymous reader writes "Amazon has started offering refunds to Kindle owners who own the unlit leather case who claim that it causes their Kindles to reboot, but are playing dumb on the cause: "our engineering team is looking into this." People have been wondering how a leather cover could possibly crash an electronic device, and why is Amazon offering money back if they don't think there's a problem? It seems that some of the folks over at Connectify have figured it out, and it's a doozy!"
not owning a Kindle I don't understand why there is even a need to have the two "hooks" connected in any way by a piece of conductive material.
They are not powering a lamp, they just keep the Kindle attached to the leather case.
I like microcars
The flaw is certainly in the cover(using two physically separated hooks, rather than a single piece of metal, would not have been rocket surgery and would have provided dielectric strength high enough to resist pretty much any voltage that wouldn't also kill the user.) However, we really have no way of knowing whether the cover maker failed to follow amazon's orders, whether amazon failed to issue the correct orders, or who was responsible for considering the situation where the + hook and the - hook are not separated by an LED and current limiting resistor.
If amazon didn't think about it, or naively thought that a thin layer of cheap paint would do, they fucked up. If the cover maker looked at a design document that said "Connecting hooks must be electrically separate" and said "eh, one painted part is cheaper than two physically disconnected parts, paint'll do." then they fucked up.
If you RTFA, you'll see the hooks are totally different. You're in the right vein, though. The unlit case looks like it uses a single strip of cut metal for the attachment hooks, a pretty simple design, and much cheaper than making hooks that aren't shorts.
My guess is the only reason they're painted black is because they were aware of this problem and thought that would fix it good and cheap. Or the paint is simple corrosion prevention and they didn't know...
When you're afraid to download music illegally in your own home, then the terrorists have won!
Plastic has the virtue of being non-conductive, but my guess is that such a tiny part made in plastic could be problematic in terms of strength.
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