Simple Hack Turns USB Charger Units into iPhone Chargers

Image for article titled Simple Hack Turns USB Charger Units into iPhone Chargers

Apparently many USB charger units—you've probably got at least one that came free with a gizmo: I've got three—won't work to charge the iPhone. That's 'cause Apple's lovely design engineers made the phone's electronics look for the standard USB D+ and D- lines, which lots of USB chargers omit. Thanks to a simple hack, however, you can add these lines in by spoofing reference voltages instead. All it takes is a few resistors, some wire cutting and soldering, and the ability to have no fear that you're precious iPhone is going to go up in an expensive puff of smoke. The magic resistor formula is revealed below.

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Image for article titled Simple Hack Turns USB Charger Units into iPhone Chargers

The project was designed to work on 12V car USB units, and it's pretty neat, hey? Interestingly, with just a few extra tweaks you can adapt it so the circuit works with high-capacity batteries. That'll let you run your iPhone almost anywhere in the world away from power sockets. [Tzywen via Makezine]

DISCUSSION

By
sparx104

Why? Is there any reason that the damn phone couldn't just use the normal +/- lines and charge like any other device. Just another excuse to lock people into approved accessories.

And yes, I have an iPhone and am now going to have to go and buy a proper car adaptor instead of the one I hoped was going to work.