Update on the USB charging problem of the iPhone 3G
After I posted my last article I decided to do some experimenting based on the description of the DIY iPhone 3G charger I linked to.
I checked the two travel chargers I have, and just as expected: The one that charges the iPhone 3G has a 2.4v and 2.8v reference voltage applied on the data pins in addition to the 5v charging voltage. The one that charge my iPod but not my iPhone have no voltage on the data pins.
So, I guess the solution is to make a small adapter that gives the required voltage on the data pins: USB in, ...