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SMS

On 9/6/2013 10:28 AM, wrote:

snip

USB is a standard. Any charger or device with a USB A plug will be
wired the same.

If only that were true! Well the first part is true, USB is a standard.

The second part is, unfortunately, not true.

What _is_ true, is that the +5 and GND pins will be wired the same. But
what often matters is how the data pins are wired. Apple has a specific
standard for the data pins based on how much current the charger can
supply. Other manufacturers do different things. For example Asus, on
the Google Nexus 7, requires that the data pins be shorted together to
charge from a charger (not from a PC of course).

Then you use a "standard" USB a to usb micro, or mini,
or special, cable as required by the device

It's possible to construct a cable that works, or in some cases, buy a
cable that has been modified so the data pins are correctly wired. You
can also modify the charger, i.e.
http://www.instructables.com/id/Modify-a-cheap-USB-charger-to-feed-an-iPod-iPhone/.