Quote:
Originally Posted by FJames
How are you measuring that without cutting into the charger cord on the DC side? I'm not sure a power reading on the AC side would accurately reflect the DC output.
You're right that the Aura USB input is labeled 0.8 amps, but so is the Touch. I always assumed that the maximum draw of both would be the normal USB limit of 500ma, but maybe they will both draw up to 800ma. Many computer USB ports actually will supply up to 800ma, so I'm not sure there would be any difference in charge time to be noticed.
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I'm using a USB breakout box -- basically an A plug on one side, a A socket and a micro-B plug on the other with the 4/5 wires brought to jumperable test points. It comes in handy when I want to scope the data lines or check the voltages on the V+/V- lines. For current, I pull one of the voltage line jumpers and use the DMM to bridge the two pins. You can also add resistors across the data lines or from the data lines to ground.
The design is very similar to several projects on the internet with the added 5th pin connection for the micro USB port with a replaceable resistor to ground. Other than cutting up an USB extension cable for the A socket and plug and using the micro-B end of a damaged A to micro-B cable, the rest of the components were mounted to an old chunk of Vector prototyping board I had kicking around. Ugly as homemade sin but it works.
Regards,
David