A few questions here
- Does the carbon have some sort of input protection on the usb port(s)
- If I power it from the header +5v does that input protection still apply, or is it bypassed?
A few questions here
There is a 750mA resettable fuse on the USB 5V (PPTC) followed by a 3.3V regulator.
If you are using Header pin 11, you go directly to the 3.3v regulator. I suggest to not exceed 6.0V.