Do you want to connect your GoPro Hero3/4 to external audio input and/or +5V DC power input? Our new 10 pin mini USB connector with integrated PCB makes this easy.
It has easy soldering pads for audio in 1 and 2 (do not use the pad G). At the other side of the PCB there are soldering pads for ground and +5V DC power input (the rectangular pad along the short edge is GND and the more squarish PAD at the long edge is PWR).
We also have a similar connector but there the PCB is designed for audio and video output. To make it easy to see the difference between these, we have made the mic input PCB red.
You can hear when the external mic is active as it is recording in the left channel only.