Comment 2 by Joerg Reisenweber, Nov 21, 2013
_plug_ specification according to http://www.gsma.com/newsroom/omtp-documents-1-0-omtp-local-connectivi ty-wired-analogue-audio-v1-0 Tip: left-out 2: right-out 3: mic-in/video-out 4|sleeve: GND socket as used in N900 yet to get checked for pin assignment to above plug-pins
Comment 3 by Nikolaus Schaller, Nov 26, 2013
Results from measuring between an open 4-wire 3.5mm plug and the test points * pin order on test points (pcb inner to PCB edge): 2 (right) - 4 (gnd1) - 1 (tip = left) - 4 (gnd2) - 3 (mic) - 4 (gnd3) * two of the three "GND" are not really grounded but activated by the insertion switch * if one looks into the hole we can see a bigger and a smaller contact right at the beginning of the hole. The smaller one is connected to the last (gnd3) and the bigger one to the first (gnd1)
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Reported by Nikolaus Schaller, Nov 12, 2013