for D750i, K310a, K310i, K310c, K320i, K510a, K510i, K510c, K610i, K610im, K618i, K750c, K750i, K758c, K790i, K790c, K790a, K800i, M600i, M608c, S500i, P990i, V630i, W580i, W710i, W710c, W712a, W850i, W950i, Z520a, Z520i, Z520c, Z525i, Z525a, Z530c, Z530i, Z550c, Z550i, Z550a, Z558i, Z558c, Z610i, Z710c, Z710i, W300i, W300c, W550c, W550i, W600c, W600i, W700c, W700i, W760i, W800c, W800i, W810c, W810i, W830i, W830c, W900c, W900i, W958c and some other new SE
Pin Signal Description
1 USB +5V in USB 5V supply - in K750 not used
2 SP_REF Reference / headphone gnd
3 Mic+/AUXIN_L Microphone+ / AUX Input - left / Short to 4 for Answer button (*)
4 Mic-/AUXIN_R Microphone- / AUX Input - right / Short to 3 for Answer button (*)
5 DFMS/SP_L DFMS / headphone speaker - left
6 DTMS/SP_R DTMS / headphone speaker - right
7 VIDEO/STB Video / strobe
8 VPPFLASH Short to pin 9 for handsfree detection (use a 130 ohm r)
9 GND Ground
10 CTMS / USB DATA+ CTMS / USB+ (data) - in K750 not used
11 CFMS / USB DATA- CFMS / USB- (data) - in K750 not used
12 Charge In Battery charging (+5V) - in K750 not used
* CTMS stands for Control To Mobile Station
* CFMS stands for Control From Mobile Station
* DTMS stands for Data To Mobile Station
* DFMS stands for Data From Mobile Station
The key is near pin1
If you want make a stereo converter with a SE socket, you will be used 5 and 6. pins. It may not work well with an amplifier due to low output i.e just enough to power for headphones . (May need pre-amp).
to make a stereo-amp using the cell phone you must to be Short the pins 8 and 9. And connect the outputs (L) (R) (GND) using the pins 5 = (L) 6 = (R) 9 = (GND).
However, note that the Original Sony-Erisson Walkman headset is connected using pins 2 (GND), 5 (L) and 6 (R).
(*) Use a push button to shortcircuit pins 3 and 4 to pick up / hand up / off an incoming call