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I have the following TRRS audio female socket meant for audio/stereo headset. As i understand the tip(2) is for left channel, the ring(3) is for right channel, the sleeve(1) is for ground. Now which connection 10 or 11 is used for microphone?

enter image description here

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The jack you have shown is a TRS jack, not TRRS.

Terminals 10 and 11 are switch contacts. With no plug inserted, terminal 3 is connected to terminal 11, and 2 is connected to 10. When the plug is inserted, these connections are broken.

If this was used as a headphone jack, the amplifier outputs would be connected to 2 and 3, with internal speakers connected to 10 and 11 - when a plug is inserted, the internal speakers would be disconnected.

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  • \$\begingroup\$ all of the audio connectors looks same, is there a way to know which is TRS and TRRS from outside? \$\endgroup\$ – ravikumar Jun 7 '17 at 16:20
  • \$\begingroup\$ is this SparkFun TRRS 3.5mm Jack Breakout implement microphone? sparkfun.com/products/11570 if so which one is the microphone connection? \$\endgroup\$ – ravikumar Jun 7 '17 at 16:31
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    \$\begingroup\$ Yes, that Sparkfun jack is TRRS. I haven't looked at headphone/microphone connections, but I would assume that the "Ring 2" connection would be the microphone (but I think I've heard that these connections are not entirely standardised). \$\endgroup\$ – Peter Bennett Jun 7 '17 at 17:13

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