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I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy): enter image description here

I have an earphone splitter for iphones that has a 3.5mm jack as shown below: enter image description here

The problem is how do I connect the microphone pins from the 3.5mm jack? That is how do I connect the two leads marked "?" (see the following picture for what I want to achieve.) enter image description here

PS: I am not sure whether the microphone jack pinout is the same as drawn. Anybody can confirm whether this is right (the microphone jack from the headset is rose-colored and the earphone jack is green-colored)?

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  • \$\begingroup\$ The "mic" tip of the microphone plug is the audio out. The ring is probably the DC bias for the microphone. You have some more figuring out to do. \$\endgroup\$
    – Transistor
    Commented Mar 29, 2016 at 18:12

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There is no 100% sure answer to your question. Because we (and maybe you?) don't know exactly what microphone you are talking about and how it is wired. There is more than one convention for wiring microphones to TRS 3.5mm plugs.

I would first try connecting just the tip of the mic connector to "Microphone" ring on the iPhone. And if that doesn't work, I would connect BOTH the ring and the tip together to the "Microphone" ring on the iPhone.

Ref: http://www.epanorama.net/circuits/microphone_powering.html#soundcard

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    \$\begingroup\$ Connecting BOTH the ring and the tip together to the "Microphone" ring on the iPhone splitter did the trick for me. Thanks! \$\endgroup\$
    – K. Rmth
    Commented Apr 9, 2016 at 15:06

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