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how to connect mic left and mic right to single TRRS mic connection. The first figure shows mic left and mic right connected to microphone output jack. I want to replace this output jack with the TRRS jack as shown in figure 2. the second figure shows Ring2 as the mic connection.

mic left and mic right enter image description here

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  • \$\begingroup\$ so, you want to combine the left and right mic signals into a single mic signal (like might be used on a smartphone or tablet)? \$\endgroup\$ – Jasen Aug 26 '17 at 19:57
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You can leave RING2 unconnected or you can connect it to sleeve. The second option means it will work on both three or four-wire cables.

3-pin            4-pin
Tip ------------ Tip
Ring ----------- Ring1
              +- Ring2
Sleeve -------+- Sleeve

By the way, the figure does not show RING2 as the mic connection.

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