Gaming headset 3.5mm TRS mic plug pinout

Solution 1:

According to the Intel/Microsoft PC 2001 System Design Guides, Chapter 11 - Audio, requirement AUD-0331, the pink mic-in jack is wired this way:

• Tip = mic signal
• Ring = +5V bias
• Shaft = shield/ground

So a typical gaming headset's pink mic plug must be wired accordingly.

Solution 2:

I found out that on my motherboard (Z270F) and many other boards pink microphone jack is wired in other way to support two channel audio with electret microphones.

• Tip = +3V power & left channel signal
• Ring = +3V power & right channel signal
• Shaft = shield/ground

Simplified TRS mic connection example

Not exactly answer for this question but I think it could help many confused people.

Based on my limited knowledge and some measurements.