My laptop has a combo headphone jack. When I plug a 4-pin headphone/earphone, it works fine, but when I plug in a 3-pin microphone, it doesn't work and no audio comes out.
Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
How to Hack a Headphone Jack
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Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
3.5mm Mini Female Jack Stereo 4 Pin 4 Wire Audio W/ Cable Cord Connector DIY 1FT | eBay
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Audio Jack Switches and Configurations | DigiKey
How to Hack a Headphone Jack
