3.5 mm jack/socket pinout confusion. : r/AskElectronics
Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone split… | Earphones wire, Headphone splitter, Electronic schematics