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
Guide] Audio-/Headphone Jack Information Thread - sudomod
Priv Headset Jack Pinout - BlackBerry Forums at CrackBerry.com
Guide] Audio-/Headphone Jack Information Thread - sudomod
Understanding Audio Jack Switches and Schematics | CUI Devices