Microphone Cable for iPod Touch, iPad & iPhone Audio Recording
Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone split… | Earphones wire, Electronic schematics, Headphone splitter
Apple Headphone is Not Working On Android or Windows Phone
Phone Headset Pinouts – The Smell of Molten Projects in the Morning
swift - Get input of switch control via headphone jack on iOS - Stack Overflow
Blackmagic Forum • View topic - Pinout for Constellation Intercom XLR5
Apple hides a secret circuit inside the Lightening-to-3.5mm adapter
Reverse engineering: Remote-control headset
There are 5 contacts on an Apple 3.5mm mini-jack connection, do you know what each is for and how it is wired? - Quora
How to Hack a Headphone Jack
Analyse signal from Earphones with microphone - Project Guidance - Arduino Forum
DIY Audio Electronics from Zynsonix.com: Headphone Connectors & Pins / Pinouts for DIY