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iPhone Headphone plug pinouts - Friend Michael
https://friendmichael.com/Blog/iphone-headphone-plug-pinouts.html#:~:text=What%20are%20the%20iPhone%20headphone%20plug%20pinouts%3F%20Green,1st%20contact%2Fleft%20headphone%20Red%20is%202nd%20contact%2Fright%20headphone
iPhone Headphone plug pinouts - Friend Michael
https://friendmichael.com/Blog/iphone-headphone-plug-pinouts.html
What are the iPhone headphone plug pinouts? Green is 1st contact/left headphone. Red is 2nd contact/right headphone. Red/Green Combo …
Four-pin pinout - Apple Community
https://discussions.apple.com/thread/1114891
Inserting a 3-pin plug into the iPhone's 4-pin receptacle would also short Mic to Common. That wouldn't hurt anything and would allow the L/R earphones to work correctly. It also Stops/Starts the iPod, just as the switch would. You will not get access to the Microphone without a 4-pin plug. I found 4-pin connectors at Arcade-Electronics.Com.
iPhone 4 audio jack pinout at DVinfo.net
https://www.dvinfo.net/forum/all-things-audio/495550-iphone-4-audio-jack-pinout.html
For mic in, you want the docking connector on the bottom of the iPhone. The Fostex AR-4i adds external microphones to the iPhone by this route. And yes, it comes complete with an app for controlling levels, EQ, etc. and a headphone jack for monitoring. It actually looks like a fairly complete solution to adding external mics to an iPhone.
Apple iPod, iPad and iPhone dock · AllPinouts
https://allpinouts.org/pinouts/connectors/portable_device/apple-ipod-ipad-and-iphone-dock/
Apple Lightning connector pinout diagram @ pinouts.ru
https://pinouts.ru/CellularPhones-A-N/apple_lightning_pinout.shtml
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