The physics of how your earphone jack works (just in time to say goodbye)
From the Wired Magazine website
It doesn’t matter if you call it an earphone or headphone jack—it’s still on just about every smartphone. With rumors that Apple will kill the the earphone jack on the iPhone 7 to make it thinner, I think this is a good time to look at this surprisingly simple piece of technology.
Retiree News 
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