alt Hacker NewsThe CIA…plug a set of regular headphones into a microphone jack, open a recording application and speak into the headphone speaker, you don’t need a 3 letter agency for that physics open secret.
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tclancy • yesterday at 2:43 PM
I am crap with physics but was going to say I think the last 50+ years of speaker development has been about making them less a microphone than they inherently are.
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Wouldn't you need to rewire the headphones? Headphones use a 3-pin TRS whereas a 4-pin TRRS plug is used when you add a microphone. Regardless if the 4-pin is CTIA or OMTP, it's generally only going to get shorted to ground if a 3-pin TRS plug is plugged into a 4-pin TRRS socket, or if a 4-pin TRRS plug is plugged into a 3-pin TRS socket.
Diagram: https://i.sstatic.net/8rSD2.jpg