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A comment on Headphones are collecting too much personal data (2019). Parent comment

Re:Headphones are collecting too much personal data (2019) by treve on Sunday July 26, 2020 @11:47AM (#23957919)
Ever tried to connect a corded headphone into a microphone jack? It works quite well
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Re:Headphones are collecting too much personal data (2019) by wizzwizz4 on Sunday July 26, 2020 @12:06PM (#23958044)
Is there some kind of diode for AC signals?
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Re:Headphones are collecting too much personal data (2019) by formerly_proven on Sunday July 26, 2020 @12:14PM (#23958092)
Yes, they're called amplifiers. Directional coupling circuits would apply in theory, but not in practice; they're good enough to do full-duplex audio over two wires, but not nearly good enough to deal with the sensitivity of analog inputs if you want to prevent a signal from being read.
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