Headphone jack 'flashback'

Doing enough 'retro' articles myself, I'm also glad to highlight interesting pieces in similar vein from others. Here we have a nice 'history of the humble headphone jack', from century-old 1/4" beginnings, through 2.5mm variants, to the ubiquitous 3.5mm and then multiple microphone 'ring' standards and Type C audio adapters... Recommended.

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