I always assumed they had something to do with the telephone system, and that’s right, but I had no idea how old they really are and how they’ve evolved. Turns out the venerable plug goes back ...

it is a plug and socket widely used for analog audio signals in portable devices. For example, the headphone jack on iPods, tablets and portable DVD players is a mini-phone socket. THIS DEFINITION ...

For decades, both RCA and the smaller mini-phone 3.5mm connectors have been the most widely used plugs and sockets on consumer audio equipment (see mini-phone connector). An RCA connector is also ...