Jack -> RCA
The RCA connector, also known as phono connector or cinch connector, is a type of electrical connector used to carry very low voltage audio or video signals. The name derives from the RCA company that designed it in the forties. In the fifties, as the high-fidelity home audio systems became more and more popular, the RCA connector began to replace the Jack and DIN connector in the audio components. The RCA connector is cylindrical in shape and has two contacts. In the male the first contact consists of a central metal pin, around it is a metal ring which acts as a second contact, generally used as a mass.