RCA terminal (RCA jack, or RCA connector), commonly known as plum blossom head, lotus head, is a widely used terminal, which can be used in analog video/audio (for example AV terminal (three-color cable)), digital audio (Example: S/PDIF) and color difference component (Example: color difference terminal) transmission, etc.
use
In the most common use, there is a standard plug at both ends of the wire, and there is a male terminal in the center, surrounded by a ring, which is sometimes discarded due to flexibility. The device is equipped with a socket, and there is a small hole in the center surrounded by a metal inner ring. The diameter of the outer ring of the socket is smaller than that of the plug to allow the plug to be firmly inserted. The inner and outer rings on the socket are filled with insulators, usually filled with plastic.
Compared with other types of terminals, RCA terminals have a different purpose from the original, including power terminals, radio terminals, and speaker wire terminals. It is very popular as an AV terminal (composite video terminal), but its impedance matching performance is poor. RCA terminals and cables are also commonly used to transmit S/PDIF digital audio, and are distinguished by orange plugs, also known as "coaxial cables."
The connection method is to push the plug into the socket of the device (commonly known as female). The signal transmission needle protrudes from the plug. Usually, the needle is in contact with the socket before the grounding ring of the two sides (referring to the device and the plug) touches, and it will make a buzzing or chirping sound when connecting the activated sound device. If the plug is partially dropped (the ground is broken but the signal is not broken), a continuous noise will be emitted. In addition, for some plugs, especially the cheapest ones, the tightness and effectiveness of the grounding sheath will be greatly reduced.
When used as an AV terminal, RCA plugs are often distinguished by color. Yellow is used for composite video. In analog stereo audio, white (or black) is used for the left channel, and red is used for the right channel. "Yellow, white and red" these jacks almost all audio-visual equipment are also installed. There is at least one pair of "yellow, white, and red" jacks on the TV for connecting to camcorders (through 3.5 mm mini TRS terminals to three RCA terminals, also known as "mini RCA"), digital cameras, and home game consoles. Although almost all audio-visual terminals, including audio, composite and component video, and SPDIF digital audio, can be used with wires with a characteristic impedance of 75 ohms, there are some special-purpose wires on the market that have higher resistance values.
The diameter of the male pin of the RCA terminal is 3.175 mm, and the diameter of the surrounding shell is 8.25 mm.
Disadvantage
One of the shortcomings of RCA is that whenever an independent signal is needed, an independent cable is required. Too many cables, on the one hand, cause difficulty in wiring, in addition, after the cables are connected, the messy cables also affect the appearance.
In order to get rid of the annoying cables, there have been countless terminals launched, hoping to transmit audio and video at the same time, but it is difficult to become an international standard-it is worth noting that in Europe, SCART is a great success.
origin
The RCA terminal is also called "phono connector", literally translated as "phonograph interface" because at first this kind of terminal was designed to connect the phonograph and the radio receiver-things before the birth of the semiconductor radio.
Radio Corporation of America (RCA) adopted this connection method in most of the radios in the 1930s, which is why this connector got its name.
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