In electronic equipment, various connectors are used for electrical connection between discrete components or integrated circuits and printed circuit boards, between substrates and drawers, and between drawers and rack panels. There are many types of connectors. According to their appearance and purpose, they are divided into round and rectangular sockets; printed circuit board sockets; earphones and earplug sockets; power plug sockets; high-frequency sockets; banana sockets and so on.

With the development of electronic technology, especially microelectronics technology, solid-state relays suitable for various purposes have appeared one after another, such as the so-called parameter solid-state relays (which can be directly connected with various sensitive devices such as heat, humidity, magnetism and photosensitive to form automatic control System), liquid level solid state relay (used in automatic water boiler) and two-way transmission solid state relay (used in constant temperature automatic controller, automatic water sprinkler, anti-theft alarm), etc., their pins are also different , Be careful when applying.

In the past, plugs and sockets were more common in amplifiers, record players, and audio equipment with 6mm (6.35mm) and 8mm diameters. Nowadays, audio and video recorders still mostly use 6mm plug sockets. They are mainly used as microphone and earphone plug sockets. In electronic production and some pocket-sized home appliances, 3.5mm and 2.5mm plugs and sockets are widely used.

The text symbols of the plug and socket are represented by XP and xs respectively. In the old standard, the plug is represented by CT and the socket is represented by CK. The most commonly used plug ring is the two-pin plug socket. Stereo headphones often use a three-core plug, and the corresponding socket is also a three-core plug. Regardless of the size of the plug socket and the number of cores, most of them have switching functions.

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