Direct current (DC) is a form of electrical energy. Since most wall sockets provide alternating current (AC), the electrical current needs to be converted before it enters the device. A large box transformer will convert the electrical energy so that the power cord can be passed through the DC connector. There are several different designs of these connectors. The most common is a simple round plug, but there are also some special styles.
There are many differences between DC connectors and ordinary connectors.
1. Smaller current and voltage ratings
The DC connector is a type of DC connector that is specifically used to transmit DC power to the device. Compared with other connectors, they have lower current and voltage ratings and are mainly used for 12 V DC.
2. Installation method
The DC jack is connected to a wire that flows downward from the DC adapter or battery eliminator. The DC socket is soldered to the circuit board to which the DC socket is to be connected. DC sockets are usually mounted on the edge of the PCB, so there are no other components to prevent the pins from entering the connector. You can always find the ON/OFF switch and the power indicator LED next to the DC outlet. The DC socket is a simple cylindrical structure, and the two contacts are separated by an insulating structure, but the DC socket is not that simple. Even though DC jacks have only two contacts, most DC jacks have three pins. The outer cylindrical contact is GROUND, and the inner pin is positive.
3. DC socket design
Although most circuit boards have batteries attached, we can still plug in an external DC adapter to operate the circuit. The pin structure of the DC socket is used to separate the GROUND terminal of the battery from the GROND terminal of the DC adapter. The positive terminal of the battery and DC adapter can be connected to PIN 1 of the DC socket. PIN 1 and PIN 2 provide power to the PCB. PIN 3 is where the GROUND of the battery is connected
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