Brown is the positive electrode and black is the negative electrode. Or the center of the socket is positive and the edge of the socket is negative.

Second, the typical connection of DC low-voltage power plug

The typical connection of DC low-voltage power plug is that the outer sheath is grounded and the inner core is connected to the power input. As for the terminal anode and cathode! This is determined by the circuit of this equipment. At present, most circuits are the main circuits of NPN polar components! This circuit is grounded by the negative pole of the power supply, so the DC interfaces of these electrical equipment are grounded by the negative pole, so the sheath of the power plug should be connected with the negative pole of the power supply! The inner core is connected with the anode.

Third, the application of DC socket

1. Audio and video products: MP3, MP4, DVD. Audio;

2. Digital products: digital cameras, digital video cameras, etc.

3. Remote control: remote control of vehicles, rolling doors and household anti-theft products;

4. Communication products: mobile phones, car phones, telephones, construction equipment, PDA, etc.

5. Household appliances: TV sets, microwave ovens, rice cookers, electric fans, electronic weighing scale, electronic fat scales, electronic kitchen scales, etc.

6. Safety products: visual walkie-talkies, monitors, etc. ;

7. Toys: electronic toys, etc.

8. Computer products: cameras, tape recorders, etc.

9. Fitness equipment: treadmill, massage chair, etc.

10. Medical equipment: sphygmomanometer, thermometer, hospital call system, etc.