Current sound from power adapter

There may be the following reasons:

1. The poor contact between the adapter power cord and the adapter Jack causes a fire. Replace the cord and clean the small metal post of the adapter Jack.

2. If the magnetic core of the switch transformer in the adapter is loose, do not handle it. If you can't stand it, open it and fill the switch transformer with resin.

The sound produced by current flow interference is relatively loud when some adapters are poorly shielded, which will not affect the use.

3. It is not normal for the current adapter to have friction sound. After all, there is no sound producing device, which may be current sound. It is normal for the computer to have a slight friction sound. After all, it needs to be cooled without stopping. There can be no sound.

The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances. It is widely used in telephone mother machine, game machine, language repeater, Walkman, notebook computer, cellular phone and other equipment.

Power adapter is generally composed of shell, power transformer and rectifier circuit. According to its output type, it can be divided into AC output type and DC output type; According to the connection mode, it can be divided into wall type and desktop type.

Power adapter is widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation and other fields.