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Sources of power noise of audio equipment system

The indicators of audio equipment are inferior. The preamplifier, tuner, equalizer, etc. have the greatest impact on the system's hum. Some equipment (including imported equipment) has low cost and hi

2021-11-23

The specific source of power supply noise

1. The indicators of audio equipment are inferior. The preamplifier, tuner, equalizer, etc. have the greatest impact on the system's hum. Some equipment (including imported equipment) has low cost and high noise.

2. Leakage of audio equipment. If a certain link in the system leaks, the leakage current will enter the system through the signal ground wire or the chassis ground wire, forming a hum. This kind of situation cannot be found with direct retreat. You must unplug the power cord of the suspect device to confirm.

3. Introduce hum from the coaxial cable of the AV link. Because most of the audio equipment systems used in homes are audio and video synchronized. All coaxial cables that are too long may introduce hum. This is because the shielding layer of the coaxial cable is caused by non-magnetic materials, which is ineffective in shielding low-frequency electromagnetic fields, and it is difficult to avoid sharing the coaxial cable and the audio system in the AV equipment. land.

4. Power supply noise is introduced by the power supply system. When lighting switching equipment and dimming equipment with a large capacity are in operation, the power supply will emit large fluctuations and cause interference, and the power harmonics generated by the thyristor will also cause interference.

5. The power supply noise is introduced by the wiring of the lighting system. When the large-capacity lighting wiring is close to the audio signal line, it will also cause power noise.

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