How to avoid humming sound when KTV audio equipment is connected!Bar use audio Vendor

　　How to avoid humming sound when KTV audio equipment is connected

　　KTV audio equipment will present some problems during the time of the equipment, such as the presentation of communication sounds. What are the reasons for the presentation of communication sounds?

　　1. The ground must be reasonably grounded. Generally, the shell of the audio equipment and the shielding of the power transformer of the device are connected together. The shell of this equipment also has a "ground", which is also different from the other two "grounds". . When the "ground" of the earth is more annoying, the "ground" of the device shell can be connected to it to reduce the annoyance of communication, otherwise, don't connect.

　　2. The power supply of strong signal equipment and the power supply of weak signal equipment should be connected in groups, and the weak signal audio equipment (such as CD, deck,,,,,) should be connected to the same group of power supply, and the strong signal power should be connected to the other group of power supply. It can avoid the disturbance of the power communication noise of the conduction method.

　　3. The external shielded wire of balanced connection is only grounded at one end, or both ends are not grounded, etc. Generally speaking, it is to separate the signal ground wire between two audio equipment with different "ground" potentials, so as to avoid the direct connection of the equipment or the formation of a ground loop.

　　4. There are also some relatively effective methods: when planning a clean power supply, a separate power transformer should be planned; when unconditional, an independent set of power supplies can be used to supply power separately from air conditioners and other equipment; or an isolated power transformer should be selected. .

　　5. Suspended grounding can be used, that is, the potential at this point is the same as the ground, which is zero potential. But this point is not directly connected to the ground. It is the point where the KTV audio equipment circuit has zero potential to ground. There is an impedance between this "ground" and the actual ground, and it is high impedance, so that common mode disturbances can be overcome.

　　6. The direct current circuit connection must not occur between the two audio equipment.

　　7. Different systems share the simplest ground and cause the annoyance of communication noise. Different systems must be connected with a balanced isolation transformer to connect with the TV OB vehicle system; the connection between the system and a large electronic display screen; or the connection with an electronic computer, etc., generally must be connected with a balanced isolation transformer.

　　8. The short-distance transmission signal can be unbalanced and the long-distance transmission signal can use the transmission method of balanced or balanced isolation transformer. The transmission method of using a balanced isolation transformer generally requires a balance transformer at both ends, and one end of the shielding layer is grounded, or it can be left unconnected. Grounding can play a shielding effect, and can also avoid electric shocks caused by equipment leakage. When not grounded, the balance transformer at both ends can provide insulation and edge isolation effect, and the balance transformer is grounded in the middle to discharge static electricity.

　　9. In the case of severe power disturbances, KTV audio equipment should be connected in phases to connect the small signal audio equipment and the power supply of the monitoring equipment. Choose the one phase with the least communication noise of the three-phase power supply, and connect the other two phases. The large signal power amplifier can reduce the annoyance of communication noise from the power supply.

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