Why is there always a current sound in the stereo at home, and why is there a lot of current sound i

Hello, there are two possibilities for the sound of electric current in the audio, and there are two possibilities for no sound: first, the sound source is faulty; Second, the power amplifier is faulty.

1.Failure of the sound source. Check the sound source first, for example, the connection cable of the sound source is broken, or it is short-circuited, and try to change the connection cable with a good one.

Or directly use the audio output of the mobile phone (headphone output), use the normal mobile phone headphone output, replace the sound source of the audio, after the normal connection, whether the audio still has current sound, no, on**a mobile phone**, the audio should be normal.

If there is still current sound after normal connection or new connection cable, it proves that it is not a problem with the sound source, but a power amplifier failure.

2.Easy check for amplifier failures. Remove all the sound source connection wires, turn on the power amplifier power, and slowly increase the volume knob, if there is still current sound, it can be sure that the output circuit of the power amplifier is faulty, because, the normal power amplifier output circuit, when there is no signal, the output level is 0 level when balanced.

Once the fault is made, the output circuit is unbalanced, and the output when there is no signal is not 0 level, and there is a large amount of level, and there is a large amount of current sound. That is, the greater the loss, the louder the current.

Imbalance, usually the power amplifier output pair tube is broken, bad one will produce an imbalance, both are broken, there is no sound at all. The output electrode can be tested with a multimeter, with a 5V DC file, the negative meter pen is grounded, and the positive meter pen is connected to the output electrode of the tube, when normal, the meter needle is 0, or there is a slight deviation. When the output tube is out of balance, the gauge hand is not 0 and has a certain voltage value.

At this point, it can be suspected that there is an imbalance in the pipe. If there is a slight imbalance, adjust the static balance resistor, and the balance can generally be restored. When there is a serious imbalance and the adjustment of the static balance resistor is ineffective, it is necessary to consider replacing the right tube.

3.When replacing the alignment tube, it is best to replace the two together. Because, the so-called pair of tubes means that the electrical parameters of the two power amplifier output tubes are strictly consistent.

Therefore, it is impossible to maintain strict consistency in the electrical parameters of the new and old tubes. However, if the electrical parameters are inconsistent, it is not possible to ensure that the 0 level is balanced at the static time, and the static level is unbalanced, and the effect is the current noise.

4.The current noise of a high-quality power amplifier is as small as possible when static (no input signal), indicating that the more consistent the electrical parameters of the tube, the higher the quality of its playback.

First, determine which part of the current sound is generated.

Disconnect the connecting wires that may generate electric current sound in turn.

For example, the input of each sound source, the input of the microphone, etc.

If all of them are disconnected, there is still a current sound, it is a power amplifier failure.

If one of the inputs is present, then it is necessary to check the connection cable of the input, or the sound source is partially faulty.

Summary. The sound of a loud current can be caused by a variety of reasons, and the following are a few common reasons: 1. Power supply problems:

Unstable audio power supply voltage or poor power wiring will lead to current sound. In this case, you can try to replace the power supply or check that the power cord is in good contact. 2. Noise interference:

Electromagnetic fields or radio wave interference in the vicinity of power supplies or audio signal lines can also cause electrical sound. Try rewiring or reorienting the signal and power cables so that they are not close to other electrical equipment or sources of interference. 3. External interference:

Interference from other electrical devices or light sources can also cause the sound of an electric current. Try turning off nearby appliances or blocking out light sources. 4. Equipment damage:

Damage to the amplifier or speaker may also result in the sound of an electric current. You can try to repair the audio equipment.

The sound of the audio has a large current may be caused by a variety of reasons, and the following are several common reasons: 1. Power supply problems: The unstable voltage of the audio power supply or the poor wiring of the power supply will lead to the current sound.

In this case, you can try to replace the power supply or check that the power cord is in good contact. 2. Noise interference: electromagnetic fields or radio wave interference near the power supply or audio signal line may also cause current sound.

Try rewiring or reorienting the signal and power cables to avoid them being close to other electrical equipment or sources of interference. 3. External interference: interference from other electrical equipment or light sources may also cause current sound.

Try turning off nearby appliances or blocking out light sources. 4. Equipment damage: damage to the amplifier or speaker may also lead to current sound.

You can try to repair the audio equipment.

Why is there a very loud noise after my speaker and headphones are connected to the host, it may be the current sound, and the sound card driver is deleted and it is still useless.

If your speaker and headphones have a very loud noise current after connecting to the main unit, there may be some reasons for this: 1. Poor audio cable connection: Poor audio cable connection may also lead to noise.

You can try plugging the audio cable back in or replacing it. 2. Noise interference: The electromagnetic field or radio wave imitation interference near the power supply or audio signal punching line may also cause noise, so avoid them from being close to other electrical equipment or interference sources.

3. You may need to check whether there is a problem with the hardware device of the host.

If the speaker emits a large electrical sound (mostly humming), it needs to be checked and eliminated as follows:

1. As long as the audio power is turned on, there is a loud humming sound, and it is not controlled by the volume potentiometer. This fault is caused by a problem with the power supply circuit. It is recommended to use a multimeter to check the four diodes and filter capacitors in the bridge rectifier after the secondary voltage of the power transformer, whether there is breakdown, open circuit, short circuit, damage, desoldering and other phenomena, and then the filter electrolytic capacitor, whether there is flowing water, expansion, explosion, open circuit, short circuit components, if there is a break, replace the same type of electronic components.

The rectifier diode and filter capacitor circled in red are shown in the picture below

2. The hum of the sound changes with the change of volume, that is, the volume increases, the hum also increases, and the volume decreases and decreases. If the sound source is normal, then, this fault is in the pre-voltage amplification circuit, first check whether the audio line ground terminal contact is intact. Or unplug the audio cable, the speaker continues to hum, it is the circuit board of the power amplifier pre-voltage amplification circuit has a problem, you need to open the audio, check the circuit board, check whether the electronic components in the pre-circuit are blackened (resistance), electrolytic capacitors have running water, expansion, explosion, etc., if there is, you need to find out the reason, you can replace the same type of electronic components, otherwise it will continue to burn after replacement.

Then there is the grounding component, whether there is disconnection, desoldering, poor contact and other phenomena.

3. If you can't get it yourself, it is recommended to ask the master, otherwise you will be prone to other failures.

There are several reasons for this problem, most of them are caused by the poor shielding of the signal line input of the signal source, that is, the shielding wire is not grounded or desoldered, and the grounding of the power amplifier is not good or not grounded, and then there is the reason of the power amplifier itself, such as the power filter capacitor is broken or desoldered or the capacity is smaller, and there is the current sound from the signal source, this reason may be that the signal source is broken, almost on these problems, find out for yourself, if not, find a maintenance personnel to help you see it.

Answer: Hello, we have collected relevant information for you, please check for reference! 1.If the speaker itself fails, you can unplug all the input signal lines and other connecting wires of the speaker, only connect the power cord and speaker wire, if the current sound disappears, it proves that there is no problem with the speaker itself.

If there is, it may be that the speaker itself is malfunctioning or that the strong electromagnetic is dry. 2.For the signal source, you can change other audio sources as the input signal for verification, and if there is a problem, you can change the processing.

3.If the current sound caused by the failure of the speaker itself, it is necessary to find the cause, mostly due to the failure of the power filter capacitor. 4.

The current sound caused by electromagnetic drying, you can add a power filter, which can effectively improve the current sound caused by electromagnetic drying. 5.There is a current sound, some may be a problem with the parts, and the small problems can be solved by themselves, but generally it may be a problem with the parts, and you need to find a professional repairer.

Question: If you turn it on for a long time, there will be current, if you turn it on again after the power is off, there will be no current sound, what is the reason for this?

Answer: Hello, there are many situations that will cause noise in the computer audio, such as the speaker is interfered with, the interface or connection line is not in good contact, and the sound itself is of poor quality. Generally speaking, computer audio is mostly active speakers, and there will be amplifiers inside, so noise is inevitable, and the noise of active speakers can be roughly divided into electromagnetic interference, mechanical noise and thermal noise. If there is a current sound again, you can try it according to the steps I sent me above, and it is not ruled out that it is caused by a bad contact of a certain line.

Most of them are not well grounded or unreasonable.