What should I do if there is a whistle after the amplifier is installed with a Bluetooth audio recei

This morning, I found that the alarm clock that I usually set only vibrated and did not go off,Open the built-in**is also only from the earpiece above the mobile phone** sound,There is no sound from the lower speaker,Listening to the technicians in the forum said that restoring factory settings has not been solved,I suddenly remembered Huawei's membership service.Manually tested the speaker to determine that it is a problem here, let me go to the local after-sales service center after calling the customer service, and told me that my mobile phone was an electronic voucher after going in the afternoon, and today just after a day can not be replaced, only the speaker can be replaced......

Well, support domestic products! Change!!!

Changed it an hour later and everything worked fine!

It turned out to be a hardware thing!

Just bought a mobile phone of 5,000 oceans for 16 days!

Support domestic products! I'm proud!!

Audio receiver, and how to plug in the cable in the previous diagram to see.

It may be that the line is short-circuited.

Change to a better stereo.

Instead of worrying about the future, work on the present. On the way forward, only through struggle can there be hope for success. Don't easily pin your dreams on others, don't care too much about the whispers of others around you, and don't waste time explaining to others.

When your wallet is full of money that you have worked hard to earn, you will suddenly realize that you have time to suffer from gains and losses, where to guess and guess, and where to figure out others. If you are in full bloom, butterflies will come, and if you want to be an eagle, don't care what the sparrows think of you!

Circuit design problems, if you can, send me the drawings to see, Bluetooth frequency is high if not good, there will be a whistle, can only be reduced to the most ideal state, we are now making a lot of audio are received with Bluetooth,

If you don't connect to Bluetooth, there is a current sound, it is a power filter problem, add a 470uf capacitor (if there is no 100-1000uf basic) and a capacitor (104 ceramic capacitor) in the power supply.

If there is no current sound when Bluetooth is not connected, and there is current sound after connecting Bluetooth, this is due to poor grounding of the Bluetooth antenna. From the antenna to the ground pin, the lead wire can be connected to the amplifier shell.

The current sound changes with the volume of the host It should belong to the problem of the pre-amp Try it 1, change the position of the high to low Because the high to low is behind the original car CD It is possible to receive interference from the electrical equipment in the instrument panel However, the high and low workmanship of Carlisle is not bad Generally, there is rarely a problem of interference There is also to see if there is a condition to change a high to low try.

2. Audio cable: If possible, change the position of the audio cable to see if the audio cable has passed through some equipment that may be the source of interference, such as the comfort module of the vehicle and other computer modules, and to see the quality of the audio cable, if the quality is not good, it is best to replace the audio cable with better quality.

3. Power amplifier grounding See if the power amplifier is grounded well Change the power amplifier grounding point to try that the wire should be interfered with, take the insulated tin foil to wrap the line again.

At present, the sound quality of Bluetooth products is poor, and it is recommended not to use Bluetooth.

It shows that your Bluetooth receiver output noise is large, and you should find a way to improve or replace it.

The current sound changes with the volume of the host It should belong to the problem of the pre-amp Try it 1, change the position of the high to low Because the high to low is behind the original car CD It is possible to receive interference from the electrical equipment in the instrument panel However, the high and low workmanship of Carlisle is not bad Generally, there is rarely a problem of interference There is also to see if there is a condition to change a high to low try.

2. Audio cable: If possible, change the position of the audio cable to see if the audio cable has passed through some equipment that may be the source of interference, such as the comfort module of the vehicle and other computer modules, and to see the quality of the audio cable, if the quality is not good, it is best to replace the audio cable with better quality.

3. Power amplifier grounding See if the power amplifier is grounded well Change the power amplifier grounding point to try that the wire should be interfered with, take the insulated tin foil to wrap the line again.

Copy this sentence plus a casual **, 100% naïve, I want to delete this sentence. In the process of shopping, many of us don't know what Want Want is. When we need to return or exchange goods, we need Want Want number, so how do we check it?

Let's take a look. If you want to see your own Want Want number, then Want Want is the ** member name. If you have forgotten your member name, then go to "My**" and below your avatar is your member name.