Global HS code classification standards

List of this article:

• 1, The amplifier has been modified, and the models of the four amplifier tubes are different. It should be the amplifier pair tube. How to restore it?
• 2 、 Is China Automobile Audiovisual Network a website specializing in car audio modification?
• 3, How to check the brand of car central control screen?
• 4, Which brand of car navigation is good

The amplifier has been modified, and the models of the four amplifier tubes are different. It should be the amplifier pair tube. How to restore it?

If it is an amplifier. That should be the right manager. The model is different. But I know one of the models on the other side. The other one can also be found.

The parameters of the amplifier tube as a pair should be as consistent as possible, not absolutely consistent (that is the theoretical value). In fact, in the sound system, some of the distortions caused by the inconsistency of the tube parameters can be measured but not heard. As long as it does not exceed this bottom line, it can be used. Some manufacturers even use it to fine-tune some components on the circuit.

The current OCL amplifier circuits all adopt a fully complementary push-pull working method. One NPN and one PNP amplifier tube each (or more in parallel) will be installed in one channel. If oneThe channel is all 2SC5200, and the other channel is all 2SA1943, so it can be concluded that it is a faulty machine that has been dismantled and repaired by the tripod cat master.

Add power tube, condition 1: The transformer power is small, and it is also ineffective. 2: Whether the power of the propusive tube is large enough. 3: Even if the above conditions are met, the area of the heat sink is small, and the temperature rise is too high under high power conditions, causing hidden dangers.

You can try it with 8050 or 8550. One NPN type and one PNP type, you have to try it yourself.

Is China Automobile Audiovisual Network a website specializing in car audio modification?

1. China Automobile Audiovisual Network (hereinafter referred to as CarCAV), since its establishment, has always adhered to the concept of "authority, responsibility and guidance". From a simple technical personnel exchange forum at the beginning of its establishment, it has gradually grown into the leading automobile audio-visual comprehensive portal in China and even the world, and leading automobile Audio professional promotion agency.

2. You are asking what is the auto audio-visual network, right? The auto audio-visual network is EMMA auto audio-visual network established in 2010. It is a professional automotive audio-visual portal under the EMMA-China.

3. China Automobile Audiovisual Network focuses on the automotive aftermarket (including automotive audio, automotive soundproofing, automotive beauty, automotive interior decoration and other projects) and provides netizens with the latest, most complete and timely information about the automotive aftermarket.

4. China Automobile Audiovisual Network ( ), the latest deceptive industry website, can publish anything as long as you pay. A while ago, the website was also hacked several times, that is, everyone is dissatisfied with their deceptive propaganda.

5. If you need a specific audio modification plan, you can go to Baidu "China Automobile Audio-visual Network". The car audio modification sub-section provides netizens with a large number of car audio modification cases every day, including car audio modification common sense, car audio modification detailed process and other types of content. You can post and ask questions. There will be many industries Professionals answer you and give you a perfect one.

How to check the brand of car central control screen?

1. CASKA/CASKA brand, founded in 1998, belongs to Guangdong Good Helper Electronic Technology Co., Ltd., which is not only a special product for China's aerospace, but also a national key high-tech enterprise.

2. Hello, this will be more or less difficult. First of all, check whether the gap is uniform and whether there are any traces of prying through the corners of the appearance. Secondly, confirm whether the map inside is Kailid's.If it's some Kailid, it's basically all disguised.

3. If you want to check the brand of the vehicle's central control screen, you need to disassemble the central control screen, and then there is a nameplate behind the central control screen and the configuration information of the central control screen.

4. There are brands such as Feige, Luchang and Desai Xiwei on the car central control screen.

5. Brand classification of car central control display Judging from the existing market, the currently popular car control system central control display brands mainly include BMW's iDrive, Mercedes-Benz's COMAND, Lexus' Remote Touch, Audi's MMI, Volkswagen's M IB and so on.

6. Xia Ang. According to the official website of Volkswagen, the central control of the original Jetta vs5The screen brand model is Xiaon, which is applicable to Volkswagen Jetta VS5/VS7 in 2019, 20, 2021, and adopts the octa-core 4G version 8+256G. Jetta VS5 is a compact SUV under FAW-Volkswagen Jetta.

Which brand of car navigation is good

At present, it is best to use the most accurate navigation software including Gaode Map, Baidu Map, Tencent Map, etc. These navigation softwares have high accuracy and reliability, can provide real-time road condition information, traffic prompts, weather forecast and other functions, and also have the characteristics of voice navigation and multilingual support.

Feige Guangzhou Feige Automobile Speaker Co., Ltd. is a famous brand in the field of automobile modification in China. It is specifically engaged in cars.It is a high-tech enterprise that can provide automotive electronic solutions for the automotive industry.

The top ten rankings of car central control large screens are CASKA FlyAudio Huayang ADAYOAlpine Alpine Svauto is a well-known vehicle with more than 190 4S groups and hundreds of channel suppliers across the country. The navigation audio-visual brand focuses on the car entertainment system car navigation system car.

Feige: The navigation is very beautiful, the sound quality is also very good, the response speed is good, it is very smooth and does not jam, and the UI interface design is reasonable and beautiful. I am very satisfied. The quality of the navigation all-in-one machine is very good. I feel that the power is very sufficient. The reversing camera positioning is accurate and the pixels are high. I recommend buying it.

[Pacific Automobile Network] Navigator Brand: It is recommended to choose Feige, Newman, etc. Generally, the better brands include Casda, Feige, Ouhua, Luts, Conqueror, Desai Xiwei, Jingbang, Newman, Covi and so on. They are all matched with Kailid, Daodaotong, Gaode and other navigation software.

: There are several brands of car DVD navigation all-in-one machines with good quality. There are Fei Ge, Luther, Rongfei and Tianzhiyan. As for which brand is good, you have to choose according to the car model. Because each brand focuses on different models.