1, according to the structure of three categories: fixed capacitors, variable capacitors and fine tuning capacitors. Classified by electrolyte: organic dielectric capacitors, inorganic dielectric capacitors, electrolytic capacitors, electric capacitors and air dielectric capacitors. According to the use of: high frequency bypass, low frequency bypass, filtering, tuning, high frequency coupling, low frequency coupling, small capacitor.
2, according to the structure of the capacitor classification according to the structure of the capacitor can be divided into fixed capacitors, variable capacitors and fine tuning capacitors. According to the principle of capacitor classification according to the principle of capacitor can be divided into non-polar variable capacitorsNon-polar fixed capacitors, polar capacitors, etc. Variable capacitors are divided into fine tuning capacitors and single and double capacitors.
3, according to electrolyte classification: organic dielectric capacitors, inorganic dielectric capacitors, electrolytic capacitors, electric capacitors and air dielectric capacitors. According to the use of: high frequency bypass, low frequency bypass, filtering, tuning, high frequency coupling, low frequency coupling, small capacitor. According to the different manufacturing materials can be divided into: ceramic dielectric capacity, polyester capacitor, electrolytic capacitor, tantalum capacitor, and advanced polypropylene capacitor and so on.
4, electrolytic capacitor (CD), large capacity, positiveThe negative pole. Mainly used in power supply circuit, pulse circuit. Mica capacitor (CY), withstand voltage (250v-450v), small capacity, very expensive, large volume. For important parts of the communication machine. There are tantalum capacitors (CA), niobium capacitors (CN), thin film capacitors and so on.
1, this is OK, it is the earliest wireless charging CBB capacitor in the industry, which belongs to the most mature technology. CBThe biggest advantage of B is that it is cheap, and it only costs a few cents.
1, the positive and negative poles of the in-line electrolytic capacitor can be distinguished by the length of the pin and the color of the housing, and the pin length is positive; Short pin is negative; The gray part of the housing with a small area corresponds to a negative pin and the other end is positive. For encapsulation, the positive terminal is generally indicated by marking ""; Or the negative electrode can be represented by a painted area.
2,The capacitor in the circuit board positive and negative electrode distinction methods are: 1, the most reliable way, the multimeter capacitance voltage at both ends, the high voltage side is the positive electrode. 2, observe the capacitor screen printing, the "-" mark is the negative electrode, the "" mark is the negative electrode, they usually only draw one.
3, in-line electrolytic capacitor distinguish positive and negative poles. The positive and negative electrodes of the in-line electrolytic capacitor can be distinguished by the length of the pin and the color of the housing, and the pin length is positive; Short pin is negative; The gray part of the housing with a small area corresponds to a negative pin and the other end is positive. For encapsulation, the positive terminal is generally indicated by marking ""; Or use a coloring zoneThe field represents the negative electrode. Aluminum electrolytic capacitors distinguish between positive and negative electrodes.
4, first of all, let's look at the differentiation method of in-line electrolytic capacitors. Its positive and negative poles can be distinguished by the length of the pin and the color of the housing: the longer end of the pin is positive, and the shorter end is negative; The pin corresponding to the gray area on the housing is the negative pole, and the other end is the positive pole. The package is usually marked with a "" or painted area as an indication. For the chip aluminum electrolytic capacitor, the obtuse part on the base corresponds to the positive electrode, and the straight side part corresponds to the negative electrode.
5, the circle is divided into 2 halves, 1 half is black for negative, half is colorless for positive. The dark shadow on the leftIt's negative, and the right side is positive. The capacitor position on the motherboard, if it is black and white, the black part is negative, and the white part is positive. If it is white or black and colorless, the part that is painted white or black is negative, and the part that is not painted is positive. Under normal circumstances, the range of negative painting part is small.
6, the positive and negative terminals of capacitors are usually distinguished by marks on their appearance. A common mark is a circle at one extreme of the capacitor, which is divided into two halves, one half black and one half colorless. Black represents the negative, colorless represents the positive. On the circuit board, if there are two capacitorsDifferent color markers, usually black or shaded to indicate the negative, white or unshaded to indicate the positive.
1, the unlock recognition function is different non-UD version is the standard version, with 3D face recognition function; The MATE 20 ProUD not only has 3D face recognition, but also has the function of unlocking the screen fingerprint, and the memory size of the two is different in the MATE 20 ProUD versionThe memory size is 8GB, while the memory size of the non-UD version is only 6GB, obviously the UD version is larger.
2, the difference between the two is that the price is different and the unlocking method is different. The PROUD version of Mate20has under-screen fingerprint unlock and face unlock functions, and the ordinary version is rear fingerprint unlock and face unlock. Secondly, in terms of price, the starting price of the ordinary version is 5399 yuan, the starting price of the ud version is 5999 yuan, and the difference between them is 600 yuan, which shows that the ud version is more expensive.
3. The memory of Huawei Mate20pro version is 6GB, which is larger than UDThe version is smaller. Second, from the price point of view, Huawei Mate20proUD version is slightly more expensive. The starting price of Huawei's Mate20pro version will be relatively cheaper, after all, it lacks an important screen unlock function. Third, from the perspective of unlock recognition function, Huawei Mate20pro version uses 3D face recognition, without fingerprint under the screen.
4, Huawei mate20proud version and the ordinary version of the difference in design is no difference, the most important difference between the two is in the phone's system unlock recognition function, Mate20 Pro unlock