Capacitors are an indispensable basic component in the electronic circuit. The main function is to store and release charge. The unit of capacitors is Fara (F), and the capacitor uses the medium between the two conductors to prevent the charge from moving, thereby accumulating the actual physical equipment that accumulates the charge. In daily applications, the common form of capacitors is two parallel metal plates with insulating materials in the middle. With the rapid development of digital technology, the applications of capacitors in various consumer electronics products are becoming more and more widely used, such as tablet TVs, laptops and digital cameras.
In the circuit diagram, the capacitor generally uses the letter "C" and the digital logo (for example, C13 represents the 13th capacitor). The capacitance consists of two tight metal membranes and the insulation material in the middle. The characteristic is that the partition DC signal is allowed to pass the communication signal at the same time. The size of the capacitance determines its ability to store electricity. The obstacle of capacitance on the communication signal is called capacitance. It is related to the frequency of the communication signal and the capacitor capacity. The calculation formula is xc = 1/2πfc. In telephone and other devices, common capacitors include electrolytic capacitors, porcelain capacitors, patch capacitors, monopolic capacitors, pyrone capacitors, and polyester capacitors.
The recognition method of capacitance is generally similar to the resistance, including three types: direct standard, color marking and digital standard. There are many types of capacitors, including Fara (F), MF (MF), Microfa (UF), NAF (NF) and Pitter (PF). A large capacitance generally indicates the capacity value directly on the device, such as "10 UF/16V". The capacitance with small capacity is represented by letters or numbers. For example, "1M" in the letters represents 1000 UF, "1p2" represents 1.2PF, "1N" represents 1000PF; "102" in the number representation means 10 × 102pf, which is 1000pf, "224" means 22 × 104pf, 0.22 UF, which is 0.22 UF Essence The capacity error of the capacitor is usually represented by specific symbols, such as F, G, J, K, L, M, etc., corresponding to ± 1%, ± 2%, ± 5%, ± 10%, ± 15%, ± 20%of the tolerance scope. For example, a porcelain capacitor is marked as "104J" indicates that its capacity is 0.1 UF and the error is ± 5%.
From the above introduction, it can be seen that capacitors play a key role in the electronic circuit. Whether in power storage, signal filtering or controlling communication signals, the role of capacitors is irreplaceable. Understanding the basic knowledge of capacitors and correct recognition methods is essential for the design and maintenance of electronic circuits.