1. Capacitors generally use "C" and numbers in the circuit (such as a capacitor with a number 13 in C13). The capacitor is two pieces of gold

　　Components composed of the membrane are tight and are separated by insulating materials in the middle. The characteristics of capacitors are mainly DC communication.

　　The size of the capacitor capacity is to indicate the size of the energy storage. The obstacle of the capacitor to the communication signal is called the capacity of the capacity.

　　The frequency of flow signal is related to electricity capacity.

　　Rong resistance XC = 1/2πf C (f represents the frequency of the communication signal, C represents the capacitor capacity)

　　The types of capacitors commonly used in the telephone are electrolytic capacitors, porcelain capacitors, patch capacitors, monopolic capacitors, 钽 capacitors and polyester capacitors

　　wait. 2. Recognition method: The recognition method of capacitors is basically the same as the recognition method of resistance, and the direct marking method, color marking method and digital standard 3

　　kind. The basic unit of capacitors (F) indicates that other units also include: MF (MF), Micro Method (UF), Nafa

　　(NF), leather (PF).

　　Among them: 1 Fara = 103mm method = 106 micro -method = 109 Na method = 1012 leather method

　　The capacity value of a large capacity is directly indicated on the capacitor, such as 10 UF/16V

　　The capacity value of small capacitance is represented by letters or numbers on the capacitance

　　Alphabet representation: 1m = 1000 UF 1p2 = 1.2pf 1N = 1000pf

　　Number representation: Generally use three digits to represent the capacity. The first two digits indicate effective numbers, and the third digit number is multiplier.

　　Such as: 102 represents 10 × 102pf = 1000pf 224 indicates 22 × 104pf = 0.22 UF3, capacitance error table

　　Symbol F g j K l m

　　Allowing error ± 1% ± 2% ± 5% ± 10% ± 15% ± 20%

　　For example, a porcelain capacitor is 104J indicating that the capacity is 0.1 UF and the error is ± 5%.