Basic knowledge of electronic components Part II
1. The capacitor is generally represented by a "C" plus a number in the circuit (for example, C13 represents a capacitor numbered 13). The capacitor is an element consisting of two metal films abutting and separated by an insulating material. The characteristics of the capacitor are mainly DC-blocking AC.
The size of the capacitor capacity is the size of the energy that can be stored. The blocking effect of the capacitor on the AC signal is called capacitive reactance, which is related to the frequency and capacitance of the AC signal.
Capacitive reactance XC=1/2πf c (f indicates the frequency of the AC signal, C indicates the capacitance). The types of capacitors commonly used in telephones are electrolytic capacitors, ceramic capacitors, chip capacitors, monolithic capacitors, tantalum capacitors, and polyester capacitors. .
2. Identification method: The identification method of the capacitance is basically the same as the identification method of the resistance, and there are three types: the direct label method, the color scale method and the number standard method. The basic unit of the capacitor is used to pull (F), other units
Also: millifarad (mF), microfarad (uF), nanofarad (nF), picofarad (pF). Where: 1 Farad = 103 millifarads = 106 microfarads = 109 nanofarads = 1012 picofarads
The capacity of a large capacity capacitor is directly indicated on the capacitor, such as 10 uF/16V.
Capacitance values of small capacitances are represented by letters or numbers on the capacitors.
Letter notation: 1m=1000 uF 1P2=1.2PF 1n=1000PF