Friends who are familiar with electronics all know that domestic components are not only of good quality, but also of many kinds, and these components play a very important role in all kinds of electrical equipment. therefore, enterprises that produce electronic equipment will purchase components from domestic components manufacturers with good quality and good after-sales service. So common components are. 
1. Capacitance. 
Capacitance is a very common kind of domestic components, which is composed of two metal films close together and separated by insulating materials. According to the manufacturer of domestic components, the main characteristic of capacitor is DC AC. The capacity of capacitance represents the amount of electric energy that can be stored. The blocking effect of capacitance on AC signal is called capacitance reactance, which is related to the frequency and capacitance of AC signal. 

2. Inductance. 
The inductor is also a kind of domestic component commonly used in the circuit. The characteristic of the inductor is DC resistance AC. The higher the frequency, the greater the impedance of the inductor coil. If suitable for use, the inductor can form an oscillating circuit together with the capacitor in the circuit.In general, inductors have direct standard method and color standard method, in which the color standard method is similar to the resistance. 

3. Crystal diode. 
Another very common type of domestic components is crystal diodes. Crystal diodes often use "D" plus numbers to indicate that under the action of forward voltage, the on-resistance of the diode will be very small, but under the action of reverse voltage, the on-resistance will become extremely large or infinite.Because of this characteristic, diodes are often used in rectifier, isolation, voltage stabilization, polarity protection, coding control, FM modulation and noise suppression circuits.