Overview
I. Components: The factory is processing a product that does not change the molecular composition. The product can be called a component, and does not require an energy device. It includes: resistors, capacitors, inductors. (Also known as passive components PassiveComponents)
(1) Circuit type devices: diodes, resistors, etc.
(2) Connection devices: connectors, sockets, connecting cables, printed circuit boards (PCBs)
Second, the device: the device that changes the molecular structure during production and processing is called device
The device is divided into:
1. Active device, its main features are: (1) its own power consumption (2) also requires external power.
2, discrete devices, divided into (1) bipolar transistor triode (2) field effect transistor (3) thyristor (4) semiconductor resistors and capacitors
resistance
The resistance is represented by "R" plus a number in the circuit. For example, R1 represents a resistor numbered 1. The main functions of the resistor in the circuit are: shunt, current limit, voltage division, offset, etc.
capacitance
The electronic components are generally represented by "C" plus a number in the circuit (for example, C13 denotes a capacitor numbered 13). The capacitor is composed of two metal films abutting and separated by an insulating material. The characteristics of the capacitor are mainly It is separated by DC communication.
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.
Crystal diode
The crystal diode is usually represented by a "D" plus a number in the circuit, such as: D5 represents a diode numbered 5.
Function: The main characteristic of the diode is unidirectional conductivity, that is, the on-resistance is small under the action of the forward voltage; and the on-resistance is extremely large or infinite under the action of the reverse voltage.
Because the diode has the above characteristics, it is often used in cordless telephones in circuits such as rectification, isolation, voltage regulation, polarity protection, code control, frequency modulation and squelch.
Body diodes can be divided into: rectifier diodes (such as 1N4004), isolation diodes (such as 1N4148), Schottky diodes (such as BAT85), LEDs, Zener diodes, etc.
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