Commonly used devices for PCB boards of electronic component assemblies

PCB: The support body of electronic components.

Hello, theoretically speaking, the schematic diagram can be corresponded to by the components on the PCB board, but the specific difficulty mainly depends on the type of components, the number of components, the layout of the PCB board and other factors. If there are fewer components, the number is small, and the circuit is relatively simple, then by observing the position, pins and solder joints of each component on the PCB board, you can try to draw the corresponding schematic diagram manually, but you need to have a certain understanding of the basic knowledge of components and circuit principles. For PCB boards with complex circuits, in order to avoid misunderstandings and misunderstandings, it is best to combine the relevant information of the PCB board (such as schematic diagrams, layout drawings, descriptions, BOM tables, etc.), and then comprehensively compare and analyze the company.

In addition, there are many automated circuit analysis software on the market that automatically generate the corresponding schematic diagram by scanning the PCB board. This method can more quickly and accurately realize the transfer between the PCB board and the schematic. In general, theoretically, the schematic diagram can be corresponded to by the components on the PCB board, but it requires certain knowledge and ability, and for the PCB board with complex circuits, it is best to combine it with other methods for analysis.

Reading guide: Electronic components are small parts that make up electronic components, machines and other equipment, it is composed of many different small parts, which can be used in various electrical appliances and instruments. Electronic components include resistors, capacitors, potentiometers, etc., which represent the development history of electronic products.

First, the development of commonly used electronic components

The development of electronic components is very rapid, in many fields have applications, the first generation of electronic components is the tube, the tube is very convenient to carry, the appearance is very exquisite, the power consumption is very small, the life of the can be used is very long, it once caused a sensation in the market. After the electron tube, there is an integrated circuit, which is composed of multiple transistors, and the emergence of this product has made electronic products enter the miniaturization. After integrated circuits, large-scale integrated circuits and ultra-large-scale integrated circuits appeared one after another.

Since then, electronic products have entered the development direction of low consumption and high precision.

2. Composition of commonly used electronic components:

1.Resistance: The unit of resistance is ohm, expressed by the letter r, and the marking method of resistance has three types: direct standard method, color ring mark and number mark method, of which the number mark method is mainly used in some small volume circuits, such as patch, and the marking method of color ring mark is widely used, such as four-color ring resistance and so on.

2.Capacitance: The letter C is the symbol of capacitance, and the capacitance is composed of two metal films close to each other, and in the middle of the two metal films are insulating materials, which separate the metal films.

The characteristic of the capacitor is that it is through the straight and straight, and the size of the capacitor is the amount of electrical energy it stores, and when the capacitor obstructs the AC signal, the resulting effect is called capacitive reactance.

3.Inductance: The letter of inductance is L, the inductance coil is composed of insulated wires and insulating brackets, the device is an insulated coil, only DC can pass through the inductance coil, the inductance is marked by two methods: direct label method and color mark method, and the unit of inductance is Heng.

3. Characteristics of commonly used electronic components: bending macro

1.Characteristics of resistor: resistor R has the function of blocking current and voltage division.

2.Characteristics of capacitance: Capacitor C can be filtered.

3.Characteristics of diodes: Diodes have the role of unidirectional conductors.

4.Embedding characteristics of light-emitting diodes: The on-point of light-emitting diodes can emit light.

5.Characteristics of triode: Triode can be used as a switch and amplifier for some electronic devices.

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Common electronic components include resistors, capacitors, crystal diodes, transformers, sensors, transistors, etc.

1. Resistors.

It is a current-limiting element. The resistance has a hindrance effect on the current, it can limit the current through the branch it is connected to, and the current can be adjusted by the resistance of the resistor, so as to ensure that the various components in the electronic equipment work stably under the rated current.

2. Capacitors.

It is a device that holds an electric charge. Capacitors are one of the electronic components widely used in electronic equipment, and are widely used in circuits in the field of DC blocking, bypass, filtering, tuning loop, buried energy conversion, control and other applications.

3. Crystal diode.

Semiconductor terminal devices in solid-state electronics. The main feature of these devices is their nonlinear current-voltage characteristics. Since then, with the development of semiconductor materials and process technology, a variety of crystal diodes with various structures and different functions have been developed by using different semiconductor materials, doping distributions and geometric structures.

4. Transformer.

The working principle is a device that uses the principle of electromagnetic induction to change the alternating voltage, which plays the role of raising and lowering the voltage in electrical equipment, and also has the functions of matching impedance and safety isolation.

5. a sensor.

It is a kind of detection device, which can feel the measured information, and can transform the felt information into electrical signals or other required forms of information output according to the law, so as to meet the requirements of information transmission, processing, storage, display, recording and limb control.

6. Transistor transistor.

It is a semiconductor device that controls the current current, and the bending pin amplifies the current current. Its function is to amplify a weak signal into an electrical signal with a large amplitude value, and it is also used as a contactless switch to control various electronic circuits.