The common PCB circuit diagram mainly has the schematic diagram, the block diagram, the assembly drawing and the printing board diagram four big categories, below small edition to say in detail.
1. Schematic diagram
It is also called "electrical schematic diagram". Because it directly reflects the structure and working principle of electronic circuits, it is generally used in the design and analysis of circuits.
When analyzing the circuit, by identifying the symbols of various circuit components on the drawing and the connection mode between them, we can understand the actual working principle of the circuit. The schematic diagram is a tool used to reflect the working principle of the electronic circuit.
2. Block diagram
Block diagram is a kind of circuit diagram which uses box and line to show the working principle and composition of the circuit. Basically speaking, this is also a schematic diagram, but in this kind of drawing, there are almost no other symbols except boxes and lines.
The main difference between it and the above schematic diagram is that the schematic diagram depicts in detail all the components and their connection modes of the circuit, while the block diagram simply divides the circuit into several parts according to its functions, and each part is described as a box, and a simple text description is added in the box.
Use lines (sometimes with arrows) to indicate the relationship between boxes. Therefore, the block diagram can only be used to reflect the general working principle of the circuit, and the schematic diagram can also be used as the basis for collecting components and making circuits.
3. Assembly drawing
It is a kind of drawing used for circuit assembly. The symbols on the drawing are often the outline drawings of the physical circuit components. As long as we follow the picture, we can complete the circuit assembly by connecting some circuit components according to the drawing.
This kind of circuit diagram is generally used by beginners. Assembly drawings vary according to the different assembly templates. Most of the occasions as electronic products use the printed circuit board to be introduced below.
Therefore, printing plate drawing is the main form of assembly drawing. In the beginning of electronic knowledge, in order to be able to contact the electronic technology earlier, we chose the screw hole plate as the basic installation template, so the installation drawing became another mode.
4. Printing board
The full name of printed circuit board drawing is "printed circuit board diagram" or "printed circuit board diagram". It belongs to the same kind of circuit diagram as assembly drawing, and is used for assembling actual circuit.
Printed circuit board is to cover a layer of metal foil on an insulating board, and then corrode the metal foil that is not needed by the circuit. The remaining metal foil is used as the connecting line between circuit components, and then the components in the circuit are installed on the insulating board, and the remaining metal foil on the board is used as the conductive connection between components to complete the circuit connection.
This kind of circuit is also called copper clad laminate. The distribution of components in a printed board diagram is often quite different from that in the schematic diagram.
This is mainly because, in the design of printed circuit board, we mainly consider whether the distribution and connection of all components are reasonable, and consider many factors such as component volume, heat dissipation, anti-interference, anti coupling and so on. From the perspective of appearance, the printed circuit board designed by combining these factors is difficult to be completely consistent with the schematic diagram. In fact, it can better realize the function of the circuit.
With the development of science and technology, the production technology of printed circuit board has been greatly developed; in addition to single panel and double-sided board, there are many panels, which have been widely used in daily life, industrial production, national defense construction, aerospace industry and many other fields.
Among the four types of circuit diagrams introduced above, the electrical schematic diagram is the most commonly used and the most important. If you can understand the schematic diagram, you can basically master the principle of the circuit, draw the block diagram, design the assembly drawing, and print the board diagram, which are relatively easy.
It is also very convenient to master the schematic diagram and carry out the maintenance and design of electrical appliances. Therefore, the key is to master the schematic diagram.
I believe that through the above understanding, we have a deeper understanding of the circuit diagram.