Four major points of PCB circuit diagram

1. Schematic diagram, also known as "electrical schematic."

This kind of map, because it directly reflects the structure and working principle of the electronic circuit, it is generally used in designing and analyzing circuits. When analyzing a circuit, by recognizing the symbols of the various circuit components drawn on the drawings and the connections between them, the principle of the actual operation of the circuit can be understood. The schematic is a tool for embodying the working principle of the electronic circuit. .

2. Block diagram. 

A block diagram is a circuit diagram that shows the operation of the circuit and the outline of the circuit using blocks and lines. Basically, this is also a schematic, but in this drawing, there are almost no other symbols besides boxes and lines. Its main difference from the above schematic diagram is that the circuit diagram details all the components of the circuit and how they are connected, and the block diagram simply divides the circuit into several parts according to the function, describing each part. In a box, a simple text description is added to the box, and the connections between the boxes are illustrated in the boxes (sometimes with arrows). Therefore, the block diagram can only be used to show the general working principle of the circuit. In addition to the principle of the circuit, the schematic can also be used as a basis for collecting components and making circuits.

3. Assembly drawings. 

It is a kind of drawing that is used for circuit assembly. The symbols on the drawing are often the physical outline drawing of circuit components. We can complete the assembly of the circuit by simply connecting the circuit components according to the way they are drawn on the diagram. This circuit diagram is generally used by beginners. The assembly drawing differs according to the assembly template. Most of the applications for electronic products are printed circuit boards described below. Therefore, the printed board drawing is the main form of the 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 mounting template, so the installation drawing becomes another mode.

4. Printing plate map. 

The full name of the printed circuit board is "printed circuit board diagram" or "printed circuit board diagram". It is actually the same type of circuit diagram as the assembly diagram, and is used for assembly of the actual circuit. The printed circuit board is first covered with a layer of metal foil on an insulating board, and then the unnecessary metal foil is etched away. The remaining part of the metal foil is used as the connecting line between the circuit components, and then the element in the circuit is The device is mounted on this insulating board and the remaining metal foil on the board is used as the conductive connection between the components to complete the circuit connection. Since the metal on one side or both sides of this circuit board is copper, the printed circuit board is also called “CLCL”. The layout of printed circuit board components is often very different from the schematic. This is mainly because, in the design of the printed circuit board, it is mainly considered whether the distribution and connection of all the components are reasonable. It is necessary to consider factors such as component volume, heat dissipation, anti-interference, anti-coupling, and the like, and a printed circuit board designed by combining these factors. From the outside, it is difficult to be completely consistent with the schematic; in reality, it can better realize the function of the circuit. With the development of science and technology, the production technology of printed circuit boards has now been greatly developed; in addition to single-panel and double-panel, there are many panels, which have been widely used in daily life, industrial production, national defense construction, aerospace industry, and many others. field. In the four types of circuit diagrams introduced above, the electrical schematic is the most common and most important, able to understand the schematic diagram, it also has a basic grasp of the principle of the circuit, drawing block diagram, design assembly diagrams, plate maps are all compared Easy. It is also very convenient to master the schematics and carry out maintenance and design of electrical appliances. Therefore, the key is to master the schematic.