1. Follow the layout principle of “first big, then small, first difficult, then easy”, that is, the layout of important unit circuits and core components should be given priority.

2. The layout shall refer to the principle block diagram and arrange the main components according to the main signal flow pattern of the single board.

3. The arrangement of components should be convenient for debugging and maintenance, that is, large components should not be placed around small components, and there should be enough space around elements and devices to be debugged.

4. For circuits of the same structure, “symmetrical” standard layout should be adopted as far as possible;

5. Optimize the layout according to the standard of uniform distribution, balance of gravity center and beautiful layout;

6. The same type of plug-in components should be placed in one direction in the X or Y direction. The same type of polar-separated components should also strive to be consistent in the X or Y direction for ease of production and inspection.

7. Heating elements should be evenly distributed in general to facilitate the heat dissipation of the single board and the whole machine. Temperature sensitive devices other than temperature detection elements should be kept away from components with high heating.

8. The layout shall meet the following requirements as far as possible: the overall connection line shall be as short as possible, and the key signal line shall be the shortest; High voltage, high current signal and low current, low voltage signal completely separate; Separate analog signals from digital signals; High frequency signal is separated from low frequency signal; High frequency components should be adequately spaced.

9. The layout of the decoupling capacitor shall be as close as possible to the power pin of IC, and the circuit formed between it and the power source and the ground shall be the shortest.

10. In the layout of components, appropriate consideration should be given to placing components with the same power source together as far as possible, so as to separate future power sources.