Electrical principles and mechanical structure design, determining the size and structural shape of the PCB based on the overall structure of the machine. Draw a process diagram of the SMT printed circuit board, indicating the length, width, and thickness of the PCB, the position and size of structural components and assembly holes, and leaving edge dimensions, so that circuit designers can carry out wiring design within an effective range. The choice of assembly form depends on the type of components in the circuit, the size of the circuit board, and the equipment conditions of the production line.

　　PCB board sampling shares with you the principles for selecting the assembly form of printed boards: following the principles of optimizing processes, reducing costs, and improving product quality, first determine the overall goals of electronic product functions, performance indicators, costs, and overall dimensions of the entire machine. When developing and designing new products, the first step is to position the performance, quality, and cost of the product In general, any product design requires a balance and compromise between performance, manufacturability, and cost. Therefore, when designing, the first step is to position the product's purpose and grade.