When placing special components in circuit board planning, the primary consideration is the size of the PCB. When the PCB scale is too large, the printed lines become long, the impedance increases, and the resistance to dryness can only decrease, resulting in increased costs; If it is too small, the heat dissipation is not good, and it is easy to be disturbed near the line. After confirming the dimensions of the PCB, confirm the placement of special components. Layout all components of the circuit based on functional units. The placement of special components should generally follow the following principles during layout:

1. Minimize the connection between high-frequency components as much as possible, and try to reduce their distribution parameters and electromagnetic interference with each other. Components that are easily disturbed should not be too close to each other, and inputs and outputs should be kept as far away as possible.

Some components or wires may have a high potential difference, and their spacing should be increased to avoid accidental short circuits caused by discharge. High voltage components should be kept out of reach by hand as much as possible.

3. Components weighing over 15G can be fixed with brackets and then soldered. Those heavy and hot components should not be placed on the circuit board, but on the bottom board of the main chassis, and heat dissipation should be considered. Thermal sensitive components should be kept away from heat generating components.

4. The layout of adjustable components such as potentiometers, adjustable inductance coils, variable capacitors, and micro switches should consider the structural requirements of the entire switch. For some commonly used switches, if the structure allows, they should be placed in a place that is easily accessible to hands. The layout of components should be balanced, with appropriate density, and not top heavy.

Article source: Jiangmen single-sided and double-sided circuit boardhttp://www.yonghongpcb.com/