1) Single panel: This type of panel is usually used in the case of lower cost requirements. In layout design, sometimes components are needed or jumper wires are used to skip the circuit board's wiring. If there are too many, you should consider using dual panels.

　　2) Dual panel: Dual panel can be used or not to use PTH. Because PTH boards are expensive, they are only used when the complexity and density of the circuit require them.

　　In general, the choice between a single panel or a dual panel must meet the most efficient cost utilization. As a rule of thumb, the cost of a double-sided printed board with plated through holes is 5-10 times that of a single panel. Similarly, the cost of assembling components is also an important aspect to consider, the cost of assembling a single-sided printed circuit board component (manual) is about 25%-50% of the cost of the circuit board, and the cost of assembling a double-sided printed circuit board component with PTH is 15%-30% of its cost.

　　The printed circuit board not only provides mechanical support, but also plays a connection role for the components installed on it. Therefore, for the designer of the printed circuit board, it is necessary to understand the entire physical size of the panel (outer frame size), the location of the mounting holes, height restrictions and related details.