Double sided PCB through hole drilling technology.

Double sided printed circuit boards are more commonly used than single-sided printed circuit boards because they allow the introduction of more complex circuits. Like single-sided PCBs, they have only one layer of substrate, but both sides are covered with conductive metals and circuit components. Then use through-hole mounting or surface mounting to connect the components.

Each end of the lead is soldered to a precise component or circuit. This can be done manually or through an automatic plug-in installation machine. Through hole mounting continues to be used in circuits that have to withstand more pressure because the combination of leads and soldering through the circuit board creates a stronger connection. Through hole printed circuit boards are commonly used in military and aerospace products.

There is no need to drill holes in the plate for surface mounting. The components are directly mounted on the PCB. This method uses smaller leads or no leads at all. Surface mount printed circuit boards are more popular than through-hole printed circuit boards because their processing and processing costs are much lower. The components can be batch welded or hand welded on the steel plate.