Double sided boards have wiring on both sides of the circuit board, but to use wires on both sides, you must have appropriate circuit connections between the two sides. This "bridge" between circuits is called a via. The guide hole is a small hole filled or coated with metal on the PCB, which can be connected with the wires on both sides. Because the area of double-sided board is twice as large as that of single panel, double panel solves the difficulty of staggered wiring in single panel (it can be connected to the other side through holes), and it is more suitable for more complex circuits than single panel.
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