Double-layer printed circuit board that is more suitable for complex circuits than single-layer boards
A printed circuit board is a conductive pattern attached to the surface of an insulating substrate for connecting electronic devices.
A printed circuit board having conductive patterns on both sides of the insulating substrate is called a double layer PCB. The double-layer PCB has wiring on both sides. The double-layer PCB is usually made of epoxy paperboard or glass cloth. Since the double layer PCB has conductive patterns on both sides, the via holes are generally used to connect the conductive patterns on both sides. A via is a small hole filled or coated with metal on a PCB that can be connected to the wires on both sides. Because the double layer PCB is twice as large as a single-layer printed circuit board, and the wiring can be interlaced (can be wound around the other side), the double layer PCB is suitable for use on circuits that are more complex than single-panel.
The thickness of the double layer PCB is generally 1.6mm, the line width/line distance is 0.8mm/0.3mm, the aperture is 0.6mm, and the thickness of the copper foil is 1oz, that is, the weight of 1oZ is uniformly flattened by the thickness of 1 square foot. It is the weight of the unit area to represent the average thickness of the copper foil.