Classification according to the number of circuit layers: Divided into single panel, double panel multilayer board. Common multi-layer boards are generally 4-layer boards 6-layer boards, complex multi-layer boards can reach dozens of layers.

There are three main types of PCB boards:

Single-Sided Boards On the most basic PCB, the parts are concentrated on one side, the wires are concentrated on the other side (when there is a patch component, it is the same side as the wire, the plug-in device is on the other side). Because the wires only appear on one side, this type of PCB is called Single-sided. Because the single panel has many strict restrictions on the design circuit (because there is only one side, the wiring cannot cross must go around its own path), only early circuits used this type of board.

Double-Sided Boards This type of circuit board has wiring on both sides, but to use the wires on both sides, you must have a proper circuit connection between the two sides. This "bridge" between circuits is called a via. A via is a small hole filled coated with metal on the PCB. It can be connected to the wires on both sides. Because the area of the double-sided board is twice as large as the single-sided board, the double-sided board solves the difficulty of wiring interleaving in the single-sided board (which can be conducted to the other side through the hole), it is more suitable for more complicated circuits than the single-sided board.

Multi-Layer Boards To increase the area that can be routed, multi-layer boards use more single- double-sided wiring boards. A printed circuit board with one double side as the inner layer, two single sides as the outer layer, two double sides as the inner layer, two single sides as the outer layer. The conductive pattern is alternately connected together through a positioning system an insulating bonding material. The printed circuit boards that are interconnected according to design requirements become four-layer six-layer printed circuit boards, also known as multilayer printed circuit boards. The number of layers of the board does mean that there are several independent wiring layers. In special cases, an empty layer is added to control the thickness of the board. Usually, the number of layers is even, it includes the two outermost layers. Most motherboards have a structure of 4 to 8 layers, but technically it can achieve nearly 100 layers of PCB boards. Large supercomputers mostly use fairly multilayer motherboards. However, because such computers can already be replaced by clusters of many ordinary computers, ultra-multilayer boards have gradually become unused. Because the layers in the PCB are tightly coupled, it is generally easy to see the actual number, but if you look closely at the motherboard, you can still see it. Double-sided multilayer circuit board

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