PCB printed circuit board according to the number of layers, what series? According to the circuit layer classification: divided into single panel, double panel and multi - layer board. The common multilayer board is generally 4 layers or 6 layers, complex multilayer board can reach dozens of layers. PCB board has the following three main types of division:  

Single-Sided Boards On most basic PCBS, parts are concentrated on one side and wires on the other (with patch components on the same side as wires and add-ons on the other side). Because wires appear on only one side, this type of PCB is called Single-sided. Only early circuits used such boards because a single panel had many severe limitations on the design circuit (because there was only one side, the wiring could not be crossed and had to be routed in a separate path).

Double-Sided Boards have wiring on both sides, but to use wire on both sides, there must be proper circuit connections between them. This "bridge" between circuits is called a pilot hole (via). A pilot hole is a small hole in a PCB filled with or coated with metal that can be connected to wires on both sides. Because the area of the dual panel is twice as large as that of the single panel, the dual panel solves the difficulty of the single panel due to the interleaving of the wiring (can be routed to the other side through the hole), and it is more suitable for the more complex circuit than the single panel.  

To increase the area that can be wired, Multi-Layer Boards use more single or double-sided wiring boards. A printed circuit board with a double-sided inner layer, two single-sided outer layer or two double-sided inner layer, two single-sided outer printed circuit board, through the positioning system and insulating binder materials alternately together and conductive graphics in accordance with the design requirements of the interconnection of the printed circuit board becomes a four-layer, six-layer printed circuit board, also known as the multilayer printed circuit board. The number of layers of the board does not mean that there are several independent wiring layers. In special cases, empty layers will be added to control the thickness of the board. Usually, the number of layers is even and includes the outermost two layers. Most of the main board is 4 to 8 layers of structure, but technically theory can be done close to 100 layers of PCB board. Most large supercomputers use quite a few layers of mainframe boards, but because such machines can be replaced by clusters of ordinary computers, super-multiboards have fallen out of use. Because the layers in the PCB are so tightly integrated, it is not always easy to see the actual number, but if you look closely at the main board, you can see it.

Jiangmen Xinji Circuit Co., Ltd. is a high-tech enterprise specializing in the production of high precision double-sided and multilayer circuit boards.