Circuit boards are divided into three major categories: single-sided, double-sided, and multi-layer circuit boards according to the number of layers.
The first is single-sided. On the most basic PCB, the parts are concentrated on one side and the wires are concentrated on the other side. Because the wires only appear on one side, this kind of PCB is called a single-sided circuit board. Single panel is usually simple to make and low cost, but the disadvantage is that it cannot be applied to too complicated products.
Double-sided is an extension of single-sided. When single-layer wiring cannot meet the needs of electronic products, double-sided is used. Both sides have copper cladding and traces, and the lines between the two layers can be conducted through vias to form the required network connections.
A multi-layer board refers to a printed board with more than three conductive pattern layers and insulating materials in between, and the conductive patterns are interconnected as required. Multilayer circuit board is the product of the development of electronic information technology in the direction of high speed, multi-function, large capacity, small volume, thinning and light weight.
Circuit boards are divided into flexible boards (FPC), rigid boards (PCB), and rigid-flex boards (FPCB) according to their characteristics.
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