The printed circuit board is an indispensable part of the electronic equipment in the age of science and technology. The appearance of the printed circuit board makes many functions of electronic products and makes the circuit integration possible. It is mainly composed of welding pad, through hole, installation hole, wire, components, connectors, filling, electrical boundary, etc.
The main functions of each component are as follows:
Pad: The metal holes in the pins of the component are soldered
Through holes: there are metal through holes and non-metal through holes, wherein the metal through holes are used to connect the pins of components between each layer.
Mounting hole: Fix the circuit board.
Conductor: Copper film used to connect the pins of the component to the electrical network.
Connector: The component that connects the circuit boards.
Filling: the copper coating of the ground wire network can effectively reduce the impedance.
Electrical Boundary: Determine the size of the circuit board. All components on the circuit board must not exceed this boundary.
Classification of circuit boards:
The circuit board is divided into three categories: single panel, double panel, and multi-layer circuit board. A single panel, on the most basic PCB, has the parts concentrated on one side and the wires on the other. Because conductors only appear on one side, this PCB is called a single-sided circuit board. A dual panel is an extension of a single panel and may be used when a single layer of wiring is not sufficient for the needs of electronic products. Both sides have copper cladding wires and can be used to conduct the wires between the two layers through the holes to form the desired network connection. Multilayer board refers to a printed board with three or more layers of conductive graphics and insulating materials in between laminated, and the conductive graphics are interconnected according to requirements. Multilayer circuit board is the electronic information technology to high speed, multi-function, large capacity, small volume, thin, lightweight direction of the product.
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