PCB , electronic components are provided by the electrical connection . Its development has been 100 years of history ; it is designed primarily layout ; main advantage of using the circuit board is greatly reduced wiring and assembly errors , improve the level of automation and production labor rates. Printed circuit board design is based on the schematics as a blueprint to achieve functional circuit user needs. Printed circuit board layout design mainly refers to the need of internal electronic components, metal wiring , layout of various factors , electromagnetic protection, thermal dissipation, crosstalk , etc. vias and external connections. Excellent circuit design can reduce production costs and achieve good circuit performance and heat dissipation. Simple layout can be achieved by hand , but the complexity of circuit design in general also need the help of computer-aided design (CAD) to achieve, and famous design software OrCAD, Pads ( ie PowerPCB), Altium designer ( ie Protel), FreePCB , CAM350 , such as printed circuit boards, also known as printed circuit boards , printed circuit boards , referred to as PCB, commonly used abbreviation PCB (Printed circuit board) or write PWB (Printed wire board), with insulation board to the substrate, cut into a certain size , which is attached at least one conductive pattern and a hole cloth ( such as component hole , a fastening hole , the hole metallization , etc.) used in place of a conventional device for electronic chassis components , and between the electronic components to achieve connected to each other . Since this electronic printing plate is produced , it is called " printed " circuit board. . Most Motherboard PCB are 4-8 layer structure , but technically theory can be nearly 100 layer PCB board.
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