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　　　　Printed circuit board, also known as printed circuit board, as the carrier of electronic components, the realization of e

　　　　To increase the area that can be wired, multilayer Boards use more single - or double-sided wiring boards. With a double

　　　　Should be to carry out vertical industry alliance, that is, the component procurement, SMT,PCB into a train, so that the

　　　　Control the direction of wiring When wiring PCB, avoid forming the same direction of different signals in adjacent layers

　　　　A single-chip microcomputer is a CPU with timers, program memory, counters, etc. A single single-chip microcomputer is us

　　　　The guide hole alignment method uses the "guide hole" on the PCB to identify the number of layers of the PCB. T