In the semiconductor electronics industry, if you want to become a qualified electronic, in addition to understanding the basic knowledge, but also know the key points of circuit protection device selection.
The molten solder diffuses along the surface of the welds with the help of capillary suction, forming the infiltration of solder and welds, firmly bonding the components and the printing board, and has good electrical conductivity.
Manual welding is a very practical skill, after understanding the general method, to practice more; More practice, can have better welding quality.
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The design of printed circuit board mainly refers to the layout design, which needs to consider the layout of external connections.
The circuit board inside the line is mainly pure copper, that is, bare copper plate. Some people think that the gold color is copper, which is the protective layer on the copper.
On the automatic plug-in line, if the PCB is not smooth, it will cause inaccurate positioning, and the components cannot be inserted into the holes of the board and the surface mounting pad, and even crash the automatic plug-in machine.
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For integrated circuits, due to the increase in edge speed, if no other measures, the length of the line is greatly shortened to maintain the integrity of the signal.
Transmission delays on ground and interconnect lines in high-speed systems are also factors to be considered in system design.
In mixed-signal PCB design, there are special requirements for power wiring and the isolation of analog and digital noise from each other to avoid noise coupling, thus increasing the complexity of layout and wiring.
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