There are many types of circuit boards with different names, which can be named according to materials, layers, inherent characteristics, etc., such as: single-sided, double-sided, multi-layer boards, HDI, allegro, FR4 circuit boards, ceramic circuits board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printing (copper engraving etch technology) circuit boards, etc. The circuit board is a miniaturized and intuitive circuit, which plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances.

If it is manual welding, it is necessary to develop a good habit. First, check the PCB board visually before welding, and use a multimeter to check whether the key circuits (especially the power supply and ground) are short-circuited; Use a multimeter to test whether the power supply and the ground are short-circuited; in addition, do not throw the soldering iron randomly when soldering, if the solder is thrown on the solder pins of the chip (especially the surface mount components), it is not easy to find.