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The functions of printed circuit boards in electronic equipment include: providing mechanical support for fixing and assembling for transistors, integrated circuits, resistors, capacitors, inductors and other components.

When we design the PCB board, we also have a set of rules: first, arrange the main component positions according to the signal process, and then follow the “circuit first difficult and then easy, component volume from large to small, strong signal and weak signal separation, high and low. Separate signals, separate analog and digital signals, try to make wiring as short as possible, and make the layout as reasonable as possible”; special attention must be paid to separate “signal ground” and “power ground.

SMT is one of the basic components of electronic components. It is called surface mount technology (or surface mount technology). It is divided into no leads or short leads. It is a circuit assembly that is assembled by reflow soldering or dip soldering. Technology is also the most popular technology and process in the electronic assembly industry.

Different uses. The main raw materials for the production of circuit boards are alkali-free glass cloth, fiber paper, and epoxy resin. Glass fiber board: substrate fiberglass cloth, epoxy board: adhesive is epoxy resin, FR4: substrate cotton fiber paper. All three are fiberglass boards.