The names of circuit boards are: circuit boards, PCB boards, aluminum substrates, high frequency boards, PCB, ultra-thin circuit boards, ultra-thin circuit boards, printed circuit boards (copper etching technology, etc.). The circuit board makes the circuit miniaturized and intuitive, and plays an important role in the batch production of fixed circuits and the layout optimization of electrical appliances.
        Double sided tin plate / sunk plate production process:

        Open material------Drill hole-----Copper sinking----Line---Graph electricity----Etching-----Resistance welding---Character----Spray tin (or sink gold)-Gongs—V cut (some boards do not need).-----Flying test----Vacuum packing