In general, the electronic products we use are all designed by pcb, capacitor, resistor and other electronic components according to the designed circuit diagram, so all kinds of electrical appliances need various smt chip processing technologies to process.
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Basic knowledge of SMT placement: PCB related information:
1943, Americans mostly applied this technology to military radio stations. In 1948, the United States officially recognized that this invention can be used for commercial purposes. Since the mid-1950s, printed circuit boards have been widely used. Printed circuit boards will appear in almost every kind of electronic equipment.
If there are electronic parts in a device, they are all embedded in PCB of different sizes. The main function of PCB is to make various electronic components form predetermined circuit connections and play the role of relay transmission. PCB is the key electronic interconnection of electronic products and is known as "the mother of electronic products".
Baidu encyclopedia -PCB
Baidu encyclopedia -SMT patch