To understand the working voltage and voltage generation mode of each chip, how to judge the quality of components and how to replace them, it is not necessary to know why such voltage is needed and how to calculate the voltage and current.

The names of circuit boards include: circuit board, PCB board, aluminum substrate, high-frequency board, thick copper plate, impedance board, PCB, ultra-thin circuit board, printed (copper etching technology) circuit board, etc. The circuit board makes the circuit miniaturized and intuitive, which plays an important role in mass production of fixed circuits and optimization of electrical layout. Circuit board can be called printed circuit board or printed circuit board (printed circuit board in English) PCB and flexible Printed Circuit Board)PCB [1] (FPC board is also called flexible printed circuit board flexible printed circuit board), which is a highly reliable and excellent flexible printed circuit board based on polyimide or polyester film. It is characterized by high wiring density, light weight, thin thickness and good flexibility! ) and reechas (Soft-Hard Bonding Board)-The birth and development of ——FPC and PCB gave birth to a new product-Soft-Hard Bonding Board. Therefore, the soft-hard bonding board is a kind of circuit board with FPC characteristics and PCB characteristics, which is formed by combining flexible printed circuit board and rigid circuit board through pressing and other processes according to relevant process requirements.