Voltage stabilized power supply is an important part of single chip microcomputer control system, which not only provides multi-channel power supply voltage for measurement and control system, but also directly affects the technical index and anti-interference performance of the system. In recent years, the traditional linear voltage stabilized power supply has been gradually replaced by more efficient switching power supply, especially the rapid popularization and application of single chip microcomputer switching power supply, which has created good conditions for the design of new, efficient and energy-saving power supply. The machine uses a 5 volt power supply and is powered by a dry battery.