The 2051 chip is a microcontroller chip that can be programmed to adjust the output voltage. First of all, you need to understand the input and output ports of the chip, and set the voltage value of the output port as required. Then the corresponding control statement is written in the program, and the output voltage is adjusted by modifying the value of the register. The specific implementation method can refer to the data manual of the chip or related programming textbooks. It should be noted that the output voltage should be adjusted within the working voltage range of the chip to avoid damage to the chip.
This can not be adjusted by itself, after plugging in the power, the green line and any black short connection, the power supply has a voltage output