An adjustable step up/down power supply module with a 3Bit LED digitaltube display. Display output in real time. Rotate the long handle potentiometer to adjust output voltage. Set output to meet the required. It can be used as an ordinary Buck power supply module. Simple and efficient, practical. Key benefits Real time voltage readout: the 3Bit LED digitaltube display shows the output voltage as you adjust. Precise and easy adjustment: the long handle potentiometer allows smooth, accurate tuning of the output. Flexible voltage control: adjustable step up and step down operation for a wide range of applications. Low power consumption: designed for efficient operation. Buck compatibility: can be used as an ordinary buck power supply module when buck mode is appropriate. Simple and practical design: straightforward to install and use. What it is and how it works The module is an adjustable step up/down power supply with a 3Bit LED digitaltube display that shows output values in real time. Turn the long handle potentiometer to adjust the output voltage to the required level. It serves as a versatile power supply option that can operate in buck mode as needed. Applications and use scenarios Arduino, ESP32, and other microcontroller projects: set a stable, exact supply voltage and monitor it live. Batterypowered devices and portable electronics: adjust voltage to match load requirements and optimize efficiency. Educational labs and demonstrations: observe how changes in the output voltage affect circuits with immediate readout. How to use Rotate the potentiometer to adjust the output voltage; the 3Bit LED display updates in real time. Set the output to the required value for your circuit, then connect the module as the power source. Notes The module is an adjustable step up/down power supply module with 3Bit LED digitaltube display. Display output in real time. Rotate potentiometer to adjust output voltage. Set output to meet the require. It can be used as ordinary Buck power supply module. Simple and efficient, practical.