When your electronics project requires you to step down a higher-voltage battery or power brick to a specific, lower logic voltage, the LM2596 buck converter is the classic solution. This specific upgraded module takes the highly reliable, 150 kHz high-frequency switching technology of the standard LM2596 board and pairs it with a bright, 3-digit 7-segment LED display. This built-in voltmeter completely eliminates the guesswork from adjusting your voltage, providing real-time readouts right on your printed circuit board.

By simply turning the onboard precision multi-turn potentiometer with a small screwdriver, you can smoothly dial in your exact required output voltage anywhere from 1.25 Volts up to 37 Volts. A convenient tactile push-button next to the display allows you to instantly toggle the screen between showing the incoming voltage and the outgoing voltage, indicated by two small LED status lights. Capable of comfortably delivering a continuous 2 Amps of current, it is an absolute essential component for custom DIY power supplies, battery-powered robotics, and complex automotive electronics.

Key Features & Functional Advantages

• Integrated Digital Voltmeter: Features a bright red, 3-digit LED display that accurately reads voltages from 0 to 40 Volts, saving you the hassle of holding multimeter probes to the board during adjustment.

• Input/Output Toggle Switch: A single push-button allows you to switch the display between monitoring the incoming supply voltage and the regulated output voltage, while a long press turns the display off to save power.

• Voltmeter Calibration: The display features a fine-tuning calibration mode, allowing you to manually adjust the readout to perfectly match a high-precision laboratory multimeter if needed.

• Fully Adjustable Output: The onboard 25-turn precision trimpot gives you absolute, granular control over your output voltage, ensuring your sensitive logic chips receive exactly the power they require.

• Wide Input Range: Readily accepts input voltages from 4.2 Volts all the way up to 40 Volts DC, making it highly compatible with standard 5V USB lines, 12V car batteries, and large 24V industrial power rails.

Perfect For

• Custom Bench Power Supplies: Acting as the variable-voltage core and digital readout for a DIY laboratory power supply for testing electronic components.

• Battery-Powered Projects: Highly efficient power conversion ensures you get the absolute maximum run-time out of your multi-cell lithium or lead-acid batteries while actively monitoring their charge level.

• Automotive Electronics: Dropping a car’s noisy, fluctuating 12-to-14 Volt alternator system down to a clean, steady voltage for custom dashboard displays and sensors.

• Microcontroller Power: Safely stepping down 9-Volt or 12-Volt battery packs to provide a rock-solid, verified 5-Volt rail for Arduino and Raspberry Pi development boards.

Technical Specifications

• Device Type: DC-DC Step-Down (Buck) Switching Converter with Voltmeter

• Main Control Chip: LM2596S

• Input Voltage Range: 4.2 Volts to 40.0 Volts DC

• Adjustable Output Voltage: 1.25 Volts to 37.0 Volts DC

• Maximum Output Current: 2.0 Amps continuous (3.0 Amps maximum with an added heatsink)

• Voltmeter Accuracy: 0.1 Volts

• Switching Frequency: 150 kHz

• Module Dimensions: Approximately 66mm x 36mm x 14mm