LM2596 DC-DC Buck Converter with Voltmeter LED Display – Adjustable Step-Down Power Module 4–40V to 1.25–37V

A versatile LM2596 DC-DC buck (step-down) converter with a built-in voltmeter display for real-time voltage monitoring. This module efficiently converts higher input voltages into stable, adjustable lower outputs, making it ideal for powering electronics and DIY projects.

With a wide input range and high efficiency, it is perfect for Arduino, ESP32, battery systems, and general-purpose power regulation.

Key features

• Step-down (buck) converter – reduces voltage efficiently
• Integrated LED voltmeter display
• Adjustable output voltage via onboard potentiometer
• Wide input range: 4V – 40V
• Output range from ~1.25V to 37V
• Up to 3A output current (with proper cooling)
• High efficiency (up to ~92%)

How to use

1. Connect input power to IN+ and IN-
2. Measure output on OUT+ and OUT-
3. Adjust the potentiometer until the desired voltage is shown on the display

Note: Output voltage must always be lower than the input voltage.

Pinout

• IN+ – Input positive
• IN- – Input ground
• OUT+ – Output positive
• OUT- – Output ground

Specifications

Voltmeter display

• Displays output voltage in real time
• Allows easy and precise voltage adjustment without external tools

Common applications

• Powering Arduino and ESP32 from higher voltage sources
• Battery voltage regulation
• DIY bench power supplies
• LED strips and lighting systems
• Automotive and 12V system voltage conversion
• Charging circuits and embedded systems

Important notes

• Not a boost module – cannot increase voltage
• Ensure proper cooling when drawing high current
• Always verify voltage before connecting sensitive devices

Tip: This module is ideal when you need a quick, adjustable power supply with built-in voltage monitoring.