BMT Adjustable DC-DC Buck Converter Module LM2596S 3A LED Display

The BMT ADJ DC/DC MODULE 3A+DISPLAY is a high-efficiency, step-down (buck) voltage regulator module based on the reliable LM2596S switching regulator IC. It is designed to convert higher DC voltages into stable, lower adjustable DC voltages with excellent efficiency, making it ideal for electronics projects, power management systems, DIY applications, and embedded systems.

This module features a built-in 3-digit LED digital voltmeter display, allowing real-time monitoring of voltage (input or output depending on configuration), eliminating the need for an external multimeter during setup and operation. With its compact size, high current capability, and wide voltage range, it is perfectly suited for both prototyping and permanent installations.

Core Functionality

The module operates as a DC-DC step-down (buck) converter, meaning it reduces a higher input voltage to a lower output voltage while maintaining high efficiency and low heat dissipation. The LM2596S chip uses high-frequency switching technology (150kHz), which enables compact design, better thermal performance, and stable voltage regulation under varying loads.

Important Requirement:

The input voltage must always be at least 1.5V higher than the output voltage for stable regulation.

Key Features

Wide Input Voltage Range: 4V - 40V DC

Wide Output Voltage Range: 1.25V - 37V DC (continuously adjustable)

High Current Capability:

2A continuous stable current

Up to 3A maximum (with adequate cooling)

Integrated Digital Display:

Real-time voltage monitoring

Voltmeter range: 0-40V

Accuracy: 0.1V

High Efficiency Switching Regulator

Large Copper Area PCB for improved heat dissipation

Compact and lightweight design

Simple screw terminal connections for easy wiring

Potentiometer voltage adjustment for precise output control

Built-in Digital Voltmeter

The integrated 3-digit LED display makes setup and operation extremely convenient:

Monitor voltage directly on the module

No need for external measurement tools

Fast setup for bench testing, prototyping, and tuning

Improves safety by preventing accidental over-voltage to sensitive components

Technical Specifications

Electrical Parameters:

Input Voltage: DC 4-40V

Output Voltage: DC 1.25-37V (adjustable)

Minimum Voltage Differential: 1.5V

Output Current:

Stable: 2A

Maximum: 3A

Switching Frequency: 150kHz

Conversion Type: Buck (Step-down)

Display Voltage Range: 0-40V

Display Accuracy: 0.1V

Thermal Design:

Large copper heat dissipation area on PCB

Suitable for passive cooling at low currents

Heatsink recommended for high-current continuous use

Applications

This module is extremely versatile and suitable for:

Arduino & Raspberry Pi power supplies

Battery-powered systems

Robotics and automation projects

IoT devices

DIY electronics

LED power regulation

Electronics labs and testing benches

Automotive DC power conversion

Solar and off-grid systems

Embedded power regulation solutions

Installation & Use

Connect DC power source to input terminals

Connect load to output terminals

Power on module

Use the potentiometer to adjust output voltage

Monitor voltage on the digital display

Ensure input voltage is always output voltage + 1.5V

Safety Notes

Never exceed 40V input

Always maintain required voltage differential

Use heatsinking for high current applications

Ensure correct polarity

Do not short circuit output terminals

Why Choose This Module?

High efficiency

Digital voltage monitoring

Wide voltage range

Reliable LM2596S regulator

Compact and robust design

Easy integration

Cost-effective

Professional-grade performance

Perfect for Makers, Engineers, Technicians, Students, and Hobbyists

Whether you're building a prototype, regulating power for a project, or creating a permanent power solution, the BMT ADJ DC/DC MODULE 3A+DISPLAY offers reliability, accuracy, safety, and convenience in one compact module.

What's in the box
1 x BMT ADJ DC/DC MODULE 3A+DISPLAY LM2596S Buck Converter 4-40V In 1.25-37V Out