Seloky LM2596 Adjustable DC-DC Buck Converter Module — Pack of 3 with LED Voltmeter, 4–40V Input, 1.25–37V Output

Seloky LM2596 is a compact, adjustable DC-DC step-down (buck) converter module with an integrated LED voltmeter that converts 4.0–40V input down to a stable 1.25–37V output for electronics projects and power supply tasks.

This three-pack of Seloky LM2596 modules pairs a proven switching regulator with an onboard numeric voltmeter, a user-configurable output, and safety features like reverse-input diodes, thermal and short-circuit protection. The modules are built around the LM2596 second-generation regulator running at a 150kHz switching frequency and employ solid capacitors to improve stability and filter high-frequency noise. They include terminal blocks for quick wiring and a small potentiometer for adjusting output voltage without soldering.

How accurate and visible is the built-in voltmeter?

The LED voltmeter shows measured voltage with an approximate ±0.1V accuracy under normal conditions and displays values while input voltage is above 4.0V. You can toggle the meter off to save power and reduce distraction.

• Measurement tolerance: ±0.1V
• Visible while input ≥ 4.0V; no display below 4.0V
• Meter can be switched off by holding the button 1–4 seconds
• Tap the button briefly to re-enable the display

How do I set the output voltage and connect devices?

Use a small screwdriver to turn the onboard potentiometer until the voltmeter (when enabled) reads the desired output. The module provides screw terminal blocks for input, output, and ground, so many users can connect wires without soldering.

• Output adjustable from 1.25V up to 37V
• Input range 4.0V to 40V (monitor display requirement)
• Terminal blocks for quick, solder-free wiring
• Fine adjustment via mini screwdriver on the trimmer

What protections and reliability features are included?

The Seloky module incorporates input-side diodes to prevent damage from reverse connection and includes thermal and short-circuit protection. Solid electrolytic capacitors and a regulated switching design help maintain stable output under varying loads.

• Reverse-input protection via diodes
• Overheat and short-circuit protection built in
• Solid capacitors for improved stability and noise filtering
• Recommended heat dissipation for loads above ~15W

Which use cases is this module suited for?

The LM2596 buck converter is versatile for automotive power, bench supplies, DIY electronics, hobbyist projects, and light industrial applications. Its adjustable range and protected design make it useful for prototyping and field repairs where a compact, efficient DC regulator is needed.

• Car accessory power conversion and USB adapters (with extra circuitry)
• Bench power supplies for electronics development
• DIY and maker projects requiring regulated DC voltages
• Repair or retrofitting of small devices that need stable voltages

Who is this for? The Seloky LM2596 pack of three is aimed at hobbyists, technicians, and small-scale installers who want an affordable, adjustable DC-DC step-down module with a clear voltmeter and basic protections. It’s ideal when you need multiple modules for testing, parallel projects, or spare units—especially if you value quick wiring via terminal blocks and easy voltage trimming without soldering. For higher continuous power demands, plan for extra heatsinking or airflow to keep the regulator within safe temperature limits.