Adjustable DC-DC Buck Converter 3A with Voltmeter

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Adjustable DC-DC buck converter (~3A) with an onboard LED voltmeter — drop a higher DC supply down to the rail your board, charger pad, or test fixture needs.

Repair-bench staple for phone / tablet / PCB work: stable 3.3V / 5V / 9V / 12V / 24V-style targets from a common DC input without hunting another PSU brick.

Features

- LM2596-class adjustable step-down module with red LED voltmeter

- Typical input about 4–40V DC; set output for common rails (3.3V / 5V / 9V / 12V / 24V class)

- About 3A class continuous (derate with heat; confirm on your unit under load)

- Screw terminals for quick bench wiring; trimmer pot for fine voltage set

- Compact PCB footprint for fixture boxes and under-bench power strips

How to use

- Wire input polarity carefully (IN+ / IN−), then set output with a light test load before full current

- Use the voltmeter / a multimeter to dial the target voltage

- Add a heat sink or airflow if you push toward the 3A end of the range

- Never reverse polarity or feed AC mains into this module

Typical jobs: phone-repair fixture rails, charger-port test pads, powering modules on the bench, USB-adjacent 5V taps from a higher DC pack.