DC to DC Step Down Buck Converter Module LED Digital Voltmeter Display 6.5 to 40V Input 5V 2A Output USB Charger Power Supply Port for DIY Electronic Arduino Car Battery Phone Maker Project

DC-DC Buck Converter with USB Output and Voltmeter

The Generic Brand DC-DC step-down buck converter module combines regulated USB power and real-time voltage monitoring in one compact board. Designed for DIY electronics, automotive battery projects, Arduino-compatible builds, and maker workbenches, it accepts a 6.5-40V DC input and provides a stable 5V USB output rated up to 2A.

A built-in LED digital voltmeter measures input voltage from 4.5V to 40V, allowing users to monitor a connected DC supply without installing a separate display. The voltage reading supports calibration to improve accuracy for a specific project setup. Dedicated controls include USB output enable and low-power functions, while the USB power indicator provides quick operating-status visibility.

Reverse-polarity protection helps prevent damage from an incorrectly connected input. Overcurrent and overtemperature protection provide additional safeguards during operation. Screw terminals make input wiring straightforward, and the efficient step-down design supports low-ripple output for compatible USB-powered electronics.

Specifications

• Brand: Generic Brand
• Product type: DC-DC step-down buck converter module
• Input voltage: 6.5-40V DC
• USB output: 5V DC, up to 2A
• Voltmeter range: 4.5-40V DC
• Display: LED digital voltmeter
• Protection: Reverse polarity, overcurrent, and overtemperature
• Connections: Screw-terminal input and USB output
• Dimensions: 58 x 21 x 10 mm
• Weight: 13 g

Important: This is a step-down converter and requires an input voltage above the regulated 5V output. Actual output capability depends on input supply quality, load, wiring, airflow, and operating temperature. Verify polarity, voltage, and current requirements before connecting a device. This open circuit-board module should be installed in a suitable enclosure when protection from contact, moisture, or conductive debris is required.

Frequently Asked Questions

Can this buck converter power a 5V USB device from a car battery?

Yes. It accepts 6.5-40V DC and regulates the output to 5V through the USB port, up to the module's 2A rating. Confirm the device's requirements and secure the board appropriately before automotive use.

What voltage does the LED display measure?

The integrated digital voltmeter measures the connected input voltage across a stated 4.5-40V DC range and supports calibration.

Does this module protect against reversed input wires?

Yes. The module includes reverse-polarity protection, along with overcurrent and overtemperature protection.

What are the module dimensions?

The circuit board measures approximately 58 x 21 x 10 mm and weighs 13 g, making it suitable for compact maker and DIY installations.

Can it step 5V up to a higher voltage?

No. This is a step-down buck converter, not a boost converter. Its regulated USB output is 5V, and the specified operating input range is 6.5-40V DC.