AC-DC Buck Step-Down Power Supply Module 2A Adjustable Converter
AC-DC Buck Step-Down Power Supply Module 2A Adjustable Converter
AC-DC Buck Step-Down Power Supply Module – Adjustable 2A Converter with Rectifier Filter
This compact and versatile AC-DC Buck Power Supply Module is the ideal solution for electronics hobbyists, engineers, and DIY enthusiasts who need a reliable, adjustable regulated voltage output. Whether you're powering microcontrollers, sensors, or custom circuits, this step-down converter delivers stable DC output from both AC and DC input sources — all in a tiny 36 × 29 × 23 mm footprint.
Made in Mainland China.
Why Choose This Step-Down Converter?
- Dual Input Compatibility: Accepts AC input (5V–20V) via screw terminal AND DC input (5V–32V) via solder pad — maximum flexibility for your project.
- Wide Adjustable Output: Dial in any DC output from 3.3V to 18V to match the exact requirements of your circuit or device.
- Up to 2A Output Current: Handles moderate current loads, making it suitable for a broad range of electronics projects.
- Built-in Rectifier & Filter: The onboard rectifier and filter capacitors smooth out AC input, delivering clean, regulated DC output without external components.
- Clearly Labeled Terminals: Color-coded green screw terminals for AC input (AC), output positive (V+), and output ground (GND) make wiring fast and error-free. DC input pads are also clearly marked (V+ / V−).
- Ultra-Compact Design: At just 36 × 29 × 23 mm, this module fits easily into enclosures, breadboards, and prototype assemblies.
Technical Specifications
| AC Input Voltage Range | AC 5V – 20V |
| DC Input Voltage Range | DC 5V – 32V |
| Output Voltage Range | DC 3.3V – 18V (adjustable) |
| Max Output Current | 2A |
| Dimensions (L × W × H) | 36mm × 29mm × 23mm |
| AC Input Terminal | Green 2-position screw terminal (AC) |
| DC Output Terminals | V+ (positive), GND (negative) screw terminal |
| DC Input Pads | V+ (positive), V− (negative) solder pads |
| Country of Origin | Mainland China |
What's in the Box?
- 1× AC-DC Buck Power Supply Module
Important Notes
- Due to lighting and screen color differences, the item's actual color may vary slightly from product images.
- Please allow 1–3 cm tolerances due to manual measurement.
Helpful Resources
For safe handling of electronic components and electrical DIY projects, refer to OSHA's electrical safety guidelines: OSHA Electrical Safety.
Frequently Asked Questions
Q: Can this AC-DC buck module accept both AC and DC input simultaneously?
A: No, you should use either the AC input terminal (AC 5V–20V via screw terminal) or the DC input pad (DC 5V–32V) — not both at the same time. Choose the input that matches your power source for safe and correct operation.
Q: How do I adjust the output voltage on this step-down converter?
A: The output voltage is adjusted via the onboard trimmer potentiometer. Turn it carefully while monitoring the output with a multimeter until you reach your desired voltage between 3.3V and 18V.
Q: Is this buck module suitable for powering Arduino or Raspberry Pi projects?
A: Yes! With a selectable output of 3.3V or 5V and up to 2A output current, this module is well-suited for powering microcontroller boards like Arduino and Raspberry Pi, as well as sensors, relays, and other low-voltage DIY electronics.
Q: Does this module require any external components for filtering?
A: No additional filtering components are required. The module features a built-in rectifier and filter circuit, which converts AC input to smooth, regulated DC output internally.