LM317 DIY Adjustable Buck Power Supply Kit 1.25V–12V PCB
LM317 DIY Adjustable Buck Power Supply Kit 1.25V–12V PCB
LM317 DIY Adjustable Regulated Power Supply Kit — 110V/220V AC to 1.25V–12V DC
Build your own versatile, adjustable regulated power supply with this comprehensive LM317 DIY Kit. Whether you're a hobbyist, student, or electronics enthusiast, this step-down buck power supply module converts standard AC mains (110V or 220V) into a smooth, adjustable DC output ranging from 1.25V to 12V — perfect for powering a wide range of DIY projects and small electronic devices. Made in Mainland China.
Why You'll Love This Kit
- Wide Adjustable Output: Dial in exactly the voltage you need — from 1.25V up to 12V — with easy, on-board adjustment.
- Built-In Voltmeter Display: Monitor your output voltage in real time directly from the module — no external multimeter needed during setup.
- Educational Circuit Diagram: The PCB is printed with a full circuit schematic, making it an excellent learning tool for understanding power supply circuit principles.
- Universal AC Input: Compatible with both US (110V) and EU (220V) mains — just select the appropriate plug option.
- Comes with Enclosure: Includes a compact casing (144.4 × 75.7 × 42 mm) to house your finished build cleanly and safely.
- Great for DIY Projects: Ideal for powering breadboard experiments, Arduino projects, small motors, LED arrays, and other low-power electronics.
Technical Specifications
| Input Voltage | 110V AC / 220V AC (US/EU plug optional) |
| Output Voltage | Approx. 1.25V – 12V (adjustable) |
| Maximum Output Current | ~200 mA at 5V output |
| Power Rating | 2W |
| PCB Board Size | 98 × 62 mm |
| Casing Size | 144.4 × 75.7 × 42 mm |
| Regulation IC | LM317 adjustable voltage regulator |
| EU LVD Compliance | Low voltage: Below 50V AC or 75V DC |
| Country of Origin | Mainland China |
What's in the Box
- 1× LM317 Power Supply DIY Kit (PCB board, components, and casing)
Important Notes
- Due to screen and lighting differences, actual product color may vary slightly from images.
- Please allow a tolerance of 1 mm–1 cm due to manual measurement.
- This kit involves working with mains AC voltage. Always exercise proper electrical safety precautions during assembly. Refer to OSHA's Electrical Safety Guidelines for best practices.
Frequently Asked Questions
Q: What is the LM317 adjustable regulated power supply kit used for?
A: The LM317 DIY power supply kit is used to convert standard 110V or 220V AC mains power into a smooth, adjustable DC voltage between 1.25V and 12V. It's ideal for powering small electronics, DIY projects, Arduino boards, LED strips, breadboard circuits, and other low-voltage applications that require a stable, adjustable power source.
Q: Is this kit suitable for beginners in electronics?
A: Yes! The PCB board is printed with a full circuit schematic, making it an excellent learning tool. Beginners who have basic soldering skills and a general understanding of electronics safety can assemble and use this kit. It is especially popular as an educational electronics project.
Q: What is the maximum output current this power supply kit can deliver?
A: At a 5V output setting, this LM317 power supply module delivers a maximum current of approximately 200 mA. This is suited for low-power electronics and small DIY projects rather than high-current applications.
Q: Does the kit work with both US and European wall outlets?
A: Yes. This kit supports both 110V (US) and 220V (EU) AC input. Simply select your preferred plug type when ordering to ensure compatibility with your local power outlet.