DIY Kit LM317 Adjustable Regulated Voltage 110V 220V to 1.25V-12.5V Step-down Power Supply Module PCB Board Electronic kits

DIY Kit LM317 Adjustable Regulated Voltage Power Supply Module

Turn any 110 V or 220 V mains source into a precise, low‑noise DC output with the LM317 Adjustable Regulated Voltage Kit. Designed for hobbyists, engineers, and educators, this step‑down power supply module lets you dial in voltages from 1.25 V up to 12.5 V with a simple potentiometer, making prototyping and testing faster and safer.

Key Highlights

• Wide input range: 110 V / 220 V AC (auto‑sensing)
• Continuously adjustable output: 1.25 V – 12.5 V DC
• High‑precision LM317 regulator for stable voltage and low ripple
• Compact PCB layout with clear silk‑screen markings for easy assembly
• Includes heat‑sink, potentiometer, input filter capacitors, and protection diodes
• Perfect for Arduino, Raspberry Pi, sensor modules, LED drivers, and more

Why Choose This Kit?

Whether you’re building a robotics project, testing a new circuit board, or teaching electronics fundamentals, this kit provides a reliable, adjustable power source without the need for bulky bench supplies. The LM317’s built‑in current limiting and thermal overload protection keep your components safe, while the low‑cost design saves you money.

What’s Inside

• 1 × LM317 adjustable regulator PCB (pre‑drilled, ready for solder)
• 1 × 10 kΩ potentiometer (output voltage adjustment)
• 2 × 470 µF electrolytic capacitors (input filtering)
• 1 × 0.1 µF ceramic capacitor (output smoothing)
• 1 × heat‑sink for the LM317
• 1 × protective diode and 1 × fuse holder
• Comprehensive assembly guide and schematic diagram

Typical Applications

• Microcontroller development boards (Arduino, ESP32, etc.)
• LED strip and lighting projects
• Battery charging circuits
• Sensor and instrumentation power rails
• Educational labs and electronics workshops

Technical Specifications

• Input Voltage: 110 V / 220 V AC (auto‑detect)
• Output Voltage: 1.25 V – 12.5 V (adjustable)
• Maximum Output Current: 1.5 A (LM317 limit)
• Regulation Accuracy: ±1 % (typical)
• Operating Temperature: -20 °C – 85 °C
• Dimensions: 80 mm × 50 mm × 15 mm (PCB)
• Compliance: CE, RoHS

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