LM317 Adjustable DC Power Supply Kit – DIY Electronics Teaching & Training

LM317 Adjustable DC Power Supply DIY Kit — 1.25V–37V / 1.5A

This LM317 adjustable power supply DIY kit is a hands-on electronics teaching project that demonstrates linear voltage regulation using the classic LM317T IC. Assemble the through-hole components to build a fully functional adjustable DC power supply with output from 1.25V to 37V at up to 1.5A — ideal for electronics labs, STEM education, and beginner makers.

Key Specifications

Parameter	Value
Regulator IC	LM317T (TO-220)
Output Voltage Range	1.25V – 37V (adjustable)
Output Current (Max)	1.5A
Input Voltage	3V – 40V DC (or AC with rectifier)
Voltage Adjustment	Onboard potentiometer
Output Ripple	<50mV typical
PCB Size	~60 × 40mm
Assembly Type	Through-hole DIY kit (unassembled)

What You’ll Learn

• How linear voltage regulators work (LM317 operation principle)
• Voltage divider feedback for adjustable output: V_OUT = 1.25 × (1 + R2/R1)
• Capacitor selection for input/output filtering and stability
• Heatsink importance for thermal management at higher currents
• Through-hole soldering technique and PCB assembly

Why Choose This Kit?

• Classic LM317 Circuit — Teaches fundamental voltage regulation used in millions of real-world designs
• Wide Output Range — 1.25V–37V covers 3.3V, 5V, 9V, 12V, and custom voltages
• All Components Included — LM317T, resistors, capacitors, potentiometer, PCB — ready to solder
• Compact PCB — 60×40mm fits in project enclosures
• Ideal for Teaching — Clear silkscreen labels for easy component placement

Typical Applications

• Electronics classroom voltage regulation lab exercise
• Adjustable bench power supply for low-current projects
• Variable voltage source for LED brightness control
• Charging regulator for NiMH/NiCd battery packs
• Maker space beginner soldering project

FAQ

Q: Does this kit include a transformer or AC input?
A: No — the kit requires a DC input (3V–40V). Use an existing DC power supply or add a bridge rectifier + filter capacitor for AC input.

Q: Can LM317 output 5V from a 12V input?
A: Yes — set R1=240Ω, R2=720Ω for 5V output. The LM317 dissipates (12−5)×I as heat — use a heatsink above 500mA.

Package Contents

• 1× PCB
• 1× LM317T TO-220 Regulator IC
• Resistors, capacitors, potentiometer (all values per BOM)
• Terminal blocks for input/output connections

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