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Monday, July 27, 2020

How to make a variable power supply using LM317 with short circuit protection

In this tutorial, I will show you how to make a variable power supply using LM317 with short circuit protection.

If you prefer video mode or like to watch the circuit working please click here to watch the video on YouTube

Parts List
  • 1 * LM317
  • 1 * 5K Trimmer
  • 2 * 1N4001
  • 1 * Heat Sink
  • 1 * 0.01uF Ceramic Capacitor
  • 1 * 10uF/25V or 10uF/25V Electrolytic Capacitor
  • 1 * 120 or 330 Ohm Resistor
Theory
    
    In this project, the main components are LM317 which is a monolithic integrated circuit intended for use as a positive adjustable voltage regulator. The LM317 is designed to supply more than 1.5A of load current & output voltage up to 1.2 to 37V range.

    The output voltage of the LM317 is dependent on the input voltage. For example, if you supply 40V which is the absolute maximum voltage which can be handled by LM317, the output voltage you will receive is up to 37 Volts.

    Note: LM317 should be connected to the heat sink because it generates a lot of heat while connected to a load

The two diodes 1N4001 is used to protect the Lm317 from any short circuit
  • Diode D1 protects from any internal short circuits
  • Diode D2 protects from any external short circuits
The 5K trimmer can be used to adjust the output voltage.

If your input voltage is less than 25V then use the electrolytic capacitor 10uF/25V and if your voltage is above 25V then use 10uF/50V.

Circuit Diagram



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