How to Make Variable Power Supply Using IRF3205 MOSFET

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Introduction

A variable power supply is an essential tool for every electronics enthusiast and engineer. It allows you to control the voltage according to your project’s needs. In this blog, we’ll show you how to make a variable power supply using an IRF3205 MOSFET. This simple yet powerful circuit can deliver up to 12V or more, depending on your input and configuration.

Materials for the Project

1- 4x 1N4007 DIODE

2- 1x 10K VARIABLE RESISTOR

3- 1x IRFP3205 MOSFET

4- 1X 10K RESISTOR

5- 1X 47 uF 50V CAPACITOR

6- 1X 1000Uf 35V CAPACITOR

7- PIECE OF VERO BOARD

Download Circuit Diagram

Working Principle

The IRF3205 is a powerful N-channel MOSFET capable of handling high current loads (up to 110 A). By controlling the gate voltage using a potentiometer, we can regulate how much voltage is allowed through the MOSFET, effectively controlling the output voltage.

The 10K potentiometer is used to adjust the gate voltage, and the capacitor helps filter the output for smooth DC voltage. The load is connected at the drain side, and the power source at the source pin.

⚠️ Safety Tips

Always use a heat sink with the IRF3205. It gets hot during operation.
Never exceed the voltage and current rating of the MOSFET.
Be careful with short circuits, especially when using high-current sources.