🔌 Relay Module PCB

A compact 5V Relay Module PCB designed using Proteus 8 Professional for controlling high-power loads using low-power digital signals.

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📌 Overview

This project implements a transistor-driven relay circuit and converts it into a PCB layout.
It allows microcontrollers like Arduino to safely and efficiently switch electrical appliances.

📏 PCB Dimensions: 34mm × 53mm

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⚙️ Features

• 5V relay switching
• Transistor-based driver circuit
• Flyback diode protection
• LED indicates relay activation (ON state)
• Compact PCB design

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🛠️ Components

• 5V Relay
• NPN Transistor (BC547 / 2N2222)
• Diode (Flyback Protection)
• Resistors (including base resistor for transistor biasing)
• LED

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🔄 Working

A 5V digital input signal is applied to the transistor base through a resistor.
This turns the transistor ON, allowing current to flow through the relay coil.
The relay gets energized and switches the connected load.

A flyback diode protects the circuit from voltage spikes, and the LED indicates when the relay is active.

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🖼️ Preview

🔹 Schematic

🔹 PCB Layout

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🔌 Applications

• Home automation
• Arduino / IoT projects
• Appliance control

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⭐ Support

If you like this project, consider giving it a ⭐ on GitHub!