Amazing Idea With Relay & BC547 Transistor

Introduction

This circuit is used as voltage level indicator and short circuit protection circuit. The LED in it is used to determine the magnitude of the LED in which the Red Color LED stands for 10 voltage, the yellow for 11 voltage and the Green LED for 12 voltage. In this circuit, when the output wire is short, the power is cut.

Components Needed 

• 12v Relay – 1no
• BC547 Transistor – 1no
• 220 ohms Resistor – 1no
• 100 ohms Resistor – 1no
• 1k Resistor – 1no
• zero board – 1no
• LED – 3no
• Micro switch – 1no
• 2 Pin Screw Terminal – 2no

Circuit Diagram

Tools Needed 

• Soldering Iron
• Cutter
• Soldering Iron Stand
• PCB Holding Stand