5)Continuity Tester Using BC 547

Introduction:

This Project Is “How To Make A Continuity Tester” Using BC 547 NPN Transistor.Normally, We Use Multi meter To Check Continuity At Our Winding Centre & Shop.But We Haven’t Multi meter At Home or Other Workplaces.That Time, We Use This Simple Continuity Tester.

Working:

This Circuit Is Worked Similar That The 220 Volt AC Test Lamp, Which We Used For Check Continuity To The Electrical Spare Parts And Winding Of The Electrical Motors. In This Circuit, I Used The BC 548 NPN Transistor To Make Continuity Tester. The Base (2) Pin Of The Transistor Is Connected Seriously With The 4.7KΩ Resistor. These Base Line of the Transistor When Connected To the (+) ve Of the Power Supply, Then LED Light’s On.

Part List:

1) BC 547 Transistor=1

2)10Ω ¼w Resistor=1

3)4.7KΩ ¼w Resistor=1

4)5mm LED (any color) =1

6) AA Battery (I Provided EVERYDAY Battery)=2

7)2 Cell Holder=1

8) Testing Probes=1 set (you got from old multi meter wire)

Uses of This Project:

This Project Is Used To Test Electronic Components Like LED,Resistor,Diode And Test Electrical Components Like Switch, Fan Winding Checking Etc,.

Circuit Diagram: