How to Make Continuity Tester Using BC547 Transistor

Hii friend,

Today I am going to make a circuit of continuity tester.Using this circuit we can test continuity of many components like as Diode, LED etc.This circuit I will make using BC547 transistor.

Let's get started,

Components required -

(1.) Transistor - BC547 x1

(2.) LED - 3V x1

(3.) Resistor - 220 ohm x2

(4.) Resistor - 10K x1

(5.) Buzzer x1

(6.) Battery clipper (Remove from old battery) x1

(7.) Battery - 9V x1

(8.) Probes (+ve probe and -ve probe)

Pins of BC547 transistor

Solder emmiter pin of transistor to +ve pin of battery clipper as shown in the picture.

Next we have to solder 10K resistor between Base pin and emmiter pin of the transistor as you can see in the picture.

Solder 220 ohm resistor to base pin of the transistor as solder in the picture.

Solder +ve pin of buzzer to -ve of battery clipper and

Solder -ve pin of buzzer to collector pin of the transistor as solder in the picture.

Solder 220 ohm resistor to +ve leg of LED.

Next we have to solder LED to the circuit.

Solder +ve leg of LED to -ve of battery clipper and

-ve leg of LED to collector pin of transistor as you can see in the picture.

Now Solder +ve probe to -ve of battery clipper and

Solder -ve probe to 220 ohm resistor which is solder in the base of transistor as you can see in the picture.

Now our circuit is ready so Connect battery to the battery clipper and use this circuit for continuity test.

As we can test Diodes,Wires,LEDs etc.

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Thank you