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.
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Step 1: Take All Components As Shown Below
Step 2: Transistor BC547
Pins of BC547 transistor
Step 3: Solder Transistor
Solder emmiter pin of transistor to +ve pin of battery clipper as shown in the picture.
Step 4: Connect 10K Resistor
Next we have to solder 10K resistor between Base pin and emmiter pin of the transistor as you can see in the picture.
Step 5: Solder 220 Ohm Resistor
Solder 220 ohm resistor to base pin of the transistor as solder in the picture.
Step 6: Connect Buzzer to the Circuit
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.
Step 7: Connect 220 Ohm Resistor
Solder 220 ohm resistor to +ve leg of LED.
Step 8: Connect LED to the Circuit
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.
Step 9: Connect Wires of Probe
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.
Step 10: How Can We Use
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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