Clapping Switch With BC547 Transistor

Introduction: Clapping Switch With BC547 Transistor

About: Share diy projects to those who have the same hobby with me

Hii Friend,

Today I am going to make a circuit of Clapping switch with BC547 Transistor.In Earlier We made clapping switch using LM555 IC.

Let's get started,

Step 1: Take All Components As Shown Below

Components required -

(1.) Transistor - BC547 x1

(2.) Microphone x1

(3.) Capacitor - 25V 47uf x1

(4.) Resistor - 1M x1

(5.) Resistor - 10K x1

(6.) Resistor - 120K x1

(7.) Battery - 9V

(8.) Battery clipper

(9.) LED - 3V x1

(10.) Resistor - 220 ohm x1

Step 2: Transistor - BC547

C - Collector

B - Base and

E - Emmiter

Step 3: Circuit Diagram

This is the circuit diagram of this project.

Connect all components according to this circuit diagram.

Step 4: Connect Both Transistors

Firstly we have to connect both transistors.

Solder Collector Pin of transistor-1 to Base pin of transistor-2 as solder in the picture.

Step 5: Connect 47uf Capacitor

Next we have to connect 47uf capacitor.

Solder -ve pin of capacitor to base pin of transistor-1.

Step 6: Connect Emmiter Pin of Both Transistor

Next Solder emmiter pin of transistor-1 to transistor-2 as solder in the picture.

Step 7: Connect 10K Resistor

Solder 10K Resistor to +ve pin of capacitor.

Step 8: Connect 1M Resistor

Next solder 1M Resistor to base pin of transistor-1.

Step 9: Connect 120K Resistor

Solder 120K Resistor to collector pin of transistor-1 as solder in the picture.

Step 10: Connect 220 Ohm Resistor

Solder 220 ohm resistor to -ve leg of LED.

Step 11: Connect LED to Circuit

Solder 220 ohm resistor which is connected to -ve leg of LED to the Collector Pin of Transistor-2 as solder in the picture.

Step 12: Connect +ve Leg of LED

Solder +ve leg of LED to 10K,1M and 120K resistor as you can see in the picture.

Step 13: Connect MIC

Solder +ve wire of MIC to +ve pin of Capacitor and

solder -ve wire to emmiter pin of Transistors as you can see in the picture.

Step 14: Connect Battery Clipper Wire

Now we have to connect battery clipper wire to the circuit.

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

solder -ve wire of battery clipper to Emmiter pin of transistors as you can see in the picture.

And Connect Battery to battery clipper.

To activate LED Do Clap.

Thank you

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    Law Breaker
    Law Breaker

    Question 2 months ago

    LED keeps glowing the whole time even if mic is not connected


    Question 5 months ago on Step 3

    Can you tell me the operation principle of this circuit please


    Question 1 year ago on Step 3

    Hey there! What minimum voltage is required to bias a condenser mic?


    Answer 1 year ago

    As an LED is involved with a transistor and a 220 ohm resistance in series, at least 5 volt must be given. Well to have better operation with the resistance values, I think 9 volt supply, as suggested in the circuit, is reasonable.


    1 year ago

    This is simple yet useful circuit. Simply by looking at the circuit, neurons release to start assembling it. However, it would have been great if the theory and physics of the working of toggle activity of each transistor of the circuit would have been explained. Wish to get a response, if any, of the author of the post. -:) . Regards and Thanks in advance.