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Clap Switch Circuit Electronic Project Using 555 Timer

Clap Switch Circuit Electronic Project Using 555 Timer & BC-547 Transistors

Clap Switch Circuit Electronic Project Using 555 Timer
Clap Switch Circuit Electronic Project Using 555 Timer & BC 547 Transistors


Clap Switch is a basic Electronics mini-project, made with the help of the basic components. Clap Switch has the ability to turn ON/OFF any electrical component or circuit by the clap sound.

It is known as Clap Switch, because the condenser mic which will be used in this Project will have an ability to take the sound having same pitch as the Clap sound as the input. Although it doesn’t mean that the sound will have to be of Clap sound, it can be any sound having the same high pitch as of Clap. We can also say that it converts the Sound energy into the Electrical Energy, because we are giving an input to the circuit as a sound whereas the Circuit gives us the output as a LED glow (Electrical Energy).

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Required Components

As already mentioned, this project is basic Electronics mini-project, so this project is made of the basic components. Following is the list of the components required to make the Clap Switch.

  1. 1K, 4.7K, 47K, 330 and 470 ohm resistors
  2. 10µF and 2 100nF capacitors
  3. Electric Condenser mic
  4. Two BC547 transistors
  5. LED
  6. 555 timer
  7. 9V Battery

Working Principle of Clap Switch Circuit

This circuit (As shown below) is made with the help of Sound activated sensor, which senses the sound of Clap as input and processes it to the circuit in order to give the Output. When sound is given as the input to the Electric Condenser Mic, it is changed into the Electrical Energy as the LED turns on. LED turns ON, as we give sound input and it turns OFF automatically after few seconds. Turn-On LED timer can be changed by varying the value of 100mF capacitor as it is connected with 555 timer whose main purpose is to generate the pulse.

Although the name of the circuit is the Clap Switch, but you are not restricted to give input as the Clap only. It can be any sound, having same pitch as of Clap so this can also be called as “Sound Operated Switch”. This circuit is mainly based on transistors, because the negative terminal of Mic is directly connected with the transistor. In this circuit, we haven’t used any Electronic Switch to turn on/off the circuit, so when you are connecting the battery with the circuit, it means your circuit is now turned ON and it will take the inputs in the form of Sound Energy. You can modify this circuit by using Relay as Electronic Switch to turn the circuit ON or OFF.

As soon as we give the sound input to the circuit, it amplifies the sound signals and proceeds them to the 555 timers which generates the pulse to the LED, making it turn ON. You are to make sure, that the negative side of the Condenser mic is connected with the amplifier or the circuit will heat-up and may not working with different models of transistors etc. You cannot increase the sensitivity of the Condenser mic for long usage, it has short range by default. It is also applicable for the LAMP, so this circuit has many opportunities for modification.

Clap Switch Circuit Diagram electronic project
Clap Switch Circuit Diagram

Advantages & Disadvantages

  1. It can used to turn ON and OFF the LED or LAMP simply, by clapping your hands.
  2. We can also remove LEDs and place a FAN or any other electric component on the output in order to get desired result.
  3. The Condenser Mic used in this circuit has the short range as a default, which cannot be varied.


Clap Switch is not restricted to turn the LEDs ON and OFF, but it can be used in any electric appliances such as Tube Light, Fan, Radio or any other basic circuit which you want to turn ON by a Sound.

You may also check these simple and easy DIY EE Projects : Electrical and Electronics Projects

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  1. Jorge Oswaldo Barrera Ciro


  2. Very useful sharing

  3. certainly very useful and easy to attempt ckt.

  4. hi sir i am intersted in daigram of electronics

  5. how can we run other devices such as radios etc in such a simple device?

  6. please send me clamp circut and digrame
    on my email if readymade is avilable please send me how many your rait of your circuit

  7. “Turn-On LED timer can be changed by varying the value of 100mF capacitor as it is connected with 555 timer” does this mean I can change the time by lowering the value of capacitor? high? please answer . thanks

  8. bulb is not permanently on/off why

  9. hi good day . I need help for this circuit . what is the purpose of the capacitor connected bet. collector pin and trigger .

  10. witch transistors can i use instead of BC547? PLEASE REPLAY

  11. How can i defend my project base on this topic

  12. Hi,
    I have been trying to build the clap switch circuit using the 555 timer chip but I don’t have any BC547 transistors. I have tried using 2N3904, C1815 and BC108 all with no success. I can’t figure out what is the problem. Can anyone help? I would be most grateful.
    Kind regards,


  13. Can we connect the switch directly to AC current

  14. kyaw zay yar lin

    Permanently on/off, how can I modify?

  15. Its seems good, but I want to remove LED with an energy saving lamp of 24 watt, can I do this. Also tell me what is the voltage at output pin of NE555. And what will be the max output current.
    Thumbs up for you… (y)

  16. Hey sir/mam,I requested you to describe me more and more applications of clap switch as a project.

  17. how can i make the ON permanently after a single clap and OFF

  18. sir/mam .. if i will put a 5 pin relay switch in the circuit where should i put it and what will be the effect of it ? please anwser me anybody …

  19. .. elow … i need help .. if i will put a 5 pin relay switch in the circuit .. where i should put it and what will be the effect of it …. plss i need some advice …

  20. can i replace the LEd with a low V amplifier ??

  21. its interesting….to design …my first project

  22. Many Many Thank`s

    Thank You With Regards.


  23. I need this cirite but i tried it for 5 times on my bread board and bought its commbounts for 5 times!!
    And its not working olease help me please

  24. bro i tried many times but everytime led is on and clap is not working 🙁

  25. I implemented this circuit on a breadboard. When I clap near the microphone, the L.E.D turns on for nearly 6 seconds and then, turns off automatically. I want to make it work like a real clap switch. For example: the L.E.D turns on the clap and turns off on a clap. Please can help me in figuring this one out.

  26. What an interesting project where i can connect and work out.
    NB,. Am doing a project on a clap switch please send for me more of the literature review about this field.

  27. hlw sir plz explain the ic points??i means 1,2,3,4,5,6…it will b easy for jointing the other compunents with IC..

  28. please admin can you for another circuit diagrame that support both on and off signals

  29. how work the clapp switch

  30. Hi, I’ve done everything as per the design but its not working. I’ve doubt on mic. Is there any way to check whether mic is working or not?

  31. dude…..for those capasitors…..what volt it is?

  32. our circuit is direct on.pls give me sollution

  33. hi mam/sir, my project has already worked, but when I accidentally short it with its aluminum casing, it didn’t worked now, the led just on when you put the 9v supply, I replace the mic and it’s two transistors but also it didn’t work out…. Pls help me!!!…. tnx

  34. Thanks Engineer for the project, am more interested in the project and i would like to request you to send me the literature review of the project in my email.

  35. Should I use electret condenser mic???????????

  36. How much volt of 10uf capacitor plz reply fast

  37. can i use 100 nf instead of 100 uf.,…………?

  38. how much of frequency and amplitude genrated while clapping our hands

  39. Sir please please please help me.
    Why my circuit isnt working.?? When i finish set up my circuit then i put the battery. The baattery light up without clapping. Its like i connect the battery directly to the LED… its hav been 2 months im working for this Final Year Project. Pleaseees. Im stress out


  40. it is working great thank you!!!!!!!
    kindly send the pcb layout of this we will be thankful.

  41. hey mens i need support i want use to us this circuit to control AC lamp what can i do

  42. HOW CAN I use this circuit to cantor ac lamps

  43. Hy mens in the working principle is that 100mF or 100Nf

  44. hy my circuit isent running help me

  45. sir the value off capacitor(10nf) in the list is not same as in circuit diagram

  46. Led is always on…no Change…what to do

  47. Nob no de na bhai please kam h mera same project h

  48. reI want to believe that other electrical appliances you can apply this to has to be DC appliances since the voltage source is 9volts else you will to apply AC signal and do rectification

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