Clap switch

In order to make a clap switch, we have to combine the  touch sensor(monostable mode of 555 and the transistorized dark sensor circuits. Whenever there is loud sound produced near the electret condenser mic, pin 2 of 555 gets triggered and it switches on the LED D1. The LED remains on for a definite time determined by R1 and C1. We can adjust the sensitivity of the circuit using a variable resistor in place of fixed resistor R5. You can check the circuit with 1K or 10K.

The schematic of clap switch:

You can purchase this kit at BuildCircuit

  • 4 In 1 DIY Kit- Dark Sensor, Clap Switch, Latch Switch And Astable Multivibrator

    US $10.50
    56 items sold

    4 In 1 DIY Kit- Dark Sensor, Clap Switch, Latch Switch And Astable Multivibrator

    US $10.50
    56 items sold

    This is a simple 4-in-1 do-it-yourself (DIY) kit from BuildCircuit. The kit has four different circuits that can be switched on separately or together at a time using a DIP switch.

    The four circuits are: Dark sensor using LDR,  A latch circuit using NE555 timer, Astable circuit using NE555 timer,  A clap-switch circuit using NE555 timer.

    30 in stock

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You can see the steps for making a clap switch on the video given below.

Please check the following video tutorial

If you want to glow a bulb operating at 220V, use the following schematic:

clap switch operating 220V bulb

Before you make this project, read carefully about RELAYS: http://www.buildcircuit.com/how-to-use-a-relay/ If you are not confident at making circuits, don’t work with 220V, it can be dangerous and harm you.

Related projects:


BuildCircuit is now selling a fully assembled clap switch that can operate 220V lamps. The first clap keeps the lamp on and the second clap keeps it off.

  • 100-240V AC Light Bulb Controllable FULLY Assembled Clap Switch

    US $13.95
    26 items sold

    100-240V AC Light Bulb Controllable FULLY Assembled Clap Switch

    US $13.95
    26 items sold

    This FULLY ASSEMBLED sound/clap operated switch can be used for switching your 100-240V AC light bulb. Usually, we use a clap switch to operate a lamp and it can easily do that for you. The kit responses to clap up to a distance of 5 meters, but, the further you go, the louder the clap should be.

    50 in stock

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