Build a simple DIY clap switch

Description: Here’s a simple DIY clap switch circuit. The circuit is mainly composed of an audio frequency and a bistable trigger circuit.

Q1 and Q2 together form an amplifier circuit. MK1 (electret microphone) accepts Clap/Audio signal and that enters to transistor Q1 through the coupling capacitor C1 and enters to Q2 base through collector directly after getting amplified. And it obtains a negative square-wave which used to trigger the bistable circuit from Q2’s collector. 

R1 and C1 restrict the frequency response of circuit to 3kHz which is in a high sensitivity range. Q4 is cutoff while Q3 is saturated and D3 is off when the power is on. When MK1(electret microphone) obtains the control signal, a negative square-wave is output after amplification and negative pulse is added to Q3 base through D1 after differentiation processing. The power flips rapidly and D3 is switched on at this time. The power flips again when MK1 obtains the control signal at the second time and the LED D3 goes off. A cable terminal J1 can be added on PCB which used for connecting external control equipment. It can realize the sound control function on other equipment by connecting J1 and relay.

A diode should be connected reversely at the ends of relay when connecting the relay. You can learn about relay from this link.

This circuit works with 6V-9V power supply. The circuit consumes 3mA when the LED is off, and it takes 6mA when the LED is on.



simplest clap switchDocuments:

1. Assembly Tutorial

Watch the video:


You can purchase this basic clap switch kit from our store.

  • Easy Clap switch- DIY kit

    US $5.50
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    Easy Clap switch- DIY kit

    US $5.50

    It’s a simple clap switch DIY kit for electronics beginners, hobbyists, and students. The circuit turns on an LED on your first clap and turns it off on your second clap. There is a possibility of connecting a relay module to this circuit so that you can turn on a 110V-220V AC lights with your claps easily.

    8 in stock

    Frequently bought together

    Relay module for Clap switch- Operate 100-240V AC Appliances

    This relay module can be connected to the basic clap switch DIY kit and you can operate a 110V-220V lamp easily.

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We are now selling a fully assembled clap switch that can turn on/off 110-220V AC lights.

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

    US $13.95
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    100-240V AC Light Bulb Controllable FULLY Assembled Clap Switch

    US $13.95

    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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