Clap Switch Circuit Diagram and Its Working

An electronic device that can turned and off by clap is called clap switch. It can control light appliances by users clap action also. It was invented by Stevens, R Carlile, and E Dale Reamer in 1996. The main advantage of this circuit or device is that it is mainly helpful for a mobility-impaired person. The condenser mic is one of the main part of the circuit that take input clap sound based on the pitch of clap. This article gives an overview of the clap switch. Electcrical pulses are the desired input to the clap switch circuit. .

What is Clap Switch

Definition: A clap switch is an electronic circuit or device that controls electrical appliances like tube lights, energy saver, LED bulb etc with user clapping action. It is mainly useful for a person who cannot move from one place to other for switching on or off electrical or electronics applances. Clap switch circuit can be designed in varity of ways now a days electronics studens are designing this circuit by using decade counter ic 4017.

Circuit switch Circuit Diagram

This is very simple circuit you can change its design according your your requirements.

Clap on off switch with ic 4017

These sounds vibrations are given to the Base point  of transistor BC 557 (a PNP transistor). It amplifies the sound collected by the Mic. Transistor collector point is connected with IC point 14 which is clock point. When clock e is received from Amplifier Transistor BC557.
IC 4017 is a decade counter IC which is wired as a toggle switch. That its outputs 1 and 2  becomes high and low when the input pin 14 receives pulses.  output4 (pin4) is connected to the reset pin 15 so that further counting restricted. The high output from IC 4017 passes through resistor to the base of switching transistor BC557. When BC557 conducts, Red LED (indicator LED) turns on.  A 6V 100 ohms relay is connected to the points marked (A and B), the relay turned on and 220v AC pass through the relay and bulb or any other electrical appliance Switched on. In the next clap output pin 2 becomes low and relay and indicator LED switched off.

PART LIST For Clap switch circuit

  •  Prototyping board (Roughly 1″ by 1″) or bread board.
  • 9v connector
  • BC 547 transistor (npn)
  • BC 557 Transistor (pnp)
  • IC 4017
  • 22k resistor
  • 470 ohm resistor
  • 1k resistor
  • 6v relay
  • 9v battery


The following are the advantages of clap switch

  • It is reliable and low cost circuit
  • It is an advantageous technology for mobility-impaired person
  • Automatically controls lights within a specified range by clapping action
  • It provides good output efficiency and can control high load.


The following are the disadvantages of clap switch

  • The filter should be added in the circuit compulsorily for working.
  • It is cumbersome compared to traditional control switch and it can be operated even by unknown person.


The following are the applications of clap switch

  • to on or of LED light
  • Air conditions
  • Tv
  • Motor, etc.


1).Who invented the clap switch?

The main fonder of this idea and circuit was R Carlile, Stevens.

2).When it was invented

The first clap switch circuit was invented on feb 1996

3). Name two main applications of Clap Switch?

The two main applications are

  • LED ligh
  • Fans

4). Is the Clapper a fire hazard?

No, the Clapper is not a fire hazard its save

5). What is the main principle of a clap switch?

Clap switch converts sound energy into electrical pulses as input to the circuit and provides an output in order to control light appliances.

6). Can it work by all persons claps

yes normaly it can operate by the claps of all person but you can specify its working like it will work with 2 or 3 claps or turned off by 2 or more than 2 claps.