The Clapper Light

The clapper light is an interesting circuit which turn on the lights when you clap your hands near to the connected mic. So this circuit is known as ” The Clapper Light” But some time it will turn on when any sounds equal to the wavelength of clap sound. The main circuit contains a single 555 IC and a condenser mic. The condenser mic is act as the sensor to sense the external clap sounds.

The condenser mic normally converting the sound energy into an electric energy, that will trigger the 555 IC to turn on the circuit diagram. If the 555 IC got any triggering signal from the condenser mic then the output pin of 555 IC gets high and turn on the light.

When any clap sound detected by the condenser mic the IC turn on after some time the light gets turned off. The light remain on for some minutes then only its gets turned off. This circuit diagram is a very simple and sensitive one, lot of clap switch circuits are available in in internet but the 555 based circuit is very easy to build.

How Does The Clapper Light Switch Work

When any clap sound detected the condenser mic gets activated ( The sound energy converted into electrical energy ) this triggering electrical voltage turn on the 555 IC. The IC gets trigger to turn on the output connected lights.

Components

  • 555 Timer IC
  • Condenser Mic
  • BC 547 Transistor
  • 220, 1k, 100k Resistors
  • 10uF Capacitor
  • LED Lights
  • 9V Battery
  • Bread Board and Wires ( optional if you are assembling on breadboard )

Clap Light Circuit Diagram

Clap Light Circuit Diagram

You can see the complete circuit of clapper light. The electronics components are mentioned near to the corresponding component. In initial stage the Q1 transistor is in OFF state, Because their is no required voltage is getting to open the transistor.

Point A is connected to the positive voltage of the battery through a 1K resistor and it straight goes to the triggering pin of 555 IC. As we know that the 555 IC pin number 2 voltage needs VCC/3. The Pin 2 is in high potential state so the LED is OFF.

Any clap sound produced near to the condenser mic, the mic convert the sound energy to electrical energy and then the energy passing through the second pin of the condenser mic. Then a minute negative potential reaches to the base pin of BC547 transistor. In that time the transistor turn off and it happens in milli seconds and a triggering potential difference is generating in point A. In that time 555 IC turn on and light gets glow.

After some time passed the connected LED lights get turn OFF automatically because of the circuit diagram is designed. The 555 IC is in Monostable Mode. Led will turn on the time is determined by 1.1*R1*C1. From the formula we can change the turn on duration by changing the resistor and capacitor value. We can easily redesign the circuit to integrate it with AC circuits. To use this same circuit is an AC circuit, you need to add a relay circuit instead of the lights connected with the circuit. 12v adapter or 12 v transformer with proper AC to DC rectifier is using when you are planning to connect with AC circuits.

  • From the circuit most of the viewers not find the voltage rating of the capacitor, you can use 16v or above voltage rated capacitor to build this circuit.
  • If you want to connected high power rated led lights you need to add a relay circuit and connect the light through the relay contacts.
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