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A “Clap On Clap Off” switch is an interesting concept that could be used in home automation. It works as a switch which makes devices On and Off by making a clap sound. Although its name is “Clap switch”, but it can be turned ON by any sound of about same pitch of Clap sound. The main component of the circuit is the Electric Condenser Mic, which has been used as a sound sensor. Condenser Mic basically converts sound energy into electrical energy, that in turns used to trigger 555 timer IC, through a Transistor. And triggering of 555 IC works as a Clock pulse fothe r D-type flip-flop and would turn ON the LED, which will remain ON until the next clock pulse means until the next Clap/sound. So this is the Clap Switch which will turn ON witthe h first Clap and turn OFF with the second Clap. If we remove the D-type Flip flop from the circuit, the LED will be turned OFF automatically after some time and this time will be 1.1xR1xC1 seconds

Circuit Explanation

Here we are using Electric Condenser Mic for sensing the sound, transistor to trigger the 555 timer IC, 555 IC to SET & RESET the D-type flip flop and D-type flip flop to remember the logic level (LED ON or OFF) until next Clap/sound

Components Required

  • Condenser Mic
  • 555 Timer IC
  • Transistor BC547
  • Resistors (1k, 47k, 100k ohm)
  • Capacitor (10uF)
  • IC7474 more precisely DM74S74N (D-type flip flop)
  • LED and Battery (5-9v)

Video Courtesy: MakeloGy

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