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 see the steps for making 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: 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.