dpelectronics CLAP SWITCH Educational Electronic Hobby Kit

Working of Clap Switch Working principle of clap switch circuit is based on the above discussion. In this clap switch, circuit clap is acting as a pulse for the flip-flop circuit. For example, suppose initially output is high (i.e. on state), when clap sound is generated output becomes 0 and the equipment connected to the output of clap switch circuit will be in off state. Thus by generating clap sound, the output get reversed. The output of flip-flop circuit is unable to drive the relay circuit. Therefore we have to use an amplifier for amplifying the current. To overcome this problem we have used a current amplifier by using a transistor Q4 in common emitter mode. Thus the output of this current amplifier is sufficient to operate the electromagnetic relay which is used to connect the electrical equipment to the clap switch circuit.