Clap Activated Switch

This circuit has been designed to respond only to two hand claps which occur in (relatively) quick succession, and to ignore one hand clap or even continuous clapping, as well as most other sounds which normally have a lower frequency contents than a hand clap. Even so, the system is not foolproof but is should be adequate for simple domestic applications such as switching lights on and off.The circuit diagram and the accompanying timing diagram will be discussed briefly to explain the basic operation of the circuit.