Electronic
Clap Switch
A simple Switch triggered by a clap.
One can control different home appliances with claps.
A simple bistable multivibrator with a LED driver does the
trick..
The Circuit is Self explanatory.
Mic input is amplified with a CE BJT amplifier and fed to the
bistable multivibrator. This toggles the output with every input
spikes. A led driver transistor is switched on and off and hence the
LED glows.
A digital verision can be constructed on similar lines using a
Toggle flip flop.