At least, that was the theory of this gadget. The acoustic switch operates a first electrical appliance upon receipt of a first . I believe it just has a mic and when the incoming sound spikes twice in a short period of time, it flips a switch. Like yelling or playing loud music . A second clap within 1. The Clapper , Wireless Sound Activated On/Off Light Switch , Clap Detection, Perfect For Kitchen/Bedroom/TV/Appliances, 1V . One of these transistors drives a heavier transistor which controls a lamp. This circuit can switch on and off a light, a fan or a radio etc by the sound of a clap.

Mic converts the sound signals from your claps into small electrical signals. The first opamp of the lm3amplify these small signals. MK1Clap On/ Off Switch electronic construction kit allows you to operate your lighting simply by clapping your hands.

Clapping hands together switches an LED on or off in this Arduino breadboard project for beginners. Hand claps are detected by an electret .