clap switch

Imagine you are sitting in your living room, enjoying the compa-ny of a few friends, when you notice that evening is approaching and the daylight is beginning to fade. Suddenly you clap your hands, and -hey presto-the light comes on! Not only have you spared yourself the trouble of leaving the comfort of your chair, but you have `dazzled` the as-sembled guests with the magical powers of your electronic wiz-ardry. The following article describes how to achieve this impressive effect by building a simple `clap-activated switch`, which should cost not much more than£ 10.