This is a very simple touch sensor switch that is build with the 555 timer IC. You just need to touch the metal plate and the relay gets energised and is kept in this state for about 100 seconds, then ...

The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system. BC337 – a small signal NPN Silicon AF medium power ...

Reports of Apple facing difficulties in embedding the Touch ID sensor beneath the smartphone's display has surfaced frequently. A new leak suggests that Apple may incorporate the Touch ID module on ...