Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...

The built-in light sensor element continually monitors the ambient ... Next, fix the aircraft light(s) in position and then connect the leads to the switch socket (SW) as indicated in the circuit ...

This is a good project - building a whistle-activated light switch. Hold a note to turn it on ... where he details the project - Whistle-activated switch - and provides circuit diagrams, C… ...