Many bathrooms are fitted with a fan to vent  excess humidity while someone is showering. This fan can be connected to the light  switc...

This is a simple call bell circuit that displays a welcome message when somebody presses the call bell switch momentarily. the alphan...

This wireless baby monitor circuit using FM is designed to operate at a frequency of  100MHzefy tested. Its range of transmission is more ...

This is the Simple Dog Whistle for Ronja Circuit Diagram. Ronja is the author’s dog, a beagle-mongrel,  who seems increasingly often to...

Normally, the level of a liquid in a container is determined by sensing changes in the capacitance or resistance between a pair of el...