The circuit above is an light sensitive automatic switch which functions in absence of light. The IC 4060 works as an oscillator and the generated signal is applied to the base of T4 transistor.

This automatic bathroom fan controller circuit design is a lamp and fan motor control with a delayed switch off. This automatic fan control is commonly used in toilet and bathrooms. When switch S1 is ...

Electronic HID (high intensity discharge lamp) ballasts: how they work, how to control them, and develop an electronic ballast solution for outdoor lighting applications. Hbrightness metal halide ...