Light Switch Series With Photo Transistor

Light switches can be made from beberpa kinds of light sensors. Following a series of light switches are made using a photo transistor light...

Smart Phone Light Circuit Diagram

The circuit shown here is used to switch on a lamp when the tele- phone rings, if the ambient light is insufficient. The circuit uses only t...

Push Bike Light

Automatic switch-on when it gets dark, 6V or 3V battery operation   This design was primarily intended to allow automatic switch-on of push-...