I have the pleasure of living in an apartment without any ceiling lights in my bedroom or living room, and if you do as well, you know that it’s a little annoying. I have lamps everywhere that I have ...

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.

With just three transistors, one relay, and some resistors and capacitors, a single light switch can provide sophisticated control of high-power and low-power lamps. With just three transistors, one ...