CellPhone Operated Toggle Switch

  Light from a mobile phone's display screen could be used to trigger a switch. When a brief (free) phone call illuminates the d...

Dark-Activated 230V Lamp

Compact circuitry using small-size parts only Can be wired in parallel to existing switches Circuit diagram: Dark-activated Lamp

Night security light

    Here is a simple circuit switches on a light around 2 hours after midnight, the time at which most of the robberies taking place.

Cellphone Operated Toggle Switch

who suggested that light from a mobile phone’s display screen could be used to trigger a switch. When a brief (free) phone call illum...

LED Automatic Day/Night Lamp

  Although the concept may look pretty familiar and common, the main feature of the circuit is its low current consumption and compactne...

Automatic Lawn Light with LDR

Circuit of a compact and true solid-state automatic lawn light is described here. The circuit can be used to switch on incandescent ga...