Emergency Light using Phone Line Circuit Diagram

This is a circuit for emergency lighting with LEDs that uses electricity from the telephone line. Generally the phone line has a DC voltage 48V and somewhere around 20 mA, and when the phone rings, the voltage rises to 96V AC. This works in a way that the phone line will not be busy while the LEDs are turned on and when you pick up the phone, the light goes off and lets you use your phone normally.

 Emergency Light using Phone Line Circuit Diagram