Tuesday, August 9, 2016

Simple 220v emergency LED light

This circuit is an emergency lamp that charge the battery by 220v electric line and when the power cut, run the LED lamp automatically.
The battery used in this circuit is a 3.7v Li-ion battery 2000mAH. charging current in this circuit is about 50mA, this current is good for slow charging since this circuit is an emergency lamp so it leaves under charging for a long time to charge the battery so high charging current maybe decrease the battery life.
The circuit is simple as possible and very helpful. 
You can use any other PNP transistor rather than S9012.

Parts list:
Transistor S9012
Li-ion 3.7v battery 1000 to 3000mAH(18650)
Resistor 270 ohm 2W
Resistor 1K
Resistor 5 ohm 2W
Capacitor 820nF 400v
Capacitor 470uF 16v
Diode bridge 1A or 4 x 1N4007
Zener diode 4.8v 1W
Diode 1N4007
White LED(24 pcs or more)


Simple 220v emergency  LED light

Simple 220v emergency  LED light