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This  Emergency lighting using white LEDs Circuit Diagram should be assembled only by experienced people and it is advisable to use a protection network, which can be a light bulb in series. For anyone who is thinking of making a system of emergency lighting and simple, this circuit is a cheap and functional output. The circuit is basically composed of a source AC / DC without a transformer, a charger, a system of automatic switching using a diode and a diode switch to change the brightness.  Emergency lighting using white LEDs Circuit Diagram List of Components R1 = 1M, ¼ Watt, 5% R2 = 10K, ¼ Watt, 5% R3 = 10 Ohms 1Watt All resistors are LED = 22 Ohms, ¼ Watt C1 = 205/400V, PPC C2 = 100uF, 25V Z1 = 9 V, 1 WATT T1 = BD 140 All diodes = 1N4007 BATTERY = 6 volts 4 AH LEDS = WHITE, HIGH EFFICIENCY, 5mm

The series of emergency lights on this one is a series of emergency lighting is quite simple and not difficult to make.  Frankly this circuit is not my own design, but at least this series can add to your collection of electronic circuits. The circuit is actually almost the same as the battery charger circuit, it's just that in this emergency coupled switching circuit as a circuit breaker when the circuit load is connected to the supply voltage of 220 volts or in other words on the charging position. Meanwhile, when the voltage of 220 volts is lost (PLN lights off), then automatically switches the load switching circuit and turn on emergency lights, where the supply that is used is derived from batteries that have been installed in stand-by position. In a series of emergencies over the use of LED as a lighting load emergency. And indeed these days we find a lot of emergency lights that are sold in the market that use LEDs, but the LED is used instead led carelessly but has led a gl...