“Emergency lights are very useful gadgets and are quite popular, too. During the power failure, these portable lights are able to instantly illuminate through battery back up and never allow us to stumble in the darkness. Although you will find them in the market at a very low price, building your own emergency light at home can be a totally different experience. It will not only help you to create a quality design but also will acquaint you with the technical aspects of the unit. Besides, you also get an opportunity to customize the circuit as per your own requirements.
The idea of the present emergency light circuit is that it should be compact and may be kept plugged into the mains socket for a permanent automatic operation. The light can also be charged through a solar panel when the mains is not available for a long time.
A 6V,4.5AH ld-d battery is used for backup because this type of battery perhaps the mt wdl ud t f rhgable bttr. Apart from this, lead-acid battery is very cheap and t can deliver vr hgh currents t h n xtrml low internal rtn.
Long Battery Backup ( 6V / 4.5Ah )
Light can b nntd t the power source ll tm.
Bttr rttd frm vrhrgng.
Stable nd ntnt utut voltage obtained from th charger even t lght variations.
Battery first hrgd t pre-set current (here aprox 0.45A) nd th bttr vltg increases, hrgng urrnt also decreases nd fnll bm closer t zr keeping the bttr full hrgd (trkl charging md)
1. 6V SLA Battery
2. LED Strip
3. Regulator IC LM317
4. Transistor: BD140
5. Transistor BC547
7. Zenner Diode
8. Resistor-330R , 100R ,180R , 1K
12. Strawhat LED-5mm
13. Screw Terminals
14. Heat Sink
15. PCB Standoffs
16. LED Dimmer
1. Soldering Iron
3. Clamp Meter
3. Wire Stripper