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EMERGENCY LIGHT Cum ADVERTISING DISPLAY BOARD
Electronics For You
|December 2023
The electronics circuit presented here serves as both an emergency light as well as an advertising display board. It relies on a 12-volt, 1.3Ah DC battery for power backup, ensuring more than two hours of illumination after a mains power outage.
Fig. 1 displays the author's fully assembled prototype of the emergency light cum advertising display board featuring the alphabets 'V' and 'J'
Circuit and its working
The circuit diagram of the emergency light cum advertising display board is shown in Fig. 2. It comprises transformer X1, 12V voltage regulator LM7812 (IC1), timer NE555 (IC2), NPN transistor SL100 (T1), a 12V SPDT relay, and some other components. The transformer and bridge rectifier recharge the battery directly when mains 230V AC is connected across CON1.
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