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.
This story is from the December 2023 edition of Electronics For You.
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This story is from the December 2023 edition of Electronics For You.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
Already a subscriber? Sign In
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