Power failure is a period of time when the electricity supply to a particular building or area is interrupted, for example because of damage to the cables or any other reason, and Power restoration is a period of time when the electricity supply to a particular building or area is restored, for example because of replacement or servicing damage to the cables or any other reason. This device gives audio-visual indication of the failure and resumption of mains power. The circuit is built around dual timer IC LM556. When mains is present the bicolour LED glows in green colour, and when mains fails it turns red.
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RELATED WORKS
1. DESIGN AND CONSTRUCTION OF A POWER SUPPLY RESTORATION ALARM WITH 555 TIMER, BUZZER AND LED
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4. DESIGN AND CONSTRUCTION OF A POWER FAILURE AND RESUMPTION ALARM
5. DESIGN AND CONSTRUCTION OF A POWER RESUMPTION ALARM AND LOW-VOLTAGE PROTECTOR
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