A simple circuit which provides Audio Visual Indication when the AC supply resumes/fails. This is important as when the users gets informed about the power failure , he/she can judiciously use the supply from the inverter so that they are not affected due to excessive drain of battery.The heart of the Power Failure and Resumption Alarm circuit is the dual timer IC LM556. When mains is present, the bi-colour LED (LED1) glows in green colour while when the mains fails it turns red.
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