How digital clock works ???

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Fazlay Rabbi

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as i hv seen , if i turn off the power of a digital clock & after few time i turn on
then the time doesn't goes to it's default value/ or any thing other ....it just show the correct time ................Whats the mechanism behind it ??
 

Battery backup is another option. I had one like that a long time ago, it was a real lifesaver if the power went out overnight.
 

if i use battery back up then i need to use such a back up that dont need to charge frequently
 

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