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to turn off a switch automatically after a required time

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immadi.jagadish

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i connected my mobile for charging to a switch and
i want to off the switch at my required time by setting the time in advance.
what components i require for this if any body have circuit for this please post that.
thank you
 

you can use monostale multivibrator.as a timer
 

i want a display for time. why don't i use microcontroller
 

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