summer project

Thread Starter


Joined May 22, 2009
hi,i'm a second year engineering student in electronics and i need a circuit such that it provides power to the device to which it is connected after a time delay when the power goes off i.e. it should work when there is no power supply,and such a circuit can be used in refrigerator,i've tried many of my ideas but none of them is working properly,plz someone help...:confused:....its really an urgent!!


Joined Aug 24, 2008
Are you speeking of an emergency backup supply that automatically comes on when the main supply goes dead? And this is in a cold place? Why the time delay? How much delay do you require?