This is the basic theory of a electric bell.I think this so useful thing for you all.you can do changes when you make this circuit such as changing the turns of coil,Changing the power of this circuit etc.fix this on a wooden board. There should be a touch between A & B.enjoy this
Note
# give 6v power for this circuit
# Use thin coil for this
# Turn your coil around a nail but befor start to turn cover nail with a paper.
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