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This is brightness controller circuit diagram.You can use this circuit for your car or for your bike.Here I have used famous IC NE 555. Note # Use 6V bulbs with this # Build this circuit on a pcb.

This is Security alarm .If somebody disconnected the wire loop The speaker will generate a sound.I have used a circuit for my land.Then when a robber enter for my land i can know it earlier.when you setup this set the wire loop at the height of 1 feet from the ground. Note # Build this circuit on a pcb # use a thin coil as the wire loop