i will have to built its circuit first and then how to implement it.
Do you want to build it all from scratch? if not, you can go to an electronics store (even redio shack) and get piezo beepers, buzzers, or sirens, and build a basicpiezo/switch/battery circuit.
Select as Best AnswerUndo Best Answer
Take a large cardboard box, and put a small child in it.
Tell the child that the box is a fire engine.
Record the sound made by the child.
Do you want a wailing siren that bends pitch back and forth between the two, or a pee-paw siren like in UK, where it just goes between the two sound...
or both sounds mixed together?