Ever since childhood, almost every american male has been a fan of the Batman. But you can't have the hero without the villians, right? So DC comics created fun characters such as the penguin, catwoman, bane, and of course the joker. The joker was always my favorite (and still is) so i decided to re-create his killer joy buzzer with a more "Friendly" voltage. My 9v buzzer consists of nothing more than spare parts and some cheap stuff from radioshack, so it was a relatively cheap project to make.
soldering iron w/ solder
screw driver (phillips head)
3 batterys with connectors
Note: to make this instructable i had to take apart my buzzer and then put it back together for pics, so i decided to boost the power a little bit from 1 9v to 3 9v batterys.
Step 1: Prepare the housing
To prepare the housing for the buzzer, drill a 3/8" hole in the center of the top of the box. after that drill another hole that is 1/4" big.