Introduction: "Trip Wire Alarm" for Annoying Sister Types
An alarm featuring a small electric motor that produces a high pitched whine
Step 1: Gather Yer Parts
To make a long story short my dog chewed up this plastic helicopter that went to this clever toy my dad brought home from some company at work. At any rate this toy featured an adjustable base wth a one of those DC electric motors inside. The motor in turn turned the helicopers rotor and when the switch was released, made the copter fly into the air. A any rate that's what I used to make the obnoxious alarm sound (ie: the copper coils and magnets grinding together in the motor). If you have this toy and coinicidentally you have the same predicament as I did, assemble your alarm as shown. If not, a sturdy piece of card board with a DC motor taped on top should suffice. Along with that you'll need two double A batteries, some wire if you are not making yours out of the the heli copter toy, kite string, duct tape, a glue gun, and a 50 cent D-CON mouse trap.
Step 2: Making the Alarm
Have your glue gun handy, you'll need it. First open up the base with a small screw driver. Discard the top piece of the base and the helicopter if you haven't already. Take the circular piece containing the motor and hot glue it between the two screw holes. Remove white button and in its place, hot glue the mouse trap. The negetive output should go on the spring and the positive imput, hopefully with the metal piece still attached should be glued where the bait goes. When the trap is in the down position the motor should be blaring away to the discomfort of one's ear drums. Use a piece of duct tape with a string atached to act as an insulator between the trap and the positive imput wire. When the string is pulled the alarm will sound. Duct tape on back, place agaist a wall and stretch your trip wire across a door way. Then wait for an unsuspecting intruder. Enjoy!
W/o toy : Knowing this you probably can make a makeshift one. Please post your findings as this is a collaborative effort!
Step 3: Movie!
Here is a movie of what happens and what it sounds like. I'm going to probably post one with the trip wire in real action but for now, enjoy!