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Picture of a simple door alarm
In this Instructable I will teach those of you that don't know how to make a simpledoor alarm that's also cheap.

You will need:
about 2 inches of a wide cable with no wires in it
2 ringing alarms
1 piece of cardboard [about 1X4inches]
about 1.5 feet of wire [1/2 red, 1/2 black]
1 2.7 volt capacitor [this will boost the small battery]
1 1-volt lithium battery
1 regular size paperclip
2 tiny pieces of scrap metal [you can find in alleys]

Optional:
wire tape [very handy and keeps you safe from shocks]
plastic clip [handy if wires need to be pinched together to complete the circuit]

Step 1: Let's Get Started!

''''''''''''''''''''''''''''''''''''''''''''Ready?''''''''''''''''''''''''''''''''''''''''''''''Okay now let's begin!
Start by twisting the wires on the two ringers.

 
chilll2009 (author) 5 years ago
Sorry for the suckish photos...
D: