Homemade alarm device simple

This article will continue to look at "homemade" a simple warning device for the purpose of signaling your self-identity being compromised or . "troll" friends and relatives also well suited!

Prepare

1. 1 Square battery (used in wireless microphones).
2. 1 Battery contact head.
3. 1 Small capacity warning horn device.
4. 1 Number of long zinc bolts and several rounds.
5. 1 Cover of a ballpoint pen.
6. Silicone glue, scissors, lead groins, small wire and matchsticks.

Perform

Attach the battery and battery connection back.Then apply a layer of silicone glue to the wide plane of the battery pack.

Put the mini siren on.

Then tell the horn's power cord with the power cord of the battery connector.

And use a lead torch to bond two contact ends of the wire.

Try connecting the other end of the 2 devices to see if the buzzer is working.Do not use solder at the end of this connector.

Now remove the cap of the ballpoint pen and remove the top of the cap.Then use a saw to create a cross-section but not completely cut off.

This is the product after creating a slot by sawing.

Next use a drill to drop a small hole inside the pen cap.

Put a screw in and turn it so that the brain tip pierces the top of the ballpoint cap.

Now take the other end of the mini siren and solder it to the end of the screw that was caught in the ballpoint cap.

Now apply a layer of glue to one side of the battery and place the tip of the ballpoint cap that has soldered the wire.

Take one long bolt and bring it into the number of turns so that it covers the bolt.

Carry out the welding of the remaining wire at the end of the bolt.You can also use another piece of wire to increase the length of the wires if necessary.

The next job you need to do is to use a flexible electrical wire to cover the connections between the two ends of the wire.

When you're done, drop the long bolts on the inside of the ballpoint cap.Then the circuits will connect to each other and the siren will sound.

To disconnect the device's transmission circuit, use a piece of wood or cardboard and place it in the freeway at the ballpoint cap that we created in the first steps.

Next, put your "device" on a desk or position you want.Then use silicone glue to fix it.

Tie a small thread to the piece of cardboard.Then keep the distance so that when opening the door or the door is long enough, fear only to stretch and pull the piece of cardboard away from your alarm device.

Then attach the remaining wire end to the edge of the cabinet.

Now you just need to gently defuse the cabinet or door and wait for someone to "stick" your card!