Step 1: Materials
1 - Doberman Security Toolbox Alarm ($15 Home Depot)
1 - Tennis Ball
--- I found a cheap window alarm for $1 at the dollar store, simply removed the batteries and housing from the casing.----
3 - LR44 Button cell batteries
1 - Casing for 3 LR44 batteries
-- Stand --
2 - Plastic or paper cups
Solder - for electronics
Exacto knife or razor knife
general purpose super glue (Picked up at dollar store for $1)
Clamps or device to hold in place while using the saw
saw, preferably one for cutting plastic.
Step 2: Shrink the Electronic Components
Remove plastic cap on back. It makes cutting easier.
Using the saw cut around the edge of the housing until the housing is split into two halves.
Remove the housing.
Cut the plastic edges of the electronics to make the size smaller.
Cut the battery compartment from electronics
Cut the speaker housing from electronics
Trim speaker housing until the shape is circular rather than the square shape.
After removing the existing AAA compartment by de soldering the wire leads, attach the LR44 Batteries and compartment. It is important to swap the AAA housing for the button cell housing as AAA takes too much room inside the tennis ball. As long as you have batteries that output the same voltage as before you should be ok. Removing three 1.5v AAA batteries results in needing three 1.5v button cell batteries. Use the remote to check that the device works.
Carefully bend the antenna into a smaller square shape the size of the electronic parts shape.
Step 3: Concealing Electronics Into Tennis Ball
Rearrange the electronic parts until the most compact shape is achieved. You may need to tape the back of the speaker and electronic board as to keep the wires from touching causing a short.
Place the electronics into the ball through the cut out. Then fold back the tennis flap until the original sphere shape is achieved. Place the black magnetic reed switch in position that the arrow is pointing outwards towards the outer wall. Try to place the switch that once concealed will be located directly under the outside label. This helps in identifying where the magnet has to be positioned to arm device.
Step 4: Making a Stand/case
Cut the cup in the middle.
Lay the top half of the cup upside down, wide part down.
Insert the bottom half of the cup inside the top half, bottom of cup should be with the top of the top side cup.
Tape the middle of each half together.
Insert remote and magnet inside the holder. Place the ball on top. That's it!