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A Doppler ball is essentially a sponge ball with a buzzer inside
of it. It is very simple to build your own Doppler ball. It should
only cost a few dollars.
You'll need some sort
of sponge ball. You can get a buzzer and battery holder from your
local Radio Shack.
- Cut a hole in the
ball.
- Connect the battery
holder to the buzzer and place them in the sponge ball.
- When you are ready
to use the doppler ball insert a battery and remove it when you
are done.
Close
this window when you are finished
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