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Make
a Buzzer
(Buzzer
or Bell)
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| Introduction: Buzzer
or electric bell is an electromagnet that automatically connects and
disconnects many times per minute. This will cause the vibration of the
armature and creation of a buzzing sound. The sound of a buzzer in a
commercial buzzer is amplified by a small hammer hitting a bell. Before
you do this experiment, you must have successfully completed the telegraph
sounder experiment. |
Procedure:
| In the telegraph
sounder you made before, the magnetized nail will attract the long
arm or armature any time you push the key. We will now use the
same armature as a secondary key in our circuit in a way that when
the armature is pulled down, it disconnects the the circuit. This
will make the nail to lose its magnetic strength so the armature
pulls back up again. As the armature moves up, the circuit will
close again and the cycle repeats. |
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| Make
a Flipper:
To do this you must bend a bare
copper wire as shown in this image. This is called a flipper
because it automatically flips the circuit from off to on or wise
versa. (This copper wire is only available in advanced kits.
If you don't have an advanced kit, use any bare copper wire). Use
a screw to secure this wire on the board in a way that the other
end of the wire touches the top of the armature. |
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| In your telegraph
sounder, the red wire of the battery holder was connecting to the
key. In this buzzer you connect the red wire of the battery holder
to the screw of flipper. Then you also connect another wire from
the screw of armature to the key.
Now the electricity enters the
flipper, passes through the armature and then enters the key/
switch. |
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| Test
your buzzer:
Push the key to connect the
circuit. The buzzer must buzz. If it is not do some trouble
shooting as described here:
- Make sure that the flipper
wire is touching the armature when it is in up position.
- Make sure that the flipper
wire is no longer touching the armature when it is in down
position.
- Test all the connections and
secure them if necessary.
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| More
Than 10 Projects in One Kit
The advanced and standard
electromagnetism kits provide you with the opportunity of doing
more than 10 different experiments and projects related to
magnetism and electromagnetism. If you do not have the kit, please
order it now.
Order
Now |
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