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18
Project #18
Cover the photoresistor (RP) and turn on the slide switch (S1). A police
siren with music is heard for a while and stops, then you can control it
by covering or uncovering the photoresistor.
Light Police Siren
OBJECTIVE: To build a police siren that is controlled by light.
(STANDING)
Project #19 More Loud Sounds
Project #20 More Loud Sounds (II)
Project #21 More Loud Sounds (III)
Project #22 More Loud Sounds (IV)
Modify the Project #18 by connecting points X & Y. The circuit works the
same way but now it sounds like a machine gun with music.
Now remove the connection between X & Y and then make a connection
between T & U. The circuit works the same way but now it sounds like a
re engine with music.
Now remove the connection between T & U and then make a connection
between U & Z. The circuit works the same way but now it sounds like an
ambulance with music.
Now remove the connections between U & Z and between V & W, then
make a connection between T & U. The circuit works the same way but
now it sounds like a familiar song but with static.
Blowing Off the
Electric Light
OBJECTIVE: To show how light is stimulated by sound.
Install the parts. The lamp (L2) will be on. It will be off as long as
you blow on the mic (X1). Speaking loud into the mic will change the
brightness of the lamp.
Project #23
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