Project 48
Shine On Siren
Project 49
Shooting
Sounds
Project 50
Song &
Siren
Project 52
Static Song
Project 51
Ambulance
Melody
This circuit demonstrates how
sounds can be synchronized
to light patterns through the
photoresistor.
Cover the phototransistor (Q4) and turn on the switch (S1). A police
siren is heard for a while and stops, then you can control it by covering
or uncovering the photoresistor.
Now remove the connections
between A & D and between
Y &B, then make a connection
between X & A. The circuit
works the same way but now
it sounds like a familiar song
but with static.
A
B
C
D
Use the preceding circuit,
but add a connection
between
the
points
marked B & C using a 1-
snap and a 2-snap. Now it
sounds like a machine
gun.
Use the preceding circuit,
but remove the connection
between B & C, and add a
connection between A &
B. Now it sounds like a fire
engine
Use the preceding circuit,
but remove the connection
between A & B, and add a
connection between A &
D. Now it sounds like a
European siren.
x
Y
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