Elenco Electronics 202 - Manual (Page 26)

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Project #22
OBJECTIVE: To build a police siren that is controlled by light.
Build the circuit shown on the left by placing all the parts with a black
1 next to them on the board first. Then, assemble parts marked with
a 2. Finally, insert the parts with a 3 last on level 3.
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
Project #23
More Loud
Sounds
OBJECTIVE: To show
variations of the circuit in
project #22.
Project #24
More Loud
Sounds (II)
OBJECTIVE: To show
variations of the circuit in
project #22. OBJECTIVE: To show
variations of the circuit in
project #22.
Project #26
More Loud
Sounds (IV)
OBJECTIVE: To show
variations of the circuit in
project #22.
Project #25
More Loud
Sounds (III)
Modify the project #22 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 fire 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.