Elenco Electronics 202 - Manual (Page 24)

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Project #17
OBJECTIVE: To show how an integrated circuit can be used to
make real alarm sounds.
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.
When you turn on the slide switch (S1), the integrated circuit (U2)
should start sounding a very loud alarm sound. This integrated circuit
is designed to sweep through all the frequencies so even hard of
hearing people can be warned by the alarm.
If the alarm sound was passed through an amplifier and installed into
a police car, it would also serve as a good police siren.
Alarm Circuit
Project #18
OBJECTIVE: To show how integrated circuits sound can easily
be changed to exciting space war sounds.
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.
When you turn on the slide switch (S1), the integrated circuit (U2)
should start sounding a laser gun sound. This integrated circuit is
designed to produce different sounds that can easily be changed. You
can even switch the sound on and off quickly to add sound effects to
your games or recordings.
Laser Gun