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16
Project #13
When you close the slide switch (S1), the music integrated circuit (U1)
may start playing one song then stop. The song will be much louder than
in the previous project because it is now being used as an alarm. Each
time you press the press switch “alarm button” (S2) after the song stops
playing, the song will play again, but only while you hold the button down.
Momentary Alarm
OBJECTIVE: To show how integrated circuits can also create
loud alarm sounds in case of emergencies.
(STANDING)
Project #14
Build the circuit shown on the left by placing all the parts with a black 1
next to them on the board rst. Then, assemble parts marked with a 2.
When you close 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 amplier and installed into a
police car, it would also serve as a good police siren.
Option A: Modify the circuit by connecting points X & Y. The circuit
works the same way but now it sounds like a machine
gun with music.
Option B: 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.
Option C: 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.
Alarm Circuit
OBJECTIVE: To show how an integrated circuit can be used to
make real alarm sounds.
(STANDING)
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