Momentary Alarm

Project Number: 16

Parts Needed For Circuit: B1, 5, SP, U1, 4, S1, 2, 2, S2, 3, 2, 2

OBJECTIVE: To show how integrated circuits can also create loud alarm sounds in case of emergencies.

Description: Modify the circuit used in Project #15 to look like the one shown on the left. 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.