Alarm Circuit

Project Number: 17

Parts Needed For Circuit: B1, 5, SP, U2, 4, S1, 2, 2, 3, 2, 2

OBJECTIVE: To show how an integrated circuit can be used to make real alarm sounds.

Description: 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 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 amplifier and installed into a police car, it would also serve as a good police siren.