Music Alarm Combo

Project Number: 86

OBJECTIVE: To combine the sounds from the music and alarm integrated circuits.

Description: Build the circuit shown and add the jumper to complete it. Turn it on and you will hear a siren and music together. Press the press switch (S2) and the siren changes to a fire engine sound. After a few seconds, covering the photoresistor (RP) will stop the music (but the siren continues). The motor (M1) is used here as a 3-snap wire and will not spin.