Motor Sounds Combo (II)

Project Number: 85

OBJECTIVE: To connect multiple devices together.

Description: In the circuit, the outputs from the alarm and music ICs are connected together. Build the circuit shown and then place the alarm IC (U2) directly over the music IC (U1), resting on three 1-snaps. Turn on the slide switch (S1) and you will hear a siren and music together. Push the press switch (S2) and the fan spins, while the sound may not be as loud. The fan may rise into the air when you release the press switch. This circuit is similar to Project #84, but the fan will fly a little higher since the sound circuit no longer drives the lamp (L1) and therefore uses less battery power.