Elenco Upgrade Kit SC100 to SC750 - Manual (Page 25)

-24-
Project #158 Police Car Symphony
OBJECTIVE: To combine sounds
from the integrated circuits.
OBJECTIVE:
See project #160.
The preceding circuit may be too
loud, so replace the speaker (SP)
with the whistle chip (WC).
Project #161
Ambulance
Symphony (II)
OBJECTIVE:
See project #158.
Project #159
Police Car
Symphony (II)
Project #160 Ambulance Symphony
OBJECTIVE: To combine sounds
from the music, alarm, and space war
integrated circuits.
Modify the circuit from project #158 to
match the circuit shown on the left.
The only differences are the
connections around the alarm IC
(U2). It works the same way.
The preceding circuit may be too
loud, so replace the speaker (SP)
with the whistle chip (WC).
Build the circuit shown and add the two (2)
jumper wires to complete it. Note that in one
place two (2) single snaps are stacked on
top of each other. Turn it on and press the
press switch (S2) several times and wave
your hand over the photoresistor (RP) to
hear the full spectrum of sounds that this
circuit can create. Have fun!
Do you know why the antenna (A1) is used
in this circuit? It is being used as just a 3-
snap wire, because it acts like an ordinary
wire in low frequency circuits such as this.
Without it, you don’t have enough parts to
build this complex circuit.
Visit www.snapcircuits.net or page 74 to learn about more Snap Circuits ® products to add to your collection.