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Project #158 Police Car Symphony
OBJECTIVE: To combine
sounds from the integrated
OBJECTIVE:
The preceding circuit may be too
loud, so replace the speaker (SP)
with the whistle chip (WC).
Project #161
Ambulance
Symphony (II)
OBJECTIVE:
Project #159
Police Car
Symphony (II)
Project #160
Ambulance Symphony
OBJECTIVE:
To combine
sounds from the music, alarm,
Modify the circuit from Project 158 to
match the circuit shown on the left.
The only differences are the
connections around the alarm IC. 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 photosensitive resistor
(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.
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