Project 96
Music Alarm
Combo
Build the circuit shown
and then place the
alarm IC (U2) directly
over the music IC (U1),
resting on the three 1-
snaps. Turn on the
slide switch (S1) and
you will hear a siren
and music together.
After a few seconds,
covering
the
phototransistor (Q4)
will stop the music (but
the siren continues).
Turn the slide switch
(S1) on and you hear
the sound of a bomb
dropping and then
exploding. The color
LED (D8) lights and
then flashes as the
bomb explodes. This
is
one
sound
generated from the
space war IC (U3).
-42-
Hit the Target
Project 97
Project 98
Build the circuit shown,
including the jumper
wires going between it
and the cup of water
shown. There will be
sound when you push
the press switch (S2) or
when the jumper wires
are in the water.
Pushing the press
swtich or placing the
jumper wires out and
then back in into the
water will change the
sound played.
Water Space War
Project 100
Use the proceeding circuit. Replace the speaker (SP2)
with the color LED (D8, “+” to top). Putting the jumper wires
in the water OR pressing the press switch (S2) will cause
the LED to be bright.
Project 99
Light/Water Space War
Use the proceeding circuit. Replace the color LED (D8) with the
2.5V lamp (L1). Putting the jumper wires in the water OR pressing
the press switch (S2) will cause the lamp to be dimly lit. Putting
the jumper wires in the water AND pressing the press switch at
the same time will cause the lamp to be much brighter.
OR/AND Space War Light
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