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139. Police sirens with light
Assemble the circuit. Close the switch
15
(ON), police sirens will sound and the lightbulb will
light up.
140. Machine gun fire with flashes
Use the wire
3
to connect the C-D terminals, and you'll hear machine gun fire.
141. Fire engine sirens with light
3
Assemble the circuit as in the diagram. Use the wire
to connect the A-B terminals. The fire en-
gine sirens will sound, and the light-bulb will light up.
142. Ambulance sirens with light
Open the A-B terminals. Use wires
2
and
1
to connect the B-E terminals. The ambulance sirens
will sound.
143. Magnet-activated police sirens
Assemble the circuit as in the diagram. Replace the switch 15 with the reed switch
the magnet near the reed switch. You will hear police sirens, and the light-bulb will light up.
144. Magnet-activated machine gun fire with light
Use the wire
3
to connect the C-D terminals. You can use the magnet to activate the sound of
machine-gun fire.
145. Magnet activated fire engine sirens
Open the C-D terminals. Use the wire
3
to connect the A-B terminals. You can use a magnet to
activate the fire engine sirens and light-bulb.
146. Magnet-activated ambulance sirens with flashes
Open the A-B terminals. Use the wires
2
and
1
to connect the B-E terminals. Now, when the light
is on, you can use a magnet to activate the sound of the ambulance sirens.
147. Light-activated police siren
Assemble the circuit as in the diagram. Replace the light-bulb 18 with the phototransistor 132,
15
and close the switch
(ON). You'll hear police car sirens – the brighter the phototransistor, the
louder the siren.
148. Light-activated machine gun fire
Use the wire
3
to connect the C-D terminals, and close the switch
of machine gun fire. The light controls the sound.
149. Light-activated fire engine siren
Open the C-D terminals. Use wire
3
to connect the A-B terminals, and close the switch
You'll hear the sound of the fire engine. The light controls the sound.
13
and hold
150. Light-activated ambulance siren
Open the A-B terminals. Connect the wires
2
and
1
to the B-E terminal, and close the switch
(ON). You'll hear sound of the ambulance siren. The light controls the sound.
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151. Manually controlled quiet sounds of star wars with flashes
Assemble the circuit. Alternately close the switch
the sounds of different weapons and the LED
152. Magnet-activated quiet sounds of star wars with flashes
15
(ON). You'll hear the sound
14
with the reed switch 13. Now you can use a magnet to activate the
Replace the button
sounds of star wars.
153. Light-activated quiet sounds of star wars with flashes
15
(ON).
Assemble the circuit as in the diagram. Replace the switch
and use one hand to shield the phototransistor from the light while pressing the button
your other hand. You'll hear a wealth of sounds.
15
154. Touch-controlled quiet sounds of star wars with flashes
Replace the button
14
with the touch plate 12. Now, by touching the touch plate with your
hand, you can hear a wealth of sounds.
Never stare at burning light-bulbs and LEDs for very long!
155. Manually controlled loud sounds of star wars with flashes
15
and the button 14; each time you'll hear
Repeat the steps in project 151, but remove the light-bulb 18. The sound you hear should be
17
will flash. The light-bulb
18
won't be lit.
louder than in project 151.
156. Magnet-activated loud sounds of star wars with flashes
Repeat the steps in project 152, but remove the light-bulb 18. The sound you hear should be
louder than in project 152.
157. Light-activated loud sounds of star wars with flashes
15
with the phototransistor
132
,
Repeat the steps in project 153, but remove the light-bulb 18. The sound you hear should be
14
with
louder than in project 153.
158. Touch-controlled loud sounds of star wars with flashes
Repeat the steps in project 154, but remove the light-bulb 18. The sound you hear should be
louder than in project 154.
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