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159. Mixed sounds
Assemble the circuit. Turn on the switch 15. You'll hear a mixed sound of music and sirens from
the loudspeaker. When the sound stops (about 15 seconds), clap your hands loudly in front of the
piezo buzzer
1 1
or blow at it with all your force, and once again you'll hear sounds. Connect ter-
minals E and F and you'll hear a birthday song from the military.
160. Electric motor – loudspeaker
20
with the electric motor 24. Close the switch
15
Replace the loudspeaker
(ON). You will hear
a combination of music and sirens from an electric motor – not as loud as from a speaker, but you
will definitely hear it! If the engine starts turning, stop it. When the sound stops, say something
11
out loud, clap your hands in front of the piezo buzzer
or blow on it with all your might, and
you'll again hear the sounds.
161. Loudspeaker – microphone
Replace the electric motor
24
with the LED
17
(the "plus" is on the right), and the piezo buzz-
er
11
with the loudspeaker 20. Close the switch
15
(ON). The LED will light up. When it goes
out (in about 15 seconds), say something out loud or really blow into the speaker. If you have
trouble speaking loud enough, then just tap the loudspeaker with your finger and the LED will
light up. In this case, the loudspeaker works like a microphone.
162. Electric motor – switch
2
0 w ith the electric motor
2
4. Close the switch
15
Replace the loudspeaker
(ON). The LED will light
up. When it goes out (in about 15 seconds), just turn the motor shaft and the LED will light up
again. Replace the LED
17
to the loudspeaker
20
and repeat the experiment. Close the A-B ter-
minals, and repeat the experiment.
163. Manually-activated intermittent sounds of machine gun fire and music
11
with the button 14. Use the
Assemble the circuit as in the diagram. Replace the piezo buzzer
wires to connect the E-F terminals. Now you can use the button to activate the sounds again.
164. Manually-activated fire engine sirens with music
Open the E-F terminals, and close the A-B terminal. Now you can hear the sounds of the fire
engine and music. As if a fireman is responding to an emergency on his birthday. This can hap-
pen.
165. Manually-activated ambulance sirens with music
Open the A-B terminals, and close the B-G terminals. Now you can hear the sounds of the ambu-
lance and music. This, too, can happen.
166. Magnet-activated sirens with music
Open the B-G terminals. Connect the reed switch
13
to the A-B terminals. Close the switch
(ON). Use the magnet to turn the reed switch on and off – the sound of the sirens will change.
14
The button
activates the sounds again.
167. Magnet-activated alternating sounds with music
13
15
Now connect the reed switch
to the E-F terminals. Close the switch
net to turn the reed switch on and off – the sound of the sirens will change. The button
vates the sounds again.
168. Magnet-activated cacophony
13
Now, using the two wires-buttons 1, connect the reed switch
to the B-F terminals. Close the
switch
15
(ON). Use the magnet to turn the reed switch on and off with a magnet – you'll hear
some real cacophony. The button
14
activates the sounds again. By the way, cacophony is the
Greek word for "bad sound".
169. Magnet-activated gunfire and with music
13
2
and 1, close the B-G
Now connect the reed switch
to the E-F terminals. Using the wires
terminals. Close the switch
15
(ON). Use the magnet to turn the reed switch on and off – the
sound of the sirens will change. The button
14
activates the sounds again.
110
170. Manually-activated flashing LED
15
Assemble the circuit. Close the switch
15
(ON). After the LED stops blinking, loudly clap your
hands or tap your finger on the piezo buzzer 11. Replace the piezo buzzer with the button 14.
Now you can use a button to turn on the LED.
171. Flashing magnet-activated LED
(ON). Use the mag-
14
acti-
14
with the reed switch 13. Close the switch
Now replace the button
blink and then go out. If you use the magnet to close and open the reed switch, the LED will again
blink.
172. Manually-activated flashlight
Assemble the circuit as in the diagram. Replace the LED
steps from project 170.
173. Magnet-activated flashlight
Replace the button
14
with the reed switch 13. When the light-bulb
15
(ON), and the LED will
gnet to close and open the reed switch, and the light-bulb will again blink.
111
17
with the light-bulb 18. Repeat the
18
turns off, use the ma-
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