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124. Logical element "AND"
Assemble the circuit. To make the LED light up, you have to simulta-
neously close the switch AND the button. This is the logical element
"AND".
126. Logical element "NOT"
When the switch is turned on, the LED will NOT light up. This is the opposite of what would
usually happen-when you turn on the switch, the LED goes out. This is the logical element
"NOT".
125. Logical element "OR"
The LED will light up if you turn on the switch OR the button. This is
the logical element "OR".
127. Logical element "AND-NOT"
When the switch AND the button are on, the LED will NOT light up. This is the logical element
"AND-NOT".
128. Logical element "OR-NOT"
If the connection between the switch and the button is
changed to parallel, the LED will NOT turn on when the
switch OR the button are on. This is the logical element
"OR-NOT".
106
129. Alternating sound and light
Assemble the circuit. Connect the phototransistor
132
to the F-E terminals. Close the switch
15
(ON). If the phototransistor is lit, then from the loudspeaker you'll hear a sound that resem-
bles either shooting or laughter. If you shield the phototransistor from the light, you'll hear the
sounds of a siren. Do you know anyone who laughs like that?
130. Unknown sound
Assemble the circuit as in the diagram. Now connect the terminals F-B using the wire buttons
and wires 3. Close the switch
15
(ON). You'll hear an unknown sound. Why not come up with a
name for it?
131. Two sirens
Assemble the circuit as in the diagram. Connect the phototransistor
132
to the A-B terminals.
Close the switch
15
(ON). If the phototransistor is lit, then you can hear the sound of fire engine
sirens from the loudspeaker. If you shield the phototransistor from the light, you'll hear the
sounds of a siren.
132. Magnet-activated police sirens
Assemble the circuit as in the diagram. Replace the switch
15
with the reed switch 13, and
hold the magnet near the reed switch. You'll hear the sound of police sirens from the loudspeak-
er.
133. Magnet-activated fire engine sirens
Use the wire
3
to close the A-B terminals, and hold the magnet close to the reed switch. You'll
hear the sound of fire engine sirens from the loudspeaker.
134. Magnet-activated ambulance sirens
Remove the wire that closes the A-B terminals. Close the B-G terminals with the wires 1,
hold the magnet near the reed switch. You'll hear the sound of an ambulance sirens from the
speaker.
135. Strange laughter activated by a magnet
Remove the wire that closes the B-G terminals. Connect the F-H terminals with the wires
1
1. Use the magnet to turn on the reed switch 13. You'll hear different sounds from the that re-
semble impish laughter or light machine gun fire from star wars.
136. Laughing Buddha activated by a magnet
Remove the wires closing the F-H terminals. Use the two wire buttons
1
to connect the photot-
ransistor
132
to the B-F terminals, and hold the magnet near the reed switch 13. Change the
light of the phototransistor. You'll hear a sound coming from the loudspeaker. Some say this is the
sound of Buddha laughing.
137. Flashing magnet-activated LED
Remove the phototransistor 132. Replace the loudspeaker
20
with the LED
at the top), use the wire
3
to close the E-F terminals, and hold the magnet near the reed switch.
The LED will flash.
138. Magnet-activated flashlight
Now, replace the LED
17
with the light-bulb 18, and hold the magnet near the reed switch. The
light-bulb will start flashing.
107
2
and
2
and
17
(the "plus" is
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