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15
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Project #11
Build the circuit shown on the left by placing all the parts with a black
1 next to them on the board rst. Then, assemble parts marked with a
2. Finally, add the 2-snap wires that are marked for level three.
When you close the slide switch (S1), current ows from the batteries
through the slide switch (S1), motor (M1), the lamp (L1), and back to
the battery (B1). When the press switch (S2) is closed, the lamp is
shorted and motor speed increases.
The principle of removing resistance to increase motor speeds is only
one way of changing the speed of the motor. Commercial fans do not
use this method because it would produce heat in the resistor and
fans are used to cool circuits by moving air over them. Commercial
fans change the amount of voltage that is applied to the motor using a
transformer or other electronic device.
Two-Speed Fan
OBJECTIVE: To show how switches can increase or decrease
the speed of an electric fan.
+
Project #12
Build the circuit shown on the left. When you close the slide switch
(S1), the music integrated circuit (U1) may start playing one song then
stop. Each time you press the press switch “doorbell button” (S2) the
song will play again and stop. Even if you let go of the press switch
(S2), the integrated circuit keeps the song playing until it has reached
the end of the song.
Musical integrated circuits are used to entertain young children
in many of the toys and chairs made to hold infants. If the music
is replaced with words, the child can also learn while they are
entertained. Because of great advances in miniaturization, many songs
are stored in a circuit no bigger than a pinhead.
Musical Doorbell
OBJECTIVE: To show how an integrated circuit can be used as
a musical doorbell.
(STANDING)
These are single
snaps, placed beneath
other parts as spacers
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