Multi-Speed Light Fan
!
WARNING:
Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Turn on the slide switch (S1). Push the press switch and cover/uncover
the photottransistor (Q4) to light the color LED (D8) and make the motor
(M1) and fan spin at different speeds. The motor also produces sound.
Project 109
Light Disrupter
The motor produces electrical “noise” as it
spins, which can confuse the color-changing
circuit in the color LED. The lamp is just a
simple light bulb, and is not affected by the
Turn on the slide switch (S1); the lamp (L1) and color LED (D8)
are on. Notice how the color LED is changing colors.
Now push the press switch (S2) to spin the motor and glow fan.
Notice how the color LED color pattern has changed. You can try
this with or without the glow fan on the motor.
!
WARNING:
Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
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Project 108
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