Data Sheet

Project 28 Funky Blinking Lights
Build the circuit and turn on the slide switch
(S1). The LEDs (D11 & D12) are blinking.
Notice that when the blink red LED (D11) is on,
the brightness of the color2 LED (D12) is lower,
because the voltage from the batteries is
divided between the two LEDs. When the blink
red LED is off, the color2 LED gets the full
battery voltage, and gets brighter.
Project 29
Use the preceding circuit
but replace the color2 LED
(D12) with the melody IC
(U32, “+” on left).
Project 31 Variable Speed Fan
Build the circuit, place the wind fan on the motor
(M4), and turn on the slide switch (S1). The fan
speed varies a little depending on the color of the
color2 LED (D12). If the fan does not start spinning
then give it a push.
The clear motor (M4) and color2 LED (D12) are connected
in series, so the voltage from the batteries is divided
between them. The electricity used by the color2 LED
varies a little depending on the color of light it is producing.
When the color2 LED uses more electricity, there is less
electricity for the motor, and the motor slows down.
Project 32
Use the preceding circuit but replace
the color2 LED (D12) with the blue
(D9) or the blink red LED (D11).
The clear motor (M4) does not spin at full
speed because the LED is connected in
series with it. With the blink red LED, the
motor speeds up a little when the LED is
off, but it is hard to see the difference.
Project 30
Use the preceding circuit
but replace the blink red
LED (D11) with the color2
LED (D12). The sound will
vary depending on the
color of the color2 LED,
but will not be very loud
and sometimes there may
be no sound at all.
Funky Sounds
Low Funky
Sounds
New Speed Fan
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SC-3DMEG_Manual.qxp_SC-3Di_Manual_060816 6/19/17 7:30 PM Page 26