Elenco Electronics 202 - Manual (Page 92)

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Project #215
OBJECTIVE: To build a circuit that uses a programmed sound
IC.
Build the circuit shown on the left, which uses the space war integrated
circuit (U3). Turn the slide switch (S1) on. A space war sound plays,
and the LED (D1) flashes. If there is no light on the photoresistor (RP)
then the sound will stop after a while.
You also make sounds by pressing the press switch (S2). See how
many sounds are programmed into the space war sound IC.
Space War Sounds
with LED
Project #214
OBJECTIVE: To build an LED fan rotation indicator.
Place the fan onto the motor (M1). Turn the slide switch (S1) on. The
fan rotates clockwise, the green LED (D2) and the lamp light (L2).
When you connect the positive (+) side of the battery (B1) to the
positive (+) side of the motor, it spins clockwise. Turn the switch off
and press the press switch (S2). Now the fan spins the other way and
the red LED (D1) and lamp light. The positive (+) side of the battery is
connected to the negative (–) side of the motor. The polarity on the
motor determines which way it rotates. Notice that the lamp lights in
both polarities.
LED Fan Rotation
Indicator
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.