Elenco Electronics 202 - Manual (Page 68)

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Project #146
OBJECTIVE: To make different sounds.
Whining Fan
Project #147
Light Whining
OBJECTIVE: To make different sounds.
Replace the 100 Ω resistor (R1) at the upper-
left of the circuit (points A1 & A3 on the base
grid) with the photoresistor (RP), and wave
your hand over it. The whining sound has
changed a little and can now be controlled by
light.
Project #148
More Light
Whining
OBJECTIVE: To make different sounds.
Replace the 0.02 μF capacitor (C1) with the
0.1 μF capacitor (C2). The sounds are lower
in frequency and you can’t make the fan spin
now.
Project #149
Motor That
Won’t Start
OBJECTIVE: To make different sounds.
Replace the 0.1 μF capacitor (C2) with the
10 μF capacitor (C3), put the positive (+) side
towards the left. It now makes clicking
sounds and the fan moves only in small
bursts, like a motor (M1) that won’t start.
Build the circuit on the left. Turn on the slide switch (S1) and move the
setting on the adjustable resistor (RV) across its range. You hear a
high-pitch whine and the fan spins.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.
!
WARNING: Moving parts.
Do not touch the fan or motor
during operation.