Elenco Projects 102-305 - Manual (Page 31)

-30-
Project #180
OBJECTIVE: To have an adjustable
resistance control a fan and sounds.
Screaming Fan
Project #182
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 #183
More Light
Whining
OBJECTIVE: To make different sounds.
Replace the 0.02 μ F capacitor (C1) with the
0.1 μ F capacitor (C2). The sounds are lower
in frequency and you can’t make the fan spin
now.
Project #184
Motor That
Won’t Start
OBJECTIVE: To make different sounds.
Replace the 0.1 μ F capacitor (C2) with the
10 μ F 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 that won’t start.
Project #181
Whining Fan
OBJECTIVE: To make different sounds.
Replace the 0.1 μ F capacitor (C2) with the
0.02 μ F capacitor (C1). The sounds are now a
high-pitch whine and the motor (M1) starts a
little sooner.
Build the circuit on the left and place the
fan onto the motor (M1). Turn on the slide
switch (S1) and move the setting on the
adjustable resistor (RV) across its range.
You hear screaming sounds and the fan
spins.
!
WARNING: Moving parts. Do not
touch the fan or motor during
operation. Do not lean over the
motor.
To learn more about how circuits work, visit www.snapcircuits.net or page 74 to find out about our Student Guides.