Elenco LIGHT - Manual (Page 66)

-65-
Build the circuit as shown; do not place the fan on the
motor. Set the lever on the adjustable resistor (RV)
toward the 3-snap. Turn on the switch (S1) to start the
motor (M1). If the motor does not spin, then give it a
push to get it started. Use the lever on the adjustable
resistor to control the motor speed. If the motor does
not spin even after giving it a push then replace your
batteries.
Turn off the switch and turn the motor shaft counter-
clockwise with your fingers. Now turn the switch on try
turning the motor counterclockwise; now it is harder
because the circuit is trying to turn the motor clockwise
at the same time.
Project 140 Slow Motor Speed Control
Project 141
Slow Motor Start Aid
The motor needs a lot of electricity to start
spinning, but needs less the faster it is
spinning. The resistors (R1 & RV) are
limiting how much electricity flows, so the
motor can barely spin.
Use the preceding circuit but add the 100
µ
F
capacitor (C4) directly over the 100
Ω
resistor (R1),
“+” side towards the motor. The circuit works the
same, but starts more easily.
If you have a larger 470 µ F capacitor (C5), which is
included with some other Snap Circuits ® sets, then
you can use it in place of the 100 µ F capacitor. It will
make the motor start even more easily.
You need an infrared remote control for
this project, such as any
TV/stereo/DVD remote control in your
home.
Build the circuit and turn on the switch
(S1). Point your remote control toward
the infrared module (U24) and press
any button to spin the motor (M1).
Next, remove the 100 µ F capacitor
(C4). The circuit woks the same, except
now the motor moves in small steps.
Sometimes this circuit may activate
without a remote control, due to
infrared in sunlight or some room lights.
If this happens, try moving to a darker
room.
!
WARNING: Moving parts. Do not
touch the fan or motor during operation.
Project 142 R/C Motor
The capacitor allows a short surge of
electricity to flow through it until it
charges up. This short surge bypasses
the higher resistance of the resistors,
and helps the motor get going.
Remote