Reed Switch; Magnet Controlled Sound; Magnet Controlled Motor; An Optical Illusion - Elenco Electronics SC3DMEG Instruction Manual

Project 23
Project 26

Reed Switch

Build the circuit, and hold the magnet next to the reed
switch (S9) to turn on the color2 LED (D12). Move the
magnet around to turn the switch and LED on and off.
If you listen closely you may hear the reed switch
turning on or off. You can replace the color2 LED with
the lamp (L4) or the other LEDs (D9 or D11).
The reed switch (S9) is an electrical
switch that can be controlled by a
magnet. It has two metal contacts
close together. The magnetic field
from the magnet makes the contacts
come together, completing a circuit
just like a switch does. If you look at
the reed switch contacts with a
magnifying glass then you may be
able to see them move slightly when
the magnet turns the reed switch on
and off.

An Optical Illusion

Build the circuit, and place one of the illusion
cards in the illusion card holder, and place it
on the clear motor (M4). Turn on the slide
switch (S1), then push the press switch
(S2). The motor should be spinning the
illusion card, making the pictures on each
side appear to blend together.
The motor speed will vary a little depending
on the color of the color2 LED (D12) light.
Push the press switch again if you want to
speed up the motor.
If the illusion card comes out at high speed
then insert a small piece of paper into the
cardholder with the illusion card to make it
fit more snugly. see on page 6.
Project 24
Magnet Controlled
Sound
Project 25
Magnet Controlled
Motor
Use the preceding circuit but replace the melody IC (U32)
with the clear motor (M4) with green fan, or the orange
motor (M9, use a 1-snap wire to support its 3rd snap) with
the mirror ball. Use the magnet to activate the reed switch
and spin the motor.
Project 27
More Optical
Illusions
Use the preceding circuit but try
the other 3 illusion cards. Also
try replacing the color2 LED
(D12) with the blink red LED
(D11) for different effects. If you
have a color LED (D8) from
another Snap Circuits® set,
then you can use it in place of
the LED in this circuit. D8
changes the motor speed in
bursts, giving some different
effects.
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