Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 60)

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Project 84 LED Color Spectrum Project 85
LED Color
Spectrum (II)
Project 86
LED Color Spectrum (III)
Project 87
LED Color Spectrum (IV)
Project 88
LED Color
Spectrum (V)
Build the circuit as shown, and turn
on the switch (S1). The white LED
(D6) will be on. Look at the white LED
through the prismatic film to see the
color spectrum of white light, which is
all the colors of a rainbow. For best
effects, do this in a dimly lit room.
Now remove the 2-snap across
points W-W, and place it across
points C-C (the color LED), then
points R-R, G-G, and B-B (for the
color organ). Using the prismatic film,
look at the color spectrum produced
by the color LED, and the different
colors from the color organ. Compare
them to the white LED spectrum.
Use the preceding circuit, but remove the 2-snap
across points W-W and place 2-snaps across R-R
and G-G. Use the prismatic film to look at the color
spectrum. View from different directions and
different angles.
Next, move the 2-snaps to R-R and B-B, and look
at the spectrum. Then move the 2-snaps to G-G and
B-B and look at the spectrum. View from different
directions and different angles.
For each combination, the color spectrum should be
mostly light of the 2 individual colors you are
combining.
Use the preceding circuit, but place 2-snaps across points R-R, G-G,
and B-B. Use the prismatic film to look at the color spectrum. View from
different directions and different angles.
With the above connections, the color organ (U22) produces white
light. The actual color spectrum you see will vary with your viewing
angle, because the light is produced using separate red, green, and
blue LEDs next to each other.
Now remove the 2-snaps from R-R, G-G, and B-B, and place one
across W-W, so the circuit is like the project 82 drawing. Use the
prismatic film to view the color spectrum from the white LED (D6)
again, and compare it to the white light spectrum from U22. The D6
spectrum does not vary as much with the viewing angle because the
light is produced by a single LED, and it is brighter.
Use the circuit combinations from projects
82-84, but look at the different lights through
the red, green, or blue filters instead of the
prismatic film. Each filter only allows you to
see light of that color, and blocks the other
colors. If you put all three filters together
then all light is blocked.
Actually, the red filter will pass a little of the
green light, the blue filter will pass a little of
the green light, and the green filter will pass
a little of the green and blue light. This is
because green light is between red and
blue light in the color spectrum, and the
filters are not perfect. See page 13 for more
information about the color spectrum.
Repeat project 82, but
place the black fiber optic
cable holder with the fiber
optic cable on the LED you
want to view. Look at the
light coming out the other
end of the cable using the
prismatic film, and view in a
dimly lit room. The light is
not as bright but the beam
is narrower, so the color
spectrum may be clearer.
SCC-350_Manual_Part_B.qxp 7/25/14 2:05 PM Page 4