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32
Project 51
This is the same circuit as project 1, but you will view it differently. Turn on
the switch (S1), and view the LED through the prismatic lm (the clear slide).
Prismatic lm makes interesting light effects.
Replace the color LED (D8) with the white LED (D6) and red LED (D1); view
them through the prismatic lm.
View different light sources in and around your home through the
prismatic lm.
Project 52 Look at the Lights
Use the project 51 circuit, but view the color LED through various semi-
transparent liquids, glassware, and plastics. Juices, jello, and cloudy
glass or plastic work well.
Replace the color LED with the white LED (D6). The white LED is
brighter, but does not change color.
Project 53 Scattering Light
Prismatic lm separates light into
different colors. White light is a
combination of all colors.
Semi-transparent materials scatter the
light without completely blocking it, so
a wide area of the liquid or material is
lit up by the light. This happens in the
egg and tower LED attachments.
Use the circuit from project 51, but place the clear cable holder on the
color LED (D8), then place the ber optic cable into the holder as far as
it will go. Turn on the switch, then take the circuit into a dimly lit room
and see the light coming out the open end of the cable. The light travels
through the cable even as you bend it around.
Project 54 Color Fiber Light
Project 55
Blinking Beeping
Build the circuit as shown and turn on the switch (S1). The color LED (D8) will be
blinking and you hear beeping from the speaker. The sound will not be very loud.
The color LED (D8) has a
microcircuit that changes the
light colors. As it does this, it
changes the current through
the circuit. The transistor
(Q2) amplies the changing
current and uses it to control
the speaker (SP).
Use the preceding circuit, but replace the speaker with the red LED (D1).
Now the red LED will also be blinking.
Project 56 Blinking Blinking
Prismatic Film
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