Elenco Circuit Maker Skill Builder 125 - Manual (Page 14)

Project #4 Space War
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Project #5
Loud in Light
Project #6
Paper Player
The Space War, Alarm, and Music ICs contain
specialized ICs combined with other electrical
components (resistors, capacitors, transistors)
designed to produce various cool sounds and music.
The photoresistor contains material that changes its
resistance when it is exposed to light; as it gets more
light, the resistance of the photoresistor decreases.
Parts like this are used in a number of ways that affect
our lives. For example, you may have streetlights in
your neighborhood that turn on when it starts getting
dark and turn off in the morning.
Build the circuit shown on the left, which uses the space war integrated
circuit. Activate it by flipping the slide switch (S1) or pressing the press
switch (S2), do both several times and in combination. You will hear an
exciting range of sounds, as if a space war is raging!
The space war IC (U3) is a super-miniaturized electronic circuit that
can play a variety of cool sounds stored in it by using just a few extra
components.
In movie studios, technicians are paid to insert these sounds at the
precise instant a gun is fired. Try making your sound occur at the same
time an object hits the floor. It is not as easy as it sounds.
Use the circuit from Project #4 above, but replace the slide switch (S1)
with the photoresistor (RP). The circuit immediately makes noise. Try
turning it off. If you experiment, then you can see that the only ways to
turn it off are to cover the photoresistor, or to turn off the lights in the room
(if the room is dark). Since light is used to turn on the circuit, you might
say it is a “light switch”.
Use the same circuit as for Project #5. Find a piece of white paper that
has a lot of large black or dark areas on it, and slowly slide it over the
photosensitive resistor. You may need to shine a flashlight over the paper.
You should hear the sound pattern constantly changing, as the white and
dark areas of the paper control the light to the photosensitive resistance.
You can also try the pattern below or something similar to it.
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