Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 115)

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Sound is a variation in air pressure created by a mechanical
vibration. For a demonstration of this, take a stereo speaker in
your home (the larger the better), lay it on the floor, and start
some music.
1. Place your hand on your
stereo speaker and turn up
the volume. Do you feel the
speaker vibrate?
2. Now place a piece of paper
on the speaker; if the sound is
loud enough, you will see the
paper vibrate.
3. Take a balloon (not included) and hold
it on the speaker. You should feel it
vibrating with the sound.
4. Get your parents’ permission for this part,
because it could get messy. Place the
sound energy demonstration container
(which should have been assembled as
per instructions on page 4) on the center
of the speaker. Pour some salt, glitter,
small foam or candy balls (0.1 inch
diameter or less) or similar into the
container, but not enough to cover the
bottom. Slowly increase the music
volume. When the music is at certain
frequencies, the salt/glitter/balls will
bounce around in the container.
Stereo Speaker (not included)
If you have a stereo speaker (not included), then
you can also do the preceding demonstration
using the sounds from your keyboard (U26). Build
the circuit as shown, and connect your stereo
speaker to it. Start with the left slide switch (S1)
turned off and the right switch turned on. Press
keys to find the one that gives the best effects with
the 3 experiments in the preceding project, then
turn the tune knob on the keyboard to see if you
can make the effects even better.
Now turn on the left slide switch to add the
photoresistor (RP) to the circuit. Move your hand
over the photoresistor to adjust how much light
shines into it, to change the sound to give the best
effects for the 3 experiments in the preceding project.
Project 235 Sound is Air Pressure
Project 236 Sound is Air Pressure -
Keyboard
Your Snap Circuits ®
speaker (SP2) is not
powerful enough to
use for this, unless
using the sound
energy demonstration
container as done in
project 196.
SCC-350_Manual_Part_C.qxp 7/25/14 2:10 PM Page 3