Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 100)

-99-
Tube
Flexible sheet
Container base
Speaker
Sound Energy Demonstration
Container Assembly
(Adult supervision recommended)
Pour salt, glitter, or small
foam/candy balls into the
container, but do not cover
the bottom.
Lay the speaker on the extra 3-snap and 6-snap
wires, to elevate it. Be sure speaker lays flat.
Part B: Optical Version
Modify the circuit to be this one, which has the
photoresistor (RP) instead of the adjustable
resistor (RV).
Turn on both slide switches and wave your hand
over the photoresistor (RP), to change how much
light shines into it. The sound changes as your
hand adjusts the light. At some hand positions the
salt/glitter/balls will vibrate and bounce or dance
around in the container; find the hand position that
gives the best effects. Press some keyboard keys
to combine their sounds with the photoresistor
sound. Try moving to an area with more or less
light, and wave your hand over the photoresistor
again.
Don’t eat anything you placed into the sound
energy demonstration container.
How does this work? There is a small range of
frequency at which the sound waves resonate
with the mechanical construction
characteristics of the speaker, and cause the
speaker to vibrate noticeably. The speaker’s
vibration creates changes in air pressure. The
sound energy demonstration container covers
the speaker and traps the air pressure
changes, which then push/pull the flexible
sheet up/down quickly, making the
salt/glitter/balls bounce. Raising the speaker
and container by placing them on the snap
wires (or holding them) makes the vibrations
more noticeable, because otherwise the table
can dampen the vibrations.
SCC-350_Manual_Part_B.qxp 7/25/14 2:06 PM Page 44