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Project #107
OBJECTIVE: To show how light is used to control a
Press the press switch (S2) on and set the adjustable resistor (RV) so
the lamp just lights. Slowly cover the photosensitive resistor (RP) and
the lamp brightens. If you place more light at the photosensitive
resistor the light dims.
This is an automatic street lamp that you can turn on by a certain
darkness and turn off by a certain brightness. This type of circuit is
installed on many outside lights and forces them to turn off and save
electricity. They also come on when needed for safety.
Automatic Street Lamp
Project #108
Voice-Controlled Rays of Light
Turn the slide switch
(S1) on. There will be
only a weak light
emitting from the green
LED. By blowing on
the mic (X1) or putting
it near a radio or TV
set, the green LED will
emit light, and its
brightness changes as
the loudness changes.
Project #109
Blowing Off the Electric Light
Install the parts. The
lamp (L1) will be on. It
will be off as long as
you blow on the mic
(X1). Speaking loud
into the mic will
change the brightness
of the lamp.
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