Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 44)

Project 32 Automatic Light
Project 33 Color Oscillator
LED
Attachments
Project 34
Slow Color
Oscillator
-43-
Build the circuit and turn on the slide switch (S1). Set the lever on the
adjustable resistor (RV) so the white LED (D6) just turns off. Slowly
cover the phototransistor (Q4) and the white LED brightens. Adjust the
light to the phototransistor to turn the white LED on or off.
This is an automatic street lamp that you can turn on at 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.
You can replace the white LED with the color LED (D8) or the red LED
(D1), but you may need to readjust the sensitivity using the lever on RV.
Use the preceding circuit,
but replace the 0.1mF
capacitor (C2) with the 1mF
capacitor (C7). The circuit
works the same way, but
does not change colors as
quickly.
Build the circuit as shown, and place
one of the LED attachments (tower,
egg, or fiber optic tree) over the LED on
the Color Organ (U22). Turn on the
switch (S1) and watch. The color organ
light will change colors on its own.
This circuit is an oscillator; it
uses the color organ to control
itself.
SCC-350_Manual_Part_A.qxp 7/25/14 2:40 PM Page 44