Elenco LIGHT - Manual (Page 52)

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Project 96 Counting Light
Project 97 Adjustable Counting Light
Build the circuit as shown and turn
on the switch (S1). Place one of the
LED attachments over the LED on
the color organ (U22). Connect the
color LED (D8) using the red &
black jumper wires and hold it just
above the phototransistor (Q4), so
that it shines directly into the
phototransistor. For best effects, do
this in a dimly lit room. Every few
seconds, the color organ light will
change colors.
The color organ is counting
how many times light turns the
phototransistor on or off. At
some count levels, the color
organ changes colors.
Build the circuit as shown and turn on the
switch (S1). Place one of the LED
attachments over the LED on the color
organ (U22). Connect the white LED (D6)
using the red & black jumper wires and
hold it just above the phototransistor (Q4),
so that it shines directly into the
phototransistor. For best effects, do this in
a dimly lit room. The color organ light will
change colors, the lever on the adjustable
resistor (RV) controls how fast the colors
change.