Manual

Put on the 3D color glasses and look at these pictures. Notice how the red seems
to come to the front, while the blue seems to go to the back.
Build the circuit and turn on the slide switch (S1). The white LED
(D6) will be on unless there is bright light on the phototransistor
(Q4), so vary the amount of light shining on the phototransistor.
The horn (W1) will not make any sound (it is used here to help
control the phototransistor current).
Project 42
Automatic Light
This circuit automatically
turns on the light when
the room starts getting
dark.
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Project 41
3D Color T-Rex