Manual

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Build the circuit and turn on the slide switch (S1). The light tunnel (U30) will be on if there is
enough light on the phototransistor (Q4), so vary the amount of light shining on the
phototransistor.
Project 147
Light-Controlled Light Tunnel
You need an infrared remote control for this project,
such as any TV/stereo/DVD remote control in your
home.
Use the preceding circuit, but position it away from
lights in the room so that the light tunnel (U30) is off.
If needed, place the Q4 attachment on the
phototransistor (Q4) to help shield it from room
lights. Point your remote control directly at he
phototransistor (or into the Q4 attachment), and
press any button to turn on the light tunnel.
Note that when the phototransistor is activated by
room lights the light tunnel is on continuously, and
when the phototransistor is activated by your
infrared remote control then the light tunnel will be
blinking.
Project 148
IR-Controlled
Light Tunnel