Elenco LIGHT - Manual (Page 53)

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Project 98 Bright Off Light
Build the circuit as shown and turn on the switch (S1). Place the circuit in
a dark room or cover the phototransistor (Q4); the color LED (D8) should
be on. Shine light on the phototransistor and the color LED turns off.
Project 99 R/C Blink & Beep
Remote
You need an infrared remote control for this project, such as any
TV/stereo/DVD remote control in your home.
Build the circuit and turn on the switch (S1). Point your remote control
toward the infrared module (U24) and press any button to activate the
red LED (D1) and speaker (SP).
Sometimes this circuit may activate without a remote control, due to
infrared in sunlight or some room lights. If this happens, try moving to
a dark room.