Elenco LIGHT - Manual (Page 26)

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Project 13 Tones Over Light
Project 14 Color Optic Sounds
Build the circuit as shown. Place the clear cable holder on the red LED
(D1) and the black cable holder on the phototransistor (Q4), then place
the fiber optic cable into the holders as far as it will go. For best
performance the fiber optic cable should stand straight up in the
holders, without bending them.
Turn on the slide switch (S1) and move the lever on the adjustable
resistor (RV) around. The sound from the speaker (SP) changes as you
move the lever on RV.
Build the circuit as shown. Place the clear cable holder on the color LED
(D8) and the black cable holder on the phototransistor (Q4), then place
the fiber optic cable into the holders as far as it will go. For best
performance the fiber optic cable should stand straight up in the
holders, without bending them.
Turn on the slide switch (S1) and push the press switch (S2). Light is
transmitted from the color LED, through the fiber optic cable, to control
the strobe IC (U23) and speaker (SP).
This is similar to project 12 but
not as loud. The project 12
circuit uses a two-transistor
amplifier while this circuit only
has one transistor.
Black
Clear
Clear
Black