Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 160)

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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 cable should stand straight up in the holders, without
bending them.
Turn on slide switch (S1) and vary the amount of light shining into the
photoresistor (RP). You hear sound from the speaker (SP2), unless
there is no light on the photoresistor. Move the lever on the adjustable
resistor (RV) around to vary the amount of echo on the sound.
Project 380 Daylight Color Fiber
Echo
Black
Clear
Build the circuit and
turn on the slide switch
(S1). Move the lever on
the adjustable resistor
(RV) to vary one tone,
press the green keys to
make a second tone,
and press the blue keys
to make a 3rd tone.
Turn the TUNE knob on
the keyboard (U26) to
adjust the tone of the
green keys.
3 Tones Project 381 Project 382
Another
3 Tones
Use the preceding circuit, but add the
0.1mF capacitor (C2) or the 1mF
capacitor (C7) over the keyboard (U26)
using a 1-snap wire, as shown. The
pitch of the green keys is lower now.
SCC-350_Manual_Part_C.qxp 7/25/14 2:11 PM Page 48