Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 61)

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Project 89 Blinking Beeping
Project 91 Blinking Control Project 92
Blinking Control
Beeping
Project 90
Blinking
Blinking
The color LED (D8) has a
microcircuit that changes the
light colors. As it does this, it
changes the current through
the circuit. The transistor (Q2)
amplifies the changing
current and uses it to control
the speaker (SP2).
Build the circuit as shown and turn on the switch
(S1). The color LED (D8) will be blinking and you
hear beeping from the speaker.
Use the preceding circuit, but replace the
speaker with the red LED (D1). Now the
red LED will also be blinking.
Use the preceding circuit, but replace the
white LED (D6) with the speaker (SP). Now
the blinking LED controls a beeping sound.
Build the circuit as shown and turn on the
switch (S1). The color LED (D8) and white
LED (D6) will both be blinking. The color LED
will be brighter than in the preceding circuit.
The white LED is controlled by the color LED
using the transistor (Q2). If you remove the
color LED from the circuit then the white LED
will not blink.
SCC-350_Manual_Part_B.qxp 7/25/14 2:05 PM Page 5