Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 119)

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Project 246 L/R Music Amplifier
MP3 player The left and right outputs of
your music device are intended
to control separate speakers,
but are combined here
because you only have one
Snap Circuits ® speaker.
This circuit is similar to
project 239 (Amplified Big
Brightness Adjuster), but
the color LED will not be
quite as bright. In this circuit
both the controlling current
(through RV3) and
controlled current (through
R1) also flow through the
color LED, reducing the
amplification.
Vary the brightness of the color
LED (D8) using the 500kW
adjustable resistor (RV3).
Next, replace the color LED(D8)
with the red or white LEDs (D1 &
D6), and see how they compare.
Build the circuit, and turn on the slide switch (S1).
Connect a music device (not included) to the audio
jack (JA) as shown, and start music on it. Use the
lever on the adjustable resistor (RV) to adjust the
volume for the left and right outputs of your music
device; both won’t be loud at the same time.
Project 247 Another Transistor Amplifier
SCC-350_Manual_Part_C.qxp 7/25/14 2:10 PM Page 7