Elenco Snap Circuits SOUND &reg - Manual (Page 48)

Project 66 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 58 (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 500k W adjustable
resistor (RV3).
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 67 Another Transistor Amplifier
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