Elenco Projects 102-305 - Manual (Page 40)

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Project #213 Music Radio Station
OBJECTIVE: To create music and
transmit it to a radio.
OBJECTIVE: To create music
and transmit it to a radio.
Project #214
Alarm Radio
Station
Project #215 Standard Transistor Circuit
OBJECTIVE: To save some electricity for later use.
Turn on the slide switch (S1) and move the adjustable
resistor (RV) control lever across its range. When the lever
is all the way down the LED (D1) will be off, as you move
the lever up it will come on and reach full brightness.
This circuit is considered the standard transistor
configuration for amplifiers. The adjustable resistor control
will normally be set so that the LED is at half brightness,
since this minimizes distortion of the signal being amplified.
Replace the music IC (U1) with
the alarm IC (U2), and then you
will hear a machine gun sound on
the radio. You may need to re-
tune the variable capacitor (CV).
You need an AM radio for this project.
Build the circuit shown on the left and
turn on the slide switch (S1). Place it
next to your AM radio and tune the
radio frequency to where no other
station is transmitting.
Then, tune the variable capacitor
(CV) until your music sounds best on
the radio.
To learn more about how circuits work, visit www.snapcircuits.net or page 74 to find out about our Student Guides.