Elenco Electronics 202 - Manual (Page 75)

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Project #169 Music Radio Station
OBJECTIVE: To create music and
transmit it to a radio.
OBJECTIVE: To create music
and transmit it to a radio.
Project #170
Alarm Radio
Station
Project #171 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 adjustable 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 adjustable capacitor
(CV) until your music sounds best on
the radio.