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Project #213 Music Radio Station
OBJECTIVE: To create music
OBJECTIVE: To create
music and transmit it to a
Project #214
Alarm Radio
Station
Project #215 Saved Electricity
Put on the switch, then connect points X and Y (use a 2-
snap wire). The green LED will flash and then go out, as
the 470
µ
F capacitor is charged with electricity. Now
disconnect X and Y and instead make a connection
between Y and Z. The 6V bulb will flash as the electricity
stored in the 470
µ
F discharges through the resistor and
transistor. The capacitor was storing electricity to be used
at a later time, just like a battery does!
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 re-tune
the adjustable capacitor.
You need an AM radio for this project.
Build the circuit shown on the left and
turn on the switch. 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.
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