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42
Music Radio Station
OBJECTIVE: To create music and transmit it to a radio.
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.
Project #115
Fading Siren
OBJECTIVE: To produce sound of a siren driving away into
the distance.
Press the press switch (S2), the alarm IC (U2) should make the sound of
an up-down siren that gets weaker with time. The fading is produced by
the charging of the 470mF capacitor (C5). After it is charged the current
stops and the sound is very weak.
To repeat this effect you must release the press switch, remove the
capacitor, and discharge it by placing it across the snaps on the bottom
bar marked A & B. Then, replace the capacitor and press the switch again.
Project #113
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).
Replace the 470μF capacitor (C5) with the 100μF capacitor (C4), the siren
fades faster.
Project #114
Alarm Radio Station
Project #116
Fast Fade Siren
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