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<p>
This is a "<a
href="http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/amfmdet.html#c1">crystal
radio</a>",
an AM radio receiver with no amplifier.<span style="mso-spacerun:
yes"> </span>The raw antenna feed is shown in the first scope slot
in the lower left.<span style="mso-spacerun: yes"> </span>The
inductor and the capacitor C1 are tuned to 3 kHz, the frequency shown in
the lower right as "res.f".<span style="mso-spacerun: yes">
</span>This picks up the carrier wave shown in the middle scope
slot.<span style="mso-spacerun: yes"> </span>A diode is used to
rectify this, and the C2 capacitor smoothes it out to generate
the broadcast
signal in the last scope slot (which is simply a 12 Hz sine wave in this
example).<span style="mso-spacerun: yes"> </span>By experimenting
with the value of C1's capacitance, you can pick up two other "stations"
at 2.71 kHz and 2.43 kHz.
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<br>Generated Wed Dec 7 2016
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