June 2024
Intermediate to advanced
280 pages
11h 5m
English
Content preview from Make: Radio
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175Experiment 10: Regenerative AM Receiver
varying magnetic field from incoming radio waves. The variable
capacitor C6 and L2 together form a resonance circuit; you
select the reception frequency by adjusting the capacitance of
C6. The resonance circuit is connected to the amplifier input
pins 2 and 3.
Now, you may ask, how does the LM386 demodulate the
signal? Just amplifying an AM signal is not enough to recover
the audio. Honestly, I don’t know the complete answer. There
has to be an effect like that of the diode in the “crystal” radio
in Experiment 1, recovering the audio by rectifying the radio-
frequency signal. The base-emitter junction ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.