Discover how amplitude modulation works through a detailed guide covering its principles, waveform behavior, and hands-on AM circuit demo using simple electronic components. Great for students and RF beginners. Read more : https://circuitdigest.com/electronic-circuits/what-is-amplitude-modulation-complete-guide-formula-circuit-diagram-practical-demonstration

1. Author
Rithik Krisna

2. AMPLITUDE MODULATION
Amplitude Modulation (AM) is
a technique to transmit signals
by varying carrier wave
amplitude.
The amplitude of the high-
frequency carrier changes
based on the message signal.
Commonly used in early radio
broadcasting and
communication systems.
Frequency of the carrier
remains constant in AM.

3. HOW DOES AM WORK?
Carrier Wave: A high-frequency
wave is generated (e.g., 380 kHz).
Message Signal: An audio signal
like music or speech is prepared.
Modulation: The audio signal
changes the amplitude of the
carrier wave.
Transmission: The combined
signal is sent out through an
antenna.
Reception: A radio receiver
detects and plays back the audio.

4. SIMPLE AM MODULATOR CIRCUIT
ICL8038 for generating
the carrier wave
Bluetooth audio receiver
for input message signal
BC547 transistor as the
modulator
12V power
7805 regulator gives 5V
to the Bluetooth
module.

5. WHY AM STILL MATTERS
AM Radio
Broadcasting
Aviation
Communication
Morse Code
Transmissions
Two-Way Military
Radios

6. For a more in-depth tutorial,
check out this article:
https://circuitdigest.com/electronic-
circuits/what-is-amplitude-
modulation-complete-guide-
formula-circuit-diagram-practical-
demonstration
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For a more in-depth tutorial,
check out this article: