With the aid of a block diagram, explain how AM transmitter works.

Block Diagram of an AM Transmitter:

[Image of an AM transmitter block diagram]

1. Microphone and Preamplifier:
- The microphone converts sound waves into electrical signals.
- The preamplifier amplifies these signals to a suitable level for processing.

2. Audio Processor:
- This circuit processes the audio signal, such as adding equalization and compression.

3. Audio Modulator:
- The audio signal is used to amplitude modulate a carrier wave (typically in the radio frequency range).
- This results in the amplitude of the carrier wave varying according to the audio signal.

4. Carrier Oscillator:
- Generates the carrier wave at a specific frequency.

5. Power Amplifier:
- Amplifies the modulated carrier wave to the desired power level for transmission.

6. Antenna:
- Transmits the amplified AM signal into the air.

Operation:

1. Sound waves are converted into electrical signals by the microphone.
2. The preamplifier amplifies the signal.
3. Audio processing adjustments are made.
4. The audio signal modulates the carrier wave in the audio modulator.
5. The power amplifier increases the signal strength.
6. The modulated signal is transmitted through the antenna into the air.
7. The amplitude of the transmitted signal varies according to the original audio signal.
8. At the receiver, the AM signal is demodulated to recover the original audio.