Basic low power AM transmitter

This transmitter is basic but allows the transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, along with a modulator stage that mixes the incoming audio with the RF signal.

The described transmitter circuit is designed to facilitate audio transmission to an AM radio receiver. At its core, the circuit comprises an RF oscillator that generates radio frequency signals within the AM broadcast band, typically ranging from 530 kHz to 1700 kHz. This oscillator is crucial for establishing the carrier wave that will be modulated with the audio signal.

The modulator stage is integral to the operation of the transmitter. It combines the audio input—such as voice or music—with the RF signal produced by the oscillator. This mixing process alters the amplitude of the carrier wave in accordance with the variations in the audio signal, resulting in an amplitude-modulated (AM) signal that can be transmitted over the air.

Key components of the RF oscillator may include a tank circuit, consisting of an inductor and capacitor, which determines the frequency of oscillation. Transistors or operational amplifiers are often used in the oscillator design to amplify the generated signal. The modulator stage typically utilizes a transistor configured as a mixer, where the audio input is fed into the base or gate terminal, allowing the modulation to occur.

To ensure effective transmission, the circuit may incorporate an output stage that includes a power amplifier to boost the modulated signal before it is sent to the antenna. The antenna serves as the radiating element, converting the electrical signal into electromagnetic waves that propagate through the air.

For optimal performance, considerations such as impedance matching, filtering, and tuning may be implemented in the circuit design. This ensures that the transmitter operates efficiently within the desired frequency range and minimizes interference with other communication channels. Overall, this basic transmitter serves as an educational platform for understanding the principles of amplitude modulation and radio frequency transmission.This transmitter is basic but allows transmission of audio to an AM radio. It consists of an RF oscillator operating in the AM broadcast band, together with a modulator stage, which mixes the incoming audio and the RF 🔗 External reference