Stereo FM Transmitter Using BA1404
The BA1404 FM transmitter circuit is designed to provide high-quality stereo audio transmission over a wide frequency range, making it suitable for various applications such as personal broadcasting, educational purposes, or small-scale radio station setups. The IC integrates essential functionalities, which simplifies the circuit design and reduces the component count.
The circuit typically consists of the BA1404 IC, a few passive components such as resistors and capacitors, and an antenna for signal transmission. The power supply voltage can be adjusted within the specified range, allowing for flexibility in different applications. The output power can be controlled by adjusting the input audio signal level, ensuring that the transmitted signal remains within legal limits.
The FM modulator within the BA1404 modulates the audio signal onto a carrier frequency, which is determined by an external oscillator circuit. The RF amplifier enhances the signal strength before it is sent to the antenna, ensuring a clear transmission over the desired distance. Additionally, the built-in stereo modulator allows for stereo audio input, enabling the transmission of two-channel audio signals.
To enhance performance, careful selection of components such as the antenna type and layout is critical. A well-designed PCB layout can minimize interference and improve the overall efficiency of the transmitter. Proper tuning of the circuit is also essential to achieve optimal performance and compliance with regulatory standards for FM transmission.A high quality stereo FM transmitter circuit is shown here. The circuit is based on the IC BA1404 from ROHM Semiconductors. BA1404 is a monolithic FM stereo modulator that has built in stereo modulator, FM modulator, RF amplifier circuitry. BA1404 FM transmitter can be operated from 76 to 108MHz and power supply for the circuit can be anything between 1.25..
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