35W Audio Amplifier based LM391

4 Stage FM Transmitter. This FM transmitter circuit utilizes four radio frequency stages, functioning as a VHF oscillator. It is available for wholesale through fmuser, including the CZE and CZH models of FM transmitters, which are suitable for OEM and ODM low power applications.

The 4 Stage FM Transmitter circuit is designed to operate efficiently within the Very High Frequency (VHF) range, typically between 30 MHz and 300 MHz. The architecture consists of four main stages: an oscillator stage, a modulator stage, a power amplifier stage, and a final output stage.

1. **Oscillator Stage**: The initial stage generates a carrier frequency using a VHF oscillator circuit. This oscillator can be based on a Colpitts or Hartley configuration, utilizing components such as transistors, capacitors, and inductors to achieve the desired frequency stability and output.

2. **Modulator Stage**: The modulator stage is responsible for encoding the audio signal onto the carrier frequency. This is usually achieved using a circuit that allows the modulation of the oscillator's amplitude or frequency, depending on the type of modulation employed (AM or FM). The audio input is typically coupled into this stage through capacitive coupling to ensure that DC voltage does not interfere with the audio signal.

3. **Power Amplifier Stage**: The power amplifier stage boosts the modulated signal to a level suitable for transmission. This stage typically employs a high-gain transistor or an RF amplifier IC that can handle the required output power while maintaining linearity to prevent distortion of the transmitted signal.

4. **Output Stage**: The final output stage consists of a matching network and an antenna. The matching network ensures that the transmitter output is efficiently coupled to the antenna, minimizing signal reflection and maximizing radiation efficiency. The antenna design is critical for the effective transmission of the FM signal, and it may vary in configuration based on the desired range and application.

Overall, this 4 Stage FM Transmitter is suitable for various applications, including educational projects, low-power broadcasting, and hobbyist use, with options available for customization and integration into larger systems. The availability of OEM and ODM services allows for tailored solutions to meet specific user requirements.4 Stage FM Transmitter This is the FM transmitter circuit which apply 4 radio frequency stages, that are a VHF osci Wholesale fmuser CZE CZH FM Transmitter,Fm Transmitter % FM Radio Transmitter for sale ?czhfmtransmitter,OEM ODM Low Power Fm Transmitter.. 🔗 External reference