DIY Kit FM Transmitter Radio Station Stereo BH1417F Soldering Required E142

Product Description:
This circuit serves as the core of the BH1417F phase-locked loop FM stereo application-specific integrated circuit, offering advanced features for a high-quality FM stereo experience. The integrated circuit incorporates several components, including a signal-to-noise ratio (S/N) improvement pre-emphasis circuit, an over-modulation limiter circuit to prevent distortion, and a low-pass filter circuit (LPF) to control the input signal frequency. It also generates the stereo composite signal and includes an FM stereo modulation circuit and a phase-locked loop (PLL) circuit.
 
The BH1417F boasts excellent frequency characteristics, achieving a remarkable 40 dB separation degree, and its transmission quality can be compared to that of local FM radio stations. Thanks to the high-frequency oscillation frequency synthesis circuit, the oscillation frequency is highly stable and can be easily adjusted to change the transmission frequency. Additional features such as the pre-emphasis circuit, limiting circuit, and low-pass filter contribute significantly to enhancing sound quality. The total harmonic distortion is a mere 0.3%, and the RF output level reaches 100 dB.
 
Please note that this item is provided in a disassembled state and requires self-assembly, providing an enjoyable DIY experience.
 
Specifications:
    Chip: BH1417F
    Frequency Range:
        Low-end (87.7MHz to 88.9MHz)
        High-end (106.7MHz to 107.9MHz)
    Input Power: 9-12V, 200mA
    Transmit Power: 5V, 100M
    Stereo Separation: 40dB
    Total Harmonic Distortion: 0.3%
    RF Level: 100dB
    Applications: Suitable for wireless music players, TV audio
    Note: Kit does not include an antenna. The main figure in the first picture is the finished product, provided for reference only.
    14 operation frequencies can be selected using the DIP switch.
 
Frequency Selection via DIP Switch:
    L L L L 87.7MHz
    H L L L 87.9MHz
    L H L L 88.1MHz
    H H L L 88.3MHz
    L L H L 88.5MHz
    H L H L 88.7MHz
    L H H L 88.9MHz
    L L L H 106.7MHz
    H L L H 106.9MHz
    L H L H 107.1MHz
    H H L H 107.3MHz
    L L H H 107.5MHz
    H L H H 107.7MHz
    L H H H 107.9MHz
 
Debugging Tips:
For optimal performance during debugging, it is recommended to use a 9V DC regulated power supply. The use of a battery as a power supply is highly recommended to eliminate background noise caused by power communication, ensuring the best sound quality.