This board is a high-performance phase-locked loop frequency modulation sound emission board. It can transmit stereo audio signals such as computer sound cards, game consoles, CD, DVD, MP3, mixers, etc. for stereo modulation and transmission. The board also contains 2 microphone amplifier circuits, which can be used with ordinary FM stereo receivers to achieve high-fidelity wireless FM stereo transmission. It is suitable for the development and production of wireless audio adapters for the production of stereo wireless speakers, wireless microphones, wireless headphones, CD, MP3, DVD, PAD, notebook computers, etc.

 

The core of this circuit is the BH1417F phase-locked loop FM stereo transmitter dedicated integrated circuit. This integrated circuit is composed of a pre-emphasis circuit to improve the signal-to-noise ratio (S/N), a limiter circuit to prevent signal overmodulation, a low-pass filter circuit (LPF) to control the frequency of the input signal, and a stereo modulation circuit to generate a stereo composite signal. , FM transmitter phase-locked loop circuit (PLL) and other components. The frequency characteristic of BH1417F is very outstanding, it can reach the separation of 40dB, the sound quality transmitted can be comparable to the local FM radio station. Since the high-frequency oscillation part adopts a frequency synthesis circuit, the oscillation frequency is very stable, and the transmission frequency can be easily changed. Moreover, it is equipped with a pre-emphasis circuit, a limiter circuit and a low-pass ripple, which can significantly improve the sound quality, with a total harmonic

distortion of 0.3% and an RF output level of 100dB.

 

 

1PCS * BH1417F FM Stereo Transmitter Radio Players PLL 40dB DIY Kits for CD MP3