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我们已经介绍了无线耳机的红外发射部分,这里接着来谈其接收部分。由于接收部分承担着耳机功率放大。因此供电是首要突出的问题。不象发射部分可以直接从电网取电。本文介绍的接收部分供电电压设计为9V,耗电30mA,可用市售9V迭层电池。高阻和低阻耳机均可使用。接收部分采用的都是常用半导体器件、廉价易购。 接收距离设计为4米,当然,在发射或接收端加透镜还可以加大距离。但听音者移动的范围会受到限制。灵敏度也没有必要设计得过高,以便降低带外噪声。建议采用不带任何均衡的优质耳机。否则可能引入人为
We have introduced the infrared part of the wireless headset, here we talk about the receiving part. As the receiving part of the headphone power amplifier. Therefore, the power supply is the most prominent issue. Unlike the launch part can take power directly from the grid. This article describes the receiving part of the supply voltage is designed to 9V, power consumption 30mA, commercially available 9V laminated battery. High resistance and low resistance headphones can be used. Receiving part of the commonly used semiconductor devices are used, cheap easy to buy. The receiving distance is designed to 4 meters, of course, plus the lens on the transmitting or receiving side can also increase the distance. However, the scope of the listener’s movement will be limited. It is also not necessary to design the sensitivity too high in order to reduce the out-of-band noise. It is recommended to use high-quality headphones without any balance. Otherwise it may be artificial