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小型室内感应无绳电话姜小强本文介绍的小型无绳电话采用音频感应和射频发射相结全的方式进行双工通信，并采用集成化设计，使得电路的制作和调试都很容易，非常适合爱好者制作。工作原理图１、图２分别为主机和手机电原理图。从外线传来的铃流信号经隔直电容器Ｃ；送到振...
Small indoor induction cordless phone Jiang Xiaoqiang This article describes the small cordless phones with audio sensing and radio frequency transmission of the whole way to carry out duplex communication, and the use of integrated design, making the circuit making and debugging are easy, ideal for enthusiasts making . Working principle Figure 1, Figure 2, respectively, for the host and mobile phone schematic. Ringing signal from the outside came through the DC blocking capacitor C;