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这种小型调频话筒有体积小,线路简单,保真度高,易于制作等特点。它的发射频率在88～108MHz范围内,用调频收音机或带调频波段的收录机均能接收。一般距离在60米以上,可作为短距离通话用。工作原理:本机原理图如图1,R_1是驻极体话筒内藏场效应管跟随器的外接负载电阻。驻极体话筒产生的音频电压经过耦合电容C_1送至由BG_1、R_2、R_3、
This small FM microphones are small, simple circuit, high fidelity, easy to make and so on. Its launch frequency is in the range of 88 ~ 108MHz, can be received by FM radio or tape recorder with FM band. General distance of 60 meters or more, can be used as a short distance call. How it works: The schematic diagram of the machine is shown in Figure 1, R_1 is the external load resistance of the FET follower of the built-in electret microphone. The audio voltage generated by the electret microphone passes through the coupling capacitor C_1 to the BG_1, R_2, R_3,