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3.5 驻极体传声器极头直流极化电容传声器的晶体管放大器,可由一个低压直流电源供电。只有极头的极化,要求高的电动势(并无电流)。为了简化这种电压源,近年电容传声器常具有永久极化的驻极体薄型振膜。这种薄膜主要是聚四氟乙烯。要把它加工成驻极
3.5 Electret microphones Pole DC polarized condenser microphone transistor amplifier can be powered by a low-voltage DC power supply. Only polar polarization requires high electromotive force (no current). In order to simplify this voltage source, in recent years, condenser microphones often have a permanently polarized electret thin diaphragm. This film is mainly polytetrafluoroethylene. It should be processed into elegance