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该助听器采用一块集成音频功率放大器构成主电路,配以高灵敏度低噪声的驻极体话筒作为声电转换器件,电路简单,安装方便,是一种实用的助听仪器。电路介绍:电路如图一示,该主电路由一块5G37及外围元器件构成,电容电阻值见图示值。5G37作为音频功率放大其性能稳定,干扰小。其中 C_2可以作为反馈器件用来作频率衰减,若需要输出高频成份多一些容量值可以取小一些,反之可取大一些,图中取值为220pf;C_5、R_5组成茹具尔网络,使等效负载接近纯阻性,因而有可能避免由于电感性元件产生过电压引起损坏。
The hearing aid adopts an integrated audio power amplifier to form a main circuit, and is equipped with a high-sensitivity and low-noise electret microphone as a sound-electricity conversion device. The utility model has the advantages of simple circuit and convenient installation and is a practical hearing aid instrument. Circuit Description: The circuit shown in Figure 1, the main circuit by a 5G37 and peripheral components, capacitor resistance values shown in the figure. 5G37 audio amplifier as its performance and stability, small interference. Which C_2 can be used as a feedback device for frequency attenuation, if you need to output more high-frequency components, some of the capacity value can be taken smaller, on the contrary should be larger, the value of the figure is 220pf; C_5, R_5 composed of a network of Seoul, so that The effective load is close to purely resistive, making it possible to avoid damage due to overvoltage in inductive components.