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在长途和短距离音频电路上装置音频增音机,从1903年起到现在已有近七十年的发展历程。贝尔(BELL)在1875年发明了送受话器都用电磁铁的电话,它应用(?)话人使铁片薄膜震动后在磁芯中发生磁力线的变化,産线啳电流送至对方进行通话。这样的通话系统是没有放大的,它的传送距离有限。三年之后,炭精送话嚣出现,一直到1903年,SHREEVE利用薄膜震动炭精粉的松紧接触产生较大的电流变化,制成了商用的机械式增音机,才开始了音频增音机的历史。
In the long-distance and short-range audio circuits installed audio amplifier, from 1903 up to now nearly 70 years of development history. Bell invented in 1875 a telephone with a telephone receiver that uses electromagnets to apply magnetic field changes in the magnetic core when (?) The person vibrates the iron film, and the telephone call is sent to the other party. This call system is not enlarged, it is limited transmission distance. Three years later, carbon monoxide sent a clamor, until 1903, SHREEVE use thin film vibrating carbon powder elastic contacts have a greater current change, made of a commercial mechanical amplifier, began the audio enhancement Machine history.