第1个回答 2010-06-25
扩音机专业上称为功率放大器，简称功放，是音响系统中最基本的设备，它的作用就是将来自信号源的微弱电信号进行放大，产生足够大的电流以驱动扬声器发出声音。
Professionally, audio amplifier is called power amplifier, PA in short. As fundamental equipment in the acoustic system, its function is to increase the magnitude of the weak signals from the source, so as to generate enough current to drive out sounds from the speaker.
本设计采用集成运算放大器LM741两级电压放大，还有以集成功率放大器LM386连成的输出级。
This design adopts the integrated operational amplifier LM741 for two-stage voltage amplifying and connects the integrated power amplifier LM386 for the output stage.
第2个回答 2010-06-25
Audio amplifier is call power amplifier ,abbreviated PA,which is basic device in acoustic system.It's function is amplifying weak electric signal to generate enough current to drive loundspeaker.In this design we adapt integrated amplifier LM741 in two-stage voltage amplifying and output consist of integrated amplifier LM386
第3个回答 2010-06-25
In the megaphone specialty is called the power amplifier, the abbreviation power amplifier, is in the sound system the most basic equipment, its function is comes from the supply oscillator the weak electrical signal to carry on the enlargement, produces the enough big electric current to actuate the speaker to make the sound. This design uses the integration operational amplifier LM741LIANG level voltage amplification, but also has integrates the power amplifier LM386 Lian Cheng output stage.
第4个回答 2010-06-28
Megaphone professional power amplifier, referred to as sound system of power amplifier, is the most basic equipment, it is the role of the weak signal from source to enlarge, generate enough electricity to drive the speaker sound. This design USES the integrated operational amplifier LM741 two-stage voltage amplifier, and integrated amplifier output level of LM386 together.答案