基于njm4580的简易话筒放大器设计+Multium电路图
关键字： 话筒；放大电路；放大器；njm4580；运放
Design of the Simple Microphone Amplifier Based On 4580
Abstract: This paper introduces the basic principle of the design of the simple microphone amplifier based on 4580 and its mainly design process. The core of this design is njm4580 operational amplifier, combined with the peripheral negative feedback amplifying circuit , joined a number of filter capacitor,which constitute a small amplification system. We use a 9V battery as the power part.Take into account that the chip is duplicate supply , I put a circuit which can transit single power supply to duplicate supply. Connect the battery with the circuit as the power supply part of the whole design. At first the software Multium was used to design the circuit diagram, and the circuit was simulated, so initial effect was obtained. After the simulation and get a amplified characteristics, a circuit can be set up and the devices can be welded. After doing that ,what should be done is to test the circuit ,observe the waveform and we found that the circuit can amplifier the voltage input from the input port. Connect the amplifier with computer and microphone, some voice can be herd while there is not any sound without the amplifier.
Key Words: microphone；amplifier circuit；amplifier；NJM4580；operational amplifier
目录
1 绪 论 1
2 话筒概述 2
3 声卡 6
3.1 声卡功能简介 6
3.2声卡原理 6
3.3笔记本声卡 6
4 研究现状 8
4.1 国内产品 8
4.2 国外产品 10
5 设计过程 12
5.1 元件库制作说明 12
5.2 制作元件库 12
5.3 PCB设计流程 18
5.3.1 电源、地线处理 19
5.3.2 共地处理 20
5.3.3 连接的处理 21
5.3.4 网络系统的作用 24
5.4 NJM4580 26
5.5 运放性能指标 28
5.5.1 理想运放 28
5.5.2 性能指标 29
6 仿真 30
6.1 仿真软件 30
6.2 仿真图 30
7 测试结果 33
8 总结 36
致 谢 37
参考文献 38
1 绪 论
麦克风又称为话筒，早已成为我们司空见惯的东西。话筒在人们的日常生活中是很常见的。教师授课，录音棚里录制音乐，歌星开演唱会，大型会议、讲座等都离不开话筒。可以说，话筒给我们的生活带来了很多方便，在现代化都市中，离了话筒很多工作都将无法开展。
而话筒发展至今，已有很多的种类。单单一个话筒和一个音响播放出来的声音是无法满足我们的要求的，有的甚至连声音也无法发出。就像动圈式话筒是利用电磁感应现象制成的，把声音转变为电信号。这个信号非常微弱，必须经过放大处理。也就是通过话筒放大器对信号进行前置放大。再通过功放将音源器材输入的较微弱的信号进行放大后，产生足够大的电流去推动扬声器进行声音的重放。
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