基于TDA2030A超低音功放电路的设计.doc

摘 要 摘 要 功放，可以说是各类音响器材中最大的一个家族了，其作用主要是将音源器材输入的较微弱信号进行放大后，产生足够大的电流去推动扬声器进行声音的重放。 特别的，TDA2030A功率放大电路所需的元件很少，制作简单，效果良好。用它来做电脑有源音箱的功率放大部分或MP4等小型功放再合适不过。 本设计主要由电源部分、音调控制级、功率放大级三部分组成。它的作用主要是放大音频信号。为了保证功放效果，电路采用TDA2030A作为功放IC，因为它具有失真小、功率大、外围元件少、开机冲击极小、内含各种保护电路、保真度高等优点。 信号流程：音频信号输入经音量电位器，再由电容耦合，进入TDA2030A的1脚，由集成电路放大后从4脚输出，经输出耦合电容到达扬声器。  关键字：TDA2030A 功放电路 放大音频信号 ABSTRACT 目 录 ABSTRACT The power amplifier can be regarded as the biggest family among various types of audio equipments，the main function of which is to amplify the weak signal that audio equipment inputs, thus producing a large enough current to drive the sound reproduction of speakers. In particular, the power amplification circuit of TDA2030A contains a small number of components and is easy to make，but has a good effect. It would be very suitable if it is used as the power amplifier of the active speaker of computer or the minitype amplifier of MP4. This project mainly consists of three parts: the power source, the tone control level, and the power amplified level. It is mainly used to amplify the audio signal. In order to ensure the effect of power amplifier, the TDA2030A is used as the IC of power amplifier in the electric circuit, as it has a series of advantages: low distortion, big power, less peripheral elements, extremely small starting impact, containing various kinds of protection circuits, high fidelity, etc... The signal flow: First, the audio signal is input by the volume potentiometer, and then coupled by capacitor. Second，after flowing into the line 1 of TDA2030A, it is amplified by the IC. Finally，the audio signal is output from line 4 and then reaches speaker through the coupling capacitor of output. Keywords: TDA2030A The circuit of Power amplifying Amplification of audio signal PAGE ii 目 录 PAGE i 目 录 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc8818 第一章 概述 PAGEREF _Toc8818 1 HYPERLINK \l _Toc28876 1.1 系统开发背景及研究现状 PAGEREF _Toc28876 1 HYPERLINK \l _Toc17408 1.2人们使用超低音的理由 PAG