立体声音频功率放大器毕业论文.doc

毕 业 设 计 论 文 立体声音频功率放大器 吴江澄 指导老师姓名： 冒莉 专 业 名 称： 应用电子技术 班 级 学 号： 论文提交日期： 2011年月日论文答辩日期： 2011年12月日 2011年 12月日 摘 要 本设计了音频功率放大器，采用了分立元器件制作功率放大器且利用99 SE软件设计完成原理图和PCB板。The design of the audio power amplifier, power amplifier using discrete components and making use of the software design is completed Protel99 SE schematic and PCB board. To enhance the effect of pitch adjustment, using the bass and treble adjustment separately adjust the way. Implementation of the input audio signal tone adjusted, by means of mixing switch and volume adjustment circuit to adjust the volume while in the single-channel and dual channel conversion. End-stage power amplifier circuit using two amplifier, pre-use operational amplifier, and volume adjustment circuit with, the audio signal amplification, to ensure that end-stage power amplifier input signal strength is large enough to achieve the design specifications of the output power requirements. In addition, also designed a power supply circuit, power amplifier circuits for the entire power supply. Volume control circuit including bass and treble adjustment circuits regulating circuit. Bass adjustment circuit is actually a low-pass filter (treble adjustment circuit is actually a high-pass filter), can enhance the low-frequency signals and attenuation. Adjust bass treble adjustment circuits with a similar circuit Power amplifier driver stage and power amplifier circuit consists of two circuit. Drive-level gain of 4.7, the final stage power amplifier circuit consisting of VMOS tube push-pull class AB amplifier. Drive-level inverter circuit as a percentage of real amplifier circuit. To ensure reliable and safe circuit to work, you need to install each tube amplifier heat sink large enough to meet the cooling requirements. [Key Words]：Power amplifier, operational amplifier, Bass adjustment，Treble adjustment 目 录 绪论 1 设计指标 2 一单元电路的概述 3 1.1整体电路的概述 3 1.2音调调节电路 3 1.2.1低音调节电路 3 1.2.2高音调节电路 4 1.3音量调节电路 5 1