MartinFowler

[Guangxi Normal University Competition] Practical Audio Amplifier

Overview

放大通道的放大通道的正弦信号输入电压幅度为 0.1～1V pp ；采用双电源直流供电，
电压不大于±20V；在等效负载电阻 R L 为 8Ω 时（功率放大部分单独供电），音频
放大器应满足：
① 最大不失真输出功率 P OR ≥10W（失真度小于 10%），此时效率 η≥40%。
② 功率放大带宽 BW≥（40～20000）Hz。
③ 前置放大输入端短接到地时，R L =8Ω 上的交流噪声 V PP ≤200mV pp 。
④ 前置放大具有低音、中音、高音调节功能（调节时应能明显听出低音、
高音变化）。
⑤ 具有音量调节功能。
⑵ 前置放大采用常规运放或三极管，不得采用专用前置集成电路；功率放
大部分优先采用分立元件。
⑶ 电路布局合理，接口规范、可靠。信号源输入采用 3.5mm 同轴音频接口，
功率放大输出接口采用 RCA“莲花头”母座。前置放大和功率放大两部分能单
独测试；前置放大输出接口和功率放大输入接口必须方便鳄鱼夹（长度 35mm）
接入（接口中 GND 和信号线之间的距离≥5.08mm）。放大器各模块提供方便鳄
鱼夹（长度 35mm）接入的 GND 接口。所有接口在 PCB 上利用覆铜明确标识。
2．发挥部分
⑴ 制作数字音量控制电路（不得采用专用音响音量控制集成电路，可用通
用数字电路或单片机控制电路实现），用轻触开关分别实现音量的加减，控制等
级不少于 8 级。
⑵ 制作四路音源选择电路，采用轻触开关实现音源切换。
⑶ 功能显示，包括但不限于音源选择显示、音量等级显示。
⑷ 制作用于放大器测试的正弦波发生器，输出频率包括但不限于 100Hz、
1kHz、10kHz 三个频率点（频偏≤±5%），输出频率便于切换或调节。
⑸ 其它（如自制电源、图形化显示、无线遥控、PCB 触摸按键替代轻触开正弦信号输入电压幅度为0.1-1Vpp；采用双电源直流供电，电压不大于20V;

Design Files

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Update:2024-11-21 21:15:20

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