设计要求 （1）输入信号为30mv峰峰值的正弦波，频率范围 20HZ~20KHZ，输入阻抗Ri ≥20KΩ，前级程控放大器增益通过单片机键盘输入控制，增益可预置为 10db，20db，30db，40db。 （2）后级功率放大器输出功率≥3W

Packet : 音频功率放大器的设计与制作.doc filelist

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