电路图如附件，输入30mv、2KHz方波，12V供电。输出在空载的时候幅度能放大到9V多，加上50欧姆负载，输出就降到很低，第一次用运放，以前没做过模拟电路，请高手指点，怎样保证输出的幅度（负载能力）？ 非常着急，多谢！！！！
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