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运放OPA2735问题求助!!!

Other Parts Discussed in Thread: OPA2172, LM1875

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!!!!