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运放电压跟随器消顶失真

Other Parts Discussed in Thread: NE5532

       各位好。我用NE5532做电压跟随器,电源正负12v,发生奇诡的事情,输入标准正玄波,输出5s内是也正玄波,但在放大器输出脚看到正玄波在往下飘,然后再往中间飘,5s以后就变成图中的样子:下半波消顶了。两个电阻短路、换成1k、10k都试过,都一样。不只哪位高人能解释以下子。在下先谢了!