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单电源放大器问题

Other Parts Discussed in Thread: LM2904

我用单电源放大器LM2904做一锯齿波与电平产生脉宽的电路。由放大器产生锯齿波,由放大器产生可调电平。

 它未产生脉冲,而是

无放大器特性,前一图幅值低于6V,后一低值大于6V。