双极型555/556的等效电路和等效功能框图
http://www.go-gddq.com/upload/2010-02/100220080321742.gifhttp://www.go-gddq.com/upload/2010-02/100220080321741.gifhttp://www.go-gddq.com/upload/2010-02/100220080321743.gifhttp://www.go-gddq.com/upload/2010-02/100220080321744.gif
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