频率f=1.43/(tpL+tpH)=1.43/(R1+2R2)C(C1=0.01uF)
周期T=0.7(R1+2R2)C(C1=0.01uF)
方波->tpL=tpH,要求R1<<R2
555定时器
3:输出端
4:清零端(低电平有效)
频率f=1.43/(tpL+tpH)=1.43/(R1+2R2)C(C1=0.01uF)
周期T=0.7(R1+2R2)C(C1=0.01uF)
方波->tpL=tpH,要求R1<<R2
555定时器
3:输出端
4:清零端(低电平有效)