555组成的振荡有很多种,你这个是间接反馈无稳公式T1=0.693*(R1+RV1)*C (R=欧姆,C=法拉)T2=0.693*RV1*C频率=1.443/(R1+2*RV1))*C
Foutput=1.443/((R1+(RV1*2)*C)Pin5 can control the high% in T1+T2 (0-100)