为了便于我们分析和识别电路，更好的理解555电路，这里我们这里按555电路的结构特点进行分类和归纳，把555电路分为3大类、8种、共18个单元电路。-In order to facilitate our analysis and the identification circuit, a better understanding of circuit 555, here we are here by the structural characteristics of the circuit 55