1991年我们在安装厂职工俱乐部舞厅中,需控制多组彩灯循环亮灭,笔者采用了《机床电器》1989年No3期的“一种简单循环式控制电路”(图1所示).然而实际安装调试过程中发现,该电路虽然简单,但是存在设计上的缺陷,易出现末级(循环节)不循环和电路跳跃循环两种故障,且出现这两种故障的概率比较大,几乎达到了50%.下面简要分析产生这两种故障的原因,并给出改进后的电路图. In 1991 we installed factory workers Club Ballroom, the need to control multiple lights cycle light off, I used the “Machine Electric” No. 3 in 1989, “a simple loop control circuit” (Figure 1) However, The actual installation and debugging process found that although the circuit is simple, but there are design flaws, prone to the final stage (cycle) does not cycle and circuit hopping cycle of two kinds of failure, and the probability of these two failures is relatively large, almost to 50%. The following briefly analyzes the causes of these two failures, and gives the improved circuit.