Adjustable and cyclic timing controller circuit composed of CD4001 and CD4017

This timing controller uses the "point" signal of the liquid crystal electronic meter, and after taking it out, it forms a multi-gear multi-level timing control function through the combination of two-stage frequency division circuits. It can form a single timing on, off or automatic cycle working mode through the control of the control switch. The control time is adjustable from 1 to 90 minutes. The circuit composition is shown in the figure.