This timer for long time intervals is from the 1990 Motorola Linear Databook. The setting applies to other operational ones and component values are given below the diagram.
Other operational amplifiers series, such as the MC34072, MC34074, MC35071, MC35072, MC35074 or...
We found this circuit in an English publication in 1982, but it can still be easily assembled by...
This conventional slow-moving circuit uses incandescent light bulbs, but can be changed to use...