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.
We find this circuit in a 1980s documentation for amateur radio. The circuit shows how to switch...
The SCR used in this 80's circuit depends on the load. The control is half wave and instead of the neon...
This circuit has been found in older telecommunications documentation. The circuit switches off after...