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 found this symmetrical regulator in a documentation from the 70s. The circuit uses components...
This circuit was found in a 1995 documentation. It drives a set of sequential LEDs from the sound...
This sophisticated remote field strength meter circuit was found in a 73 magazine for radio...