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.
This low hysteresis circuit was obtained from old documentation. The circuit must be powered by a...
This National Semiconductor circuit uses integrated circuits that are uncommon today. The circuit...
Old phones with dials can be used in a simple home intercom system, as this circuit from Popular...