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 circuit is from an old Elektor using components that are not currently common. The circuit is...
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
Here we have an interesting circuit found in a 1981 publication that causes two LEDs to flash...