This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at the end of the timer, erasing the other. The timing can be increased by changing C1.
This circuit was found in General Electric's 1965 documentation. It appears elsewhere on the site....
We found this circuit in a 1962 publication by General Electric. The circuit applies to common...
This multi-output oscillator uses CMOS integrated circuits that are uncommon today, but they can...