This circuit is from the 1989 special edition of Radio Electronics Experimenter. The circuit was created with SMD components to be mounted on a keychain.
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The L78xx is equivalent to 78xx...
We found this circuit in Radio Electronics magazine from October 1962. The article announced the...
This sequential relay actuation system circuit for traffic lights was found in Electronics Now...