This circuit was found in a RE Experimenter Handbook from the 90's. The components are of the time, rare nowadays, except the 555 and 4017.
Suggested by an American publication of 1964 this circuit is intended for the capture of signals...
We found this circuit in a 1980s General Electric documentation. It appears from other sources in this...
Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be...