This basic Schmitt trigger was found in an American publication from 1968. The circuit uses transistors from the time. Modern general-purpose types can be used.
This circuit has its frequency controlled by a 1MHz crystal. The circuit can be powered by...
This circuit, found in a 2000 documentation, is used in simple artificial intelligence and robotic...
Found in National Semiconductor documentation from the 1990s, this circuit switches video signals to...