This circuit was found in an American documentation from the 90's. What it does is provide at the output a voltage that is the average of the voltages set for the inputs.
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...