The diodes are for general use and the transistors also in this Exclusive-OR circuit. The circuit may have the values of the resistors changed to 5 V logic.
This circuit, for automotive use, was found in a publication in 1975. The transistors are from...
This circuit was found in the National component manual which is not currently simple to obtain....
We found this circuit in an old American documentation. The operational amplifier is from the time...