The Wired or Connection
The wired OR connection electrically performs the Boolean logic operation of an OR gate, using a pull down resistor and one diode per input.
Voltage from any input is directed through its corresponding diode directly to the output C. If no voltage/logic exists on any input there will be no output. The positive voltage source that is present in the AND connection is replaced by a ground in the OR connection. Also, notice the positioning of the diodes as compared to the AND gate. Similarly, the OR connection is capable of an infinite number of inputs and only one output.
The output C is determined by the inputs at A and B according to the truth table (not shown) and square wave (below).
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