Xor Gate Circuit Diagram Using Transistor. The above circuit diagram shows the simplest way to build an or gate using npn transistors. What you need a breadboard a bunch of 5k and 10k resistors and transistors a led you can use any npn type transistor for example 2n3904 bc547 bc548 bc549 etc these are basic circuits so they can be improved with diodes for reverse voltage protection for example or can be simplified xor xnor gates.
You can find circuits using 4 6 8 9 10 or 12 transistors again with varied strengths for the inputs and the output. That is the fact that if both of the inputs are ones then the output is also a one. The first version of the or gate is the simplest one it consists of two paralleled emitter followers sharing a common emitter resistor.
Or gates are very useful but they have one odd feature that can work just fine but in certain applications can cause problems.
The xor gate we just built is a neat application of this idea. For example pass transistor logic transmission gates makes it pretty simple. Thus an approximate logic high voltage v h 0 6v v ce is available at output terminal y. If we had an application where we d.
