Switch OR gate – LED circuit

Or logic gate has an output that is off unless at least one of the inputs is on. Any on input provides a on output.

Basics

 

OR gate schematic symbol truth table diagram by electronzap electronzapdotcom
OR gate schematic symbol truth table diagram by electronzap electronzapdotcom


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Most OR gate circuits will use transistors or integrated circuits, but the switch version is easier to understand.

Schematic diagrams

Switch based basic OR gate schematic diragram by electronzap electronzapdotcom
Switch based basic OR gate schematic diragram by electronzap electronzapdotcom

The output/load is off unless one or all (input) switches are pressed.

Switch based OR gate with LED load demonstration circuit schematic diagram by electronzap electronzapdotcom
Switch based OR gate with LED load demonstration circuit schematic diagram by electronzap electronzapdotcom

Video

Electronics schematic to breadboard 3 tactile pushbutton switch AND and OR logic gates electronzap

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