Normally you turn a switch on to turn the load/output on. A switch based NOT gate/digital inverter circuit is made so that the output/load is on while a mechanical switch is off. When the switch is turned on, then the output/load turns off.

This is just a demonstration circuit that helps you understand electronics better. There are integrated circuit digital inverters that make for a much more efficient NOT gate.

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Diagrams

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Lower diagram is not included in the video.

Video

Quick push button switch NOT gate demonstration schematic to breadboard electronics build



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