A real inverter - as the simplest logic gate - is made of a bunch of transistors, diodes and resistors.
But even with a single transistor circuit you can reverse the input signal with 180 degrees to the output.
In order to keep the story shorter, I may have taken a couple of shortcuts in my video.
For the rough understanding of the TTL meaning anyway, we should be good enough for now.
More details will emerge of course as we advance with the gates.
Thanks for watching and CU next Tuesday!
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