NOT logic gate electronics digital signal inverter

NOT logic gates, also called inverters, take an input voltage classified as either high (often 5V) or low (usually 0V) and outputs the opposite situation. So accordingly, a high input results in a low outsput. While, a low input results in a high output.

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  • High input = low output.
  • Low input = high output.

NOT gate aka digital signal inverter explained using switch and 2N3904 NPN BJT transistor

NPN Transistor NOT Gate as a signal inverter circuit video diagram
NPN Transistor NOT Gate as a signal inverter circuit video diagram

NOT logic gate demo circuit made with electronics momentary tactile push button switch video below: Click here to watch directly on YouTube!

Not logic gate demonstration circuit using 2N2222 NPN Bipolar Junction Transistor BJT video below: Click here to watch directly on YouTube!

NOT Gate hex inverter integrated circuit SN74HC04N demonstration and voltage measurements video below: Click here to watch directly on YouTube!


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