A transistor is a semiconductor device that can conduct as well as insulate electric current or voltage. A transistor serves as both a switch and an amplifier. In layman's terms, a transistor is a small device used to control or regulate the flow of electronic impulses.
AND gate using transistor. A & B are input tom the transistors.
The Logic AND Gate is a digital logic circuit whose output is high to logic level 1 only when all of its inputs are high.
The Logic NAND Gate is a series combination of a digital logic AND gate and a NOT gate.
The NOT gate has a single input and a single output. This gate is also known as an inverter since it inverts the applied binary signal.
Draw a diagram,
Therefore,
By connecting transistors, diodes, and resistors, AND gates and NAND gates can be created.
By adding a NOT circuit, an AND gate can be transformed into a NAND gate.