Logic Gates Condition using Transistor

Introduction:

• Logic gates are the basic building blocks of any digital system. It is an electronic circuit having one or more than one input and only one output. The relationship between the input and the output is based on a certain logic.
• Based on this, logic gates are named as AND gate, OR gate, NOT gate, NAND gate, NOR gate, XOR gate, XNOR gate. In most logic gates, the low state is approximately zero volts (0 V), while the high state is approximately five volts positive (+5 V).
• now, i will show logic gate output using NPN and PNP transistor.

AND Gate Logic Using Transistor:

A

• after complete circuit connection (A).
• when switch A is press 0 and switch B is press 0, the LED is OFF
• when switch A is press 0 and switch B is press 1, the LED is OFF
• when switch A is press 1 and switch B is press 0, the LED is OFF
• when switch A is press 1 and switch B is press 1, the LED is ON

OR Gate Logic Using Transistor:

B

• after complete circuit connection (B).
• when switch A is press 0 and switch B is press 0, the LED is OFF
• when switch A is press 0 and switch B is press 1, the LED is ON
• when switch A is press 1 and switch B is press 0, the LED is ON
• when switch A is press 1 and switch B is press 1, the LED is ON

NOT Gate Logic Using Transistor:

C

• after complete circuit connection (C).
• when switch A is press 0, the LED is ON
• when switch A is press 1, the LED is OFF

NAND Gate Logic Using Transistor:

D

• after complete circuit connection (D).
• when switch A is press 0 and switch B is press 0, the LED is ON
• when switch A is press 0 and switch B is press 1, the LED is ON
• when switch A is press 1 and switch B is press 0, the LED is ON
• when switch A is press 1 and switch B is press 1, the LED is OFF

 NOR Gate Logic Using Transistor:

E

• after complete circuit connection (E).
• when switch A is press 0 and switch B is press 0, the LED is ON
• when switch A is press 0 and switch B is press 1, the LED is OFF
• when switch A is press 1 and switch B is press 0, the LED is OFF
• when switch A is press 1 and switch B is press 1, the LED is OFF

 Ex-OR Gate Logic Using Transistor:

F

• after complete circuit connection (F).
• when switch A is press 0 and switch B is press 0, the LED is OFF
• when switch A is press 0 and switch B is press 1, the LED is ON
• when switch A is press 1 and switch B is press 0, the LED is ON
• when switch A is press 1 and switch B is press 1, the LED is OFF

Ex-NOR Gate Logic Using Transistor:

G

• after complete circuit connection (G).
• when switch A is press 0 and switch B is press 0, the LED is ON
• when switch A is press 0 and switch B is press 1, the LED is OFF
• when switch A is press 1 and switch B is press 0, the LED is OFF
• when switch A is press 1 and switch B is press 1, the LED is ON