AND gate OR gate and NOT gate

AND gate OR gate and NOT gate

Introduction:- Gate mean a door like concept through which some thing can pass or not pass. In digital electronics logical decisions can taken with the help of these gates. An example of logic is like, if person a and person b will come then only person c will perform. This is an example of AND logic. As a and b will present then only c will work. Similarly OR logic and NOT logic work. These logic can be simulate with the help of relay contacts or switches in circuit. in relay logic circuit huge circuit with number of contacts in series and parallel are used to develop complex logic to perform automatic operation of vary big machine/plant automation.With the advancement in electronics now transistors are used to develop different gates. These gates serves as the building blocks of  PLC  system and computer system.

AND Gate;- In AND gate there are 2 or 3 input points and one output point. As per number of input, it is said as 2 input AND gate or 3 input AND gate. The input output relation ship is shown with the help of table known as truth table. As the gate name suggest key word AND the output will only high (1) when all the inputs are high (1). If any of input is low (0) the output will low (0). In discrete components AND gate can be made with diode and transistor known as DTL logic. In ICs gates are made using only transistors is known as TTL logic.

OR gate:- In OR gate output is high if any one of input is high. Output will only low when all inputs are low. It mean if any one input is high output will high. This simulates OR relation ship between all inputs. Either input 1 is high or input 2 is high or input 3 is high output will be high. Example is switching on a light from either switch a or switch b.

NOT gate:- In this gate the output is negation of input means if input is low output is high or if input is high output is low.for example there are two pump in not logic then if pump a will run pump b will not run. or pump b run then pump a will not run. These logic can be programmed in PLC controller.

NOR gate:- If a not gate fixed at output of OR gate it becomes NOR gate.

NAND gate if a not gate is fixed at output of and gate it becomes NAND gate.

ExOR gate:- It is special OR gate it only give output high when exclusively one input is high. output will low if both inputs are high. this is very inportant as it serves to add binary number. first building block of digital computer known as half adder.

Please Like and comment for any doubt.

http://vijayelectronicsforu.blogspot.com/2018/07/uses-of-transistor-as-amplifier.html