LOGIC GATES USING TRANSISTOR

Earlier we see how to make Logic Gates using Switches and Symbols, Truth Table of Logic Gates. Now we see how to make logic gates using transistor.

One more interesting thing is IC’s are made of logic circuits and logic circuits are made up of logic gates, So basically IC’s have capacitors, resistor & transistors on chip for logical circuits, that’s why IC’s understand logic 1 & 0 as logic high and low only.

LOGIC GATES USING TRANSISTOR

Here we are using transistor as switch and controlling base signal using button so that we can control and see logic given to base.

NOT GATE USING TRANSISTOR

NOT using transistor works similar as NOT gate using switch. we need 1 input device and 1 output device those are button and led respectively.

Initially when button is open circuited, Transistor wouldn’t allow to pass signal through the emitter. So only path remains for current to reach to the ground is collector i.e. through LED. In this case LED glows.

When we press button it activates it’s base and maximum current pass through emitter rather than collector. In this case LED not glows.

 

NOT Gate Using NPN Transistor
NOT Gate Using NPN Transistor

AND GATE USING TRANSISTOR

AND using transistor works similar as AND gate using switch. we need 2 inputs and 1 output device those are buttons and led respectively.

Switches are connected in series in AND Gate using switch, same as it we connected transistor in series, so that until both buttons are not closed, LED will not glows.

AND Gate Using NPN Transistor
AND Gate Using NPN Transistor

OR GATE USING TRANSISTOR

OR using transistor works similar as OR gate using switch. we need 2 inputs and 1 output device those are buttons and led respectively.

Switches are connected in paralle in OR Gate using switch, same as it we connected transistor in parallel, so that any one of the buttons get closed, LED will glows.

OR Gate using NPN Transistor
OR Gate using NPN Transistor

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