Project report NOT Gate


Acknowledgement

Aim

Introduction

NOT gate truth table

Material required

Circuit Diagram

Working

Resources


Acknowledgement

I would like to express my special thanks of gratitude to my teacher (Name of the teacher) as well as our principal (Name of the principal)who gave me the golden opportunity to do this wonderful project on the topic (Write the topic name), which also helped me in doing a lot of Research and i came to know about so many new things I am really thankful to them.
Secondly i would also like to thank my parents and friends who helped me a lot in finalizing this project within the limited time frame.


Aim

Aim of this project is to demonstrate the working of  NOT gate using Transistor  and LED.


Introduction

The Logic NOT Gate is the most basic of all the logical gates and is often referred to as an Inverter. Inverting NOT gates are single input devise which have an output level that is normally at logic level “1” and goes “LOW” to a logic level “0” when its single input is at logic level “1”, in other words it “inverts” (complements) its input signal. The output from a NOT gate only returns “HIGH” again when its input is at logic level “0” giving us the Boolean expression of:  X =Z.

Then we can define the operation of a single input digital logic NOT gate as being:

“If X is NOT true, then Z is true”


NOT gate truth table

not gate truth table

Material required

Transistor:- Transistor is a semiconductor device that can both conduct and insulate. A transistor can act as a switch and an amplifier.
A transistor is a three terminal device. Namely,

  1. Base: This is responsible for activating the transistor.
  2. Collector: This is the positive lead.
  3. Emitter: This is the negative lead.
    Resistor:- The resistor is a passive electrical component to create resistance in the flow of electric current.
    LED:- An LED produces light when electricity flows through.
    Battery:- A 9V dc battery is used to power this circuit.
    Battery snap connector:- To connect the battery terminals to the rest of circuit.
    Soldering Iron:-  To solder the various components used in this project.
    Switches:- For controlling the input to the circuit


    Circuit Diagram

not gate circuit diagram


Working

There are two transistors used in this project i.e. T1 and T2. Input is provided to T1 through a switch, and T2 is always connected to the supply, hence transistor T2 is always in saturation mode.

  • When X=0
    When no input or zero input is given to T1 goes to cut-off mode hence all the current flow through T2 which turns the LED on. Hence Z=0
  • When x=1

When input is provided to T1, it goes to the saturation mode and current flows through T1 avoiding to flow through T2 (as current prefers low resistance path). When no current flows through T2 LED remains off. Hence Z=0


Resources