Part of Made in India,Design Innovation

Workshop,2015

A  Fresh  New  Experience  in  Project-­‐Making  &  Learning!

PHYSICS INVESTIGATORY PROJECT ON

TRANSISTOR AS AN INVERTER (NOT GATE)

A  NOT  gate  also  known  as  an  inverter  is  an  electronic  circuit  that  performs  nega9on  i.e.,  the  output  of  the  NOT  gate  is  low,  if  the  input  is  high  and  vice  versa.  Mul9plexers,  decoders,  state  machines,  and  other  sophis9cated  digital  devices  use  inverters. The  NOT  gate  has  one  only  input  (A)  and  one  output  (Q).  You  can  make  a  NOT  gate  project  and  see  how  it  inverts  the  given  input.

In  this  project,  you  will  make  an  NOT  gate  logic  circuit  using  a  transistor,  three  resistors,  an  LED  and  a  few  connec9ng  wires.  The  connec9ons  are  made  such  that,  the  emiIer  of  the  transistor  is  grounded  and  .an  input  wire  is  connected  to  the  leJ  leg  of  the  base  resistor.  This  input  could  be  either  1  or  0,  where  1  stands  for  Vcc  (posi9ve/high  voltage)  and  0  stands  for  ground  (nega9ve/low  voltage).

To  provide  the  respec9ve  inputs,  the  truth  table  of  NOT  gate  is  followed.  

Input  A   Output  Q0 11 0

On  providing  the  input,  if  the  LED  glows  this  means  output  Q  =  1  or  high.  If  the  LED  does  not  glow,  the  output  Q  =  0  or  low.  AJer  verifying  the  experimental  outputs  in  two  different  cases  of  the  inputs,  we  do  the  ‘path  of  current’  analysis  and  reason  out  why  the  LED  glows  in  each  case.

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