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Part of Made in India,
Design Innovation
Workshop,2015
A	
  Fresh	
  New	
  Experience	
  in	
  
Project-­‐Making	
  &	
  Learning!
PHYSICSINVESTIGATORY
PROJECTON
TRANSISTORASANINVERTER
(NOTGATE)
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	
  Q
0 1
1 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.
Have	
  a	
  look	
  at	
  what	
  we	
  provide	
  in	
  our	
  Project	
  Kit!
CoolJunk	
   is	
   India's	
   fastest	
  growing	
  DIY	
  (do-­‐it-­‐yourself)	
   kits	
   company	
   focused	
   on	
   project-­‐based	
   learning	
   in	
  
science,	
  engineering	
  and	
   technology.	
  Having	
   20,000	
   users	
   in	
   India,	
  US,	
   Singapore,	
   Middle	
   East	
   and	
   New	
  
Zealand,	
  the	
  CoolJunk	
  kits	
  are	
  known	
  for	
  quality,	
  innovaVon	
  and	
  high	
  producVon	
  value.	
  CoolJunk	
  has	
  been	
  
featured	
   in	
   naVonal	
   and	
   internaVonal	
   journals	
   including	
   Wallstreet,	
   Yourstory,	
   Hindu	
   Business	
   Line,	
  
NextBigWhat	
  and	
  was	
  tagged	
  as	
  the	
  coolest	
  Indian	
  start-­‐up	
  in	
  IAN	
  Bootcamp-­‐2011.	
  
For	
  more	
  projects	
  visit	
  our	
  website:	
  CoolJunk	
  
All	
  tools	
  and	
  components	
  
in	
  one	
  box.
Step	
  by	
  step	
  visual	
  
instrucVons
Detailed	
  experiment	
  
theory
CoolJunkCoolJunkCoolJunk
Follow	
  us	
  on:
CoolJunk

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Physics Investigatory Project on Transistor as an Inverter (NOT Gate).

  • 1. Part of Made in India, Design Innovation Workshop,2015 A  Fresh  New  Experience  in   Project-­‐Making  &  Learning!
  • 3. 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  Q 0 1 1 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.
  • 4. Have  a  look  at  what  we  provide  in  our  Project  Kit! CoolJunk   is   India's   fastest  growing  DIY  (do-­‐it-­‐yourself)   kits   company   focused   on   project-­‐based   learning   in   science,  engineering  and   technology.  Having   20,000   users   in   India,  US,   Singapore,   Middle   East   and   New   Zealand,  the  CoolJunk  kits  are  known  for  quality,  innovaVon  and  high  producVon  value.  CoolJunk  has  been   featured   in   naVonal   and   internaVonal   journals   including   Wallstreet,   Yourstory,   Hindu   Business   Line,   NextBigWhat  and  was  tagged  as  the  coolest  Indian  start-­‐up  in  IAN  Bootcamp-­‐2011.   For  more  projects  visit  our  website:  CoolJunk   All  tools  and  components   in  one  box. Step  by  step  visual   instrucVons Detailed  experiment   theory CoolJunkCoolJunkCoolJunk Follow  us  on: CoolJunk