Part of Made in India,Design Innovation

Workshop,2015

A  Fresh  New  Experience  in  

Project-­‐Making  and  Learning

PHYSICS INVESTIGATORY PROJECT ON

NAND GATE USING DIODES

Do  you  know  how  the  industrial  boilers  work?  The  boiler  circuit  will  acBvate  a  warning  lamp  if  either  its  water  sensor  or  its  gas  sensor  detects  a  low  level.  The  NAND  gates  will  help  you  infer  its  working;  it  has  two  inputs  (A  and  B)  and  only  one  output  (Q).

In  this  project,  you  will  make  a  NAND  gate  logic  circuit  using  two  diodes,  three  resistors,  an  LED  and  a  few  connecBng  wires.  Contrary  to  the  NOR-­‐gate,  in  this  case  the  p-­‐sides  of  the  two  diodes  are  connected  to  each  other  and  at  the  same  potenBal.  Two  connecBng  wires  are  connected  to  the  n-­‐sides  of  the  diodes.  Each  connecBng  wire  represents  the  input.  This  input  could  be  either  1  or  0,  where  1  stands  for  Vcc  (posiBve/high  voltage)  and  0  stands  for  ground  (negaBve/low  voltage).

To  provide  the  inputs;  the  truth  table  of  the  NAND-­‐gate  was  followed.

Input  A Input  B Output  Q0 0 10 1 11 0 11 1 0

On  providing  the  inputs,  if  the  LED  glows  this  means  output  Q  =  1  or  high.  If  the  LED  does  not  glow,  the  output  Q  =  0  or  low.  AVer  verifying  the  experimental  outputs  in  four  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  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,  innovaBon   and  high  producBon  value.  CoolJunk  has  been  featured   in   naBonal   and   internaBonal   journals   including   Wallstreet,   Yourstory,   Hindu   Business   Line,  NextBigWhat  and  was  tagged  as  the  coolest  Indian  start-­‐up  in  IAN  Bootcamp-­‐2011.  

You  may  also  refer  to  the  video:  NAND  GATEFor  more  projects  visit  our  website:  CoolJunk  

Tools  and  Components  in  one  box.

Step  by  step  visual  instrucBons

Detailed  experiment  theory

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