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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 8 - 555 Timer "
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 8.1 Page No.315"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given data \n",
+      "\n",
+      "R = 100*10**3\n",
+      "T = 100*10**-3\n",
+      "\n",
+      "# Solution \n",
+      "\n",
+      "C = T/(1.1*R)\n",
+      "\n",
+      "print \"The value of C =\",round(C*10**6,1),\"uF\"\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The value of C = 0.9 uF\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 8.2 Page No.322"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Given Data\n",
+      "\n",
+      "Ra = 6.8*10**3\n",
+      "Rb = 3.3*10**3\n",
+      "C = 0.1*10**-6\n",
+      "\n",
+      "# Solution \n",
+      "# Solution of part a\n",
+      "\n",
+      "tHIGH = round(0.69*(Ra + Rb)*C,5)*10**3\n",
+      "\n",
+      "# Solution pf part b\n",
+      "\n",
+      "tLOW = round(0.69*(Rb)*C,5)*10**3\n",
+      "\n",
+      "# Solution of part c\n",
+      "\n",
+      "f = int(1.45/((Ra + 2*Rb)*C))*10**-3\n",
+      "\n",
+      "# Solution for part d\n",
+      "\n",
+      "D = round(Rb/(Ra + 2*Rb),2)\n",
+      "\n",
+      "\n",
+      "# Displaying the answers \n",
+      "\n",
+      "print \"The value of tHIGH        =\",tHIGH,\"ms\"\n",
+      "print \"The value of tLOW         =\",tLOW,\"ms\"\n",
+      "print \"The value of frequency f  =\",f,\"kHz\"\n",
+      "print \"The value of Duty cycle D =\",D,\"or\",D*100,\"%\"  \n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The value of tHIGH        = 0.7 ms\n",
+        "The value of tLOW         = 0.23 ms\n",
+        "The value of frequency f  = 1.082 kHz\n",
+        "The value of Duty cycle D = 0.25 or 25.0 %\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file