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diff --git a/sample_notebooks/SandeshNaik/ch3.ipynb b/sample_notebooks/SandeshNaik/ch3.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:ab5dad51b8bb4848e05fe479e673fa81caef98b1e0130b3768c6e1580871f987"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 3: Negative Feedback"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.1, Page 75"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "Aol=200;\n",
+      "f2_ol=10000;     # in Hz\n",
+      "B=0.04;\n",
+      "\n",
+      "#Calculations&Results\n",
+      "Asp=Aol/(1+B*Aol);\n",
+      "print \"Asp %.2f \\n \"%Asp;            #Result\n",
+      "print \"Approximately Asp =1/B equal to %.0f \\n\"%(1/B);#result\n",
+      "S=Aol/Asp;\n",
+      "print \"S =%.0f \\n\"%S;\n",
+      "f2_sp=f2_ol*S;\n",
+      "print \"f2_sp %.0f Hz\"%f2_sp;       #Result"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Asp 22.22 \n",
+        " \n",
+        "Approximately Asp =1/B equal to 25 \n",
+        "\n",
+        "S =9 \n",
+        "\n",
+        "f2_sp 90000 Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.2, Page 76"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "Asp1=20.\n",
+      "Asp=10**(Asp1/20);\n",
+      "\n",
+      "#Calculations&Results\n",
+      "print \"Asp =%.0f\\n\"%Asp;#Result\n",
+      "#Rf/Ri=Asp-1;\n",
+      "print \"Rf/Ri=%.0f \\n\"%(Asp-1);#Result\n",
+      "print \"Rf must be 9 times larger than Ri. \\n There are many possibilities  \";#Result"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Asp =10\n",
+        "\n",
+        "Rf/Ri=9 \n",
+        "\n",
+        "Rf must be 9 times larger than Ri. \n",
+        " There are many possibilities  \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.3, Page 82"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "Zin_ol=300*10**3;       #in Ohms\n",
+      "Zout=100;       #in Ohms\n",
+      "Aol=50000.;\n",
+      "Zout_ol=100.;\n",
+      "Asp=100;\n",
+      "\n",
+      "#Calculations&Results\n",
+      "S=Aol/Asp;\n",
+      "print \"S = %.0f\"%S;#Result\n",
+      "Zin_sp=S*Zin_ol;\n",
+      "print \"Zin_sp = %.0f Ohm\"%Zin_sp;#Result\n",
+      "Zout_sp=Zout_ol/S;\n",
+      "print \"Zout_sp = %.1f Ohm\"%Zout_sp;#Result\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "S = 500\n",
+        "Zin_sp = 150000000 Ohm\n",
+        "Zout_sp = 0.2 Ohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.4, Page 88"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Variable declaration\n",
+      "R1=9000;        # in Ohm\n",
+      "R2=1000.;        #in Ohm\n",
+      "\n",
+      "#Calculations&Results\n",
+      "B=R2/(R1+R2);\n",
+      "print \"B is %.2f\\n\"%B;#Result\n",
+      "#Aps=1/B;\n",
+      "Aps=(R1+R2)/R2;\n",
+      "print \"Aps = %.0f \\n \"%Aps;#Result"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "B is 0.10\n",
+        "\n",
+        "Aps = 10 \n",
+        " \n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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