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diff --git a/Electronic_Circuits_by_M._H._Tooley/Chapter9_2.ipynb b/Electronic_Circuits_by_M._H._Tooley/Chapter9_2.ipynb
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@@ -0,0 +1,127 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:e9fb88f63f2c9c2769603c77ea25313f638342259fa02ac4950a18408033aeb6"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter9-Oscillators"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg173"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "##Ex:9.1\n",
+      "import math\n",
+      "C=10.*10**-9;\n",
+      "R=10000.;\n",
+      "f=(1./(2.*math.pi*math.sqrt (6.)*C*R));\n",
+      "print'%s %.2f %s'%(\"The freq of oscillation = \",f,\" Hz\");\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The freq of oscillation =  649.75  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg173"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "##Ex:9.2\n",
+      "import math\n",
+      "r1=1000.;\n",
+      "r2=1000.;\n",
+      "c=100.*10**-9;\n",
+      "f=(1./(2.*math.pi*c*r1));\n",
+      "print'%s %.2f %s'%(\"The freq of oscillation at 1 kohm= \",f,\" Hz\");\n",
+      "R1=6000.;\n",
+      "R2=6000.;\n",
+      "F=(1/(2.*math.pi*c*R1));\n",
+      "print'%s %.2f %s'%(\"\\nThe freq of oscillation at 6 kohm= \",F,\" Hz\");"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The freq of oscillation at 1 kohm=  1591.55  Hz\n",
+        "\n",
+        "The freq of oscillation at 6 kohm=  265.26  Hz\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg176"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "##Ex:9.3\n",
+      "import math\n",
+      "f=1000.;\n",
+      "t=1./f;\n",
+      "C=10.*10**-9;\n",
+      "R=t/(1.4*C);\n",
+      "print'%s %.2f %s'%(\"R= \",R/1000,\" kohm\");"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "R=  71.43  kohm\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file