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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 4 Op Amps as AC Amplifiers"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.1 page.no: 65"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "R1max=  140000.0\n",
+      "Xc1=R1/10 at F1\n",
+      "C1= 2.65258238486e-07  farad\n",
+      "C2= 8.16179195343e-07  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "# capacitor coupled voltage follower design \n",
+    "from math import pi\n",
+    "\n",
+    "Vbe =0.7\n",
+    "Ibmax =500*10**-9\n",
+    "R1max=0.1* Vbe/ Ibmax\n",
+    "print \"R1max= \",R1max\n",
+    "# assume R1=120Kohms\n",
+    "R1=120000\n",
+    "f1=50\n",
+    "print \"Xc1=R1/10 at F1\"\n",
+    "#  C1=1/(2∗pi∗f1∗(R1/10))\n",
+    "C1=1/(2*pi*f1*(R1/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "Rl=3900\n",
+    "C2=1/(2*pi*f1*Rl)\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.2 page.no: 66"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "C1= 3.18309886184e-08  farad\n",
+      "C2= 8.16179195343e-07  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "# capacitor coupled voltage follower design using BIFET \n",
+    "from math import pi\n",
+    "\n",
+    "R1 =1000000\n",
+    "f1=50\n",
+    "C1=1/(2*pi*f1*(R1/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "Rl=3900\n",
+    "C2=1/(2*pi*f1*Rl)\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.3 page.no: 68"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "C1= 4.681027738e-07  farad\n",
+      "C2= 4.681027738e-07  farad\n",
+      "Zin=  3400068000 ohms\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "#capacitor coupled voltage follower design \n",
+    "from math import pi \n",
+    "\n",
+    "Vbe =0.7\n",
+    "Ibmax =500*10**-9\n",
+    "R1max=0.1* Vbe/ Ibmax\n",
+    "R1=R1max/2\n",
+    "R2=R1\n",
+    "R1=68000\n",
+    "f1=50\n",
+    "C1=1/(2*pi*f1*(R1/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "C2=C1\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "Rl=3900\n",
+    "M=50000\n",
+    "Zin=(1+M)*R1\n",
+    "print \"Zin= \",Zin,\"ohms\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.4 page.no: 69"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "C1= 1.10524266036e-07  farad\n",
+      "C2= 6.02859632924e-07  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "#capacitor coupled non inverting amplifier design \n",
+    "#lower cut off frequency for the circuit =120Hz\n",
+    "from math import pi\n",
+    "\n",
+    "Vbe =0.7\n",
+    "Ibmax =500*10**-9\n",
+    "R1max=0.1* Vbe/ Ibmax\n",
+    "R1=120000\n",
+    "f1=120\n",
+    "C1=1/(2*pi*f1*(R1/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "Rl=2200\n",
+    "C2=1/(2*pi*f1*Rl)\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.5 page.no: 69"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "R1= 994974.874372\n",
+      "C2= 1.58359168376e-07  farad\n",
+      "C1=1000pF much larger than stray capacitance\n",
+      "C2= 6.63145596216e-07  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "#capacitor coupled non inverting high impedence follower design \n",
+    "#lower cut off frequency for the circuit =200Hz \n",
+    "from math import pi\n",
+    "\n",
+    "Vo=3\n",
+    "Vi=0.015\n",
+    "Av=Vo/Vi\n",
+    "R2 =1000000\n",
+    "R3=R2/(Av-1)\n",
+    "f1=200\n",
+    "R1=R2-R3\n",
+    "print\"R1=\",R1\n",
+    "C2=1/(2*pi*f1*(R3))\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "print \"C1=1000pF much larger than stray capacitance\"\n",
+    "Rl=12000\n",
+    "C2=1/(2*pi*f1*(Rl/10))\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.6 page.no: 71"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "C1= 0.000159154943092  farad\n",
+      "C2= 6.36619772368e-05  farad\n",
+      "Cf= 3.38627538493e-07  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "#capacitor coupled inverting amplifier design \n",
+    "#frequency range for the circuit =10Hz to 1KHz\n",
+    "from math import pi\n",
+    "R1 =1000\n",
+    "f1=10\n",
+    "C1=1/(2*pi*f1*(R1/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "Rl=250\n",
+    "C2=1/(2*pi*f1*Rl)\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "R2=47000\n",
+    "Cf=1/(2*pi*f1*R2)\n",
+    "print \"Cf=\",Cf,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## exa 4.7 page.no: 72"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "R1= 240000.0  ohms\n",
+      "R2= 240000.0  ohms\n",
+      "R4= 1000.0  ohms\n",
+      "R3= 99000.0  ohms\n",
+      "Rp= 114782.608696  ohms\n",
+      "C1= 1.84876954097e-07  farad\n",
+      "C2= 3.78940340695e-06  farad\n",
+      "C3= 2.12206590789e-06  farad\n",
+      "The circuit voltage should be normally between 9 to 18 volts\n"
+     ]
+    }
+   ],
+   "source": [
+    "#capacitor coupled non design\n",
+    "from math import pi\n",
+    "\n",
+    "Av =100.\n",
+    "Vcc =24.\n",
+    "Vo=5.\n",
+    "#lower cut off frequency for the circuit =75Hz\n",
+    "Vbe=0.7\n",
+    "Ibmax =500*10**-9\n",
+    "#I2>>Ibmax\n",
+    "I2 =100* Ibmax\n",
+    "R1=(Vcc/2)/I2\n",
+    "print\"R1=\",R1,\" ohms\"\n",
+    "R2=(Vcc/2)/I2\n",
+    "print\"R2=\",R2,\" ohms\"\n",
+    "#assume R1=220Kohms\n",
+    "Vi=Vo/Av\n",
+    "R1=220000.\n",
+    "I4 =100* Ibmax\n",
+    "R4=Vi/I4\n",
+    "print\"R4=\",R4,\" ohms\"\n",
+    "R3=(Vo/I4)-R4\n",
+    "print\"R3=\",R3,\" ohms\"\n",
+    "Rp=(R1*R2)/(R1+R2)\n",
+    "print\"Rp=\",Rp,\" ohms\"\n",
+    "f1=75.\n",
+    "C1=1/(2*pi*f1*(Rp/10))\n",
+    "print \"C1=\",C1,\" farad\"\n",
+    "Rl=5600.\n",
+    "C2=1/(2*pi*f1*(Rl/10))\n",
+    "print \"C2=\",C2,\" farad\"\n",
+    "C3=1/(2*pi*f1*R4)\n",
+    "print \"C3=\",C3,\" farad\"\n",
+    "print \"The circuit voltage should be normally between 9 to 18 volts\""
+   ]
+  }
+ ],
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+   "display_name": "Python 2",
+   "language": "python",
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