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+{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# CHAPTER 4:ANALOG ELECTRONIC VOLT-OHM-MILLIAMMETER"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-1, Page Number 88"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "When E=10 V, meter current is 1 mA\n",
+ "\n",
+ "Input Impedance,\n",
+ "with transistor= 1.0 mega ohm\n",
+ "without transistor= 9.3 kilo ohm\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "Vcc=20 #Supply Voltage(V)\n",
+ "Rsm=9.3*10**3 #Rsm=Rs+Rm(ohm)\n",
+ "Im=1*10**-3 #Emitter Current(A)\n",
+ "hfe=100 #Transistor h parameter\n",
+ "Vb1=0.7 #Base Emitter Voltage drop(V)\n",
+ "#Calculation\n",
+ "#To obtain meter current when E=10V\n",
+ "E=10 #Base input voltage(V)\n",
+ "Ve=E-Vb1 #Emitter Voltage(V) found using KVL aclong base loop\n",
+ "Im=Ve/Rsm #Emitter current \n",
+ "\n",
+ "#With the transistor\n",
+ "Ib=Im/hfe #Base current is approximately equlat to Ie/hfe\n",
+ "Ri=E/Ib #Input resistance with transistor\n",
+ "\n",
+ "#Without transistor\n",
+ "Ri1=Rsm #Input resistance without transistor\n",
+ "\n",
+ "#Results\n",
+ "\n",
+ "print \"When E=10 V, meter current is\",int(Im*10**3),\"mA\"\n",
+ "print \n",
+ "print \"Input Impedance,\"\n",
+ "print \"with transistor=\",round(Ri/10**6),\"mega ohm\"\n",
+ "print \"without transistor=\",Ri1/10**3,\"kilo ohm\"\n",
+ "\n"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-2, Page Number 89"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "When E=0V, I2=I3= 2.9 mA\n",
+ "When E=1V, meter circuit voltage(V)= 1.0 V\n",
+ "When E=0.5, meter circuit voltage= 0.5 V\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "\n",
+ "R2=3.9*10**3 #in ohm\n",
+ "R3=3.9*10**3 #in ohm\n",
+ "Vcc=12 #in V\n",
+ "Vee=-12 #in V \n",
+ "Vbe=0.7 #Base Emitter voltage in V\n",
+ "\n",
+ "#Calculation \n",
+ "\n",
+ "#When E=0\n",
+ "E=0 \n",
+ "Vr2=E-Vbe-Vee #KVL \n",
+ "Vr3=E-Vbe-Vee #KVL\n",
+ "I2=Vr2/R2 #Ohm's Law\n",
+ "I3=I2 \n",
+ "\n",
+ "print \"When E=0V, I2=I3=\",round(I3*10**3,1),\"mA\"\n",
+ "\n",
+ "#When E=1\n",
+ "E=1 #in V\n",
+ "Vp=0 #in V\n",
+ "Ve1=E-Vbe #KVL\n",
+ "Ve2=Vp-Vbe #KVL\n",
+ "V=Ve1-Ve2 #KVL\n",
+ "print \"When E=1V, meter circuit voltage(V)=\",V,\"V\"\n",
+ "\n",
+ "#When E=0.5\n",
+ "E=0.5 #in V\n",
+ "Vp=0 #in V\n",
+ "Ve1=E-Vbe #KVL \n",
+ "Ve2=Vp-Vbe #KVL\n",
+ "V=Ve1-Ve2 #KVL \n",
+ "print \"When E=0.5, meter circuit voltage=\",V,\"V\"\n",
+ "\n"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-3, Page Number: 93"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 6,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "Im is 0.75 which is 75.0 % of full scale\n",
+ "As the meter is in 10V range, 75% of full scale is 7.5 V\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "\n",
+ "E=7.5 #in V\n",
+ "Vgs=-5 #FET gate source voltage in V\n",
+ "Vp=5 #in V\n",
+ "Rsm=1*10**3 #Rs+Rm in ohm\n",
+ "Im=1*10**-3 #in A\n",
+ "Ra=800*10**3 #in ohm\n",
+ "Rb=100*10**3 #in ohm\n",
+ "Rc=60*10**3 #in ohm\n",
+ "Rd=40*10**3 #in ohm\n",
+ "\n",
+ "Eg=E*(Rc+Rd)/(Ra+Rb+Rc+Rd) #Voltage Divider Rule \n",
+ "Vs=Eg-Vgs #KVL \n",
+ "\n",
+ "Ve1=Vs-Vbe #KVL \n",
+ "Ve2=Vp-Vbe #KVL\n",
+ "V=Ve1-Ve2 #KVL\n",
+ "Im=V/Rsm #Ohm's Law\n",
+ "\n",
+ "print \"Im is\",round(Im*10**3,2),\"which is\",round(Im*10**3,2)*100,\"% of full scale\"\n",
+ "print \"As the meter is in 10V range, 75% of full scale is\",10*0.75,\"V\""
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-4, Page Number: 97"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 11,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "R3= 100.0 ohm\n",
+ "R4= 4.9 kilo ohm\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "\n",
+ "Im=100*10**-6 #Full scale current in A\n",
+ "Rm=10*10**3 #Meter resistance in ohm \n",
+ "Ib=0.2*10**-6 #Op-amp input current in A\n",
+ "E=20*10**-3 #Maximum input in V\n",
+ "\n",
+ "#Calculations\n",
+ "\n",
+ "I4=1000*Ib #Since I4>>Ib\n",
+ "Vout=Im*Rm #Ohm's Law \n",
+ "\n",
+ "R3=E/I4 #Ohm's Law \n",
+ "R4=(Vout-E)/I4 #Ohm's Law\n",
+ "\n",
+ "#Results\n",
+ "\n",
+ "print \"R3=\",R3,\"ohm\"\n",
+ "print \"R4=\",round(R4*10**-3,1),\"kilo ohm\"\n",
+ "\n"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-5, Page Number: 98"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 12,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "R3= 1.0 kilo Ohm\n",
+ "Maximum voltage at output terminal= 1.1 V\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "E=1.0 #in V\n",
+ "I=1*10**-3 #in A\n",
+ "Rm=100 #in ohm\n",
+ "\n",
+ "R3=E/I #Ohm's Law\n",
+ "Vo=I*(R3+Rm) #Maximum Output voltage\n",
+ "\n",
+ "print \"R3=\",R3/1000,\"kilo Ohm\"\n",
+ "print \"Maximum voltage at output terminal=\",round(Vo,1),\"V\"\n",
+ "\n"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 4-7, Page Number: 107"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 13,
+ "metadata": {
+ "collapsed": false
+ },
+ "outputs": [
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "text": [
+ "R3= 45.0 ohm\n",
+ "When input is 50mV, meter deflection is 0.5 mA(half scale)\n"
+ ]
+ }
+ ],
+ "source": [
+ "import math\n",
+ "\n",
+ "#Variable Declaration\n",
+ "\n",
+ "Iav=1*10**-3 #in A \n",
+ "Rm=1.2*10**3 #in ohm\n",
+ "E=100*10**-3 #in V\n",
+ "\n",
+ "#With half wave rectifiers,\n",
+ "Ip=2*Iav/0.637 #Using relation between Ip and Iav for HWR\n",
+ "\n",
+ "#Peak value of Er3=input peak voltage\n",
+ "Ep=E/0.707 #Relation between peak voltage and rms \n",
+ "R3=Ep/Ip #in ohm\n",
+ "print \"R3=\",round(R3),\"ohm\"\n",
+ "\n",
+ "#When E=50mV\n",
+ "E=50*10**-3 #in V\n",
+ "Ep=E/0.707 #Peak Voltage in V \n",
+ "Ip=Ep/R3 #Peak current in A \n",
+ "\n",
+ "Iav=0.637*Ip/2 #Average Current in A\n",
+ "\n",
+ "print \"When input is 50mV, meter deflection is\",round(Iav*10**3,1),\"mA(half scale)\"\n"
+ ]
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 2",
+ "language": "python",
+ "name": "python2"
+ },
+ "language_info": {
+ "codemirror_mode": {
+ "name": "ipython",
+ "version": 2
+ },
+ "file_extension": ".py",
+ "mimetype": "text/x-python",
+ "name": "python",
+ "nbconvert_exporter": "python",
+ "pygments_lexer": "ipython2",
+ "version": "2.7.9"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}