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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 6 : Voltage Regulators"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.1 Page No.246"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data \n",
"\n",
"Veb = 1.0\n",
"beta = 15.0\n",
"Vc = 5.0\n",
"Io = 1.0 # for 7805 maximum value of I b is 1 Ampere \n",
"R1 = 7.0\n",
"# Solution \n",
"\n",
"# for Load = 100ohms \n",
"\n",
"Rl = 100.0\n",
"\n",
"Il=Ic=Ii = Vc/Rl\n",
"# voltage across R1\n",
"V1 = R1*(50*10**-3)\n",
"# for load = 5 ohms\n",
"\n",
"Rl1 = 5.0\n",
"Il1 = Vc/Rl1\n",
"V12 = Il1 * Rl1 # Finding the Voltage drop across R1 when Rl = 5 Ohms \n",
"# Finding the value of Io\n",
"Io = (Il1 + (beta*(Veb/R1)))/(beta + 1)\n",
"Ic = beta*(Io - (Veb/R1))\n",
"\n",
"# for load = 1 Ohm\n",
"\n",
"Rl2 = 1.0\n",
"Il2 = Vc/Rl2\n",
"# Finding the value of Io\n",
"Io1 = (Il2 + (beta*(Veb/R1)))/(beta + 1)\n",
"Ic1 = beta*(Io1 - (Veb/R1))\n",
"\n",
"print \" The value of load current when Rl = 100 ohms is =\",int(Il*10**3),\"mA\"\n",
"print \" The voltage across R1 when load is 100 ohms =\",int(V1*10**3),\"mV\"\n",
"print \" The value of load current when Rl = 5 ohms =\",int(Il1),\"A\"\n",
"print \" The voltage across R1 when load is 5 Ohms =\",int(V12),\"V\"\n",
"print \" The value of output current when load is 5 ohms =\",int(Io*10**3),\"mA\"\n",
"print \" The value of collector current is =\",int(round(Ic*10**3)),\"mA\"\n",
"print \" The value of output current when load is 1 Ohm =\",int(Io1*10**3),\"mA\"\n",
"print \" The value of collector current is =\",round(Ic1,2),\"A\" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" The value of load current when Rl = 100 ohms is = 50 mA\n",
" The voltage across R1 when load is 100 ohms = 350 mV\n",
" The value of load current when Rl = 5 ohms = 1 A\n",
" The voltage across R1 when load is 5 Ohms = 5 V\n",
" The value of output current when load is 5 ohms = 196 mA\n",
" The value of collector current is = 804 mA\n",
" The value of output current when load is 1 Ohm = 446 mA\n",
" The value of collector current is = 4.55 A\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.2 Page No.247"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Given data\n",
"\n",
"Vo = 7.5\n",
"Iq = 4.2*10**-3\n",
"Ir1 = 25*10**-3\n",
"Vr = 5\n",
"\n",
"# Solution \n",
"\n",
"R1 = Vr/Ir1\n",
"R2 = 2.5/(Ir1 + Iq)\n",
"\n",
"# Displaying the outputs \n",
"\n",
"print \"The value of R1 =\",int(R1),\"Ohms\" \n",
"print \"The value of R2 =\",int(R2),\"Ohms\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The value of R1 = 200 Ohms\n",
"The value of R2 = 85 Ohms\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
