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{
"metadata": {
"name": "",
"signature": "sha256:da9731a08909e4ad4cafbaaa3667ca4e507b854221c0c6168fb27a7fc7f1c9cc"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter7 - The 555 timer"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.1 - page : 233"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"th=4 #ms\n",
"VCC=10 #V\n",
"C=0.05 #micro F(choosen between 0.01<=C<=1)\n",
"R=th*10**-3/(1.1*C*10**-6)/1000 #kohm\n",
"C1=0.01 #micro F(assumed)\n",
"C2=0.01 #micro F(choosen between 0.01<=C<=1)\n",
"R2=th*10**-3/(10*C2*10**-6)/1000 #kohm\n",
"C3=10 #micro F\n",
"print \"Design values are : \"\n",
"print \"Capacitance C = %0.2f micro F \" %C \n",
"print \"Resistance R = %0.1f kohm \" %R \n",
"print \"Capacitance C1 = %0.2f micro F \" %C1 \n",
"print \"Capacitance C2 = %0.2f micro F \" %C2 \n",
"print \"Resistance R2 = %0.2f kohm \" %R2 \n",
"print \"Capacitance C3 = %0.2f micro F \" %C3 \n",
"#Answer of R2 is wrong in the book."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C = 0.05 micro F \n",
"Resistance R = 72.7 kohm \n",
"Capacitance C1 = 0.01 micro F \n",
"Capacitance C2 = 0.01 micro F \n",
"Resistance R2 = 40.00 kohm \n",
"Capacitance C3 = 10.00 micro F \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.2 - page : 236"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"ft=2 #kHz\n",
"C=0.01 #micro F\n",
"T=1/ft #ms\n",
"n=3 #for divide-by-3 circuit\n",
"th=(0.2+(n-1))*T #ms\n",
"R=th/(1.1*C) #kohm\n",
"print \"Value of Resistance R = %0.2f kohm \" %R"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Value of Resistance R = 100.00 kohm \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.3 - page 239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"fo=2 #kHz\n",
"D=70 #%(duty cycle)\n",
"T=1/fo #ms\n",
"VCC=12 #V\n",
"tC=D*T/100 #ms\n",
"tD=T-tC #ms\n",
"C=0.05 #micro F(choosen between 0.01<=C<=1)\n",
"RB=tD*10**-3/(0.69*C*10**-6)/1000 #kohm\n",
"RA=tC*10**-3/(0.69*C*10**-6)/1000-RB #kohm\n",
"print \"Design values are : \"\n",
"print \"Capacitance C = %0.2f micro F \" %C \n",
"print \"Resistance RA = %0.1f kohm \" %RA \n",
"print \"Resistance RB = %0.1f kohm \" %RB\n",
"#Answer is not accurate in the textbook."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C = 0.05 micro F \n",
"Resistance RA = 5.8 kohm \n",
"Resistance RB = 4.3 kohm \n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.4 : page 243"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"fo=2 #kHz\n",
"D=50 #%(duty cycle)\n",
"T=1/fo #ms\n",
"VCC=10 #V\n",
"tC=D*T/100 #ms\n",
"tD=T-tC #ms\n",
"C=0.1 #micro F(choosen between 0.01<=C<=1)\n",
"RB=tD*10**-3/(0.69*C*10**-6)/1000 #kohm\n",
"RA=T*10**-3*1.45/(C*10**-6)/1000-RB #kohm\n",
"print \"Design values are : \"\n",
"print \"Capacitance C= %0.2f micro F \" %C \n",
"print \"Resistance RA = %0.1f kohm \" % RA \n",
"print \"Resistance RB = %0.1f kohm \" %RB \n",
"# RA & RB should be equal for 50% duty cycle."
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C= 0.10 micro F \n",
"Resistance RA = 3.6 kohm \n",
"Resistance RB = 3.6 kohm \n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.5 - page : 244"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"fo=2 #kHz\n",
"D=40 #%(duty cycle)\n",
"T=1/fo #ms\n",
"VCC=10 #V\n",
"tC=D*T/100 #ms\n",
"tD=T-tC #ms\n",
"C=0.22 #micro F(choosen between 0.01<=C<=1)\n",
"RB=tD*10**-3/(0.69*C*10**-6)/1000 #kohm\n",
"RA=T*10**-3*1.45/(C*10**-6)/1000-RB #kohm\n",
"print \"Design values are : \" \n",
"print \"Capacitance C = %0.2f micro F \" %C \n",
"print \"Resistance RA = %0.1f kohm \" %RA \n",
"print \"Resistance RB = %0.f kohm \" %round(RB) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C = 0.22 micro F \n",
"Resistance RA = 1.3 kohm \n",
"Resistance RB = 2 kohm \n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.6 - page : 245"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"fo=700 #Hz\n",
"D=50 #%(duty cycle)\n",
"T=1/fo*1000 #ms\n",
"VCC=10 #V\n",
"tC=D*T/100 #ms\n",
"tD=T-tC #ms\n",
"C=0.05 #micro F(choosen between 0.01<=C<=1)\n",
"RB=tD*10**-3/(0.69*C*10**-6)/1000 #kohm\n",
"RA=T*10**-3*1.45/(C*10**-6)/1000-RB #kohm\n",
"print \"Design values are : \"\n",
"print \"Capacitance C = %0.2f micro F \" %C \n",
"print \"Resistance RA = %0.2f kohm \" %round(RA) \n",
"print \"Resistance RB = %0.2f kohm \" %round(RB) "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C = 0.05 micro F \n",
"Resistance RA = 21.00 kohm \n",
"Resistance RB = 21.00 kohm \n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Ex 7.7 - page : 246"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"fo=800 #Hz\n",
"D=60 #%(duty cycle)\n",
"T=1/fo*1000 #ms\n",
"VCC=10 #V\n",
"tC=D*T/100 #ms\n",
"tD=T-tC #ms\n",
"C=0.047 #micro F(choosen between 0.01<=C<=1)\n",
"RB=tD*10**-3/(0.69*C*10**-6)/1000 #kohm\n",
"RA=tC*10**-3*1.45/(C*10**-6)/1000-RB #kohm\n",
"print \"Design values are : \"\n",
"print \"Capacitance C = %0.3f micro F \" %C \n",
"print \"Resistance RA = %0.2f kohm \" %round(RA) \n",
"print \"Resistance RB = %0.2f kohm \" %round(RB)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Design values are : \n",
"Capacitance C = 0.047 micro F \n",
"Resistance RA = 8.00 kohm \n",
"Resistance RB = 15.00 kohm \n"
]
}
],
"prompt_number": 14
}
],
"metadata": {}
}
]
}
|
