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{
"metadata": {
"name": "",
"signature": "sha256:d81e43eab651aa6fd30f500bbb1e0bd8705caa6c96a13be542013eec088004c3"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 8 - IC Timer Circuits"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E1 - Pg 239"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Caption:Design a 555 monostable circuit\n",
"t=1.#Pulse width(in ms)\n",
"Vcc=15.#Supply voltage(in volts)\n",
"Ith=0.25#Threshold current(in micro Ampere)\n",
"Ic=100.*Ith\n",
"R=Vcc*1000./(3.*Ic)\n",
"C=t*10.**6./(1.*R)\n",
"print '%s %.f %s %.f' %('Components required for designing 555 monostable circuit are \\nR(in kilo ohm)=',R,'\\nC(in pF)=',C)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Components required for designing 555 monostable circuit are \n",
"R(in kilo ohm)= 200 \n",
"C(in pF)= 5000\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E2 - Pg 243"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#/Caption:Design a 555 astable multivibrator\n",
"p=2.#Pulse repetition frequency(in Khz)\n",
"d=0.66#Duty cycle\n",
"Ic=1.#Minimum collector voltage selected(in mA)\n",
"Vcc=18.#Supply voltage(in volts)\n",
"t=1000./p\n",
"t1=d*t\n",
"t2=t-t1\n",
"R=Vcc/(3*Ic)\n",
"C=t1*0.001/(0.693*R)\n",
"Rb=t2*0.001/(0.693*C)\n",
"Ra=R-Rb\n",
"print '%s %.1f %s %.2f %s %.2f' %('Components required to design the circuit are resistors \\nRa(in kilo ohm)=',3.3,'\\nRb(in kilo ohm)=',Rb,'\\nCapacitance(in micro farad)=',C)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Components required to design the circuit are resistors \n",
"Ra(in kilo ohm)= 3.3 \n",
"Rb(in kilo ohm)= 3.09 \n",
"Capacitance(in micro farad)= 0.08\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E3 - Pg 244"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Caption:Determine actual PRF and duty cycle\n",
"C=0.082#Capacitance(in micro farad)\n",
"Ra=3.3#Resistance(in kilo ohm)\n",
"Rb=2.7#Resistance(in kilo ohm)\n",
"t1=0.693*C*(Ra+Rb)*1000.\n",
"t2=0.693*C*Rb*1000.\n",
"T=t1+t2\n",
"P=1000./T\n",
"d=t1*100./T\n",
"print '%s %.f %s %.2f' %('Duty cycle(in %)=',d,'\\nPRF(in Khz)=',P)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Duty cycle(in %)= 69 \n",
"PRF(in Khz)= 2.02\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example E4 - Pg 254"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Caption:Design a square wave generator using 7555 CMOS\n",
"V=5.#Supply voltage(in volts)\n",
"f1=1.#Frequency(in khz)\n",
"f2=3.#Frequency(in khz)\n",
"C=0.01#Capacitance(in micro farad)\n",
"Ra=47.#Choosed resistor(in kilo ohm)\n",
"t1=1./(0.979*f1)\n",
"t2=1./(2.*f2)\n",
"R=t1/(0.693*C)\n",
"Rb=R-Ra\n",
"print '%s %.f %s %.f %s %.2f' %('Components required to design the circuit are \\nRa(in kilo ohm)=',Ra,'\\nRb(in kilo ohm)=',Rb,'\\nCapacitance(in micro farad)=',C)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Components required to design the circuit are \n",
"Ra(in kilo ohm)= 47 \n",
"Rb(in kilo ohm)= 100 \n",
"Capacitance(in micro farad)= 0.01\n"
]
}
],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
|
