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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 8: IC timer circuits"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.1: Design_a_555_monostable_circuit.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption:Design a 555 monostable circuit\n",
+"//Ex8.1\n",
+"clc;\n",
+"clear;\n",
+"close;\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/(1.1*R)\n",
+"disp(C,R,'Components required for designing 555 monostable circuit are R(in kilo ohm) and C(in pF)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.2: Design_a_555_astable_multivibrator.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption:Design a 555 astable multivibrator\n",
+"//Ex8.2\n",
+"clc;\n",
+"clear;\n",
+"close;\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",
+"disp(C,Rb,Ra,'Components required to design the circuit are resistors Ra,Rb(in kilo ohm) and Capacitance(in micro farad)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.3: Determine_actual_PRF_and_duty_cycle.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption:Determine actual PRF and duty cycle\n",
+"//Ex8.3\n",
+"clc; \n",
+"clear;\n",
+"close;\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",
+"disp(P,d,'Duty cycle(in %) and PRF(in Khz)=')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 8.4: Design_a_square_wave_generator_using_7555_CMOS.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Caption:Design a square wave generator using 7555 CMOS\n",
+"//Ex8.4\n",
+"clc;\n",
+"clear;\n",
+"close;\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/(2*f1)\n",
+"t2=1/(2*f2)\n",
+"R=t1/(0.693*C)\n",
+"Rb=R-Ra\n",
+"disp(C,Rb,Ra,'Components required to design the circuit are Ra,Rb(in kilo ohm) and Capacitance(in micro farad)=')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}