{
"cells": [
 {
		   "cell_type": "markdown",
	   "metadata": {},
	   "source": [
       "# Chapter 7: The 555 timer"
	   ]
	},
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.1: Monostable_Multivibrator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.1\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(R,'Resistance R(kohm)');\n",
"disp(C1,'Capacitance C1(micro F)');\n",
"disp(C2,'Capacitance C2(micro F)');\n",
"disp(R2,'Resistance R2(kohm)');\n",
"disp(C3,'Capacitance C3(micro F)');\n",
"//Answer of R2 is wrong in the book."
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.2: Value_of_R.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.2\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp(R,'Value of Resistance R(kohm)');"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.3: Astable_Multivibrator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.3\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(RA,'Resistance RA(kohm)');\n",
"disp(RB,'Resistance RB(kohm)');"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.4: Design_a_square_wave_generator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.4\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(RA,'Resistance RA(kohm)');\n",
"disp(RB,'Resistance RB(kohm)');\n",
"disp('RA & RB should be equal for 50% duty cycle.')"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.5: Astable_Multivibrator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.5\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(RA,'Resistance RA(kohm)');\n",
"disp(round(RB),'Resistance RB(kohm)');"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.6: Astable_Multivibrator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.6\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(round(RA),'Resistance RA(kohm)');\n",
"disp(round(RB),'Resistance RB(kohm)');"
   ]
   }
,
{
		   "cell_type": "markdown",
		   "metadata": {},
		   "source": [
			"## Example 7.7: Astable_Multivibrator.sce"
		   ]
		  },
  {
"cell_type": "code",
	   "execution_count": null,
	   "metadata": {
	    "collapsed": true
	   },
	   "outputs": [],
"source": [
"////Ex 7.7\n",
"clc;\n",
"clear;\n",
"close;\n",
"format('v',9);\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",
"disp('Design values are : ');\n",
"disp(C,'Capacitance C(micro F)');\n",
"disp(round(RA),'Resistance RA(kohm)');\n",
"disp(round(RB),'Resistance RB(kohm)');"
   ]
   }
],
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			{
			 "text": "MetaKernel Magics",
			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
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