Added(A)/Deleted(D) following books

 A  Electrical_Engineering_Fundamentals_by__Del_Toro_Vincent_/README.txt
A  Electronic_Devices_And_Circuits_by_B._Kumar_And_S._B._Jain/README.txt
A  Fiber_Optics_and_Optoelectronics_by_R._P._Khare/README.txt
A  testing_by_test/README.txt
A  testing_by_test/muktesh.ipynb
A  testing_by_test/screenshots/screenshot6.png
A  testing_by_test/screenshots/screenshot6_1.png
A  testing_by_test/screenshots/screenshot6_2.png

8 files changed, 186 insertions, 0 deletions

diff --git a/Electrical_Engineering_Fundamentals_by__Del_Toro_Vincent_/README.txt b/Electrical_Engineering_Fundamentals_by__Del_Toro_Vincent_/README.txt
new file mode 100644
index 00000000..8bce4e2b
--- /dev/null
+++ b/Electrical_Engineering_Fundamentals_by__Del_Toro_Vincent_/README.txt
@@ -0,0 +1,10 @@
+Contributed By: Tarunika Boyapati
+Course: btech
+College/Institute/Organization: Alliance University
+Department/Designation: ECE
+Book Title: Electrical Engineering Fundamentals
+Author:  Del Toro Vincent 
+Publisher: Prentice Hall, International
+Year of publication: 2009
+Isbn: 978-8120305991
+Edition: 2
\ No newline at end of file
diff --git a/Electronic_Devices_And_Circuits_by_B._Kumar_And_S._B._Jain/README.txt b/Electronic_Devices_And_Circuits_by_B._Kumar_And_S._B._Jain/README.txt
new file mode 100644
index 00000000..42292a83
--- /dev/null
+++ b/Electronic_Devices_And_Circuits_by_B._Kumar_And_S._B._Jain/README.txt
@@ -0,0 +1,10 @@
+Contributed By: Haseen 
+Course: btech
+College/Institute/Organization: Growth Associates
+Department/Designation: ME
+Book Title: Electronic Devices And Circuits
+Author: B. Kumar And S. B. Jain
+Publisher: PHI Learning Pvt. Ltd., New Delhi
+Year of publication: 2007
+Isbn: 978-81-203-2981-2
+Edition: 1
\ No newline at end of file
diff --git a/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/README.txt b/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/README.txt
new file mode 100644
index 00000000..494a6821
--- /dev/null
+++ b/Fiber_Optics_and_Optoelectronics_by_R._P._Khare/README.txt
@@ -0,0 +1,10 @@
+Contributed By: Vidur Sirohi
+Course: btech
+College/Institute/Organization: Imax Tracking Solutions
+Department/Designation: GET
+Book Title: Fiber Optics and Optoelectronics
+Author: R. P. Khare
+Publisher: Oxford Press, New Delhi
+Year of publication: 2009
+Isbn: 0-19-566930-4
+Edition: 8
\ No newline at end of file
diff --git a/testing_by_test/README.txt b/testing_by_test/README.txt
new file mode 100644
index 00000000..fdceeb95
--- /dev/null
+++ b/testing_by_test/README.txt
@@ -0,0 +1,10 @@
+Contributed By: asmita asmita
+Course: mtech
+College/Institute/Organization: sd
+Department/Designation: sd
+Book Title: testing
+Author: test
+Publisher: sdf
+Year of publication: 3
+Isbn: 3
+Edition: 3
\ No newline at end of file
diff --git a/testing_by_test/muktesh.ipynb b/testing_by_test/muktesh.ipynb
new file mode 100644
index 00000000..1b9503fc
--- /dev/null
+++ b/testing_by_test/muktesh.ipynb
@@ -0,0 +1,146 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter 5: Sequential Circuits, Flip flops & Multivibrators"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 1, Page 183"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Required time=1.1 milli-seconds\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Variable declaration\n",
+    "R=10*10**3;#external resistance ohm#\n",
+    "C=0.1*10**-6;#timing capacitor Farad#\n",
+    "\n",
+    "#Calculations\n",
+    "T=1.1*R*C;#time for which output remains high in monostable multivibrator using IC 555 timer#\n",
+    "\n",
+    "#Result\n",
+    "print \"Required time=%.1f milli-seconds\"%(T*10**3)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 2, Page 183"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "frequency=48.10 KH\n",
+      "duty cycle=33.33 percent\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Variable declaration\n",
+    "Ra=10*10**3  #ohms\n",
+    "Rb=10*10**3  #ohms\n",
+    "C=.001*10**-6 #F\n",
+    "\n",
+    "#Calculations&Results\n",
+    "T1=.693*(Ra+Rb)*C;#charging time constant#\n",
+    "T2=.693*Rb*C;#discharging time constant#\n",
+    "T=T1+T2;#total time#\n",
+    "f=1./T;#frequency#\n",
+    "print 'frequency=%.2f KH'%(f*10**-3);\n",
+    "D=T2/T;#duty cycle#\n",
+    "D=D*100\n",
+    "print 'duty cycle=%.2f percent'%D\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 3, Page 184"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "frequency=1.077 KH\n",
+      "duty cycle=24.63 percent\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Variable declaration\n",
+    "Ra=6.8*10**3  #ohms\n",
+    "Rb=3.3*10**3  #ohms\n",
+    "C=.1*10**-6   #F\n",
+    "\n",
+    "#Calculations&Results\n",
+    "T1=.693*(Ra+Rb)*C;#charging time constant#\n",
+    "T2= .693*Rb*C;#discharging time constant#\n",
+    "T=T1+T2;#total time#\n",
+    "f=1/T#frequency#\n",
+    "print 'frequency=%.3f KH'%(f*10**-3)\n",
+    "D=T2/T;#duty cycle#\n",
+    "D=D*100\n",
+    "print 'duty cycle=%.2f percent'%D"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
diff --git a/testing_by_test/screenshots/screenshot6.png b/testing_by_test/screenshots/screenshot6.png
new file mode 100644
index 00000000..ae7ed518
--- /dev/null
+++ b/testing_by_test/screenshots/screenshot6.png
diff --git a/testing_by_test/screenshots/screenshot6_1.png b/testing_by_test/screenshots/screenshot6_1.png
new file mode 100644
index 00000000..ae7ed518
--- /dev/null
+++ b/testing_by_test/screenshots/screenshot6_1.png
diff --git a/testing_by_test/screenshots/screenshot6_2.png b/testing_by_test/screenshots/screenshot6_2.png
new file mode 100644
index 00000000..ae7ed518
--- /dev/null
+++ b/testing_by_test/screenshots/screenshot6_2.png