Year: 2015

FinancialFormula Forecasting in MSChart C#

MSChart control is very powerful tool for data display and analyzing. One very powerful feature is FinancialFormula Forecasting in MSChart C#. We can, for example,  model data with Linear Regression by using FinancialFormula Forecasting. Here is an example: chart1.Series.Clear(); chart1.Series.Add(“Over

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Convert Arraylist Into Array in C#

Why and when we need to convert arraylist into array in C#? If we have some data in RAM memory (arraylists) and want to sort the data in one arraylist by another arraylist (they have to be the same size),

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Using mschart C#

There are variety of possibilities to display data graphically if we know how to use ms chart control in C#. So using mschart in C# will be explained with mschart example in C#. We need to include namespace for using

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Convert Datetime to int c#

We need to convert datetime to int in c# for example when we want to add new series of the data in chart control to previously added series of data where x axis was given in datetime format. If in

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Add a Second Activity using Intent in Android Studio

When you want to add a second activity in Android Studio, perhaps best way is to do it by using Intent class. Once when you made your first android app as single activity apk, next natural thing is that you

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Keyword out and code examples in C#

Both keyword ref and keyword out in C# change the behavior of called method parameters. The difference is that the parameter passed as ref must be initialized before passing to the method. Parameter passed with keyword out in C# needs

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Ohms law calculator

To use Ohms law calculator, enter two magnitudes of three (voltage, resistance or current) and click calculate button to calculate remaining magnitude VCC: V R: Ω I: A Calculate Read about Ohm’s law

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Ohm’s law formula

Go to Ohm’s law calculator. Ohm’s law define current magnitude of the current that flows through out resistor like one given in figure bellow (Ohm’s law circuit). So current through resistor R, according to Ohm’s law formula is This form

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Open Macro in Excel 2013

This is just an brief instruction how to open macro in excel 2013. First go to File→Options Then click on Customize Ribbon and enable Developer option. Now developer option will appear in the excel 2013 toolbar. Then we can reduce

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Current Divider Calculator

To use current divider calculator, enter input current, R1 and R2 and calculate currents through R1 and R2 IIN: A R1: Ω R2: Ω I1: A I2: A Calculate Read about current divider

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Current Divider Formula

Go to current divider calculator. Current divider is actually two resistors connected in parallel. Now, if we know input current and R1 and R2 resistor value, we can calculate how input current will split up, i.e. how much are I1

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Add Picture to Android App

When you want to add picture to android app, you need to insert ImageView widget first. Now, prepare your picture in PNG format (recommended size should be inside dimension of 80X80 pixels). Then paste it into app→src→main→res→drawable. Note: your PNG

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Voltage Divider Calculator

To use voltage divider calculator, enter input voltage, R1 and R2 and calculate output voltage. VCC: V R1: Ω R2: Ω VOUT: V Calculate Read about voltage divider Check your calculation on the other site.

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Voltage Divider Formula

Go to voltage divider online calculator. Voltage divider is actually two resistors connected in series. Now, if we know VCC and R1 and R2 resistor value, there is a question, how much is VOUT? By intuition, if R1=R2 then VOUT

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Publish Android App on Google Play

Your Android app is functional and ready. What to do next? You need to publish android app on Google play. So, click on your android building variants button. Then go to build variants and switch from debug to release. At

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Add Link into Android App

Once when you made your initial application with AdMob in it you need to put some functionality to it. If we make application for calculation of greatest common divisor, we can put in app→res→layout→activity_main.xml (design view) some large text widgets,

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Your First Android App with AdMob

If you start to develop your first android application in Android Studio or in any other programming tool, you would like to have some benefit from it. The best way to achieve this is to add Google AdMob into your

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Initial Steps in Android Programming

Initial Steps in Android Programming are following: We need to install Java JDK first. Next step is to do android studio installation. But even on this early step, problems might appear, see the figure bellow. So we need to set

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Keyword ref and code examples in C#

Keyword ref in C# forces an argument to be passed to the method to be passed by reference. It means that argument must be initialized before it is passed to the method. It also means that any change in the

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Least common multiple calculator

Enter integer numbers and calculate least common multiple. N:   M:  LCM:  Calculate Read how least common multiple can be calculated in C#

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Least common multiple in C#

Calculate least common multiple Least common multiple is the smallest positive integer that is divisible by both a and b. Now, if we know greatest common divisor of two positive, greater then zero integers a and b, we can calculate

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Greatest common divisor calculator

Enter integer numbers and calculate greatest common divisor. N:   M:  GCD:  Calculate Read how greatest common divisor can be calculated in C#

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Greatest common divisor code in C#

Greatest common divisor of two positive integer numbers N and M, both larger then zero is the largest integer R that divide both N and M. If for given N and M, greatest common divisor is 1, we say that

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Serial R-C circuit impedance

Go to Serial R-C circuit impedance calculator Serial R-C circuit is given in figure bellow In the stationary regime, we can use complex impedance for capacitor and R for resistor. So final expression for serial R-C circuit impedance It is

Posted in electric

Parallel R-C circuit impedance

Go to Parallel R-C circuit impedance calculator Parallel R-C circuit is given in figure bellow In the stationary regime, we can use complex impedance for capacitor and R for resistor. Parallel R-C impedance is So final expression for parallel R-C

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168-dc-dc-converters-online-simulator

In this page, DC DC Converters online simulator is given for following DC DC converters: Boost or Step Up Converter Buck or Step Down Converter Buck-Boost Converter Flyback DC-DC Converter Forward DC-DC Converter

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189-binary-search-tree-height-in-c

First functionality of methods in binary search tree class is to count nodes of binary search tree recursively and to measure binary search tree height. Taking the data from previous example, and starting with following array { 53, 72, 14,

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188-binary-search-tree-implementation-in-c

Major property of the binary search tree is self-similarity (every leaf can be root for another smaller binary search tree). For that reason, in BST we can use recursive functions to find or count the data. Searching through BST is

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182-time-complexity-and-big-o-notation

Time complexity is the important term in sense of how many steps has to be taken in order to complete given algorithm. In order to describe complexity, big O notation is used. For example, linear complexity is expressed in big

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180-linq-orderby-operator-and-lambda-expression-in-c

LINQ OrderBy operator we use to sort data in LINQ query. With using lambda expression (=>) example is follows: int[] nums = new int[] { 0, 4, 2, 6, 3, 8, 3, 1 }; var result1 = nums.Where(n => n

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179-linq-restriction-operator-where-clause-indexed-in-c

LINQ restriction operator where is very useful when we want to filter or restrict some data. For example, if we want to filter all numbers higher or equal 3 by using LINQ restriction operator where here is an example: int[]

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178-linq-let-clause-let-keyword-using-c

LINQ Let clause i.e. LINQ Let Keyword is a part of a query expression. Let clause allows LINQ query expression to be more readable and code to be shorter and easier to understand. Let also introduces variable that can be

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177-linq-join-operator-in-c

In this article, we have LINQ example of usage of join operator in C#. Perhaps, the easiest way to explain usage of join operator in C# is by example. In first example we have two arrays of double type. Now,

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176-linq-set-operators-union-intersection-except-in-c

If we want to use LINQ Set Operators in C#, then set operations such as union, intersection and except are really one line of code. Take a look at following examples. Intersection: int[] set1 = { 1, 2, 3, 5

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175-linq-example-mapping-one-array-to-another-in-c

If we have an array of strings, with people names for example and would like to display them in some arbitrary order given in another array of integers, we can manipulate two arrays with LINQ in C#. Here is LINQ

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173-making-stack-data-structure-with-list-in-c

Stack data structure is a LIFO collection and is a generic type. It exist in C#, and it is defined in namespace: using System.Collections.Generic; It can be declared as follows: Stack<int> stack = new Stack<int>(); and as any stack it

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171-count-distinct-elements-in-array-in-c

If we use LINQ query, we can count distinct elements in array in C# by following command: int[] a = { 0,0,1,7,17,1,2,2,3 }; int count = a.Distinct().Count(); The other way to count distinct elements in array in C# if array

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161-order-by-in-linq-query-and-linq-query-on-xml-document-c

LINQ in C# stands for Language Integrated Query. It is brilliant programming concept implemented in C# programming language to virtualizes underlying data source. This means, that for example we can apply linq query on XML document in C# as easy

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160-send-json-text-over-http-in-c

Sending data over http in C# is easy if we use HttpWebRequest and WebResponse classes. Once when we have our data in json format ready for sending, we can send json text over http in C#. We need to make

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159-read-xml-file-and-write-xml-file-in-c

To read XML file in C# or to write XML file in C# it is best to use System.Xml namespace. Namespace System.Xml.Linq; is also useful for this purpose. Now, to write XML file, we need one object of XmlWriterSettings class.

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158-convert-json-to-xml-and-convert-xml-document-to-text-in-c

In previous article we discussed how to convert XML data to json format. Converting in opposite direction is as just as simple. So to convert json to XML in C# let’s assume that we have data in json format are

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156-open-excel-doc-in-c

To get data from Excel in C# or to insert data into Excel in C#, we need to open Excel doc in C# first. There are two ways to access Excel data in C#, either To use Microsoft.Office.Interop.Excel.dll namespace or

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Creating ms access database from excel worksheet

In this tutorial it is explained how to create MS Access database from excel worksheet. First, we need to create new MS Access database. We need to give full path and type name of new database. And then, click “Create”.

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154-convert-xml-to-json-in-c

If XML data are small in structure, there is a way to convert XML to json in C# by knowing how to serialize dictionary to json in C#. We need to use using System.Web.Script.Serialization; namespace. It has to be added

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153-htmlagilitypack-selectsinglenode-vs-descendantnodes-in-c

Scraping data in C# is easy using HtmlAgilityPack. In this short tutorial we will focus on how to select Nodes and Subnodes with HtmlAgilityPack. In this project, we need to download htmlagilitypack.dll. Next step is to add reference, like for

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151-open-word-doc-in-c

To handle MS Office documents from C# it is essential to add assembly to your C# project. Reference for handling MS Office documents is in microsoft.office.interop.word.dll. So you need to download this dll file first. Next step is to add

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147-c-sharp-how-to-make-a-dll-file

In order to make a dll file from C#, first step is to start creating class library .dll project (see figure bellow). Rest of the job is similar to writing down any other C# class, but we need to take

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146-c-sharp-program-for-permutation.html

Making all permutation of the given set of characters is most time effective if it is done with Heap’s algorithm. C# program for permutation with recursive function call in according to Heap’s algorithm is presented. First thing that we need

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145-c-sharp-parallel-threading-example

To use paralleling of the treads in C#, we need to use System.Threading.Tasks; namespace. There are several ways to parallelize threads, including usage of PLINQ. In here, for educational purpose most simple c# parallel threading example as console application is

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144-c-sharp-md5-hash-code-example

C# md5 hash code can be easily obtained by using following namespaces: System.Security.Cryptography; System.Globalization; System.IO; If we want to calculate md5 hash that is 32 characters long string of any input for simple string, we can do it with just

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142-c-sharp-basic-string-methods-and-parse-numberstyles

Knowing C# basic string methods can be very useful and time saving. In this article, we will use some of C# basic string methods in order to appropriately parse large string for crc bytes calculus. For that purpose, it is

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141-c-sharp-crc-computation

Read also C# crc checksum class C# crc checksum code for binary files C# crc checksum code for MODBUS RTU CRC computation is the method for error detection in sending/receiving binary data. It is different from error auto correction, but

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140-c-sharp-event-handler-for-serial-communication-with-delegate-method

C# event handler for serial communication is equivalent to interrupt concept. When data arrives from outside world into serial port buffer, interrupt signal is generated. To make application that uses serial communication with event handler in c#, it is practical

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139-c-sharp-crc-code-for-modbus-rtu

Modbus is serial communication protocol. It is widely spread in industry and mainly is used to connect master communication device (usually PC) to remote terminal unit (RTU). Information package from master to slave device in MODBUS protocol has following format

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138-c-sharp-crc-checksum-code-for-binary-files

A cyclic redundancy check (CRC) is an error-detecting code. In this article, C# crc checksum code for binary files is given. For 16 bit CRC calculus for binary files, first step is to have all of the data (all of

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137-c-sharp-odbc-connection

When there is a need to program databases in C# we can access given database either by Using SqlConnection and SqlCommand class or by using ODBC connection. ODBC – Open Database Connectivity is Microsoft interface for accessing database management systems

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136-c-sharp-binary-read-and-binary-write

In order to access binary file from C# it is comfortable to use OpenFileDialog class. To handle binary, either to read binary file or to write to binary file in C#, we need to use System.IO namespace. Inside System.IO namespace

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134-c-sharp-timer-and-serial-communication-example

C sharp application uses timer whenever is necessary for application to regularly control something in equal time intervals, from reading the system clock to communicate with firmware via serial communication. Timer tick function must do the regular task every time

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133-c-sharp-mdi-application

Making Multiple-Document Interface (MDI) in C# is your next big step towards professional programming. Any good windows forms application has to have multi functionality, i.e. many child forms that should be accessible from parent form by using menu. Actually, every

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124-c-sharp-sql-like-command-for-search

Easier way to connect to database is C# odbc conncetion to database In this tutorial c sharp SQL like command for search is explained, i.e. how to search similar data with SQL query command like from C#. We continue from

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123-c-sharp-sql-delete-command

Easier way to connect to database is C# odbc conncetion to database In this tutorial c sharp SQL delete command is explained, i.e. how to delete data with SQL query from C#. We continue from initial database tutorial. C sharp

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122-c-sharp-sql-update-command

Easier way to connect to database is C# odbc conncetion to database In this tutorial c sharp SQL retrieve data is explained, i.e. to retrieve data with SQL query from C#. We continue from initial database tutorial. private void clear_all_fields()

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121-c-sharp-sql-retrieve-data

Easier way to connect to database is C# odbc conncetion to database In this tutorial c sharp SQL retrieve data is explained, i.e. to retrieve data with SQL query from C#. We continue from initial database tutorial. private void clear_all_fields()

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120-c-sharp-sql-insert-command

Easier way to connect to database is C# odbc conncetion to database In this tutorial C Sharp SQL Insert command is explained, i.e. how SQL Insert Command is implemented in C#. We continue from previous example. string str_sql_insert = ”

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119-c-sharp-sqlconnection-and-sqlcommand-class

Easier way to access database from C# is to Connect to database via odbc connection If we connect to databases in C# directly, two additional namespaces are necessary: using System.Data.SqlClient; using System.Collections; In our C# program, we need to use

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118-c-sharp-sql-database-connection

This example is for Microsoft SQL Server 2008 database connection. First step is to make right click in Solution Explorer and Add->New Item… Then, choose Service-based Database. Choose a Database Model. Choose your Database Object. Once when Data Connection is

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117-c-sharp-tab-control

C sharp tab control is control from TabControl Class. C sharp tab control is the part of C# Containers Toolbox. Once when it is added to Windows form, additional tabs can be added as collection. We can add two more

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116–c-sharp-menustrip-and-openfiledialog-example

C sharp menuStrip and c sharp OpenFileDialog are visual controls in C# for adding application menu items and opening files, respectively. C sharp menuStrip is the part of C# Menus & Toolbars Toolbox. C sharp OpenFileDialog is the part of

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115-c-sharp-listbox-and-combobox-example

C sharp listbox and c sharp combobox are among most popular visual controls in C# windows forms applications. They are similar and they have similar proporties and methods. In this example, we will prepare one form with one listbox, one

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114-c-sharp-file-handling

C sharp file I/O methods are in namespace called System.IO. C sharp file handling implies files listing, files and folders creation, writing down and reading from file. Here is the code for listing folder: using System.IO; static void Main(string[] args)

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113-c-sharp-hashtable-example

C sharp hashtable is very useful data structure in C#. Actually, it is kind of arraylist with two-dimensional Items. With this two-dimensional feature it can be very easy to define look-up table for different type of data such as string

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112-c-sharp-arraylist-example

C sharp arraylist are particularly useful in: Collecting ID from the database C sharp arraylist is different from list as data structure in good old fashion C. List is a data structure where nodes can’t be accessed by index, but

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111-c-sharp-class-for-crc-checksum-calculator

About CRC checksum calculus, you can also read: C# crc checksum code for CRC-16-ANSI, CRC-CCITT, CRC-XMODEM C# crc checksum code for binary files C# crc checksum code for MODBUS RTU A cyclic redundancy check (CRC) is an error-detecting code. It

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110-c-sharp-array-and-multidimensional-array-example

C sharp array is different in defining from array in C programming language. Array in C program would go like this: int a[10]; C sharp array example in here would be used together with for loop to write “Hello World!”

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109-c-sharp-class-example-constructor

C Sharp is object oriented programming language. It means that programmers should be object oriented in thinking while writing down code in C#. For simplicity, and completeness of this tutorial, our first c sharp class example will be given as

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jQuery – JavaScript split string to array of float

If we want to use JavaScript to split string to array of float, then we can simply use “split” method. For example if we have string in text box named textfield1 in our document form, we can simply convert data

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How to Enlarge Image in Jquery Cursor Pointer

Advanced way to emphasize image in your html page by using jquery is to resize it on event .mouseover(function(){}); It is more effective then usage of .show(), .hide(), .fadeIn() and .fadeOut() functions described in previous article. So let’s start with

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First Steps in Jquery Get Started with Jquery

If you want to get started with jquery you need to consider your first steps in jquery first. After you have included your jquery reference in your script, perhaps easiest way to start with jquery is to hide an element,

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How to Start with jQuery

How to start with jquery? First step is to download jquery. Choose your version (1 or 2), and preferably compact version (.min) that three time less in size then non compact. If you use downloaded reference, you must have apache

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Starting with Xamarin

Once when you have installed Xamarin on your PC, you can get starting with Xamarin. You need to: Update Android SDK Tools Install USB device driver on you mobile Put USB option on your mobile on USB Debugging option. Check

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Start new Xamarin project

This is an example how to start new Xamarin project cross platform solution. First thing to do is to start in Xamarin studio with File→New→Solution. Then we choose other blank solution: Other→Blank Solution Now, we need to add new project

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Electronic and Electric Circuit Simulation

Automatic Fuzzy Logic Calculator Bipolar transistor simulation schemes Darlington pair Differential Amplifier Simulation NPN-BJT Common Emitter Amplifier NPN-BJT Common Emitter Amplifier with Negative Feedback NPN-BJT Common Collector Amplifier NPN-BJT Common Base Amplifier Push-Pull Output Relaxation Oscillator Diode simulation schemes Diode

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PFC Power Factor Corrector Circuit

Power factor in power network is defined as the ratio of real power delivered to the load to apparent power. Strict mathematical definition of power factor (cos(φ)) is In here, P is active power, S is apparent power and φ

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Voltage Mode Control and One Cycle Control

Voltage mode control is regulating scheme for controlling switching mode power supply. This controlling method has only one feedback loop over output voltage. Control is achieved by pulse width modulation (PWM), where constant amplitude voltage sawtooth signal is compared with

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Current Mode Control

Current mode control also known as current programming regulating scheme is controlling method for switching mode power supply regulation. Specific of current mode control (CMC) is that this is a controlling method with two loops: Outer voltage loop Inner current

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Forward DC DC Converter Basics

Go to forward dc-dc converter online. Forward dc-dc converter is actually transformer isolated buck dc-dc converter topology. To see this, we need to start form buck converter scheme. If we want to do galvanic isolation of the load, we can

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Flyback DC DC Converter Basics

Go to flyback dc-dc converter. Even though some authors presents flyback converter as transformer isolated boost converter, it is more closer to reality that flyback dc-dc converter can be explained as transformer isolated buck-boost converter. In order to prove this,

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Boost or Step Up Converter Basics

Boost DC-DC converter online simulation Boost converter is third switching mode power supply topology without transformer, with one inductor and one capacitor (apart from buck and buck-boost converter). Boost or step-up converter topology is given in figure bellow. In boost

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Buck-Boost Converter Basics

Go to buck-boost converter simulation. Buck converter is actually first switching mode power supply topology (first DC-DC converter) ever made. Being generally very efficient and consisting of only two passive elements that can store energy (capacitor and inductor), and only

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Buck or Step Down Converter Basics

Buck or step down converter is switching mode power supply (SMPS) DC-DC converter. Go to buck (step down) DC-DC converter simulation. There is widespread request for power supply voltage adjustment for particular needs. For example, if there is micro processor

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97-ne555-monostable-multivibrator

Monostable multivibrator realized with ne555 timer circuit is given in figure bellow. Simulate ne555 monostable multivibrator online. NE555 is very handy for monostable operation too. Generally, monostable multivibrator must be triggered in order to operate. Once when it is triggered,

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95-ne555-digital-oscillator

Simulate ne555 oscillator online. Digital oscillator realized with ne555 timer circuit is given in figure bellow. This kind of digital oscillator is just modification of ne555 astabile multivibrator. The advantage of this modification is that diode provides different charging and

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94-ne555-astable-multivibrator

Astable multivibrator (oscillator) realized with ne555 timer circuit is given in figure bellow. Simulate ne555 astable multivibrator online. NE555 is perhaps most widely spread integrated circuit in the world. Reason for widespread is need to easily obtain timer circuit as

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Op-amp Summing Amplifier

Op-amp summing amplifier and op-amp non inverting summing amplifier are analog circuits for analog summing of the input signals. Simulate op-amp summing amplifier. Simulate op-amp non inverting summing amplifier. Op-amp summing amplifier is given in figure bellow. By using superposition

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170-op-amp-differential-amplifier-simulation

Op-amp differential amplifier is given in figure bellow. Simulate op-amp differential amplifier. Input in op-amp is already realized as differential amplifier with discrete components. Voltage gain from inverting input to the output is the same as voltage gain from non-inverting

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162-op-amp-instrumentation-amplifier

Op-amp instrumentation amplifier is given in figure bellow. Simulate op-amp instrumentation amplifier. Op-amp instrumentation amplifier is a circuit that combine op-amp differential amplifier with two input buffer amplifiers. This is very successful combination, since op-amp instrumentation amplifier has very high

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82-op-amp-integrator-simulation

Inverting integrator amplifier realized with op-amp is given in figure bellow. Simulate op-amp inverting integrator amplifier. Op-amp voltage integrator is the circuit that integrates input voltage over time. Input impedance is equal to R1, and feedback is capacitive (capacitor C).

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83-op-amp-differentiator-simulation

Inverting differentiator amplifier realized with op-amp is given in figure bellow. Simulate op-amp inverting differentiator amplifier. Op-amp voltage differentiator is the circuit that differentiates input voltage over time. Input impedance is equal to and feedback is resistive (resistor R1). Output

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85-op-amp-schmitt-trigger-simulation

Non-inverting Schmitt trigger realized with op-amp is given in figure bellow. Simulate op-amp non-inverting Schmitt trigger. Positive feedback is used with non-inverting Schmitt trigger realized with op-amp. The feedback is applied from the output to the non-inverting input of the

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84-op-amp-inverting-schmitt-trigger-simulation

Inverting Schmitt trigger realized with op-amp is given in figure bellow. Simulate op-amp inverting Schmitt trigger. Positive feedback is used with inverting Schmitt trigger realized with op-amp. The feedback is applied from the output to the non-inverting input of the

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