Viki Lab

This video shows how to identify the pins 2n3055 transistor by two ways: 1.By using the datasheet of the transistor. 2.By using the multimeter & the datasheet. Although the datasheet provides the correct information to identify the pins of this transistor majority of the people find it very difficult to extract this information directly from the data sheet as identifying the pins from the transistor depends upon the physical dimensions of the transistor. Although the transistor layout looks symmetrical it is not ,so measuring or judging by the eye is difficult as the difference is only a few millimeters. In this video with the aid of a multimeter we determine the pins of this transistor very precisely. The datasheet clearly states  that the metal casing  of the transistor is the collector so the problem is actually determining the base and the emitter of the transistor. For the process we start by putting the multimeter to the diode mode and then connecting the ...

Comments in C++ Programming Comments are used mainly to describe the code. Comments are ignored by the compiler. There are two types of comments: Single line comments. Multi-line comments. Single line comments start with two forward slashes // Comments are just to describe the code,they are never executed. Multi-line comments: This type of comments are used to comment out multiple lines. This type is better for giving a detail description of how the code functions. Multi line comments start with /* and end with */ In between the content is added. Multi line comments span multiple lines. You can even nest comments one type of comment inside another . Adding comments in the code makes no difference to The results of the code is as the comments have no influence on the code. Adding comments is a good practice as it facilitates a clear understanding of the code for you and others as well. Example: /* Hello user this Is an example of multi line commenting*/ ...

How To Make a 0-12V Variable Power Supply In Sinhala | Part 02 Expanding the setup to a 0-12V variable power supply. We have already completed the 12V fixed powersupply tutorial vide so if you havent watched it first watch it and continue. By now we have completed the project upto a 12V fixed power supply as our next step we are to make the power supply variable. Additional Components Required: D400 x1 2N3055 x1 100kO variable resistor 1kO  Determining the pins of the d400 transistor is very straight forward but it can be tricky in the case of 2n3055. Refer the pdf for the pin configuration of the D400 transistor: 2N3055 : According to the data sheet the metal casing is the collector of the transistor. The problem is identifying the base and the emitter of the transistor. Steps: Put the multimeter to the diode mode. Connect the probes of the multimeter to the two leads of the transistor. If there is a reading on the multimeter then the positive probe is th...

In this tutorial you will learn everything about using and printing on new lines. There are many methods to use new lines, the most fundermental method is to use  the endl operator at the end of the cout statement. The endl operator make sure that the next cout statement will be printedc on a new line. The endl can be replaced by the use of the new line character \n. the \ is an escape character.Sometimes is essential that we need to escape many lines before the next text is printed on to the screeen  for this in C++ the new line character can be used as required.  \n\n will escape two lines before the next text get printed on the screen. where the use of \n\n\n\n\n would print 5 blank lines before the next text is printed. C++ provides us futher options to simplify the code for printing text on to the screen. In C++ it is possible to print new lines as required inside a single cout ,  this is done by inserting the newline escape character where requ...

Variable Resistor එකක අගය සරලව ගණනය කර ගන්නා ආකාරය සිංහල බසින්!   These are a special type of resistors that provide us the ability to change their resistance as required by the user. Basically there are two versions available at traditional electronic shops as; -Volume control (Big Size) -Preset (Small Size) Volume control type can be very easy to manipulate due to the large size. These resistors cannot handle much power (~0.25W). These devices usually comes with three terminals and could be used in two major ways: 1. As a variable resistor. 2. As a potential divider. The smaller version (preset) are to be tuned to the required resistance with the help of a screw driver but the volume control type can be easily tuned as required with the help of our hand. Variable resistors have a variety of applications such as controlling your radio's volume, changing the speed of your fan... To use the device as a variable resistor we only use two pins out the three simple ...

අදුරට සංවේදී පරිපටයක් සකස් කර ගන්නා ආකාරය සරල සිංහලෙන්. Dark sensitive circuits have a range of applications such as turning on lights when the light level falls below a certain threshold.In our circuit this threshold is changed by using a variable resistor which can be turned to fine tune the circuit. The circuit consists of the following components: C828 transistor x1 7805 voltage regulator x1 1 kilo ohms resistor x1 LDR x1 LED x1 100 kilo ohms variable resistor.  The base current of the transistor is controlled by the potentiometer.In very low light conditions the ldr will have a very high resistance and in high light conditions the ldr will have a low resistance.In the dark condition less current will flow through the ldr so more current passes through the base of the transistor causing a high current flow through the led via the collector pin of the transistor causing the led to light up but in high light condtions the ldr will have a low resistance there for most...

සරල Water Level Sensor එකක් D400 transistor එකක් භාවිතා කර සාදා ගැනීම!  Water level sensors can be used for many interesting projects. Examples : -To switch a water pump on and off to fill the water tank automatically. -To gather rainfall data. Part List: D400 transistor x 1 1 kO resistor x 1 150-330O resistor x 1 LED x 1 Ic 7805 Voltage regulator  Transistors consists of three pins as : *Emitter *Collector *Base 7805 regulation is used to add an extra layer of protection for the circuit. The user can directly omit the 7805 regulation part if the user can apply suitable voltage. The first circuit is a case where the presence of water will cause the led to light up  1 kilo ohms resistor is placed in series with the base pin to prevent too large base current. The 330 ohms resistor places in series with the led is to prevent too large current from flowing through the  led, the probes must be selected according to the application sometimes you may need corrosion resistan...