electrical theory and electrical fundementals for all electrical related people . students , engineers, electrician #electricaltheorems,electrical,

Thursday, 8 February 2018

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How to Lock Folder in Windows without Any Software

electrical theory and electrical fundementals for all electrical related people . students , engineers, electrician #electricaltheorems,electrical,

HOW TO LOCK FOLDER IN WINDOWS


                            How to lock folder in windows without any help of Third party software. Just using command prompt code


Step 1:


     Create a new text document 
      Right Click --New ----Text Document


Step 2:

 Open Text file and Copy this below code and paste and change das to your password

cls
 @ECHO OFF
 title My Folder
 if EXIST "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" goto UNLOCK
 if NOT EXIST Secure goto MDLOCKER
 :CONFIRM
 echo Are you sure you want to lock the folder(Y/N)
 set/p "cho=>"
 if %cho%==Y goto LOCK
 if %cho%==y goto LOCK
 if %cho%==n goto END
 if %cho%==N goto END
 echo Invalid choice.
 goto CONFIRM
 :LOCK
 ren Secure "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
 attrib +h +s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
 echo Folder locked
 goto End
 :UNLOCK
 echo Enter the Password to unlock folder
 set/p "pass=>"
 if NOT %pass%== das goto FAIL
 attrib -h -s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
 ren "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" Secure
 echo Folder Unlocked successfully
 goto End
 :FAIL
 echo Invalid password
 goto end
 :MDLOCKER
 md Secure
 echo Secure created successfully
 goto End
 :End


Step 3:


Save as this file with .bat extension

Step 4:


Double click the .bat file


Step 5: 

           Save your secret files in new created folder Secure

Step 6: 

   
       Double click the bat file and enter Y in command Window. That time your secure folder hide in system


Step 7: 

      Double click the bat file and enter your password  and open your folder



Sunday, 21 January 2018

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How to Test Antivirus to Your Computer

electrical theory and electrical fundementals for all electrical related people . students , engineers, electrician #electricaltheorems,electrical,

How to Test Antivirus 




If you are active in the anti-virus research field, then you will regularly receive requests for virus samples. Some requests are easy to deal with: they come from fellow-researchers whom you know well, and whom you trust. Using strong encryption, you can send them what they have asked for by almost any medium (including across the Internet) without any real risk.

Other requests come from people you have never heard from before. There are relatively few laws (though some countries do have them) preventing the secure exchange of viruses between consenting individuals, though it is clearly irresponsible for you simply to make viruses available to anyone who asks. Your best response to a request from an unknown person is simply to decline politely.

A third set of requests come from exactly the people you might think would be least likely to want viruses "users of anti-virus software". They want some way of checking that they have deployed their software correctly, or of deliberately generating a "virus incident in order to test their corporate procedures, or of showing others in the organisation what they would see if they were hit by a virus".

Reason For Testing Antivirus


Obviously, there is considerable intellectual justification for testing anti-virus software against real viruses. If you are an anti-virus vendor, then you do this (or should do it!) before every release of your product, in order to ensure that it really works. However, you do not (or should not!) perform your tests in a "real" environment. You use (or should use!) a secure, controlled and independent laboratory environment within which your virus collection is maintained.

Using real viruses for testing in the real world is rather like setting fire to the dustbin in your office to see whether the smoke detector is working. Such a test will give meaningful results, but with unappealing, unacceptable risks.

Since it is unacceptable for you to send out real viruses for test or demonstration purposes, you need a file that can safely be passed around and which is obviously non-viral, but which your anti-virus software will react to as if it were a virus.
If your test file is a program, then it should also produce sensible results if it is executed. Also, because you probably want to avoid shipping a pseudo-viral file along with your anti-virus product, your test file should be short and simple, so that your customers can easily create copies of it for themselves.

The good news is that such a test file already exists. A number of anti-virus researchers have already worked together to produce a file that their (and many other) products "detect" as if it were a virus.

Agreeing on one file for such purposes simplifies matters for users: in the past, most vendors had their own pseudo-viral test files which their product would react to, but which other products would ignore.

Antivirus Test File 

This test file has been provided to EICAR for distribution as the "EICAR Standard Anti-Virus Test File", and it satisfies all the criteria listed above. It is safe to pass around, because it is not a virus, and does not include any fragments of viral code. Most products react to it as if it were a virus (though they typically report it with an obvious name, such as "EICAR-AV-Test").

The file is a legitimate DOS program, and produces sensible results when run (it prints the message "EICAR-STANDARD-ANTIVIRUS-TEST-FILE!").

It is also short and simple - in fact, it consists entirely of printable ASCII characters, so that it can easily be created with a regular text editor. Any anti-virus product that supports the EICAR test file should detect it in any file providing that the file starts with the following 68 characters, and is exactly 68 bytes long:

Copy This Code

X5O!P%@AP[4\PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*


Download Test File 




Thursday, 21 December 2017

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Play Music Using Light | LiFi system

electrical theory and electrical fundementals for all electrical related people . students , engineers, electrician #electricaltheorems,electrical,



LiFi System


Light Fidelity (Li-Fi) is a new paradigm in wireless communication. In this article, we describe the design of a Li-Fi dongle (transmitter) and speaker (receiver) for audio and music applications. The proposed system is a replacement for wired speakers that plays audio signals received through light.

1. The LED light in a room is used not just to light up the room but also to play music, thus giving benefits of both the worlds. Also, LED bulbs use 85 per cent less energy than incandescent bulbs and last up to 20 times longer, whereas majority of Bluetooth modules are battery powered and generally last a year or two only before they need replacement. Hence the proposed system is energy-efficient over Bluetooth version.

2. You can receive Li-Fi data as long as you are in the range of the light being emitted by the LED light source. Hence, the range depends on the strength of the light being emitted.
3. Connectivity needs to be established between the Bluetooth transmitter and the receiver, whereas with Li-Fi any user can receive data and play music on his speaker by simply keeping the receiver in the range of LED light source.
4. The proposed system can be used with any audio system by just connecting the Li-Fi dongle to its audio output jack, with no pairing and connectivity requests. This overcomes the problem of connecting a Bluetooth speaker to audio systems that do not have USB port and Bluetooth support, which is otherwise a tougher task.
5. The proposed Li-Fi dongle and speaker costs lower than a Bluetooth dongle and speaker.
The proposed concept is illustrated in Fig. 1. It uses a Li-Fi dongle to transmit audio signals from a source such as mobile phone, and a Li-Fi speaker with solar cells at the receiver end to receive audio signals without wires.
The proposed Li-Fi dongle is connected to the audio jack output available on mobile phones. It has an LED through which audio/music signals are transmitted as light signals. These light signals are captured by the Li-Fi speaker through the solar cell array.

Circuit and Working Details


shows the circuit of the Li-Fi dongle. It uses three common-emitter (CE) amplifiers connected in parallel to amplify the input audio signal. The Li-Fi speaker is designed by connecting the output of a 3V, 200mA solar cell array to a speaker’s audio input. For this, connect the terminals of the solar panel to a 3.5mm female audio socket. Then, connect the 3.5mm audio jack from the speaker to the female socket.
However, you need not buy the exact speaker or Li-Fi speaker. Any speaker with inbuilt amplifier will do the job. You can modify the same to work as a Li-Fi speaker by interfacing a solar panel to it. After adjusting the band equaliser in the audio source and the distance between the solar panel and the light source, you can get almost noise-free sound from the speaker.
The maximum distance/range between the transmitter and receiver depends on the number of amplifier stages. For a three-stage CE amplifier, the maximum distance is about two metres with LED illuminance of 13,842.00 lux at the receiver side. For a five-stage CE amplifier, the distance can be up to 2.6 metres with LED illuminance of 17,382.00 lux. It was observed that as you increase the number of CE amplifier stages connected in parallel in the transmitter circuit, the intensity of LED light also increases, which, in turn, increases the maximum distance up to which the sound is audible from the Li-Fi speaker.

Sunday, 8 October 2017

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HOUSEPARTY- Group Video Chat Application

electrical theory and electrical fundementals for all electrical related people . students , engineers, electrician #electricaltheorems,electrical,

HOUSEPARTY APPLICATION 




Houseparty is the group video chat app that you’ve been missing in your life. It’s simple, synchronous and social. We empower people to have more frequent conversations with the people they care about most, meet new friends, and have fun together - wherever they are.