How Does LED Emits Various Color ??

LED (Light Emitting Diode)

We have learned about LED's construction, circuit pinout in our post on LED's (click here).

In this post we are going to discuss about the color of the LED, many few of us know "How LED emits color light".

• The color of the emitted light is decided by its wavelength.
• As we know LED's are made up of semiconductor material, hence the "color of the LED depends upon the the material used to made LED."
•  Silicon and Germanium are not used because the do not emit light in the visible spectrum.

• Colors associated with the different materials are as follows

• RED OR YELLOW            --- Gallium Arsenide Phosphide (Ga As P) is used.
• RED OR GREEN               --- Gallium Phospide (Ga P) is used.
• Infrared                                --- Gallium Arsenide (Ga As) is used.
• Blue                                       --- Galium Nitride (Ga N) is used.

• Some LED's are capable of emitting infrared light which is not visible to our eyes.

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Introduction to Diode

Diode is a two terminal electrical component i.e. anode and cathode. Diode is the first semiconductor electronic component, it is an very important component in electronics, we can say that  " Diode is the Heart of Electronics".
Types of Diode include Rectifier diode(normal diode), Zener diode, Signal diode, Light emitting Diode etc.

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How To Make PCB at Home

"How to make PCB at home ?" is always an question in front of all electronics hobbyist. Here i will teach you most common method used at home for making PCB, known as "Toner Transfer Method". It is a very easy and cheap process of making a PCB at home.

Here is the list of all the things you will be going to need to make an PCB
 1. Copper PCB board.
2. A photo paper (also known as glossy paper).
3. Ferric Chloride FeCl2 solution. (Substitute for ferric cholride : The mixture of HCl acid and Hydrogen  Peroxide, in the proportion 1:2 i.e one parts of HCl and two part of hydrogen Peroxide)
4. Plastic container.
5. Electrical or Masking tape.
6. Electric Iron.
7. Acetone.
8. Drill

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5 Awesome Notepad Tricks

1. Cycle a message in your friend's computer:
Type :

@ECHO off
:Begin
msg * Hi
msg * Are you having fun?
msg * I am!
msg * Lets have fun together!
msg * Because you have been o-w-n-e-d
GOTO BEGIN

Save it as Anything.BAT and give it to your friend. You can change the message and type your own message there.
 

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How To Enable And Disable USB Port Of Your PC

In this post i will show you how to disable all the USB ports of your PC. After disabling this USB ports you cannot use any of the USB device om your PC. This trick will also help you to protect your PC data from an external threat.

As this trick is an Registry trick i recommend you to Backup your Registry, if you are unaware of how to backup the registry, please click here to learn "How To Backup The Registry"

Thus there is no problem trying this trick on your PC, as i have also shown the trick to enable the USB ports but don't forget to Backup the Registry.
Let's get this job done.

• Click on START and then on RUN.
• Type REGEDIT in the dialogue box and press Enter.
• Now go to the following address,  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR.
• Search for the "START" key in the right side column, and double click on it.
• Change its Value Data from "3" to "4", now its done just close the registry and restart your PC.
• Check that all your USB ports are disabled.
• Now to re-enable the USB port just change the value data from "4" to "3" again

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