Electronic noise

Electronic devices gives some noises while we using. Those noise must be reduced as much as possible.
The noises of  electronic systems is....

1. Thermal noise :
  Thermal noise is one which is produced by the over heat occuring while using that device.

2. Flicker noise or low frequency noise :

   These noises are produced by the low frequency...

3. Short noise

4. High frequency noise :

  These noises are produced by the high frequencies.

Modulation techniques

Modulation is one of the process in communication. By the modulation only we can achieve long distance communication...

Modulation:
Modulation is defined as change in the carrier signal with respect to message signal is called as modulation...

That means the original signal is transmitted with  the carrier. Then carrier carried signal which is very high frequency signal.

Commonly modulation is great thing by this we can achieve ...
1. Practicality of antenna
  That means with this we can construct less height of antenna..
2.low noise:
By this technique we can achieve low noise
3. Long distance communication

Modulation techniques are mainly two types those are...
1. Analog modulation
2. Digital modulation

1. Analog modulation :
This modulation is performed in the analogue signals.
This modulation is divided into  three types those are...
A. Amplitude modulation
B. Frequency modulation
C. Phase modulation

2. Digital modulation :
 This modulation performed in the digital signals that is this is in binary format.
PCM... Etc are digital modulation techniques.

Filters in electronics

Commonly filters are used to remove the unwanted signal , which means  noise. Noise is commonly occur when we sharing data from one to others. In transmission part noise occur, that makes disturbances.

Filters placed in the reciever section because there only we have to get pure part of information....

Filters are mainly four types those are as follows....
1. Low pass filters
2. High pass filters
3. Band pass filters
4. Band reject filters

1. Low pass filters :
   The filters which are allow below cut-off frequency those type of filters we called as low pass filters

2. High pass filters :
The filters which are allowing only the above certain cut-off frequency those filters we called as high pass filters.

3. Band pass filters: 
The filters those are allowing only the certain band of frequency those type of filters are called as band pass filters.

4. Band reject filters: 
The filters those are used for reject teh certain band of frequencies and allow all other frequencies. These type of filters
we called as band reject filters....

In this we have notch band pass and band reject filters....

Electronics introduction

Electronics is one the major application oriented one. This electronics system are the system which  are used for embedded systems and these systems must provide low power . If we provide high power then that systems may get damage or destroy.....


In the electronic systems major components are .....

Resistors
Capacitors
Inductors
Diodes
Transistors
.....

Resistors --- these are used to reduce the flow of current. Current is commonly say as flow of electrons...

Capacitor ---- it is used to store electrical energy. It don't accept sudden changes. That means it stores the dc energy and ac is transmitted without any change....


Inductors ----
Inductors are used for the filters. Inductors are used for storing of magnetic energy these devices are storing magnetic and transmitting electrical energy .

Diodes --- these are the elements which are made up of silicon. In this we use pn junction. These are used for dc to ac converters,  voltage clamping, Voltage clipping...

Transistors -- these are two junction diodes. These transistors are used for switch. That means transistors are using storage elements....


These are the main components to manufacture electronics system....