The journey of electrical /electronics engineering was
started more than250 years ago,
From that time many innovation has been done by
scientists.
At the very beginning scientists were aware only about
direct current(DC),
Then alternating current was invented, opening a new
age of electrical engineering, using alternating flux, transformer was
invented,
Day by day scientist begun to think on a component which
has a property of selectivity . first
came vacuum triode, after a very long time research transistors invented,
Then a new era of electronics engineering opened,
At the beginning there was only analog electronics,
What is analog electronics?
In analog system both input and output are continuous,
like a flow of water with in a pipe,
Suppose you have a pipe, the diameter of the input
channel is greater than the diameter of the output channel. Here you connect
the pipe with a pump, what would you notice?
You must notice that the speed of the water coming
from output channel , is greater than ihe input channel speed, like this
process a analog system works.
Day by day, with the help of Boolean algebra and using transistor and other semiconductor ,
various logic gates were implemented,
The age of digital electronics started.
How digital system works?
Digital system
works using Boolean algebra, there input and output is not continuous like
analog system, it works only using two state
1.
low(0) (amplitude is lower than defined value)
2.
high(1) ( amplitude is higher than
defined value)
suppose , you have some balls, and you are throwing
them one by one, one ball in one time, this may be an example of digital or
discreet system,
Programmable digital devices-
After the implementation of memory, which can store
digital data, then programmable digital devices came, program is stored in this
memory, and the device works according to the instructions of the program. There
are many programmable devices in the market, like microcontrollers( avr series
atmega16,atmega32, and pic series )
Now a days programmable
digital devices are widely used , because any type of work can be done using
different program , like an open source hardware.
There are many advantages in digital devices, but one
important disadvantage is , it is controlled by a program , any little change
in the program can corrupt the total system,
The program can be changed from outside.
This allows hackers to hack the system………………………………
In analog system there is no external control, so it
is free from hacking,
THE FUTURE WORLD-
Though the digital system has some drawbacks, for its
multipurpose functionality , it will be widely used I future,
But some special security purpose, analog system is
better………………………………………………………………
………………
THE FUTURE WILL WORK ACCORDING TO TODAY’S PROGRAM
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