ELECTRONICS: the branch of engineering which deals with
current conduction through a vacuum or gas or semiconductor is known as
electronic.
ANALOG SIGNAL: A continuously varying signal (voltage or
current) is called an analog signal
For example:
sinusoidal voltage.
Digital signal: A signal
which can have only two discrete values is called a digital signal.
For example a square
wave is a digital signal.
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Digital circuit : An electronic circuit that handles only a
digital signal is called a digital circuit.
Uses of digital Circuit : communication , transportation, medicines,
industrial ,automation , manufacturing controls etc.
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