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ANALOGUE AND DIGITAL SYSTEMS

V. Ryan 2002 - 2009

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Electrical signals are in two forms;

Analogue signals
Digital signals

 

   

This graph is typical of analogue signals.

Analogue signals: These are usually older electronic gadgets (introduced before the mid 1990s). A good example of an analogue signal is the loud-speaker of a stereo system. When the volume is turned up the sound increases slowly and constantly.

Examples of analogue systems include;
Old radios, megaphones and the volume control on old telephone hand sets.

 

   

 

 
 

This graph is typical of digital signals

Digital signals: Modern electronic products such as computers and mobile phones depend on digital signals. However, a good example of a digital signal is Morse Code. The signal is sent as a series of on and off pulses. The signal is either present or it is not. Morse code was introduced in 1837 by Samuel Morse, as a method of communication.


For further information on digital computers - see Bits and BYTES.
 

 

   

Both analogue and digital systems can be used as sensors. A thermistor is analogue as resistance slowly changes, a micro-switch is digital, as it is on or off.

Computers are digital devices and the various electronic parts communicate using 1s and 0s.

1 = ON

0 = OFF

   

 

   
LIST EXAMPLES OF ANALOGUE SYSTEMS LIST EXAMPLES OF DIGITAL SYSTEMS
   
   
   
   
   
   
   
   
 

  

 

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