Unit I Number System:
Electrical signals are in two forms;
Electrical signals are in two forms;
- Analogue signals
- Digital signals
Analogue signals:
These are usually older electronic gadgets (introduced before the mid 1990’s). 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.
Digital signals:
Examples of analogue systems include;Old radios, megaphones and the volume control on old telephone hand sets.
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.
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 1’s and 0’s.
1 = ON
0 = OFF
Post a Comment