Archive for July 2016

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<span style="color: #674ea7; font-family: "arial" , "helvetica" , sans-serif; font-size: large;"><b>Unit </b><b>I Number System:</b></span><br />
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<b><span style="font-family: "verdana" , sans-serif;">Electrical signals are in two forms;</span></b><br />

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<li><b><span style="color: #0b5394; font-family: "verdana" , sans-serif;"><i>Analogue signals</i></span></b></li>
<li><b><span style="color: #0b5394; font-family: "verdana" , sans-serif;"><i>Digital signals</i></span></b></li>
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<b style="text-align: justify;"><span style="color: maroon; font-size: large;">Analogue signals</span></b><span style="text-align: justify;"><span style="font-size: large;">:</span> </span></div>
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<span style="font-family: Verdana, sans-serif;"><span style="text-align: justify;"><span style="font-family: Trebuchet MS, sans-serif;">These are usually older electronic gadgets (introduced before the mid 1990’s). A good example of an analogue signal is the <b>loud-speaker</b> of a stereo system. When the volume is turned up the sound increases slowly and constantly. </span></span><span style="font-family: Trebuchet MS, sans-serif;"><br style="text-align: justify;" /><br style="text-align: justify;" /><span style="text-align: justify;">Examples of analogue systems include;</span></span><span style="text-align: justify;"><b><span style="font-family: Trebuchet MS, sans-serif;">Old radios, megaphones and the volume control on old telephone hand sets.</span></b></span></span><br />
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<span style="text-align: justify;"><b><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEig52N4zvX_yKArpLsyXnWSYsa6rzPqpMOFBmnVXCjBGmoJvbKqSHv3FnDsvuJ_oyM8OhrGssR7aasPCCC3LWTCpnH5y8pdfIc4AIVDXA7_AGIL-y8boCNIO_1ghH9vE9yf8LKUxxG6-qk/s1600/analog1a.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEig52N4zvX_yKArpLsyXnWSYsa6rzPqpMOFBmnVXCjBGmoJvbKqSHv3FnDsvuJ_oyM8OhrGssR7aasPCCC3LWTCpnH5y8pdfIc4AIVDXA7_AGIL-y8boCNIO_1ghH9vE9yf8LKUxxG6-qk/s1600/analog1a.gif" /></a></b></span></div>
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</b></span><b style="text-align: justify;"><span style="color: maroon;"><span style="font-size: large;">Digital signals:</span> </span></b></div>
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<span style="text-align: justify;"><span style="font-family: Verdana, sans-serif;">Modern electronic products such as computers and mobile phones depend on digital signals. However, a good example of a digital signal is Morse Code. </span></span></div>
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<span style="text-align: justify;"><span style="font-family: Verdana, sans-serif;">The signal is sent as a series of ‘on’ and ‘off’ pulses. The signal is either present or it is not. </span></span></div>
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9KRiqa9xAXW_zi4KzWfQ-srDwFSNwBNsnlGsyHRED3z6GuPx0I4qDTARrlqc7R8h-gYXNY2l8ADsuj7TVvqK7bsxeqcYai-9xnXPVlFheq9Sx3H4iuHamBvE-zocI0wivu-lXDcWfUuA/s1600/digi1.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9KRiqa9xAXW_zi4KzWfQ-srDwFSNwBNsnlGsyHRED3z6GuPx0I4qDTARrlqc7R8h-gYXNY2l8ADsuj7TVvqK7bsxeqcYai-9xnXPVlFheq9Sx3H4iuHamBvE-zocI0wivu-lXDcWfUuA/s1600/digi1.gif" /></a></div>
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<span style="font-family: Verdana, sans-serif;">Both analogue and digital systems can be used as sensors. </span></div>
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<span style="font-family: Verdana, sans-serif;">A <b>thermistor </b>is analogue as resistance slowly changes, a micro-switch is digital, as it is ‘on’ or ‘off’.</span></div>
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<span style="color: #cc0000; font-family: Verdana, sans-serif;"><i>Computers are digital devices and the various electronic parts communicate using 1’s and 0’s.</i></span></div>
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<span style="color: red; font-family: Verdana, sans-serif;"><b>1 = ON</b></span></div>
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<span style="color: red; font-family: Verdana, sans-serif;"><b>0 = OFF</b></span></div>
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Digital Electronics: Unit I - Number System

Unit I Number System: Electrical signals are in two forms; Analogue signals Digital signals Analogue signals : These are usu...

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Digital Electronics: Unit I - Number System

Syllabus for F.Y.B.Sc.I.T. with effect from the academic year 2016 – 2017 (Mumbai University)

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