Microphone: Difference between revisions
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[https://en.wikipedia.org/wiki/Microphone '''Microphones'''] convert sound energy into electrical energy. There are a number of types :- | __TOC__ | ||
=====Description===== | |||
[https://en.wikipedia.org/wiki/Microphone '''Microphones'''] convert sound energy into electrical energy. | |||
=====Features and Applications===== | |||
There are a number of types :- | |||
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'''Crystal or | '''Crystal or Piezo''' - sounds hitting the Piezo material causes minute currents to flow. | ||
'''Capacitance''' - when sound hits the diaphragm it varies the gap and hence the capacitance. As the microphone needs to be polarised (i.e. have a fixed voltage applied across it), varying the capacitance also varies the voltage and therefore gives a true representation of the sound at the output. | '''Capacitance''' - when sound hits the diaphragm it varies the gap and hence the capacitance. As the microphone needs to be polarised (i.e. have a fixed voltage applied across it), varying the capacitance also varies the voltage and therefore gives a true representation of the sound at the output. | ||
{{Bells/Buzzers/Mics/Speakers Buyers Guide}} | |||
[[Category:Secondary]] | [[Category:Secondary]] | ||
[[Category:Electronics Components]] | [[Category:Electronics Components]] | ||
Revision as of 15:08, 3 July 2016
Description
Microphones convert sound energy into electrical energy.
Features and Applications
There are a number of types :-
Moving coil - similar in construction to a loudspeaker but working in reverse. The sound vibrates the diaphragm which in turn moves the coil and induces an emf into it.
Crystal or Piezo - sounds hitting the Piezo material causes minute currents to flow.
Capacitance - when sound hits the diaphragm it varies the gap and hence the capacitance. As the microphone needs to be polarised (i.e. have a fixed voltage applied across it), varying the capacitance also varies the voltage and therefore gives a true representation of the sound at the output.
