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Message: <blockquote data-quote="laal" data-source="post: 8736156" data-attributes="member: 94459">Understanding Mouthpiece or Microphone, Earpiece and IHF or Buzzer Speakers Circuit oA mobile phones microphone or mouthpiece is a component used to  convert sound signal into an electrical signal. The earpiece speaker is  the one that converts electrical signal into a sound signal, likewise  also the IHF , buzzer or ringer speaker do.These certain parts works as a user interfaces components on a mobile phone. And controlled by an <a href="http://cellphonerepairtutorials.blogspot.com/2010/05/how-audio-codec-do-on-mouthpiece.html" target="_blank">Audio Codec Circuit</a> which is the part that relatively controls and converts all audio frequency signal.see picture below<a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S_Li6I27zCI/AAAAAAAAAYU/yl-vIJXXvG4/s1600/audio%20circuit%20schematic%20diagram.jpg" target="_blank"><img src="http://4.bp.blogspot.com/_8JZhVVmpICU/S_Li6I27zCI/AAAAAAAAAYU/yl-vIJXXvG4/s400/audio%20circuit%20schematic%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>A picture below is an schematic diagram microphone or mouthpiece circuit,A typical and modern designed  of mouthpiece circuit is being protected by an <a href="http://cellphonerepairtutorials.blogspot.com/2010/04/emi-esd-filters.html" target="_blank">EMI- Filter</a>  to prevent sound interruption, before it then feeds the audio signal to  the audio codec circuit. Some microphone circuit other mobile phones  have no EMI Filter like the one showed below. The microphone line signal  is being presented into positive and negative polarity, and those two  polarity lines is being filtered again by two capacitor after being pass  by from an EMI-Filter, in order to remove the DC (direct current)  coming from the EMI-filter.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S_Li-EkwjkI/AAAAAAAAAYY/5LrhNyVCoXQ/s1600/mic%20circuit%20diagram.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S_Li-EkwjkI/AAAAAAAAAYY/5LrhNyVCoXQ/s400/mic%20circuit%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>The earpiece circuit is also filtered by inductor coil to reduce sound saturation cause by any radio frequency interruption.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S_Llu62i8PI/AAAAAAAAAYc/k23kcBZ3xsw/s1600/earpiece%20circuit%20diagram.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S_Llu62i8PI/AAAAAAAAAYc/k23kcBZ3xsw/s400/earpiece%20circuit%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> And same also in an IHF speaker circuit. The IHF speaker also have two lines which is positive and negative line.<a href="http://4.bp.blogspot.com/_8JZhVVmpICU/S_LmD_XVHFI/AAAAAAAAAYk/Jr6uND4SzAk/s1600/ihf%20speaker%20circuit%20diagram.jpg" target="_blank"><img src="http://4.bp.blogspot.com/_8JZhVVmpICU/S_LmD_XVHFI/AAAAAAAAAYk/Jr6uND4SzAk/s400/ihf%20speaker%20circuit%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>A vibrator motor although this is not a sound converting device but it  generates a vibration which generates sounds, this one is also included  in audio circuitry.<a href="http://3.bp.blogspot.com/_8JZhVVmpICU/S_LmF2UyT2I/AAAAAAAAAYo/7ItKkhjMI74/s1600/vibrator%20circuit%20diagram.jpg" target="_blank"><img src="http://3.bp.blogspot.com/_8JZhVVmpICU/S_LmF2UyT2I/AAAAAAAAAYo/7ItKkhjMI74/s400/vibrator%20circuit%20diagram.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>Here's  an example mapping layout of a Microphone, Earpiece, IHF speakers and  Vibrator  motor connections on a mobile phones printed circuit board.  Each connection were both separated and apart from each other but all   of each line is being pointed towards in audio codec circuit.<a href="http://1.bp.blogspot.com/_8JZhVVmpICU/S_Lqt4_hbNI/AAAAAAAAAYs/twACHxH7Pvg/s1600/the+audio+circuit+layout.jpg" target="_blank"><img src="http://1.bp.blogspot.com/_8JZhVVmpICU/S_Lqt4_hbNI/AAAAAAAAAYs/twACHxH7Pvg/s400/the+audio+circuit+layout.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a>The  above picture is only an interpretation of how audio circuit is being  connected or mounted in a mobile phones printed circuit board.</blockquote>

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