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This lesson is about the microphone circuit

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Mainly from the following four aspects

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First, the code name and function of the microphone in the circuit,

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as well as its distribution position

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Second, the related circuit of the microphone

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Third, find the microphone in the drawing

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Fourth, microphone failure and maintenance

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Let's first look at the appearance and function of the microphone

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In appearance, the microphone is generally golden yellow,

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mainly located on the edge of the phone

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Its function is to send the voice, or to collect the sound,

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and convert the sound into an electrical signal

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When making a call, it turns the sound into an electrical signal,

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and finally transmits it to the other party through the processing of the circuit,

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turning it into a sound that the other party can hear

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What are the faults caused by the microphone?

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When making a call or sending a voice message, others cannot hear the sound

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This means that the microphone circuit of our mobile phone is faulty

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Another thing is that when we click on the recording function,

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we cannot record, or there is noise in the recording, or the recording sound is small,

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all of which are caused by the microphone circuit

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What are the microphones in mobile phones?

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There are two microphones in total

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For Android phones, it has a secondary microphone at the top of the phone,

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and a primary microphone at the back of the phone

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Let's first look at the position of the secondary microphone

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The secondary microphone is located on the top of the mainboard

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Usually the microphone of the Android phone is soldered on the mainboard

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This is the secondary microphone, it's soldered to this big board

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The picture on the right shows the secondary microphone

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This is another mainboard, this one is also a secondary microphone

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It's also on the edge of the logic board, on top of the entire phone

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What are the functions of the secondary microphone?

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When we turn on the hands-free when we make a call,

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this microphone will collect our voice, transmit it to the circuit,

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and finally transmit it to the other party's mobile phone

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There is also a function of video calling

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We turn on the video call, such as using WeChat,

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at this time the microphone should be turned on and working

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Also, when we are filming, the sound recording in the video relies on this secondary microphone

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The fault caused by the secondary microphone is that its function is gone,

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and the sound is not collected.

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For another example, when we are on a video call,

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if the other party cannot hear our voice,

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it proves that the secondary microphone circuit or secondary microphone of the mobile phone is faulty

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Another is that when we go to record the video, the whole video has no sound,

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which is also caused by the fault of the secondary microphone

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That's all for this lesson