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This lesson talks about the related circuits and related components of the earpiece

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First look at the position of the earpiece

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The earpiece is located on the top of the phone

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The picture on the right is a disassembled Huawei mobile phone

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Its earpiece is here

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This is another model, it also has the earpiece on the top

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The design should conform to ergonomics.

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When we make a phone call, we use our ears to hear the sound,

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so the ear should be close to the receiver

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It is necessary for us to understand the connection between the earpiece and the mainboard in the mobile phone

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The first type, such as the Huawei P40 model in the picture, its earpiece is close to the direction of the screen

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The screen is covered and its contacts are below

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The two contacts of the earpiece are the earpiece signal, which comes from a large audio or small audio amplifier

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The signal that drives it touches the position of the earpiece through the contacts

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to drive the earpiece to make a sound

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This is connected by shrapnel

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There is another way to connect the earpiece, which is connected by the cover plate that fixes the mainboard

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For example, like this, the shrapnel of the earpiece is suspended here, and the mainboard has been put down

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The shrapnel on the mainboard are these two

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If it wants to transmit this signal, it must rely on the cover plate that fixes the mainboard,

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and the coating on the cover plate transmits the signal of the earpiece

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It looks like this

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This contact point is connected to this position

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This is a cover for fixing the mainboard

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This white is the conductive layer

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It hits here, this wide spot hits these two shrapnel

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In this way, the earpiece signal can be transmitted from the mainboard to the earpiece.

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This is the connection between the earpiece and the mainboard, and there are two types of common

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The reason why there is no sound from the earpiece

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Generally speaking, is that there is a problem with the large audio frequency

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It is impossible to send the voice signal of the other party to the earpiece when making a call,

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so as to restore the voice of the other party

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First, a problem with the large audio will cause the earpiece to be silent

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Second, a problem with the channel sent to the earpiece will also cause no sound from the earpiece

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Third, if there is a problem with the earpiece, it will also cause no sound

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In fact, three aspects are emphasized here

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It's a normal earpiece, it's powered by big audio

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Now some earpieces are driven by small audio

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It is necessary to replace the large audio with a small audio, and the others are the same

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It should be noted here, what does it mean that the earpiece is driven by small audio,

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that is, the earpiece can play music, this is stereo or double speakers

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Many phones now support stereo sound

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That's all for this lesson