If you are interested in DIY electronic products, you can't miss reading this article because it is to show you how a miniature earphone is made. Now, let's begin!
Below is the circuit diagram of the miniature receptor.
Below is the circuit diagram of the miniature receptor.
The mini receptor that is the miniature earphone is only a quarter of a coin. Most of the materials on surface are 0402 resistor and capacitor. Therefore, the welding requirements are high.
On the left is a connector of a charger and it is used for micro lithium battery charging. On the right is an inductance made by oneself. The middle is chip TDA7021.
Below is an earphone mic. Take it apart and put a board and battery into it.
The lithium battery (3V) and outer skin of the earphone are as below picture shows.
Please see the below chart. How small the earphone is!
Put the receptor circuit board into the outer skin of the earphone. The underneath is the earphone speaker, middle is battery and the up is receptor. (As below)
Below is the diagram for PCB's top layer of the miniature receptor.
Below is the diagram for bottom layer of the miniature receptor.
This miniature receptor consists of double layer PCB. Drill a hole as slim as your hair in the PCB. You need to grind the 0.5mm swivel to 0.22mm. Be careful for it is so easy to broken.
Finally, the miniature earphone is completed.
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