Disassembling the USB wireless network card, the circuit scheme is very classic

ohahaha

Disassembling the USB wireless network card, the circuit scheme is very classic [Copy link]

 

Many desktop computers do not have wireless network cards and can only be plugged in with a network cable.

If you want to use WiFi, just plug in a USB wireless network card, it's simple and convenient:

The USB wireless network card is so small that you might wonder how the circuit board is stuffed in there:

Here is a disassembly of one of the manufacturers:

Another angle:

Pry open the part covered by plastic and you can see the light blue antenna:

The entire circuit board was taken out, revealing a small and compact circuit board, which is very beautiful:

The USB wireless network card uses the solution of Realtek Semiconductor, and the chip model is RTL8188CUS:

Partial details of the ceramic antenna. The ceramic antenna is mainly used because of its small size:

The back side of the circuit board is shown in the picture below.

There is a black chip packaged as SOT23-5 on it. It is a power chip with 5 pins and realizes the function of 5V to 3.3V:

Remove the key components, from left to right and from top to bottom in the figure below:

1. Blue ceramic antenna;

2. Golden crystal oscillator;

3. Black main chip RTL8188CUS;

5. 5V to 3.3V power chip.

The internal circuit of the main chip was damaged when it was disassembled:

The microscopic circuit world is so beautiful:

Open the cover of the crystal oscillator and take a look at what is inside:

Compare this to a USB WiFi module made with the same chip solution: (and the girl’s hands without manicure)

This module is also small, but because it uses a PCB antenna, it is relatively larger:

Mark the key components:

REALTEK Semiconductor's RTL8188 hardware and software solution is very mature and has been in mass production for many years, but it is not certain whether it is still a competitive solution at present.

This article is mainly an appreciation of beautiful pictures. If you want to make it yourself, just find a chip agent to get schematics and other reference design materials. It is very simple.

book1

I also bought one, it is very useful, but now it is discarded in a corner. I will take it apart and have a look at it when I have time, especially the internal part of the chip, haha!

soso

book1 Published on 2021-5-16 07:13 I also bought one, it is very useful, now it is thrown away in a corner, I will take it apart and have a look when I have time, especially the inside of the chip, ha!

Looking forward to it haha

book1

soso posted on 2021-5-17 10:20 Looking forward to it haha

There is no other way, curiosity drives me: dissolve the shell or use fire, hammer, axe... Anyway, knowing a little more than before is progress!

soso

book1 Published on 2021-5-17 13:09 There is no other way, curiosity drives us: dissolving the shell or using fire, hammer, axe... Anyway, knowing a little more than before is progress!

Yeah haha

ohahaha

book1 Published on 2021-5-16 07:13 I also bought one, it is very useful, now it is thrown away in a corner, I will take it apart and have a look when I have time, especially the inside of the chip, ha!

Ha, I'm waiting for you to share it after you take it apart.

book1

ohahaha Posted on 2021-5-20 16:37 Ha, waiting for you to share after you tear it down

I don't know what solvent is good, I'm looking for it now (ha!), I don't know what it will look like when I magnify it 3000 times (optical)? Sorry, I'm a newbie, it's all DIY (ha!)

tornadox

This design really minimizes the cost.