I recently bought these two AC-DC Power Supplies. One is "original" and I paid about $60 ... while the other I bought on Aliexpress for a few euros. I got both of them just to compare.

The $60 "expensive/original" one delivers 12V and I=2.1A (see also the link I attached above) while the "cheap" one delivers 12V and I=3.1A ... unfortunately I no longer have the link I bought it from.

I haven't tested the cheap one yet but I noticed an important difference:
- the $60 one weighs three times as much as the one bought on Aliexpress because (you can see right away) it has twice as many components!

Since I don't have the two schematics, I would like to ask you if you can tell what differences there are .. which components are missing in one than in the other.
Perhaps this question is meaningless since the only thing I am providing to you is a picture of the circuit without a schematic datasheet, however, I was interested in asking it anyway.

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"ORIGINAL" 60$:

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CHEAP ALIEXPRESS:

 

The £60 one has more filtering on the output, where as the £30 one hasn't but is easier to repair and modify. I have a few of these from AliExpress the 24V ones , they're great they use an 8 pin chip L* types.

 

The £60 one has more filtering on the output, where as the £30 one hasn't but is easier to repair and modify. I have a few of these from AliExpress the 24V ones , they're great they use an 8 pin chip L* types.

If I'm not mistaken, the filtering you're talking about is done exclusively with capacitors, and in fact there are a couple more and bigger ones ... am I wrong?
Because in addition to a few extra capacitors I also see for example these components that I circled:

What are the functions of the components I circled with colors?
The yellow and red are inductors if I'm not mistaken, the brown?

 

If I'm not mistaken, the filtering you're talking about is done exclusively with capacitors, and in fact there are a couple more and bigger ones ... am I wrong?
Because in addition to a few extra capacitors I also see for example these components that I circled:
View attachment 293755
What are the functions of the components I circled with colors?
The yellow and red are inductors if I'm not mistaken, the brown?

Hi,
The black round component is the fuse,in most cases it's characteristics is much higher than of the fuse in transparent glass case in the cheap unit -F1 . Interrupting rating is much higher. If shorted, the glass fuse will explode and splash melting metal around. Chokes in black tubing forms the RFI filter, to protect mains from electric noise. In fact, those AC/DC units generate an intense electric noise. A green component is a nonlinear resistance NTC, to reduce inrush current during startup. The component in yellow circle is choke , for output voltage smoothing. In fact, the expensive unit utilizes C-L-C filter, and the cheap utilizes C filter only

 

If I'm not mistaken, the filtering you're talking about is done exclusively with capacitors, and in fact there are a couple more and bigger ones ... am I wrong?
Because in addition to a few extra capacitors I also see for example these components that I circled:
View attachment 293755
What are the functions of the components I circled with colors?
The yellow and red are inductors if I'm not mistaken, the brown?

They are Chokes or inductors to help smoothing the output supply , you can add your own if needed, i have a 24V 20A type and made it variable 30 to 9V, the higher current types have better heat sinks and more filtering.