Formed PCB and fan

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I had a bad fan & took it apart, thinking I might claim the ring magnet (it's pretty strong).   I was impressed at the complexity of the assembly. 

 

Also you can see, the PCB is actually a formed plastic shape with various formed features and normal traces on the bottom.  Also note under the DIP IC, that there is a PCB molded support to position the chip exactly.   A LOT of thought went into this "pcb".   I suppose you can spare no expense when making fans by the hundreds (of thousands).

 

I was quite impressed & somewhat surprised to see that there is a factory cable connector on the pcb (rather than using soldered wires, to save more pennies).  The two-wire mate is in the 2nd photo.

 

Notice also, in the connector area, the board is stepped down (thinner).   This does NOT appear to be any sort of sandwich construction...the board is one piece.

 

 

The discontinued chip is interesting---it contains the hall sense & other driver & some protection goodies  (the rest of the pcb has three parts: 1A diode, a resistor, and a 1N4746)

https://datasheetspdf.com/pdf-fi...

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Fri. Jan 1, 2021 - 07:29 PM
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What size fan?  The blades are short but wide.

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>> I had a bad fan & took it apart

 

I understand, truly I do. Kids today, etc, etc, ...

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just a std 60mm 12V fan (Nidec brand).  Interesting you noted that sizing---wonder how many are like this??....also, is the metal center  better quality/performance? Maybe for higher temp (less warping/deforming??)

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Sun. Jan 3, 2021 - 01:25 AM
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That Mini Kaze looks good.

 

Noisy fans is why I build my own computers.  I bought a Windows 98 computer at Compuserve.  I put NT on it.  It was okay but the fan was too noisy.  I bought a bigger case for it and used a bigger fan which could run slower and quieter. 

 

The cases I use now take 12 cm fans.  They run slow and quiet and last almost forever.

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It was okay but the fan was too noisy.

I don't like quiet fans too much...sometimes I'll turn on several pieces of equipment to make enough humming noise to put me to sleep.  I find those big green pad transformers make a nice hum & the perfect place to take a nap.

 

 

I haven't seen metal hub muffin fans very often...seems like maybe they were more common before price erosion?

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!