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Motherboard inductors

W

Winfield Hill

Jan 1, 1970
0
Winfield Hill wrote...
The inductors are wound with three paralleled #14 wires, for a
calculated Rdc = 0.8 milliohms (and measured, below 1 milli-ohm).
We know the inductor's ac resistance may be higher due to skin and
proximity effects, so this issue bears more detailed examination.

Correction, it's three #18 wires. However the 0.8 milliohm dcr
calculation is correct, having been made for #18 wires.
 
W

Winfield Hill

Jan 1, 1970
0
Alan Turner wrote...
Hi Win,

[fascinating switching regulator analysis snipped]

Thanks very much for the description of this power supply Win!
I found it very interesting. Posts like this one make s.e.d.
really worth the reading time :)

Thanks for your kind comments, Alan! I hope some of the others
enjoyed it as well. It's a long article and is best read by
downloading and studying the Intel article and the referenced
datasheets, so that's a time-consuming scene, hours even.

Alan, were you able to view the two mobo pictures I posted on
a.b.s.e.? I saw the first large picture, but I can't see the
closeup I posted last night, my newsreader says it's incomplete.
 
J

John Woodgate

Jan 1, 1970
0
I read in sci.electronics.design that Winfield Hill
Alan, were you able to view the two mobo pictures I posted on
a.b.s.e.? I saw the first large picture, but I can't see the
closeup I posted last night, my newsreader says it's incomplete.

One part arrived here as a part of a multiple-part posting, and the
other as a binary rendered as text. Your news client seems to have a
problem with sending attachments.
 
A

Alan Turner

Jan 1, 1970
0
Hi Win,

Thanks for your kind comments, Alan! I hope some of the others
enjoyed it as well. It's a long article and is best read by
downloading and studying the Intel article and the referenced
datasheets, so that's a time-consuming scene, hours even.

Properly studying the Intel document is still on my to-do list, but I
think I will have a go at it! It really amazes me that these power
supplies work at all. The fact that the complete motherboard is $100 or so
really boggles the mind.
Alan, were you able to view the two mobo pictures I posted on
a.b.s.e.? I saw the first large picture, but I can't see the
closeup I posted last night, my newsreader says it's incomplete.

I can only see one post with an attachment in the ASUS thread. The file
name of the attachment is "asus_p4c800.jpg" but I can't decode it because
part 1 is missing (I have part 2 of 2).

Thanks!

Regards,
Alan
 
W

Walter Harley

Jan 1, 1970
0
Tim Shoppa said:
I'm completely flabbergasted that umpteen-layer ATX motherboards are
availble for $30 with all that stuff already on it.

That's the way they are when they come out of the circuit board mines in
China, so there's very little additional processing involved. The reason
individual components are so expensive is that they have to manually
unsolder them from the motherboards, and there's a lot of wastage in that
process.

Analog components are especially expensive because they have to search
through a lot of boards to find them; also, the boards with analog
components tend to be buried in deeper strata, so it's more expensive to get
to them.
 
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