I know what the website says, I also know what my hard earned money
says... I just purchased manuals about 2 months ago and had to pay full
price.Read my last post again , The IPC will not accept your coupon
unless you are full member of the IPC, however they did honor the coupon
from
At 07:22 AM 7/10/01 -0400, Mike Reagan wrote:
I know what the website says, I also know what my hard earned money
says... I just purchased manuals about 2 months ago and had to pay full
price.Read my last post again , The IPC will not accept your coupon
unless you are full member of the
Mike,
What standards did you purchase? I believe that if you are a IPC
designer council member you can only purchase standards, visit seminars, and
use your coupon on subjects related to design. So assembly stuff is out.
Abd ul-Rahman,
I just attended a IPC cert. course. There
Hello,
Thanks for all the information in the Layer Stackup Info. string!
Would anyone give me an example of a board stackup (4 layer) for a 80 mil
thick PCB and a 62 mil thick PCB?
I don't have the IPC standard for prepreg. The PCB is specified as 80 mil
for mechanical
reasons only. The PCB
it was all the latest 2141, controlled Z, 6011 generic standards, 6012 and
several other design standards. Maybe I got snuckered, Like I mentioned
they honored it last year but not this year. I will bring it up at the next
IPC meeting and see if anyone else had the same problem
Mike
-
Ted or Mark,
I hope you realize that those figure will be approx. averages for
differing materials of the general construction type. Don't rely on those
figures too heavily because individual constructions, resins and weaves
could vary those figures significantly (at least 10 - 15%,
Greetings all,
I am contemplating adding a stitched perimeter of grounded
vias on my board outline to reduce generating noise and EMI.
My board is an embedded microcontroller application
that runs at 33 MHz .
-Is this technique effective in reducing generated noise?
-Is there an easy way
Mamdouh,
after reading your question I believe that you may be under some
misconceptions.
It seems that you are talking about stitching vias around the
perimeter of the PCB only. If this is the case you will see very little
reduction of radiated emissions or susceptibility to
Folks,
Can anyone help me with specifications for Silver Immersion finish?
I have been encouraged to move from Gold Immersion to Silver, but I
am unsure as to how best specify it and what issues are involved. I
am requesting information from our PCB manufacturers, but look
forward to feedback
Colin,
I was following a similar path several months ago and it came to an
abrupt end when the manufacturers of the processes stopped returning my
calls or forwarding information. I had three vendors who wanted to use the
immersion silver on our boards but I couldn't get suitable
Couldn't find the other book I was looking for, Abd ul-Rahman, what was
the
title of your favorite book?
The one that has voodoo, black magic or something like that in the title.
High Speed Digital Design: A Handbook of Black Magic
by Howard W., Ph.D. Johnson, Martin,
Brad,
No I haven't tried any OSPs. We have been using Gold Immersion and HASL only.
Any sources I find will largely be in Australia as I work there. However,
we have a
division in Tempe which have access to the Silver technology. If I can find out
more I'll let you know.
At 05:05 PM
Brian,
wave length = 300/freq (Mhz)
Darren
-Original Message-
From: Brian Guralnick [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 11 July 2001 14:29
To: Protel EDA Forum
Subject: [PEDA] Off topic / Need formula to calculate F in
Mhz Wave length.
Hi all,
This is fine for free space, but if you're trying to calculate the
wavelength in something like coax you have to take into account the change
in velocity:
Wave Lenght (in meters) = (VF.c)/f
Where VF = velocity factor (about 0.6 for RG59)
c = speed of light in vacuum in m/s
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