One comment: others have well detailed the issues around top and bottom SMT
pads. Unmentioned was the fact that a pad can live on any layer, including
non-copper layers.
This can be useful; I've used it to get pads of a component out of the way
when I was using single-pad components to
At 01:10 PM 2/21/2002 +1100, Ian Wilson wrote:
There are a few workarounds. The one that I think is most documentable
but sometimes subject to Gerbering issues is the Lomax Virtual Short.
Note that Lomax himself now considers as at least equally satisfactory the
use of mech layer shorts
Jeez, you guys do things the hard way, I just use a zero-ohm resistor, it's
a standard part available from multiple sources in any size from 0201 up to
2512. This works especially well for maintaining multiple grounds with a
single point tie.
-Original Message-
From: Abd ul-Rahman
It is OK to put vias under components - I do it all the time. To deny this
is unnecessary, and would produce huge routing constraints.
What you need to be aware of, is to not put vias so close to the pad that
solder is wicked away from the part pin during reflow. This is typically
accomplished
hello,
i've got a negative (ECL) and a positive (TTL) power plane
on a board i'm doing. right now i'm figuring on a matching
ground plane for each power supply, spaced close to the
rail for switching capacitance. here's the stack i'm
thinking of:
critical traces
gnd
-5.2V
noncritical
Although they will work just fine in the right applications, beware of
zero Ohm resistors in high current and high frequency areas because they
are not really 0 Ohms. They have a finite resistance and will dissipate
heat. If you use them to bridge a path with significant current, you should
At 01:23 PM 2/21/2002 -0500, Darryl Newberry wrote:
Jeez, you guys do things the hard way, I just use a zero-ohm resistor, it's
a standard part available from multiple sources in any size from 0201 up to
2512. This works especially well for maintaining multiple grounds with a
single point tie.
At 01:43 PM 2/21/2002 -0500, Watnoski, Michael wrote:
I just check and you are correct, except when the display is in
transparent mode. In this mode the bottom overlay is always above the
bottom copper.
In transparent mode, the overlays are transparent. You may not see this if
you
Well by golly you got me there. I deal mostly with low power (3A), speech
or FM quality audio, and 100MHz digital IO. When I need an audio or PS
ground with a single tie point I use a zerohm resitor. And yes I look at Pd
to determine the size.
-Original Message-
From: Cliff Gerhard
Mike,
use this stack up
non critical
gnd
critical
-5
gnd
critical
+5 (better if this was ground)
non critical
or
gnd
critical
non critical
power
gnd
non critical
critical
gnd (if power switch critical and non critical)
two reasons why I say put the critical in the
Hello,
Is there any way within Protel 99SE's PCB tool to cause the view to be from
the bottom of the board rather than from the front?
Thanks,
Ray Mitchell
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Hi All,
This is what I've found out while trying to increase the performance of my
computer:
1). The file that was causing my processor to have 100% usage all the time
was a file called DNETC.EXE, which is located in the c:\windows\sytem
directory
Bob Jones
Digitized Technologies
2 Summit Road
Bob,
Actually that program only runs when your processor is idle, and
therefore doesn't impact Protel. However just in case you aren't aware
of what the program is, or recently downloaded it you should check the
following url- http://www.distributed.net/ . It appears some bad copies
are
On 12:13 PM 21/02/2002 -0800, Ray Mitchell said:
Hello,
Is there any way within Protel 99SE's PCB tool to cause the view to be
from the bottom of the board rather than from the front?
Thanks,
Ray Mitchell
Yes (sort of)
http://www.considered.com.au/Protel01.htm#CSFlipViewer
Geoff Harland
Greetings all,
Sorry for the repeat question...
I know there was just recently a discussion of this very subject a few weeks
ago, but since I had not (yet) run into the problem I skipped over it.
I have a 24 inch long flex board to output (very hot job) and I can't get
99se sp6 to output the
Robison Michael R CNIN wrote:
hello,
i've got a negative (ECL) and a positive (TTL) power plane
on a board i'm doing. right now i'm figuring on a matching
ground plane for each power supply, spaced close to the
rail for switching capacitance. here's the stack i'm
thinking of:
critical
On 03:18 PM 21/02/2002 -0500, Bob Jones said:
DNETC.EXE
Is a trojan according to a quick search on google. I think you will
probably want to do your own research on how to get rid of it. The
Symantec AV and the McAfee AV sites would be good starting points.
Ian
Mike, I've run into trouble by assuming the board house
would equalize dielectric thickness in the layer stack.
Some do, some don't.
I now add a fab note to equalize dielectric thickness +/- 10%
to get an approximately known dielectric thickness. Or you
can specify the prepreg thickness between
Are you really running w95? I suppose you may have noticed that w2k is the
currently preferred base OS for PROTEL. Although who can take a few days
off to reintall eberything and get it working.
Mike
-Original Message-
From: Bob Jones [mailto:[EMAIL PROTECTED]]
Sent: Thursday,
Bob,
This looks like a part of one of the distributed computing apps like the
Seti or United Device Cancer or Antrax project. Perhaps you had been a
participant at one time in something like that?
regards,
Tim Hutcheson
Institute for Human and Machine Cognition
40 S. Alcaniz St.
Pensacola, FL
Hi Randol,
Brian G. and others wrote a spiral track generator for
Protel. Use that.
OOooo!! Where's that?! Does it lock the tracks together so
that they don't get independently pulled and the group can be
drug together? I've not tried to make a footprint like
this, I've just
So the end result is your comp still freezes on text move for 2 seconds on 0805
and 12 secs for SOP? Thats way unacceptable performance.
In the table, the big jump is from DRC. Is it disabled using right
click/options/preferences/online DRC (unchecked)?
Are you using network licenses and
I have library parts for mounting holes and other hardware (i.e.
all PCB features exist on the schematic).
A consequence of this is that I can define an M3 mounting hole
component that includes a keepout definition. This definition is
usually a 360 degree arc on the keepout layer with an
At 02:25 PM 2/21/2002 -0500, Robison Michael R CNIN wrote:
hello,
i've got a negative (ECL) and a positive (TTL) power plane
on a board i'm doing. right now i'm figuring on a matching
ground plane for each power supply, spaced close to the
rail for switching capacitance. here's the stack i'm
My alternative for handling tie components would be to allow a flag
to attach to copper placed within a library component. The schematic
component for a net-tie would have two pins as per usual. Then the
PCB component would have two surface pads plus a drawn track or other
primitive which has an
On 10:00 AM 22/02/2002 +1000, [EMAIL PROTECTED] said:
5. Reinstall Service Pack 5
Then set your licences up again.
Or Service Pack 6 - I know that some people have problems with Service Pack
6 but I don't.
We have discussed this before but I can't recall the problems that were
introduced by
At 01:06 PM 2/21/2002 -0800, Evan Scarborough wrote:
Greetings all,
Sorry for the repeat question...
I know there was just recently a discussion of this very subject a few
weeks ago, but since I had not (yet) run into the problem I skipped over it.
I have a 24 inch long flex board to output
yes W95 may not be the prob, but i would say it is time to move on, it
may fix things by accident
Dennis Saputelli
Mike Ingle wrote:
Are you really running w95? I suppose you may have noticed that w2k is the
currently preferred base OS for PROTEL. Although who can take a few days
off to
There is one other way to make this problem go away and simply specify a
larger film size in the Advanced tab under Gerber properties, you can change
the numbers in the Film Size box to any dimension you want.
I have mine set at 20 x 16 inches, as I used to get the film too small
message once and
Is there any way within Protel 99SE's PCB tool to cause the view to be
from the bottom of the board rather than from the front?
Ray Mitchell
Yes (sort of)
http://www.considered.com.au/Protel01.htm#CSFlipViewer
Geoff Harland and I were working on a more difficult server to completely
At 05:11 PM 2/21/2002 -0500, you wrote:
Bob if it is just these two footprints and not others in your libraries try
deleting these two parts. They may be corrupted. I vaguely remember having
this problem years ago. Delete the parts save and exit Protel. Reenter
Protel and try to repair the
If anyone is interested, it is my belief that an off-line inverting
utility could be created
Although not the Holy Grail, I think an off-line utility would be a
sufficiently useful tool for the majority of my applications. I still use
Ian's viewer and find it useful for checking without
On 03:05 PM 22/02/2002 +1200, Steve Baldwin said:
3) Producing a placement file / drawing for the SMT parts. As far as
the SMT guy is concerned, that is the top side of the board.
You can already invert the mud-map - we do it all the time. An option in
the print setup / print preview setup.
mud-map
LOL! But is this term IPC approved like PWA and PWB?
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Geoff, my experience with mirroring layouts (now several years in the past)
was so disasterous that I gave it up. Connectivity of all copper objects
became completely unreliable, not to say trash.
Can 99SE/SP6 in fact mirror layouts and retain connectivity? Or are you
referring to mirroring as
Don't forget my Smooth Transition track size generator.
Open this link in your internet explorer:
ftp://ftp.point-lab.com/quartus/Public/ProtelUsers/
SmoothTrackSizeTransitionProtel.bas
Free Others:
InductorGeneratorProtelScript.bas - Generates continuous 'S' shaped inductors.
Geoff, my experience with mirroring layouts (now several years in the
past) was so disasterous that I gave it up. Connectivity of all copper
objects became completely unreliable, not to say trash.
Can 99SE/SP6 in fact mirror layouts and retain connectivity? Or are you
referring to mirroring
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