Electronics Forum / CAD / July 2007

I wrote my own PCB design software, which outputs Gerber and raster.
One thing that puzzles me, when I see some PCB's (made by others) where
the surface mount IC's are at a 45 degrees angle vs the rest is, how do
they define those IC pads in Gerber? It can't be done with a ...

Is there a way to get the PCB trace from FreePCB to AutoCad?  I was
hoping that I would get lucky and just be able to copy and paste but
that hasn't worked at all.
I just gave CDNEX a shot too but without any luck.  CDNEX is supposed

One of us here is a Protel 99 SE user, and has
developed a strange problem on his Acer laptop,
running Windows XP.  The program seems to
startup, and shows its splash screen for a few

I simulate a passive high-pass filter with a 1 pF capacitor and a 50
Ohm resistor.
I simulate reom 10 to 100 GHz
With the waveform tool I measure the -3 dB frequency to be 3.19 GHz

I need a licens to protel 99se, is there any that I can buy.
regard Rene

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As demonstrated in the OrCAD® product 16.0 release, Cadence® continues to
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one that grows with you as your PCB designs grow in complexity. We've all

I've been looking online at different plans for etching tanks and had
an idea that I hadn't seen applied anywhere.  I'm wondering if anyone
has built a setup that had an etch tank and water tank that shared a
common wall.  The heating element would be on the water side, so that

Does anyone have a schematic for a 8(or more, you now what they say
the more the better) LED Flasher that will flash LEDs in a random
sequence

Is there any pcb design program that has component libarys that have 7 pin
and 8pin and 9 pin  vacuum tube sockets?
Thanks.

I am trying to model a current clamp in Spice based on a mathematical
model which uses frequency dependent inductances.
I have seen various articles on using Laplace code blocks for
frequency dependent expressions, but these don't seem to behave

Hello all- I have been making progress learning Altium's schematic and
library editors - although I haven't yet attempted PCB layout - but there is
one nagging issue with PCB footprints that I can't seem to conquer. It is so
basic, but I can't find anything printed or a video to ...

i accidentally clicked save colors after right clicking top layer in
post process setup. After that, when clicked preview for this layer,
it showed everything (not just top layer). Then i changed color setup
for top layer to show only background(in white) and Top layer (in

designing a motherboard featuring a Virtex-4 FX140 FPGA with 24 integrated
RocketIOs (Gigabit SerDes IOs) I am now facing the problem of how to get the
signals off the board in a most space-saving and elegant way?
All 24 differential signals will be connected to some DACs outside ...

Could you tell me. Do you work in multi person on one PCB in Altium Designer
2004? Do you route PCB in the same time on one layout? Do you work in this
case in Altium
Thank you for our help

Just wondered if anyone did something like this
I have two pcb layouts done with the opensource pcb program
layout 1 is for the top board
layout two is for the bottom board