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Re: gEDA-user: Compiling MMI (electromagnetic simulator)
- To: geda-user@xxxxxxxx
- Subject: Re: gEDA-user: Compiling MMI (electromagnetic simulator)
- From: Karel Kulhavy <clock@xxxxxxxxxxxxx>
- Date: Sun, 12 Dec 2004 09:54:14 +0000
- Delivered-to: archiver@seul.org
- Delivered-to: geda-user-outgoing@seul.org
- Delivered-to: geda-user@seul.org
- Delivery-date: Sun, 12 Dec 2004 04:55:28 -0500
- In-reply-to: <20040824013331.GQ350@bondage.mcmahill.net>
- References: <20040822181334.GB21784@beton.cybernet.src> <20040824013331.GQ350@bondage.mcmahill.net>
- Reply-to: geda-user@xxxxxxxx
- Sender: owner-geda-user@xxxxxxxx
- User-agent: Mutt/1.4.2.1i
On Mon, Aug 23, 2004 at 09:33:31PM -0400, Dan McMahill wrote:
> On Sun, Aug 22, 2004 at 06:13:34PM +0000, Karel Kulhav? wrote:
> > Hello
> >
> > MMI promises to compute distributed paramteres of copper strips on
> > PCB.
>
> looks neat once it can be built. I've started and found some issues
> with the build system. Haven't fixed them all yet...
>
>
> > I am lured by an idea of computing how many picoforad 1cm^2 of PCB trace on my
> > 1.5mm FR-4 board makes.
>
> try out mcalc.sf.net to find impedance (sqrt(L/C)) and velocity (1/sqrt(LC)) of
> your line and then solve for L and C.
Yes it works thanks.
>
> Thats useful for lines which are relatively long compared to their width.
> for a simple parallel plate thing like what you have, you can
>
> a) note that 1cm is a good bit more than 1.5 mm so just use C = eA/d
> (e = permitivitty of FR4 which is around 4.8x free space permitivitty)
> (A = area)
> (d = distance)
>
> or
>
> b) use something like fastcap if you want a more accurate field solution.
This Project Has Not Released Any Files
http://sourceforge.net/projects/fastlc/
Don't you know where to download it's files?
I didn't find it on freshmeat and opencollector.
Cl<