On Sat, May 06, 2006 at 12:49:48AM -0400, DJ Delorie wrote:
>
> > I am using the cheapest possible boardhouse for 4 layer.
>
> Who? I've started peeking at 4 layer prototype deals for the second
> furnace controller, the best deal for me seems to be $160 for three
> 3.5x5.5 boards at 7/7/15.
Si
> I am using the cheapest possible boardhouse for 4 layer.
Who? I've started peeking at 4 layer prototype deals for the second
furnace controller, the best deal for me seems to be $160 for three
3.5x5.5 boards at 7/7/15.
On Fri, May 05, 2006 at 11:45:43PM -0400, Phil Taylor wrote:
> Darrell Harmon <[EMAIL PROTECTED]> wrote:
>
> > I went with 1 via every mm. So far, I have 2110 vias, so I should be able
> > to stay under 2500 by the time I finish routing it.
>
> Can you plate the edges and save drilling 2k holes?
Darrell Harmon <[EMAIL PROTECTED]> wrote:
> I went with 1 via every mm. So far, I have 2110 vias, so I should be able
> to stay under 2500 by the time I finish routing it.
Can you plate the edges and save drilling 2k holes? (assuming the holes are
on the perimeter of your board).
phil
On Sat, May 06, 2006 at 02:32:39AM -0400, Dan McMahill wrote:
> sweet! I can't wait to see it. Does this interface with your SBC?
It uses a board based on the new Blackfin DSP with Ethernet. It is
similar to my DSPcard project except it has Ethernet and no USB.
> I'm
> curious as to what sor
On Friday 05 May 2006 16:09, Marc Price wrote:
> Seen as the Tesla coil mailing list is down i thought i might
> ask this question here
>
> i tested 2 x 2n3055 transistors and i read that you need to
> match the 2 but what
> i dont know is, do i need to have them exact or just close.
>
> transistor
Darrell Harmon wrote:
> I went with 1 via every mm. So far, I have 2110 vias, so I should be able
> to stay under 2500 by the time I finish routing it.
>
> I created a footprint by drawing the lines and vias on the board, and then
> selecting all the parts of the shield box and creating an element
> "every decent cad product can generate copper pour with hatch stroke fill
"every decent fab house can deal with standard gerber files"
I suspect that the effort required to support non-composite pours is
the same effort required for copper island removal. I.e. lots.
Marc Price wrote:
Seen as the Tesla coil mailing list is down i thought i might ask this
question here
i tested 2 x 2n3055 transistors and i read that you need to match the 2
but what
i dont know is, do i need to have them exact or just close.
transistor 1 gain Hfe = 123
transistor 2 gain Hf
I went with 1 via every mm. So far, I have 2110 vias, so I should be able
to stay under 2500 by the time I finish routing it.
I created a footprint by drawing the lines and vias on the board, and then
selecting all the parts of the shield box and creating an element from it.
It worked fairly well.
Marc,
There's nothing that sez that if you have two txstors that match at 1mA DC
that they'll match (even closely) at 2 amps. hfe is nonlinear with respect to
just about all parameters: Vce, temperature, I, etc.
Can you build a test rig and measure parts at the actual currents, temps, and
volta
Seen as the Tesla coil mailing list is down i thought i might ask this
question here
i tested 2 x 2n3055 transistors and i read that you need to match the 2
but what
i dont know is, do i need to have them exact or just close.
transistor 1 gain Hfe = 123
transistor 2 gain Hfe = 194
Any ideas
The board manufacturer allows up to 2500 vias in a board this size. I
need around 800 for signals, so that should leave me plenty for around
the edge of the shield box. Any ideas on spacing? I have everything
from 500 kHz SMPS noise to a 4 GHz local oscillator.
As a reference point, for 2.4GHz I
On Fri, May 05, 2006 at 12:16:56PM -0400, Dan McMahill wrote:
> Can you create a footprint with some pads that are the right
> width/length for the shield? That way if you move the shield around on
> the board you'll keep all the pieces together.
The board is 160x200 mm and the shield is the sa
On Fri, May 05, 2006 at 12:16:56PM -0400, Dan McMahill wrote:
> Darrell Harmon wrote:
> >What is a good way to expose a ground plane for mounting a shield?
> >I have a board which needs to be very well shielded, and am planning
> >on making a machined aluminum plate with compartments for each
> >s
On Fri, May 05, 2006 at 11:58:38AM -0400, Darrell Harmon wrote:
> What is a good way to expose a ground plane for mounting a shield?
http://ronja.twibright.com/twister2/pcb.php
CL<
> I have a board which needs to be very well shielded, and am planning
> on making a machined aluminum plate with co
Darrell Harmon wrote:
What is a good way to expose a ground plane for mounting a shield?
I have a board which needs to be very well shielded, and am planning
on making a machined aluminum plate with compartments for each
section of the circuit. The board will screw to this instead of
standoffs.
What is a good way to expose a ground plane for mounting a shield?
I have a board which needs to be very well shielded, and am planning
on making a machined aluminum plate with compartments for each
section of the circuit. The board will screw to this instead of
standoffs. What is a good way to cl
On Fri, 2006-05-05 at 07:21 -0700, Paul Kube wrote:
> I made all layer names unique and resubmitted the job to OLIMEX.
>
> Their reply:
>
> "every decent cad product can generate copper pour with hatch stroke fill
> the negative plot is ancient way to make copper ground back in the ages
> when
On Fri, May 05, 2006 at 07:21:28AM -0700, Paul Kube wrote:
> I made all layer names unique and resubmitted the job to OLIMEX.
>
> Their reply:
>
> "every decent cad product can generate copper pour with hatch stroke fill
> the negative plot is ancient way to make copper ground back in the ages
I made all layer names unique and resubmitted the job to OLIMEX.
Their reply:
"every decent cad product can generate copper pour with hatch stroke fill
the negative plot is ancient way to make copper ground back in the ages
when computers had no power to calculate the stroke fill coordinates
21 matches
Mail list logo
