Re: gEDA-user: Cheap 4 layer manufacturer?

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

On Mon, Oct 10, 2005 at 07:34:26AM -0500, Darrell Harmon wrote:
> On Mon, Oct 10, 2005 at 06:39:12AM -0400, Bob Paddock wrote:
> > On Sunday 22 May 2005 03:52 pm, Darrell Harmon wrote:
> > 
> > > I will be using PCB Train (http://pcbtrain.com) for my next board since
> > > the sierra proto express vias would not fit between the pads of a 1mm
> > > pitch BGA.  They have also answered a few of my questions quickly.  They
> > > seem willing to do arrays of boards.  I like this since I am working on
> > > 3 different credit card sized boards and can save money by combining
> > > them.  I will let the list know how this goes.
> > 
> > How did http://pcbtrain.com  work out for you?  I'm looking for someplace that 
> > can do four layer boards, with out breaking my budget.
> 
> I started with the idea of using PCBtrain, and while the via size is
> nice, the clearances they want on the inner copper is unusable. You
> basically lose your entire ground plane under the BGA to vias.
> 
> There is a PDF file on my website of the layout I ended up with.
> http://dlharmon.com/dspcard/dspcard-art.pdf
> 
> I use http://www.protoexpress.com currently. With the no touch service,
> you get 2 of any 4 layer board under 8x10 inches for $137 shipped. I
> bumped the ball size down from the Xilinx recomended 0.4mm to 0.34mm,
> and everything worked out fine. I will be putting the ball size back
> to 0.4mm and using smaller vias for production. I am getting prices
> of about $500-800 for 100 boards with 10 mil vias and 6mil track/space.
> The board is about the size of a credit card.
> 
> Let me know if you have any questions.

Are you going to mass produce them and sell?

CL<