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<
