Electronics Forum | Tue Aug 14 15:08:32 EDT 2007 | gmoritz
pick/place head won't travel over the LED's, then you won't be able to proceed. I wasn't clear in describing my board layout; It is LEDs on one side and SMT components on the other side. I don't think we can get around the problem of stenciling
Electronics Forum | Fri Aug 24 15:06:11 EDT 2007 | stepheniii
What kind of boards are they? Unless they are very simple boards, you won't be able to just replace every TH component with a SM equivalent. The inherent LCR characteristics of the board will change I think the normal way would be not to change the
Electronics Forum | Sat Sep 15 13:00:44 EDT 2007 | slthomas
220 should be plenty although if they're lead free you might need a little more heat. Is it possible that you've got a paste volume issue (stencil design, clogged apertures), or maybe the footprint isn't right for the part? I had this same problem
Electronics Forum | Thu Dec 06 11:19:34 EST 2007 | samir
AMEN TO THAT! The only problem is...what's left of U.S. Electronics Manufacturing is Contract, and as most of us in the CM world can attest to, our customers violate DFX guidelines left-and-right. I agree, also, that the PCB layout guy who also kno
Electronics Forum | Mon Jan 14 02:22:51 EST 2008 | ilona
David, why not contact the current suppliers of selective soldering systems for a copy of their layout specs? Surely we all would be interested to provide potential customers with the info they need to evaluate a process applicabilty or to design bo
Electronics Forum | Sun Jan 20 00:16:39 EST 2008 | mika
Thanks Josh, But I have a question: How about when we are talking double sided PCBA:s? The designer/layouter will see the PCBA straight trough and the mirror flip will cause the "shape" to be 180 degree Horizontally. Now that is not a real problem, a
Electronics Forum | Sun Feb 24 10:15:41 EST 2008 | teamcanada
Issue cross talk \Stencil thickness recommendation? 3-4-5 mil Using manufactures recommended paste layout Water soluable vs No clean Paste. Any recommended publications? Only one found so far is Fairchild, recommend NC due to potential cleaning issue
Electronics Forum | Thu Nov 13 22:20:48 EST 2008 | davef
For your pad layout and spacing between components, look here: http://portal.ipc.org/Purchase/ProductDetail.aspx?Product_code=77b562c1-b8f8-db11-8a6a-005056875b22 For your standoff height in SMT, we do not concern ourselves with standoff height. It
Electronics Forum | Fri Nov 21 18:28:42 EST 2008 | Frank
In the good old days, I've made raw boards at home. Layout the design and then transfer it to a bare copper clad board. Etching it out is the fun part. I grabbed our 9x13 pyrex baking dish from the kitchen. Using metal etching dish doesn't make
Electronics Forum | Tue Dec 09 14:17:13 EST 2008 | dphilbrick
We exclusively use a printer to do glue these days but keep in mind there are times when glue and paste work best. Things like poor layout (ie shadowing) or tall parts that may shadow themselves or a wave solder machine that is not particularly good
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