Great responses. Thanks to all. As I said, I will order greater quantities from a commercial PCB maker. I have no intention of making hundreds of them at home. The home made boards, ONE, TWO, or at most THREE, would be ONLY to verify the PCB layout. With that in mind, I would HAVE to make those few, home brew boards DIRECTLY from the layout that I create in a PCB design program. Otherwise, it is still prone to mistakes and therefore useless. Vias are a problem, but my circuit is simple so this may not be overly difficult. First, I can probably solder some wires in vias that are under the chips. Just use a close cutting pliers to trim them as flat as possible. The specs for a -DW Plastic Small Outline package, which I intend to use, show a 0.004" to 0.012" clearance between the bottom of the package and the board. The copper thickness will add a bit more to this. I would verify the connection(s) before installing the chip. A little extra bending on the chip leads will create a bit more space for them. Tedious, but possible. And this is ONLY to verify the design. Sounds like toner transfer may be the way to go. I could always get laser/Zerox style copies made at a local service. I have the ability to drill it, no problem there.
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Re: Selecting Method For Prototype Boards
2014-07-21 by Paul Alciatore
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