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Homebrew PCBs

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Message

who does SMD ?

2007-04-09 by Adam Seychell

I'm wondering what other people are doing out there for PCB that use 
SMD. I finding over the years my PCBs need smaller and smaller tracks to 
suit the ever shrinking SMD packages. Well, we know BGA is out, because 
that needs a multilayer board. Luckily, only the really big chips are 
BGA. These days 0603 chip resistors/caps are the norm. Often I need to 
run a trace under a 0603, or my latest project has two 0.5mm pitch TQFP 
(leaded) and QFN (leadless) packages. I'm wondering how other people 
deal with PCBs for SMD.

I use photomasks from a inkjet printer. Recently I bought a Canon MP810, 
and noticed the resolution and line edge sharpness was a noticeable 
improvement over my old printers (Epson Stylus 660, Canon i550). Its 
definitely true 1200x1200 dpi resolution. Using "3M Universal 
Transparency" film, and printing with the driver set to "Photo Paper 
Pro", "Quality 1" and Cannon OEM inks, I can just get away with 
0.008"(0.20mm) lines/spacings. 18um foil instead 36um makes etching fine 
traces a lot better.

Adam

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