Quote:
Originally Posted by bandersen
Yes, except that I made these using a different technique. Before I used perf board - this time I tacked them together in free space.
I've worked with small parts for years and my eyes are still god enough so I found this fairly easy.
The couplates that look like a bunch of vertical tubes are really made up of carbon comp and ceramic caps. I've measured a bunch and the resistors are have typically drifted high.
The flat, thin couplates like at the top of my photo are made using material deposited on a ceramic substrate and measure more closely to the specs. So I suggest leaving those alone unless you know for sure they're bad.
As for SMD, I've seen various techniques used. The most basic is to dispense the solder paste with a syringe, place components with tweezers and "bake" the board to melt the solder paste.
More recently, I've seen board vendors supply a laser cut sheet metal mask so you can squeegee all the solder paste on at once. Like silk screening.
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Yes, typically when boards are manufactured they use the silk screening technique and solder all the parts at once. You can do it by hand one at a time by placing a small blob of solder on one pad first, then re-melt the solder while placing the part. After that you solder down the other terminal(s).