That is a fine example of ingenuity there! Soldering the .5mm pitch parts has not been a problem. I just do an inspection of the edges of the part after they are reflowed. I had one part have a solder bridge that I cleared up by running the soldering iron across the edge of the part and draging away. I have a bit extra on the pads that is exposed that allows me to do this.
Thanks! I have a home made hot air toll that I use. It takes a few minutes to heat up but works pretty well. I have also found Chip Quik Fluz to be invaluable. I'm going to try doing some .5mm pitch parts soon. Thanks!.
Sorry for the late response, I have been recovering for a lot of travel. The soldering I do with a hot air rework tool. Because the boards are so small, they reflow almost the entire board at once. It really works pretty well. I am in the process of converting a toaster oven, but I have to get through a few other things first.
On the design rules. OSHPark really can do down to their 6/6 spacing. They can even do smaller, they have margin built in, but do not expect to have 100% yields at a lower spacing.
I've been using OSHpark (previously Dorkbot/Laen PCB) for several years. The price and turn around time is pretty darn good. Being 'down under', affordable fab houses are non existant. I couldn't find anyone who could come close with my design's requirements - 4 layer, 5/5mil track/spaces, 4mil annulars and 10mil holes.
Their prices are unbeatable if you want lots of boards too.
Yeah, I find the small boards a nice challenge. I love trying to fit everything on them that needs to get there. What is your current project that you are doing that is that small? I would love to hear about it.
On the KL02, I am just exploring being able to use it. Once I find a way to do it, then I will find what to do with it ;)
I agree about how much easier board building has gotten. I'd never use some of these quick and dirty techniques when I'm on a strict timeline, but it has really opened up pathways to build quick, 'usually' reliable prototypes.
If you want to play with the KL02 microcontroller, the evaluation board only costs U$12.96 at DigiKey.
The 3x3mm QFN-16 package wouldn't fit on your 0.38"x0.38" board?
Like you, I design very small boards. My current project is only 0.29" x 0.31", and has parts on both sides. It's easy and fun to design these projects, but what a pain to build and test and debug something that tiny!
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