Re:Chiptunes on an ATtiny4 and the 3 Cent Micro
by Teknoman117 on Tuesday May 04, 2021 @04:46PM
(#27042677)
I just ordered some boards where I used a lot of 0603 (1608 metric) passives, first time doing something quite this small. I did use the "hand solder" version of the footprints in KiCad. Tiniest things I've done by hand are some TSOT-23-6 packages and a 386EX33 in that annoying PQFP-132 package (the millipede).
Want to try using a flat tip I use for QFPs, but if it's too difficult, I'll get some solder paste and use my hot air station (which I initially bought to de-solder some seriously annoying DIPs (DS1687+ in EDIP) on some old SBCs - the solder just would not come out with solder wick or a pump).
I'm basically imagining tweezers and holding one's breath.
Though hole has... well... holes. It requires tediously placing all your stuff through those holes.
SMD on the other hand, can be solder-pasted and then baked with a $20 skillet + hot air gun to finish off the last bits. The solder has surface tension and naturally "pulls" pieces into place.
SMD is slightly more expensive than a soldering iron: you still need the soldering iron for some bits. And solder paste goes bad over time, and flux to keep stuff clean. You'll also need more expensive PCBs with a solder mask if you want to keep things easiest (but its really not that much more expensive: most costs seem to be shipping costs these days).
So you get your skillet (or toaster oven), a hot air gun, soldering iron, solder wire, solder paste, and finally flux... and you're pretty much set.
Maybe get some "desoldering" pump and "desoldering braid", in case you need to rework some stuff. But the skillet + hot air gun works pretty well.
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Work with larger 0805 resistors/capacitors. They look small at first, but you can probably work at that level even without tweezers. More skilled people can work with 0402 and smaller pieces (though that's entering tweezer-only territory)
If 0805 is too small, there are larger pieces available like 1206. But I personally think 0805 sufficiently large for beginners to work with.
EDIT: I'm talking about American codes. 0805 American is equivalent to 2012 European.