I've been doing some baking, although the wife wasn't impressed that the results were inedible.
- 10 boards, just need the RCA and Dsub connectors.
- NearlyThere.jpg (229.52 KiB) Viewed 33241 times
Some pictures of how I did it.
- Jig for the stencil made up of old pcbs taped down so board to be stenciled is held securely.
- StencilJig.jpg (105.51 KiB) Viewed 33241 times
- Close-up of paste applied to board.
- SolderPaste.jpg (82.37 KiB) Viewed 33241 times
- Ready to go into the reflow oven.
- PartsPlaced.jpg (114.88 KiB) Viewed 33233 times
- My hacked Aldi toaster oven with PID controller off of ebay. Temperature set to 250C, takes nearly 4 minutes to reflow a board. I did them one at a time.
- Oven.jpg (127.33 KiB) Viewed 33241 times
- SMT parts reflowed. The parts self align once the solder becomes molten, however I did have one cap so far off the pad it jumped to the next pad. Also got solder bridges on 3 of the 6802 chips, probably caused by poor placement and smearing the paste too much, easily reworked though.
- Reflowed.jpg (110.51 KiB) Viewed 33241 times
So there you have it. I've ordered the connectors I need to finish the boards. Well that would nearly finish the boards, except for a small goof I made. In Kicad when you run a design rules check in pcbnew, the results are shown in 2 tabs. The first tab shows clearence problems, tracks to close to pins, etc. I got those sorted out, but didn't realize I needed to click on the second tab that shows unconnected pins. I had accidentally deleted 2 vias the connect the 6802 earth pins to cell 1 negative.
So each board needs 2 small holes drilled and the pins connected to the ground plane. Not enough of a problem to warrant new boards for testing. I'll fix the problem and tidy up the silk screen layer some more, as long as I lock the smt components I can use the same stencil.
EDIT: Added PartsPlaced.jpg