Fred 453 Posted July 10, 2013 Author Share Posted July 10, 2013 I had some better results recently but had another extremely slow etch for this board. Then I dabbed it gently with a sponge during etching and it all started working. I suspect that I exposed and developed the etch resist OK, but then the "dissolved" resist just sat on the surface of the board and prevented etching. Or maybe it was a film of the oily sodium metasilicate developer. A quick dab with the sponge was all that was needed to dislodge it, so maybe bubble or spray etching would have done it too. The board's now been drilled and cut out. I decided to try solder paste stencilling so I'm just waiting for some mylar sheet to turn up so I can cut a stencil. I wasn't going to bother with tinning. I'm expecting at least one iteration of the board and I'm doing it partially to get some practice in on the board production. If it works and I can program it from a Launchpad then I'll add a couple more bits, connect the unused MCU pins, etc. Quote Link to post Share on other sites
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.