Applied Science video on SLA printed circuits: https://www.youtube.com/watch?v=Z228xymQYho
Favorite copper plating bath recipe:
Heat 250ml deionized water to 60*C in a 300ml beaker, stirring at 350 RPM
Add 2.5g CuSO4*5H2O, wait until dissolved Add 4.6g EDTA disodium dihydrate, wait until dissolved
Add 0.84ml of 1% Triton-X 100 solution in water Dissolve 5.8g NaOH in 30ml DI water, stir until clear, then add to bath Add 4ml Formaldehyde (37% HCHO)
Lower stirring to 100 RPM and begin filtration with 0.5 micron syringe filter and peristaltic pump.
No intentional oxygenation or bubbling.
Filter return is below surface for minimal splashing.
I experimented a little with PEG and 2 2' Bipyridine, but didn't find them impactful enough to discuss in this video.
LED rectenna designs: https://josepheoff.github.io/posts/1-hatband https://www.nrl.navy.mil/STEM/LEctenna-Challenge/
Electroless copper references: https://www.nmfrc.org/pdf/p0295g.pdf
Copper chromite catalyst: https://www.sigmaaldrich.com/US/en/product/aldrich/209317 Possibly available here: https://www.kremer-pigmente.com/en/shop/pigments/pigments-of-modern-age/spinel-similar-pigments/47420-spinel-black-no-42.html It's been backordered for a month, so I wasn't able to test it.
Open Sauce 2024: https://opensauce.com/Support Applied Science on Patreon: https://www.patreon.com/AppliedScience
Hey! That's pretty cool! You picked one of my projects to demonstrate your PCB manufacturing process.
ReplyDeleteAs small and unknown as my blog is, I'd have never figured anyone would have found it, let alone find that project interesting enough to replicate.
The process is interesting though probably not something I'm likely to pursue - I'm not good with CAD stuff, and generally just eyeball mechanical things and "bash to fit."
Your voltage-adding rectenna is pretty clever! I love finding independent blogs that remind me of the internet from years ago when curation and links mattered. I think that I found your article from a Hackaday post.
DeleteHi Ben, I read about an invention of your where a game controller uses your mouth and pressure plates below your butt. The laser/tongue method particularly intrigued me and I was wondering if that ever found any interest in the quadriplegic community? What I see in that market is usually only the Quad Stick, which uses a joy stick you can manipulate with your lips or chin. Your laser prototype that tracks a tongue is an interesting alternative. However, I worry its exhausting. Need those endurance muscles in my mouth.
ReplyDelete40ktoday, check out https://www.augmental.tech/ They have spent some serious effort refining the idea and doing user testing.
DeleteBen, I have a friend looking to part with a complete older photolithography machine, gathering info now with folks like you in mind. Has the manual, many sealed wafers, accessories but limited knowledge.
ReplyDeleteThe machine is heavy and in a Las Vegas garage. Was previously owned by a physicist, whose book collection is also noteworthy.
I am learning more but wanted to let you know it’s out here in case you might be interested. Going to take pics and determine make, model, name of the past owner, etc, and estimated current value, which is hard to determine without answering many questions, probably.
Would you have an interest in such a thing if it was transport cost only or low-ball price? Gonna look at it today or tomorrow myself in person.
contract.doug.mayhew@gmail.com
702-788-7909 (Cell)
Hi! Just a note about L-glucose. Apparently, people learned to synthesize it cheaply (see: 10.1016/j.cclet.2014.06.007 ).
ReplyDeleteUnfortunately, it turned out to be a really good laxative. So much that it might be useful for things like colonoscopy prep (see patent US5219573A).