Monday, September 3, 2018

Make plastic printed circuits with a standard laser cutter

I developed a new chemical process to make double-sided PCBs with a laser cutter, and some common chemicals.  This is intended to be used on SLA 3D-printed parts, but may work on many materials.




Refs:
http://infohouse.p2ric.org/ref/29/28004.pdf

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.527.5817&rep=rep1&type=pdf

http://shodhganga.inflibnet.ac.in/bitstream/10603/195088/3/chapter%202.pdf

https://sci-hub.tw/https://doi.org/10.1016/S0167-577X(03)00424-5

https://library.nrao.edu/public/memos/chem/CHEM_5.pdf

https://core.ac.uk/download/pdf/48645791.pdf


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Sunday, August 19, 2018

Vintage electrical tech - Weston Sensitrol Relay

This vintage electrical meter is incredibly sensitive, and latches relay contacts with just 18 nanowatts!

Link to old Weston advertisement from 1950's:  https://pdfs.semanticscholar.org/7efe/c1a814298b121ecf67947183d3630db7f3b0.pdf

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Sunday, August 12, 2018

Engineering magnetics -- practical introduction to BH curve



A practical introduction to understanding magnetic devices such as transformers and motors. This video covers BH curves, reluctance, permeability, DC and AC magnetic circuits, and some applications. 

Please put questions in the comments, and I'll do my best to answer them! I apologize that I didn't mention inductance. 

This video focuses only on the magnetic side of things. Inductance is how the electrical circuit interacts with the magnetics.

Sunday, July 15, 2018

Candle flame is repelled by magnets (and Zeeman follow-up)



Why is a candle flame repelled by magnets? It turns out to be a combination of diamagnetic soot particles and hot gas.

Dr. Faraday on the diamagnetic condition: https://books.google.com/books?id=Shc8boMnrBoC&pg=RA3-PA406&lpg=RA3-PA406#v=onepage&q&f=false

On Flame and Gases: https://books.google.com/books?id=D8NAAAAAcAAJ&pg=PA187&lpg=PA187#v=onepage&q&f=false


I should have mentioned in the video that the exhaust from a flame will be oxygen-poor, thus also making it more diamagnetic than normal air.  Air is a mixture of nitrogen (diamagnetic) and oxygen (paramagnetic). Removing the oxygen will make the resulting gas more diamagnetic.


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Sunday, June 24, 2018