TIL a liquid metal ion source (LMIS) can be converted into a field emission electron source: rapidly turn off an operating ion source to freeze the Taylor cone into a solid pointy tip and reverse polarity of high voltage. https://doi.org/10.1116/1.584459
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isabel
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@vesen@chaos.social
@vesen@chaos.social power supply for the electron source for a transmission electron microscope!
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@sen@hachyderm.io
@sen@hachyderm.io that’s so accurate haha I love how components just get bigger, rounder, and shinier as you go to higher voltages
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@whitequark@social.treehouse.systems
@whitequark@social.treehouse.systems this one gets ~.6 Å resolution :3
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@0x09@hachyderm.io
@0x09@hachyderm.io interesting theory, that is indeed the orientation that the board operates in! airflow over that area of the board is pretty poor in general because of a big bundle of cables
There were 4 parallel 22 Ω current limiting resistors here. The resistance across them was 5.5 Ω, exactly what you’d expect from 4 22 Ω resistors in parallel, and each individually measures 22 Ω. None of the resistors have visible thermal damage. Charring on the PCB makes it pretty obvious that one resistor in particular was overheating - but why not all 4??
@hackerfriendly@mas.to giant spaghetti pile of tubes is just out of frame. But spaghetti on the wall > spaghetti on the floor!