51–60 of 136 posts
Earlier quoted context omitted.
He must have tolerant parents to allow experiments involving baths of HF and Piranha solution in their garage! Seriously impressive though.
Or ignorant parents.
Once space exploration really gets going, mobile chip fabrication is gonna be a pretty big deal.
Please don't dump your solvent down the drain like every Silicon Valley fab did back in the day, poisoning the entire region for decades to come. Just look up how many EPA Superfund sites are in the South Bay due to trichloroethylene, TCE contamination. Dispose of it properly and safely.
> Dispose of it properly and safely. I see a lot of people say this, but I rarely see any actionable advice. How does your average residential person find and dispose of chemicals like this? Seems like most people end up pouring them down the drain simply because they don't know how to actually find a better means of disposing them.
If you have industrial quantities of chemicals (more than a gallon or so), you need to call the relevant entities.
If you are lucky enough to have a hazardous waste disposal locally, obviously use that.
If you have stuff that doesn't break down well in water (cooking grease, for example), pouring that down the drain is always a recipe for trouble. You're simply going to clog your pipes. You need to dispose of that properly. There is a reason why restaurants have grease traps. Normally, residential quantities of this stuff can be placed in normal trash.
You can try to dispose of motor oil at gas stations, service stations, etc., but a lot of places won't take oil from end consumers anymore as it may be contaminated and their recycler will charge them. I actually had a very difficult time disposing of motor oil about 15 years ago. (I don't do my own oil changes anymore for this reason). I got told by the local enforcement "At the end of the day, dishwashing liquid and pour it down the toilet and the sewage treatment plant will chew it up the rest of the way." Obviously if everybody does this, it's a problem, but if it's really a one-off, it's okay-ish.
If, however, your stuff is soluble in water and you have a relatively small amount of it and your waste goes to a sewage treatment plant, pouring it down the drain while diluting it with a lot of water is often your only choice (be careful--solvents and acids can produce fairly noxious vapors even when diluted heavily) Quite often industrial disposal sites simply will not take small quantities of waste from individuals as there are liability issues involved.
Now, you may not like what even a dilute solution does to your plumbing, but that's a different issue. If your sewage doesn't go to a sewage treatment plant, but instead goes to something like a septic system, then you probably don't want to do this.
DO NOT POUR STUFF DOWN STORM DRAINS. Those normally do NOT go to sewage treatment plants (there are exceptions--but they are rare) and, as such, are a really quick way to contaminate the environment.
What happens to old fab tech? A few years ago I tried searching around online to see if there was anywhere you could buy decommissioned machinery for fabricating NAND flash, but I couldn't find anything or any sign that such things ever really come up for sale. Has anyone worked in a fab or otherwise have some idea of what happens to the stuff that worked at larger process sizes?
A lot of the stuff, e.g. 193i immersion litho, gets reused the by the fabs, other stuff gets used for older nodes, which are often still thriving, e.g. 180nm is popping for analog.
This is all very interesting and amazing, and kudos to the person for being able to do this - but I think we need to take a step back here a bit; this doesn't look like something that "just anybody" could replicate. For one, this person seems to have some very advanced knowledge of some very advanced processes - I am not even sure where one would gain such knowledge from easily, though they do seem to have access to…
This is all very interesting and amazing, and kudos to the person for being able to do this - but I think we need to take a step back here a bit; this doesn't look like something that "just anybody" could replicate. For one, this person seems to have some very advanced knowledge of some very advanced processes - I am not even sure where one would gain such knowledge from easily, though they do seem to have access to…
You're overhyping the knowledge a bit. It can't have been gathered over that great a span of time because he was only in his late teens when he did this. Also I've been able to work out most of it myself over a period of about a year using the book "Introduction to Semiconductor Manufacturing Technology" by Hong Xiao for general process layout (what steps are necessary, in what order, with what chemicals, etc.) and a…
Please don't dump your solvent down the drain like every Silicon Valley fab did back in the day, poisoning the entire region for decades to come. Just look up how many EPA Superfund sites are in the South Bay due to trichloroethylene, TCE contamination. Dispose of it properly and safely.
> Please don't dump your solvent down the drain like every Silicon Valley fab did back in the day, poisoning the entire region for decades to come. +1 Please develop a workable waste disposal strategy BEFORE thinking about cool disruptive home brew nanofab MEMS/circuit hacks.
Earlier quoted context omitted.
> Is this specific to photography at this scale? Yes. A smaller scale makes it worse, a larger scale makes it better. If you reduce things enough, everything will become so blurred that you won't be able to see anything (that's why we can't photograph atoms using visible light), and if you make things large enough your camera will become the bottleneck so a very small amount of blur is added to any object, whatever t…
Ah I see, when you say "photo" you are referring to the photolithography used in the chip making and not the captured photo of the finished chip is that correct?
Earlier quoted context omitted.
That is very interesting! I watched that and found some more information after searching a little: [1] https://www.yokogawa.com/yjp/solutions/solutions/minimal-fab... It seems like this fab is a demonstrator, and is planned for sale. This makes me wonder if/when this will be available for maker style setups, at which process nodes & price per piece. Would be nice to be able to design some fully custom ip, have it tes…
Found another, more technical video, but couldn't recognize anything about process node/feature size. Anyways, here it is: [1] https://www.youtube.com/watch?v=hViCDab0E2A
[1] https://asia.nikkei.com/Business/Biotechnology/Minimal-fab-t...
According to wikipedia the following CPUs were built with that:
[2] https://en.wikipedia.org/wiki/350_nanometer
Which i think of as more than sufficient to finally being able to implement something like SCED, WAM, CHERI, Applecore, whatever in whichever way one is able to wrap his brains around it. Asynchronous, fully static?
https://en.wikipedia.org/wiki/Mead_%26_Conway_revolution (with MEMS(for sensing)) from scratch?
I want it all! I want it NOW!
Please don't dump your solvent down the drain like every Silicon Valley fab did back in the day, poisoning the entire region for decades to come. Just look up how many EPA Superfund sites are in the South Bay due to trichloroethylene, TCE contamination. Dispose of it properly and safely.