nunuvit

20 ms·

211.
by nunuvit 3y ago
I don't understand this comment.
212.
by nunuvit 3y ago
While that does sort of happen, that's not the reason. Article says it was used in satellite links and deep space networks before it was cool. Those applications had hit their technological limits and no one was making something new th
213.
by nunuvit 3y ago
As with any research, there are many possible audiences and it's not an article targeted at you. It's your job to already be educated in a way that's relevant to yourself. The link I posted shows that the research has pretty
214.
by nunuvit 3y ago
Replying to my own comment to explain how it directly relates to the asked question - what to do with empirical research? The key takeaway is to evaluate everything in terms of sensitivity because it gives you design insight. The above quot
215.
by nunuvit 3y ago
Cool. Be safe, don't play with SiC or IGBTs, the high voltage will kill you. GaN will be more mainstream in a few years, Infineon just bought GaN Systems.
216.
by nunuvit 3y ago
One of the most important lessons I've learned in my career is that if a common problem has existed for a long time, a simple solution has probably been hiding in plain sight for a long time somewhere you haven't thought to look.
217.
by nunuvit 3y ago
Haha SiC and IGBTs are hardly esoteric. If anything, GaN is esoteric. You just wouldn't know it because industrial doesn't get the same press as computer power supplies.
218.
by nunuvit 3y ago
> my R&D engineer works three shifts and you only work one shift > All RnD fabs move wafers 24/7 Are you talking about the same thing? It's one thing to let an experiment run overnight with three technician shifts. It&#x
219.
by nunuvit 3y ago
Manufacturing equipment isn't plug-and-play like an office laser printer. It's more like a paint brush and you're responsible for the results. It seems they spend more time learning how to get the most out of their tools.
220.
by nunuvit 3y ago
Yeah but there's a huge difference between fully loaded in earth's gravity and (a smaller stage) partially empty in less gravity.
221.
by nunuvit 3y ago
Speaking of methodology, it's incorrect to relate a development test result to reliability or risk. Source is my personal experience doing reliability calculations for a NASA rocket component and working with the statisticians incorpor
222.
by nunuvit 3y ago
What are penetration hockey sticks?
223.
by nunuvit 3y ago
I don't think you realize this, but when you said that we can't exclude the test failure from the risk/reliability assessment, that's exactly what you're saying. I didn't realize until just now that you're
224.
by nunuvit 4y ago
You have it mixed up. I've worked with the stats at NASA. Mission success and failure counts. Test quantity and quality count, test freedom counts, how they learn from test counts, but the test result does not count. This isn't a
225.
by nunuvit 4y ago
Haha I had a feeling someone would bring this up. To me, old space isn't farther back in time in the golden age of space, but rather what the space industry eventually calcified into. New space is like a Renaissance. There are other ne
226.
by nunuvit 4y ago
At this level, we're creating the concept of a digital state, so we can't use that result to solve problems, it's circular reasoning. If damping makes heat, how can damping it enough make less heat? Why are you assuming that
227.
by nunuvit 4y ago
You're describing magic and contradicting yourself. Tri-state means everything is off, so one transistor can't also be on at the same time. Damping dissipates heat, so damping by controlling the output transistor requires a bigger
228.
by nunuvit 4y ago
I guess I'm not sure what point you're making. If you consider a test flight failure to be part of the overall failure rate, then you're treating it the same as a "real" flight. The government is constrained to less
229.
by nunuvit 4y ago
This isn't a production flight so why are you treating it at one? What if I told you that you can't compile your code until you deploy it for the first time and you don't get to change it much after that? I'll leave you
230.
by nunuvit 4y ago
Completely agree. I've worked in "old space" and the fundamental problem is that they can't afford to experiment. SpaceX has the option to physically test an idea that's holding them up before investing in fully bri
231.
by nunuvit 4y ago
It depends on the design, but think of it this way. Digital if the smallest you can go. The protection circuit is not strictly digital, therefore it is bigger. It's not already handled because you still need a circuit that detects the
232.
by nunuvit 4y ago
Turning off the transistor is only the last step and the previous steps like detection take up space. Digital CMOS is bi-state and the pin is tri-state, therefore you can conclude that there are additional components involved to achieve the
233.
by nunuvit 4y ago
The current limiter is analog and dissipates a lot of heat compared to digital and also uses more passive devices, so it must be bigger. Digital CMOS is triggered to switch between fully on and fully off. You can't really hold it in be
234.
by nunuvit 4y ago
This is a layer below the digital circuit abstraction in the territory of analog circuits and device physics. The extra current is a physical thing and you need more material to temporarily withstand it, and more circuit to detect and contr
235.
by nunuvit 4y ago
My sliding keyboard phone used to disassemble itself whenever I dropped it, which had the unintended benefit of being self-cleaning.
236.
by nunuvit 4y ago
All test equipment has reduced performance near its limits. I probably should have just said range because it's implied.
237.
by nunuvit 4y ago
I assume you don't actually need all of the transmission line s-parameters at low frequency. In which case, you can use a frequency response analyzer (FRA), of which there are a few in production. The gain and phase measurements are en
238.
by nunuvit 4y ago
You're mincing words. Think of the idea as being the formulation and you'll find agreement between the statement and your example. Edit: That is to say, I think you agree in principle, and you're finding points of disagreemen
239.
by nunuvit 4y ago
I was a paid rec sports referee at 13 for the younger kids league, and I worked unpaid for the family business before that. There's no way I could have, or should have, done that full-time. A few hours on the weekends or the odd weekni
240.
by nunuvit 4y ago
Here's a good article explaining in-depth how and why LED light looks different from incandescent. https://nymag.com/strategist/article/led-light-bulbs-investi...

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