IndrekR
Joined 11 years ago
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1,961
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438
Member since
Mar 27
Recent submissions
Comment · 1 month ago
It is not really just a kettle. Has integrated tea strainer, you can use it as a teapot.
It is missing a proper tea cosy, however.
Comment · 1 month ago
> with visualization on Linux
You mean ‘virtualization’ here, I guess.
Comment · 1 month ago
Major confusion for me, as SPICE is well known circuit simulator:
https://en.wikipedia.org/wiki/SPICE
Using it often. Mostly via ngspice nowadays: https://en.wikipedia.org/wiki/Ngspice
Comment · 2 months ago
Has been done for decades. Buried capacitance materials like FaradFlex MC12TM exist and are really good, but are not too often used.
Comment · 2 months ago
The (more common) package has very precise solder bumps. You can have a special order for one with ENIG finish as well, but this only makes sense if you have a really good use case (using Pb solder, wirebonding directly). Not sure what method is used to deposit this solder. Probably just stencil on wafer before slicing.
Comment · 2 months ago
Length of this capacitor is close to half-wavelength of 220 GHz (in vacuum).
Using siblings of this broadband capacitor (40 GHz, same package) in some designs. In assembly, those require decent process control. This 0201M package is closer to 01005 passives in pad size. Typically no solder paste is used, just flux. Solder mask alignment has to be very tight (thin web used as a dam only).
Cost per cap is reasonable where it is actually needed, other parts of the system are often orders of magnitude more expensive at those frequencies where performance matters. Where it gets the very high performance, is pillars/channels etched into silicon quite similar to how DRAM capacitors are made, just a “little bit bigger”. This allows for very low inductance and thus very high resonant frequency.
Comment · 2 months ago
One scanner has way more than one channel…
Comment · 3 months ago
0.018 kilotons. Order of magnitude smaller at minimum.
Comment · 5 months ago
Jobs would have been lost with that move...
Comment · 6 months ago
Was discussed recently:
https://news.ycombinator.com/item?id=47834195
Comment · 6 months ago
Have you tried Affinity Photo?
Comment · 7 months ago
2/156 lost for Soyuz in 59 years, 2/135 for Space Shuttle in 30 years. Same rate. People often underestimate how intense STS actually was.
Comment · 8 months ago
In QC, keeping cold is not just needed to superconduct, but to reduce thermal noise to level below the energy levels operated at.
Comment · 9 months ago
I am using Leo Bodnar’s fast pulse generator (SMA) in my lectures to teach transmission lines. With sufficient length (I use ~1m) it works quite well to demo with a low cost scope. I originally bought it for TDR with 40GSPS/15GHz scope, which works very well with few orders of magnitude smaller lengths. Old on has upper length limit with 10MHz fixed frequency. There is a new one available with external sync and variable frequency, but I have not bought/tested it.
Am open for good chat on topics that matter in life and elsewhere.