jmwilson

12 ms·

61.
by jmwilson 6y ago
> I don't quite follow. I think you just mean reactance at higher frequencies (since resistance is DC), and total impedance is then DCR + frequency-dependent reactance. No, he's correct. Ferrites are a specifically-designed los
62.
by jmwilson 6y ago
> Hasn't that problem mostly been solved already with switch mode power supplies that are pretty small. Perhaps you are thinking of "wall wart" power supplies that used line-frequency transformers in their rectifier design
63.
by jmwilson 6y ago
What are your expectations and applications for color in an e-ink writable tablet? The best available color e-ink displays support a spot color palette of 3-7 colors. They're nowhere near being able to show a full-color image. If you w
64.
by jmwilson 6y ago
Technical details are described here: https://gitlab.com/jjwiseman/advisory-circular/ Things flying near an airport are excluded ("The centroid of the last 3 minutes worth of positions must be more than 2.5 k
65.
by jmwilson 6y ago
Of course they could do that, but any corporation or LLC that does business in California [1] (surely a Uber driver operating in California would be considered as such) has to pay the fee. Incorporating out of state would just mean a second
66.
by jmwilson 6y ago
There's the $800 California LLC annual fee, which is the highest in the country, and applies before you make a dollar in revenue.
67.
by jmwilson 6y ago
The author didn't say anything about "interesting" vs. "boring" companies or ideas. He said YC should curtail funding of dev tools/SaaS startups, because the traction they appear to have is misleading. They&#x2
68.
by jmwilson 6y ago
The Federal criminal law analogue of 42 USC 1983 is 18 USC 242 ("deprivation of rights under color of law"). It probably doesn't surprise anyone to hear that referrals to prosecute under 242 have steadily declined over the ye
69.
by jmwilson 6y ago
It's a Fritzing diagram, which is to say it's a schematic, not a layout. So the thickness of lines should not be taken as indicative of any physical properties like connector style, wire gauge, or insulation. Clearance and creepag
70.
by jmwilson 6y ago
That's not a helpful way of looking at things since individuals do not trade the average strategy. They trade whatever theory they are seeking to validate, which is too often "their gut" or the latest technical analysis woo.
71.
by jmwilson 6y ago
There are twitter bot accounts that post live when they detect aircraft flying in circles: @SkyCirclesSF @SkyCirclesLA @SkyCirclesDC
72.
by jmwilson 6y ago
From the github repo, the site is a wrapper around exactly two shell commands. Instead of uploading your data to an untrusted site, you can run from the comfort and safety of your local computer: convert -density 150 input.pdf -colorspa
73.
by jmwilson 6y ago
Sure, the voltage divider works ... if the load impedance is high. Not a good idea for a 50 Ω load. Op amp needs a dual-rail power supply, so it needs some auxiliary power, then power electronics to get both rails. Stuff starts to get compl
74.
by jmwilson 7y ago
Resolution in the frequency domain can be significantly improved over the natural resolution of the DFT (19 Hz in your case). If the fundamental frequency exactly matches one of the DFT bin frequencies, it would mean the frame size is an ex
75.
by jmwilson 7y ago
> I would argue that financial math by definition needs to be accurate to the penny. Where is "pretty close" financial calculations considered acceptable? There is a difference between analysis and accounting. There are many fi
76.
by jmwilson 7y ago
There's certainly no place else like it. What some of the previous reportage ("What $50 buys you in Huaqiangbei") misses about what makes the place unique, is it's less about what you can buy there, and more about what y
77.
by jmwilson 7y ago
The FDA's mandate is to ensure safe and effective therapies, not high customer satisfaction.
78.
by jmwilson 7y ago
High temperature turns the fibers from irritants into carcinogens like asbestos. Well, high temperature in this case being above 1800 F/1000 C, over 4 times the operating temperature of these ovens.
79.
by jmwilson 7y ago
> Encryption isn't actually necessary for any of the stated purposes of amateur radio (experimentation, recreation, training, contesting, emergency comms, etc) It is, or will be, needed for experimentation. Wireless security cannot
80.
by jmwilson 7y ago
The times I have used CAS to help with algebraic simplification, I've found the same problem, regardless of using SymPy or the more feature-filled Mathematica: the package's rules for simplification often obscure useful forms that
81.
by jmwilson 7y ago
In the case of Louisiana, I'm guessing the Cajun and Creole areas were never wealthy compared to the cities. Young people from the country seeking jobs and money in urban centers has been a theme throughout the 20th century, and geogra
82.
by jmwilson 8y ago
As someone who bought a license to Circuit Studio (the $500 version), I can't recommend it. Missing some of the higher-end features is being polite; while there is no agreement on what is high-end, I found that many general-use feature
83.
by jmwilson 8y ago
Second the recommendation for Snips. I recently built a Snips-based voice assistant for hands-free oscilloscope control ( https://github.com/jmwilson/ollie ), and snips is a much better fit for this kind of domain-specif
84.
by jmwilson 8y ago
Pretty easy, I had no background in voice assistants before. You set up the intents on their console site, rack your brain for every way you could phrase a command, and then press a button and Snips will let you download the trained assista
85.
Show HN: DIY Oscilloscope Voice Control(github.com)
3 points by jmwilson 8y ago|2 comments
86.
by jmwilson 8y ago
Can you share publicly any of the projects & maintainers you're currently working with?
87.
by jmwilson 8y ago
Their own legibility study shows it's about around the same as Verdana: https://i.imgur.com/M0C3TkY.png (excerpt from the PDF in the download .zip, vertical axis is misidentifications). Their design goal was beating th
88.
by jmwilson 8y ago
The amount of data it collects and files hopefully makes it harder to dismiss. It is using the same ADS-B data as flightradar and similar sites, so it's able to report detailed information- exact time, what aircraft passed overhead, ho
89.
by jmwilson 8y ago
At midday on a sunny day, by the sunny-16 rule you can expect to set the camera exposure to f/16 1/100 s at ISO 100. To get to even 1/50 s, you're now at f/22, the limit of most commercial lenses. So yes, ND filters
90.
When the H-1B Transfer Denials Crisis Hits Home(people.ai)
18 points by jmwilson 8y ago|4 comments

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