cyanoacry

5 ms·

1.
by cyanoacry 2y ago
Thanks, updated! Please do CC me, as then I can vouch for where you came from :)
2.
by cyanoacry 2y ago
Esperto Medical | https://esperto.health | Los Angeles Area | Hybrid In-office | Senior FPGA/Firmware Engineer We're building a medical device that allows us to measure BP continuously, in real time. (We're a Calt
3.
by cyanoacry 7y ago
Thank you for the write-up! It's a little depressing (but not entirely surprising) to hear that you couldn't get folks excited about safety -- I work in the aerospace field, and our day-to-day is all about risk management: how, wh
4.
by cyanoacry 7y ago
Nice article! I used to work in this space (was formerly in charge of GNSS hardware at my company), and it's neat to see Galileo being put through its paces. I see now that the US gets to take GPS (and the fact that the Air Force prett
5.
by cyanoacry 7y ago
There are several I'm on (canard-aviators and gns480-users), and they've been active for something close to a decade. (And there are still emails every day!) Frustratingly, both of these groups have great content (manuals, tips, d
6.
by cyanoacry 7y ago
Neat work! Question from someone who's familiar with RF atomic clocks but not optical -- how do you steer a laser in frequency? For RF, it all comes down to VCOs: if you want a different tune range or different frequency, you just pick
7.
by cyanoacry 7y ago
Maybe! I've worked with some SiC FETs, but the issue I ran into with FETs in amplifiers is that they're typically made with switching in mind. If you run most FETs in linear mode, you get some pretty interesting failure modes[1].
8.
by cyanoacry 7y ago
As someone who's worked on (and drafted!) several schematics in the aerospace industry, I have to say: there's no reason it has to be that way! The places I've worked have pretty rigorous style guides, and I personally try my
9.
by cyanoacry 7y ago
> There is no evidence the heat dissipated will impact lifespan. I have to nitpick at this a little bit as a professional EE who works in high-reliability electronics. Wearout rates absolutely do depend on temperature (and thus heat),
10.
by cyanoacry 7y ago
There are a couple of counter examples, particularly in New Space startups. At 26, I was a Mission Director (SpaceX's equivalent to a NASA Flight Director) for Dragon re-entry and landing. As the old Apollo-generation engineers start t
11.
by cyanoacry 7y ago
And for those that wonder what a more "modern" scratchbuilt plane is like, check out the Cozy Mk IV: https://en.wikipedia.org/wiki/Cozy_MK_IV . Made from fiberglass and foam cut to templates that came with a s
12.
by cyanoacry 8y ago
I highly recommend Nayuki's site: https://www.nayuki.io/ Lots of content (made mostly for themselves), but the writing style is pretty nice and there's a large variety of projects.
13.
Using MEMS barometers as high-resolution tactile sensors (2014)(labs.righthandrobotics.com)
2 points by cyanoacry 8y ago|0 comments
14.
Homebuilt custom-text discharge tube (like a Nixie) (2011)(imajeenyus.com)
2 points by cyanoacry 8y ago|0 comments
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by cyanoacry 8y ago
More relevant information (including the history of the project) from AOPA: https://www.aopa.org/news-and-media/all-news/2016/october/19...
16.
by cyanoacry 8y ago
Neat, it's always really cool to see folks get their feet wet in the DSP field! (Props to the author for trying to get through the dense Wikipedia pages.) Minor correction for the author: this isn't amplitude-shift keying, and the
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The Making of a F-1 Engine Thrust Chamber(heroicrelics.org)
3 points by cyanoacry 9y ago|0 comments
18.
Reference Guide to the International Space Station (PDF, 2015)(nasa.gov)
2 points by cyanoacry 9y ago|0 comments
19.
by cyanoacry 9y ago
1. Rockets 2. Cost of launch locks out potential customers and limits R&D uses. Global launch cadence is slow; getting into orbit is a multi-year adventure. 3. Yes, we're working on reusable rockets. However, this only goes so far.
20.
by cyanoacry 9y ago
John Muratore now works at SpaceX, but this is a pretty good interview with him during his NASA days. There's a particularly enlightening paragraph about how he retooled Houston's mission control using the "pirate paradigm&qu
21.
Interview with John Muratore: Rebuilding Mission Control and Spaceplanes (the X-38)(jsc.nasa.gov)
2 points by cyanoacry 9y ago|1 comments
22.
by cyanoacry 10y ago
You can try adding a parabolic (or circular) reflector: http://www.freeantennas.com/projects/template/ As with the original link, the antenna is directional (and since it's a reflector, probably even more dir
23.
Simple Wi-Fi Yagi (2014)(ham-radio.com)
211 points by cyanoacry 10y ago|67 comments
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by cyanoacry 10y ago
When I was a little kid, I rented out Apollo 13 almost religiously. Kept watching it, admired the guys in mission control (and the astronauts too, of course). A little later, in April, I sat in mission control and helped launch a spaceship
25.
by cyanoacry 10y ago
I've built a fusor[1], and in its simplified form, it's just a large, negatively charged grid in a vacuum chamber with some hydrogen sitting around. Nothing to be afraid of! You're absolutely right that these devices don&#x27
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Semi-invasive attacks – A new approach to hardware security analysis [pdf](cl.cam.ac.uk)
1 points by cyanoacry 11y ago|0 comments
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SpaceX SuperDraco Test Fire(youtube.com)
1 points by cyanoacry 11y ago|0 comments
28.
by cyanoacry 11y ago
Two things: 1) Of course, anecdotes don't prove the general case. 2) There's some conflation here between knowledge of toolchains and knowledge of software. Arguably, they are not the same--they might be orthogonal domains of know
29.
by cyanoacry 11y ago
DSCOVR actually is in a "halo orbit" around L1, which means it's not sitting in the plane of the Earth-Sun orbit. From the DSCOVR site[1]: "The spacecraft will be orbiting [L1] in a six-month orbit with a spacecraft-Eart
30.
by cyanoacry 11y ago
It's mostly a function of how the transistors are made. If a transistor is on by default, they're called "depletion-mode" transistors--this means that the channel between the two sides of the transistors normally conduct

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