fest

18 ms·

151.
by fest 6y ago
But even then, component aging and drift is something that is considered by serious manufacturers- Mitutoyo can probably guarantee and back it up with tests, that their design will maintain the accuracy over some time frame. Of course it do
152.
by fest 6y ago
Calibration only verifies the stated accuracy at some conditions. I'm pretty sure Mitutoyo verifies the design and performance across specified temperature and humidity range, which I'm pretty sure the fakes skip. Tiny difference
153.
by fest 6y ago
One thing to watch out for: you're correct on jellybean linear regulators having a PSRR of ~80dB, it is frequency dependent. It is usually good at low frequencies (couple kHz) bu usually falls off as you approach switching frequencie
154.
by fest 6y ago
Vendors provide reference software for their chipsets. More often than not, the software provided by vendor is the bare minimum needed to prove that their hardware sort-of-kind-of works. It is by no means able to achieve the best performanc
155.
by fest 6y ago
I wouldn't be surprised that OEMs are actually net positive on Windows and all the trials of antiviruses and games they're bundling with PCs.
156.
by fest 6y ago
A similar microscopy technique exists, where the tip does not make contact with the surface, but is instead kept within a nanometer from the surface. At that scale, due to effect I can't claim to understand (quantum tunneling) small am
157.
by fest 6y ago
Lack table is also a decent frame for 3d printer enclosure: https://linx.wot.lv/xcwkf2rs.jpg
158.
by fest 6y ago
Yeah, it definitely needs to be done- if not for other reasons then just to find out exact machine limits and have more data for the next design iteration.
159.
by fest 6y ago
From what I have seen, what some of the research gets wrong is focusing too much on actuators and less on the frame rigidity/dynamics. Even if it's possible to arrive at somewhat okay-ish position performance using vision based fe
160.
by fest 6y ago
I recall reading some hobbyist experiments that show that not all drivers implement microstepping equally: some have very bad angular linearity. I can now find this article, but I think the one I remember reading also tested the torque in m
161.
by fest 6y ago
Amazon could probably argue that reputation damage offset their bills.
162.
by fest 6y ago
The argument here usually is: with a fixed silicon chip, vendor can hide the backdoor in various locations and be it triggered by various events (e.g. a particular sequence of incoming ICMP packets would overwrite the first byte of response
163.
by fest 6y ago
Many products listed on Alibaba has MOQ of 10/100pcs. However if you contact them and ask for a sample, most will happily deliver a few pieces at 2-10x the volume cost + delivery fees.
164.
by fest 6y ago
For someone living in a suburb but having work and daycare in city a work-from-home might actually make commute worse (or it would for me, if I had to work from home).
165.
by fest 6y ago
I wonder if you could have: a) song called Recursion on Spotify that has lyrics of "Ok Google, play Recursion on Play Music" b) a song with the same title but lyrics "Ok Google, play Recursion on spotify" on Play Music (
166.
by fest 6y ago
I remember composer as the package manager that required a gigabyte of RAM to install a few dozen of dependencies for some framework.
167.
by fest 6y ago
That is indeed interesting, I haven't seen it in the wild. Lot's of bad solder joints, shorted MLCCs- sure. I'm now tempted to scratch the ones used in designs I have access to.
168.
by fest 6y ago
The physical layer for eMMC is SDIO- the same is used for SD cards, at least if you want more than ~ a megabyte/s of interface bandwidth. IIRC the layers above SDIO are slightly different for eMMC and SD(HC), but generally SoCs that ha
169.
by fest 6y ago
The scenario you describe is very unlikely (the conductive part of chip resistor is enclosed in protective coating). What is a lot more likely is one of the following: * Engineer sent incorrect assembly drawing (sometimes when components ar
170.
by fest 6y ago
Oh yes, it can bring the cost of design and development down, agreed.
171.
by fest 6y ago
I don't see it as lowering the cost of entry much (i.e. FPGA chip with reasonable number of gates for Linux is on the order of 50EUR/pc, and general purpose CPU performance is not even remotely close to, let's say Allwinner o
172.
by fest 6y ago
Sidenote: LiteX is awesome. Knowing next to nothing about it, I was able to create a customized system-on-chip with RiscV CPU, several SPI/UART/I2C buses, load it on a devboard and blink some LEDs in an evening or two. The resulti
173.
by fest 6y ago
I'm having a hard time imagining smartphone/tablet/smart TV with a CPU like this. I wonder what is Allwinner betting on?
174.
by fest 6y ago
What is the consensus on using/extending GPL licensed code in the web backend?
175.
by fest 6y ago
I was under impression that class A amplifiers generally have the best amplifier characteristics (linearity, THD), and class D was mainly used in applications preferring efficiency/size/price over audio quality. Apparently class D
176.
by fest 6y ago
A few weeks ago I was scratching my head why scp was working on an embedded board and sftp- not. Yocto's default build recipes did not include the required plugin/library for sftp functionality.
177.
by fest 6y ago
My relatives who run a farm (some tens of cows, pigs, chickens, various crops for sale and food) do it on I believe around 25 acres of farmland plus a few acres of forest (for firewood). They are able to sustain a family of 5 people (3 grow
178.
by fest 6y ago
One potential market this seems to corner is software engineers without much hardware background willing to dip their toes in product design or proving some concept for a startup (think of adding a touch of interactivity to museum exhibit o
179.
by fest 6y ago
Olimex is Bulgarian company, are you sure it ships from Turkey?
180.
by fest 6y ago
One aspect is licensing: IIRC the core libraries are under LGPL. Another aspect is: there are some poorly documented idiosyncrasies in the standard library. I was personally bitten by the fact that delay disables interrupts (makes sense fro

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