lpmay

6 ms·

1.
by lpmay 2y ago
I would never have guessed this configuration was so rare. D-sub connectors seem to have more active use in aerospace and defense that you might expect (Until I started working professionally, I always associated them with "old" c
2.
by lpmay 3y ago
yes sorry, pitch is smaller density is higher
3.
by lpmay 3y ago
The important distinction is between on-silicon interconnects and off-silicon. On silicon, the interconnect density is much higher so it's feasible to get high bandwidth by having lots of "channels" (wide busses). This beco
4.
Freecomputerbooks.com(freecomputerbooks.com)
228 points by lpmay 4y ago|41 comments
5.
by lpmay 4y ago
The "PIC32" family from microchip is also MIPS based
6.
by lpmay 5y ago
No problem! You are not the first person I've heard express the impression that the MSP430 is slipping into irrelevance, and while I agree the places it shines may be getting squeezed by low power ARM parts I think they can be pretty
7.
by lpmay 5y ago
I think the platform is very much still alive and kicking. It is still the only uP platform I am aware of which is available with embedded FRAM which is low power, non volatile, extremely more write durable than flash and rad hard. Again,
8.
by lpmay 5y ago
It's up to hobbyists what's worth it to them, but the power consumption of the ESP 8266/32 is not _really_ comparable to the '430. "Deep sleep" mode on the ESP seems to be about 20uA, an MSP430FR5969 can go to
9.
by lpmay 5y ago
Don't know if their copy editors read these, but "Gallium Nitrate" is surely a typo for "Gallium Nitride" (GaN). GaN is a wide bandgap semiconductor, Gallium Nitrate is apparently some sort of drug.
10.
Yokogawa Minimal Fab(yokogawa.com)
3 points by lpmay 5y ago|0 comments
11.
by lpmay 5y ago
It's because the speed of sound (in any material) is much slower than the speed of light (even in high dk materials). To make a selective and low loss filter you want to use resonators which have dimensions which are a large fraction
12.
by lpmay 5y ago
Just a hint - extra attributes in the `mkShell` appear as environment variables in the built shell. So instead of a `shellHook` for this you can just have an attribute `ERL_LIBS="";` I'm not completely sure but I think this
13.
by lpmay 6y ago
Also see meson's[0] built in package management called wrap-db[1] [0] https://mesonbuild.com/ [1] https://wrapdb.mesonbuild.com/
14.
by lpmay 6y ago
Down to DC? That should be a surprise, because it's certainly not true! Faraday's law of induction only applies to varying fields, which means AC or physical movement. Remember, it's perfectly normal and common to have a s
15.
by lpmay 7y ago
What is "OBD-C"? Did the appropriate the USB-C connector for an OBD connection for some reason?
16.
by lpmay 7y ago
No, the power consumed is equal. The capacitance doesn't stop charging at time tao as you imply, it continues to charge until it reaches the final driving voltage, which is why integrating to infinity is a (very) much closer approximat
17.
by lpmay 7y ago
No, the power consumed is equal. The capacitance doesn't stop charging at time tao as you imply, it continues to charge until it reaches the final driving voltage, which is why integrating to infinity is a (very) much closer approxi
18.
by lpmay 7y ago
Yes, but I don't think your refuted my point. 16 bits (96dB SNR) is pretty good for an 18MHz signal processing system. Comparing it to a 18MHz 8bit AVR with a 10bit, 15ksps ADC is probably missing what makes this potentially cool.
19.
by lpmay 7y ago
Sure, but analog processing happens continuously and at an SNR that is equivalent to a very high bit depth. If you had an analog processing chain with 18MHz of BW (which granted you'd need somewhat more GBP), that would be more akin t
20.
by lpmay 8y ago
The Waytools text blade sounds somewhat similar to what you're describing: https://waytools.com/
21.
by lpmay 8y ago
I love this article, but I just can't help but pick at this nit I have with the "charging the capacitors" part. I'm not intimately familiar with Ethernet specifically, but I am an electrical engineer. Since the voltage
22.
by lpmay 8y ago
Nice. Do you have any guides you wrote or used that you can recommend? I'm looking at getting SmartOS set up at home as well, but I know I've got a lot to learn.
23.
by lpmay 8y ago
Maybe even hotter than inside, since the epoxy reaction is exothermic as it cures.
24.
by lpmay 8y ago
Another cool thing, that was counter intuitive to me is that more than just rejecting multipath, spread spectrum can actually make use of multipath to improve the link (although I doubt it is done much in practice). Conceptually, what you d
25.
by lpmay 8y ago
Also, the input stage is where noise figure is critical. Larger transistors are lower noise figure.
26.
by lpmay 8y ago
Yea, it's quite possible that something changes at these (scary) high charge rates. Maybe charge efficiency takes a nosedive, or there are some other effects that are non-linear with charge rate. Thanks for the link.
27.
by lpmay 8y ago
Oh, no doubt heat is also not good for batteries (neither is the cold). I didn't mean to imply it wasn't. However I'm still not sure heat is the first order effect limiting charge rates. If you consider that the charge effic
28.
by lpmay 8y ago
I'm not an electrochemist, but I have been told one of the major wear mechanisms is lithium plating, which is a function of anode voltage and charge current (and probably 100 other things). As I understand, the standard CI/CV cha
29.
by lpmay 8y ago
Mixers are physical systems. The precise words for the distinction you are trying to make is between linear and non linear systems.
30.
by lpmay 9y ago
I don't see it mentioned here, but the dask library looks like a promising solution,. It has ways to handle to these kinds of large datasets, and efficiently schedule computations that don't fit a numpy model. Worth a look.

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