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![In transmission line characterization, one should address such
mismatches by improving the simulation setup via better port
transitions. However, in this simulation, the mismatches are
intentionally introduced to demonstrate openEMS's ability to
accurately model real-world effects.
.. seealso::
The features introduced in this manual are only the tip of the
iceberg, it's not possible to cover all of its aspects here. See
the full manual [12]_ for usage. Here we mention two important
use cases.
**Calibration and de-embedding.** If a port mismatch is unavoidable,
post-processing techniques commonly used in Vector Network Analyzers
can be applied to openEMS simulations as well, such as the SOLT
calibration algorithm, or the newer IEEE P370 de-embedding algorithm.
This involves making additional measurements (simulations) with known
loads or structures at the port, so that the port or the test fixture's
influence can be solved and removed.
**Time-gating.** An alternative possibility is working in the time
domain using the equivalent TDR responses. If we transform the
measured S-parameters into a TDR plot, a time window can be applied
that focuses the response of only the DUT without the early and late
reflections by the ports. This window can then be transformed back
to the frequency domain to "clean" our S-parameters. This is not a
rigorous solution in comparison to applying proper calibration
algorithms, but is a quick-](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/d38b9413-db43-4cb1-b631-0eb83ed8c09b.webp "In transmission line characterization, one should address such
mismatches by improving the simulation setup via better port
transitions. However, in this simulation, the mismatches are
intentionally introduced to demonstrate openEMS's ability to
accurately model real-world effects.
.. seealso::
The features introduced in this manual are only the tip of the
iceberg, it's not possible to cover all of its aspects here. See
the full manual [12]_ for usage. Here we mention two important
use cases.
**Calibration and de-embedding.** If a port mismatch is unavoidable,
post-processing techniques commonly used in Vector Network Analyzers
can be applied to openEMS simulations as well, such as the SOLT
calibration algorithm, or the newer IEEE P370 de-embedding algorithm.
This involves making additional measurements (simulations) with known
loads or structures at the port, so that the port or the test fixture's
influence can be solved and removed.
**Time-gating.** An alternative possibility is working in the time
domain using the equivalent TDR responses. If we transform the
measured S-parameters into a TDR plot, a time window can be applied
that focuses the response of only the DUT without the early and late
reflections by the ports. This window can then be transformed back
to the frequency domain to \"clean\" our S-parameters. This is not a
rigorous solution in comparison to applying proper calibration
algorithms, but is a quick-")
TFW when you're ALMOST done routing traces on a PCB... because there's one nasty one left and you're too tired to figure out a path for it.
I'm quite proud of the Kodi remote I made. It's based on the M5Dial and M5 Joystick, and uses Kodi's UDP-based event server protocol for communication. It can also do MQTT to HomeAssistant, but that's still in the early stages.
GitLabSybren A. Stüvel / m5dial-kodi-remote · GitLabGitLab.com
Incredible how twist-lock powerbars are absolutely not a thing in North-American #hardware / #electronics stores (or any online store, even Chinese ones), and only found at reasonable prices in their natural habitat: #Japan.
I don't mean "twist to close", I mean twist-lock with the device plugged in. Incredibly useful for under-desk mounting, so that you can lock your "wall warts" in place without gravity (or any slight pull on the cord) unplugging them… this should be standard design.
My #lab is a #mess ...
(But, instead of cleaning it up, I'm working standing up and placing things over other things
)
#electronics #electronicslab
(But, instead of cleaning it up, I'm working standing up and placing things over other things
)#electronics #electronicslab
Dear Fediverse,
I have an old, Allegro 16 .brd file that I need to look at to extract mechanical dimensions from. The free Allegro viewer doesn't support this fileformat anymore and asks me to use the dbdoctor, which of course, is not available in a free version.
Would someone be so kind to convert this file for me into something that either works with the Allegro viewer or into something that could be viewed with open source tools?
I'm designing a small circuit board which will have an STM32 microcontroller.
One document from STMicro says that the part must have two capacitors to filter the power supply, a 'ceramic' cap at 100nF, and a 'chemical' cap at 4.7uF.
Another document says they should both be ceramic caps, and the Nucleo64 evaluation board (sold by STMicro) uses ceramic caps for both.
Should I bother using a different cap for the larger value? If so, what qualifies as a 'chemical' capacitor, just electrolytics?
so remember when I was joking about replacing FR-4 prepreg with a layer of barium titanate ceramic so you could have your entire power and ground layers act like a big distributed capacitor?
yeah turns out 3M had the same idea. they ground up a bunch of barium titanate, mixed it into their epoxy, and used it to make a line of fiberglass dielectrics for high embedded capacitance within PCBs. it achieves 14nF/in² and they sell it under the name "C-Ply".
https://www.ipc.org/system/files/technical_resource/E10%26S22_02.pdf
Ever needed to tri-state an #esphome GPIO?
HIGH and LOW not enough for your projects?
Need a bit of high-Z or dual-use the pin as Input?
Here's my solution:
My latest blog post: VanSpoof - Prototype 2 - Shrunken PCBs
https://mikecoats.com/van-spoof-prototype-2-hardware/
The VanSpoof PCB has to be no bigger than 31.5 mm by 21.5 mm to fit. Unfortunately, Molex's SMD footprints are quite wide so the board needed a fair bit of layout work to make everything fit.
mikecoats.comVanSpoof - Prototype 2 - Shrunken PCBs
More from 
Mike Coats 
Hey, #programming #electronics #arduino #microcontroller folks. Say I have a device like a joystick which generates its own data and clock signals, and I want a Pi Pico 2 to capture inputs from it.
What should the flow of that program look like? Do I just capture 2x the length of a full packet, find the single whole packet in it, read that and move on? How would you go about detecting and reading every individual packet?
Boosts and all comments welcome.
Big Changes Ahead For Interposers And Substrates
https://semiengineering.com/big-changes-ahead-for-interposers-and-substrates/
Semiconductor Engineering · Big Changes Ahead For Interposers And SubstratesNew materials and processes will help with power distribution and thermal dissipation in advanced packages.
Replied in thread
So it works. Any final guesses about what is it? #3Dprinting #diy #electronics
Replied in thread
This was a terrible idea... but somehow it works. #3Dprinting #electronics
Serial Experiments Lain (1998)
#serialexperimentslain #90s #cyberpunk #scifi #1990s #anime #electronics
#serialexperimentslain #90s #cyberpunk #scifi #1990s #anime #electronics
GIF
Continued thread
conduction and displacement current density around one plate of the parallel-plate waveguide, excited by a 5 GHz Gaussian signal on the left edge. #openEMS #electronics
GIF
The other day, I needed to solder some fine wire (28AWG or so; I didn't find a label) into an XT60 connector. (It's fine, it's fused).
I didn't want to embrittle the wire with solder wicking down inside it. While it is not in a vehicular application, it is not fixed, either.
So I crimped the wire into 0.5mm ferrules, and then soldered the ferrules into the XT60 connector. This seems to have worked well.
Has anyone else here used soldered ferrules to avoid wicking solder when you are making a connection where you have to use solder where you would otherwise prefer a crimped connection? I'd never heard of it to my recollection, but it seemed like such an obvious answer in hindsight, once I thought of it... 
Holy shit, the PCB design of this new sensor board, called Ophanim, of CERN’s Aegis experiment just fucking slaps. Right now, there don’t seem to be many images of it on the web, but I hope to see more in the future.
Continued thread
Just fixed several mistakes and TODO items. The current version is close to final, and only needs some minor edits. openEMS E&M field solver tutorial: First Lessons For Circuit Designers #openEMS #electronics
fasterems.github.ioFirst Lessons For Circuit Designers — openEMS 0.0.35 documentation