#electronics
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I finally published the repo for the rust CANOpen stack I've been working on, and wrote a post about it:
https://jeffmcbride.net/blog/2025/06/05/introducing-zencan/
It's still woefully incomplete, and needs a lot more contact with real problems to find the issues, and then I can decide if this is a good idea or a huge waste of time :).
I have never actually published a crate before, and soon I will publish 5!
Releasing a new project for developing CAN bus devices…
jeffmcbride.netAfter 15 minutes of my time and £3 on eBay, my sister’s heated throw is functional once again.
For such an expensive item (StaySnug), the controller doesn’t seem to be very well designed.
Surely resistors shouldn’t get that hot in normal use?
At least there was a thermal fuse… 
#electronics #repair #fix #staysnug #resistor #thermalfuse #overheated
Before & after.
"Just review the literature and use the standard formula!"
the literature be like
#electronics
![# [Wong1992] K. H. Wong, “Characterization of calibration standards by
# physical measurements,” in 39th ARFTG Conference Digest, vol. 21,
# 1992, pp. 53–62.
def short_wong(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = (1 / (2 * pi)) * log(d_outer / d_inner)
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (2 * sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='wong')
# [Ung2023] D. C. X. Ung, "Modelling Coaxial SHORT and OPEN Calibration
# Standards," 2023 5th Australian Microwave Symposium (AMS), Melbourne,
# Australia, 2023, pp. 49-50, doi: 10.1109/AMS57822.2023.10062343.
#
# Identical to [Wong1992], except that the surface resistance misses a
# factor of sqrt(1/2), typo suspected.
def short_ung(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = (1 / (2 * pi)) * log(d_outer / d_inner)
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='ung')](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/ab3ffaff-b21a-416e-8dc0-1d493c33a74f.png "# [Wong1992] K. H. Wong, “Characterization of calibration standards by
# physical measurements,” in 39th ARFTG Conference Digest, vol. 21,
# 1992, pp. 53–62.
def short_wong(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = (1 / (2 * pi)) * log(d_outer / d_inner)
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (2 * sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='wong')
# [Ung2023] D. C. X. Ung, \"Modelling Coaxial SHORT and OPEN Calibration
# Standards,\" 2023 5th Australian Microwave Symposium (AMS), Melbourne,
# Australia, 2023, pp. 49-50, doi: 10.1109/AMS57822.2023.10062343.
#
# Identical to [Wong1992], except that the surface resistance misses a
# factor of sqrt(1/2), typo suspected.
def short_ung(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = (1 / (2 * pi)) * log(d_outer / d_inner)
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='ung')")
![# [Kang2005] J. S. Kang, J. H. Kim, and D. C. Kim, "Phase analysis
# of coaxial short and open circuits," IEEE Transactions on
# strumentation and Measurement, vol. 54, no. 2, pp. 701-704,
# 2005.
#
# Similar to [Wong1992], except that no scale factor is used for the
# coax cables. Instead, the short circuit reflection in coax is
# approximated as the free-space EM wave reflection from a piece of metal.
# The reference impedance is not explicitly mentioned, but coax's
# characteristic impedance is implied in the context.
def short_kang2005(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = 1
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (2 * sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='kang2005')
# [Cho2019] Chihyun Cho, Jin-Seob Kang, Joo-Gwang Lee, Hyunji Koo,
# "Characterization of a 1 mm (DC to 110 GHz) calibration kit for VNA,"
# Journal of Electromagnetic Engineering and Science, vol. 19, no. 4,
# pp. 272–278, 2019.
#
# [ChoErratum2021] Chihyun Cho, Jin-Seob Kang, Joo-Gwang Lee, Hyunji Koo,
# "Erratum to 'Characterization of a 1 mm (DC to 110 GHz) Calibration Kit
# for VNA'". Journal of Electromagnetic Engineering and Science. vol. 21.
# pp. 165-165, 2021.
#
# The only difference from [Kang2005] is that free-space impedance is
# used as the reference impedance for signal reflection, instead of](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/c0487c86-e8f3-4995-b049-834b7b9228b2.png "# [Kang2005] J. S. Kang, J. H. Kim, and D. C. Kim, \"Phase analysis
# of coaxial short and open circuits,\" IEEE Transactions on
# strumentation and Measurement, vol. 54, no. 2, pp. 701-704,
# 2005.
#
# Similar to [Wong1992], except that no scale factor is used for the
# coax cables. Instead, the short circuit reflection in coax is
# approximated as the free-space EM wave reflection from a piece of metal.
# The reference impedance is not explicitly mentioned, but coax's
# characteristic impedance is implied in the context.
def short_kang2005(freq_list, d_outer, d_inner, mue_r, sigma):
mue_0 = 1.25663706127e-6 * mue_r
coax_factor = 1
omega = 2 * pi * freq_list
r_surf = sqrt(omega * mue_0 / (2 * sigma))
z_surf = (1 + 1j) * r_surf
z_shorting_plane = z_surf * coax_factor
return skrf.Network.from_z(frequency=freq, z=z_shorting_plane, name='kang2005')
# [Cho2019] Chihyun Cho, Jin-Seob Kang, Joo-Gwang Lee, Hyunji Koo,
# \"Characterization of a 1 mm (DC to 110 GHz) calibration kit for VNA,\"
# Journal of Electromagnetic Engineering and Science, vol. 19, no. 4,
# pp. 272–278, 2019.
#
# [ChoErratum2021] Chihyun Cho, Jin-Seob Kang, Joo-Gwang Lee, Hyunji Koo,
# \"Erratum to 'Characterization of a 1 mm (DC to 110 GHz) Calibration Kit
# for VNA'\". Journal of Electromagnetic Engineering and Science. vol. 21.
# pp. 165-165, 2021.
#
# The only difference from [Kang2005] is that free-space impedance is
# used as the reference impedance for signal reflection, instead of")
Nano probe kits back in stock.
Great for debugging your project, on your desk, without resorting to the "big" Oscilloscope, power and leads.
Ideal for basic debugging of GPIO issues.
https://extkits.co.uk/product/nano-probe-logic-probe-oscilloscope
@mike@mikecoats.socialMy latest blog post: I presented at the 2025 Open Hardware Summit
https://mikecoats.com/presented-at-ohs-2025/
Apologies for the break in blogging, but I've spent the past month preparing for, and then giving, my 'VanSpoof and F**dG3ar' talk at the 2025 Open Hardware Summit.
#electronics #eBike #hardware #OHS2025 #openHardware #openSource #reverseEngineering #vanMoof
Apologies for the break in blogging, but I've spent…
mikecoats.comCollege wins state science competition | Archives https://www.byteseu.com/1076301/ #8282973811 #8287262200 #AlexVandivier #AmateurRadio #CaldwellCommunityCollege #CaldwellCommunityCollege&TechnicalInstitute #CameronWilliams #captain #CatoriWilkie #EbbonCook #electronics #ElijahNash #HighAltitudeBalloon #LexPhillips #MarinaHerrera #RalphAnderson #RonaldPerezCardenas #Science #secretary #TechnicalAdvisor #TechnicalInstitute #ThomasManning #www.cccti.edu
AI data centers are making your electricity supply worse and could damage your home, new study says
Katie Balevic, Lloyd Lee
December 29, 2024
"A Bloomberg analysis assessed readings from some 770,000 homes from February to October and found that over 75% of 'highly distorted power readings across the country are within 50 miles of significant #DataCenter activity.'
"Stresses on the power grid can lead to inconsistent power quality, and as the power quality decreases, the risk increases, Bloomberg reported. Inconsistent energy flow can cause #electronics to overheat, leading to sparks or even #HouseFires.
"A small handful of large tech companies own the vast majority of global data centers — and they show no signs of slowing down as they pour billions into building more powerful AI models.
"#Amazon, #Google, and #Microsoft own about 65% of the cloud infrastructure market, which includes data centers, according to a 2023 report from market research firm Synergy Research Group.
"Google announced in April that it's investing $3 billion to build and expand data centers in #Virginia and #Indiana. The search engine giant unveiled its latest AI model, #Gemini 2.0, in December.
"#Amazon, which is a large investor in AI startup #Anthropic, is investing another $10 billion in Ohio data centers, Gov. Mike DeWine announced on December 16.
"Microsoft, which has invested $13 billion in ChatGPT-maker OpenAI, said in September that the company has partnered with other investors, including #BlackRock, in a $100 billion energy infrastructure project. The project will include 'new and expanded data centers,' the company said.
"To meet AI's increasing energy demands, companies like Google have also started turning to #NuclearPower to find more reliable and sustainable energy sources."
https://www.aol.com/news/ai-data-centers-making-electricity-195931626.html?guccounter=1
#AIColonialism #NoNukesForAI #AISucks #WaterIsLife #Enshittification #AIPollution #NoisePollution
#DataCenters
Your electric supply might be paying the price for…
AOLElectric shavers have been a mature technology for a very long time. This means that a 10-y-o unused shaver is just as good as a new one. I discovered a simple way to save on buying one. Dealers still have lots of older models in stock. I searched online for lower and lower Braun model numbers until I found one that cost 1/5 of the current model.
MIT Rad Lab Series, volume 10. A century later, it still helps me calibrating my VNA. #electronics
![Termination of a Coaxial Line by a Capacitive Gap. - A junction of a coaxial guide and a short circular guide (principal mode in coaxial guide, no propagation in circular guide).
Fig. 4-5-1. Coax inner diameter denoted as 2b, outer diameter 2a, the gap between the coax cable and the short circuit of the outer conductor is d (side view), the reference plane is directly located at the shorting plane. The equivalent admittance of the termination is Y0, the capacitance is jB.
Equivalent-circuit parameters. - At the reference plane T.
B / Y0 = 4b / lambda ln [(a / b) (pi / 4) (b / d) + ln ((a - b) / d)]](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/957c862e-54be-4bed-b9c8-4e1466e60f13.png "Termination of a Coaxial Line by a Capacitive Gap. - A junction of a coaxial guide and a short circular guide (principal mode in coaxial guide, no propagation in circular guide).
Fig. 4-5-1. Coax inner diameter denoted as 2b, outer diameter 2a, the gap between the coax cable and the short circuit of the outer conductor is d (side view), the reference plane is directly located at the shorting plane. The equivalent admittance of the termination is Y0, the capacitance is jB.
Equivalent-circuit parameters. - At the reference plane T.
B / Y0 = 4b / lambda ln [(a / b) (pi / 4) (b / d) + ln ((a - b) / d)]")
I'm diving down the mini-rack rabbit hole. (and blaming @geerlingguy <g> )
Most build these racks for networking and RPi systems. I'm building one for radio equipment, and another as an outboard patch bay for my #eurorack synth.
I bought these two blanks as spacers so I can build a wooden cabinet around the rack rails. The blank will eventually be a power supply and mains switch. The cable entry one will have its brush removed and turned into a display. :-)
A reason we use crystal oscillators at 32.768 kHz for clocks is because anything less than 20 kHz is going to produce a noise audible to humans. The signal is usually divided by passing it through multiple stages of flop-flops down to exactly 1 Hz
Animals have a wider range of hearing than us. For instance, cats can hear up to 85 kHz. This means that they may be sensitive to noises our devices produce that are imperceptible to us, which may have effects on them we rarely consider
/me Writing a small script to fit custom and unknown SOLT calibration standards for VNA measurements. I'll also publish a tutorial for relatively rigorous way to measure an random open/short calkit even if you don't have a pre-existing calkit based on the previously developed SDDL method, which only assumes a flush short. #electronics
![[user@openwork solt-fitting]$ ./main.py fit-open -h
usage: main.py fit-open [-h] --input TOUCHSTONE_FILE [--fitting-goal FITTING_GOAL] [--delay DELAY_SPEC] [--loss LOSS_SPEC] [--coeffs-preset COEFFS_PRESET]
[--coeffs-dimension COEFFS_DIAMETERS] [--coeffs-raw COEFFS_SPEC] [--coeffs-scale COEFFS_SCALE] [--port-z0 PORT_Z0]
[--offset-z0 OFFSET_Z0] [--plot] [--no-plot]
options:
-h, --help show this help message and exit
--input TOUCHSTONE_FILE
S-parameter input file (s1p)
--fitting-goal FITTING_GOAL
fitting objective, can be "complex" or "phase", "phase" is the default, as measurement noise is usually too large to determine a
0.01 dB scale of loss in the magnitude, destabilizing the fitting. N.B: "complex" is currently unusable, reimplementation needed
--delay DELAY_SPEC offset delay in picoseconds (default: auto)
--loss LOSS_SPEC offset loss in gigaohms per second, as measurement noise is usually too large to determine a 0.01 dB scale of loss, 0.0 or a fixed
typical loss is recommended, see manual. Use "auto" to enable (default: 0.0)
--coeffs-preset COEFFS_PRESET
coax cable type, used to calculate parasitics coefficients C0/C1/C2/C3 (open) or L0/L1/L2/L3 (short) via standard engineering
equations, recommended, since pure fitting results (via --coeffs-raw) can](https://misskey-taube.s3.eu-central-1.wasabisys.com/files/e2c37b02-4108-4260-97ac-871cc1511585.png "[user@openwork solt-fitting]$ ./main.py fit-open -h
usage: main.py fit-open [-h] --input TOUCHSTONE_FILE [--fitting-goal FITTING_GOAL] [--delay DELAY_SPEC] [--loss LOSS_SPEC] [--coeffs-preset COEFFS_PRESET]
[--coeffs-dimension COEFFS_DIAMETERS] [--coeffs-raw COEFFS_SPEC] [--coeffs-scale COEFFS_SCALE] [--port-z0 PORT_Z0]
[--offset-z0 OFFSET_Z0] [--plot] [--no-plot]
options:
-h, --help show this help message and exit
--input TOUCHSTONE_FILE
S-parameter input file (s1p)
--fitting-goal FITTING_GOAL
fitting objective, can be \"complex\" or \"phase\", \"phase\" is the default, as measurement noise is usually too large to determine a
0.01 dB scale of loss in the magnitude, destabilizing the fitting. N.B: \"complex\" is currently unusable, reimplementation needed
--delay DELAY_SPEC offset delay in picoseconds (default: auto)
--loss LOSS_SPEC offset loss in gigaohms per second, as measurement noise is usually too large to determine a 0.01 dB scale of loss, 0.0 or a fixed
typical loss is recommended, see manual. Use \"auto\" to enable (default: 0.0)
--coeffs-preset COEFFS_PRESET
coax cable type, used to calculate parasitics coefficients C0/C1/C2/C3 (open) or L0/L1/L2/L3 (short) via standard engineering
equations, recommended, since pure fitting results (via --coeffs-raw) can")
Humanoid Robots *ARE* The ‘Space Race Of Our Time' - jeez, did AI write this headline, Forbes?
#robotics #robot #technology #engineering #robots #arduino #electronics #automation #tech #innovation
China is investing $138 billion in its domestic robotics…
Forbes100 educational groups, teams, and institutions are supported by us in their hardware endeavors.
From student team to Hackerspace we help people build the future, no matter if it’s a robot, race car, or satellite.
Are you part of a #student team or #Hackerspace or simply working on a cool #project? Shoot us a message here on Mastodon, and we'll have a chat on how we can support your goals.
Wanna learn #MicroPython programming and build a simple #robot with Raspberry Pi Pico? It's easy with BEAPER Pico!
Save $10 on a BEAPER Pico electronic parts kit using code PICOHAMFEST at checkout until June 9: https://mirobo.tech/beaper-pico
Find out more about BEAPER Pico here: https://youtu.be/DOxU7mvjICc
#STEMeducation #electronics #robotics https://techhub.social/@mirobotech/114615999530039851
Going to build Tynemouth Software's recreation of the #JupiterAce on a live stream "Minstrel 4th"
One of two kits I recently got from @rc2014, technical issues befell recording/streaming my build of the other one but this should be fine 
watch.thepolarbear.co.uk
#Electronics #RetroComputing
Hot air SMD rework practice 
Now, how do I put this BGA chip back on its tiny pads without an X ray machine? 
anyone got a good reference design for a USB 3.x multiplexer suitable for use in a KVM switch?
ideally for USB 3.1 or 3.2, but I'll take 3.0. most of the ICs I'm finding are designed for handling superspeed pairs in USB-C connector rotation, but what I want is a complete SPDT switch between two ports, and I'm struggling to find any useful appnotes that describe a complete design for that. I could hack something together but it'd be nice if there's a low-complexity solution.
Yes, it's due to #Donnie and his #TACO #tarrifs ...
Within a month of their early warning, #Lacroix, the #French manufacturer of #electronics , and #Automotive component supplier, has announced it will likely close _both_ of it's North American plants by the end of the year.
Between the #GrandRapids , #Michigan, and the #Juarez , #Mexico plants, 1200 people are slated for layoffs to begin this month, to be completed by December 31st.
A French electronics manufacturer which employs 115…
WGVU NEWSIt's teacher Tuesday!!
Are you teaching #electronics, computer technology, or #robotics? Would you like an ARPS-2, BEAPER Nano, or BEAPER Pico bare PCB for free?!?
I have too many pre-production PCBs cluttering up my office. 
DM me, or use the contact form at https://mirobo.tech/ – Sorry, I'll only mail them to schools in Canada or the USA.
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