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Espressif has announced the ESP32-E22, its first Wi-Fi 6E SoC designed as a radio co-processor for high-performance connected devices, featuring tri-band Wi-Fi 6E, Bluetooth dual-mode, and a dual-core RISC-V processor.

This article shows how to drive a large WS2812B LED ring with a Raspberry Pi Pico or Pico 2, creating festive light effects and even using the ring as a low-resolution display.

Discover Angelo, an open source portable audio amplifier designed to improve communication with elderly or hearing-impaired people. This project combines simple electronics with a human-centered approach, making it easy to build, customize, and use.

A antenna tuner circuit which incorporates the resistance of the panel meter light into the accuracy of the meter. One must wonder why they would do this. They no longer support this unit so the bulb is hard to find. It is an axial lead bulb much like a axial lead resistor. I could replace the bulb with a resistor that is the same ohms as the bulb, I suppose. No back lit meter then but at least the meter would work again. Dumb design. submitted by /u/RefrigeratorLess9786 [link] [comments]

Чеська компанія RSE відкрила в КПІ ім. Ігоря Сікорського Energy Resilience Lab з обладнанням MWM Київ, 27 серпня 2026 року KPI4U-2 пт, 08/28/2026 - 16:29

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Iteration3D is a French web platform that generates customizable 3D models for printing, using a parametric engine to create models on demand based on user specifications.

i had one mechanical keyboard after getting bored i tried to reverse engineer it but i couldn't send any usb data or i could not see much on the terminal when i tried to see if it listens to the data and after opening i saw that it only takes +5v and gnd plus the processor something like BYK.. was a hard coded chip that doesnt listen notes i was newbie to hardware and really scared to try anything. so i gave up but seeing my brother have a kreo rgb keyboard it gave me some boost to open it up and i learned so much and burnt my hand while trying to solder. heck i even burnt the solder iron's wire itself (sniff sniff whats that smell). so the plane was that i would use a mcu as esp 32 or pico that listen to my command and can do anything that i want . first month really .... i bought a mulitmeter and did the traces of all the rows and col sicne there was no pcb and other design files there i didnt know how keyboard matrix works at all i went rhough whole thing.. after getting all the traces and nothing them i was really soul scattered by the fact how this whole thing worked but then i got to know this was a common thing everyone knew this. after this i took pico as the main mcu why... it was small it has higher clock speed. it was one sale since the esp was on boom and the price of pico was dropped it has more computer power that i needed for Fourier transform for disco light that i wanted for the custom rgbs i would put there quickly after that i ran into a problem of less gpio also after that i took a longer time to solder since i was learning and it was very scarry to solder on the pcb but as i did i grew more confident .. after burning my finger prints. i bought a io expander because of 6 rows and 17 cols it got burnt and again tried that was jittering the one signal was affecting other signal. so i gave up 3-4 cols and went for the gpio full on. The RGBs... Hardest the rgb i had to cut each rgb strip stick them all on each keys then use the single core wired without the cover and solder each joints aroung 300 small pieces of them total 600 joints appx and it was tough because heating one end would make other end heat up also. but since i cascaded 100 of them the voltage kept decreasing and it was 0.5v at the end so i just provided supply from both of rows and it worked and there was no deeming and jitters. thats it... if u want to know about the logic behind it then u can ask me i will add it most of things and testing and all the stuff is in the video submitted by /u/shiv20242028 [link] [comments]

Learn how to set up a virtual machine with VirtualBox and install Ubuntu or Kubuntu safely, from downloading the software to enabling Guest Additions and optimizing performance.

I had a lego pack sitting around that I has sorta messed up years ago for somthing, desided see if I could jam a 9v to 5v converter in it, to say the least I sorta went way smaller than I actually needed, in theory it can take 1.5 amps, I wont get even close to that using it, to help with the heat it has some copper sheet attached the sits against the AA to help spread heat from it, parts used are two 10UF caps, ceramic 0.47UF on 9v side and a ceramic 0.1UF on the 5v side, the souldering is a little rough, but this is the smallest thing Ive ever made by far, Im sure it would be better if I did it a few times. submitted by /u/dronko_fire_blaster [link] [comments]

📌 Сесія професорсько-викладацького складу kpi чт, 08/27/2026 - 21:39

BluGlass Ltd of Silverwater, Australia — which develops and manufactures gallium nitride (GaN) visible laser diodes based on its proprietary low-temperature, low-hydrogen remote-plasma chemical vapor deposition (RPCVD) technology — has appointed Yam Rubenstein as a non-executive director to support its growing global operations...

📰 Газета "Київський політехнік" № 27-28 за 2026 (.pdf) Інформація КП чт, 08/27/2026 - 15:54

КПІ ім. Ігоря Сікорського відвідав віцепрезидент і керівник апарату президента американської компанії Lockheed Martin — Річард «Оттер» Б’ю KPI4U-2 чт, 08/27/2026 - 15:13

While updating and streamlining the hardware setup improved the situation, why it achieved this welcome outcome was less clear. And then there was the truly “shocking” discovery…

Last time, in part 1 of this series, I gave a historical overview of my longstanding broadband and television relationship with Comcast (aka Xfinity, the company’s brand for consumer products and services), focusing on the service in my most recent (and current) Colorado residence.

Specifically, I discussed the increasing frequency and severity of service “drop” issues my wife and I experienced subsequent to inadvertent cabling damage consecutively done by our community’s water and sanitation service provider last October and our power company earlier this summer.

At last week’s writeup’s conclusion, I was awaiting the arrival of yet another Comcast technician, subsequent to a recent service issues-escalation to a near-daily cadence (a particular problem given that my wife and I both work from home), an on-site visit which I’d insisted on sticking with in spite of the service’s as-usual temporary resurrection later that same evening. The on-site technician visit wasn’t scheduled until the next afternoon, but he called me mid-morning that (next) day and asked if he could arrive early, a rare deviation from the “late arrival” norm.

Competence is the best

Appreciative of his promptness and hopeful that I could still persuade him into making the debug session gratis for us, I asked him to delay his arrival only 45 minutes until my wife and I had both wrapped up a few work to-dos. He happily obliged, subsequently pulling up on the street in front of our house right on time. I’m not sure whether he was an “official” Comcast employee or a contractor, not that it really matters; his vehicle was a minivan with no corporate markings on it, albeit filled with Xfinity-branded tools, cabling, and other equipment.

I identified myself as a “techie” and asked if I could follow him around, periodically picking his brain and more generally absorbing through observation at least a bit of his conceptual plus experience-accumulated knowledge. He was happy to oblige: “this’ll be fun” were his exact words. And indeed he was smart and nimble of mind, not to mention enthusiastic; a delightful experience, all in all. But he also was in a hurry, so I strove to practice appropriate question-cadence restraint.

The first notable thing I learned from him was that the strand of coax coming out of the ground around the back of the house was completely unrelated to the plastic box labeled “Comcast” attached to the wall on the other (front corner) end of the house, first mentioned and pictorially shown in part 1 of this series.

This cable ran straight to the tap near the street. I assumed it was the mysterious “other line of service that the prior owner had installed” mentioned by the realtor more than a decade earlier.

Speaking of taps, not to mention the RF amplifiers I mentioned last time, along with other constituent building blocks of a hybrid fiber-coax system such as Comcast’s, check out this block diagram from Wikipedia’s as-always thorough, accurate and otherwise excellent entry on the topic.

I don’t know, by the way, where the fiber-to-coax conversion node(s) is/are located in our community, either in general or to what degree of proximity to my residence location.

MIA (not to mention obligatory)

The second thing the technician immediately noticed and I learned, to our mutual great dismay, was that this length of coax was nowhere properly earth-grounded nearby where it entered my home. The plastic box, which I was now realizing was likely associated with the legacy Comcast service likely stretching back to the original owners, was grounded.

As was the tap near the street.

But here? Nothing. Thereby representing not only potentially serious fire and electrocution danger for the home and its occupants but also suggestive of why I’ve endured multiple bouts of electrical shock-induced equipment destruction in my so-far time here (ironically, by the way, there’s a summer-monsoon lightning storm underway as I type this).

Then he saw the three-way splitter attached to the outer wall, which predated (by how long I have no idea) the initiation of my home ownership. Attached to the input end was the PoE (which stands for point-of-entry in this particular case, not power over Ethernet) filter I’d subsequently added for network security purposes back when I was experimenting with MoCA, and which I’d neglected to remove afterwards.

And attached to the splitter outputs were short spans of coax that ended up at wall connectors in two downstairs bedrooms (one each), along with a longer third coax span that also ended up inside, this time in the furnace room, where it split one more time and fed both the CableCARD receiver and cable modem.

After shaking his head and muttering “I don’t know how you even have any broadband service at all” under his breath, he fired up his smartphone, on which was installed a Comcast-proprietary (presumably) app that enabled him to live-monitor my cable modem’s statistics over its WAN connection. Once again, this time louder and more emphatically, he said (and this time also gestured), “I don’t know how you even have any broadband service at all” and invited me to look at the phone display for myself.

I noticed that the upstream transmission power ratings for the various in-use channels were all in the upper 50 dBmV range. I didn’t know much (and still don’t know as much as I’d like) about cable systems, but I knew enough to realize that this wasn’t a good thing.

Swaps and simplifications

Again, I realized he was in a hurry, so I refrained from asking a bunch more questions. He indicated that he thought the existing splitter was left over from a long-past satellite television system installation. I don’t quite buy that theory; although the DC power pass-through support and broader top-end frequency afforded by such a splitter (2.4 GHz vs 1 GHz, with a common 5-MHz bottom end of the range), the latter theoretically allowing for neighbors’ latest-generation MoCA signals to “leak” into my setup, might destructively interfere with my DOCSIS 3.1 modem. So, the PoE filter I’d inadvertently left installed would (or at least should) have alternatively blocked neighborhood noise.

That said, the splitter and filter were admittedly ancient, both also containing passive RF circuitry. So, perhaps something inside either or both had gone awry with advancing age and longstanding lightning, moisture, temperature, and other ambient environmental exposure.

He asked if I was currently using the downstairs bedrooms’ splitter outputs. When I replied in the negative, he wholesale-replaced the splitter with a grounding block (and wire) containing an integrated PoE filter, leaving the other two previous splitter-supplied coax feeds detached.

He also swapped out the connectors on both ends of the new grounding block-plus-PoE filter combo. Then he revisited his smartphone app and happily reported that the data he was seeing was “still not great, but much better now, and good enough”. Again, I got only a brief glimpse of the screen, but enough to confirm that the upstream channels’ power measurements were all now comfortably in the lower end of the 50s dBmV range.

I wish they were even lower than that, but again, we’re at the end of the neighborhood “loop” line. And it’s been more than three weeks (as I write this) since his visit, with not a single service drop, so in the spirit of “perfect is the enemy of good”…I’m good!

In case you were wondering, by the way, I immediately ordered, and subsequently installed as soon as it arrived, a grounding rod to attach to the other end of the grounding block-and-wire he’d generously given me.

The sticker on the side of the rod’s snug plastic packaging was awesome.

When I walked him back to his car (passing by the mysterious plastic box marked Comcast on the way, of which he had no knowledge and no spare time to further explore that day), he gifted me a bunch of extra hardware—MoCA filters, grounding blocks, 2- and 3-way splitters, and a 10’ span of high-quality coax cable with connectors on both ends—all of which I’ll be discussing more in next week’s finale (as planned, but who knows for sure) to this series.

In the upcoming concluding post(s), I’ll suggest some possible theories as to why (and to what degree, straight from my cable modem’s logs) his efforts bore fruit. I’ll also share the results of my subsequent sleuthing regarding the aforementioned mysterious plastic Comcast box and the various cables running into and out of it, as well as what was within it. Stay tuned for that and more; for now, please continue to share your thoughts in the comments!

—Brian Dipert is the associate editor, as well as a contributing editor, at EDN.

Related Content

• Debugging intermittent Comcast, part 1: Scenario-setting
• Will a location change improve my MoCA?
• The whole-house LAN: Achilles-heel alternatives, tradeoffs, and plans
• A quest for faster upstream bandwidth
• Lightning strikes…thrice???!!!

The post Debugging intermittent Comcast, part 2: Remediation details appeared first on EDN.

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Почути звук із 13 століття завдяки науковцям ФЕЛ kpi чт, 08/27/2026 - 11:00

SemiQ Inc of Lake Forest, CA, USA — which designs, develops and manufactures custom silicon carbide (SiC) power semiconductors and 150mm SiC epitaxial wafers for high-voltage applications — has announced a distribution agreement with power electronics firm Ibérica Semiconductores de Potencia of Madrid, Spain...