hybridfree/eevblog-posts huggingface dataset:
Varistor Replacement for 240V Hakko FX-888D After Transformer Modification - Page 1
Forum section: electronics / general

author: doomslayer2099
author_rank: Newbie
timestamp: October 04, 2024, 11:04:54 am
content: Hi everyone,I have a Hakko FX-888D originally designed for a 120V outlet. After replacing the transformer to use it with a 240V outlet, the Varistor (V271U) for the 120V transformer burst when I turned it on.Can I replace the V271U with a 05D471K Varistor for the 240V transformer?The Varistor is soldered onto the Hakko FX-888D's P.W.B, which is soldered onto the transformer.Thanks for any advice!

author: wraper
author_rank: Unknown
timestamp: October 04, 2024, 11:15:00 am
content: If it's connected across transformer primary winding, then yes.
Hurricane Helene effects on global semiconductor mfg - Page 1
Forum section: electronics / general

author: PwrElectronics
author_rank: Regular Contributor
timestamp: October 01, 2024, 06:45:20 pm
content: Saw in the news here in the US today that this hurricane has hit an area in North Carolina where a major world supply of quartz is mined for the semiconductor market. Several news outlets have more details.I had no idea that there were quartz mines there or that it is a major world supply source.Edit to add: The quartz is used to make the crucibles they melt the silicon in and must be ultra pure and usually get used only once.

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: October 08, 2024, 12:39:55 am
content: Quote from: PwrElectronics on October 01, 2024, 06:45:20 pmIt's something like 80% of the world's supply. But the amount used by the semiconductor industry is low. There should not be supply chain impacts, if that's what you're concerned about.Also I don't think the crucibles need to be as pure as the silicon used to make the boules themselves ... the latter is the real value add.
The best illustration I've seen yet of how a modern CPU is made. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: September 25, 2024, 02:06:09 am
content: This one really shows how small and all the steps and layers there are in a modern CPU.Enjoy:

author: Dundarave
author_rank: Regular Contributor
timestamp: September 25, 2024, 05:54:50 am
content: Thanks also for bringing the Branch Education channel to my attention: much to explore there as well!

author: mawyatt
author_rank: Super Contributor
timestamp: September 25, 2024, 02:49:48 pm
content: Nice video, thanks for postingNoted they only mention the FinFET which isn't the CMOS devices utilized in the latest nodes, these are GAAFET devices.Best

author: BrianHG
author_rank: Super Contributor
timestamp: September 27, 2024, 04:59:30 pm
content: See the real thing...A tour of Intel's new Arizona megafab by Gamers Nexus:

author: BrianHG
author_rank: Super Contributor
timestamp: October 04, 2024, 03:47:30 am
content: Doping: The Most Important Part of Making Semiconductors

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 04, 2024, 04:03:21 am
content: Quote from: BrianHG on October 04, 2024, 03:47:30 amIt's also the most important part in some sports.
Recommending a YouTube channel (oddball technical stuff) - Page 1
Forum section: electronics / general

author: IanB
author_rank: Super Contributor
timestamp: October 02, 2024, 03:10:55 am
content: It's not often I come across a channel that has been passed over by the algorithm, but I stumbled on one today, and it has lots of interesting videos to watch. It deserves more subscribers, so if you like the possibility of learning something you never knew before (like how to make a clay material that can be cured in a home oven), then give it a look:https://www.youtube.com/@ThinkingandTinkering

author: Halcyon
author_rank: Unknown
timestamp: October 02, 2024, 03:44:43 am
content: https://www.youtube.com/@CanadianMacGyverNot always electronics, but still very interesting.
Harvesting - Page 1
Forum section: electronics / general

author: Lomax
author_rank: Frequent Contributor
timestamp: September 29, 2024, 02:41:09 pm
content: It's that time of year, when the pile of old circuit boards has grown waist high, and it's time to harvest the crops... Not a massively bountiful yield this time, but enough to challenge me for storageSome highlights:Two Clare Pendar 5V SIP relaysA ten digit VFD with integrated driverA handful of Alps potsA clutch of microswitchesA bushel of heatsinks (one with a cute little fan!)A stack offull bridge rectifiersA cluster of linear regulatorsA profusion of power MOSFETs and BJTsAn abundance of PCB terminal blocksA vertical CR2032 battery holderA fistful of optocouplersA couple of OPAmpsSome DIL socketsA load of beefy electrolytics (tested good)A few crystal oscillatorsA smattering of trimpotsA mound of power resistorsThermistors, inductors, X/Y/1/2 caps, MOVs, GDTs...BNC, Ethernet, USB, 3.5mm, Firewire(!) and SATA PCB socketsPerhaps best of all, I can now empty the box and start collecting for next year's harvest...What are you harvesting this year?

author: RoGeorge
author_rank: Super Contributor
timestamp: September 29, 2024, 06:09:02 pm
content: Nice add to your inventory!Lately I've stopped desoldering the parts in advance. I let them stay on their original PCB, and only desolder when needed. That way is easier to browse the inventory, and the components remain "self-documented" by the vicinity with the nearby components and by the provenience of the PCB.Sometimes I reuse an entire area of the PCB by snapping or cutting out the PCB, then reuse that as a module in another build, without desoldering any components.

author: Gyro
author_rank: Super Contributor
timestamp: September 29, 2024, 07:04:21 pm
content: You missed the two common mode chokes.

author: Lomax
author_rank: Frequent Contributor
timestamp: September 30, 2024, 03:30:26 pm
content: I also harvested an acre of jellybeans that had been planted way back in 1990. This time the yield was more abundant and included a quad of dual comparators, an analogue switch IC, a 6-bit DAC and a cute little reset chip with battery back-up. Oh and anotherfull bridge rectifier, of course. The EPROM sat in a turned pin socket tooJust for a laugh I desoldered a 3V lithium backup battery and was astonished to see it still bang on three voltsthirty plus years laterQuote from: Gyro on September 29, 2024, 07:04:21 pmThanks, nabbed them too!Quote from: RoGeorge on September 29, 2024, 06:09:02 pmThank youI do keep boards with any significant amount of SMD parts, but THT I like to desolder and put in my assorters. The sense of order gives me a warm fuzzy feeling - very therapeutic

author: nctnico
author_rank: Super Contributor
timestamp: September 30, 2024, 03:36:22 pm
content: Suddenly I get an idea for a new song. It is called 'Hoarders Paradise' to the music of 'Gangsta's Paradise' from Coolio
Brymen BM257s saves me from mains shock therapy - Page 1
Forum section: electronics / general

author: bluevd
author_rank: Contributor
timestamp: September 30, 2024, 12:07:45 pm
content: Howdy folks,Long story short: a friend of mine is renovating an appartment he just bought and after a quick look, I advised him to also redo all the mains wiring since the old one is from the comunist era and has had "upgrades" along the way. It's a mix of aluminum and copper wires spliced in the most nightmarish ways. So, I started work, removed the fuses, removed the fuse box and connected a single fuse for a light and a plug to be used during the work (fuse is directly connected to the meter). Started to prepare the walls for the wires (in Romania all wires are ran through conduits which are burried in the walls). Hit what seemed to be and old distribution box and while trying to seperate the wires before removing them to have a clear path, the little bm257s staryed beeping. It was set in EF mode as I used it to check all the wires that were disconnected from the fuse box. What surprised me was that the DMM was between my feet and I gripped the wires by the ibsulation with pliers. If the thing didn't start beeping, I would have just cut the wires as all the wiring in the fuse box was "cold". While I do use PPE, it still would have been a nasty surprise. Bellow is a link to a short video showing the setup. I'm actually surprised how much the human body transmits electrical fields and while in the video I have my gloves off, it's the same with them on. Guess this little buddy saved me from a nasty surprise.https://youtu.be/2uC-8aUpfwM?si=FVrZBVg4jKIa6KhR
Super Game Boy gets an upgrade - Page 1
Forum section: electronics / general

author: Bryn
author_rank: Regular Contributor
timestamp: September 28, 2024, 04:31:15 pm
content: If anybody here is old enough to recall the Super Game Boy, an adapter for the SNES that lets you play Game Boy games on it, iit's been granted an upgrade. This was made in response to the major flaw with the original device, where the clock speed for games played on it was 2.4% faster although was corrected with the Super Game Boy 2, released in Japan only.While it allows games to be played at the original "wrong" clock setting and the correct one, the clocking speed can be modified while a game is played on it. However, it comes in the form of a circuit board that people with "sufficient soldering experience" can make use of (and more so replacing the original board with it).So... thoughts?EDIT: Fixed link

author: BrokenYugo
author_rank: Super Contributor
timestamp: September 28, 2024, 05:01:48 pm
content: Bad link. Such mod boards almost always require soldering and alteration of the original PCB, just the nature of the beast.I looked into this a while back and figured if I got a SGB I'd get the first version (much cheaper) and fix the clock myself or with a kit.

author: Bryn
author_rank: Regular Contributor
timestamp: September 28, 2024, 05:51:57 pm
content: Quote from: BrokenYugo on September 28, 2024, 05:01:48 pmJust fixed it there... think I rushed it a bit when writing the post 😅
any good way to emulate fast NOR SPI/QPI /etc FLASH with SRAM ? - Page 1
Forum section: electronics / general

author: Hella_Wini22
author_rank: Contributor
timestamp: September 26, 2024, 06:53:48 pm
content: I'd like to play around with hardware that eitzher gets configured with ( FPGAs, FPGA SoCs etc) and/or execute code from such device (some microcontrollers, PC, CPUs etc).To do this I'd like to use SRAM. Up to some extent, I could use onboard SRAM on FPGA, but those are quite small.External DRAM is too slow latency-wise etc. Is there an obvious solution to this dilemma ? 🙄

author: Benta
author_rank: Super Contributor
timestamp: September 26, 2024, 09:05:56 pm
content: Serial SRAM?But you'll have to devise some kind of battery power to keep them active after programming.Or do in-circuit programming with power on.https://www.issi.com/US/product-serial-sram-and-serial-ram.shtml

author: tom66
author_rank: Super Contributor
timestamp: September 26, 2024, 09:22:14 pm
content: I'm pretty sure you could emulate SPI ROM with another FPGA - with the bitstream stored in some external SRAM. If you stick to SDR speed SPI flash (maybe 1-bit @ ~50MHz) then it would probably be a few hundred lines of Verilog to write a simple emulator.Some fast microcontrollers with DMA mightjustabout be able to do this as well.As for an actual product, I'm not aware of one.

author: Postal2
author_rank: Frequent Contributor
timestamp: September 26, 2024, 11:42:41 pm
content: Quote from: Hella_Wini22 on September 26, 2024, 06:53:48 pmFRAM.https://www.infineon.com/dgdl/Infineon-FM22L16_4_MBIT_(256K_X_16)_F-RAM-DataSheet-v09_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0ec87dbd40fchttps://www.farnell.com/datasheets/2309611.pdf
Drone that can go underwater - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: September 16, 2024, 08:49:44 pm
content: Cool...

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 16, 2024, 09:40:47 pm
content: Gee. All the complexity of a submarine and a quad copter in one compact package.Actually a pretty neat accomplishment, but not obvious what application makes this beneficial.

author: KE5FX
author_rank: Super Contributor
timestamp: September 16, 2024, 10:36:17 pm
content: Quote from: CatalinaWOW on September 16, 2024, 09:40:47 pm"The authors gratefully acknowledge support from Grant #XB48261-2190 from the Sinaloa Center for Marine Innovation"

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 17, 2024, 12:12:27 am
content: Yes, the obvious benefit is a grant.Drones are trendy, so that must be good investment.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 17, 2024, 04:07:58 am
content: Excellent joke. Those not living in NA may need some help.

author: Kim Christensen
author_rank: Super Contributor
timestamp: September 17, 2024, 04:17:02 am
content: It would be interesting to see how it transitions from water and back to air when there is any kind of wave action.

author: tom66
author_rank: Super Contributor
timestamp: September 17, 2024, 10:27:10 am
content: Pretty cool. My first drone was also able to go underwater but it wasn't so good at getting back out, or swimming, after that.

author: Bryn
author_rank: Regular Contributor
timestamp: September 18, 2024, 06:24:51 pm
content: Interesting concept... although it's evident that it doesn't move as well when submerged in the water compared to up in the sky. My question ishowdeep in the water it can go (like for underwater photography).

author: factory
author_rank: Super Contributor
timestamp: September 18, 2024, 07:56:46 pm
content: Just needs some way of automatically finding & landing in water, for those occasions when it overheats.David

author: EPAIII
author_rank: Super Contributor
timestamp: September 22, 2024, 07:53:18 am
content: Some folks who wear uniforms may find it interesting.Quote from: CatalinaWOW on September 16, 2024, 09:40:47 pm

author: RJSV
author_rank: Super Contributor
timestamp: September 23, 2024, 11:04:48 pm
content: At the risk of appearing 'too silly to blog'; I'm immediately thinking of HOLLYWOOD production...: Die Hard XXIV. 2024.The drone drawing machine gun fire, whilest Bruce grabs inflatable raft, and just mps off some object (50 meters down to water).Everything goes quiet, for a second, THEN drone emerges from water, next to bad guys boat, Bruce coming in for the 'Kill- Snark'.(Meaning some related pun, to insult the criminals, while they get blowed up.
Balzers PVD machines - Page 1
Forum section: electronics / general

author: bat
author_rank: Regular Contributor
timestamp: September 23, 2024, 11:56:53 am
content: Hi everyoneI was wondering if anybody here has experience using balzers PVD machines / has knowledge about them. I have 3 machines at my workplace, BA 510, BA 360 and BA 350. They are all very old machines that have been "retrofitted" over the years. It's very fascinating to work on those but at the same time it will pretty much give you a migraine when you try to figure out stuff especially if modifications weren't properly documented over the years...I would be interested to hear your experience / knowledge on the matter
Orbital SOLAR unit does A.I. heavy lifting - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: September 21, 2024, 04:43:23 pm
content: Microsoft folks have idea, and proceeding to negotiate use of Three Mile Island nuclear power, doing the heavier aspects of A.I.Wow, as an enterprise that's a surprise and brings up 'memories' of late 1970's emerging 'BIG'. As in having large, man-made events that have deep effects (or social after-effects).As an enterprise looking to expand A.I. markets could now start planning some similar motivated Space or Earth orbiting units that do the heavy portions of calculation loads, meanwhile communicating with Earth bound customers. It could be Solar, or even some nuclear power source.Interesting thing, the basic idea isn't new, having roots in Science Fiction, although there are modern takes, on suitability factors.'Nukes Bad', being the idea put forth during the 1979 risks from plant explosions, or container breaches. THAT mind-set got replaced, over the ensuing years, (by the Global Warming trend).I suppose part of whats got overlooked is the intense energy required, vs real or perceived advantages of using A.I. solutions.

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 21, 2024, 07:07:21 pm
content: Nice stuff.https://arstechnica.com/information-technology/2024/09/100-billion-ai-infrastructure-fund-launched-by-microsoft-blackrock-uae-firm/
This Electronic Design writeup of NI's mioDAQ is hilarious - Page 1
Forum section: electronics / general

author: CanuckEE
author_rank: Newbie
timestamp: September 19, 2024, 08:31:07 am
content: Apparently it's International Talk Like a Pirate Day and the editor somehow got this frikkin hilarious article past management on the new National Instruments data acquisition box - it's written in Pirate talk:https://www.electronicdesign.com/technologies/test-measurement/article/55140777/electronic-design-international-talk-like-a-pirate-day-starring-the-ni-miodaqThey may take it down, as they're a trade pub for professionals 😂

author: Simon
author_rank: Unknown
timestamp: September 19, 2024, 10:10:14 am
content: Moved to the right section and please don't post things more than once, people get upset, and the tell us about it, and we have to do something about it.
Friday 13th - resistor listed as USB device - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: September 13, 2024, 08:14:04 am
content: See the minimum needed for a USB device to list in Device ManagerTMwere driver?

author: ataradov
author_rank: Super Contributor
timestamp: September 13, 2024, 02:02:29 pm
content: This is not new. A pull-up resistor on a D+ or D- is how the host knows that anything at all was attached to the port.
USB C 6 Pin connector - Page 1
Forum section: electronics / general

author: MaurizioT
author_rank: Newbie
timestamp: September 12, 2024, 10:18:02 am
content: Hi!I need to use 6-pin USB Type-C female connectors to charge a lithium battery.I could get the 5V I need from VBUS and GND.I found the datasheet but I don't know how to connect CC1 and CC2.Do I leave them free?Thanks in advance to anyone who answers.

author: tszaboo
author_rank: Super Contributor
timestamp: September 12, 2024, 11:45:48 am
content: You connect a 5KOhm resistors between each those pins and ground. Two resistors in total. It could be 4.99K or 5.1K as well, 5K is nominal.

author: MaurizioT
author_rank: Newbie
timestamp: September 12, 2024, 12:31:55 pm
content: Perfect, thanks.
What early material looked like transparent plastic ?? - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: September 12, 2024, 09:32:22 pm
content: I just popped a movie on in the background, Wagon's East, it's a Western comedy set in the 1860's, so maybe this is a movie mistake.But Robert Picardo (the StarTrek:Voyager Doctor), is wearing what I call a visor-hat, IDK the real name. It has a greenish semi-transparent material, that now-a-days would be plastic. But I'm sure I've seen there old-style hats in other TV/movies. Sometimes you see bookies, and accountants wearing them in old gangster movies.So if they really had these see through visors in the 1860's, what the green material would be ? Besides glass, which seems a bit risky, maybe it could be some plant material, maybe died green. Or maybe even treated animal skin. I'm guessing it's not something like the mineral Mica.I can't take a screen shot of the hat as the movie is on amazon. But here's a modern one.

author: edavid
author_rank: Super Contributor
timestamp: September 12, 2024, 09:36:03 pm
content: Wikipedia says celluloid:https://en.wikipedia.org/wiki/Green_eyeshade

author: jpanhalt
author_rank: Super Contributor
timestamp: September 12, 2024, 09:40:33 pm
content: Probably celluloid, which dates to the mid 19th century. It is highly flammable and serious fires were attributed to its use for motion picture films much later:Source:https://www.britannica.com/technology/celluloidSome historians trace the invention of celluloid to English chemist Alexander Parkes, who in 1856 was granted the first of several patents on a plastic material that he called Parkesine.And:https://en.wikipedia.org/wiki/Green_eyeshadeEdit: Sorry, very slow typist.

author: MathWizard
author_rank: Super Contributor
timestamp: September 13, 2024, 11:12:12 pm
content: Ok it's green for making old artificial lighting less harsh. And yeah thinking of early chemistry, cellulose like from treating cotton for gunpowder and whatever, all that early organic chemistry explains it.So that must have seemed pretty futuristic. Maybe so did stained glass, but yeah something flexible, and then mass produced too.I love Back to the Future part 3 (sci-fi western), but I don't buy that Doc Brown couldn't make something like gas for the Delorean, or get the alcohol burning to working.

author: helius
author_rank: Super Contributor
timestamp: September 14, 2024, 02:21:19 am
content: Quote from: MathWizard on September 13, 2024, 11:12:12 pmTo avoid destroying a Daimler type engine, you don't need "somethinglikegas". You need a fuel with specific ignition characteristics within a narrow range. Kerosene, for instance, is definitelylikegasoline (a fractional distillate of petroleum), but filling your tank with it will not make you a happy camper. To avoid longer-term damage to valves and seals, the requirements are even more strict.
Nintendo Switch Lite logic board - Reverse Eng at the finest - Page 1
Forum section: electronics / general

author: Zucca
author_rank: Unknown
timestamp: September 09, 2024, 06:58:47 pm
content: https://usoldering.com/switch-lite/I post it even I am not sure it was already posted in this forum.It is just a monumental success and inspiration for all of us.top-sideandbottom-sidepanoramas from anywhereThis guy has steel balls and was born on micro soldering planet, such a boss!TLDRQuote

author: Ranayna
author_rank: Super Contributor
timestamp: September 10, 2024, 07:19:46 am
content: Oh god, at first glance i thought this picture was some kind of critter, or maybe mold.Incredible.

author: amyk
author_rank: Super Contributor
timestamp: September 12, 2024, 02:06:35 am
content: Many companies in China and Russia specialise in this type of work and could've probably given you the results for a bit less than $10k.
Eric Schmidt: steal peoples work using AI then hire lawyers to clean up. - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: September 08, 2024, 06:42:06 pm
content: Eric Schmidt’s recent Q&A at Stanford University.

author: Marco
author_rank: Super Contributor
timestamp: September 08, 2024, 08:03:45 pm
content: Has got little to do with oligarchs, just goes to show how rich people can get high on their own supply.The geriatrics in the supreme court are not trained animals who perform if you throw enough money at lawyers and congress will not ride to his rescue either if the courts don't rule his way. Billion dollar company CEOs are convinced they are right yet disastrously wrong all the time.
Offshore Flyback Transformer Manufacturer Recommendations - Page 1
Forum section: electronics / general

author: David
author_rank: Frequent Contributor
timestamp: September 07, 2024, 09:05:12 pm
content: Hi all,I am currently designing a Flyback Transformer for a client of mine. I am looking for recommendations for offshore manufacturers that can produce to my drawings, provide samples etc. Its been a long time since I did something similar and I've long lost the contacts I had.Cheers,Dave

author: fzabkar
author_rank: Super Contributor
timestamp: September 07, 2024, 10:00:45 pm
content: I don't know what they would charge ...https://hrdiemen.com/industry/engineering_and_services

author: Benta
author_rank: Super Contributor
timestamp: September 07, 2024, 11:55:57 pm
content: Offshore?
Source for notched clear mica insulators - Page 1
Forum section: electronics / general

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 06, 2024, 10:39:19 pm
content: Does anyone know where to purchase replacement mica insulators like these pictured (it looks like they originally came supplied with thermal paste on both sides).They have notches which locate them onto the clip that secures the component to the heatsink. There are at least 3 different sizes of insulator (3 different clip widths). Not an attachment style I've seen before.If I can't source the originals my plan was to buy a sheet of 0.1mm mica and cut my own using an xacto. Such as:https://www.mcmaster.com/8802K16I couldn't see sheets of mica on digikey/mouser but if anyone know a source please let me know. I don't want to use AliE as I'm worried about getting fake plastic sheet or similar.

author: Postal2
author_rank: Frequent Contributor
timestamp: September 06, 2024, 11:02:34 pm
content: Find some old mica capacitor and break it apart.

author: jpanhalt
author_rank: Super Contributor
timestamp: September 06, 2024, 11:44:26 pm
content: My first impression is that a shearing action would be better than a knife for shaping mica sheets. For the notches, look of what's called a nibbler. I have never tried an abrasive cutoff wheel, and that might also work.

author: thm_w
author_rank: Super Contributor
timestamp: September 07, 2024, 01:08:26 am
content: Is there a specific reason you can't use a silicone thermal pad?Mica is supposedly 0.6W/mK, you can get sil pads of better thermal transfer in similar thicknesses. But maybe double check the voltage withstanding capacity.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 07, 2024, 01:17:21 am
content: Quote from: jpanhalt on September 06, 2024, 11:44:26 pmFound this where it's cut using a Stanley/utility knife:.........Still be interested if anyone knows a source for exact replacement.

author: jpanhalt
author_rank: Super Contributor
timestamp: September 07, 2024, 09:12:18 am
content: Quote from: dorkshoei on September 07, 2024, 01:17:21 amUnlikely anyone can answer that as they seem to have been made for a particular purpose. The manufacturer of the device would be your best bet or its parts list, if available.EDIT: Mica can be cut. It can also be scored and broken like glass. Shearing will probably cause less delamination. As mentioned, I haven't tried abrasive cutting.

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 07, 2024, 09:31:53 am
content: Does it have to be the exact same shape?Mica sheets for TO packages with holes are available on digikey.https://www.digikey.com/en/products/filter/thermal/pads-sheets/218?s=N4IgjCBcoOwAxVAYygMwIYBsDOBTANCAPZQDaIAzDAKwBMAHAJwgC6hADgC5QgDKnAJwCWAOwDmIAL7SgA
What happens to inductor stored energy as saturation occurs? - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: September 06, 2024, 12:30:54 pm
content: Say we apply a DC voltage to an inductor and watch the current increase in a more or less linear manner. The stored energy also rises as time goes by. Then all of a sudden the inductor saturates and the inductance decreases so we take measures to cause the current to level off to a constant value. What happens to the energy that has been accumulating in the inductor? Seeing the inductance has dropped, it would appear the energy has disappeared somehow.

author: Siwastaja
author_rank: Super Contributor
timestamp: September 06, 2024, 01:20:18 pm
content: Think about saturation as inability to take in anyfurtherenergy, and dropping inductance (it's not like it suddenly drops to zero anyway) a consequence of this feature.

author: mawyatt
author_rank: Super Contributor
timestamp: September 06, 2024, 01:35:04 pm
content: As the effective inductance levels off due to saturation the stored energy also levels off, additional inductor current then produces heating. As a simple model of an ideal inductor Leff with a series resistance Reff, these both depend on the inductor current with Leff decreasing with applied current as saturation is approached, and Reff increasing as saturation is approached.Another way of thinking is the Inductor "Q" begins to decrease as saturation is approached, with "Q" as the inductors "ability" to store energy vs. energy dissipation, which is also a valid use of "Q" over the usual omega*L/R.Best,

author: coppice
author_rank: Super Contributor
timestamp: September 06, 2024, 01:39:15 pm
content: Quote from: Circlotron on September 06, 2024, 12:30:54 pmJust think of it like any other store that fills to overflowing. The content are still there. You just can't pack any more in. Stop trying to push more energy in, and what was stored starts flowing out.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 06, 2024, 03:37:56 pm
content: The formula of 1/2 L * I² is only valid for a constant inductance L. When going to saturation the old energy is still there in the magnetic field it is just the increasing the current even further will only add little more energy. Usually L does not go all the way to zero, but the air part still stay there.The power related to the current times voltage at the inductive part still gets stored.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 06, 2024, 05:09:19 pm
content: *Incremental* inductance drops. The average drops much slower; energy continues being stored, but at a slower rate for every increment of current (or in this case, faster by increment of flux..!).Tim
Wander to know the status of SmuView Project - Page 1
Forum section: electronics / general

author: BillyGo
author_rank: Contributor
timestamp: September 03, 2024, 02:24:41 am
content: I've recently started working on writing drivers for my LCRmeters to be used with the libsigrok framework. However, I noticed that the last continuous build of SmuView was over a year ago.https://github.com/knarfS/smuview/releases/tag/continuousI'm wondering if the SmuView project is still actively maintained or if it's been put on hold.
4000, 7400, 5400, 7300? series IC's - Page 1
Forum section: electronics / general

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: September 02, 2024, 10:42:55 pm
content: What was 7300 series and where to find info?JeffMore info:Some are newer than that book, PCF7325, and PCF7328 others were listed these are all Phillips/NPX.I assume the equipment was designed in the early 70's now.

author: fzabkar
author_rank: Super Contributor
timestamp: September 02, 2024, 11:19:16 pm
content: National Semiconductor had a DM9300 TTL series ...

author: Benta
author_rank: Super Contributor
timestamp: September 02, 2024, 11:44:58 pm
content: Never heard of 7300.

author: amyk
author_rank: Super Contributor
timestamp: September 03, 2024, 04:32:27 am
content: Do you have more info on where you heard about "7300 series"?My usual sources of information on old logic IC families yields no results.

author: ArdWar
author_rank: Frequent Contributor
timestamp: September 03, 2024, 04:58:14 am
content: Acording to 70s databook 5300s and 7300s are "Modified DTL" (in lieu of 5400 and 7400 being TTL?)The sequence aren't interchangeable. 7300 for example is a JKFF

author: fzabkar
author_rank: Super Contributor
timestamp: September 03, 2024, 08:21:36 am
content: https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/1967-68_TI_Integrated_Circuits.pdf

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: September 04, 2024, 07:42:35 pm
content: Thanks, now that I had a chance to look at my list instead of my memory 1 item was listed the 7331 no others so still looking for:NPX IC's datasheets PCF7317, 7319, 7325, 7328, and 7333 maybe replacements SN53xxJeff

author: amyk
author_rank: Super Contributor
timestamp: September 05, 2024, 01:52:44 am
content: I suspect you're looking at the wrong thing unless those ICs you refer to are from the late 60s. Philips/NXP PCF73xx are much newer proprietary ICs (seems mostly automotive-security related) and not simple logic blocks unlike the 7300 series that we did manage to find in this thread.

author: fzabkar
author_rank: Super Contributor
timestamp: September 05, 2024, 04:11:41 am
content: This datasheet suggests that the PCF73xx chips are the ROM versions of the PCF79xx E-ROM chips:https://media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/PCF7x41ATJ.pdf
Dick Smith Catalogue from 1993/1994 missing page 68 - Page 1
Forum section: electronics / general

author: numloxx
author_rank: Contributor
timestamp: August 28, 2024, 03:22:10 am
content: G'day all,I found copies of the 1993/1994 catalogues on archive.org (not sure if I am allowed to link them here or not).But both uploads are missing page 68.It's in the computer section and wondering what was on them. Or did page 68 really not exist?Cover page and pages 67 and 69 attached.

author: BrianHG
author_rank: Super Contributor
timestamp: August 28, 2024, 03:37:17 am
content: Maybe page 68 was a full page ad, so it was never scanned.

author: cunningfellow
author_rank: Regular Contributor
timestamp: September 02, 2024, 08:59:41 am
content: From my 4th year working part time at DSE

author: numloxx
author_rank: Contributor
timestamp: September 02, 2024, 09:16:03 am
content: Thank you!!!

author: cunningfellow
author_rank: Regular Contributor
timestamp: September 02, 2024, 10:15:08 am
content: do you need a high res scan of it - or just curious about what they where trying to hide from you ?

author: numloxx
author_rank: Contributor
timestamp: September 02, 2024, 12:21:07 pm
content: If you have a high res copy yeah.Just for personal use. Can ypur upload to archive.org be updated? Guessing it's yours?
Tek 545A scope and plugin have names instead of serial numbers? - Page 1
Forum section: electronics / general

author: mmurp
author_rank: Newbie
timestamp: August 31, 2024, 07:34:20 pm
content: Hi,I have obtained a 545A scope with a 1A2 plugin from my school's surplus property store. The scope is fully working which is cool but the serial for the scope is "BOB" (or maybe "B0B") and the serial for the plugin is "BOWER". I am curious as to what this means, but I can't find much information online and images of other 545A's have normal serial numbers. Is this normal for this era of scope?Also the 1A2 plugin is a bit odd because it has the markings for the trigger selector and a trigger out bnc, but the bnc is not hooked up to anything inside, and there is no trigger select knob nor internal hardware for that feature.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 31, 2024, 09:27:41 pm
content: Pretty neat. Never seen something like that myself.Maybe go check with the Tekscopes grouphttps://groups.io/g/TekScopes2/topics... and if there was a prof/TA named Bob Bower in that school. A quick googling shows a Robert Bower at Caltech who probably could have used a scope.
MickMake? - Page 1
Forum section: electronics / general

author: bwooce
author_rank: Newbie
timestamp: August 31, 2024, 12:12:49 pm
content: Where for art thou MickMake [Mick Hellstrom]? My selfish reason for asking is that GoSunGrow (https://github.com/MickMake/GoSungrow) the SunGrow homeassistant add-on he created is increasingly unstable.I don't want to fork it without discussing, but Mick's not been on the socials or Github for a while (Dec 2023), and I've tried a few different paths to contact him. I figure someone here might know enough to at least say if I should propose a fork.I wish him well wherever he is, and I'm not prying for gossip, so just a "go ahead" would be useful if someone here can tell me that.Thanks,Bruce

author: abeyer
author_rank: Frequent Contributor
timestamp: August 31, 2024, 08:42:04 pm
content: Quote from: bwooce on August 31, 2024, 12:12:49 pmOne of the nice things about github forks is that it's easy to upstream work later, if the maintainer wants to... I would say go for it either way.
Delayed notifications from security cams - Page 1
Forum section: electronics / general

author: ultrarunner2018
author_rank: Contributor
timestamp: August 31, 2024, 03:26:38 pm
content: I have two Eufy Solocam S220 - no base station required.Notifications on both Android and iOS phones are sometimes delayed by as long as a couple of minutes, and never immediate.I understand that these cameras must 'phone home' to the Eufy server, then send a notification through the cloud to reach the phone, but the delay has gotten to the point where the cameras are useless for motion detection.Do Ring cameras suffer from the same issue? Are there any cameras that work directly with local WiFi to an app on the phone?Would professional monitoring (ADP, etc) deliver motion notifications in a more timely manner?My main reason for having the cameras is to monitor an elderly person who lives in the home. I would like to know when she is going outside. It does no good if the notification comes minutes after she had fallen.Thanks for your helpEthan

author: Stray Electron
author_rank: Super Contributor
timestamp: August 31, 2024, 04:04:21 pm
content: I have a couple of wireless Eufy camera's installed and I've never noticed a delay of more than a FEW seconds before we are notified.YMMV.
AnandTech -- end of the road - Page 1
Forum section: electronics / general

author: fzabkar
author_rank: Super Contributor
timestamp: August 30, 2024, 06:10:04 pm
content: AnandTech is shutting down:https://www.anandtech.com/show/21542/end-of-the-road-an-anandtech-farewell

author: pbernardi
author_rank: Contributor
timestamp: August 30, 2024, 07:37:52 pm
content: Very Sad news.On a side note, this:Continuing the Fight Against the Cable TV-ification of the WebFinally, I’d like to end this piece with a comment on the Cable TV-ification of the web. A core belief that Anand and I have held dear for years, and is still on our About page to this day, is AnandTech’s rebuke of sensationalism, link baiting, and the path to shallow 10-o'clock-news reporting. It has been our mission over the past 27 years to inform and educate our readers by providing high-quality content – and while we’re no longer going to be able to fulfill that role, the need for quality, in-depth reporting has not changed. If anything, the need has increased as social media and changing advertising landscapes have made shallow, sensationalistic reporting all the more lucrative.I wonder how many good, serious media workers are losing space in the age of memes and cuts we have on Youtube and Twitter (not X, sorry). I just feel we have less and less good options to listen, and that big techsjust manipulates the ads industry in a way that only the funny, wrong and empty data is relevant.

author: fzabkar
author_rank: Super Contributor
timestamp: August 30, 2024, 08:00:39 pm
content: I was never a reader of AnandTech's blogs, except if I landed on one as a consequence of a search. However, this statement makes me wonder just how in tune with technology they really were:QuoteComputervision had a Graphics Processing Unit (GPU) way back in 1980:https://bitsavers.org/pdf/computervision/schematics/001-00532_GPU_GfxProcUnit_Jul80.pdf

author: thm_w
author_rank: Super Contributor
timestamp: August 30, 2024, 11:00:01 pm
content: Quote from: fzabkar on August 30, 2024, 08:00:39 pmCoin the term no, what he probably meant was claim and popularize the term.Quotehttps://www.computer.org/publications/tech-news/chasing-pixels/nvidias-geforce-256

author: tszaboo
author_rank: Super Contributor
timestamp: August 31, 2024, 08:34:00 am
content: Quote from: fzabkar on August 30, 2024, 08:00:39 pmThey were really top notch maybe 10-20 years ago. They had Ian Cutress working there, a semiconductor expert and insider, he was able to write long, detailed and precise CPU and GPU reviews.

author: iMo
author_rank: Super Contributor
timestamp: August 31, 2024, 09:15:51 am
content: Yep, their reviews around 2000 were perhaps the best one at that time..

author: brucehoult
author_rank: Super Contributor
timestamp: August 31, 2024, 09:28:47 am
content: Quote from: tszaboo on August 31, 2024, 08:34:00 amDid you know he has a PhD?
Palmgren 150 milling vise - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: August 30, 2024, 04:52:34 am
content: Hello, does anyone have a Palmgren 150 milling attachment vise? I have a little lathe machine. Thanks

author: EPAIII
author_rank: Super Contributor
timestamp: August 30, 2024, 09:04:31 am
content: Talk about it here:https://bbs.homeshopmachinist.net/forum/general
Samsung Galaxy: when the paint peels off - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: August 29, 2024, 11:39:22 am
content: ... you got the wrong charger:Third-party products causing paint to peel off Galaxy devices (https://www.samsung.com/ca/support/mobile-devices/third-party-products-causing-paint-to-peel-off-galaxy-devices/)A post on Reddit shows a typical case:Paint peeling on Fold 6 (https://www.reddit.com/r/GalaxyFold/comments/1f1ltot/paint_peeling_on_fold_6/)Seems that the current through the EMI suppression cap between primary and secondary of the SMPSU charger is sufficient to damage the case anodization when the user closes the loop to earth/ground.

author: tom66
author_rank: Super Contributor
timestamp: August 29, 2024, 11:47:23 am
content: Since third party chargers with different (not illegal) grounding arrangements will be used by customers, it seems like Samsung dropped the ball on this with inadequate testing. It's also possible to charge a phone from a laptop which might not be grounded, e.g. many Ultrabooks do not have grounded power supplies as their bricks are 30-40W max and it is cheaper/easier to pass EMC standards with a doubly insulated supply.

author: Gyro
author_rank: Super Contributor
timestamp: August 29, 2024, 12:39:02 pm
content: That's classy, Samsung!It sounds as if the as if the pores in the oxide coating haven't been sealed (normally done by immersing in boiling water for anodized Aluminium). I wonder if finger moisture and acids are forming a pseudo electrolytic capacitor with the surface. Odd that it would occur with AC leakage though, worst case (some sort of rectification taking place), the Y cap would charge up to peak mains and prevent further current flow(?)

author: thm_w
author_rank: Super Contributor
timestamp: August 29, 2024, 10:12:00 pm
content: I don't know if this makes sense:"When you are holding a phone that is being charged with a high-speed third-party charger that is not properly grounded, the leakage current can affect the anodisation (the process that gives a metal surface a decorative, durable, corrosion-resistant finish), which may slightly delaminate the paint."The paint is on top of the anodizing, it should be protecting it. I would expect it to be non-conductive.Someone in the comments said it happened in 10 days... seems far too short.
lorex nvr speaker and mike hookup - Page 1
Forum section: electronics / general

author: aleeeeaaa
author_rank: Newbie
timestamp: August 29, 2024, 12:06:20 pm
content: I have a Lorex NVR N861 series. On the back are two RCA jacks . The top one is labeled out and the bottom is labeded in. In the manual it shows a picture of speakers plugged into the out jack and a microphone plugged into the in jack. I tried hooking up two different self powered computer speakers to the out jack and got very low audio through the speakers with the volume turned up all the way. What i am trying to do is hear the sounds picked up from a selected camera and also being able to talk through a camera outside with a microphone from my nvr desk position. what do i need to get this going.

author: themadhippy
author_rank: Super Contributor
timestamp: August 29, 2024, 12:21:11 pm
content: what microphone are you using? does it require bias voltage? Also phono/rca connectors normally mean line level(apart from turntables) and so you mayt need a preamp between the mic and input

author: thm_w
author_rank: Super Contributor
timestamp: August 29, 2024, 09:58:28 pm
content: The microphone is integrated in their security camera, but yeah it might not be very good. Powered computer speakers have a pre-amp already.OP: check that the volume slider in the NVR software itself is maxed out, if you can find one.Speaking through the camera won't work unless it has a speaker in it, obviously. So make sure it does.Alternatively, can just buy an all in one option that supports two-way audio. Like reolink, ring, kasa, blink, etc.https://support.reolink.com/hc/en-us/articles/360003764334-Which-Reolink-Cameras-Support-Two-Way-Audio/
Anything interesting from C/2023 A3 (Tsuchinshan-Atlas)? - Page 1
Forum section: electronics / general

author: Rick Law
author_rank: Super Contributor
timestamp: August 29, 2024, 08:42:49 pm
content: This likely is a subject many techies would pay attention to.If you don't already know, comet C/2023 A3 (Tsuchinshan-Atlas) should be beginning to be visible in the Southern skies, but soon to be overwhelm the Sun light. How is the view from our fellow forum members down-under? and elsewhere?It is suppose to be one of the brighter comets. If it survives it's closest approach around the Sun without breaking up (September 27, 0.39AU at perihelion), we looking up the Northern Skies will get a shot at seeing it on it's way out.
HVAC BLower Motor Control Module - Page 1
Forum section: electronics / general

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: August 27, 2024, 10:00:51 pm
content: I have an older Carrier Infinity HVAC system. The thermostat communicates with the compressor and air handler on a simple digital network. The digital controller on the air handler then communicates with the blower motor controller to provide run signals and return some basic motor run status. I have had the motor control module go out a couple times, I think related to power droops and or lightning strikes. Fortunately, I have been able to diagnose the problem and get replacements off Ebay. The motor appears to be a 3-phase permanent magnet motor with no feedback, pictured below. Anyway my question, do any of you know the signaling to one of these? Based on the simplicity, just TX and RX to the motor controller, I'm guessing its just a PWM signal for three different speeds and a returned pulse train indicating activity. I could probably cobble up a break out connector and drag my scope under the house to check, but that would be messy.

author: ajb
author_rank: Super Contributor
timestamp: August 28, 2024, 03:09:41 pm
content: There are a couple of 'standard' control connectors/pinouts, but the motor control unit is typically lightly customized for the air handler manufacturer. It could have anything from one or more fixed speeds selected by on/off control lines all the way up to a full digital control interface. There may not actually be feedback from the motor control to the air handler control at all -- if the air handler is giving you some sort of error, it may be detecting a problem with the motor indirectly based on the state of the rest of the system.The motor manufacturer might have some documentation for their standard motor configurations, but it will be hard to know for sure if it matches your air handler's configuration without some reverse engineering. Examining the air handler control might be useful. There are some motors that can be configured in the field, used as generic replacements, once you know what kind of interface you need. Control voltages may be 24V or 240V, so be careful if you choose to probe at it.