hybridfree/eevblog-posts huggingface dataset:
Blown up but no soot - Page 1
Forum section: electronics / general

author: cybermaus
author_rank: Frequent Contributor
timestamp: December 10, 2022, 06:00:07 pm
content: This chip (switched PSU driver) clearly blew its lid, but no dirt or soot anywhere.Gives for a pretty neat image I thought.Anyone can ID the chip based on the die?

author: JacobPilsen
author_rank: Regular Contributor
timestamp: December 10, 2022, 07:03:28 pm
content: https://remont-aud.net/ic_power/

author: Zero999
author_rank: Super Contributor
timestamp: December 10, 2022, 07:16:10 pm
content: What's the make and model number? Perhaps someone might have the same one and can have a look a the IC.

author: DavidAlfa
author_rank: Super Contributor
timestamp: December 10, 2022, 11:50:00 pm
content: Not the TNY263-268 series, the pinout doesn't match...Somethign to start looking:https://www.mouser.com/c/semiconductors/power-management-ics/ac-dc-converters/?mounting%20style=SMD%2FSMT&package%20%2F%20case=SMD-8~~SMD-8C-7&rp=semiconductors%2Fpower-management-ics%2Fac-dc-converters%7C~Package%20%2F%20Case

author: amyk
author_rank: Super Contributor
timestamp: December 11, 2022, 07:07:09 am
content: You can clearly see the main power transistor is what blew in this one, and it takes up most of the die area.There's some text on the lower left of the die, if you have a more powerful microscope you may be able to see what it says.

author: cybermaus
author_rank: Frequent Contributor
timestamp: December 11, 2022, 08:18:42 am
content: To all helpers, I was somewhat jokingly asking about ID'ing the die.I posted truly because I thought it was rather neat and clean blowup.Did not expect people to actually try and ID.But now I went into the search myself (even though I already ordered a replacement)Its from a EU style combo boiler/heater unit. Honeywell DBM01And someone already had the same issue, and not only that,they claim these boards often fail because the chip is hooked up weirdlyThe chip is aFSD210

author: cybermaus
author_rank: Frequent Contributor
timestamp: December 14, 2022, 08:53:26 am
content: Just to complete the data:The replacement board came with aTNY274instead of FSD210which accoding to the datasheets is the upgraded version of theTNY268that above link advised as replacement
Prototype PSUs, Cases, & Cooling PC Parts (Cooler Master HQ) - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: December 14, 2022, 06:47:15 am
content: https://youtu.be/gmkft0h5nbgHeatpipes in a PSU, Novec cooling and heatpipe materials.
EVGA's Final GPU Secrets: Engineering Lab Tour ft. KINGPIN - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: December 14, 2022, 04:03:29 am
content: https://youtu.be/cr3lsU718LgAs someone myself who was in the OC world back in the 2004-2010, this is the dream I had back at the time.Vince was (and is) one of the behemoths back in the day, together with Hicookie and Elmor and some more.Also a mention to TiN, a member of the EEVBlog, mostly found in the Metrology section.Sad to see a change in EVGA business, although understandable how Nvidia always treated their partners:https://youtu.be/cV9QES-FUAMhttps://youtu.be/p-VCHOp9PKw
Positive Aliexpress experience - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 13, 2022, 05:26:28 pm
content: I ordered some ICs two weeks ago and today I got a refund because Aliexpress detected a fake tracking number.I've been burned in the past with fake tracking, this is a new system, at least to me. That's pretty cool.

author: floobydust
author_rank: Super Contributor
timestamp: December 13, 2022, 07:50:20 pm
content: What shipping/logistics method was supposed to be used?Cainiao Super EconomyCainiao Super Economy Global {no tracking}Cainiao Standard For Special GoodsCainiao Expedited EconomyAliExpress Premium ShippingAliExpress Standard ShippingAliexpress Selection Super Economy Global {no tracking}Aliexpress Selection StandardAliexpress Selection SaverAliExpress Saver ShippingHead spinning yet lol?

author: thm_w
author_rank: Super Contributor
timestamp: December 13, 2022, 09:47:01 pm
content: So you are saying it was fully automated? Interesting, still had to file a dispute a few weeks ago.Both Ebay and amazon don't care (automatically) if a fake tracking number is supplied.

author: DavidAlfa
author_rank: Super Contributor
timestamp: December 13, 2022, 11:30:39 pm
content: Probably they only sent once and re-used the same number for several customers, easy to detect.When you're really screwed up is when your packet arrives with wrong contents or is delivered somewhere else.Happened twice already, I got some random contents (Pokemon cards, fake tatoos, cheap jewerelly, did I become 13 again? Crap, nope!).Tge envelopes are usually relabeled after customs, and I noticed there was a different address in the old sticker, yet It took several messages and a lot of arguing.The next time it was harder, the old stickers had been removed, leaving only a partial phone number and a ZIP code, and a large "Returned" red stamp.That one took almost two weeks! The sellers said they didn't use that packaging, so there must had been other mistake in the chain.After a lot of trumouble, sellers panicking sending me messages to cancel the case, I finally got everything back.Althought I think AliExpress made them pay for it anyways, seems a platform that threat sellers like slaves, even if it's their fault!Otherwise, else than skyrocketing prices, useless search engine (Will show what it wants you to view) and lots of crappy products, it's pretty good.
75th Anniversary of the Transistor - Page 1
Forum section: electronics / general

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: December 16, 2022, 06:55:15 pm
content: On December 16th, 1947 John Bardeen and Walter Brattain first achieved the transistor effect in a point-contact germanium device at Bell Labs, starting a revolution in semiconductors that continues to this day.https://eds.ieee.org/about-eds/75th-anniversary-of-the-transistor

author: Gyro
author_rank: Super Contributor
timestamp: December 16, 2022, 08:44:26 pm
content: QuoteOr was it Julius Edgar Lilienfeld, who patented the FET on October 22, 1925?

author: jpanhalt
author_rank: Super Contributor
timestamp: December 16, 2022, 09:02:40 pm
content: I wasn't quite in on the inception, but as a 9 year old, I got into RC model airplanes. I used a kit for the transmitter and was clueless. A lot later (1957), I was playing with electronics per se. This is one of my first booklets on that subject (1957):I built a PCB with a flip-flop. My mom wasn't impressed.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 16, 2022, 09:53:42 pm
content: And here I am only getting up to speed on diodes.

author: rsjsouza
author_rank: Super Contributor
timestamp: December 16, 2022, 10:14:54 pm
content: Quote from: Gyro on December 16, 2022, 08:44:26 pmWell, Julius' work helped pave the way to the first practical transistor but he did not really build one. That said, IMO he should have been acknowledged by the Nobel prize organization, but their decisions can be a mystery sometimes...
LTT Tours Micron R&D fab house.  (Big $ toys) - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: December 11, 2022, 11:49:00 pm
content: Enjoy a look at the latest EUV fab and testing toys...)Also, notice how a super polished flattened silicon IC wafer curls like a poster. IE: a single layer in a multi-layered 3D stacked chips.

author: eti
author_rank: Super Contributor
timestamp: December 12, 2022, 04:48:02 am
content: I can’t help thinking that someone more knowledgable about the physics, processes and the terminology used in these fabs, would be a better host for a tour. He’s a PC part plugger.Please ignore my ignorant unkind comment. This video is amazing. Well done Linus.

author: BrianHG
author_rank: Super Contributor
timestamp: December 12, 2022, 05:53:01 am
content: This is marketing for Micron. They would never waste their time with any electronics physicists web channel. Trust me, Micron knows what they are doing.

author: Jackster
author_rank: Frequent Contributor
timestamp: December 12, 2022, 06:09:50 am
content: Nice to have it dumbed down for us simpletons. Not everyone wants to watch a documentary...Actually pretty cool to see inside their space. Would have liked to have seen more in how they package the does though.

author: eti
author_rank: Super Contributor
timestamp: December 12, 2022, 08:32:25 am
content: Quote from: Jackster on December 12, 2022, 06:09:50 amI was talking complete garbage. I take back what I said; this video is amazing.

author: thm_w
author_rank: Super Contributor
timestamp: December 13, 2022, 01:41:06 am
content: That AOI is cool (17:00).Quote from: Jackster on December 12, 2022, 06:09:50 amYeah, I mean for normal single layer chips I think its fairly standard, but these stacked thin chips.. must be complex procedure. Maybe some sort of heat press.https://www.electronicproducts.com/10-basic-advanced-ic-packaging-terms-to-know/https://www.youtube.com/watch?v=iO64ssRXSkg

author: BrianHG
author_rank: Super Contributor
timestamp: December 13, 2022, 03:34:47 am
content: @8:50, I just cant believe that a silicon wafer of ICs becomes that flexible after being shaved flat. It's like a roll of film.Explanation begins at 8:00...
Book recommendations for the holidays? - Page 1
Forum section: electronics / general

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: December 10, 2022, 12:09:19 pm
content: Hey folks,With some time off coming up during the holidays, and projects stalled due to missing parts, I want to hear your recommendations for electronics related books. Anything around history, personalities, biographies, anything except pure text books. Something that you would read for pleasure rather than knowledge.Cheers!

author: jasonRF
author_rank: Regular Contributor
timestamp: December 10, 2022, 06:09:19 pm
content: As a fan of electromagnetic theory, I really enjoyedFaraday, Maxwell and the electromagnetic fieldby Nancy Forbes and Basil MahonThe Maxwelliansby Bruce HuntOliver Heaviside2nd edition by Paul NahinThe last one is a little harder to read than the others. Paul Nahin is a retired EE professor, and I have enjoyed several of his books, although they mostly are not about electronics.jason

author: jonpaul
author_rank: Super Contributor
timestamp: December 10, 2022, 06:57:54 pm
content: Wow, great idea,Inventors, Scientist and engineers biographieTesla, Edison, Steinmetz, ShannonNuclear...Teller, Fermi, Curie, Lawrence, OppenheimerStory of the great electronics industry giants, Hewlett Packard, Tektronix, Bell Laboratoires, AppleDavid Kahn's landmark 1967 "the Codebreakers"just a start!Jon

author: Benta
author_rank: Super Contributor
timestamp: December 10, 2022, 08:21:29 pm
content: "KELLY: More than my share of it all"Clarence L. "Kelly" Johnson with Maggie Smith.Autobiography by the former boss of the legendary Lockheed "Skunk Works". Somewhat anecdotal and self-centered, but with a lot of technical (and political) stuff.A good read.

author: MikeK
author_rank: Super Contributor
timestamp: December 10, 2022, 09:28:01 pm
content: "The Soul of a New Machine" by Tracy Kidder. It's about computers, but a good read.From wiki:Quote

author: RoGeorge
author_rank: Super Contributor
timestamp: December 12, 2022, 08:44:44 am
content: You may enjoy reading this chapter:Chapter 1 - A microhistory of microwave technologyhttps://assets.cambridge.org/052183/5267/sample/0521835267ws.pdffrom the bookPlanar Microwave Engineering by Thomas H. LeeIt's a free sample and the opening chapter of the book. The book is very good, though the rest of it is mostly a microwave textbook.

author: rdl
author_rank: Super Contributor
timestamp: December 12, 2022, 09:32:35 am
content: I got "The Soul of a New Machine" for Christmas one year. I started reading it the morning of New Year's Day and basically couldn't put it down until finished. Another book that did that to me was "Angle of Attack" by Mike Gray. It tells the story of Harrison Storms, North American Aviation, and the Apollo program. It's absolutely a must read if you are at all a fan of space exploration and/or the Apollo program.
Exploring a 1 MILLION Watt FM Tower - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: December 10, 2022, 09:35:27 pm
content: This thread is a repeat... See here:https://www.eevblog.com/forum/rf-microwave/inside-a-megawatt-fm-transmission-tower-and-control-room/
Check Correct Polarity of Wires on Internal PC Speaker - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: December 10, 2022, 08:43:49 am
content: Hello,Red is supposed to be positive while black is negative. If polarity is reversed will it damage motherboard?I still want to check that polarity is correct and wanted to know if it is possible to do with multimeter but without powering speaker. If not then is there a way to power it with AA or AAA battery to check?Thanks

author: mariush
author_rank: Super Contributor
timestamp: December 10, 2022, 08:50:18 am
content: You will not damage the motherboard inserting it the wrong way.Same applies for LEDs - you won't damage the motherboard and you won't damage the LEDs because the voltage and current "sent" to the leds is too low.You can figure the polarity with a multimeter ... put the meter in voltage mode, connect to the two wires and gently press with the eraser tip of a crayon on the piezo element inside.If the wires are connected to the multimeter correctly (positive to red probe , negative on black) you would see a very brief voltage rise on the multimeter. If it's wrong way you'd see negative voltage on multimeter.

author: amyk
author_rank: Super Contributor
timestamp: December 10, 2022, 09:16:45 am
content: PC internal speakers are mono and not hi-fi, so polarity doesn't matter.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: December 10, 2022, 09:20:20 am
content: Quote from: mariush on December 10, 2022, 08:50:18 amI don't have piezo element at home.

author: tooki
author_rank: Super Contributor
timestamp: December 10, 2022, 11:12:44 am
content: Quote from: mariush on December 10, 2022, 08:50:18 amFYI, I think you mean “…of a pencil”, since it’s (graphite) pencils that often have an eraser on the end. The English word “crayon” means the colored wax rods mostly used by children. (Unlike the French word “crayon”, which means “pencil” in English.)

author: pcprogrammer
author_rank: Super Contributor
timestamp: December 10, 2022, 11:34:52 am
content: Quote from: amyk on December 10, 2022, 09:16:45 amTrue for old style speakers with a coil, but those piezo speakers (buzzers) can be polarized and then it does matter. In most cases the piezo will have markings to show this, like a plus sign near the pin.

author: wraper
author_rank: Unknown
timestamp: December 10, 2022, 11:42:00 am
content: Quote from: pcprogrammer on December 10, 2022, 11:34:52 amPolarity matters only for buzzers containing electronics. PC buzzers are just a coil. Piezo buzzers do not care about polarity as long as do not contain electronics. Computers are not compatible with buzzers which contain electronics and generate tone by themselves.
Videos, about the UKs early [Ferranti] BJTs/IC industry 60s/70s, & its collapse - Page 1
Forum section: electronics / general

author: MK14
author_rank: Super Contributor
timestamp: December 08, 2022, 12:10:52 am
content: Ferranti: Videos, about the UKs (Manchester etc) early BJTs/IC industry, and its collapse.I've enjoyed watching the first video, which I wonder, is maybe really from the late 1960s perhaps?I've not watched the others yet.The first video, is a nice (I found it very interesting) introduction/documentary, about how early integrated circuits were designed, turned into masks, and then produced. The packaging techniques, are also carefully explained and shown.It even goes into the various extensive testing, at different stages. Sometimes using computers of the time.All I need now is a time machine, and an invitation to visit that site, while it was operational. Lots of Gold, shown in the video(s). It was probably considerably cheaper, then.Warning, next one in German:The end of Ferranti:

author: eti
author_rank: Super Contributor
timestamp: December 08, 2022, 01:07:34 am
content: One of my Dad’s friends sold their company to Ferranti, years ago. I know little about them (is this the same Ferranti?)

author: MK14
author_rank: Super Contributor
timestamp: December 08, 2022, 01:10:38 am
content: Quote from: eti on December 08, 2022, 01:07:34 amCan you say roughly what year, the company was sold and confirm it was an electronics/semiconductors/computers type of organisation?I think, up to around 1993, it could be the same company.
My 5Ghz Wifi can haz issues - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 05, 2022, 10:46:51 pm
content: Your cat: “He won’t see me down here in this mess, he never looks down here” 😁

author: Halcyon
author_rank: Unknown
timestamp: December 06, 2022, 03:18:14 am
content: Your heat sink is a bit furry.

author: trophosphere
author_rank: Frequent Contributor
timestamp: December 06, 2022, 03:38:28 am
content: Should probably ask Shahriar from The Signal Path. I heard he has plenty of experience with these kinds of scenarios.
TDA1517 vs CA810 RCA for Daughter - Page 1
Forum section: electronics / general

author: vidarr
author_rank: Frequent Contributor
timestamp: December 03, 2022, 04:08:21 pm
content: I am making a simple amplifier and speakers for my 1.5 year old daughter (for books on tape) and I have these two options for amp chips to use.The TDA1517 I built the circuit for and know what it sounds like. It was OK. I never heard the CA810 RCA before.The circuits I build will be from the datasheets.All things being equal, anyone have an opinion about which will have a better sound? All opinions welcome.Thanks.

author: mariush
author_rank: Super Contributor
timestamp: December 03, 2022, 05:16:49 pm
content: tda1517 is stereo , ca810 is monotda1517 is easier to heatsink and power directly from 9v or 12v adapter and has better documentation (datasheet)Would be easier to just get some cheap computer speakers from a store. by the time you get some power adapter / transformer, speakers, make boxes ... you'll spend more than what some cheap computer speakers cost in the store.

author: vidarr
author_rank: Frequent Contributor
timestamp: December 03, 2022, 07:34:47 pm
content: I already have all the parts, like totally everything, just not the built amp (circuit). I have two of the ca810 to make it stereo.Agreed that the tda1517 is simpler, plus I already built that circuit before. I think you are right about this. Plus, the sound quality was pretty good/OK.Thank you for your input!

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 03, 2022, 09:00:42 pm
content: Consider a cheap PAM8403 board if you want something that's battery and/or USB powered.

author: vidarr
author_rank: Frequent Contributor
timestamp: December 05, 2022, 05:11:54 pm
content: Wow! that is such a tiny and simple circuit. I could probably add bluetooth easily too. Thanks for that!BTC is also not "cryptocurrency". So many people are confused and misled. It is foolish not to buy at least a few bucks of BTC, especially right now. It may go a bit lower, but half the world is switching to BTC as we speak/type. The "Global South" has billions of people and their countries are all (or, almost all) embracing BTC. This is huge.HODL ON!
Tour AM Stereo Radio Station Transmitter - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 04, 2022, 11:12:25 pm
content: Interesting tour of equipment and functioning of an AM stereo radio station.From Shango066https://www.youtube.com/user/shango066/videosMostly tube era repair videos.

author: Homer J Simpson
author_rank: Super Contributor
timestamp: December 05, 2022, 02:46:49 pm
content: Here is a follow up repair video on the portable AM stereo radio.
Telephone espionage: “infinity transmitter” - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 05, 2022, 07:31:50 am
content: Have you heard of those?I used to make phone taps, fm telephone bugs and beige boxes (before the internet and it’s “let me show you how to X” mindset - it’s all incredibly simple and is logical profession when you have to work things out; that’s what develops one’s mind!) back in the 90s.Also I looked into “infinity transmitters”. A chap here in England used to make an INCREDIBLY impressive range of these - minuscule black blocks which had all the clever stuff potted inside, brought out onto 2 turned gold pin sockets which were sitting flush with the surface of the carefully sanded flat black potting compound. The construction alone was a work of art. I wish I could remember his name.I’d call him at home (we never met) and he’d tell me the DTMF code he’d set into the demo unit; he’d tell me he was going to hang up and that I should wait X seconds and then enter the code, which I did, and I’d then hear VERY amplified room audio from his end.Google ”Infinity transmitter” - but I’d caution against using one!!

author: SeanB
author_rank: Super Contributor
timestamp: December 05, 2022, 09:05:04 am
content: I know that, when the old phones used potted modules for the electronics, there were a good number of those that were made to look alike to the original GPO potted blocks, to be installed in the phones servicing certain locations. Identical box and potting (of course, seeing as the builders had the way to get the right potting boxes, potting compound, silkscreen prints and wires in the potting), and often the only way to tell would be an extra wire to connect the other end of the hook switch, nominally there as "contact interference suppressor" connection.Of course when installed the lines also were monitored...... But this allowed the room to be listened to as well.
How about a nice 1979 industrial film about bubble memory? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 04, 2022, 11:27:37 pm
content: Seemed nice to me.https://youtu.be/iEub5U9UeX8

author: ebastler
author_rank: Super Contributor
timestamp: December 04, 2022, 11:41:56 pm
content: That gap mentioned in the video -- between cheap-but-slow mechanical magnetic memory, and fast-but-expensive solid-state RAM and PROM memory -- closed pretty quickly without bubble memory's help though...
Insane!! And so much fun!! - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 02, 2022, 12:21:21 am
content: Pardon the excessive abuse of punctuation “!!” but I feel this insanity deserves it. I don’t mean “insanity” as in bad or stupid; au contraire, this is SO MUCH FUN. Yep,Kevin is bit of a loonie but this is worth watching in my humble opinion:

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: December 02, 2022, 05:09:22 am
content: "Today I woke up, went to the bathroom, and got out of bed"He's far too young to have those sorts of issues!

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: December 02, 2022, 05:18:16 am
content: 5m21sAfter hitting the door and the palm trunks the rocket leaves the area quite rapidly at about 90 degrees to its original trajectory.That's a NOPE from me.

author: eti
author_rank: Super Contributor
timestamp: December 03, 2022, 12:46:29 am
content: Quote from: Geoff-AU on December 02, 2022, 05:09:22 am🤣 Yeah, I did wonder if he’d made a Sleudian Frip.

author: MrMobodies
author_rank: Super Contributor
timestamp: December 03, 2022, 01:20:24 am
content: What a nice firework rocket show.I like this one at 9:11 in the video:At 9:24 in video very powerful how it penetrated and split that LCD TV apart instead of blowing it out of the way.11:54 It put a massive big hole in a fridge, blew the door off and it blew up.

author: KE5FX
author_rank: Super Contributor
timestamp: December 03, 2022, 01:26:12 am
content: I don't get why he didn't just mount the knives to the base of the rocket and use them as fins. It's not as if it would have made any difference where the knives were located.I guess launching it horizontally would still require either spin or gyro stabilization or a big trailing stick.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 03, 2022, 09:25:08 pm
content: Doesn't seem dangerous at all.

author: PlainName
author_rank: Super Contributor
timestamp: December 03, 2022, 09:45:42 pm
content: Quote from: Geoff-AU on December 02, 2022, 05:18:16 amHe did say there's nothing for several miles behind there.

author: DavidAlfa
author_rank: Super Contributor
timestamp: December 03, 2022, 10:14:40 pm
content: So all I need to do is to melt down some *ROCKET FUEL* and put some *ROCKET FUEL* into the rocket.I hope buying 500lb of sugar / KNO3 won't trigger any alarms.And now we can blame the russians for anything, it's too easy!* Yes, sir, some crazy russian pointed me with a gun, filled my bathtub with explosives and started stirring with a wooden spoon for 2 days *Reminds me to my experiments when I was younger. But I'm still young enough!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 04, 2022, 04:58:18 am
content: Quote from: SiliconWizard on December 03, 2022, 09:25:08 pmYou must be new [to TheBackyardScientist] here.Tim

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: December 04, 2022, 09:38:58 am
content: Quote from: PlainName on December 03, 2022, 09:45:42 pmYeah I know, but he didn't say there's nothing for several miles to the side...
Minimum operating voltage for the LT1037? - Page 1
Forum section: electronics / general

author: gamalot
author_rank: Super Contributor
timestamp: December 03, 2022, 03:34:23 pm
content: It is easy to find that the limit of working voltage is ±22V, so what is the minimum working voltage?I think I read the datasheet carefully, is it my presbyopia?---It works fine in LTSpice down to ±2.5V, but I'd still like to find information in an official document.https://www.analog.com/media/en/technical-documentation/data-sheets/lt1007-lt1037.pdf

author: tooki
author_rank: Super Contributor
timestamp: December 03, 2022, 04:38:14 pm
content: They don’t list it as a number in a list. But various of the specs are given at different supply voltages (like PSRR on page 3: “VS = ±4.5V to ±18V”), and the curves on pages 5 and 6 that plot various things against the supply voltage. It’s no accident that those curves don’t extend to zero: they’re telling you that no performance is specified at those very low voltages. (Which means they aren’t guaranteed to work there.)

author: gamalot
author_rank: Super Contributor
timestamp: December 03, 2022, 04:49:11 pm
content: Quote from: tooki on December 03, 2022, 04:38:14 pmMaybe back then people were not particularly concerned about low voltage performance, in their modern devices (such as the famous LTC2057) the data sheet clearly lists the minimum operating voltage.

author: magic
author_rank: Super Contributor
timestamp: December 03, 2022, 05:05:43 pm
content: This chip is 40 years old or something like that, and it surely doesn't look like it was designed for 5V operation, let alone 3.3VSearch the datasheet for "Vs" or "supply" and you will get some idea of what they guarantee (not a lot) and what they declare about typical performance (a little more).Most importantly, they show common mode input range for supply voltages of ±3V or higher - basically you need to stay 3V away from each supply rail to expect good operation at all temperatures.They also show gradual loss of DC gain at less than ±10V supply. CMRR and PSRR may decrease by a similar ratio, but those are not shown.
Part ID - Page 1
Forum section: electronics / general

author: Miti
author_rank: Super Contributor
timestamp: December 02, 2022, 10:04:27 pm
content: Does anyone know what this part is? Looks like an 8-UDFN-EP 2x3 mm.Thanks,Miti

author: amyk
author_rank: Super Contributor
timestamp: December 03, 2022, 01:37:30 am
content: 24LC64-I/MC

author: Miti
author_rank: Super Contributor
timestamp: December 03, 2022, 12:14:40 pm
content: Quote from: amyk on December 03, 2022, 01:37:30 amCheers amyk!Miti
Wetting current for large 15A switch - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: December 14, 2022, 12:35:12 pm
content: What is a good rule of thumb for switch wetting current for a large 15A switch with 5V logic into a MCU ?(assuming the datasheet does not give wetting current and the choice of switch is out of your control)I don't have a link to the exact switch, but it's this sort of style and size.https://www.digikey.co.nz/en/products/detail/adam-tech/SW-T1-3A-B-K2/15284401I was thinking perhaps having the switch short a 10uF ceramic capacitor through a resistor to ensure there is always a burst of higher current.But I'm not sure if I'm overthinking things, maybe all I need is a 220R pullup?

author: floobydust
author_rank: Super Contributor
timestamp: December 14, 2022, 08:31:12 pm
content: It kind of depends on the switch, the contact wiping action and their alloys, sealed or not etc. High current switches don't work well at low currents, the contacts oxidize more than signal kind of switches.I would say you need enough current and voltage to cut through any passivation layer.Automotive digital input IC's i.e.MC33975have programmable wetting currents 2,4,16 up to 32mA but I think this pullup value is for powering some sensors. I've seen 12V/100Ω used on windshield wiper motor switches and ign. points for ~120mA which seems huge.If you can afford (power budget) it several mA does it. Normally you'd have a cap say 4.7-33nF across the contacts for ESD/RF which has a tiny bite for the switch. I don't like really high discharge currents on small switches. So I use 0.1uF series with 100Ω at 5V and seems to work for me.
Fake THT BS170 with reversed pinout are about - Page 1
Forum section: electronics / general

author: cybermaus
author_rank: Frequent Contributor
timestamp: November 29, 2022, 08:40:14 am
content: Yes, I know. Should have known better then to buy on Ali. No-one is informed or helped by me posting about it.Just writing away the frustration of spending all evening troubleshooting the freshly build pcb.They probably accidentally labelled a bunch of 2n7000 as BS170 and are still making them into money rather then binning them.Now, do I bin them, or use them and run afoul of them in the future when I forget.Seems like an obvious choice, but I am very frugal.

author: brabus
author_rank: Frequent Contributor
timestamp: November 29, 2022, 08:44:54 am
content: Widlarizethem.

author: magic
author_rank: Super Contributor
timestamp: November 29, 2022, 08:51:13 am
content: I doubt it was accidentalIt is evident that in China, the companies packaging those transistors or ICs will print anything you want on them, no questions asked. And the fraudsters who order such custom parts just don't give a fuck about compatibility. Maybe some of them aren't even knowledgeable enough to understand the difference.Document the problem on Ali, request a refund, move on.

author: thm_w
author_rank: Super Contributor
timestamp: November 29, 2022, 09:54:58 pm
content: Whats special about BS170?Any reason you aren't using something more common?I assume its the through hole part, as the SOT-23 parts have the same pinout. And you can get those from LCSC for 5c:https://lcsc.com/product-detail/MOSFETs_UMW-Youtai-Semiconductor-Co-Ltd-BS170FTA_C5236685.html

author: cybermaus
author_rank: Frequent Contributor
timestamp: November 30, 2022, 05:01:25 pm
content: More standard? Than a BS170?There is nothing special about the BS170. Afaik it is one of the more normal and common general purpose THT FET'sNow, I do not claim to know what really is standard. Afterall, I am still messing with THT. But what do you consider a standard low power signal level FET?

author: thm_w
author_rank: Super Contributor
timestamp: November 30, 2022, 10:44:13 pm
content: Quote from: cybermaus on November 30, 2022, 05:01:25 pmThe 2N7000 (200mA) or 2N7002 (115mA) that you mentioned, 4c each from LCSC.But yeah you are right, seems quite common part, just had not used it before. Annoying that one of them went with a different pinout.
HGST drive, model HTS541010A9E680 - no reaction - Page 1
Forum section: electronics / general

author: Jane
author_rank: Frequent Contributor
timestamp: December 05, 2022, 09:18:41 pm
content: Anyone here tried to repair a logic board of this harddrive(picture enclosed )?I also enclosed a picture of the board that is faulty - harddrive has no reaction.There are some ICs (e.g. TLS2601 and 88i9305-TLA2) but I could not find datasheet.Are there datasheets for TLS2601 and 88i9305-TLA2 available?

author: magic
author_rank: Super Contributor
timestamp: December 05, 2022, 11:12:22 pm
content: If you are lucky, it could be some stupid protection diode or fuse near the power connector.Check if voltage rails are OK if you haven't already.

author: Jane
author_rank: Frequent Contributor
timestamp: December 06, 2022, 08:23:59 am
content: The fuse and diodes are OK
Operating and service manual HP 5210A frequency meter - Page 1
Forum section: electronics / general

author: PvdT
author_rank: Newbie
timestamp: November 15, 2022, 12:56:12 pm
content: Hello,Does anyone has the operating and service manual in PDF format of the HP 5210A frequency meter?Cheers, Peter

author: langlv
author_rank: Contributor
timestamp: November 30, 2022, 12:37:21 pm
content: Hello Peter,You can get it directly from Keysight. Not so good quality, but at least better than nothing.https://www.keysight.com/us/en/assets/9018-02996/user-manuals/9018-02996.pdfHere attached a nice application note.BRLang
Why do 74-series counters label their enable pins T and P? - Page 1
Forum section: electronics / general

author: JetForMe
author_rank: Contributor
timestamp: December 05, 2022, 12:14:56 am
content: I posed this question toStackExchange, but figured I'd ask here, too.There are a couple of answers, but they’re not quite complete, I think:A few 74-series counter ICs I’ve looked at have two enable pins, and they’re labeled “T” and “P” (for example, the[color=var(--theme-link-color-visited)]74LS161A, or[color=var(--theme-link-color-visited)]74ALS867A). The “T” input affects the ripple carry out, and the data sheets say this pins are used to enable cascading ICs, but they’re not precise about how to connect them.After some experimentation, I tied the ENT pins together to use as a global enable, and tied the RCO of the lower stage to the ENP input of the upper stage:This behaves as expected, but what do “T” and “P” stand for?

author: Benta
author_rank: Super Contributor
timestamp: December 05, 2022, 01:36:14 am
content: Wow, totally obsolete parts. Nostalgia.But anyway: ENP/CEP or ENT/CET: no one knows how names come into being. I agree they are not logical.Functionally, they do make a difference in longer (12+ bits), high-speed counters.

author: Andy Watson
author_rank: Super Contributor
timestamp: December 05, 2022, 01:57:56 am
content: Can't you acccept that they just ARE - it's the way of the world, etc..Ok, this is really a guess, but:ENP enables the clockPulse to the chain of flip-flops. ENT enables the ripple carry forward (RCO) - so it enables the next cahin of flip-flops toToggle.

author: Swainster
author_rank: Frequent Contributor
timestamp: December 05, 2022, 02:04:42 am
content: ENable Parallel and ENable Trickle (but they are interchangeable). As Andy Watson says, its for chaining/cascading of multiple counters, although in this case they are synchronous rather than ripple counters. One enable goes to the previous counter, the other is for parallel load.

author: pgo
author_rank: Regular Contributor
timestamp: December 05, 2022, 07:40:55 am
content: enable_p and enable_t are NOT interchangeable.As pointed out above they are for parallel and trickle enables.All the parallel enables are usually connected together to enable/disable all the counters.The enable_T is used to form a combined parallel/serial* carry chain to enable the counters to be cascaded (as shown in the circuit given earlier).Note the different wiring to the ripple out in the circuit below.* Within the counter IC the carry is parallel with ripple between each stage.

author: Swainster
author_rank: Frequent Contributor
timestamp: December 05, 2022, 03:15:22 pm
content: Actually, come to think of it, that makes a lot more sense, otherwise they wouldn't have given them different letter suffixes. I stand corrected!
Tis the season to be scammed - Page 1
Forum section: electronics / general

author: CNe7532294
author_rank: Regular Contributor
timestamp: November 30, 2022, 09:27:21 am
content: Been going on for years but I figured its time to raise awareness. Whether you're buying Nvidia cards with this Crypto winter or test equipment to sate an addiction.I didn't know where to put this and felt this should reach a vast audience. I apologize, its been a long while since I posted. Times have changed. Mods feel free to move if appropriate. Anyone else is free to post other scams.
Outdoor enclosure for miniature solar panels - Page 1
Forum section: electronics / general

author: mvno_subscriber
author_rank: Regular Contributor
timestamp: October 11, 2022, 06:54:35 am
content: Hi,I wasn't sure in which subforum to put this post, so if terribly misplaced -- apologies in advance!I have been trying for some time to find an outdoor enclosure for 10x10cm solar panels that I use for different hobby projects. Something that can contain the cell, keeps water away, can be mounted and has cables going out of it.I'd assume this was a very simple item to find, but I suspect (as with many other items), knowing the right terminology is key here. To myself I seem to have exhausted all options, without results. So I'm asking here.Can anyone point me in the right direction?

author: josuah
author_rank: Regular Contributor
timestamp: November 27, 2022, 01:10:13 am
content: I wonder whether you found something by the time.What about "waterproof DIY enclosure" as a search term? The use-case for custom outdoor electronic device exist.Another helpful keyword is the IP-rating you expect:https://en.wikipedia.org/wiki/IP_codesuch as IP55 for something reasonably splash and dust-resistant (a bit of rain, not all tempests), and IP67 for something immersible.

author: themadhippy
author_rank: Super Contributor
timestamp: November 27, 2022, 01:59:27 am
content: This sort of thing?https://cpc.farnell.com/multicomp/mc001106/enclosure-ip65-pc-grey/dp/EN85489?st=enclosure%20with%20clear%20lid

author: josuah
author_rank: Regular Contributor
timestamp: November 27, 2022, 12:26:20 pm
content: For one-shot low-importance projects, I have also tried the lunch-box type, that I happened to have on my cupboard.* Tight holes in the LID for getting cables through.* Screw the board to the lid.* Screw the lid to somewhere.* Put a silica gel bag into the box (optional).* Put the box back onto the lid.This could provide better insulation than some commercial non-waterproof boxen.This will obviously not work for a commercial appliance.

author: josuah
author_rank: Regular Contributor
timestamp: November 27, 2022, 12:32:35 pm
content: Another thing to consider is old, dysfunctional equipment, from which the enclosure can be used, tossing the original PCB away (eventually scavenging the parts. Yum! Ferrite cores!).Notes fromNE555about enclosure for prototyping:http://elm-chan.org/docs/case/sk5.html(japanese, but good diagrams)

author: coppercone2
author_rank: Super Contributor
timestamp: November 27, 2022, 11:00:48 pm
content: just be careful making lids.Get a acrylic drill bit (that is sharpened like a witches hat), drill with lubricant, and use a torque wrench for fasteningI made a plexiglass cover for something that is inside a chassis, like a roof, and when I over tightened it, the plastic developed a crack.I think its kinda hard to get this right for a proper seal. You need like frames that fit over it and gaskets and shit. IMO hard to make, buy it.

author: coppercone2
author_rank: Super Contributor
timestamp: November 27, 2022, 11:05:29 pm
content: search for :clear electronics enclosurehttps://www.amazon.com/clear-project-box/s?k=clear+project+box
Identifying automotive connectors - Page 1
Forum section: electronics / general

author: pman92
author_rank: Contributor
timestamp: November 27, 2022, 04:29:15 am
content: Hey guys,I'm an auto electrician who often mucks around with car related electronics projects in my free time. I've had some luck in the past finding automotive connectors by searching the Yazaki and Sumitomo online catalogs, but I've finally came across some that I cannot find anywhere.They are all from a Toyota. There is 3 sets of them (male and female). All physically identical and plug together, except for housing color (there's a light grey, dark grey and black version).The female ones are all labeled "11273" and male "11272". I believe the genuine Toyota part numbers would be 90980–11272 and 90980–11273.There is a logo that might be an "R" or a "K", I'm not sure?They have a 2.3mm wide/0.64mm thick male terminal.Does anyone recognize the logo or connector type? What other connector manufacturers commonly supply to the automotive industry, particularly Toyota?Do you think these might have been made by or for Toyota specifically, and wont be available other than directly from Toyota?Thanks in advance

author: SmallCog
author_rank: Frequent Contributor
timestamp: November 27, 2022, 09:10:16 am
content: Looks vaguely delphi like, and whilst googling Delphi flat pin I came across this sitehttps://www.tiperformance.com.au/products/raceworks-injector-adapter-toyota-injector-harness-denso-injector-wired/] https://www.tiperformance.com.au/products/raceworks-injector-adapter-toyota-injector-harness-denso-injector-wired/They might be able to tell you what they are, I doubt they’re genuine at that price

author: pman92
author_rank: Contributor
timestamp: November 27, 2022, 09:20:20 am
content: I found plenty with similar features but none the same.After going too far down the google rabbit hole I got a lucky break, they appear to be made by a company called Tokai Rika (https://www.tokai-rika.co.jp/)Unfortunately there's everything I needed to know on the contact page:QuoteSince I cant find any trace of a clone, looks like I'm going to have to see if they are available from Toyota

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: November 27, 2022, 01:41:32 pm
content: Sometimes the connectors are made by several different manufactures.Toyota has had housings and terminals available some in kit form.Tokai Rika is that mfg.Jeff

author: SmallCog
author_rank: Frequent Contributor
timestamp: November 27, 2022, 09:15:37 pm
content: You may be able to order the connectors, or kits, from someone like PartsSouq or Amayama cheaper than from Toyota Australia
made patreon account, what next - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: November 24, 2022, 08:50:57 pm
content: patreon.com/user?u=81213570places like kickstarter seems doesnt work here

author: Jackster
author_rank: Frequent Contributor
timestamp: November 24, 2022, 10:32:58 pm
content: OnlyFans is better.

author: eti
author_rank: Super Contributor
timestamp: November 25, 2022, 02:17:16 am
content: Quote from: Jackster on November 24, 2022, 10:32:58 pmOh dear oh dear. It truly isn't.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 25, 2022, 03:53:24 am
content: Not sure I understand the question.Do you mean to ask how you get people to actually contribute now?

author: strawberry
author_rank: Super Contributor
timestamp: November 25, 2022, 07:21:57 am
content: Quote from: SiliconWizard on November 25, 2022, 03:53:24 amturn patreon into kickstarter. I guess it would be huge effort for little gain. It could have been fun some experiments on kickstarterQuote from: Jackster on November 24, 2022, 10:32:58 pmseems fun, but not plausible option

author: Geoff-AU
author_rank: Frequent Contributor
timestamp: November 26, 2022, 11:36:04 am
content: Pretty sure you have to upload a lot of youtube videos making sure to tell everyone to comment, like, subscribe and support your patreon.I don't think the other content matters, as long as every single video you make has those 4 action items for viewers.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 27, 2022, 07:57:14 pm
content: Quote from: eti on November 25, 2022, 02:17:16 amI'm pretty sure it was sarcasm.

author: Bud
author_rank: Super Contributor
timestamp: November 27, 2022, 08:31:37 pm
content: Next is to watch Fran Lab's begging videos to learn how to make your patrons finance your lifestyle.
Another colour band identification assistance please - Page 1
Forum section: electronics / general

author: Tim88
author_rank: Regular Contributor
timestamp: November 22, 2022, 01:51:27 pm
content: Good day, if anyone wishes to exercise their colour vision abilities, I would be much obliged...

author: jpanhalt
author_rank: Super Contributor
timestamp: November 22, 2022, 01:57:56 pm
content: Is it the colors that you can't tell or given the colors, the interpretation? The two colors that are indistinct to me are brown and violet. However, in what you show, the brown seems obvious.

author: Andy Watson
author_rank: Super Contributor
timestamp: November 22, 2022, 02:06:26 pm
content: 1. 1k 5%2. 680k 5%3. 2R2 5%4 1k 5%5,6 8k2 10%7 1k5 5%

author: gbaddeley
author_rank: Regular Contributor
timestamp: November 25, 2022, 12:27:39 pm
content: Also exercises the skill of immediately reading standard resistor values. Got them all in about 3 seconds.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: November 25, 2022, 12:44:23 pm
content: Yep, a good ten second test for an EE. I said 1K8 for the last > fail! Been a long time since I needed to know this, what with SMD resistors having numbers on them.Would make a good 'christmas quiz' question: What is the min and max value in ohms of these resistors in wired in series, or in parallel?