hybridfree/eevblog-posts huggingface dataset:
Your CD databook collection - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: April 29, 2025, 12:39:09 am
content: I still have a few paper databooks but once manufactures started publishing them on CDs, most of them started going to the paper recycling bins.Am I the only one who saved their collection of CDs after the internet became a thing? Let's see your collection.

author: jh15
author_rank: Frequent Contributor
timestamp: April 29, 2025, 12:42:54 am
content: That would be nice. I still treasure my databooks from the 70's and almost threw them out.

author: all_repair
author_rank: Frequent Contributor
timestamp: April 29, 2025, 02:13:25 am
content: Paper databooks and application notes I just cannot throw away. Each time I touch and flip one, the old feeling and memory just come back so strongly. For CD version, it just not the same.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 30, 2025, 12:31:18 am
content: I had a large bookshelf loaded with paper at one time. I maybe saved 5% of them.My CD collection looks like around 200 sets. A single set may have more than one CD. They take up very little room but the internet has made them useless for the most part. Once in a while company A bought company B, then company C bought A. Each marketing department doing their best to strip the original data sheets of any pesky technical details that they don't see of value.

author: EPAIII
author_rank: Super Contributor
timestamp: May 01, 2025, 05:56:50 am
content: There's something about a paper and ink data book. I can't throw them away.I guess I skipped over the DVDs.In spite of my paper data book collection, I mostly use the internet now.One thing about the paper and ink ones is you can often find application notes and suggested schematics that the internet has omitted. The price of progress, I guess.

author: RoGeorge
author_rank: Super Contributor
timestamp: May 01, 2025, 06:36:33 am
content: Here, in Eastern Europe, storing databooks didn't take much space. They were almost like unobtainium.My first TTL databook (when I was still a kid) was a small paper notebook, the size of a palm. And on each page I've hand draw the pinout of a different IC. It was not the complete 7400 series, only the most common ones: gates, counters, multiplexers, etc. Most pinouts were extracted from a monthly printed magazine, "Tehnium". Once in a while, a schematic might have happen to be printed together with a pinout picture, or, if you were lucky, once in a while there was a page with a brief datasheet table.The side effect of hand drawing them was that, unintended I've also learned the pinouts by heart.Even so, when I've got my hands on my first genuine TTL databook, it felt like WOW, I've striked gold!
Do you recognise this IC?  - Page 1
Forum section: electronics / general

author: SteveThackery
author_rank: Super Contributor
timestamp: April 29, 2025, 02:54:44 pm
content: Hey, I wonder if you could help.I'm trying to repair a DAB radio which has no audio output. Close to the point on the PCB where the speaker wires attach is this chip, marked "LS820".I do not recognise the logo, and Google can't help with the "LS820". Do any of you recognise this chip?Thanks!

author: wraper
author_rank: Unknown
timestamp: April 29, 2025, 03:00:27 pm
content: TBA820M clone

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: April 29, 2025, 03:05:29 pm
content: Same thought,Check PCB traces againstdatasheet

author: SteveThackery
author_rank: Super Contributor
timestamp: April 29, 2025, 05:15:03 pm
content: Ah, you've got it! Thank you so much - I really appreciate it.
Interesting collection - Page 1
Forum section: electronics / general

author: Chris Jones
author_rank: Regular Contributor
timestamp: April 26, 2025, 12:02:52 pm
content: I saw this on youtube and found it interesting:fortunately it is far enough from me that I can't visit, and I think it is from last year.

author: RoGeorge
author_rank: Super Contributor
timestamp: April 28, 2025, 04:21:27 pm
content: Wow!

author: Analog Kid
author_rank: Super Contributor
timestamp: April 28, 2025, 08:13:35 pm
content: This makes me think: wouldn't it be cool if there was some kind of entity, an agency or institution, whose purpose would be to preserve such collections after their owners/caretakers have passed on?Seems a shame for all that carefully collected/hoarded stuff to be just busted up and lost. I can see gigantic warehouses to hold these collections, that could be visited, perhaps even let people browse and buy stuff from them.I'd rather fund such a program than the Pentagon ...
power outage in Spain caused by "Induced Atmospheric Vibrations" - Page 1
Forum section: electronics / general

author: snarkysparky
author_rank: Frequent Contributor
timestamp: April 29, 2025, 09:16:04 am
content: Sounds like a poorly though out load of chit to me.How bout it experts. Is there any such thing?

author: mikerj
author_rank: Super Contributor
timestamp: April 29, 2025, 09:43:45 am
content: It does sound like some BS you'd try to placate an angry population with. Irrespective of the trigger mechanism it resulted in a total cascade failure which suggests a significant vulnerability in the infrastructure.

author: RoGeorge
author_rank: Super Contributor
timestamp: April 29, 2025, 09:56:33 am
content: Seehttps://www.eevblog.com/forum/renewable-energy/power-cut-in-spain-and-portugal/

author: Halcyon
author_rank: Unknown
timestamp: April 29, 2025, 10:46:04 am
content: Third topic on this one already. Continue the thread above.
Beware: jotrin.com sells your email address to spammers - Page 1
Forum section: electronics / general

author: usagi
author_rank: Frequent Contributor
timestamp: April 28, 2025, 03:47:08 am
content: Beware, if you sign up to jotrin.com, they will sell your email address to spammers.I use unique emails to track every website I sign up on, and I was able to track that jotrin.com sold my email address to theinsurancequoter.com who are affiliated with navan.comI checked with a couple EE friends and they also confirmed that jotrin.com had sold their address as well.
Proposal for an online comment filtering system - Page 1
Forum section: electronics / general

author: Analog Kid
author_rank: Super Contributor
timestamp: April 27, 2025, 05:06:38 pm
content: A current discussion here about online speech and censorship prompts me to post this.I came up with this idea some years ago and have never published it.I'm just going to post the entire text of the idea, see what people think of it.TL:DR: This system lets readers of an online forum choose to filter posts based on their own criteria, rather than having filtering imposed by the operators of the forum.Quote

author: aeg
author_rank: Regular Contributor
timestamp: April 27, 2025, 11:52:39 pm
content: You've just described GroupLens:https://dl.acm.org/doi/pdf/10.1145/192844.192905

author: Analog Kid
author_rank: Super Contributor
timestamp: April 28, 2025, 02:00:12 am
content: Quote from: aeg on April 27, 2025, 11:52:39 pmInteresting. I was pretty sure that idea couldn't have been completely original with me.Was that ever implemented?Of course, "netnews" is a thing of the past, having been utterly demolished by Google Groups.
NEWS: Strange Metals Break the Rules of Electricity - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: April 27, 2025, 11:43:08 am
content: Just saw this news on X:https://scitechdaily.com/defying-60-years-of-physics-strange-metals-break-the-rules-of-electricity/Quote

author: coppercone2
author_rank: Super Contributor
timestamp: April 27, 2025, 12:51:53 pm
content: always refreshing to hear, pinball gets old

author: RoGeorge
author_rank: Super Contributor
timestamp: April 27, 2025, 03:21:47 pm
content: "Rules of electricity" sounds weird to me, but for the curious, this is from the DOI reference:Quote

author: Gyro
author_rank: Super Contributor
timestamp: April 27, 2025, 09:08:33 pm
content: Time to spin some audio interconnects.

author: coppercone2
author_rank: Super Contributor
timestamp: April 27, 2025, 10:20:50 pm
content: how hard is it to smelt some strange metal and make some bus bars?Yb melts easy. i would hope the Rh and Si dissolve in molten Yb, possibly with some flux, since their only a few percent, because Rh melting point is 2000C, making it hard to make anything but a little nodule with a acetylene torch in a crucible

author: MrMobodies
author_rank: Super Contributor
timestamp: April 27, 2025, 10:30:24 pm
content: QuoteLooks to me a bit like electrolysis.

author: BrianHG
author_rank: Super Contributor
timestamp: April 28, 2025, 12:59:27 am
content: Quote from: Gyro on April 27, 2025, 09:08:33 pmI smell someone about to make a little gold nest...
Strange Phenomena - Page 1
Forum section: electronics / general

author: Connecteur
author_rank: Frequent Contributor
timestamp: April 20, 2025, 02:10:35 am
content: This is nothing paranormal or anything like that, just a weird quirk of electronics I've noticed.A long time ago, I carried a phone dialer/data bank. it was like a small calculator with a speaker on the back. One day I discovered I had let it run through the wash. I put it in a jar of isopropyl alcohol, and checked the circuit board for residue, but when I turned it on, it worked once and only once. After that, it was dead for all time.A few years later, I bought one of the first Sony Disc players. It had a lead-acid battery pack, but after sitting for a few years, it had gone dead. It took a charge, and even played CDs long into the night, but after that, it wouldn't take a charge at all. It was permanently dead.Now, I know all about intermittent failure. My car stereo worked on and off for months before it failed for good. This is not that. This also seems to happen with all types of rechargeable batteries; nickel, lithium, lead-acid, whichever.Since that time, I have experienced something similar half a dozen times with different devices. It came to the point where I could usually predict one single use out of something before it fails for all time. It seems to be a pattern. One I certainly can't explain. If someone knows, please explain.

author: coppercone2
author_rank: Super Contributor
timestamp: April 20, 2025, 02:13:36 am
content: Other then ball lighting, the weirdest one I saw was a small electrical explosion/spark when I was air blowing the welding area for cleaning. There was some mig wire trapped under a shelf and I got a weird low voltage high current bzzaap arc on the concrete near the wire. All the equipment was turned off for at least a week before, and the next day I disassembled the machine, checked for leakage and probed for anything like a charging cap from leakage, etc.. never found anything. I was almost wondering if there was some kinda chemical reaction/capacitor that occurred, from grinding dust, magnesium, chemicals, etc.. perhaps accumulating on buffer felt dust bunnies?. And this is a transformer machine, not inverter, mig type(I did try to see what happens when you try to buffer polish soft pure graphite, also probobly did hit some magnesium stuff, titanium, etc... lots of weird things going on thereI am not even sure if it was on the wire, I swore it was near the wire, and loud enough that a dog turned its head across the street. But not a capacitor pop, a bazapp. I wonder if they do that if you discharge them through a inductor into a short.Good idea to get a holster for your welding machines hand pieces, instead of kicking them under furniture
AT&T email-text gateway shutting down - Page 1
Forum section: electronics / general

author: antenna
author_rank: Frequent Contributor
timestamp: April 18, 2025, 11:28:17 pm
content: If you are an AT&T customer in the US, you are about to lose the ability to send text messages from an email account and vice versa. If you haven't used that feature, I encourage you to use it in hopes they keep it active. [10 digit phone number]@mms.att.net in the recipient line will send the email contents to a phone as a text and texting an email address does the reverse. This is a useful feature and I hope they don't shut it down.https://www.att.com/support/article/wireless/KM1061254/

author: IanB
author_rank: Super Contributor
timestamp: April 18, 2025, 11:36:59 pm
content: Seems like it is too easy to be abused by spammers. If it means I get fewer spam texts, that will be good.

author: antenna
author_rank: Frequent Contributor
timestamp: April 18, 2025, 11:43:57 pm
content: I have never received a text from an email account outside of the ones I sent from my computer. Yes, I agree, it could be used for that, but no more so than a bot/scammer behind a phone number.
1981: How COMPUTER GRAPHICS Will Change the World ,BBC ARCHIVE - Page 1
Forum section: electronics / general

author: brucehoult
author_rank: Super Contributor
timestamp: April 18, 2025, 03:00:48 pm
content: Not a bad time capsule."The University of Utah didn't have much equipment"!!! I was an avid reader of SIGGRAPH at the time, but we could only dream of such riches of equipment at Waikato University in the early 80s! And as for being able to casually borrow a Cray 1 in off hours ...
Youtube short ragebait model - Page 1
Forum section: electronics / general

author: John B
author_rank: Frequent Contributor
timestamp: April 06, 2025, 11:25:35 pm
content: My youtube algorithm dossier obviously knows to feed me technical stuff. I've noticed a few patterns in youtube sharts content.At first it was technical information that contained mispronunciations or obvious flaws in an explanation which triggered interaction in the comments.Then I noticed lots of DIY building/home hardware content that built things in clearly retarded ways, eg welding, wood framing etc.But now it seems to have spread to electronics as well? Am I just being trolled here?https://www.youtube.com/shorts/44XY5B4quCY

author: UnijunctionTransistor
author_rank: Frequent Contributor
timestamp: April 07, 2025, 03:49:08 am
content: No, I haven’t received these type of videos.Unless you count the videos from a guy that builds circuits in the air, without explanation, without schematics, and no parts list. Some external details are obscured, and most circuits are clearly preposterous.Let me see if I receive a sample and I’ll post here.

author: vidarr
author_rank: Frequent Contributor
timestamp: April 07, 2025, 08:34:27 pm
content: Quote from: UnijunctionTransistor on April 07, 2025, 03:49:08 amNow that you clicked on it you will. LOL.

author: Psi
author_rank: Super Contributor
timestamp: April 07, 2025, 08:56:25 pm
content: Quote from: vidarr on April 07, 2025, 08:34:27 pmHeh, he's not wrongClick at your own peril

author: John B
author_rank: Frequent Contributor
timestamp: April 07, 2025, 09:46:02 pm
content: I would have thought someone would have some input on using solder paste like that. Surely a few thousand solder balls smeared everywhere no less than twice is a little risky?Why not use use solder in wire form?

author: thm_w
author_rank: Super Contributor
timestamp: April 07, 2025, 09:56:16 pm
content: The solder balls can be cleaned up, if they ultrasonic the board after its not an issue.It is a waste to use solder paste to wick away solder, instead of just using flux alone, and using multiple types of flux. But I don't think its intentionally trolling.

author: Psi
author_rank: Super Contributor
timestamp: April 15, 2025, 11:57:17 pm
content: Are there any reliable/safe browser plugin/extensions that block all shorts that people on here use to avoid doom scrolling.

author: eutectique
author_rank: Frequent Contributor
timestamp: April 16, 2025, 11:20:44 am
content: Here is the "short" I get when scroll down.

author: UnijunctionTransistor
author_rank: Frequent Contributor
timestamp: April 16, 2025, 01:59:24 pm
content: The algorithm wants to intimately know your innermost feelings
Sanyo analog switches LC7821 vs. LC78211 - Page 1
Forum section: electronics / general

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 30, 2025, 02:49:27 pm
content: I'm trying to repair a hifi amplifier where source selection is made with a LC7821, some inputs were not working since there had been loss of regulation on the -12V rail I concluded that this must have killed the IC.Having several LC78211around I compared the datasheets found no differences so gave it a try, still some inputs are not working (I cant remember if it's exactly the same scenario as with the LC7821) and some of the switching doesn't make sense. Am I missing something in the datasheets ? I hope so because the only other option would be the CPU sending erroneous serial commands and I don't see how I can correct that.

author: floobydust
author_rank: Super Contributor
timestamp: March 31, 2025, 06:18:39 am
content: "Replacing Earlier Models: Caution is required when replacing an LC7821N, LC7823N and LC7823N with an LC78211, LC78212 and LC78213, since the S pin threshold levels differ"But they look the same in both data sheets 0-0.3VDDand 0.7VDD-VDD

author: thm_w
author_rank: Super Contributor
timestamp: March 31, 2025, 08:40:07 pm
content: Everything is the same.Can you trace the input to the specific pin on the switch and measure which switches are being enabled.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 31, 2025, 09:19:10 pm
content: Thanks for your answers.This is strange, why would Sanyo have different part numbers if absolutely everything else on the datasheets seems identical ? Then they vaguely mention this "S" pin difference but without revealing the difference, it leaves me the impression there are actual différences but they bashed a quick datasheet together without finishing it properly.I've ordered some LC7821 from Aliexpress (that's going to add another degree of uncertainty) to test, I'll return here when they arrive.I did consider changing the "S" pin state to see what effect that had as well as trying to measure individual switch states, I'll have to lift pins to do that, measuring as-is gave ambiguous results.The inputs that are never active are "CD" and "DCC IN".If things don't go better when the (maybe) new parts arrive I'll try capturing the serial addressing and switch states. For now I've moved on to something else to repair.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 15, 2025, 09:21:49 pm
content: Received myfakenewused (chipped packages and bent legs but at least they seem to be the real thing) LC7821's from Aliexpress.After replacement the input selection is working as intended.I didn't take extra time to investigate on what the LC78211 was up to.
Australian humor... the best - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 14, 2025, 01:50:12 am
content: I was watching some videos about shipwrecks and youtube recommended thisperfection(I have no idea where the hell the previous video link came from, I copy and pasted right over from the video tab)

author: 5U4GB
author_rank: Super Contributor
timestamp: April 14, 2025, 06:24:34 am
content: John Clarke, a.k.a. Fred Dagg, is famous for this sort of stuff. He's actually a NZ'er, this is some of his earlier work:."Trev, I want you to shift that hill it annoys me there. I want you to tie it down and put it in that hollow down there".

author: tom66
author_rank: Super Contributor
timestamp: April 14, 2025, 10:01:59 pm
content: One of my favourite Aussie videos (well, other than 'Front Fell Off') is this one. I wonder if it's OK nowadays...?
Identification a component please ? - Page 1
Forum section: electronics / general

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: April 12, 2025, 10:20:15 am
content: Hello, could you say what component it is please ?

author: NE666
author_rank: Frequent Contributor
timestamp: April 12, 2025, 10:41:39 am
content: It shares obvious construction parallels with diodes but, if we trust the absence of marked polarity on the PCB silkscreen, then I would guess at it being a gas discharge tube protection device.

author: NE666
author_rank: Frequent Contributor
timestamp: April 12, 2025, 10:47:44 am
content: For example:https://www.papateco.com/product/1ka-dip-glass-gas-discharge-tubes-rls102-series/

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: April 12, 2025, 12:30:47 pm
content: Thanks, it seems to be a great analysisIt arcs one time and and the SMPS refuse to operate, what damage i can expect please ?

author: Villi24
author_rank: Contributor
timestamp: April 12, 2025, 03:22:19 pm
content: I am guessing the GDT sparked to protect the circuit, but that surge likely blew the fuse or damaged key components like the rectifier, MOSFETs, or controller chip, stopping the SMPS from working.

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: April 12, 2025, 03:42:20 pm
content: Quote from: Villi24 on April 12, 2025, 03:22:19 pmNow it don't spark at all and the SMPS is dead and pobably tomorrow it will operate again for few hours... it is an intermittent failure and this PSU will probably operate if i send it to Farnel.The warranty is not expired but my SMPS is working on the bench after one night off, i'm REALLY F...DDon't worry guys i will not sent it to an EE

author: Coordonnée_chromatique
author_rank: Frequent Contributor
timestamp: April 13, 2025, 05:38:08 am
content: The PSU has started this morningThe EEs have invented the SMPS that must to sleep at night, IA revolutionYou can correct my grammar, i'm lazy.
SONOS Play:5 MOSFET marking - Page 1
Forum section: electronics / general

author: DenCraw
author_rank: Contributor
timestamp: April 09, 2025, 06:17:34 pm
content: Hi all,Trying to identify this SOT23-6 MOSFET with "M054" marking.I noticed in Dave’s Sonos teardown he finds a similar part marked "G64", which is a DMP3050LVT — maybe they are compatible, but I’m not sure.Photo attached.Any insights appreciated!

author: thm_w
author_rank: Super Contributor
timestamp: April 10, 2025, 10:18:55 pm
content: It looks like same or similar pinout, pins 1 and 2 shorted, pin 3 is the gate.But can't see the rest of the circuit.You can trace it out, measure voltages, and even if you don't find the exact part, sub one in thats equivalent.

author: DenCraw
author_rank: Contributor
timestamp: April 11, 2025, 06:36:30 am
content: Hi! First of all, thank you for your time — I really appreciate it!The chip was shown in David's Sonos Play:5 video as a P-channel MOSFET.I can't power on the PCB because too many things are shorted, and I don't want to cause more damage.I believe it's still repairable, even though the PCB looks carbonized underneath those chips, which is a concern because carbonized material can become conductive.I picked one in good condition and measured it: it's a P-channel enhanced MOSFET.I also made a small diagram. If I don't get any other replies, I'll go with the G64 MOSFET.But I found it interesting that I couldn't find any information about this particular chip. Thanks again! Photos attached.

author: thm_w
author_rank: Super Contributor
timestamp: April 11, 2025, 09:33:00 pm
content: Grind out the carbonized material wherever you see it, as you said if any is left it will conduct again.30V and 4.5A I would expect to be good enough for switching anything in a Sonos but depends where its used.
KILWINNING battery recycling fire, terrified residents hit by batteries. - Page 1
Forum section: electronics / general

author: artag
author_rank: Super Contributor
timestamp: April 14, 2025, 08:21:46 pm
content: Evil batteries. Yawn.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: April 14, 2025, 09:32:23 pm
content: The battery recycling plant is really close to the residential area.Fortunately, such disastrous situations do not exist here.Syctom paper/plastic recycling plant.Paris, 17th district. Last weekNo injuries or casualties.
What kind of microcontroller does a Spaceorb (or odd-ball HID controllers) use? - Page 1
Forum section: electronics / general

author: jimmyc_
author_rank: Contributor
timestamp: April 11, 2025, 10:05:54 am
content: Hello all,I'm puzzled with the type of microcontrollers that powers a SpaceOrb (and other odd-ball HID controllers). I'm sure they don't use the arduino Pro micro with AT32u8 chip or the ESP32 chips.What are other commercially available and commercially used USB controller chips?Keen to share?

author: Berni
author_rank: Super Contributor
timestamp: April 11, 2025, 12:19:27 pm
content: Most often they are obscure Chinese microcontrolers with 8051 cores and a hardware USB peripheral. Mostly for the reason that they cost a few cents each rather than a few dollars each (Like a STM,PIC,AVR..etc might)
What Gen Z’s Tumblr revival may tell us about the future of social networks - Page 1
Forum section: electronics / general

author: Picuino
author_rank: Super Contributor
timestamp: April 08, 2025, 02:19:46 pm
content: https://medium.com/enrique-dans/what-gen-zs-tumblr-revival-may-tell-us-about-the-future-of-social-networks-ac008970e45fIt seems that the new generations are getting tired of the dictatorship of the algorithm and are returning to more primitive solutions.Quote

author: themadhippy
author_rank: Super Contributor
timestamp: April 08, 2025, 02:47:13 pm
content: Tumblr. vintage,it started around 2007? my socks are older than that
Adam Savage Meets the Original ED-209 From RoboCop - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: April 07, 2025, 10:53:24 pm
content: Almost 40 years ago. Pretty well done.

author: Simmed
author_rank: Frequent Contributor
timestamp: April 07, 2025, 11:05:24 pm
content: *actually it is a shame they never have further stories using the same/similar robot models like EDlike maybe robocop vs ED-9000 (2026?)im not sure if this qualify as post robocop add-on or extensionthis 1 is a german series about home robot gone wrongthe styling of the robot is interesting, very "retro"this series like robocop, puts a sort of "human" inside itthe story is really nasty
Junfu capacitors - Page 1
Forum section: electronics / general

author: ss4net
author_rank: Newbie
timestamp: April 06, 2025, 01:54:20 pm
content: What the hell,nowadays...how is the quality of junfu caps?the problem that leaves me perplexed is that there does not seem to be a website and related technical sheets,i found that caps inside a fresh new Sharkoon ATX 3.1 psu.

author: wraper
author_rank: Unknown
timestamp: April 06, 2025, 02:04:09 pm
content: IMHO they're good enough. Plenty of computer PSUs use them but I did not see any actual proof that they don't last.

author: jonpaul
author_rank: Super Contributor
timestamp: April 06, 2025, 02:13:38 pm
content: Chi com junk

author: DavidAlfa
author_rank: Super Contributor
timestamp: April 06, 2025, 03:51:32 pm
content: As long as they're not Asia'x...The PSU had only 8 months, decided to not warranty it as they would probably replace it with the same crap again.Stole few caps at work instead

author: wraper
author_rank: Unknown
timestamp: April 06, 2025, 04:07:27 pm
content: Websitehttps://junfu.com.tw/index_en.php

author: ss4net
author_rank: Newbie
timestamp: April 06, 2025, 10:00:39 pm
content: ohh thanks, google only gave me old links that didn't work
2 uCurrents found after moving my lab halfway across the world - Page 1
Forum section: electronics / general

author: diegospinola
author_rank: Newbie
timestamp: April 06, 2025, 09:35:42 pm
content: Quite a few years ago I had lost these guys and figured I'd never see them again...Today the lucky uCurrent Serial number 2000 that saved my butt back in2013(2014) (when I still had a full head of hair) showed up in a lost boxFelt like some "Homeward Bound" sh*t right thereNow proudly back at the workbench reunited with its BFF the scope

author: jheissjr
author_rank: Contributor
timestamp: April 06, 2025, 10:41:28 pm
content: The CR2032's did not leak after all the years. Nice

author: diegospinola
author_rank: Newbie
timestamp: April 07, 2025, 09:57:56 am
content: not only that but one of the CRs (Maxell ) still had some juice in it...
Say a project to fit in a disposable vape - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: April 06, 2025, 12:35:03 pm
content: Collecting ideas for transforming disposable vapes into something else. Typically they have a rechargeable 3.7V/300-500mAh Li-ion (unprotected) cell, a heater/vaporizer of about 1.5\$\Omega\$ when cold, and a pressure sensor with a SMD LED. These are enclosed in a plastic or metal tube that can be open without damage.Overall, it looks reusable. A small enclosure about the size of a marker pen, with a rechargeable battery inside, and a little extra spare room if the vaporizer is removed. Maybe suitable to host a little circuit, or a probe for the lab, or maybe turn it into some other useful gadget.Anybody already reusing these?Any pics or project ideas are welcome.
Peltier (thermoelectric cooler) choosing - Page 1
Forum section: electronics / general

author: Finderbinder
author_rank: Regular Contributor
timestamp: April 02, 2025, 11:12:18 am
content: Is there a reason to search for branded Peltier element? Or any AliExpress item will work identically? And life expectancy is the same branded or unbranded?At the moment I was unsuccessful to find branded TEC1-12704 module I need.

author: coppercone2
author_rank: Super Contributor
timestamp: April 03, 2025, 10:25:08 am
content: https://www.digikey.com/en/products/filter/thermal/thermoelectric-peltier-modules/222

author: Finderbinder
author_rank: Regular Contributor
timestamp: April 03, 2025, 04:53:22 pm
content: Thanks. But question regarding lifespan and so on remains.

author: Siwastaja
author_rank: Super Contributor
timestamp: April 03, 2025, 05:57:01 pm
content: Well, generally Aliexpress crap is Aliexpress crap, and Peltier elements have pretty serious mechanical failure modes. They can die from initial mounting stress, fast thermal cycling, or vibration from doing PWM (which you of course should not do). So if reliability is of any value to you, then don't buy that crap.That being said, I have done some interesting projects with those as they are cheap enough, and most have survived.I would be interested in any differences in efficiency. Peltiers are really challenging to design with if you need any meaningful amount of heat transfer, because their COP collapse at any meaningful dT, so keeping the hot side well cooled is #1 priority, which is made pretty difficult by the huge amount of waste heat due to said poor COP. Even if not concerned about reliability, even just 10-20% better COP (at some relevant dT to your application) could be reason alone to use something more expensive. But for the Aliexpress crap, there is no reliable data available, so you can't compare. Maybe more expensive stuff isn't any better, or maybe it is, no one knows because the cheap reference is unknown.

author: Finderbinder
author_rank: Regular Contributor
timestamp: April 04, 2025, 06:52:13 pm
content: I found this:https://www.meerstetter.ch/customer-center/compendium/71-peltier-element-efficiency#COPYes, you are right, the specific Peltier element for specific narrow situation is the way to go regarding efficiency. As I need to replace 36W element, I thought I may choose say 46W for "better" cooling, but now I think I will better stay with 36W because manufacturer should had to choose (hopefully) just right element for his device.

author: TimFox
author_rank: Super Contributor
timestamp: April 04, 2025, 07:39:03 pm
content: Quote from: Siwastaja on April 03, 2025, 05:57:01 pmYes. It is important to note that the heat load into the heat sink (on the hot output end) equals the heat transferred from the cold to hot sides, plus the electrical power applied to the Peltier to move that heat against the temperature gradient. In my experience, it is easy to underestimate the heat sink load, leading to a high heat-sink temperature that increases the load further.
Afrotechmods is back - Page 1
Forum section: electronics / general

author: Peabody
author_rank: Super Contributor
timestamp: January 01, 2018, 03:08:45 am
content: After a lengthy absence, a couple days ago this showed up on his Youtube:It's about servos, and a new programming "language" for Arduino called XOD. No more sketches. Just connect the nodes on a diagram, and it writes the code for you.Anyway, all his stuff is very well done. Kind of like Great Scott, but easier to take in.

author: buck converter
author_rank: Regular Contributor
timestamp: January 01, 2018, 05:34:38 am
content: Afro is cool, but his videos are all over the place. In one video he reviews a Spectrum Analyzer and Keysight 3000t, and in another he describes basics of Arduino and LEDs.

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: January 01, 2018, 10:56:30 am
content: Quote from: buck converter on January 01, 2018, 05:34:38 amI’m not sure it matters. I think his video are interesting and anyone that puts in the effort and shares their passion is a good thing. Most people in on the YouTube game are making contents just to please themselves and aren’t in it for the money. I have many new friends and subscribers I never expected.chris

author: EEVblog
author_rank: Unknown
timestamp: April 01, 2025, 10:35:39 pm
content: 7 years later he's back again!Someone in the comments said its 7 years 4 month and 1 day since his last video, if so

author: bitwelder
author_rank: Super Contributor
timestamp: April 02, 2025, 09:53:42 am
content: Quote from: EEVblog on April 01, 2025, 10:35:39 pmWho knows, maybe it was even all planned in advance to return on a special day.

author: coppercone2
author_rank: Super Contributor
timestamp: April 02, 2025, 09:54:36 am
content: i wonder what happened to kipkay lmfaohe like got taken out by the chinese, they sold every conceivable thing he could make

author: tom66
author_rank: Super Contributor
timestamp: April 02, 2025, 10:21:10 am
content: I remember when KipKay was just reposting the same videos again and again and still getting 100k~1M+ views on each, it was weird.

author: coppercone2
author_rank: Super Contributor
timestamp: April 02, 2025, 10:22:02 am
content: some how it seems benign compared to the garbage influencers and 'talk shows' now lol

author: Refrigerator
author_rank: Super Contributor
timestamp: April 02, 2025, 10:29:30 am
content: Took me a minute to remember who he even is

author: EEVblog
author_rank: Unknown
timestamp: April 02, 2025, 11:11:18 pm
content: Quote from: tom66 on April 02, 2025, 10:21:10 amOh wow, KipKay, haven't thought about him for years.He used to get the views that al lthe other engineering youtubers lusted after.Looking at his channel is seems his demise started about 5 years ago, and all but stopped 3 years ago.
High voltage (10kV) probe to oscilloscope - Page 1
Forum section: electronics / general

author: passedpawn
author_rank: Contributor
timestamp: April 02, 2025, 12:19:56 am
content: I see stand alone probes to measure high voltages. But I'd really like to bring these signals into my agilent scope. I need to bring in up to 10kV. Low bandwidth, but AC is a must.I don't want to spend $$$ if I could spend $. Thanks in advance, my electron shepherd brethren.

author: bdunham7
author_rank: Super Contributor
timestamp: April 02, 2025, 12:55:00 am
content: Tektronix P6015. You don't need to fill it with the dielectric Freon for 10kV.https://www.ebay.com/itm/387679298575The later solid fill versions go for much more money, but perhaps you can score this one.https://www.ebay.com/itm/297157214251I'm presuming this is not a high energy circuit, if it is please disregard these options and consult an expert.

author: johansen
author_rank: Super Contributor
timestamp: April 02, 2025, 04:26:29 am
content: Quote from: bdunham7 on April 02, 2025, 12:55:00 amthe same seller has some cheaper kits without the freon bottle.about 10 years ago i recognized the core HV probe guts sold under the military NIN number and bought it for a few dollars, then built my own compensation box using the schematic. it works ok.yeah for high energy stuff you want to test your probes to at least 50% more voltage than what you're dealing with. the derate with high frequency is no joke, although i don't know if that's due to potential breakdown or just heat dissipation.the 6015 has a neon bulb in the circuit to limit the voltage that could get to the oscope to just a few hundred volts. being 1000:1 the most OP should ever get is 10 volts at the oscope.115$ for all the stock parts is a good deal.https://www.ebay.com/itm/135145449204my guess is that you could fill it with R152a (canned air duster) and the stock plastic components will have no problem handing the pressure at room temperature.

author: coppercone2
author_rank: Super Contributor
timestamp: April 02, 2025, 10:37:17 am
content: I put degassed, fine glass filtered and hot treated silicone oil in mine and it calibrated after putting capacitors there, there is a pdf somewhere how to make it freonless
youtube forced sign in - Page 1
Forum section: electronics / general

author: themadhippy
author_rank: Super Contributor
timestamp: March 30, 2025, 03:00:15 pm
content: Anyone else getting this? Whatever video i click on all i gets is a blank player with "Sign in to confirm you’re not a botThis helps protect our community".yea the cache is emptied,the machine rebooted tried another browser but still the same thing.Is it the latest attempt at killing free access? O and the irony aint lost on me when you google a solution the first hits are all links to youtube videos

author: bte
author_rank: Regular Contributor
timestamp: March 30, 2025, 07:25:04 pm
content: Maybe you are behind a CGNAT (carrier-grade NAT) and someone with the same public IP as you is doing bot-like activity, so youtube forces a sign-in to let you continue. You could try a different public IP if possible i.e. if your home network is problematic, try it on your cell phone with the IP from the cell phone ISP (meaning, don't connect your cell via WIFI to your home router as it will end up with the same public IP).EDIT: You can check to see if you are behind a CGNAT: Go to your router's management page and check the IP there. Then visit a site like whatismyip.com and check your IP. If they are different, then you are behind a CGNAT. In my case, modem public IP is 100.84.xx.yy while the whatismyip.com returns 88.230.zz.qqEDIT 2: It looks like the forum page is showing you your own IP so no need to go to another site.

author: themadhippy
author_rank: Super Contributor
timestamp: March 30, 2025, 08:24:03 pm
content: Nope no CGNATs here,although it does appear to be ip address or similar related as using a private window and no problem,tried 2 other machines with the same result.

author: Andy Chee
author_rank: Super Contributor
timestamp: March 31, 2025, 05:30:04 am
content: Are you able to post the youtube URL here?All my regular youtube viewing appear to be freely accessible without sign in; Adrian's Digital Basement, Electroboom, Lockpicking Lawyer, I Do Cars, and many more....

author: Analog Kid
author_rank: Super Contributor
timestamp: March 31, 2025, 05:48:16 am
content: No forced sign-in here either; last access was to the Mentour Pilot stuff which I access directly through the URL youtube.com/@mentourpilot.

author: EEVblog
author_rank: Unknown
timestamp: March 31, 2025, 06:12:42 am
content: Not here.Maybe you are using a VPN IP it doesn't like?

author: themadhippy
author_rank: Super Contributor
timestamp: March 31, 2025, 10:58:05 am
content: QuoteIt was any youtube video ,not one particular and included embedded videosQuoteno vpn used.It is now working fine so hopefully a temporary blip

author: vidarr
author_rank: Frequent Contributor
timestamp: April 01, 2025, 11:23:10 am
content: They block (and semi-block) entire IP ranges. You are in one of the suspicious ranges that they semi-block.
Is this a cable issue? - Page 1
Forum section: electronics / general

author: u666sa
author_rank: Frequent Contributor
timestamp: March 28, 2025, 11:00:38 am
content: Backstory. Previously I bought cheap 5 meter USB cable off ali, I left them in another country. I would connect my microscope camera to USB ports and it would work fine.Situation. I bought 5 meter USB cables off ali again (https://www.aliexpress.us/item/3256806722888376.html) and this time around on notebook 1 it says device not recognized. I double checked on notebook 2, it also says device not recognized.Then I tried an iPhone on notebook 1 it says device not recognized. On notebook 2 all works fine. Bleh.I tried shorter cable off a Hantek LCR and it the camera works just fine.Then, and this is throwing me off, I connected that 5 meter cable through this USB 3.2 Gen 1 hub, not powered without a power adapter, (https://www.aliexpress.us/item/3256802148877629.html) and lord be hold, the camera is recognized and works fine.What gives?Because if not the last thing with USB hub I'd say cable is bad and I'd cut half a meter off of it and make it good. But here, turns out cable is good. What is going on?P.S. The cable that I left in another country was cheaper than what I got now. Thinner. Not as well made.

author: u666sa
author_rank: Frequent Contributor
timestamp: March 28, 2025, 12:57:21 pm
content: Also checked on TinySA and NanoVNA, both connect fine with these cables.

author: u666sa
author_rank: Frequent Contributor
timestamp: March 28, 2025, 01:34:23 pm
content: Short cable connected to camera5 meter problematic cable connected to camera

author: bte
author_rank: Regular Contributor
timestamp: March 28, 2025, 08:49:17 pm
content: Quote from: u666sa on March 28, 2025, 01:34:23 pmSee here for various voltages and their meaning:https://kb.plugable.com/usb-hubs-cables-switches/usb-device-chargingShort cable seems to be shorting the D+ and D- so is identified as DCP. The other one seems to be pulling D+ to 3.3V and D- to GND and this is not recognized by the meter (I couldn't find it on the page I linked, as well).Maybe such a tester could identify if there's a problem with the problematic cable:https://www.amazon.com/dp/B0BW8ZC7YD

author: amyk
author_rank: Super Contributor
timestamp: March 29, 2025, 07:08:05 am
content: Quote from: u666sa on March 28, 2025, 11:00:38 amI don't think the cable is "good" but instead "marginal". That USB hub's tranceivers may be more forgiving of the signal being slightly outside the spec.

author: thm_w
author_rank: Super Contributor
timestamp: March 31, 2025, 08:03:40 pm
content: You can argue if its a cable or device issue, I don't think you can say without more evidence.I had some devices not working with quality branded long cables, because they probably never tested them with that length.https://electronics.stackexchange.com/questions/499373/exceeding-5m-for-usb-2-0-full-speedhttps://www.eaton.com/us/en-us/products/data-video-cables-accessories/usb--thunderbolt-and-lightning-cables/usb-cable-maximum-length.html
Power inductor value - Page 1
Forum section: electronics / general

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 29, 2025, 02:59:27 am
content: How can I tell what value the coil /power inductor is? It is 4.6 x 4.0mm I am guessing that is what it is. Thanks

author: wraper
author_rank: Unknown
timestamp: March 29, 2025, 03:03:58 am
content: 10uH, the same as with 3 digit SMD resistor marking.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 29, 2025, 03:22:10 am
content: I think this is it but having a hard time finding in states. Mouser or DigiKey. Any help of what to search for. Thanks

author: Smokey
author_rank: Super Contributor
timestamp: March 29, 2025, 03:30:35 am
content: This would probably work mechanically. Dunno what the rest of the spec are:https://www.digikey.com/en/products/detail/arlitech-electronic-corp/AMPI0420ED100MTA/20415862AMPI0420ED100MTA

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 29, 2025, 03:40:51 am
content: Anyway to know what amp rating I would need? It’s in an automotive obd scanner.

author: Smokey
author_rank: Super Contributor
timestamp: March 29, 2025, 03:56:23 am
content: What is the rest of the circuit?I'm assuming a DC-DC converter. What's the controller? What current output? Is it in the input filter or the output? Etc.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: March 29, 2025, 04:06:55 am
content: Wow that is way out of my knowledge, I replaced the lcd screen connector and had a bridge that shorted the inductor. Thanks

author: Smokey
author_rank: Super Contributor
timestamp: March 29, 2025, 04:14:38 am
content: No problem. It seems like all the other inductors in that size and value range have about the same current rating and saturation, so there is a good chance that part will be fine.

author: wraper
author_rank: Unknown
timestamp: March 29, 2025, 04:20:00 am
content: If you don't want to figure out intricacies of the circuit (which is not easy), you can just chose inductor rated for maximum current for its dimensions.
TPA3225 ---- ZK3002 vs ZK3002B - Page 1
Forum section: electronics / general

author: vidarr
author_rank: Frequent Contributor
timestamp: April 01, 2025, 11:50:26 am
content: The TPA3255 has these two mainboard options ZK3002, or ZK3002B. There may be others, but these rare the two I am looking at.I am about to buy one of them and not sure which to buy.The ZK3002B already has the BT 5.3 built in and also has the AUX, USB and a 10k POT mounted.The ZK3002 does not have AUX, or USB, only a three wire, female jack (L G R). But, it looks like the ZK3002 has more options, more customizable?Then, there is a MAX Version of what looks like the ZK3002, but with better capacitors, but somehow it costs less.Which one would you get?Thanks!
IR35217 Loadline_psi & Offset_Trim & Loadline_Slope values to yield beyond -25mv - Page 1
Forum section: electronics / general

author: heyitschrisninski
author_rank: Newbie
timestamp: March 28, 2025, 03:06:41 am
content: IR35217 Loadline_psi & Offset_Trim & Loadline_Slope values to yield beyond -25mv?Check out the screenshot, value 1 offset_trim yields -25mv, I tried value of 2, no change (return to baseline voltage).Advice on how to achieve less than -25mv offset?Thanks
How long does shipping actually take from EEVBlog Store to USA? - Page 1
Forum section: electronics / general

author: abiss221
author_rank: Newbie
timestamp: March 26, 2025, 09:09:23 pm
content: Has anyone from USA purchased from Dave directly on the store here? The price difference is extremely enticing but I have read the wait could be 8.5 weeks, maybe more. That was back in 2018 though. If that was the average he was definitely shipping by boat at that time. Just wondering if he still ships by boat or if there is any chance he uses air in 2025?Thanks and sorry if this doesn't belong here, I also posted in the newbie section, couldn't decide where this belongs.

author: thm_w
author_rank: Super Contributor
timestamp: March 26, 2025, 09:17:17 pm
content: It will give you two shipping options:- Sendle- DHL express zone 4DHL express is very fast, usually 2-3 days.Sendle is fast, usually 5-14 days, but I guess not guaranteed so it shows a longer estimated time. I'm not sure who does the end delivery.

author: abiss221
author_rank: Newbie
timestamp: March 26, 2025, 09:20:28 pm
content: Oh thank you very much!

author: J-R
author_rank: Super Contributor
timestamp: March 26, 2025, 11:06:13 pm
content: I suggest DHL. Should be around 3-4 days to the US.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 27, 2025, 12:09:21 am
content: Beware the surprise customs brokerage fees with DHL.

author: mwb1100
author_rank: Frequent Contributor
timestamp: March 27, 2025, 12:15:21 am
content: I used sendle for an eevblog order back in January. Took 2 weeks to my doorstep (Seattle area). I think USPS did the domestic leg, but I'm not sure.

author: rdenney
author_rank: Regular Contributor
timestamp: March 27, 2025, 01:29:44 pm
content: Quote from: abiss221 on March 26, 2025, 09:09:23 pmI ordered a DMM from Dave on February 20, and it was delivered to my home in northern Virginia on February 26. Shipper was DHL Express. There were no brokerage fees.Rick "but a meter falls under the usual import duty limit" Denney