hybridfree/eevblog-posts huggingface dataset:
Supporting hardware for EMC test setup - Page 1
Forum section: electronics / general

author: dkonigs
author_rank: Regular Contributor
timestamp: December 15, 2021, 05:30:56 pm
content: So I'm currently working on a product that will obviously have to go through EMC testing at some point. This product can be powered and/or controlled over a USB cable, and basically has two modes of operation:As a standalone device powered via an off-the-shelf USB power adapterAs a peripheral device plugged into a USB host (e.g. computer), for both power and communicationsThe test lab I've been talking to wants to do the testing on the complete system, rather than just the device that I've built. I obviously want to make sure I don't fail testing due to equipment that's not part of my device. As such, I'm going to need to select:A USB cable for connecting the device to the power/data sourceThe USB power adapter for running the device in configuration 1A laptop computer (/w at least two other peripherals, like headphones, a hub, or a thumb drive) to run the device in configuration 2Any recommendations for choosing these items?While I could easily just scrounge up any of these things, I really don't want to fail testing because one of these "external" devices is misbehaving in the lab. So I want whatever power adapter and laptop I can be certain won't have unexpected emissions, and ideally has emissions low enough that any testing issues are solely the fault of the hardware I'm actually intending to test.P.S. I don't plan to actually ship any of these items, except maybe the cable, with the device itself.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 16, 2021, 03:43:05 am
content: 1. You may want to decide early about whether you ship with a cable or not. If you decide on one, you would want to test with it and stay with that. Changing it may require some basic engineering evaluation. If you don't ship, you save the cost and can test with whatever is around, with the potential that a customer may be more likely to encounter a problem.2. Power supplies are tricky. I've evaluated products with a number of industrial 24V DIN Rail supplies. The testing results they publish are not ever in the same conditions as the actual product, so results with the complete system in the lab can be all over. For instance, it passed with the $100 supply but not the $30 supply.3. USB supplies are... suspect. Test a few from reputable manufacturers. Ideally something with datasheets that list standards it was tested to. If the USB power supply is not ever shipped, consider rigging up a battery pack to run it directly. Perhaps 4 AA cells in a holder with at most a linear regulator.4. For radiated emissions, the host computer can be set somewhat to the side. It may be possible to use a longer version of the USB cable to get it more out of view of the antenna. If failures are noted, you may need to test with either the device or the computer off to isolate if peaks are coming from the computer. For backup, bring a computer of a very different model.
How to find Bureau Veritas reports to the Machinery directive - Page 1
Forum section: electronics / general

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 12, 2021, 09:01:53 pm
content: I am trying to look up CE reports by VERITAS (Bureau Veritas?) to the Machinery directive 2006/42/CE.I can't find anything that appears to be a searchable database. I've looked reports up on Intertek, etc. without any problem. All I can find are slick sales resources.

author: ebastler
author_rank: Super Contributor
timestamp: December 14, 2021, 06:43:07 pm
content: You mean test reports (conformity assessments) for CE markings according to the machinery directive? Why would these be public, whether in a searchable database or elsewhere? Those reports are provided to the respective client only, I think.Could you please share a link to the Intertek reports you referred to? That might help to clarify what you are looking for.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 14, 2021, 07:21:04 pm
content: Quote from: ebastler on December 14, 2021, 06:43:07 pmYes, the full test reports are not something I would expect. However, I have at least encountered information referring to the product. See the Intertek example below.In this case, the manufacturer lists a VERITAS report number indicating CE approval to the directive. However, I can't even validate the existence of the report. I can't find a similar search tool associated with VERITAS / Bureau Veritas / etc. (Are they they same thing?)QuoteFor instance, here are the results for a random Tektronix product to 61010:https://ramuk.intertekconnect.com/webclients/its/dlp/euProducts.nsf/$$Search?OpenFormhttps://ramuk.intertekconnect.com/webclients/its/dlp/euProducts.nsf/cfa5cce7e7d550868525779100537786/5e9a5c57c49c9e8085257ad1006fa0d9?OpenDocument

author: ebastler
author_rank: Super Contributor
timestamp: December 14, 2021, 08:46:19 pm
content: I think the "ETL-EU mark" is an Intertek offering only -- an optional end-user-facing proof that Intertek has tested a product:https://www.intertek.com/marks/etleu/The CE regulations do not require a manufacturerer to provide such a proof to their customers. (Heck, they don't even require testing by an external test lab if you have the expertise in house.) Manufacturers just need to have documentation on file which shows that they assessed CE compliance with due diligence, or had it assessed by a 3rd party. They may need to show this to the authorities if a compliance issue should become known.If you want proof of such diligence from a supplier before buying their product, you can always ask them. If you are a big-enough customer, they will probably oblige; otherwise, probably not...
Windows 10 file explorer search results shows all files - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: December 11, 2021, 10:40:07 am
content: It is just me or is win10 file explorer crap, like the rest of it. I open it, and to do a search, I only see a cursor box, so how do u choose search parameters before typing something in and searching. Afterwards, I can see a tab that lists some search options, but I can't find it before-hand.Also when I do a basic search, so just entering a word into the search box, the results are all files in the folder, but windows was so thoughtful as to put a pale yellow highlight on the word I searched, if it's in the files name.So rather than just listing the files that have the word in the name, or tiltle or whatever, it lists ALL the dam files, but just puts a little highlight on a few of the files. And I can't see a way to make all the highlighted files be at the top of the list , all together, they are all spaced out by name, or date, everything but a positive search hit.See what I mean

author: GlennSprigg
author_rank: Super Contributor
timestamp: December 11, 2021, 01:27:53 pm
content: Hello friend. I don't understand that! I just tried a Search on Win-10 for any files with 'cat' in the filenames. This was adirectory with over a thousand embroidery files, and it only listed those specific ones?...

author: MathWizard
author_rank: Super Contributor
timestamp: December 11, 2021, 01:44:01 pm
content: Aside from having system files be visible all the time, I didn't change anything in file explorer settings since install. And I started noticing this over the Fall/AutumnWell good to know win10 UI is not this bad. I trying searching the web more

author: vad
author_rank: Frequent Contributor
timestamp: December 11, 2021, 02:30:57 pm
content: Does the full path of found files contain the word “motor”? Does the content of found HTML, CSS, Java Script files contain the word “motor”?

author: GlennSprigg
author_rank: Super Contributor
timestamp: December 13, 2021, 08:54:50 am
content: Hi. Glenn again... Sorry mate, I cant find any ref to that problem either!!Maybe try this page, on trying to fix Windows Explorer Search problems...https://www.makeuseof.com/tag/fix-windows-file-explorer-search/It sounds like you aren't happy with Win-10!! hahaha. I used to feel that way, but am now very happy with it,since having all the crap stripped out of it! It even automatically updates itself, but NEVER changes any settingsor options, or software, from how it is now, the way I want it!
Semi-lethal YT video - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: December 12, 2021, 11:05:41 pm
content: This just came up on my YT suggestions just now (apologies if this has been threaded elsewhere). Jaw dropping.https://youtu.be/SJkx8HRmCTQ

author: jmelson
author_rank: Super Contributor
timestamp: December 13, 2021, 12:02:27 am
content: Yikes!!!

author: Kim Christensen
author_rank: Super Contributor
timestamp: December 13, 2021, 12:46:47 am
content: Yup pretty dumb and dangerous idea.Personnel dangers aside, this type of "test jig" can also damage many parts with it's 180VDC open circuit voltage.

author: eti
author_rank: Super Contributor
timestamp: December 13, 2021, 01:26:19 am
content: Oh my, it’s another one of those TEDIOUS “look how clever I am” type videos “I’m too clever, my ingenuity is beyond words, so I’ll play some generic music instead”This is the “TikTok” generation, where everyone thinks their poorly-conceived ideas are worth sharing, that they’ve just split the atom, and that their “genius hacks” involving a lawn mower and rice pudding are going to be a… <cringe hard>… “game changer”It’s like their silent actions are saying “LOOK! STEP ONE - NOW HOW AMAZED ARE YOU?”It’s the internet equivalent of what happens when chimpanzees are given typewriters.
Source of flash chips - Page 1
Forum section: electronics / general

author: veedub565
author_rank: Frequent Contributor
timestamp: December 15, 2021, 06:47:11 pm
content: Does anybody know a legitimate source of the obsolete Sharp LH28F320sktd flash chip. Or an equivalent that is still available ?Many fakes to be found, may or may not work. Would prefer genuine parts though.

author: tom66
author_rank: Super Contributor
timestamp: December 15, 2021, 07:08:23 pm
content: Looks like a fairly generic 56 TSOP flash.You could probably find A.N.Other flash memory device with the same pin out (the 56 TSOP package is fairly standard) and it'll work. You may even be able to go up in size, provided all of the address lines are connected. (If the unused address lines float, this could cause memory errors unless you can mod-wire the board to tie them to ground.)

author: veedub565
author_rank: Frequent Contributor
timestamp: December 15, 2021, 07:56:15 pm
content: I've found a few TSOP56 devices, all of them have much much more capacity than this one. So I wasn't sure if they would work.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: December 15, 2021, 10:15:48 pm
content: Try usinghttps://www.netcomponents.com/and tell us how it goes ;^)

author: tom66
author_rank: Super Contributor
timestamp: December 15, 2021, 11:07:22 pm
content: Quote from: veedub565 on December 15, 2021, 07:56:15 pmYou have to realise capacity is only there if it is addressed.If the device never addresses beyond the 16Mbit or whatever that device is, then you can fit a 64Mbit part and it'll behave just like a 16Mbit one, provided you program it with the same image. The CPU will not know or care that such a large device is fitted.You could have issues if the additional address lines aren't grounded, so you may have to check a schematic (if available) or meter out signals to see if they go to the CPU. In my experience it's pretty common for engineers to connect all of the address lines of their flash chip to the processor, because they may not know in advance what size they want to fit. However, this isn't guaranteed. If you're steady with soldering you could connect the redundant address lines to ground and program the image into the zero page of the flash.

author: veedub565
author_rank: Frequent Contributor
timestamp: December 16, 2021, 07:57:56 am
content: Thanks Tom, I did not know that before. So as long as its TSOP56, the correct voltage and pinout then I should be good to go. I'm ok with soldering so no probs doing that if required.I think the usual places like Mouser, Farnell etc still stock that package.
LTSpice XVII - cursor insanity! - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 11, 2021, 08:32:35 pm
content: When I use LTSpice XVII, and I am in wire placing mode. WHY, when I move my cursor left and right, does the WHOLE SCHEMATIC FLY ALL OVER THE PLACE AND GO OFF SCREEN?!I am sure it's something simple; I am still learning, and any tips would be SO much appreciated.Thanks ever so much.Matt.

author: Ian.M
author_rank: Super Contributor
timestamp: December 11, 2021, 08:45:18 pm
content: Uncheck Tools: Control Panel tab 'Drafting Options' checkbox 'Automatically scroll the view'However you then have to scroll/pan manually, which you can do by dragging with no tool selected.

author: eti
author_rank: Super Contributor
timestamp: December 11, 2021, 08:59:35 pm
content: Quote from: Ian.M on December 11, 2021, 08:45:18 pmAhh! Many thanks, Ian
Aneng V05B - is this shill review? (Find attached PDF manual also)  - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 08, 2021, 05:40:00 am
content: Seems a bit shill-y to me, I saw him last winter and none of his "reviews" seem to hold much water. Always hyper positive, and that seems to distract from item flaws.Have you seen him before? This dmm is cheap right now - VERY cheap, but have you heard of it or of him?Thanks.... And this is the dmm: Received DMM today, VERY cute, very nice - will test. The app is superb. Also find attached the manual (not found ANYWHERE online - I scanned it on my iPhone "Notes" app - VERY useful function btw!)[Friday 10th Dec 2021]: Photos addedhttps://imgur.com/a/I7NBaqf

author: Bassman59
author_rank: Super Contributor
timestamp: December 08, 2021, 05:40:58 pm
content: Assume all YouTube reviewers are shills.The few that aren't will stand out.

author: coppice
author_rank: Super Contributor
timestamp: December 08, 2021, 05:42:18 pm
content: It can be hard to tell the shills from the over enthusiastic.

author: Bud
author_rank: Super Contributor
timestamp: December 08, 2021, 05:56:13 pm
content: "Smart meters just wanna have fun!"Yeah, beware of meters that wanna poke fun at you.

author: eti
author_rank: Super Contributor
timestamp: December 08, 2021, 08:56:47 pm
content: Find attached the manual for the Aneng V05B Bluetooth Smart digital multimeter. I scanned this on my iPhone, as I don't want MORE microsocopic Chinese "manuals" lingering around:

author: eti
author_rank: Super Contributor
timestamp: December 09, 2021, 04:10:24 am
content: Fantastic little DMM, and the app is superb. It’s perfect for £12.30 - cheaper than AliExpress!

author: eti
author_rank: Super Contributor
timestamp: December 10, 2021, 03:04:11 am
content: Photos added to opening post (also here:https://imgur.com/a/I7NBaqf)Yep, they're using those Lilliputian toytown fuses too 🤦😂

author: sleemanj
author_rank: Super Contributor
timestamp: December 10, 2021, 05:48:40 am
content: Jeeez that guy needs to turn it down a few notches, his manner makes him sound like an empty head no-nothing unboxer content farm "reviewer", but clearly he does have some knowledge, a shame I couldn't bring myself to watch it all.
Matt, I have your package! - Page 1
Forum section: electronics / general

author: Watth
author_rank: Frequent Contributor
timestamp: December 11, 2021, 10:51:18 am
content: Dear Matt G. from Maudsland, Australia,I have your Mouser package, here, in the French Alps. The person at Mouser mistook our packages when they stuck the FedEx label. Was it because our first names start with "Matt"?Any way, Matt, I sent them an e-mail about this delivery mishap.It would be difficult to make a more distant error without ending in salty water or the vacuum of space. From my research, that's 'only' 3,600 km from the exact antipodal position.FYI, Mouser, next time send it to Pitt Island to excel in the art of package misspedition.So Matt, your voltage regulators, capacitors and resistors are safe with me, in the meantime.How are my stuff doing?

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 11, 2021, 11:43:38 am
content: I've got some personal care items trying to find their way to my house. For the last 4 days I watched the postage tracking run the package across my city to my post office (who couldn't find it when I went there).Today I get an email from the eBay seller saying that they are now preparing and sending the item and sorry for the delay. (with tracking).My question is, wtf was the other phantom package?

author: eti
author_rank: Super Contributor
timestamp: December 12, 2021, 02:22:17 am
content: Quote from: Watth on December 11, 2021, 10:51:18 amIt might be questionable discernment to post someone’s private info like that. Clever people could trivially find out who and where this person is without breaking a sweat.
When the bugs get violent... - Page 1
Forum section: electronics / general

author: lemming
author_rank: Contributor
timestamp: December 09, 2021, 11:16:02 am
content: So this week has been a bit of a tumultuous one for me.Tuesday I was very closely watching some items I was bidding on at Grays auctions, namely a 3KVA UPS and Extended Battery Module for it, which I ended up winning for the princely sum of... $182.To say I was over the moon was putting it lightly.Wednesday I picked up said UPS, got it home and chucked it on the bench, it looked fairly clean and barely used, but was very VERY flat and wouldn't power up when I tried to turn it on without the AC input hooked up.It's a C19 power input, so I had to make up a 10A to C19 cable to able to plug it in, hunted around and found the requisite parts and put it together.A few things got in the way so I didn't end up powering it up till later that evening.Plugged the EBM into the UPS, plugged AC into the EBM, plugged AC into the UPS and made sure all the breakers were reset and power to the EBM was turned on. All looked good.Turned it on, got the usualBBBEEEEEEPPPthat you get when turning them on and all the fans spun up and then... *PFFFFTPOP*CLICK* and everything in my house turns off.Much swearing and cursing and naming of proverbial gods both old and new followed and a foul miasma drifted out of the UPS.I left it alone for a few hours and then figured out how to get the lid off and started poking around and it quickly became obvious something was amiss, as there was definite signs of scorching, it was not until I removed the PCB that the scale, and cause, of the damage became obvious...A fucking cockroach. Little bastard had clearly crawled under the PCB at some stage and made a nice comfy home, and when I turned the thing on he probably got quite the shock and started skittering around, before grounding one side of the transformer and getting the shock that ended his, and my UPS's, fairly short lives...For those with a robust constitution, here's all the photos of the carnage.https://photos.app.goo.gl/Y7Z7H4Asz5kikTna7
STRANGE product @ RS components - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 07, 2021, 06:16:18 am
content: What the?

author: wanderer404
author_rank: Newbie
timestamp: December 07, 2021, 06:31:03 am
content: I wonder if you have found one of their database test items?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 07, 2021, 08:48:59 am
content: I don't recall the exact number or name of the part, but I seem to recall RS, or maybe someone else [too?], having an easter egg item like that. I thought the part number had some relevance to BTTF, or a quote in the title or something, dunno.Checking, seems like this last came up on the forum back in 2014-15, and the links are long since dead...Tim

author: jc101
author_rank: Frequent Contributor
timestamp: December 07, 2021, 08:54:26 am
content: Any stock available?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 07, 2021, 10:46:20 am
content: That would make an interesting idea if a distributor wanted to run a contest, burying obviously weird products in their catalogue & having a "treasure hunt"

author: VK3DRB
author_rank: Super Contributor
timestamp: December 07, 2021, 11:21:14 am
content: Quote from: jc101 on December 07, 2021, 08:54:26 amThere will be plenty available back then. They are rated to 1.21 jiggerwhats.

author: Circlotron
author_rank: Super Contributor
timestamp: December 07, 2021, 12:19:39 pm
content: Should have posted a link to the page so we could all have a look.

author: Zero999
author_rank: Super Contributor
timestamp: December 07, 2021, 07:26:27 pm
content: Quote from: Circlotron on December 07, 2021, 12:19:39 pmIt's fake. The original poster is having us on.

author: eti
author_rank: Super Contributor
timestamp: December 08, 2021, 03:37:42 am
content: Quote from: Zero999 on December 07, 2021, 07:26:27 pmFinally someone sharp! 😁
Is there a rule of thumb for volume discounts on simple components? - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: December 06, 2021, 06:34:17 am
content: I'm wonder if there is a rule of thumb to guestimate a range for the cost of an item at a specific volume when you know the cost at a larger volume.Yes, I know the question is a bit subjective. Lets say the item is just a simple component and is a stocked part.eg, you know that a factory will sell an item for $0.10 if you buy 10k of them.Is there a way to guess a range for how much an item should cost at a qty of 500?Mainly so you can go into price negotiations with some idea what is fair.I'm mostly thinking of sellers on Alibaba.

author: duckduck
author_rank: Frequent Contributor
timestamp: December 06, 2021, 05:56:48 pm
content: Digi-Key lists pricing at different quantities (chalk and cheese, I know). That might give you a starting place. Ultimately, I think that just like shopping for a new car, the biggest guns in your negotiating arsenal are quotes from competitors.

author: thm_w
author_rank: Super Contributor
timestamp: December 06, 2021, 10:34:59 pm
content: Look up a similar part on LCSC.I would guess 11-13c at 500pc quantity.
Water Flow in Pipe - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: December 06, 2021, 09:19:28 pm
content: I am working on my hydronic heating system. It has had several modifications (at one time, it allowed 3 fuel sources) and some don't make sense now. So far, I have relied on measuring temperature/flow with my hands. A 10°F difference can be detected, but I want an actual relative flow.Here's a previous thread on EEVBlog without an answer:https://www.eevblog.com/forum/beginners/measuring-water-flow-in-a-pipe/msg3699118/#msg3699118I want a method that clamps on and is cheap. There are two on Amazon:https://www.amazon.com/HFBTE-TUF-2000B-Ultrasonic-DN25-100mm-Transducer/dp/B07S21VBWT/ref=sr_1_2_sspa?gclid=EAIaIQobChMIz7vxgYjQ9AIVs8mUCR1-PQxwEAAYBCAAEgJ7q_D_BwE&hvadid=409972621594&hvdev=c&hvlocphy=1024046&hvnetw=g&hvqmt=b&hvrand=6283237557618691081&hvtargid=kwd-15429931&hydadcr=20195_11120261&keywords=ultrasonic+flow+meter&qid=1638824782&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzN0tXME1QSE5NOUhWJmVuY3J5cHRlZElkPUEwMzEwNDM0MzBKUzlaUFYySExXSyZlbmNyeXB0ZWRBZElkPUEwNzI2NTA5TkxHOVZXNTlaU1RNJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==https://www.amazon.com/dp/B07S66TKKJ/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B07S66TKKJ&pd_rd_w=K48ow&pf_rd_p=887084a2-5c34-4113-a4f8-b7947847c308&pd_rd_wg=mBHKJ&pf_rd_r=RBTBH8Z8VVEWKKEQSG7Z&pd_rd_r=e247ac22-dbb5-4100-ba44-0710bb898844&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFSU1pMRlgwUE00WUEmZW5jcnlwdGVkSWQ9QTA1OTU3MzMyUTdQNllTSko2RFBBJmVuY3J5cHRlZEFkSWQ9QTA5NDU3ODIxSVJYTDM1MTdDTEtTJndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==Any experience with either or others in the same price range (<$400)? I am not turned on by the videos.

author: SmallCog
author_rank: Frequent Contributor
timestamp: December 08, 2021, 03:29:52 am
content: I haven't used those particular flow meters but have played around with the more expensive ultrasonic flow sensors that they're immitatingOnly gripe I have with them is that they're fiddly to get right when setting them up on a pipe.We were intending to use them to field verify EM flow meters but found them to be more trouble than they were worth. By the time we'd mucked around setting them up we would have had the 4 bolts undone and swapped the flow meter for a known good one (and compared the reported flow)I know nothing about hydronic heating to know if they'd be any good for your application - I live in a place where cooling houses is the challenge not heating them
Upper-class vs peon capacitors - Page 1
Forum section: electronics / general

author: PlainName
author_rank: Super Contributor
timestamp: December 06, 2021, 06:35:02 pm
content: Just looking around at supercaps for potential use (currently using battery to hold a system up for around 10-20 seconds) and I am seeing a range of prices (there's a surprise). For nominal 5V/1.5F good examples of the ranges are theRS Pro@ 95p each at 5-off:and theEaton Bussmann@ £7.99 each:The RS jobby has worse tolerance but, other than that, what might be justifying the price difference?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 06, 2021, 06:48:27 pm
content: Imagine you can find cheaper than brand-name of the low-ESR kind too, but that's the likely main difference between the two kinds shown. The coin type are, AFAIK, more traditional construction with high ESR, suitable for CMOS backup over some hours/days/months, and essentially no real power draw (ESR >kohms).What ESR do you need? For a 20 second time constant I would guess the latter type, that's quite a lot of current draw to discharge a farad at, as backup capacitors go.Tim

author: wraper
author_rank: Unknown
timestamp: December 06, 2021, 06:52:16 pm
content: First supercap is only good for tiny current due to very large ESR. Also it's produced by little known Shandong Goldencell Electronics Technologyhttp://www.goldencellbattery.com/, but even that is not guaranteed since RS can change the supplier at any time.

author: PlainName
author_rank: Super Contributor
timestamp: December 06, 2021, 07:00:51 pm
content: Ah, thanks! I missed the ESR...
Crypto currency protection tent - Page 1
Forum section: electronics / general

author: Echo88
author_rank: Frequent Contributor
timestamp: December 03, 2021, 04:00:37 pm
content: https://hollandshielding.com/Crypto-currency-protection-tentA tinfoil hat, just bigger

author: PaulAm
author_rank: Frequent Contributor
timestamp: December 03, 2021, 06:37:40 pm
content: Reminds me a bit of the "Cone of Silence" (google it).

author: duckduck
author_rank: Frequent Contributor
timestamp: December 03, 2021, 07:07:11 pm
content: Bought one of these tents but my WiFi didn't work inside it for some reason. I had to return it.

author: Someone
author_rank: Super Contributor
timestamp: December 03, 2021, 10:19:41 pm
content: Again? They don't need more links:https://www.eevblog.com/forum/dodgy-technology/crypto-currency-protection-tent-seriously!/

author: nctnico
author_rank: Super Contributor
timestamp: December 03, 2021, 10:22:35 pm
content: I guess someone forgot to undo some changes on the website after the 1st of April

author: eti
author_rank: Super Contributor
timestamp: December 04, 2021, 05:00:56 am
content: If you're gullible enough to buy imaginary "currency" through greed and laziness, hoping you'll get rich quick, then you're gullible enough to buy this.Fools and their money soon part.

author: Bassman59
author_rank: Super Contributor
timestamp: December 06, 2021, 03:01:40 am
content: Quote from: PaulAm on December 03, 2021, 06:37:40 pmSorry about that, chief!Also,has the greatest guitar solo in indie rock.
Old Hand Mixer with Gear Not Working  - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: December 03, 2021, 04:25:39 pm
content: Hello,Was obsessed with thought of disassembling 20 year old hand mixer that recently had its gear stop working. It's been through several repairs by repair shops already.So far it's very interesting and I wonder if I can fix malfunctioning gear. It used to stop at every speed with a clicking sound but now it just freely turns. There are short and long metal rods that are supposed to contact each hole on plastic plate responsible for certain speed but I noticed that there is a gap between them and plastic plate.I later found a spring and a small piece of broken plastic inside the hand mixer and put it in a switch (marked with red arrow) but don't know what they are for. After more careful inspection it's clear that plastic arch was part of rotating circle in gear until it broke.It was a fun time tinkering with old mixer I gotta admit. Don't think Super Glue will hold both parts together. JB Weld will do probably... Sorry for messy shots of dirt and flour inside

author: Halcyon
author_rank: Unknown
timestamp: December 04, 2021, 05:37:24 am
content: Hi Boris, you flagged this post for removal as you fixed it yourself. Perhaps you could educate others on how you fixed it? That way anyone else looking for the same information can find it some day, instead of deleting things.

author: vk6zgo
author_rank: Super Contributor
timestamp: December 04, 2021, 06:07:39 am
content: Quote from: Boris_yo on December 03, 2021, 04:25:39 pmOhhh----I thought you meant one of these:-

author: Boris_yo
author_rank: Frequent Contributor
timestamp: December 04, 2021, 08:45:33 am
content: I thought people here who are more experienced than I am and are not interested seeing how beginner fixed his old electric hand mixer.I used Super Glue to restore broken circle piece of plastic that regulates speeds. The glue dried within minutes and 20 minutes later I could turn speeds switch. I used conpressed air to blow out flour inside and 70% rubbing alcohol on cloth to clean dirt inside.I still don't know what that spring is used for and small plastic piece didn't seem to affect anything. Hand mixer works fine now.
WIFI rf interference - Page 1
Forum section: electronics / general

author: cyberwasp
author_rank: Contributor
timestamp: November 29, 2021, 01:57:21 pm
content: I recently purchased a Netgear Nighthawk RAX 50 router. For some reason it produces an interference over the pc speakers. If there a way to stop the interference other than moving the router or speaker leads. I know it's from the router as when it's off the noise is gone. Sorry I can't provide Sory I can't provider any more info as I know it would help. TIA

author: JoeyG
author_rank: Regular Contributor
timestamp: November 29, 2021, 02:17:07 pm
content: You could try rapping multiple loops of speaker cable around a Toroidal ferrite core or ferrite cable clamp.You could also so that for the power lead going in to the speaker system.The idea being... with the ferrites in the cable paths these will have a higher impedance at 2.4GHz and 5.8GHz WiFi frequencies and the signals attenuated.

author: cyberwasp
author_rank: Contributor
timestamp: November 29, 2021, 07:40:30 pm
content: Thanks. Will give it a try

author: epongenoir
author_rank: Contributor
timestamp: December 03, 2021, 03:10:13 pm
content: I doubt 2.4/5Ghz are a problem here, have you tried changing the router power adapter?

author: mag_therm
author_rank: Frequent Contributor
timestamp: December 03, 2021, 04:22:20 pm
content: I have a new Netgear NightHawk MR60 with one of the satellites above the electronics bench used for a wired connection.I was getting interference in an rf board being tested.I put the 'scope probe with a 1 M load + 50mm wire on, first near the NetGear power supply and then near the NetGear module.Power supply is cycling at 40 us rate , emitting 20 mV p-pk to the wire.Satellite module is emitting 1200 ms long pulses sporadically at about 3/second, 100 MHz scope can only see envelope about 15 mV p-p.It looks like the emission has slow attack and decay. (triangular envelope)It is the latter one which was getting all over my board under test. ( thump..thump....thump in the recovered audio.)Cured when the board is in its shielded box.
Anisotropic Conductive Film to repair a TI92 ribbon cable? - Page 1
Forum section: electronics / general

author: jorgemef
author_rank: Regular Contributor
timestamp: December 02, 2021, 08:11:31 pm
content: Hello,I have a TI92 calculator which starting missing vertical lines. I tried to use ACF with one of these Tbar with silicon but not much progress.The ribbon has yellow "paint"/protective layer on top of the conductive layer pads. When pressed with the T-BAR on top of the assembled ACF strip it conducts (tested with aluminium foil and multimeter/ohmmeter in the other end) but after removing heat/pressure it stops conducting. What is the process? First ACF on the rybon or the parts? Do I need to clean the yellow paint? I assume it produces some hight having the paint. I first tried to apply ACF on the parts so not sure if is the right process, or if ACF goes on the rybbon first.Thanks for any help,BR,Jorge

author: amyk
author_rank: Super Contributor
timestamp: December 03, 2021, 04:00:39 am
content: QuoteThat sounds like either you're not getting it hot enough or the time spent under pressure is not long enough. What ACF are you using?

author: jorgemef
author_rank: Regular Contributor
timestamp: December 03, 2021, 10:06:40 am
content: I am using this soldering iron with setting 350ºC:https://pt.aliexpress.com/item/32807305819.html?spm=a2g0s.9042311.0.0.2742b90a3TYsL5And this ACF:https://pt.aliexpress.com/item/1005002187401604.html?spm=a2g0s.9042311.0.0.2742b90a3TYsL5Thanks for the feedback.
Figured out the right phrase to find square tubing heatsinks on AliExpress - Page 1
Forum section: electronics / general

author: duckduck
author_rank: Frequent Contributor
timestamp: December 03, 2021, 07:11:29 pm
content: I finally cracked the code.

author: magic
author_rank: Super Contributor
timestamp: December 03, 2021, 10:27:32 pm
content: That's quintessential AliExpress experience. And it's not just the fault of weird translations, but the search engine itself is very unhelpful too. You really need to hit the right phrase to get meaningful results; remove one magic word from the query and it will return completely different things or even nothing at all.And sometimes switching the sorting order causes a bunch of offers to simply disappear
Mystery (to me) bnc probe ends - Page 1
Forum section: electronics / general

author: super7800
author_rank: Regular Contributor
timestamp: November 26, 2021, 01:02:46 am
content: I recieved (a bunch, 50+) of these probes with a local purchase of two tek 7904a oscilloscopes. I would have just assumed they where custom to an application, as searching the part number turned up nothing, but I did recieve one awhile back with a previous purchase, so perhaps they are not uncommon, and I am simply unaware of them. There seems to be two varieties, one of which seems to inject what I assume to be -15v into the signal through a resistor.My question is has anyone seen these before or know of their uses? Perhaps to probe points on a custom pcb?

author: vk6zgo
author_rank: Super Contributor
timestamp: November 26, 2021, 02:09:03 am
content: I think it might be something to do with the "pre-charge" function of the 7A19 plugin.https://w140.com/tekwiki/index.php/7A19

author: super7800
author_rank: Regular Contributor
timestamp: December 01, 2021, 05:48:10 pm
content: Interesting thought, but I'm unsure as to how the connector shown relates to the precharge function. Are you referring to the "yellow connector" on one of the types of probes? Thanks

author: vk6zgo
author_rank: Super Contributor
timestamp: December 02, 2021, 12:28:52 am
content: Quote from: super7800 on December 01, 2021, 05:48:10 pmI was thinking more about your comment re "injecting -12v into the signal."

author: David Hess
author_rank: Super Contributor
timestamp: December 02, 2021, 09:31:01 pm
content: That looks like a homemade low-z offset probe, which is something that would definitely be used with a 7904. Low-z probes are simple and high bandwidth, but their low input impedance can upset the DC operating point of some circuits. An offset probe prevents this by presenting a high DC impedance at a voltage other than ground. They were commonly used for ECL.https://w140.com/tekwiki/wiki/P6230An offset probe can be as simple as injecting a current into the dividing junction of a low-Z probe.
Sony WH-1000XM3 charging issue - Page 1
Forum section: electronics / general

author: alex27riva
author_rank: Newbie
timestamp: November 29, 2021, 08:09:28 pm
content: Hi everyone, I bought a pair of Sony WH-1000XM3 headphone during black friday, and I'm having issues when charging the battery.The headphones do not charge when a power supply with a high current rating is used.I tried with my OnePlus 6 charger (5V 4A) and the original OnePlus cable and when I connect the type C connector to the headphones, the red led (charging) stays on for 3 seconds and the it turns off.I tried also with the power supply of my Huawei Matebook D 14", a 65W USB C charger with the following output:5V 2A, 9V 2A, 12V 2A, 15V 3A, 20V 3,25A but same issue..I tried with another Huawei charger, 5V 1A and it works fine... but why?There is some kind of protection in the headphones that prevents charging with high current power supplies...Other people onReddithave the same issue.I think it is a compatibility problem between the various USB C charging standards, but how could I better diagnose the problem?I also have a USB C tester bought from Aliexpress with which I could do several tests.

author: hugo
author_rank: Regular Contributor
timestamp: November 30, 2021, 02:26:29 am
content: From the manual: "Charging may not be successful with cables other than the supplied USB Type-C cable"
Technical resource for compatible footprint names - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: November 29, 2021, 11:07:13 pm
content: Is there a technical resource for compatible footprint names.Like for example, if I'm replacing a part that is SOT-723 and I want to know what other footprint name exist that might be interchangeable with SOT-723. Or even just parts that are "probably compatible but may need checking". etcThanks.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: November 30, 2021, 12:36:52 am
content: Is this pinout wise or physical package wise? Either way the best advice I can offer is to start digging yourself and saving anything that might be relevant in the futureLike attached is a presentation from On Semi that might be useful
AA Charger Detail Review - Page 1
Forum section: electronics / general

author: bobcat2000
author_rank: Regular Contributor
timestamp: November 28, 2021, 06:41:40 pm
content: Hello Hola Guten Tag,I am trying hard to look for any teardown detail review of this AA charger. I am not able to find one.If there is not much trouble, would you guys point me to one if you can find one?Thanks!Tenergy TN480U 8-Bay LCD Display Fast Charger
How to Design Impulse Drive with Rigol DG1032Z 30MHz FG.. - Page 1
Forum section: electronics / general

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 28, 2021, 04:34:37 pm
content: at around 00:32-00:34 it looks so familiar, i thought its my Uni-T device, so i paused and looked closely, it turned out to be Rigol FG unit (similar layout to my Rigol DSO unit)... so now i know how its done. with my Uni-T UTG962 60MHz at hand, maybe EmDrive should be next on my hobby project list...
why to run transistors hot? - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: November 25, 2021, 10:29:45 pm
content: what is benefit

author: fourfathom
author_rank: Super Contributor
timestamp: November 25, 2021, 10:36:19 pm
content: Not needing to use a larger transistor? As long as you have a comfortable margin there's no reason not to run a transistor a bit hot. True, elevated temperatures accelerate device degradation, but normal "hot" operation isn't hot enough to make a big difference.

author: John B
author_rank: Frequent Contributor
timestamp: November 25, 2021, 10:39:05 pm
content: Uh, could we quantify these with some numbers?

author: fourfathom
author_rank: Super Contributor
timestamp: November 25, 2021, 10:53:43 pm
content: Quote from: John B on November 25, 2021, 10:39:05 pmAsk a squishy question, get a squishy answer.

author: mc172
author_rank: Frequent Contributor
timestamp: November 25, 2021, 11:06:38 pm
content: Quote from: strawberry on November 25, 2021, 10:29:45 pmThey don't ever ask you to turn the heating on?

author: Gregg
author_rank: Super Contributor
timestamp: November 26, 2021, 12:10:13 am
content: Delta T: the hotter they are, the more heat they dissipate.

author: Brumby
author_rank: Unknown
timestamp: November 26, 2021, 12:38:05 am
content: With the information given, this is one of the better answers one could ever expect:Quote from: fourfathom on November 25, 2021, 10:36:19 pmAfter all, they just need to survive long enough to pass any warranty period - and any statutory "fit for purpose" requirements.Anybody offering high reliability products will try and reduce the operating temperature as much as possible.

author: fourfathom
author_rank: Super Contributor
timestamp: November 26, 2021, 01:50:00 am
content: Quote from: Brumby on November 26, 2021, 12:38:05 amAs much aspractical. You're not going to add a cryo-cooler unless necessary. When I think "hot", it's more like warm to the touch, but not uncomfortably so. Once it gets painful then you need to know what you're doing, and knowing theta junction/case (and other specs) is critical.

author: strawberry
author_rank: Super Contributor
timestamp: November 26, 2021, 05:03:51 pm
content: modern electronics yes, after two y buy new onebut HP, Tektronix .. metal can transistors can withstand higher heat but still why

author: Miyuki
author_rank: Frequent Contributor
timestamp: November 26, 2021, 05:12:12 pm
content: Quote from: strawberry on November 26, 2021, 05:03:51 pmYou rarely want to go near the plastic mould temperature limit of 150-175°C, metal or ceramic parts can go higher, but not much when it is just a plain silicone
Loop monitoring resistors - Page 1
Forum section: electronics / general

author: djstrattos
author_rank: Newbie
timestamp: November 27, 2021, 11:02:37 am
content: How does the below work?

author: gcewing
author_rank: Regular Contributor
timestamp: November 27, 2021, 01:04:27 pm
content: Hard to answer in detail without knowing what it's supposed to do, but it looks like an arrangement to allow whatever's on the other end to read the switch and also detect fault conditions such as an open or short circuit. It's expecting to see one of two resistance values, and anything wildly outside that range means something is wrong.
UK : appeal to help create electrical museum - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 26, 2021, 11:42:22 am
content: https://www.gofundme.com/f/what-would-you-do-with-just-250-days?utm_campaign=p_cp+share-sheet&utm_medium=copy_link_all&utm_source=customer
is verirasiums light bulb wrong was dave wrong? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: December 02, 2021, 09:54:49 pm
content: https://youtu.be/-jJB8dyOJIwI asked the same thing when you put the light bulb in different spots.What say ye? Im confused

author: Zero999
author_rank: Super Contributor
timestamp: December 03, 2021, 10:57:26 am
content: There's already a thread about this. In future, please check the recent threads, before creating one. It's not like it's an old thread, which hasn't been posted in for ages.https://www.eevblog.com/forum/chat/veritasium-(yt)-the-big-misconception-about-electricity/

author: Gyro
author_rank: Super Contributor
timestamp: December 03, 2021, 12:15:56 pm
content: Second time of providing the link too!https://www.eevblog.com/forum/blog/veritasiums-light-bulb-what-happens-to-lights-on-the-far-end-of-the-wires/
Everything you wanted to know about Jupiter's moons but were too afraid to ask - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: November 13, 2021, 11:44:39 pm
content: NASA's Stunning Discoveries on Jupiter's Largest Moons. 45mins.

author: RJSV
author_rank: Super Contributor
timestamp: November 26, 2021, 02:18:33 am
content: Wow, nice NASA footage! Thanks, Ed.That's got to be some best 'PR' for maintaining (public) interest...Fascinating, (and PG Rated!).
Bogus 5G protection device - Page 1
Forum section: electronics / general

author: Omega Glory
author_rank: Regular Contributor
timestamp: November 25, 2021, 02:57:32 pm
content: Here's a bizarre product: A Faraday cage to place your router in to block EMF and protect you from 5G...https://www.amazon.com/Router-Guard-Large-WiFi/dp/B07MXD75TR/The Q/A on this page is gold. I thought you guys might enjoy this lunacy.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 25, 2021, 07:36:24 pm
content: This page explains it all:https://emfacademy.com/wifi-router-guard/

author: Gyro
author_rank: Super Contributor
timestamp: November 25, 2021, 08:01:37 pm
content: If they were cheaper (and maybe better constructed) they might be useful for project purposes, eg. Metrology.

author: tom66
author_rank: Super Contributor
timestamp: November 25, 2021, 08:27:04 pm
content: "As you can see from the video, the WiFi router guard uses the faraday concept to block the RF radiation emitted from your router, without inhibiting your ability to use WiFi."Err... bad news guys, but it seems like someone's finally cracked on to RF engineering's biggest secret: it really is just magic pixies carrying the WiFi.

author: Red Squirrel
author_rank: Super Contributor
timestamp: November 26, 2021, 12:22:35 am
content: LOL! I think that's the one Linus Tech Tips made a video of. It turned out to be a paper holder that's been slightly modified. Something like this:https://www.amazon.com/EasyPAG-Collection-Pocket-Holder-Organizer/dp/B0727XB86N/ref=sr_1_72?keywords=metal%2Bpaper%2Bholder&qid=1637885997&sr=8-72&th=1What's funny is how 5ghz wifi and 5g confuse so many people. They are two different technologies.

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 26, 2021, 12:35:15 am
content: Quote from: Red Squirrel on November 26, 2021, 12:22:35 amOh, damn.