hybridfree/eevblog-posts huggingface dataset:
Mounting multimeter to flexible arm? - Page 1
Forum section: electronics / general

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 07, 2023, 11:36:06 pm
content: First off all, i saw this video (look from 03:40) where i shows the flexible arm with multimeter attached to.https://youtu.be/XRslhjurKbMBut he do not show how the multimeter actually was attached to the arm. Someone that knows, or have any idea?

author: Benta
author_rank: Super Contributor
timestamp: January 07, 2023, 11:49:05 pm
content: The lamp arm is standard and available everywhere..The mount depends on your multimeter and is custom. Get out your hacksaw!

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 08, 2023, 12:02:18 am
content: Quote from: Benta on January 07, 2023, 11:49:05 pmYes, i know the lamp arm is standard. And yes, also know that i can make something that works. Like zip ties through the silicone sleeve and around the arm mount etc.I just wonder if someone her maybe had an more elegant solution

author: bdunham7
author_rank: Super Contributor
timestamp: January 08, 2023, 12:06:33 am
content: A 3D-printed adapter that goes where the magnetic hanger strap would be seems to be the most elegant thing I can think of.

author: themadhippy
author_rank: Super Contributor
timestamp: January 08, 2023, 12:36:50 am
content: mic standhttps://www.k-m.de/en/products/mic-stands/microphone-desk-arms/23860-microphone-desk-arm-blackand a mobile phone/tablet holderhttps://www.k-m.de/en/products/multimedia-equipment/holders/

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 08, 2023, 12:48:33 am
content: Quote from: themadhippy on January 08, 2023, 12:36:50 amNICE!I think i'm going to fin and solition thats let me mount to multimeters on the same stand.

author: AndyBeez
author_rank: Frequent Contributor
timestamp: January 08, 2023, 12:48:42 am
content: Just mount through the rubberised multimeter case with bolts or screws; then insert the meter. You might use a Vesa mount arm from a PC monitor. These are industrial looking but robust. Monitor arms also work well supporting LED work lights.In the video, is the heat gun's hot nozzle casing really strapped direct to the arm? Are any of those flexible arms bonded to earth?

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 08, 2023, 08:41:13 am
content: Quote from: bigfoot22 on January 08, 2023, 06:39:33 amPlease keep me updated on how you solve the "problem"

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 08, 2023, 11:29:52 am
content: ThanksBut i made my own solution today with some pipes, hot glue and some wood pieces. Not the most pretty solution, but it works fine. I also got more room on my bench.A little differnt solution for my BM786:

author: ElectricPower
author_rank: Frequent Contributor
timestamp: January 08, 2023, 11:50:50 am
content: Quote from: bigfoot22 on January 08, 2023, 11:38:51 amModel number is "S180A1" and i ordered it on Aliexpress.The size is 55 cm. X 35.5 cm.Good quality matit costs about 22 dollars plus shipping.
What's that "tube" used to isolate component bodges? - Page 1
Forum section: electronics / general

author: mcinque
author_rank: Unknown
timestamp: January 07, 2023, 12:53:26 am
content: Hello all!I always see that component bodges on PCBs are often isolated with some kind of tubing.See attachments.Is that something teflon tubing to better resist to soldering or what?There is a precise product to use?

author: bdunham7
author_rank: Super Contributor
timestamp: January 07, 2023, 12:56:11 am
content: Thinwall 1/8" teflon tubing is sort of standard for this. It resists soldering heat and is impervious to moisture.

author: mcinque
author_rank: Unknown
timestamp: January 07, 2023, 01:10:36 am
content: thanks a lot!

author: tooki
author_rank: Super Contributor
timestamp: January 07, 2023, 01:24:40 am
content: Quote from: bdunham7 on January 07, 2023, 12:56:11 amYes, teflon. But much smaller than 1/8"!! The stuff in the photo is 1/16" at most.
Please remind me about magnetic field strengths, Tesla conversion from Newtons - Page 1
Forum section: electronics / general

author: Infraviolet
author_rank: Super Contributor
timestamp: January 05, 2023, 07:43:08 pm
content: I should know this, I did a physics degree many years ago, and it should be easy to find the right equations online, but I can't seem to find the right search term.I need the equations to convert from magnetic pull strength (usually given in kg, clearly in reality a measure of kg*9.81 to give N) force to get me an understanding of the magnetic flux density (mT). Just like for gravity you have a mass, and for electrostatics a charge, I want to work back from the pull strength to get a magnetic "charge" which I can then drop in to an inverse cube law and get the milliTesla field strengths at various distances along the axis from a disc shaped magnet.Can anyone remember the equations? Is there an extra variable I'd need to supply from somewhere which means that knowing the pull strength in newtons at the magnet's surface, and the distance of this surface away from an imaginary point at the magnet's centre where one can pretend the dipole resides, won't be enough to let me derive the mT flux density with distance graph?Thanks

author: berke
author_rank: Frequent Contributor
timestamp: January 05, 2023, 09:57:28 pm
content: The magnetic field drops as $$r^{-3$$ only because it's a dipole field, it results from two nearby opposite and equal charges (monopoles) cancelling eachother. The field for a cylinder magnet is non-trivial but apparently closed forms are known, this paperhttps://arxiv.org/pdf/0909.3880gives the equation for the field of a cylindrical magnet in terms of a special function C and provides a numerical procedure for computing C. At a sufficient distance you should be able to pretend that your magnet produces a field indistinguishable from a dipole field. In that case you want to know the magnetic moment. The magnetic field of a dipole is given in eq. (5.56) of Jackson (Classical Electrodynamics) as $$B(x) = \frac{3 n (n \cdot m) - m}{\|x\|^3}$$ where $$n$$ is a unit vector such that $$x = \|x\| n$$ and $$m$$ is the magnetic moment. Hope this gets you back on the right track.
Travelling Salesman, Chinese Postman... real world data sources? - Page 1
Forum section: electronics / general

author: Infraviolet
author_rank: Super Contributor
timestamp: January 01, 2023, 12:44:39 am
content: I've been looking up some stuff about various geographically themed problems in mathematics (Traveling salesman, visit each roundabout) (Chinese Postman, cover all lengths of street) (this sort of thinghttps://www.chrispanza.com/blog/shortest-route-cover-all-roadsorhttps://www.geeksforgeeks.org/traveling-salesman-problem-tsp-implementation/)and wondering about what it would be like to try on real-world rather than made-up road networks.Does anyone know if there are freely available datasets of this kind for UK roads? Or have any idea how one might convert from something like open street map in to a data format which could then be run in to the many algotihms available to try to solve rtavelling salesman and chinese postman style problems.Clearly this sort of thing is done behind the scenes on any route-planning website, but is there an available data souce to do it for yourself for real-world routes?Thanks

author: Infraviolet
author_rank: Super Contributor
timestamp: January 05, 2023, 07:44:27 pm
content: Does anyone have thoughts on this?Thanks

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: January 05, 2023, 07:59:42 pm
content: https://www.openstreetmap.org/https://wiki.openstreetmap.org/wiki/Downloading_dataTry thisAlso I'm pretty sure commercial GPS systems use heuristics (go to small road -> big road -> freeway -> big road -> small road)

author: sokoloff
author_rank: Super Contributor
timestamp: January 05, 2023, 08:08:55 pm
content: Related, maybe useful tool:https://citystrides.com/Related video of a guy who did this in Pittsburgh:
Making a Mess of the Work Bench - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: January 05, 2023, 06:15:43 am
content: my Mess of the week isaccidentally dropping an electrolytic capacitor in to a solder potpop! now I got solder from one end of the bench to the other.

author: Faranight
author_rank: Unknown
timestamp: January 05, 2023, 06:39:53 am
content: Pics, please.

author: Berni
author_rank: Super Contributor
timestamp: January 05, 2023, 06:48:48 am
content: Daaang. Yeah we are gonna need some photos

author: VK3DRB
author_rank: Super Contributor
timestamp: January 05, 2023, 09:51:26 am
content: The Japanese 5S is a great philosophy which I try to practise in my lab and at any lab I have work in.In some companies 5S means Store, Stack, Stow, Steal and Squander.In this case, it seems 5S is Solder, Splash, Sizzle, Scorch and Scold.

author: jonovid
author_rank: Super Contributor
timestamp: January 05, 2023, 10:41:15 am
content: it was only a 10uF and most of the solder spatter did not stick to the PC monitor or the oscilloscope.what looks like a 10uF electrolytic is now non existent, but it did make w loud bang. - glasses saved my eyes.I am usually more careful with the solder pot when dipping & picking Old pcb's for parts.
Czur ET24 Pro - Very large scans - Page 1
Forum section: electronics / general

author: Tony_G
author_rank: Super Contributor
timestamp: January 05, 2023, 06:09:41 am
content: Hey All,I'm thinking of buying one of these -https://www.czur.com/product/et24pro- I've watched CruiousMarc's videos on it but I'm wondering if anyone has used one to scan very large schematics? I have several original HP manuals where the fold-out schematics are something like A2 size (Actually they're probably an imperial size like US Letter McDonalds Supersize++ in reality).Has anyone actually used one of these scanners on larger than scannable pages? Previously I've gone to FedEx and used their large format scanners but I've never been happy with their outputs.Any comments are appreciated.Thanks,TonyG
PSU floating at 120V - Page 1
Forum section: electronics / general

author: PlainName
author_rank: Super Contributor
timestamp: January 04, 2023, 01:00:15 am
content: Anyone got aLX12040012V4A power supply? The output on the one I have, plugged into 240V mains, is floating at 120V - enough to give a very sharp, burning tingle when touched (current is, fortunately, ~25uA). Just wondering if this one has a fault of if they're all like this.

author: Ian.M
author_rank: Super Contributor
timestamp: January 04, 2023, 01:59:06 am
content: They'll all be like that, because that's the classic SMPSU 'Y' capacitor leakage you usually get from all SMPSUs that don't have a three pin mains connector providing ground to either the secondary side,or (rarely) an inter-winding screen.

author: PlainName
author_rank: Super Contributor
timestamp: January 04, 2023, 10:51:43 am
content: Ta.
Powertool batteries connectors wanted - Page 1
Forum section: electronics / general

author: mandor
author_rank: Regular Contributor
timestamp: January 02, 2023, 01:14:19 pm
content: I wan't to use one brand battery with another brand tool.I have a 3d printer and I would like to print the part but don't know what are the connectors called or what they could be replaced with.Let's ignore the temperature sensors. I'm just worried about the connector.The thingiverse links to thishttps://www.aliexpress.com/item/32873079089.htmlbut then i tried to search amazon and what I got is way to small.https://www.amazon.de/gp/product/B07HCN8H4X/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1Trying to get something fast in Germany.
Video: Smartphone vs. Real Meters for Sound and Light Measurement - Page 1
Forum section: electronics / general

author: HuronKing
author_rank: Frequent Contributor
timestamp: December 30, 2022, 07:50:24 pm
content: Makes sense that smartphones would be great at sound measurement. I picked up the app he was using as well (looked like DecibelX). Time to drive the wife crazy by measuring every sound!
Polarised capacitor  ̶m̶a̶x̶i̶m̶u̶m̶  minimum voltage - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: December 30, 2022, 05:34:12 pm
content: Capacitors can be damaged if too much voltage is applied.Can a capacitor get damaged if too little voltage is applied?Yes.There is a type of Li capacitors, a hybrid between a supercapacitor and a Li battery.https://www.digikey.com/en/blog/lithium-ion-capacitors-can-help-you-provide-high-quality-powerThey come charged, and become permanently damaged if discharged less than 2.5V or so, usually they should be kept charged at about 3.7V or so. Often they come with a small BMS (battery management/protection), just like a rechargeable Li-Ion and alike use to have.Found one a couple of years ago in a toy RC car, desoldered and charged it, and it was behaving about the same as a small Li-Ion battery. Then soldered it back and forgot about the RC toy car in the scrapbox.Now the "super Li capacitor" was measuring only a few mV, tried to charge it but it only heats and barely goes above 0.3V-0.6V open circuit after charging. I've desoldered the battery protection PCB and pumped more voltage/current, but it only heats and started to bulge. I guess the damage get from self discharging is fatal for Li capacitors.Sometimes called capacitor battery or alike, usually with an associated number, i.e. 13250, like the 16850 Li-Ion cells (16mm diameter 450mm height).To me it was a surprise to learn that Li capacitors have both a maximum voltage and aminimumvoltage, and that they will be permanently damaged not only by overvoltage, but by undervoltage, too.QuoteSource:https://www.nisshinbo-microdevices.co.jp/en/faq/091.html

author: AVGresponding
author_rank: Super Contributor
timestamp: December 31, 2022, 06:42:51 pm
content: And I thoughttantswere a pain in the arse...

author: Infraviolet
author_rank: Super Contributor
timestamp: December 31, 2022, 07:41:20 pm
content: Those supercaps shouldn't really be thought of as caps but as batteries. Just the way an Li battery can die if drained too far, these supercaps die too.

author: RoGeorge
author_rank: Super Contributor
timestamp: January 01, 2023, 09:21:48 am
content: Agree, though the words "super" and "capacitor" and the value "3.7F" all of them written in clear on it's body makes one think it's a supercapacitor and not a Li based rechargeable battery, or even stranger, a hybrid between a Li-Ion rechargeable and a supercapacitor.If it weren't for the small round PCB attached to it (the BMS), I would have never noticed that'snota 3.7F supercapacitor.
How to upgrade MSP-FET430UIF firmware safely - Page 1
Forum section: electronics / general

author: planc
author_rank: Regular Contributor
timestamp: December 30, 2022, 02:33:50 am
content: I got the above error when trying to update the MSP-FET430UIF hardware version V1.4a. At first I thought it was bricked when the driver at Windows 10 device manager turned to generic "USB Serial driver". But after installing Uniflash. It got backed to MSP-FET430UIF - CDC (COM6).I don't want to update it by using CCS because it may brick it. What is the proper way to update the firmware so it won't get bricked? Also why did it stop at 97% updating above and quit?
Christmas lunch saved courtesy of Messrs Packard and Hewlett - Page 1
Forum section: electronics / general

author: tggzzz
author_rank: Super Contributor
timestamp: December 27, 2022, 09:52:56 pm
content: For reasons that are too involved and boring to recount, shortly before Christmas I was faced with having to cook my Christmas feast in a mini oven measuring 28*19*11cm. The 11cm high is the limiting dimension, since the only things less high than that are snacks rather than feasts. Pigeons, quails, baby chickens would all fit, but even a guinea fowl is too high.Looking at the oven, there was little that could be done about the width and length, but the clearance between the lower heating elements and the tray was larger than necessary. So three days before Christmas, I was looking through my treasure hoard to find a way of making a shelf lower than the tray.Now a few years ago I bought an HP5371A frequency and time analyser from a well-known barn in the middle of England. When I got it, it took only 30mins to decide that the chance of it working again was infinitesimally greater than zero. So I stripped it down into its metal panels and struts, plus it's 10811 OCXO (thus ensuring I didn't actually lose money.So it came to pass that I found that one of the metal panels was ideal, even having 3mm nuts peened into it. Amazingly I also found four long 3mms bolts in my hoard, so everything was remarkably easy: two cuts and that was it.Surprisingly two days before Christmas I also found a brace of pheasants in a low-end "when it is gone, it is gone" supermarket, so that was the meat sorted.Since stories like this are nothing without pictures, there's one below. It was taken on Boxing Day, and shows how the HP5371's carcass supported the pheasants' carcasses, with maximal headroom.It all worked surprisingly well; Christmas was saved

author: HwAoRrDk
author_rank: Super Contributor
timestamp: December 28, 2022, 12:29:31 pm
content: Next up: cooking a christmas turkey in a reflow oven.Just need to select the appropriate reflow profile:> Leaded Sn60Pb40> Lead-free SAC305> Norfolk Black 6.0kg <<

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 28, 2022, 01:09:43 pm
content: Install a power diode in series with the lower element to cut the power in half, then you can use an even smaller spacing.

author: AndyC_772
author_rank: Super Contributor
timestamp: December 28, 2022, 02:32:10 pm
content: Can't believe I'm the only one that's contemplated programming a profile into an environmental test chamber... start at -20C, stay at that temperature until 23rd @ 8am, ramp slowly up to +20C by 10am on 25th, then +200 for 30 min, 160 for 4 hrs, then 220 for 30 min, then power off.

author: nfmax
author_rank: Super Contributor
timestamp: December 28, 2022, 02:47:19 pm
content: That would be the Option 022 festive meal, I think (omit turkey, add pheasant, add second channel) 😉
is https://www.dtidyhere.shop/ a reliable source? - Page 1
Forum section: electronics / general

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: December 27, 2022, 04:49:46 am
content: Hi,Wanted to buy some chokes and found what I needed athttps://www.dtidyhere.shop/But not having seen it before wondered if anyone knows if it is a reliable company?Cheers,Corby

author: tom66
author_rank: Super Contributor
timestamp: December 27, 2022, 12:32:21 pm
content: Seems dubious.From FAQ:Q: What are the accepted payment methods?A: We accept Credit Cards (only Visa), and Bank Transfer.So no PayPal, and oddly only taking Visa payments, which I'm not sure why they would require that given most good card processors take Mastercard too, and many also take Amex.A lot of these types of websites are generated, using stolen bank accounts to accept credit card payments and the like, then they disappear after never shipping things.You could get your money back by your credit card company, but it can take some time and it's not something you want to do. The fact that there's really limited information on their products, it just looks generated by scraping some website, is not a good look. Also, what the hell is that name?Maybe it's OK but I would avoid it.

author: Jackster
author_rank: Frequent Contributor
timestamp: December 27, 2022, 04:27:27 pm
content: The best way to detect if a website is a scam or a copy-paste dropship is to Google search text, with quotation marks, from the About Us and Shipping/Payment pages."We are proud of the quality and consistency of the product and service provided to our customers and we are here to make your online shopping experience excellent." will come up with all their other websites."We accept credit cards by VISA, MasterCard, and JCB, paypal etc." is another good search. Very few places advertise JCB in the west so this will show a lot of results as well.Typically spelling mistakes, broken English, and slow website (even with Cloudflare doing some caching).You will find that the shop you have listed is just another drop shipping website.I recommend using Google reverse image search and you will find an Aliexpress/Alibaba or eBay listing for it.
What's the best value aliexpress soldering station for genuine tips atm? - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: December 27, 2022, 10:19:10 pm
content: I'm looking to get a backup soldering station for me, and a soldering station for a friend.Years back another friend got an aliexpress station that takes genuine T12 tips and it was amazing value and is still going strong today.So just wondering what anyone recommends today?I can see there are some KSGER stations that take Hakko T12 and JBC-210 tips which seem popular.eghttps://www.aliexpress.com/item/1005004686214281.htmlhttps://www.aliexpress.com/item/1005003810027138.htmlhttps://www.aliexpress.com/item/4000453770565.htmlhttps://www.aliexpress.com/item/1005004229715307.htmlBut one thing I don't like is the OLED display on most of them, I can see that having a burn-in problem if left on all day.Any recommendations.Currently thinking maybe this onehttps://www.aliexpress.com/item/4000323644343.html

author: Benta
author_rank: Super Contributor
timestamp: December 28, 2022, 09:11:51 pm
content: Why does it have to be "Aliexpress"? Do you own shares?There are plenty of other internet stores.

author: TheAmmoniacal
author_rank: Unknown
timestamp: December 28, 2022, 09:48:12 pm
content: The Aixun stations looks good (T3B, T3A).SDG Electronics has many good reviews of soldering stations:

author: thm_w
author_rank: Super Contributor
timestamp: December 28, 2022, 10:23:30 pm
content: We have a forum for this:https://www.eevblog.com/forum/reviews/You can find threads there.and watch the SDG reviews as mentioned.

author: Psi
author_rank: Super Contributor
timestamp: December 28, 2022, 11:15:38 pm
content: Quote from: Benta on December 28, 2022, 09:11:51 pmyep, but aliexpress is almost always better value if you know what to buy.
Assembling NiMH battery - Page 1
Forum section: electronics / general

author: pcm81
author_rank: Regular Contributor
timestamp: January 04, 2023, 12:26:35 am
content: I have, hopefully the last, question about assembling NiMH battery.I have cycled the cells and selected the cells with matching IR and capacity.My question is: do i want to fully charge the cells or have them fully discharged to 1V before assembling them into a battery in order to make sure i have a SOC balanced assembly? I won't be able to charge individual cells after the assembly is done.Thanks ahead

author: ConKbot
author_rank: Super Contributor
timestamp: January 04, 2023, 03:35:36 am
content: Ni batteries are balanced by putting them on a trickle charge. The classic NiCd charge routine of 0.1C for up to 24Hr would balance the pack by driving every cell into overcharge, where excess energy is dissipated as heat, and nothing horrific happens for charging like this.NiMH can vary in its ability to be overcharged for a long time, and their capability to burn off the overcharge without building excessive pressure internally, so 0.1C is not always safe. Especially in low self discharge NiMH cells. If your cell manufacturer gives a trickle charge recommendation, follow that. If not, personally, I'd go for 0.05C and let it sit for 25-30 hours, while making sure it's not getting too warm while doing such.

author: bdunham7
author_rank: Super Contributor
timestamp: January 04, 2023, 03:41:44 am
content: Quote from: pcm81 on January 04, 2023, 12:26:35 amIf you were concerned about imbalance and you weren't going to equalize them afterwards, you might want them to be dead when you assemble them. This way if they are all subject to the same charge/discharge, they would go dead together, which is what you want since the best way to kill NiMH batteries is to reverse-charge the weaker cells by discharging the pack beyond dead. If they are all bottom-balanced, they'll all go dead at once. However, it probably doesn't matter in your case since they are all nicely matched. Also, charging will tend to equalize them anyway so they'll become top-balanced by natural operation.

author: IanB
author_rank: Super Contributor
timestamp: January 04, 2023, 04:40:53 am
content: I would agree with what ConKbot says. You balance an NiMH pack after it is assembled, and periodically thereafter. Balancing is done by doing a long slow charge, such as 0.1C for 16 hours. Read the manufacturer's data sheet for recommendations on this, but if these are the same cells as from the other threads, then 0.1C for 16 hours is what that data sheet recommended.
Battery Connector - Page 1
Forum section: electronics / general

author: Chipson
author_rank: Newbie
timestamp: December 26, 2022, 05:29:49 pm
content: I need that battery connectors for my DIY project. but could`t find any type of that on internet.can someone tell me what is exacly called?

author: Chebanus
author_rank: Newbie
timestamp: December 26, 2022, 06:16:50 pm
content: I would recommend looking for manufacturer markings, numbers, or anything else that might identify it.
STEM failure in the making ? - Page 1
Forum section: electronics / general

author: Andy Watson
author_rank: Super Contributor
timestamp: December 22, 2022, 12:10:33 am
content: Not sure if this should have been posted in the "Stock Image Fails" thread, or the TEA threadhttps://www.electroprops.co.uk/laboratory-workshop-scientific-research-practical/oscilloscopes-green-wavy-line-boxes"Green wavy line boxes"

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 22, 2022, 01:17:40 am
content: Maybe it's just an intentional joke. Isn't the thread about numbers a STEM failure as well?

author: tooki
author_rank: Super Contributor
timestamp: December 22, 2022, 05:41:49 pm
content: You guys realize that set designers aren’t engineers, right?

author: Andy Watson
author_rank: Super Contributor
timestamp: December 22, 2022, 05:46:15 pm
content: Perhaps I wasn't being entirely serious with the STEM failure titleJust thought it might bring a little chuckle.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 22, 2022, 05:48:45 pm
content: Actually, that is an impressive collection.
Who makes this DMM? Looks like a "Kaiweets" - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: December 16, 2022, 03:55:16 am
content: https://www.amazon.co.uk/gp/product/B07T1D1KG8/ref=ewc_pr_img_1?smid=A3P5ROKL5A1OLE&psc=1"Ultrics" - WHO? Never heard of ya. Does anyone know what this DMM is? Looks like a "Kaiweets"!

author: bdunham7
author_rank: Super Contributor
timestamp: December 16, 2022, 04:50:48 am
content: Don't go for the knock-off rubbish. Always insist on genuine Kaiweets.

author: rdl
author_rank: Super Contributor
timestamp: December 16, 2022, 06:12:46 am
content: With stuff like this, usually it's just one factory turning out the things as cheaply as possible and slapping whatever name the buyer wants on it. If you look long enough you'll probably find several other "brands" that look almost exactly the same.

author: eti
author_rank: Super Contributor
timestamp: December 21, 2022, 07:37:06 pm
content: Quote from: bdunham7 on December 16, 2022, 04:50:48 am😁Mock as you wish 😛 - this arrived and it turned out to be an HT113C, a superb meter and it only cost me a tenner!Testing:
IEEE member email list was hacked - Page 1
Forum section: electronics / general

author: graybeard
author_rank: Frequent Contributor
timestamp: December 18, 2022, 10:43:23 pm
content: I give every entity I deal with a unique email address so I can track how that email address gets used. One of the unique email address I have is for my IEEE membership.I just received a common "your computer has been hacked, pay me with bitcoin scam" emails addressed to the email I only use for my IEEE transactions.I know the IEEE sometimes shares this email address with vendors, so it is not clear where and when the email address was compromised. It could have been one of the IEEE groups I am a member of, and not the wider database.All I know for surer is a scammer has my IEEE email address.. . Chris

author: Someone
author_rank: Super Contributor
timestamp: December 18, 2022, 11:35:24 pm
content: This doesn't need a hack or leak form the source, doesn't email still rely on exposing the full address to every hop along the route?I know I get "related" floods of spam in foreign languages after corresponding with people in those locales (so often that either 95% of people have compromised clients, or its eavesdropping enroute)

author: jonpaul
author_rank: Super Contributor
timestamp: December 19, 2022, 01:31:50 am
content: check out your outbound messages, every recipient has that add in their device.One of N recipients of your email outbound from ####.ieee.org has a viruses, Trojan or malware installed on their Computer or mobileAs the number of recipients increases so does the chance of email adress list harvest.We trace most of our spams to business emails sent to clients in Asia, e.g. Chinese,HK, Malaysian and Thailand clients have little infosec and a nasty habit to cc internally to 3..10 unknown others in their firm.Easy solution....ask IEEE to change your adress and drop the contaminated one.Bon courageJon

author: graybeard
author_rank: Frequent Contributor
timestamp: December 19, 2022, 02:46:43 am
content: Quote from: jonpaul on December 19, 2022, 01:31:50 amI have 0 outbound messages with that email address. I have never used that email address to send messages. It is the email address I entered on the IEEE web site when for my subscriptions and society memberships.

author: Faranight
author_rank: Unknown
timestamp: December 19, 2022, 11:16:13 am
content: I've had some unique email addresses on a certain server that I haven't given to anyone.But despite that fact, I noticed, that some scam/spam mail started arriving to my inbox.Apparently, the scammers were sending emails with randomly forged destinations i.e. a word with some random numbers/characters after it.Most of these mails will bounce back, but those that don't bounce indicate a presence of an account by that name on the server.They managed to hit my email username with their random pattern.
What is This Tool? - Page 1
Forum section: electronics / general

author: vidarr
author_rank: Frequent Contributor
timestamp: December 21, 2022, 01:30:16 pm
content: I found a pile of these things in a box that also had radio equipment, wires and antenna stuff. I don't know if these tools are related.There are a bunch of different sizes, some really large, but otherwise, they all look exactly the same design.Thanks!

author: Andy Watson
author_rank: Super Contributor
timestamp: December 21, 2022, 01:36:13 pm
content: It is a hole punch. For making holes in soft materials - like leather, paper, card etc..

author: Roberts_Curiosity
author_rank: Contributor
timestamp: December 21, 2022, 01:43:09 pm
content: Yup, looks like a hole punch to me too.And, the part that gets punched out comes out of the slot on the side.Printing looks like the sizes are metric, and "made in Ostria" ?

author: vidarr
author_rank: Frequent Contributor
timestamp: December 21, 2022, 02:39:46 pm
content: This makes sense. There were a lot of obvious leather-working tools around too.Quote from: Roberts_Curiosity on December 21, 2022, 01:43:09 pmYeah, it says:2m/mMade inAustriaThey wrote mm like this "m/m". So, "2m/m".Also, a lot of the tools I am finding in this workshop are made in Germany, Switzerland, England, USA. Amazing good quality stuff.These tools must have cost a fortune, because this is in Brazil.Thanks guys!

author: rsjsouza
author_rank: Super Contributor
timestamp: December 21, 2022, 02:46:38 pm
content: vidarr, my dad had several of these hole punchers in various sizes. They were also made either in Austria or Germany and had exceptional quality - they were all inherited from my grandfather and both lived in Brasil.Unfortunately with my dad's passing (and both my brother and I living away from Brasil, so we couldn't keep track), my mom gave a bunch of his tools away and I suspect these were part of the bunch.
X-ray inspection - Page 1
Forum section: electronics / general

author: IconicPCB
author_rank: Super Contributor
timestamp: December 15, 2022, 06:41:55 pm
content: I am considering getting an Xray inspection unit.I am worried the unit performance might be a bit mediocre as it employs a source with a 100um target ( source of X ray radiation) at 60KV.Any opinions and comments?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 15, 2022, 07:17:20 pm
content: What exactly are you wanting to inspect?

author: TimFox
author_rank: Super Contributor
timestamp: December 15, 2022, 08:57:19 pm
content: Such a tube is used with geometric magnification of an object close to the tube, and a flat-plate or film far from the object.Tubes with larger tube targets are used at low magnification, with the object close to the film.An older reference on radiography:https://www.glaciermedicaled.com/courses/301/07_Technique_Factors.htm

author: IconicPCB
author_rank: Super Contributor
timestamp: December 16, 2022, 04:10:31 am
content: Mike,solder joints.Tim,Thank You.Always good to learn something new.I can not comment on the tube to test object distance other than to say the distance is in the 20 to 30mm range.X-Ray Flat sensor image resolution: 2.1million pixels, 18lp/mm, pixels size:18umEffective detect image area and format: 30*30mmThis all sounds clever and vaguely right but what can I expect?

author: IconicPCB
author_rank: Super Contributor
timestamp: December 17, 2022, 09:00:00 pm
content: no takers?

author: Jackster
author_rank: Frequent Contributor
timestamp: December 17, 2022, 09:31:17 pm
content: I was told by one of the experts on this forum not to get anything under 90kv for BGA components. Ideally, 120kv or higher if I recall correctly.Apparently, the tubes also degrade over time/use so that 60kv is probably a lot less than 60kv if it is old or well-used.The guy is online every so often. He might pop in and give you some info.

author: TimFox
author_rank: Super Contributor
timestamp: December 17, 2022, 09:58:36 pm
content: The tubes may degrade over time (and the focal spot become larger or current capability decline), but the voltage is determined by the power supply.

author: IconicPCB
author_rank: Super Contributor
timestamp: December 21, 2022, 08:07:13 pm
content: whimper?
Spinning Battery on Magnetic Stirrer - Page 1
Forum section: electronics / general

author: graybeard
author_rank: Frequent Contributor
timestamp: December 14, 2022, 06:35:25 pm
content: I bought this IKA C-MAG HS 4 magnetic stirrer at an industrial auction. When I got it home the motor was not working so I took it apart, cleaned it, and lubed the bushings. When I put it back together it worked.Out of curiosity I put a Rayovac AA battery on it and started it and turned it up to high. The battery started spinning rapidly.When I took as video of the spinning battery it appears to be spinning slowly. However it is not. The appearance of the slowly spinning battery is a result of the shutter rate of the video being close to the rotational rate of the battery.I does look "cool." So I decided to share it here.

author: TimFox
author_rank: Super Contributor
timestamp: December 14, 2022, 06:50:30 pm
content: Ever since the invention of cinema, audiences have become used to the retrograde artifact in the undersampled wagon wheels in cowboy movies.

author: Gregg
author_rank: Super Contributor
timestamp: December 14, 2022, 08:25:25 pm
content: That seems to be a fairly complex method of enhancing battery leakage

author: babysitter
author_rank: Frequent Contributor
timestamp: December 16, 2022, 09:29:24 pm
content: I see that some Li cells do voltage jumps and realized that movement has a influence, I guess the liquid electrolyte need to wet all surfaces. This treatment might literally shake things up.

author: richnormand
author_rank: Unknown
timestamp: December 16, 2022, 11:51:34 pm
content: Seems to be a good way to damage the coating on your heater/stirrer plate and get corrosion in the future, assuming you use it for real work....

author: eti
author_rank: Super Contributor
timestamp: December 18, 2022, 11:28:29 pm
content: For every revolution of the battery, the camera captures a frame at a slightly different position to the last frame, because the rotation speed of the battery and the shutter speed of the camera are different. If the shutter speed were were the same as the rotation speed of the battery, the battery would appear still. This is connected with beat frequency.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: December 18, 2022, 11:57:21 pm
content: Might be fun to work up some unusual geometry objects, rattlebacks for example, and watch them spin on the stirrer.Nice find on the stirrer. I assume you got a good deal.
Eben Upton Interview: Raspberry Pi Availability & More! - Page 1
Forum section: electronics / general

author: MK14
author_rank: Super Contributor
timestamp: December 19, 2022, 05:46:27 am
content: This video seems to be well worth watching, for some people. It seems to detail, about the timing of the chip shortage resolution, that is coming. Hints about what the future architecture of the Raspberry PIs, is unlikely to be, and approximate timing indications, of the eventual Raspberry PI 5.Lots of explanations, which seems to frankly explain, why things have been, the way they are. Such as the reasoning and careful, somewhat detailed explanations of why the Raspberry PIs were allocated, the way they were. Also, all sorts of other tidbits of information, for Raspberry PI enthusiasts.Please enjoy the video, and I'm very interested in any comments about it.
Walmart Classifies Logic Analyzer as Charm - Page 1
Forum section: electronics / general

author: Omega Glory
author_rank: Regular Contributor
timestamp: December 18, 2022, 02:12:46 am
content: I have discovered that Walmart is selling one of those cheap 8-channel logic analyzers, but for some bizarre reason they classified it under "Womens' Bag Charms & Accessories". I'm not sure how that happened. Perhaps because it was viewed as a USB dongle? Anyway I thought it was funny and that someone here would appreciate it. Here's the link:https://www.walmart.com/ip/USB-Logic-Analyzer-Device-Various-Trigger-Modes-USB-Logic-Analyzer-For-Transmitter-For-Inter-Integrated-Circuit/274969134

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 18, 2022, 03:04:58 am
content: From the "View seller information" link:Business Name: Wuhan Sataliuxing Keji Youxian GongsiPerhaps a translation failure?

author: MikeK
author_rank: Super Contributor
timestamp: December 18, 2022, 04:11:56 am
content: Or a prank by an employee? I approve.

author: Omega Glory
author_rank: Regular Contributor
timestamp: December 18, 2022, 04:46:24 am
content: They also don't provideanyinformation about what software to use with it. I'm surprised they find enough people to buy it, considering the only people do who are likely those who know that thisprobablyworks with the open source Sigrok/PulseView project.

author: rdl
author_rank: Super Contributor
timestamp: December 18, 2022, 05:28:01 am
content: Walmart probably had nothing to do with it. They're like many other places where you buy stuff online these days. It's a "marketplace". Pretty much anybody can sell there and this seller just made a mistake when they listed the item.

author: Bud
author_rank: Super Contributor
timestamp: December 18, 2022, 06:23:08 am
content: You guys did not get it.... It is women's logic analyzer.Still do not get it? Let me try again:This is analyzer of women's logic.Now you know why enough people bought it.

author: srb1954
author_rank: Super Contributor
timestamp: December 18, 2022, 07:48:05 am
content: Quote from: Bud on December 18, 2022, 06:23:08 amSurely that is a technologically impossible device.

author: tom66
author_rank: Super Contributor
timestamp: December 18, 2022, 08:53:18 am
content: I believe these devices are designed to interact with the Saleae software - the newer ones have FPGAs and microcontrollers in them to 'authenticate' with the software but the older ones are just Cypress USB to GPIO chips that free run on a fast enough PC.
Okay, Houston...we've had a problem here - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: December 17, 2022, 05:35:54 pm
content: https://www.space.com/roscosmos-statement-soyuz-damage-leak-space-stationhttps://blogs.nasa.gov/spacestation/I bet its aluminum tubing
microcontroller  - Page 1
Forum section: electronics / general

author: nassih
author_rank: Newbie
timestamp: December 19, 2022, 02:31:00 pm
content: hello everyone, I need your help, I am an electronics engineer and I need someone to help me solve a problem concerning a TMS320C28x microcontroller which has a problem with its firmware, my question is: there is a possibility to access this microcontroller knowing that on the electronic card have is a jtag input and a jumper to put this card in boot mode, then I want to know the tools to do this job, so I inform you that I have another card identical to that with the same microcontroller which works normally so I can extract the content of the MCU and copy it to a new chip thank you in advance friends
Zebra strips - Page 1
Forum section: electronics / general

author: Chemist_Guy
author_rank: Newbie
timestamp: December 16, 2022, 04:41:43 am
content: I was today years old when I finally realized that Zebra strips is spelled the same way as the Zebra animal.I had heard Dave speak many many times about Zebra strips said in his typical Aussie accent "Zeh-bruh" and never made the connection.My very stupid question is do Americans call them "Zee-bra" strips?

author: Psi
author_rank: Super Contributor
timestamp: December 16, 2022, 06:08:37 am
content: I was curious so I went and found a video of him saying it.He says it as 'Zeb-bra strips'https://youtu.be/Y-G4oCRfEqU?t=74

author: Halcyon
author_rank: Unknown
timestamp: December 17, 2022, 03:31:54 am
content: American's pronounce it "zee-bra", Australian's (and many other English speaking countries) say "zeb-ra" (for both the animal and the electronics component).We also pronounce the letter "Z" as "zed" not the American "zee".

author: tooki
author_rank: Super Contributor
timestamp: December 17, 2022, 02:25:58 pm
content: Quote from: Chemist_Guy on December 16, 2022, 04:41:43 am(I’m American.) Whywouldn’twe call them “zee-bruh” strips? They’re named after the animal, thanks to the alternating black stripes, and we call the animal “zee-bruh”, so…

author: themadhippy
author_rank: Super Contributor
timestamp: December 17, 2022, 02:38:33 pm
content: I thought zeebra was a piece of female clothing
NEW MOTOROLA Communication System Analyzers group - Page 1
Forum section: electronics / general

author: Crambone
author_rank: Frequent Contributor
timestamp: December 17, 2022, 04:11:05 pm
content: A new group was started just for Motorola Comm System Analyzers. It has over 100 documents, schematics, manuals…. I encourage anyone that has a Motorola Communications System Analyzer to take a look at the files section.https://groups.io/g/MotorolaCSA
Charging non-ballanced battery of NiMH - Page 1
Forum section: electronics / general

author: pcm81
author_rank: Regular Contributor
timestamp: December 15, 2022, 11:54:17 pm
content: Greetings my fellow nerds.I need to replace cells in a 2p7s NiMH battery. The problem is that the charger that this battery is hardwired to is a non-balancing charger that basically just applies 10.5V voltage and can be current limited, but it has no means to balance the cells. I have a excess amount of cells and would like to give this battery best fighting chance by selecting batteries with matching IR to avoid damage during charge cycles. Should i be matching cells with similar IR at low SOC, at 100% SOC or by some other criteria like IR vs SOC slope? I am also thinking of sorting batteries in the two banks in reverse order, by IR, and adding connections between cells in two banks to basically have a cell with high IR in parallel with a cell with low IR in the 2nd bank etc, hoping to have similar IR across every cell and prevent overvolting any one during charge cycle. Any suggestions?

author: Andreas
author_rank: Super Contributor
timestamp: December 16, 2022, 06:33:56 am
content: Hello,if the 10.5V (or 1.5V / cell) are continously applied this will "cook" the battery - especially in summer.For floating charge I usually apply max 1.45V/cell at 20 deg C reducing by -3 mV/K/cell at higher temperatures (e.g. 1.42V @ 30 deg C).This keeps the charging current in "full" state below the limit of C/50 .. C/100.Sometimes I use a NTC for the derating:https://www.eevblog.com/forum/metrology/ad587lw-10v-precision-travel-standard/msg1449488/#msg1449488If the internal resistance is too high then the cell is most probably dead.It may also have a high leakage current damaging the parallel cell.So I would parallel only cells with identically IR.With best regardsAndreas

author: tunk
author_rank: Super Contributor
timestamp: December 16, 2022, 02:52:05 pm
content: You may also want to check their capacity.Or if possible, bypass the charger and use twoli-ion cells in series, or a single cell plus a stepup circuit.

author: pcm81
author_rank: Regular Contributor
timestamp: December 16, 2022, 08:32:13 pm
content: Thanks all for the feedback. The 10.5v is not constantly applied, just for charging based on -dV. I am now leaning towards using measured capacity of each cell as the parameter to arrange them by rather than internal resistance. Replacing all cells with new, not trying to salvage.
Locking spade (faston) connectors - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: December 14, 2022, 08:04:07 pm
content: It snaps in but then the hook on the receptacle catches the whole on the spade and won't let it out until deformed and not fitting well again.Does it mean these are one-time connectors?

author: Ian.M
author_rank: Super Contributor
timestamp: December 14, 2022, 08:20:27 pm
content: Effectively, but not by intention. If the hole in the male part is punched, whether or not it releases may also depend on which way up you insert it as a little bevel on the hole edge will probably permit it to release.If you need a reliably releasable locking spade connector you need the sort with a spring tongue in the female part carrying the locking pip, that you can press to release.

author: Benta
author_rank: Super Contributor
timestamp: December 14, 2022, 08:50:32 pm
content: It means they are badly made. The protruding part on the receptacle should be a rounded dimple. not a sharp-edged protrusion.