hybridfree/eevblog-posts huggingface dataset:
Forum Help? Fixing account name - Page 1
Forum section: electronics / general

author: unknown_h
author_rank: Contributor
timestamp: August 05, 2021, 08:28:18 am
content: I am sorta unsure where to post this, when I was setting up my account I accidentally fat fingered and miss spelt my account name. I sorta just forgot about it as I don't post all that often. After studying the smf manual I am assuming that eevblog has display names disabled, so I can't fix it my self. If some one could tell me how to contact some support, or fix it (it should be unknown_h) that would be great.Thanks!

author: Halcyon
author_rank: Unknown
timestamp: August 05, 2021, 09:58:35 am
content: Seems like only Dave of Gnif can do that. They have the power.I can only change your "display name" not your actual username.

author: gnif
author_rank: Unknown
timestamp: August 05, 2021, 10:08:19 am
content: Will do...

author: gnif
author_rank: Unknown
timestamp: August 05, 2021, 10:09:56 am
content: Done
Ford All Electric Cobra Jet 1400 - Page 1
Forum section: electronics / general

author: JustMeHere
author_rank: Frequent Contributor
timestamp: August 04, 2021, 06:28:23 am
content: The videos speak for themselves. Ford is making some impressive EVs.Primer: 8.12 1/4 mileDetails:

author: bob91343
author_rank: Super Contributor
timestamp: August 04, 2021, 07:13:39 pm
content: Just for publicity.
earth leakage protection in 240 volt AC inverters - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: July 31, 2021, 02:48:46 am
content: I got given a box of old electronics.in the box was two cheap input 12volt DC to 240 volt AC output inverters.the 300watt type used for camping or outdoors. not tested then yet.I am getting second opinion before running one.what personnel protection do we have? is it floating 240 volt AC.before I start poking around inside one.what is the case here

author: james_s
author_rank: Super Contributor
timestamp: July 31, 2021, 03:07:40 am
content: They're very simple. They consist of a boost converter that generates ~340VDC which feeds an H-bridge that turns it into an AC square wave with dead time, aka "modified sine wave". The battery powering them is itself a floating source so obviously the output of the inverter will be a floating source unless you earth it.Just plug it in and connect a lightbulb or something to the output to see if it works, they're probably fine. Usually when they do fail the problem is some bad mosfets.
MOSFET question - Page 1
Forum section: electronics / general

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: August 03, 2021, 01:43:24 am
content: Hello,I just received a few Toshiba K4207 Mosfets and they act a bit differently than most other Mosfets I've tested.I think this is the datasheet.....https://alltransistors.com/mosfet/transistor.php?transistor=13707When I put my multimeter positive on the Drain and Negative probe on the Source pin I get OL (so far so good)But then if I place the multimeter positive lead on the Gate pin and then move it back to the Drain pin, I get a readiing of approximately 2.8 but jumps around for a second then quickly drops back to OL.Usually, other Mosfets seem to keep the Drain Source voltage for a lot longer.Is this any indication of the condition of the Mosfet?How could I know if I got authentic or fake Mosfets?Thanks

author: floobydust
author_rank: Super Contributor
timestamp: August 03, 2021, 03:04:34 am
content: The mosfet does have integral G-S zeners so it's possible their leakage current is what you are seeing discharge the gate-capacitance quicker than usual. You can try measure ohms G-S to see if it's strangely low or something. But it doesn't say much about what's inside. I rely on knowing the distributor I bought them from.If these are purchased from the same place you got your exploding CapXon, well... seeing these work near 150W might be disappointing and require a face shield.
The honeymoon period is over (for Telstra mobile customers on old plans) - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: July 30, 2021, 04:15:52 am
content: The time has come...I've been on one of Telstra's old grandfathered plans for a few years now. $39 per month, unlimited data (35GB at full 4G/LTE speeds then shaped after that), unlimited national calls, unlimited national SMS.From the end of next month, Telstra is forcing all customers on grandfathered plans onto one of their current plans, but with a $20/month discount for the first 12 months as a sweetener. Essentially for me, I just get more data and access to the 5G network for an additional $6/month for the first 12 months.I don't know how many of you are in the same situation?

author: wilfred
author_rank: Super Contributor
timestamp: July 30, 2021, 08:28:30 am
content: I changed from Telstra post-paid to a Boost Mobile pre-paid about 18 months ago. I was rusted on Telstra before that. I don't use much data so I opted for the 12month pre-paid SIM because I don't want to be bothered recharging every 4 weeks (or 13 times a year).I just needed to be on the Telstra network because I visit country NSW and locals say stick with Telstra's network. It's apparently a bit more reliable and repaired faster after storms. In that area anyway.It's pretty complicated trying to get the best deal these days. Hard to recommend without knowing more. Not that you asked for recommendations.FWIW I am happy with Boost and they have a 12 month SIM with 240GB for $270 ATM. And it is on the Telstra network without an (*) unlike Woolworths.

author: Halcyon
author_rank: Unknown
timestamp: July 30, 2021, 11:09:57 pm
content: Quote from: wilfred on July 30, 2021, 08:28:30 amPretty much. Telstra has the most extensive coverage in the country although the other two carriers aren't far behind. If you're in city/metro areas, you're unlikely to notice, except sometimes when you're indoors. I work in a concrete bunker and Telstra has coverage in most parts of the building, including inside lifts (elevators for you 'Mericans) where the other two drop out. I've used Telstra's network for about for about 23 years now and I don't plan on moving anytime soon.I've travelled the country quite a bit and I've never been anywhere where Telstra has no coverage but Optus or Vodafone do. It's always been the opposite experience for me. I don't mind paying a bit more for the service although my old plan was about as cheap as they come.
Rigol DS1054z in Boss Level - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: July 30, 2021, 04:35:17 pm
content: Rigol DS1054z oscilloscope in Boss Level (2020)

author: 2N3055
author_rank: Super Contributor
timestamp: July 30, 2021, 04:47:48 pm
content: Right next to Siglent on the left...
Upcoming Event - Page 1
Forum section: electronics / general

author: rcbuck
author_rank: Frequent Contributor
timestamp: July 27, 2021, 08:41:36 pm
content: I constantly see the scrolling ad at the bottom of every page. It says I should save my spot now for the Electronics Design and Test Days 2021 that is scheduled for April 13-14, 2021. Do I still have time to register?

author: Zero999
author_rank: Super Contributor
timestamp: July 29, 2021, 07:42:09 am
content: Quote from: rcbuck on July 27, 2021, 08:41:36 pmLol, I've only just noticed it, after spotting this thread. It just goes to show that my mental adblock works quite well.
2000th posting and 9th aniversary on this forum - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: July 27, 2021, 02:51:56 pm
content: Just spotted my last posting was 1999 and that makes this my 2000thposting.Incidentally today also marks the 9th anniversary of my joining this forum (27thJuly 2012) and also the 3rdanniversary of starting my test equipment company (27thJuly 2018).This is an excuse to find cake.
Where to ask questions about circuit problems? - Page 1
Forum section: electronics / general

author: giorgi3092
author_rank: Newbie
timestamp: July 31, 2021, 04:10:37 pm
content: Hello, I am revising my electronics I & II thoroughly before I start my master's soon.For that, I am going thru Razavi's Fundamentals of Microelectronics and solving basically every problem (at BJT amplifiers atm). I used Sedra's book in college and Razavi is giving me different perspectives, so I preferred this textbook. I have the solutions manual & chegg access, but I don't trust it, especially when I am sure I got the correct answer and the manual's answer is incorrect. In fact, I had a couple of these problems where both chegg and manual had wrong solutions.Every 50-60 problems, I hit the wall when I cannot figure out the circuit and that's when I need the outside help.For example, I am struggling with one CB bjt circuit right now.So, when I hit this wall, what's the best place to ask for help? Any section on this forum or any other place? I know some subreddits but not really reliable.Thanks

author: SteveyG
author_rank: Unknown
timestamp: July 31, 2021, 08:42:17 pm
content: Put it in the beginners section, ideally with pictures of your working.

author: RJSV
author_rank: Super Contributor
timestamp: July 31, 2021, 10:34:52 pm
content: Yes, beginner's section attracts, surprisingly, a lot of super-confident (and often retired !) People, looking for just that set of questions, providing expertise as a service, as an on-line community.Heck, for some of us, we love to read the details: Could you detail one of your more interesting finds, even if the two published problems conflict, in their answers.
Did I miss / mess something? SOLAR ROADWAYS Wallpaper appeared on cellphone scre - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: July 26, 2021, 04:48:33 pm
content: Ok, I really need to buy that ANDROID phones for dummies book.Appearing on my screen, (was watching eeVblog videos, on Solar Freaking Roadways), is, like, half of a picture, or poster as 'wallpaper'. Another distraction, like I'm going to spend my (valued) time to figure out my agenda-driven cellphone!!!Anyway, the wallpaper like image is showing only one half, seems to say:"lANT""lWAYS"...as if text is saying"I WANT SOLAR ROADWAYS" ...but the left half of poster/ wallpaper is cut off.WHAT THE BLOODY HELL, put that on my phone?I like watching (Dave's) delivery, on Solar Roadways, has a distance from usual politics rubbish on the tele.

author: RJSV
author_rank: Super Contributor
timestamp: July 26, 2021, 05:06:38 pm
content: I think it's my phone, has a bug where it gets mixed up briefly, sometimes the cellphone will 'flash' some picture that is next or before, the correct picture or video. So, with that 'bug', phone somehow gets stuck, displaying the wallpaper, off by one picture.At least, I do recognize the screen, is from eeVblog #1356 December 17,2020 video.This cheap Android phone is Alcatel brand, seems otherwise free of obvious bugs, maybe has overheated once or twice, I stay pretty carefull.
Electric Kettle Leaking Sometimes  - Page 1
Forum section: electronics / general

author: Boris_yo
author_rank: Frequent Contributor
timestamp: July 25, 2021, 12:14:54 pm
content: Hello,Have been using electric kettle for around 8 years.It recently started leaking but not every time.It has 4 at the bottom of its heating element where water drips from.What are they for exactly?I wouldn't mind fixing it.Can't stand throwing stuff that still can be fixed.Thanks

author: Siwastaja
author_rank: Super Contributor
timestamp: July 25, 2021, 01:26:04 pm
content: Obviously the holes are exactly to drain water that leaks so that it doesn't slowly fill the part where the electrical connections are.Glue the holes shut and you have even bigger safety hazard than you already do.You need to find the leak from the inside.

author: Boris_yo
author_rank: Frequent Contributor
timestamp: July 26, 2021, 05:05:27 pm
content: Do you think leaks can get inside kettle's charging base and get in contact with electric components?

author: wraper
author_rank: Unknown
timestamp: July 26, 2021, 05:09:35 pm
content: Kettles usually leak because limescale grows around the heating disc and under the rubber seal. Until it grows to th bottom of the seal and water starts to leak. If you clean it, kettle will work some time longer.

author: Halcyon
author_rank: Unknown
timestamp: July 26, 2021, 10:19:27 pm
content: 8 years? That's pretty good mileage. Might be time for a new one?

author: Gyro
author_rank: Super Contributor
timestamp: July 26, 2021, 10:32:38 pm
content: Are you sure it isn't condensate from the bimetal boil cutoff switch... although after 8 years, I guess you'd know.

author: Nusa
author_rank: Super Contributor
timestamp: July 27, 2021, 12:23:27 am
content: The one I have, if you fill it above the max fill line printed on it, it'll leak down the inside of the handle and into the base and onto the counter when it gets to boiling. That's actually user error, of course. After a bit of thought, I realized it's safer to have scalding overflow routed that way than spewing out where it can burn someone.
The Schaffner model FU - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: July 25, 2021, 06:12:03 pm
content: This is just part of a rather painful saga. Recently arrived: two HP 8118A pulse/data generators. The first known to power up but turns out to have a CPU board badly corroded by a leaked NiCad, the second clean but has a dead power supply.So obviously, put the good PS in the clean machine.I suppose I'd better mention that due to dismay on discovering the unit 1 corrosion, and so never powering it up, I had neglected to switch it to 240V. Even when installing that PS in unit 2. So there were initial fireworks provided by three MOVs going bang. But no other damage. Replaced them, switched to 240V, tried the PS by itself - OK. Plugged it in and the machine runs. Yay!Runs for about two minutes before going bang again. Except this time the stinky RIFA smoke kind of bang. Huh? But I'd changed the one RIFA cap on the board already! Where did the smoke come from?Ladies and gentlemen, may I present you the Schaffner model FU mains filter.AKA brick of unrepairable stinky RIFA death.So, apparently it contains at least one RIFA cap which couldn't take 240VAC. I opened the soldered-on lid, hoping to be able to melt out the potting material and repair/replace the contents. Previous metal case mains filters I opened had used tar for potting.Nope, it's a tough epoxy.Hmm... well the 2nd unit seems newer. Same custom mains filter but it looks like a later manufacture. Maybe they'd stopped using RIFA caps?Let's see. I set it up by itself on a bench with mains applied. Let it sit for several hours. No bang.OK, perhaps it will be OK. I installed it in the power supply. The machine runs again. And then half an hour later goes bang. This Schaffner FU has blown a RIFA cap too.Great. So now I have two blown, unrepairable mains filters, of a special shape and with custom mounting screws. Fantastic.FU Shaffner and RIFA.

author: madires
author_rank: Super Contributor
timestamp: July 25, 2021, 07:30:09 pm
content: Unfortunately a common problem with the old Schaffner line filters. From what I know they used Rifa caps until mid or end 90ies. Maybe you can improvise a mounting adapter with a piece of aluminium sheet.

author: floobydust
author_rank: Super Contributor
timestamp: July 25, 2021, 07:45:18 pm
content: KEMET (Vishay) is still selling those shitty Rifa capacitors PME271 series. We should file a class action lawsuit against them as they are proven kak. Even a Volkswagen-situation where Schaffner and Rifa/Vishay/KEMET know the parts are failing but stay quiet about it-is Schaffner still using them??!?With age, I find the resin case cracks and surely mashes the paper inside. It's interesting that they fail even when potted. Modern PME271 250VAC parts are tested to 3,000VDC once.All you can do is email Vishay/KEMET and point it out I guess. Because the caps are used for EMI, there must be some manufacturers afraid to design them out, so they are around to this day.
Detecting Beryllium Oxide vs Alumina? - Page 1
Forum section: electronics / general

author: Macfixer01
author_rank: Newbie
timestamp: July 25, 2021, 08:30:46 am
content: Since there is already a very old thread on this topic, it was suggested that I start a new one.I’m doing some experimenting with trying to reliably detect BeO vs Alumina using one of those cheap $10 Diamond Selector testers from eBay. They work by testing thermal conductivity of the material. BeO has much higher thermal conductivity than Alumina, and diamonds are much higher again than BeO. I only received the tester earlier today and could only find one known BeO device here at the moment for comparison, a Western Electric 416C vacuum tube. It reads full scale with beeping on the BeO parts of the tube every time, and only partial LED scale on ordinary white or purple ceramic DIP IC’s depending how the one setting pot is adjusted. I did get just a couple false positives though, and tests on a device I thought (might) be BeO was inconclusive. As I said I just started working with it tonight though, and need to find some different types of known BeO devices in my scrap collection for comparison. I’m just wondering though if anybody else has already done any work along this line? Thanks!Macfixer01
These Nichicon caps really holding up well - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: July 24, 2021, 10:54:50 am
content: I've been poking at a troublesome 5 disc cd player for a months now. It's a Sony from the early 90's. And it's basically been plugged in to the wall since 1995, except for some years when it's been unplugged all winter. And the only power switch is for the 5V logic rail, the rest has been powered.All the voltages are fine at least, but I went ahead and checked all the electro-caps, mostly nichicon, and Elna. And they are all still great compared to an average ESR chart, and they are fine for the dissipation factor in the datasheet too. I mean it's not like they're the age of Great Pyramids, but I figured they would have been a lot closer to borderline. So if I scrap this thing, there's some free caps at least.There's lots of sub 1uF radial through-hole caps everywhere, ceramic's I guess. I hope they are holding up as well.I've been chasing some intermittent door/sled problem, as well as jamming, or motor failing, or motor controller failing. I better pay closer attention to some of those small caps. Its not the 1 on the open/close button anyways.

author: wn1fju
author_rank: Frequent Contributor
timestamp: July 24, 2021, 11:37:52 am
content: Among the several hundred vintage pieces I've worked on over the years, I can count on one hand the number of times I have seen a Nichicon electrolytic fail. Usually it is the (silver colored) Sprague capacitors that are toast. And, of course, the no-name Chinese ones aren't much better.

author: amyk
author_rank: Super Contributor
timestamp: July 25, 2021, 12:16:00 am
content: Motherboards proudly proclaiming "all-Japanese capacitors" in their marketing materials are not doing that for no reason...
Cheap OLED 2x16 character displays? - Page 1
Forum section: electronics / general

author: Pineapple Dan
author_rank: Contributor
timestamp: July 23, 2021, 05:19:52 pm
content: Is there a much cheaper version of this?https://ie.rs-online.com/web/p/oled-displays/8143026/?sra=pmpnCheapest I can find on ali express is 16 + postage for a knock off one.Surely there is somebody selling a bag of 10 for the same size, or are they really that expensive? Strangely when you go to buy the little 128x96 ones they're 2 quid or less

author: fcb
author_rank: Super Contributor
timestamp: July 23, 2021, 06:11:49 pm
content: Talk to MIDAS directly, this is one of their displays. If you need an introduction to someone there who can help, PM me.
Moving on from Minipro TL866CS - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: July 17, 2021, 12:48:13 pm
content: A few years ago I bought a TL866CS and have used it extensively during that time with the Minipro 6.85 software... This device was very trendy a while back and was reviewed by MrEEVBlog et al.Now here we are in 2021 and I have a handful of Atmel 16V8CZ devices to program and these devices are NOT supported on the TL866CS....So what should I buy to replace it or should I just hold out and find some more traditional 16V8s?Thanks in advance

author: KG7AMV
author_rank: Frequent Contributor
timestamp: July 22, 2021, 08:48:13 pm
content: I recommend Xeltek Programmers massive device support even the older usb series 280U/580U/3000U support the 16V8CZ.You can find a list of devices the programmers support on their website.
Please delete thread - post moved to Other Equipment & Products - Thanks. - Page 1
Forum section: electronics / general

author: killingtime
author_rank: Regular Contributor
timestamp: July 21, 2021, 11:39:06 pm
content: Please delete thread - post moved to Other Equipment & Products

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: July 22, 2021, 05:43:34 pm
content: You might want to post your query in the "Other Equipment & Products" forum. Pace soldering stations are regularly discussed there.
New anniversary of man's landing on the Moon - Page 1
Forum section: electronics / general

author: Jorge Ginsberg
author_rank: Contributor
timestamp: July 20, 2021, 10:26:02 am
content: In 1969 I was 22 years old. I was in my 4th year of college and it was a huge thrill to see Neil Armstrong coming down the stairs.In those days the TV broadcasts were not as good as they are now but the thrill surpassed any current thrill. I dare to think that the day man reaches Mars, the emotion will not be greater than the one we felt when Neil Armstrong became the first human being to land on a body different from the Earth.By the way, in those years I worked in a communications company and used this oscilloscope:

author: AlbertL
author_rank: Regular Contributor
timestamp: July 20, 2021, 12:25:03 pm
content: Actually there is an Apollo connection with your 547. Tek 500-series scopes were the unsung heroes of the US space program - just about every NASA film from the Apollo era and before shows at least one!
JRPanel fake reviews - Page 1
Forum section: electronics / general

author: Orips
author_rank: Newbie
timestamp: July 19, 2021, 02:22:57 am
content: Has anyone ordered membrane panels or any other products from JRPanel?They appear like a legit manufacturer but I was browsing the reviews on their siteand many are obviously fake. It's not a good look.www.jrpanel.com/product/comment/?page=10

author: ataradov
author_rank: Super Contributor
timestamp: July 19, 2021, 03:36:58 am
content: Contact them and ask about those reviews. If after a couple days they stay, I would stay away from that company. If they are willing to cheat to get your business, what stops them from cheating on the job?Although your options on panel manufacturers may be limited, so in the end you will probably just have to try it yourself.Even with services like PcbWay and JlcPcb people's experiences vary a lot. So you may be passing on a good deal because someone had one negative expirience.

author: dkonigs
author_rank: Regular Contributor
timestamp: July 19, 2021, 11:47:46 pm
content: I ordered some graphic overlays from JRPanel several months ago, which I'll admit were rather simple.There was a fair bit of back-and-forth with them to get from the files I sent them upfront to something they were able to make me. However, they were quite responsive during the process. I was generally satisfied with my experience, and will likely use them again in the future.(Of course finding someone that openly admits they'll work with any random schmoe, absent some sort of "business relationship," is hard enough that I didn't really have any other choices dangling in front of me when I gave them a shot.)
"Worlds longest solar panel bike path" opens in Utrecht, Netherlands - Page 1
Forum section: electronics / general

author: lvml
author_rank: Newbie
timestamp: July 18, 2021, 09:48:05 pm
content: Maybe solar road ways do not satisfy all of our energy needs right now, but I'm sure the "World’s longest’ solar panel bike path", which was just opened in Utrecht, Netherlands, soon will!Article:https://www.dutchnews.nl/news/2021/07/worlds-longest-solar-panel-bike-bath-opens-in-utrecht/Video:It can be only days until the first power plants can be shut down due to the mightly flow of energy from this 330 metre revolution!

author: eti
author_rank: Super Contributor
timestamp: July 18, 2021, 10:56:34 pm
content: They should've adapted it to be wave powered!

author: cdev
author_rank: Super Contributor
timestamp: July 18, 2021, 11:14:36 pm
content: I would have expected more tech knowledge from the Dutch.How does it compare to a solar panel of comparable size thats not ruggedized wth some covering strong enough to support bikes and heavy people?Lucky its fairly cool in NL, I would expect the high heat from direct sun, say here, to increase the likelihood of failures a lot. Most plastics would likely crack pretty soon after installation.It looks so incredibly flat there, paradise for bicycle riders.
Hope nobody has been flooded out! - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: July 18, 2021, 11:34:07 pm
content: The area I live in has several rivers thatperiodically spead out and although I live in the hilly areas its always horrile to see peoples lives ruied by floods. Maybe we should start a thread about flooded equipment salvage?Those floods look so nasty, and the waters rose up so fast, no time to get precious hardware out of harms way. Well at least most of the water was probably mostly of the fresh variety.If any of the affected homes were of the US style gypsum wallboard and wooden studs construction have been flooded, here is a tip to minimize the potential mold problem. When wallboard has been flooded it becomes sodden and its absolutely essential to go aroound knocking a single hole in each wall cavity, ideally two one low one high in each cavity. Then try to get moving on drying it out.Remove gypsum wallboard thats gotten wet. Mold will start to grow, fast after 3 days of 99% humitity and water damage.To prevent it leaving you with a sick building remember this, the toxin formation is directly proportionate to wall cavity relative humidity. So the holes are to allow a little ventilation just so the humidiity in there is not 99% or above. The dangerous toxins only grow when the wall cavities are not merely wet, they will grow when the RH is above 85% or so but the very high RH inside a completely airtight wall cavity will required major face and airway protection for the very worst infestations. Accidentally Opening up such a wall cavity which stirs up mold and makes it sprulat in response to vibration then inhaling the air thats been inside can and does kill people You absolutely need better than the typical n-95 face mask, you need an n-100 or n-99 HEPA resirator, (magenta colo here in the US) that is the right size for your face. You should fit test it properly. You also should be clean shaven. Also wear eye protection and gloves. A completely closed and flooded wall cavity after a few days after flooding will be a real danger. As it will grow very toxic mold inside. It might then get so bad that cleaning it up might be impossible without specialized dry ice blasting equipment. But with the holes the problem will be much reduced. This is an important thing to know in any situation where the US styl home construction is used. Its a very bad way to build homes as far as mold. I could find some science to better explain with an analysis of the macrocyclic trichothecene produced in some different example situations. Gypsum wallboard when it gets wet swells up and creates an almost airtight seal, so the problem can get really really severe. Satratoxin H is around the 60th most cytotoxic substanc known to man. It also is a strong immunosuppessant. It can scar your eyes, skin, and it also will go right through the skin and enter the bloodstream, readily. Treat it with respect and use the proper PPE. Mold can ruin your health.Also plywood that has gotten wet loses most of its shear strength, it also has to be replaced otherwise it can catastrophically de-laminate.
Transformers - Page 1
Forum section: electronics / general

author: Scrolljoe
author_rank: Newbie
timestamp: July 18, 2021, 01:19:30 am
content: As a senior I like tinkering with household auto transformers [ 240-110 V ] in my neck of the woods and am earnestly looking for a Correspondence Course on repairing same. Thanks for any input and be Blessed.
reprogram hoverboard with at32f403 chip - Page 1
Forum section: electronics / general

author: brnpimenta
author_rank: Newbie
timestamp: July 17, 2021, 04:18:36 pm
content: hello everyone,I have a hoverboard which I would like to reprogram it in order to control its movements. What is very challenging is that it has a at32f403 chip which is less used in the most hoverboard boards.I'm trying to reprogram it using different stuff such as st link, linux, openocd, and the tutorial in the linked below, but didn't have any progress on that.is there anyone who can help describing step by step?tutorial link:https://github.com/cloidnerux/hoverboard-firmware-hackRegarsd,Btuno O.
Short vs Long RJ45 socket? - Page 1
Forum section: electronics / general

author: nardev
author_rank: Unknown
timestamp: July 17, 2021, 11:10:54 am
content: Hey guys, i didn't use RJ45 sockets before, now i'm confused about two different lengths.Here is the first option:https://lcsc.com/product-detail/Ethernet-Connectors-Modular-Connectors-RJ45-RJ11_BOOMELE-Boom-Precision-Elec-RJ45-B-1-1_C138392.htmlAnd here is the other one:https://lcsc.com/product-detail/Ethernet-Connectors-Modular-Connectors-RJ45-RJ11_HANRUN-Zhongshan-HanRun-Elec-HR911105A_C12074.htmlThe length difference is about 6mm, i'm wondering if the first(short) one is actually 100% capable to receive any standard RJ45 Connectors or there is some other different connectors for that one?Just that

author: Benta
author_rank: Super Contributor
timestamp: July 17, 2021, 11:17:21 am
content: The first one is just a connector.The second one has built-in Ethernet magnetics.

author: nardev
author_rank: Unknown
timestamp: July 17, 2021, 11:34:41 am
content: Quote from: Benta on July 17, 2021, 11:17:21 amOu, new thing for me. Gonna learn something today. Thx mate.
Help with service manuals - Page 1
Forum section: electronics / general

author: HendoNZ
author_rank: Contributor
timestamp: July 15, 2021, 09:07:07 am
content: Hi all, I'm hopeful someone out there can help me out.I recently scored a couple of pieces of equipment;PSI MODEL A102 WAVEFORM GENERATORVENNER DIGITAL COUNTER TYPE TSA6636/2MI'm trying to locate some services manuals for them.Would love to hear form anyone about these units.Cheers

author: Andy Watson
author_rank: Super Contributor
timestamp: July 15, 2021, 10:14:10 am
content: I believe that Venner also went by the name of Malden Electronics. Some of their output was rebadged by Marconi. I think your counter is identical to the Marconi TF2414.

author: HendoNZ
author_rank: Contributor
timestamp: July 17, 2021, 10:21:47 pm
content: Thanks for the info - still hard to find a manual for that one.Cheers
Why do solder fumes always go toward your face? - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: July 12, 2021, 07:45:39 pm
content: Well, here is one guy who found the answer...

author: TimFox
author_rank: Super Contributor
timestamp: July 12, 2021, 08:30:15 pm
content: For the same reason that smoke from a barbecue grill goes towards the observer.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 13, 2021, 12:05:29 am
content: Ah, finally!Yes we have all been bothered by this. I've never done much experiment myself to understand it, but the little I did also showed this was not due to breathing, which I had assumed first. (But holding your breath quickly shows it almost makes no difference!) But I had indeed noticed fumes tended to go towards my face when my arms would get closer to the iron. Never really analyzed the cause.Of course the solution for me was to use a fume extractor. Now if you used only one arm for holding the iron, and hold the part you're soldering/or solder wire with a tool and put your other arm away, I guess this should also do. A fan or fume extractor is less trouble, though.

author: artag
author_rank: Super Contributor
timestamp: July 13, 2021, 12:52:08 am
content: Same reason bonfire smoke chases you, toast lands butter-side-down, and dropped screws crawl under a bench.Sod's law.

author: bob91343
author_rank: Super Contributor
timestamp: July 13, 2021, 04:26:10 am
content: The best way to find something you have misplaced is to buy a new one.

author: EPAIII
author_rank: Super Contributor
timestamp: July 16, 2021, 07:33:34 am
content: Dropped screws don't crawl, they JUMP under the bench. And then RUN behind a bench leg in the darkest corner.Quote from: artag on July 13, 2021, 12:52:08 am

author: EPAIII
author_rank: Super Contributor
timestamp: July 16, 2021, 07:45:43 am
content: Great explanation. I have wondered about that for many years. Thanks for the video.

author: BillyD
author_rank: Regular Contributor
timestamp: July 16, 2021, 08:11:47 am
content: Great video! And looks like a very interesting channel too.

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 16, 2021, 11:33:02 am
content: Quote from: artag on July 13, 2021, 12:52:08 amNow strap buttered toast to the back of a Cat and drop it!!!!
Small flyback transformer - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: July 28, 2021, 11:03:09 am
content: Hello, I've been looking for a transformer manufacturer to build a few small ac flyback transformer for me, the input is 12v, 30KHz and the output is 10Kv and 1mA,The smallest the better,the transformer should be around:LxWxH=32x26x24 mmNo need to have a high voltage diode.in the first step I want to order a few prototypes and the second step I need to have some hundreds of the transformer in mass production.Thanks

author: Zero999
author_rank: Super Contributor
timestamp: July 28, 2021, 02:54:53 pm
content: I don't know. My advice would be to look for new old stock CRT transformers. I doubt they still make them.Another option might be an ignition transformer.

author: jonpaul
author_rank: Super Contributor
timestamp: July 28, 2021, 05:02:20 pm
content: Bonjour, we made amny 10,000s of similar decades ago.these require vacuum varnish impreg or encapsulation as shown.Due to setup and yield, custom potting shell MOQ will be many 1000s ...10,000s.For protos or a few hundred, suggest to find a stock part eg CRT/scope/old TV replacement FB and adapt to use.Bon chance,Jon

author: xzswq21
author_rank: Frequent Contributor
timestamp: July 28, 2021, 06:04:00 pm
content: Quote from: Zero999 on July 28, 2021, 02:54:53 pmI've looked at them before on ebay, I didn't find an interesting option.The transformer should be AC, I don't need a high voltage diode at the inside of the transformer, plus their primary inductors are useless bcoz they were made for old CRT TVas I want to produce many different types of High voltage device it's better to find a transformer manufacturer.

author: daqq
author_rank: Super Contributor
timestamp: July 28, 2021, 06:17:39 pm
content: Try contacting these guys, they can make all kinds of strange and wonderful wound and potted devices/transformers:https://pvelektronic.com/en/products/potted-parts/Not gonna claim you can get exactly that, but who knows.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 29, 2021, 01:57:18 am
content: Maybe take a look at automotive ignition transformers?

author: LaserSteve
author_rank: Super Contributor
timestamp: July 29, 2021, 03:19:38 am
content: A company in the US, "Information Unlimited " still has flybacks for sale. YmMV.Steve

author: james_s
author_rank: Super Contributor
timestamp: July 29, 2021, 04:21:30 am
content: There are companies still making HV transformers. They're used for CO2 lasers, ozone generators, electronic air filters, and various other devices. There are also companies still making replacement flyback transformers for arcade monitors.

author: xzswq21
author_rank: Frequent Contributor
timestamp: July 30, 2021, 06:03:22 pm
content: Quote from: LaserSteve on July 29, 2021, 03:19:38 amI couldn't open the website.

author: LaserSteve
author_rank: Super Contributor
timestamp: July 31, 2021, 04:59:32 am
content: I just had no problem opening the website.S.
Is this seller taking doing a p.t., cashing in on Brexit or what? - Page 1
Forum section: electronics / general

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 12, 2021, 09:47:51 pm
content: Hi!This sort of nonsense has historically been mainly U. S. sellers:–https://www.ebay.co.uk/itm/TAG-101-Low-Frequency-Signal-Generator-10Hz-1MHz-Audio-Signal-Test-Generator-/393328867921?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0. . .but it suddenly seems to have caught on in Switzerland it seems!These little Wien Bridge A.F. oscillators aren't that much more on the banana boat, even if you do get import duty thrown in!(Mind you, I did buy one of those TR210 Chinese Huntron Trackers, about £254 from Aliexpress at the time I bought it, and I don't remember getting landed with duties, etc., on it!)Opinions?Chris Williams

author: Benta
author_rank: Super Contributor
timestamp: July 12, 2021, 10:09:47 pm
content: I've no idea what you're on about. Must be some very internal joke.

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 12, 2021, 10:30:28 pm
content: Hi!I was referring to the postage charges!Anybody noticed them?Chris Williams

author: Whales
author_rank: Super Contributor
timestamp: July 12, 2021, 11:28:19 pm
content: Please post a screenshot. eBay customises what it shows for every user.

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 13, 2021, 07:49:43 am
content: Hi!I wasn't making it up, honest!Chris Williams

author: vad
author_rank: Frequent Contributor
timestamp: July 13, 2021, 08:32:44 am
content: I looked at other items sold by the seller. Most come with free shipping. Have you tried reaching out the seller?

author: stevelup
author_rank: Regular Contributor
timestamp: July 13, 2021, 08:38:37 am
content: He obviously doesn't want to ship to the UK and it was easier to edit the postage price than change the list of excluded countries. I guess if you -really- want it, you can pay the £500

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 13, 2021, 07:26:48 pm
content: Hi!Buying a brand new one the same from China is under the £135 threshold for taxes and high import duties, so there's no need to buy from him – it could, as you say, be a ploy to deliberately avoid selling to the UK!As I said, I didn't have to pay a lot over the purchase price of £254 for the TR210 I bought from AliExpress!I don't know whether my Friend's v.p.n. is still available, but if it is I'll see what p & p for the same item is from France or Germany!Chris Williams

author: Benta
author_rank: Super Contributor
timestamp: July 13, 2021, 07:29:59 pm
content: No need: Germany: free shipping.

author: armandine2
author_rank: Frequent Contributor
timestamp: July 15, 2021, 04:06:02 pm
content: At £50 shipping it would make it the same price I paid for for a Kikusui 418B - online this month
Clear Lithium Grease - Page 1
Forum section: electronics / general

author: jdak907
author_rank: Contributor
timestamp: July 14, 2021, 10:12:02 pm
content: Can anyone recommend a good brand of lithium grease that is CLEAR?I've been using white lithium on some servo gears and it's been turning black after some use in the field.We've had some non-descript clear lithium grease in the shop that does not turn black.It would be nice to have some clear stuff and keep our work looking nice.Thanks!Jeff

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: July 14, 2021, 10:25:57 pm
content: The only lithium grease I've ever seen is white. I'm not even sure it's possible to make a clear lithium grease.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: July 15, 2021, 12:17:04 am
content: I don't know about any clear lithium grease, but do know that the black in most gear train grease over time is actually particulate matter (wear particles and dust and dirt) that accumulates over time. I have unused white lithium grease that is nearly five decades old and it has had very little color change over time. Originally white is is now an dark ivory color.Perhaps a filter or other means of keeping outside particles away from your gear train would help.

author: Gregg
author_rank: Super Contributor
timestamp: July 15, 2021, 12:43:31 am
content: I've seen translucent red and blue lithium greases but never clear. Synthetic grease would probably work as well or better; try Superlubehttps://www.amazon.com/Super-Lube-41160-Synthetic-Translucent/dp/B0083R1FMEit comes in tubs, tubes and bulk.The problem probably is dirt and wear particles from the gears that is turning your white grease dark and may happen with whatever grease you use.

author: Whales
author_rank: Super Contributor
timestamp: July 15, 2021, 02:46:47 am
content: Indeed clear sounds like it might be a synthetic PTFE lube.
Interesting "visual" statistics and probability site - Page 1
Forum section: electronics / general

author: DrG
author_rank: Super Contributor
timestamp: July 14, 2021, 10:11:38 pm
content: Ran across this lounging about todayhttps://seeing-theory.brown.edu/index.htmlIt's out of Brown University.There is an accompanying book that you can download (draft) for free. Be sure to check out all the different chapters with accompanying interactive graphics.It's interesting, but I need to think about it more and read more before deciding if it really is a good and valuable learning/teaching tool.I would be interested to hear what others think and I have no affiliation with the product or the authors.
Just realized my previous post was an EXACT multiple of 100. LOL - Page 1
Forum section: electronics / general

author: Ben321
author_rank: Frequent Contributor
timestamp: July 14, 2021, 03:15:15 am
content: I just looked at my profile, and noticed that (before the post I'm making here) I had exactly 600 posts. Just thought that was an amusing fact, so I'm posting it here, and attaching a screenshot.I know this is off topic for "general technical" section, but I couldn't find any "general general" section, so I figured this is the best section to post this in.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: July 14, 2021, 04:40:23 am
content: 100 posts/year.Such a chatterbox.
Here's a GUI-based keyboard remap tool for Linux which ACTUALLY WORKS - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: July 14, 2021, 06:44:58 pm
content: Folks, this actually works, unlike the plethora of "official" methods which were suggested to me,all of which failed to work.Survives reboots, and is a GUI and doesn't need messing around with rc.local, crontab editing etc:https://www.linuxuprising.com/2020/12/remap-keyboard-and-mouse-buttons-on.htmlhttps://github.com/sezanzeb/key-mapper/releasesMy K780, from Logitech, was designed so that Function keys' primary roles are MEDIA CONTROL - as to why this daft decision was made, who knows.This WORKS! I don't care what the "official" methods are/were for starting services on boot, I am sticking with this as it functions correctly. Tested on a Logitech K780 kb connected via BT to a Raspberry Pi 400 running the latest "Buster" version of Raspberry Pi OS
I've actually changed to 'Bing' !! - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 13, 2021, 01:22:40 pm
content: I've virtually only ever usedGoogle, since abandoning the likes of 'AltaVista' many years ago!!I know there are non-tracking search sites like 'DuckDuckGo', that I've played with at times, and that's ok...However, lately, I've been giving Microsoft's 'Bing' ago, though never desiring to previously!!... And I like it!I don't really care about all that 'tracking' crap anyway, and I really like the way the results are presented in Bingfor all myGraphics/Photos/Videosthat I search for! Even the Videos can 'Play' within the Bing page, without havingto jump to the source site! And manipulation of images is handled beautifully too... Am sure many are against it though!

author: themadhippy
author_rank: Super Contributor
timestamp: July 13, 2021, 01:46:25 pm
content: Must admit i prefer bings maps to google as it allows you to use the "proper" colours for road type,at least in the uk. googles roads are yellow or white and you need to zoom in to the actual road number to find the road type. Bing uses the good ole os colours,so if its blue its a motorway,green trunk road etc

author: madires
author_rank: Super Contributor
timestamp: July 13, 2021, 02:24:44 pm
content: Yep, Google maps is a UX disaster. What I strongly dislike about Bing (and MS) is that MS changes the default search setting in web browsers to Bing from time to time while installing Windows updates. This causes a strong allergic reaction on my side.

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 13, 2021, 04:25:54 pm
content: Keep in mind you will get different search results. Google is unique in it's results, for better or for worse (depends on what you search). But Bing, Yahoo, and DuckDuckGo all give the same results as each other.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 13, 2021, 05:08:13 pm
content: Changing from Google to Bing looks pretty odd to me.Google was also my go to search engine for many years - I also remember Altavista...But a couple years ago, I started to try decreasing my relying on Google tools. So, I now use alternative search engines for most searches. I occasionally use Google though - when others don't yield satisfying results. I'm just using it a lot less. Beyond not willing Google to track my every move, I started getting pretty annoyed by Google's results being much too dependant on whoever searches. Most of the time, I want "neutral" results. Not results that are supposedly tailored for me using algorithms that decide for you what you are interested in.Never been impressed by Bing. I don't use search engines much for images and videos though, so maybe it's good at this.My motto now is: don't use a single tool. Diversify!

author: SteveyG
author_rank: Unknown
timestamp: July 13, 2021, 05:14:52 pm
content: I noticed Bing is much better for electronics searches, datasheets etc. The results are either presented a lot better or they are just more accurate.
Renting test equipment in south africa? - Page 1
Forum section: electronics / general

author: JPortici
author_rank: Super Contributor
timestamp: July 12, 2021, 04:31:54 pm
content: Hello,my boss is going to south africa for the next 10 days, we are trying to find the cause of sporadic issues in our products in that region and having some equipment would be niceMore specifically, we are thinking about EMI issues (supported by the fact that we used to have problems in a specific neighborhood where they were testing 5G)My question to our SA members, do you know of places where we could rent a portable SA + Antenna for a couple of days? Specifically in the Pretoria AreaThanks!