hybridfree/eevblog-posts huggingface dataset:
irestore - Hair loss prevention that uses light therapy.   - Page 1
Forum section: electronics / general

author: Red Squirrel
author_rank: Super Contributor
timestamp: March 25, 2021, 10:00:32 pm
content: This is an actual product you can buy.https://www.irestorelaser.com/I think the "science" behind it is that certain wavelengths of light can stimulate hair growth. I don't know enough about hair loss stuff to call it BS, but it kind of smells of it.Though if it actually works... I bet a DIY version could be made for way cheaper.As a side note I have long red hair and keep getting targeted ads for hair loss, it is a bit concerning.

author: Syntax Error
author_rank: Frequent Contributor
timestamp: March 25, 2021, 10:53:51 pm
content: Men have photon hair restoration. Women have laser hair removal. Welcome to the Space Age.

author: james_s
author_rank: Super Contributor
timestamp: March 25, 2021, 11:27:06 pm
content: Well I'm not qualified to comment on whether or not light can be used to stimulate hair growth, but I will say that I'm skeptical.Thankfully I have no shortage of hair, mine grows like a weed. I feel bad for the guys I know who suffer from baldness though, I remember an acquaintance went bald on top when he was only 17. There's quite a stigma associated with that unfortunately.

author: SilverSolder
author_rank: Super Contributor
timestamp: March 25, 2021, 11:41:28 pm
content: Quote from: james_s on March 25, 2021, 11:27:06 pmI've never been attacked by so many women as I have since I started shaving my head, LOL!I'm not 17 of course, but you can probably make it work. Hard to deal with at that age.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 26, 2021, 01:23:44 am
content: A quick search shows that there's a LOT of similar devices on the market.Also looked for studies. Found this:https://pubmed.ncbi.nlm.nih.gov/27114071/You can take a look at all related articles.Whereas some of those articles tend to show a benefit, from what I've seen, meta-analysis studies seem to show that most clinic studies on this have methodology issues, so I guess all we can safely say is that it's just... unconclusive really. But at least, it *has* been studied.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 26, 2021, 03:30:23 am
content: I would buy it just for the cool hat. I'd be quite a stud this summer walking around with that thing downtown, combined with my "Ladies, I'm single" t-shirt.It probably has something to do withhttps://en.wikipedia.org/wiki/Cytochrome_P450It's not unheard of to "do things" with lasers in medicine.https://pubmed.ncbi.nlm.nih.gov/22488690/

author: AVGresponding
author_rank: Super Contributor
timestamp: March 27, 2021, 02:00:23 pm
content: Hair loss is usually as a result of follicle death, so stimulating growth would only make your remaining follicles grow hair more vigorously, if it indeed works at all.
Youtube Movies clickbait - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: March 22, 2021, 04:53:26 am
content: I am seeing Youtube videos suggestions appearing on the right hand side with all the other videos that looks to me like full movie thumnbails with the full duration. When clicked leads to a video trailer that is just a couple of minutes long. There doesn't seem to be no "Buy or Rent" on the thumbnails the actual to distinguish them.I would not buy something I can't download or "rent" to see it once and have pay to see it again for that individual video. I go to other places for that sort of thing like Netflix or Amazon Prime where I can see a whole load of them.Whether they are labelled or not as Buy or Rent not great seeing that sort of thing in the results and I already pay for Premium and don't want to see results with things I have to pay more for and possible tricked into clicking them.Amazon has a filter for what is included in prime and I see non incuded videos are labelled accordingly.

author: Haenk
author_rank: Super Contributor
timestamp: March 24, 2021, 01:53:15 pm
content: Just checked - in Germany, the movie appears with a really huge "KAUFEN ODER AUSLEIHEN" (that's "BUY OR RENT") button on the top of the list, then again with a smaller button in different color with (again) "KAUFEN ODER AUSLEIHEN" further down the list. Plus a couple of other buy/rental movies.Probably a matter of advertising standards (EU/German versus UK standards?).So for me, this is not misleading, but annoying for sure.

author: ledtester
author_rank: Super Contributor
timestamp: March 24, 2021, 03:40:49 pm
content: I have YT Premium and I used to get suggestions from the Youtube Movies channel but not anymore. Can't remember exactly what I did but it could be a combination of:- training the Algorithm- telling YT I'm "not interested" or to "don't recommend this channel" when given the opportunity to on the YT home page
Unlimited Power from Graphene and Brownian Motion - Page 1
Forum section: electronics / general

author: srruhl3701
author_rank: Newbie
timestamp: October 02, 2020, 09:30:51 pm
content: https://phys.org/news/2020-10-physicists-circuit-limitless-power-graphene.htmlAccording to Kumar, the graphene and circuit share a symbiotic relationship. Though the thermal environment is performing work on the load resistor, the graphene and circuit are at the same temperature and heat does not flow between the two.That's an important distinction, said Thibado, because a temperature difference between the graphene and circuit, in a circuit producing power, would contradict the second law of thermodynamics. "This means that the second law of thermodynamics is not violated, nor is there any need to argue that 'Maxwell's Demon' is separating hot and cold electrons," Thibado said.

author: Gyro
author_rank: Super Contributor
timestamp: October 03, 2020, 07:48:33 pm
content: err...https://www.eevblog.com/forum/dodgy-technology/physicists-build-circuit-that-generates-clean-limitless-power-from-graphene/EDIT: Actually it looks as if you were there first and Dave posted without reading yours!

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 04, 2020, 06:55:50 am
content: Quote from: Gyro on October 03, 2020, 07:48:33 pmYes, but we shant call our master out on reposting.

author: bson
author_rank: Unknown
timestamp: October 17, 2020, 08:43:38 pm
content: Just don't short the 'unlimited' power terminals or the infinite instantaneous current will end the universe.

author: anovickis
author_rank: Contributor
timestamp: February 26, 2021, 09:15:52 pm
content: I wonder if you can put a load on this generated AC or it just exists because they didn't ground the scope probe with which the measurements are taken.I can go one simpler - all I have to do is turn up the sensitivity on the scope, and I have power from the air, who needs the graphene.

author: Refrigerator
author_rank: Super Contributor
timestamp: February 28, 2021, 11:49:10 am
content: Quote from: anovickis on February 26, 2021, 09:15:52 pm"Woah, what's this mysterious 50Hz voltage appearing on my scope probe, have i discovered unlimited power?!?!" is probably what you'd expect people like that to believe.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 28, 2021, 04:52:20 pm
content: Would the University of Arkansas have sunk so low though?
Stopcor ICCP for Heating Systems - Page 1
Forum section: electronics / general

author: Black Thorn
author_rank: Newbie
timestamp: February 23, 2021, 01:57:55 pm
content: Seems "sound in practice" they do cite some actual factual information on the site however after looking at ships implementations of these devices comparing their product and some of the claims such as limescale prevention through Brownian motion, I'm sceptical to say the least.Seems like common sense if it was this simple, everyone would already be doing it. Applying a galvanic cell's electrical charge to a pipe. (Is the wall even a good enough ground)Thoughts?https://stopcor.co.ukhttps://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018011608&tab=PCTBIBLIO

author: AVGresponding
author_rank: Super Contributor
timestamp: February 23, 2021, 06:56:31 pm
content: Sacrificial anodes (cathodic protection) are a thing and have been for a very long time. Not sure how easy it would be to implement inside a domestic heating system though...https://en.wikipedia.org/wiki/Galvanic_anode

author: Black Thorn
author_rank: Newbie
timestamp: February 23, 2021, 10:54:32 pm
content: That it basically what I'm getting at, I understand how the "zincs" on boats function. They have a common electrolyte however isn't that a requirement? I've not seen a single diagram without a common electrolyte for this type of protection? (sacrificial anodes)(Edit: Sacrificial Anodes are used in water heaters and are quite common place and they reside inside the water tank this works on the same principle as the zincs welded / fastened onto a boat hull)This device also doesn't claim to function how zincs work, the output is a voltage / current from the cell you create when adding the electrolyte (tap water) to the device, which is then applied to the pipe through a conductor which is suppose to impress a current and make the differential as close to equal between the two dissimilar metals (making the anode more noble and turning it cathodic) which mitigates the galvanic corrosion process? Or am I missing something here?But when you look at the diagrams for commercial ICCP units they all have a common electrolyte with the ICCP anode (usually a very noble metal) within the same electrolyte as the normally cathodic metal and the more anodic metal which you're trying to protect.They also have monitoring systems actively giving feedback so it provides the correct amount but I'm overlooking that part for now for simplicity.This is a good source I've found on it so far.https://www.marineinsight.com/tech/hull-corrosion-and-impressed-current-cathodic-protection-iccp-on-ships-construction-and-working/
Another dodgy USB charger.  - Page 1
Forum section: electronics / general

author: bd139
author_rank: Super Contributor
timestamp: December 28, 2020, 11:26:46 am
content: Got this with a digital camera kit. Found some interesting design aspects.Firstly it appears there is no feedback mechanism between the primary and secondary at all that I can see. Or any voltage regulation on the secondary. I suspect it’s using the ratio of the transformer and doing feedback on primary. Hmm. It does output 5.8v out of the box which is more than a little high. I don’t have a load handy to check it.Secondly, clearly there is a problem in the factory with them blowing up from poor soldering and manufacturing tolerances because someone nearly scored around pads of the board around the transformer primary and the IC with a scalpel. First time I’ve seen that oneSaving grace is there is actually quite a lot of clearance between primary and secondary. No slots cut though.Gore attached.

author: magic
author_rank: Super Contributor
timestamp: December 28, 2020, 11:38:10 am
content: Quote from: bd139 on December 28, 2020, 11:26:46 amIt's common in miniature USB chargers. I suppose it's good enough given a transformer with high enough coupling.Another annoying feature found in USB chargers is "cable resistance compensation", i.e. the chip knows nothing about the cable but it raises its output voltage proportionally to load according to some designer's guesstimate.Quote from: bd139 on December 28, 2020, 11:26:46 amLess common

author: Dennis Frie
author_rank: Contributor
timestamp: January 09, 2021, 09:50:48 am
content: I guess the 5.8V is measured unloaded? It's not unusual to see significant voltage-variations depending on load, if the output is not regulated directly. Flyback converters are great for making multiple outputs (in this case probably just an output to drive the primary side and the 5V secondary output). However, voltage tracking between outputs depends a lot on the transformer design and it will never be perfect.Primary side regulation is a cheap way to design, but far from ideal.The "cuts" in the PCB however, seems like a really bad idea. Those USB-chargers from China is pretty much a lottery.

author: David Hess
author_rank: Super Contributor
timestamp: January 09, 2021, 01:06:38 pm
content: Primary side feedback is possible with a flyback converter:https://www.analog.com/en/technical-articles/primary-side-sensing-takes-complexity-out-of-isolated-flyback-converter-design.html

author: SmokedComponent
author_rank: Regular Contributor
timestamp: February 01, 2021, 04:31:09 pm
content: Wow, those cuts I sometimes do on my protoboards. Never seen it in a commercial product.They have an extra assembly step and line workers to do those cuts...must be an expensive, premium product
"Hi-end" branded abomination power supply - Page 1
Forum section: electronics / general

author: Porama6400
author_rank: Regular Contributor
timestamp: February 01, 2021, 06:08:52 pm
content: This abomination of a power supply cost me 20 USDWorst one I've ever got my hand on yet.The Kapton tape below the circuit board was placed by me, There's no insulation below it out of the box.I can't attach all images here, so here's the resthttps://imgur.com/a/gxoVfoDEDIT: forgot to mention, AC input solder joint is about 1.3mm over the metal case, no insulation plastic sheet whatsoever.

author: thm_w
author_rank: Super Contributor
timestamp: February 01, 2021, 09:48:17 pm
content: Ah yes AC right next to 12V output, brilliant.Is it actually using a TOP224C chip, those are not that cheap. Also the tab is connected electrically, and I'm not seeing any sort of proper insulation in place to prevent it making contact with the case.Whoever designed it appears to have some knowledge but not much safety wise, do you think it is a Thai design?

author: Porama6400
author_rank: Regular Contributor
timestamp: February 02, 2021, 02:22:04 am
content: Interestingly, they actually use TOP224I don't have a proper macro lens, but here you goThere are nothing to prevent contact between AC join and case whatsoever.For the country of origin, I am not so sure. They never mention it.The black caps are AiSHi branded and the dark blue one is Elite branded.

author: thm_w
author_rank: Super Contributor
timestamp: February 02, 2021, 10:28:09 pm
content: At 20W I wonder if you would be better off with something like surplus wall wart supplies. Just that connecting to them might not be simple if you want it in an enclosure.I would send you some quality 12V meanwell units but the shipping price is likely going to be too high.

author: Porama6400
author_rank: Regular Contributor
timestamp: February 03, 2021, 11:45:55 am
content: Quote from: thm_w on February 02, 2021, 10:28:09 pmNo worries! I've got a Meanwell power supply.at least I don't have to worry that it will burst into flame while I'm asleep.

author: jancumps
author_rank: Unknown
timestamp: February 03, 2021, 12:19:52 pm
content: The text looks Malaysian.
PARADIGM SHIFTERS - Page 1
Forum section: electronics / general

author: Terry Bites
author_rank: Super Contributor
timestamp: January 26, 2021, 12:24:21 pm
content: You can make any impossible tech work if you (or those conspiring against you) shift your paradigm.Pigs do fly- I just refuse to acknowledge the possibility and my denial is holding the entire human race back.Be safe and don't drink bleach!

author: Ian.M
author_rank: Super Contributor
timestamp: January 26, 2021, 01:40:34 pm
content: https://www.wsj.com/articles/when-pigs-fly-they-want-drinks-leg-room-11605022688

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 27, 2021, 05:18:48 pm
content: Quote from: Ian.M on January 26, 2021, 01:40:34 pm
KS: MewNu's Energy Harvesting Device - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 14, 2021, 09:06:32 am
content: https://www.kickstarter.com/projects/mewnu1/mewnus-energy-harvesting-deviceQuote

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: February 14, 2021, 09:36:17 am
content: Before you spend any money on that, I have a bridge to sell you.

author: AVGresponding
author_rank: Super Contributor
timestamp: February 14, 2021, 11:23:44 am
content: Keywords checklist:Quantum energy - checkNano antennae - checkResonance frequency - checkMeta surface - checkCosmic energy - checkUnlimited clean energy - checkBonus Keywords:NebulaePulsars !Missed Keywords:Carbon nanotubesFractal geometryZero point energyIf there's no carbon nanotubes, I'm out, sorry.

author: Cyberdragon
author_rank: Super Contributor
timestamp: February 14, 2021, 11:52:24 pm
content: Nah I'm all in for a ZPM

author: EEVblog
author_rank: Unknown
timestamp: February 15, 2021, 08:31:13 am
content: Quote from: AVGresponding on February 14, 2021, 11:23:44 amHuge oversight in today's crowded Kickstarter scam space.

author: Syntax Error
author_rank: Frequent Contributor
timestamp: February 15, 2021, 11:49:26 am
content: Add "flux capacitor" to that list.Lead as the 'switch'? Have they heard of RoHS?Code:Pledge AU$ 35 or more [get a] Dancing Flower A dancing flower powered by our energy harvesting device. Non stop dancing, even in the dark.

author: CJay
author_rank: Super Contributor
timestamp: February 15, 2021, 01:30:55 pm
content: Quote from: AVGresponding on February 14, 2021, 11:23:44 amIs blockchain no longer fashionable as a scam buzzword?
Why yes, you can wear radioactive stuff! - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: January 20, 2021, 01:06:04 pm
content: For fcks sake! At least the normal bullshit was harmless, if expensive. Now it's actually radioactive!

author: Yansi
author_rank: Super Contributor
timestamp: January 20, 2021, 01:36:25 pm
content: Old news.There ale already threads with this.//EDIT: For example, this one:https://www.eevblog.com/forum/dodgy-technology/negative-ion-crap-actually-radioactive/(and probably other threads).

author: peterlewis
author_rank: Newbie
timestamp: January 23, 2021, 09:15:18 am
content: OMG! Are these guys planning a Weapon of Mass Destruction?? And are people really really going for these crap???
finally revealed: Covid 5G Vaccine Nanochip - Page 1
Forum section: electronics / general

author: HB9EVI
author_rank: Frequent Contributor
timestamp: January 06, 2021, 11:48:42 am
content: We all already knew it: the real aim of the Covid vaccine is to implant us Nanochipsthis fabulous website finally reveals the facts about the nature of that chip, including a schematic:https://telegra.ph/ATTENZIONE---VACCINO-12-27although I'm rather surprised that the good ol' TL072 is now a very expensive military chip.

author: Zero999
author_rank: Super Contributor
timestamp: January 06, 2021, 01:51:58 pm
content: Is this a joke, or genuine conspiracy bollocks? No, there are no chips in any vaccine.

author: enjoy.cowboy
author_rank: Contributor
timestamp: January 06, 2021, 02:24:19 pm
content: Nah, its a joke. If you look at the schematics, its just a bunch of amplifiers. Even the text is poking fun at it. This particular circuit is well known among guitar players as the "boss metalzone" distortion effect . I mean, sure, go try to generate a milimiterwave carrier with an RC oscillator connected to a TL072

author: magic
author_rank: Super Contributor
timestamp: January 06, 2021, 02:26:02 pm
content: Quote from: HB9EVI on January 06, 2021, 11:48:42 amIt's not your grandpa's TL072, it's a bare die nano-TL072 that they integrate on a hybrid with thin film resistors and MEMS electrolytic capacitors that's still small enough to pass through a needle. State of the art technology.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 06, 2021, 03:38:03 pm
content: https://www.eevblog.com/forum/dodgy-technology/guitar-pedal-schematic-mistaken-as-5g-implant-in-covoid-vaccine/

author: phil from seattle
author_rank: Super Contributor
timestamp: January 06, 2021, 04:53:42 pm
content: How do they hook up the foot switch?

author: HB9EVI
author_rank: Frequent Contributor
timestamp: January 06, 2021, 05:05:32 pm
content: Quote from: SiliconWizard on January 06, 2021, 03:38:03 pmupps, didn't see that one; sorry for double postingit's actually the schematic from the Boss Metal-zone stompbox

author: Simon
author_rank: Unknown
timestamp: January 06, 2021, 07:06:03 pm
content: i better move this to another section before it gets taken seriously by the next conspiracy googler.

author: SilverSolder
author_rank: Super Contributor
timestamp: January 06, 2021, 09:55:48 pm
content: Quote from: Simon on January 06, 2021, 07:06:03 pmhttps://en.wikipedia.org/wiki/Poe's_law

author: EEVblog
author_rank: Unknown
timestamp: January 06, 2021, 11:15:42 pm
content: Quote from: HB9EVI on January 06, 2021, 05:05:32 pmThat's one hell of an injection!
WiFi Router Guard (Blocks About 90% of WiFi Router EMF!) Blocks 5G! - Page 1
Forum section: electronics / general

author: dropkick
author_rank: Contributor
timestamp: December 07, 2020, 08:03:32 pm
content: Oh boy.... this is wonderful!https://www.amazon.com/Router-Guard-Large-WiFi/dp/B07MXD75TRThere's one for your smart meter too!https://www.amazon.com/Smart-Meter-Guard-Radiation-Shield/dp/B00OVJCPS6

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 08, 2020, 05:12:56 am
content: Quote from: dropkick on December 07, 2020, 08:03:32 pmIf that actually did anything, that would be illegal.

author: MrMobodies
author_rank: Super Contributor
timestamp: December 08, 2020, 05:15:11 am
content: Quote from: dropkick on December 07, 2020, 08:03:32 pmI remembered I had something that looked very similar to that for draining cutlery.Looks like this stuff belongs in a kitchen.I question, if they don't want Wifi why don't just switch it off from the router.Joke: This one must be some kind of strainer for a pot:https://www.amazon.com/Smart-Meter-Guard-Radiation-Shield/dp/B00OVJCPS6It looks to me like an industrial sieve for frying missing a handle see picture.Kitchen Accessories Mini Round Fries Basket Oil Strainer Fries Chef Kitchen Basket Frying Net Colander 8CMhttps://www.alibaba.com/product-detail/Kitchen-Accessories-Mini-Round-Fries-Basket_62253192317.htmlMaybe I should ask questions on the listing like where is the handle and what size frier was it supposed to fit.QuoteActuallyit did exactly what it was suppose to do.So it blocked the 5G signal from getting to the meter when it is put over it as it would do and yet they gave it a 1 star for working.

author: Haenk
author_rank: Super Contributor
timestamp: December 08, 2020, 10:38:12 am
content: I do actually see some use for the Router cage, to reduce the effective output and limit the reach to something like the same room.Some router allow you to adjust power output, but most don't.However the meter cage will likely bring you trouble. I'm sure the service providers will call it "manipulation device", and a nice little fine will follow.

author: PlainName
author_rank: Super Contributor
timestamp: December 10, 2020, 02:02:02 am
content: QuoteShill, drumming up sales from people who think they can get free electricity. Lack of a signal would prevent the electricity company reading the meter but it wouldn't show a reduction in usage. Best case, they 'estimate' until they can get a proper meter reading, and then you get a big bill which is the different between the estimate and actual usage.
Tired of water from air? Try water from trash. - Page 1
Forum section: electronics / general

author: Raj
author_rank: Frequent Contributor
timestamp: December 13, 2020, 10:30:43 am
content: Skysource WEDEW just showed up as time's list of 100 best inventions-https://time.com/collection/best-inventions-2020/5911413/wedew/

author: Haenk
author_rank: Super Contributor
timestamp: December 14, 2020, 09:54:26 am
content: If you have a fully overgrown landscape, a well will likely be the best solution.This nonsense is just nonsense - how much water do they expect to extract from dry grass or rock-hard nutshells?
Wondering what the voltage on this PEMF machine is - Page 1
Forum section: electronics / general

author: wirehead_freenode
author_rank: Contributor
timestamp: November 17, 2020, 05:03:01 pm
content: Is this really 990V? Given that the plug voltage is 120V.And, what would putting 1 more 220/400V capacitor and rectifier yield, voltage-wise? My aim is around 1100V. Maybe 1200V.

author: srb1954
author_rank: Super Contributor
timestamp: December 30, 2020, 09:36:48 pm
content: Yes, given sufficient time for the caps to charge to their full voltage. An additional stage would further boost the output voltage but at the expense of further extending the time to charge up to full voltage.This is anabsolutely lethalcircuit andextreme careshould be taken with it. The whole circuit should be enclosed in a suitable box with 2 safety interlock switches on the cover to both disconnect the mains supply and discharge the main capacitor through a lower value bleeder resistor, say 10k100W.With only the 1Megbleeder resistor shown the main reservoir capacitors could potentially retain sufficient charge to deliver afatal shockfor over an hour after the mains is disconnected. It would be better to place additional bleeder resistors of say 47k2W across each of the 7500uF capacitors. This would help equalise the voltage sharing across the 4 capacitors and provide a faster safety discharge. Even so, in the absence of an additional door interlock discharge circuit, the main capacitor could still deliver a fatal shock for up to 10min after the power is disconnected.

author: Harfner
author_rank: Contributor
timestamp: January 04, 2021, 03:07:58 pm
content: Look for "villard cascade" for an explanation on how it works. That was often used in CRTs for high voltages generation.BUT: Donotdo it the way shown in the schematic. Aside from the insufficient bleeder resistors, the circuit is wired to mains without anything limiting power consumption. This gives you a good chance to burn up your lab in addition to electrocuting yourself.What are you trying to achive? (There are ways to produce 1200V, even from a small battery)
Defective or Dodgy Holiday Lights - Page 1
Forum section: electronics / general

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 08, 2020, 11:43:43 pm
content: In the style of Big Clive, a thread for this year's dodgy electrical ornaments.My find:My mother bought a set of no-name incandescent lights from the discount store Family Dollar, when I went to put them up, two bulbs already blew on plugging it in.One of them looked quite burnt already and upon inspection I found thisEDIT: The embeds are as dodgey as that bulb...

author: Haenk
author_rank: Super Contributor
timestamp: December 09, 2020, 09:55:46 am
content: For 2.75 USD you are getting 100 bulbs, mounts, cable, plug and a box. What do you expect it to be? Rhodium-plated connectors and burned-in long-life components?Usually they come with a couple of spare bulbs, for a reason (reason = get it to work without returning it to the shop for a couple of weeks. Once you tossed the receipt, the sales mission is completed...)
Vegan friendly 20 gram portable air purifier / negative ion generator - Page 1
Forum section: electronics / general

author: v81
author_rank: Regular Contributor
timestamp: December 07, 2020, 12:47:47 pm
content: Product..https://www.scorptec.com.au/product/health/air-purification/84269-airvida-m1-bkIf it looks like, smells like.... probably is?Not knowledgeable enough to be sure but this 'Vegan' friendly portable ion generator for the low, low sum of AUD$299 has a funny smell to it, and not the negative ions.Curious what other might think and might learn a thing or 2.

author: daqq
author_rank: Super Contributor
timestamp: December 07, 2020, 01:37:16 pm
content: You aren't asking the important questions - is it free range and gluten free?

author: CJay
author_rank: Super Contributor
timestamp: December 07, 2020, 01:58:34 pm
content: It's failed at the first hurdle for me, I'm allergic to nutjobs.

author: jmelson
author_rank: Super Contributor
timestamp: December 11, 2020, 06:56:59 pm
content: Wait a minute! Its WEARABLE??!!?? I have an ion generator, and it throws tiny sparks! I sure as hell would never WEAR the thing!Jon

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 12, 2020, 06:31:46 am
content: Quote from: jmelson on December 11, 2020, 06:56:59 pmThe current is tiny, it's not a stun gun, probably less of a shock than a piezo ignitor. Also, as long as it's shielded you can't touch the electrode(s) anyway.
Pokit PRO is just too hot to handle. - Page 1
Forum section: electronics / general

author: Haenk
author_rank: Super Contributor
timestamp: November 11, 2020, 01:28:45 pm
content: I think this pushes the "Pro" right into the "Dodgy technology" region.https://www.kickstarter.com/projects/pokitmeter/pokit-pro/posts/3011456Holding a 50oC+ item in your hand might be "within allowed specs", but honestly, that's just

author: Kean
author_rank: Unknown
timestamp: November 11, 2020, 01:57:29 pm
content: Realistically who is going to use a meter like this to measure high currents for more than a few seconds?OK, I'm sure someone will... even if it looks inconvenient. And that is why the testing standards exist.

author: thm_w
author_rank: Super Contributor
timestamp: November 12, 2020, 08:24:24 pm
content: Many handheld DMMs have limits on using the 10A range for a certain amount of time, although its probably mostly accuracy issue than safety.Just say 10A for 10s max and be done with it, as Kean said no one should be using it for that purpose.

author: janoc
author_rank: Super Contributor
timestamp: November 12, 2020, 09:20:29 pm
content: Quote from: thm_w on November 12, 2020, 08:24:24 pmActually not - on many cheap meters the 10A range is unfused and the shunt will literally melt the case/desolder itself from the board if you try to measure 10A for longer than a few seconds.

author: NichPokit
author_rank: Newbie
timestamp: November 12, 2020, 10:57:31 pm
content: Hi, I'm one the engineers working on Pokit Pro.Kean is right, the product will not be rated for continuous 10 Amp measurements, and the labelling on the unit will reflect this.The 50C was the maximum temperature in a worst-case scenario where a user ignores all the warnings and labels and leaves it connected for hours. We were just making sure the unit wouldn't melt or have any components desolder themselves even if it's abused.
Battery swaps from NIMH to Lithium on old hybrid cars - Page 1
Forum section: electronics / general

author: donbright
author_rank: Newbie
timestamp: October 13, 2020, 11:17:58 pm
content: Apparently Honda Insight automobile owners have been experimenting with swapping out old Nickel Metal Hydride packs for Lithium batteries in their cars, and some Prius owners have been trying this too.The incentive is that the first and second gen Prius packs are now beginning to die in big numbers, but a replacement new NiMH pack for Prius is typically over $2000.00 from Toyota, or about $1600.00 for aftermarket new (and then there is $900 "rebuilt" aftermarket but that's a separate argument). This is all for a pack that is about 1.3 Kilowatt hours of capacity, and you can buy 1.3kwh capacity of new Lithium for much less than that.The Prius Chat forum has been rather dubious of these conversions, because the BMS is often not replaced and the Toyota computer is designed around the behavior of NIMH not Lithium.I was wondering what EEVBlog forum thinks. Here is a good example of the idea, a direct swap of the NIMH for Lithium.
"Solar road" funding project in Germany - Page 1
Forum section: electronics / general

author: Haenk
author_rank: Super Contributor
timestamp: September 29, 2020, 10:04:31 am
content: This is a german TV show; entrepreneur try to sell a part of their company for an investment.Of course, this project is dodgy, and all investors declined the offer.In German only, sorry:https://www.focus.de/finanzen/news/unternehmen/die-hoehle-der-loewen-solmove-baut-solar-strasse-die-geld-verdient-bekommt-der-gruender-einen-deal_id_12481648.htmlWebsite (English available, too):https://www.solmove.com/

author: thinkfat
author_rank: Unknown
timestamp: September 29, 2020, 11:17:30 am
content: Solmove was the company behind the solar bikeway in Erftstadt. The one that spectacularly went up in smoke.

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 30, 2020, 05:18:44 pm
content: This will just never end!

author: AVGresponding
author_rank: Super Contributor
timestamp: September 30, 2020, 09:04:19 pm
content: Well, it isrenewableenergy...

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 01, 2020, 05:40:37 am
content: Quote from: AVGresponding on September 30, 2020, 09:04:19 pmRenewable bullshit...I'd rather just use a cow for that
World's first "wireless NPK sensor"? - Page 1
Forum section: electronics / general

author: JimRemington
author_rank: Regular Contributor
timestamp: September 28, 2020, 03:46:40 pm
content: Teralytic is a new startup which claims to have developed the first ever wireless NPK sensor for agriculture. As many of you know, soil chemistry is complex and analyzing soils for nitrogen, phosphorous and potassium content is done in the lab by chemists who use different techniques for each component and for different soils. Since an inexpensive NPK sensor could revolutionize agriculture in many nations, it would be of intense interest.There don't seem to be any sensor specs or operational details on Teralytic's web site, nor could I find independent scientific reviews of the NPK probe performance under typical use cases. A quick search turned up only advertising and ag news stories.I suspect a scientific review won't happen soon, because the Teralytic NPK sensor is available only on lease, at USD 1100 for one sensor, for one year. The user is required to upload all their data to Teralytic servers, it is forbidden to send the raw data anywhere else and finally, Teralytic canmodify the data at will, even before the user sees it.From the license agreement:Quotehttps://teralytic.com/device-lease-data-upload-agreement.htmlThis entire operation does not pass my briefest sniff test.

author: Stray Electron
author_rank: Super Contributor
timestamp: September 28, 2020, 07:11:51 pm
content: Quote from: JimRemington on September 28, 2020, 03:46:40 pmI agree. Farmers. growers and the people that would be interested in this need multiple sensors in their fields and they need reliable, accurate (read "untampered with") numbers. This system is too limited, too expensive and too untrustworthy. Add, that I don't see being "wireless" as a significant advantage. especially not at this price!

author: JimRemington
author_rank: Regular Contributor
timestamp: September 28, 2020, 09:04:16 pm
content: I sent the info to a chemist friend who works on developing biological sensors. Here are his very interesting and enlightening comments.Quote
Powervolt - Page 1
Forum section: electronics / general

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: September 17, 2020, 11:46:00 am
content: I saw this 'interesting' link on a web site the other day.https://globalmoneysaving.com/powervolt/index.html?cli=54807813Seems I can save 90% off my electricity bills but the power companies don't want us to know about it! /sRead and weep

author: newbrain
author_rank: Super Contributor
timestamp: September 17, 2020, 12:41:18 pm
content: In what surely cannot be ascribed other than to pure coincidence, their wonderful contraption uses the very same enclosure as this:

author: madires
author_rank: Super Contributor
timestamp: September 17, 2020, 01:14:05 pm
content: As usual, it's simply a film cap with a few µF and an LED indicator light. And since not many know that the power company bills households just for effective power and that you won't save anything by using that scam crap, some fraudsters are trying to rip off people.
New Zealand To Test Wireless Power Transmission - Page 1
Forum section: electronics / general

author: nuclearcat
author_rank: Unknown
timestamp: September 10, 2020, 08:06:02 am
content: Wondered if this already surfaced herehttps://hackaday.com/2020/09/10/new-zealand-to-test-wireless-power-transmission/And it seems i'm first!I'm sure @eevblog will be interested

author: Kean
author_rank: Unknown
timestamp: September 10, 2020, 08:26:06 am
content: First what?This has already been mentioned in a at least 3 previous dodgy tech forum threads.https://www.google.com/search?q=emrod&sitesearch=www.eevblog.com

author: nuclearcat
author_rank: Unknown
timestamp: September 10, 2020, 08:35:44 am
content: Well, seems i was too sleepy to read all topics well. Sorry

author: 0culus
author_rank: Super Contributor
timestamp: September 10, 2020, 04:18:47 pm
content: It is worth noting, despite prior threads here, that this story also showed up on Hacker News, and the founder of Emrod has been rather defensive and deflecting of pointed technical questions in the comments. It's quite hilarious.https://news.ycombinator.com/item?id=24422897

author: Kean
author_rank: Unknown
timestamp: September 10, 2020, 04:24:31 pm
content: Interesting - but your link was broken.https://news.ycombinator.com/item?id=24422897

author: Nusa
author_rank: Super Contributor
timestamp: September 10, 2020, 04:50:42 pm
content: The Sun does wireless power transmission every day. Just put your solar panels out to collect it.
Snapistor - Anyone ? - Page 1
Forum section: electronics / general

author: goaty
author_rank: Regular Contributor
timestamp: August 22, 2020, 11:30:27 am
content: Just got this curious Resistors off eBay, maby worth sending to the Mailbag.

author: daqq
author_rank: Super Contributor
timestamp: August 22, 2020, 01:03:43 pm
content: Well, it worked. This is similar, although less violent:https://www.element14.com/community/videos/18448/l/precision-centers-express-delivery-of-custom-resistor-values-demo-video-vfrTrimming/setting resistors for custom values by hand.

author: Ian.M
author_rank: Super Contributor
timestamp: August 22, 2020, 03:18:15 pm
content: They are mentioned in the PARIS Components SHOW (Salon International des Composants Electroniques 1978) report by David GibsonQuote from: Practical Wireless, August 1978, page 44

author: thm_w
author_rank: Super Contributor
timestamp: August 25, 2020, 09:04:11 pm
content: That broken ceramic could be very sharp and nasty... if you've ever cracked open a ceramic fuse you'll know.

author: AVGresponding
author_rank: Super Contributor
timestamp: August 26, 2020, 07:36:18 pm
content: Quote from: thm_w on August 25, 2020, 09:04:11 pmGiven the conductive properties of blood, this could help with fine value trimming...

author: mzzj
author_rank: Super Contributor
timestamp: September 05, 2020, 07:32:12 pm
content: Damn, now I finally have name for those!I remember reading about them 20-30 years ago in some book or trade magazine but wasn't able to find any reference to them when I was looking at it few years ago. I thought that I must have been dreaming.

author: niconiconi
author_rank: Frequent Contributor
timestamp: September 10, 2020, 07:26:35 am
content: QuoteSo it's basically a special resistor designed for easy trimming? It reminds me of the 1979 National Semiconductor application note on cutting parallel/series resistor arrays as a cheap (and safer...) alternative to potentiometers for LDO voltage trimming.https://www.ti.com/lit/an/snva582/snva582.pdf
Nuclear Diamond? No details. Smells like shit.  - Page 1
Forum section: electronics / general

author: afourtrackmind
author_rank: Contributor
timestamp: August 26, 2020, 05:07:14 pm
content: https://newatlas.com/energy/nano-diamond-self-charging-batteries-ndb/?fbclid=IwAR1vGQIT8WHHdaEKb8Jsvno9Q5rnCVizY22wG8oD7Xd4e61h0UAWbHwRJ8oNo actual details, just looks like a bunch of distractions. Can anyone else make heads or tails of this?

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 27, 2020, 02:17:44 am
content: It's overhyped BS. They're just weak beta cells that can just about keep an RTC running and that's it. I mean they played themselves by showing the model...100uW...yeah, that's about right, ain't gonna charge your phone let alone power a house.https://www.eevblog.com/forum/dodgy-technology/does-anyone-make-serious-studies-about-a-tritium-soloar-cell-batterie/

author: afourtrackmind
author_rank: Contributor
timestamp: August 27, 2020, 11:17:24 pm
content: Thank you. Im no dummy, however this language is beyond my education level and I don't have the time to read up yet.Just catching Dave's video now.

author: Haenk
author_rank: Super Contributor
timestamp: August 28, 2020, 06:35:23 am
content: With all those claims I'd put this into the usual "BS bin".A lifetime of a decade? Well, you could simply use a Lithium coin cell. I have plenty of devices with a Lithium coin cell that still delivers enough power after more than 30 years...

author: Labrat101
author_rank: Unknown
timestamp: August 28, 2020, 12:36:56 pm
content: Quote from: Cyberdragon on August 27, 2020, 02:17:44 amI reckon a lemon with a copper & Iron nail would be for functional and produces more power .for SMD version lice into small slices and use how ever many leg required . Hot snot to stop it drying out or leakingBTW there is a USB version as well Plug you lemon into any port.

author: MrMobodies
author_rank: Super Contributor
timestamp: August 28, 2020, 09:34:14 pm
content: Quote from: afourtrackmind on August 27, 2020, 11:17:24 pmWhen I find the wording is in such a way like that I can't understand, I'd lookup the words and context and when I understand it, most of the time I find it is just bullshit dressed up as something that looks complicated using varied words and misleading statements.The stock photos are usually give away when doing image lookup but in this case it looks like they forgot about the 100uw/microwatts.

author: Labrat101
author_rank: Unknown
timestamp: August 28, 2020, 09:58:54 pm
content: Quote from: afourtrackmind on August 26, 2020, 05:07:14 pmThey have so much waste radioactive rubbish they want us to have it in our homes andso we all die of the nuke waste and the virus so they can take over the worldand make money doing so ..

author: bson
author_rank: Unknown
timestamp: September 03, 2020, 10:35:44 pm
content: It really depends on how much power it can generate for a given volume and price. I don't think anyone wants an 80s era sized brick for a phone priced at $250,000 just so they won't have to charge it.
Rip off JBC soldering iron. - Page 1
Forum section: electronics / general

author: JohnWW
author_rank: Contributor
timestamp: August 22, 2020, 06:42:23 am
content: Has anyone done a un-boxing tare down of a chinese JBC soldering? Samething like:https://www.alibaba.com/product-detail/BEST-933B-New-High-JBC-Precision_62409127317.html?spm=a2700.galleryofferlist.0.0.21805ba3JlMyZGThanksJohn

author: Haenk
author_rank: Super Contributor
timestamp: August 25, 2020, 07:11:46 am
content: Youtube test is not too hard to find:In short: Pretty well built, works fine too.However supporting a blatant chinese ripoff? Erm, no.

author: Fixed_Until_Broken
author_rank: Regular Contributor
timestamp: August 29, 2020, 09:59:58 pm
content: Only thing I want to know is if the handle is the same? I have real JBC but I only have 210 handle I want a 245 handle also. but the are like $90-70 on ebay. I don't really need the 245 but I want it.
Reverse solar panels - Page 1
Forum section: electronics / general

author: Rx7man
author_rank: Regular Contributor
timestamp: August 26, 2020, 11:30:10 pm
content: https://www.thesun.co.uk/tech/9036304/reverse-solar-panels-generate-electricity-night-sky/I'm waiting for the kickstarter on this one.. 64nW/m^2.. it's definitely going to be a revolution!

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 27, 2020, 02:26:01 am
content: QuoteWhat's this "atmosphere" thing in the way?Gotta be careful of those lunar panels...they'll turn you into a wererabbit.

author: amyk
author_rank: Super Contributor
timestamp: August 27, 2020, 03:11:20 am
content: I thought the title was referring to LEDs.

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 27, 2020, 04:12:23 am
content: Quote from: amyk on August 27, 2020, 03:11:20 amTechnically, you can light up a solar panel, it's just really weak.

author: srb1954
author_rank: Super Contributor
timestamp: August 27, 2020, 08:39:31 am
content: Excellent, I could use this technology to power my home.There is just the small problem of finding a suitable area for the panels. An installation covering a small country like Liechtenstein should be large enough to supply the power needs for my house and even leave a bit over for my neighbour's house.
Water from thin air, one more...  - Page 1
Forum section: electronics / general

author: nuclearcat
author_rank: Unknown
timestamp: December 17, 2020, 10:47:23 am
content: (got youtube ad right now)https://moderndiy.convertri.com/endless-water-247lhttps://www.waterfreedomsystem.com/index_tsl_cb_v3.phpSome guy named Chris Burns reinvented one more time water condensing.This time it is a bit boring, very long text and they are selling just books. After scrolling VERY long text, i found this:QuoteI hope this post will be indexed by search engines and people will take a look also at:https://www.eevblog.com/forum/dodgy-technology/yet-another-water-from-air-device/https://www.eevblog.com/forum/chat/couple-wins-$1-5min-xprize-for-invention-to-make-water-out-of-thin-air/https://www.eevblog.com/forum/reviews/water-from-humidity-a-reality-tha-cant-be-debucked/https://www.eevblog.com/forum/dodgy-technology/another-water-from-the-air-technology-but-on-a-grand-scale/etc etcAnd, sure, videos of Dave about Fontus.

author: SiliconWizard
author_rank: Super Contributor
timestamp: December 18, 2020, 06:39:41 pm
content: Nice.Could be great if these devices were powered by solar roads too.

author: nuclearcat
author_rank: Unknown
timestamp: December 18, 2020, 09:47:29 pm
content: Quote from: SiliconWizard on December 18, 2020, 06:39:41 pmAt day they will charge expired batteries by uBeam and at night they can use them with batterizer.

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 19, 2020, 01:31:58 am
content: Quote from: nuclearcat on December 18, 2020, 09:47:29 pmNah, it can only be powered by super nano-diamond nuclear batteries. UNLIMITED...WATER!

author: Refrigerator
author_rank: Super Contributor
timestamp: December 21, 2020, 07:44:19 pm
content: Quote from: Cyberdragon on December 19, 2020, 01:31:58 amYou'll flood the entire Earth.
Another CoolAir, with HydroChill Technology! - Page 1
Forum section: electronics / general

author: StillTrying
author_rank: Super Contributor
timestamp: August 11, 2020, 01:41:55 pm
content: "All you have to do is add water into the tank, then plug it into a standard wall outlet or USB port, and then enjoy the cool air! You can then adjust the air temperature at will using the built-in numerical thermostat. Not only does it cool the air around you, it also completely purifies it."With built in humidifer, - well yeah.https://airfreez.cc/cool/en/

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 12, 2020, 12:35:38 am
content: https://www.eevblog.com/forum/dodgy-technology/evaporative-coolers-hysteria-wave/

author: wraper
author_rank: Unknown
timestamp: August 12, 2020, 12:52:34 am
content: Quote(or other country in the title if you change the link accordingly)The issue is it will not work well in UK. Evaporative coolers work well in places with low air humidity and UK is certainly not one of them.