hybridfree/eevblog-posts huggingface dataset:
[Solved] Being scammed on the bay -- what to do? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: October 09, 2019, 09:01:20 pm
content: So, after 5.5 year and hundreds of happy eBay experience (in US alone), I finally got scammed for the first time.I bought a laptop from the bay, seller promised perfect display and 10/10 condition.When I received it, it indeed has a perfect display, but an inch long linear dent and a chip off on its chassis, plus a bulged hinge, and cracking noise when opening the hinge.Seller claims it's my fault and I damaged the computer, even though his listing photo shows the dent -- I just overlooked it in favor of his 10/10 claim, but it was there.He also listed the wrong part number, the PN he listed comes with Win10 Pro, and the unit he shipped comes with Win10 Home.The seller refuses to refund, and is only willing to send me an upgrade CDKEY, nothing else.What should I do? Should I ask eBay to step in? I can't afford to waste time, since I'm leaving US in 6 weeks.Or should I directly sue him? We are both in the state of NC, and presumably I can drive to his city and sue him locally? Will that save me some time?

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 09, 2019, 09:14:41 pm
content: Quote from: blueskull on October 09, 2019, 09:01:20 pmDefinitely.Quote from: blueskull on October 09, 2019, 09:01:20 pmWell, maybe the US is particularly efficient with that, but directly suing people over here... yeah if you have money and a couple years to waste...

author: ejeffrey
author_rank: Super Contributor
timestamp: October 09, 2019, 09:20:35 pm
content: Small claims court in the US can be fairly efficient and cheap, but I still wouldn't expect to get anything resolved in 6 weeks that way. Best is to contact ebay, although honestly I think you are probably screwed if the dent is in the picture even if it was described in perfect condition. Maybe they will respond to the wrong part number listed, I don't know.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 09, 2019, 09:41:31 pm
content: I personally would have taken action with eBay before returning the item... now you're on your own? (Or does the fact you're returning it automatically opens a claim?)Otherwise the seller could bite back claiming you damaged the item... (probably why you're filming it all, but still...)

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 09, 2019, 09:53:10 pm
content: OK, good luck. I have bought a lot of stuff off eBay, but I still hate sellers like this... they are often a pain to deal with.Thing with professional sellers (I don't know if it was one here) is that they often sell batches of similar items, so you may end up with one from the batch, and not the one that's on the pictures, or that's in the description (with the P/N, S/N, etc.) Happens a lot.
Stromberg Presision - Page 1
Forum section: electronics / general

author: larrybl
author_rank: Regular Contributor
timestamp: October 07, 2019, 02:44:06 pm
content: Anyone know what this would have been used for? Asking for a friend. He opened it to get a pic of the rheostat.

author: ebclr
author_rank: Super Contributor
timestamp: October 07, 2019, 10:35:53 pm
content: This is the analog version of thishttps://www.siglent.eu/sdl1020x-e.html

author: larrybl
author_rank: Regular Contributor
timestamp: October 08, 2019, 12:11:16 am
content: Thanks, I sent this to him.
OP-amp's pin 1 (OPA2365) - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: October 12, 2019, 02:33:49 pm
content: http://www.ti.com/lit/ds/symlink/opa2365.pdfThe actual package's photos are attached.I doesn't have the dot or the round cutout.Am I correct that the vertical line is marking the cutout side and pin 1 is on the bottom left in my top view photo?It is kind of confirmed by the chamfer on the bottom corresponding to the drawing in the datasheet, but I'm not 100% sure.

author: JackJones
author_rank: Regular Contributor
timestamp: October 12, 2019, 02:39:33 pm
content: Is one side of the package cut/chamfered at 45 degrees? It's a bit hard to tell from the pictures, but it looks like from the pictures that the bottom side of the text is chamfered at 45 degrees. It's not very common to see and probabably not general knowledge but the chamfered side marks the pin 1 location.Edit: Duh, you did mention the chamfer. It does indeed mark the pin location.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 12, 2019, 02:41:40 pm
content: Quote from: Axk on October 12, 2019, 02:33:49 pmYes and yes. The bottom side (on your pic) is definitely chamfered.

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: October 12, 2019, 04:01:32 pm
content: Right--its in the datasheet that you were pointing to...see this page:
Anyone work at RMIT in the 80s? - Page 1
Forum section: electronics / general

author: glentek
author_rank: Regular Contributor
timestamp: October 06, 2019, 08:07:10 pm
content: I'm looking for someone who may have worked at the Electronics and Communications Engineering department at RMIT in the 80s.In 1980 to 1982 I worked as a tech in a little workshop with no windows, I think on the 7th floor.When I resigned, I left my home made digital clock (nixie tube and TTL logic) in the workshop. Does anyone remember what became of it, or have any photos that might show it in the background?I found this scan showing some of the circuit:https://archive.org/stream/EA1973/EA%201973-08%20August#page/n43/mode/2up

author: wilfred
author_rank: Super Contributor
timestamp: October 06, 2019, 11:53:09 pm
content: Here is the original article.Did you leave it behind because it was not new enough to be valued and not old enough to be nostalgic over?

author: glentek
author_rank: Regular Contributor
timestamp: October 07, 2019, 12:02:23 am
content: Quote from: wilfred on October 06, 2019, 11:53:09 pmThat's pretty much it. I wish I at least had some photos of it. The parts alone cost me 2 weeks wages in 1973!Thanks for the pdf.
[SOLVED] Is the forum broken or its my browser ?  - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: October 05, 2019, 03:39:49 am
content: While reading TEA thread, I noticed there is a yellow sign on the lock, meaning the page is not secured.I was viewing this post ->TEA thread post #40636But at the forum's main page, its secured.Running at Win7 and latest FF, with No Script and UBlock Origin add-ons, but both disabled specifically for this site.Anyone experiencing this too ?

author: Rerouter
author_rank: Super Contributor
timestamp: October 05, 2019, 03:42:16 am
content: Malwarebytes also flagged that page due to something from "cubeupload"

author: BravoV
author_rank: Super Contributor
timestamp: October 05, 2019, 03:49:07 am
content: Quote from: blueskull on October 05, 2019, 03:41:56 amBut currently the page has two hosts for photos from external, which are secured.Example links of the photos hosted externally.https://i.imgur.com/DEnlwu7.jpghttps://u.cubeupload.com/worsthorse/IMG0792.jpg

author: Monkeh
author_rank: Super Contributor
timestamp: October 05, 2019, 03:51:39 am
content: Quote from: BravoV on October 05, 2019, 03:49:07 amIf you check a little closer, no, the embeds from cubeupload are not HTTPS.

author: BravoV
author_rank: Super Contributor
timestamp: October 05, 2019, 03:54:48 am
content: Quote from: Monkeh on October 05, 2019, 03:51:39 amThis considered not secured ?

author: Monkeh
author_rank: Super Contributor
timestamp: October 05, 2019, 04:01:37 am
content: Quote from: BravoV on October 05, 2019, 03:54:48 amThat's not an embedded image, that's your browser having navigated to it and chosen to use HTTPS.The images as loaded on the page are over HTTP. That is why it is warning you about mixed content.

author: BravoV
author_rank: Super Contributor
timestamp: October 05, 2019, 04:04:13 am
content: Ahh ... got it, thanks guys, silly me.

author: BravoV
author_rank: Super Contributor
timestamp: October 05, 2019, 04:09:17 am
content: Quote from: Monkeh on October 05, 2019, 04:01:37 amWonder why the poster didn't use HTTPS ?Testing below, using forum's IMG bbcode attaching this particular image using HTTPS instead ->https://u.cubeupload.com/worsthorse/IMG0792.jpgYep, this whole page of this thread is still secured.Learn something everyday, thanks.
Is something like this the future of pcb design and production? - Page 1
Forum section: electronics / general

author: scatterandfocus
author_rank: Regular Contributor
timestamp: October 03, 2019, 06:12:47 pm
content: I caught these videos on youtube today. The first is pcb traces being laser printed and then coated with silver ink.The second is pcb's and components being printed directly using an inkjet printer.With graphene coming of age and so much going on today with 3d printing and small cnc's, it seems that in the future it will become the norm to directly print pcb's and even some components integrated into the printed pcb. Thinking about it further, this would open up a world of possibilities, such as realtime online collaboration of circuit design, much more direct sharing of circuits, and really fast circuit revisions.Maybe it will end up being the case that new pcb versions are just inserted into zif like connectors and off you go. And maybe many-layered pcb's will become a thing. And graphene printed semiconductors as part of the pcb. It doesn't take a lot of imagination to see such things as doped inks, sub-circuit localized batteries, flexible pcb sections located in all 3 dimensions to fit around and within mechanical parts and case shapes, and on and on.

author: daqq
author_rank: Super Contributor
timestamp: October 03, 2019, 06:34:20 pm
content: QuoteComponents are already being integrated into PCBs. It's a fairly high priced technology though.IMHO: As to such manufacturing being the future, I don't think so. It's cool I guess, good for rapid prototyping of simple circuitry, but for precision you will need optical methods. In particular the resistance of the traces seems really large in the second video.There are certainly niche areas where that kind of things are useful - direct inkjet PCBs are actually being used for RFID tags, keyboard guts, similar things that do not require extreme precision. This was done using a printer:I can't remember the company thoughQuoteThe question is if anyone would actually want online collaboration on a PCB design outside of your particular team.QuoteYou are mixing technologies - with PCBs you need a fairly low resolution, for useful semiconductor stuff you need um/nm resolutions.

author: daqq
author_rank: Super Contributor
timestamp: October 03, 2019, 06:38:15 pm
content: QuoteThis is also being doneSearch for "molded interconnect device".http://www.harting-mitronics.ch/fileadmin/hartingmitronics/downloads/3D-MID_for_Automotive.pdfhttps://www.molex.com/molex/capabilities/capabilities.jsp?key=mid__lds_technology

author: VK3DRB
author_rank: Super Contributor
timestamp: October 04, 2019, 12:31:15 am
content: Many of us do high density, multilayered PCBs. For prototyping, many people use LTspice, to save time having to lash up small boards. The printing technique for, say, 8 layer boards with blind vias is a long way off. Maybe in 20 years, 3D printing will have evolved to do print such circuits. But by then I'll most likely be dead, so I won't care.
How Transistors Work - The Learning Circuit - Page 1
Forum section: electronics / general

author: vlad777
author_rank: Frequent Contributor
timestamp: October 03, 2019, 11:00:19 am
content: 4:20 to 5:26Is this thing totally bogus or do I have to go back to school?At 4:20 she says that Vce is equal to Vbe , and in the rest of it I think they messed up the schematic.

author: keithu
author_rank: Contributor
timestamp: October 03, 2019, 11:27:48 am
content: Bogus.I remember watching this video a few months ago and spotting a number of serious mistakes. I'm surprised a decent company like Farnell haven't taken it down, but the comments seem to be mostly positive

author: vlad777
author_rank: Frequent Contributor
timestamp: October 03, 2019, 11:31:32 am
content: It makes you think what have her and the viewers agreed upon?If they both don't know what they are saying but still agree?

author: taydin
author_rank: Frequent Contributor
timestamp: October 03, 2019, 11:48:06 am
content: I found it to be rather weak, too.I think the most fundamental concept about the transistor is that you can cause large current changes on the collector through very small current changes in the base. The switch is just a special application of this concept.
Aust 1194 talking clock finishing tomorrow night - Page 1
Forum section: electronics / general

author: vk3yedotcom
author_rank: Frequent Contributor
timestamp: September 29, 2019, 10:46:09 am
content: I wonder how many people will be dialling 1194 just before midnight tomorrow to hear the last throes of the talking clock (in Australia)?Article about it here:http://www.orarc.org/wp-content/uploads/2019/05/oxtales1905.pdf

author: Muttley Snickers
author_rank: Unknown
timestamp: September 29, 2019, 11:34:45 am
content: I don't mean to be a pain but could somebody please post the linked article in a text or image format as I cannot open certain document types nor web pages from this silly devices browser. Thanks in advance.

author: wilfred
author_rank: Super Contributor
timestamp: September 29, 2019, 11:57:09 am
content: Just go herehttp://www.orarc.org/?page_id=28and right click download May 2019

author: VK3DRB
author_rank: Super Contributor
timestamp: October 02, 2019, 09:06:17 am
content: Thanks Peter,One day, when the Internet stops, we will wish for the good ol' days for the talking clock.One reason why I am getting back into HF ham radio. Hackers cannot hack ham radio, except for the Russians with their woodpecker. When the Internet stops, I could charge $1000 per hour to step on my property, except money won't be of any use when you cannot buy anything. Oh, and I'll need solar and batteries as a back-up. All in good fun.Could the Internet stop? Look up the Carrington Event of 1859.

author: austfox
author_rank: Regular Contributor
timestamp: October 02, 2019, 09:55:40 am
content: Quote from: VK3DRB on October 02, 2019, 09:06:17 amYes, you’ll be dialing 1194 on your old bakelite with rotary dial.

author: GlennSprigg
author_rank: Super Contributor
timestamp: October 02, 2019, 10:29:32 am
content: I forgot, and missed hearing it for the last time !!I reckon it would be a great "talking-piece" (excuse the pun!)to have the device on a shelf in one's collection !....

author: Someone
author_rank: Super Contributor
timestamp: October 02, 2019, 10:28:59 pm
content: Apparently there were 4 of them:https://en.wikipedia.org/wiki/Victorian_Telecommunications_Museumanother here:https://pbase.com/lambsfeathers/image/35269344So that leaves one more? Its a little less convenient to hear them now but they aren't gone.
eBay parts/not working search condition removed? - Page 1
Forum section: electronics / general

author: JonHendry
author_rank: Contributor
timestamp: October 02, 2019, 12:35:49 am
content: Was just looking at scopes and noticed that the condition option "Parts/Not Working" isn't available for searches, even though there are parts/not working items listed. Instead they're just thrown in with the "used" items.eBay bug or bad eBay policy change?

author: xrunner
author_rank: Super Contributor
timestamp: October 02, 2019, 12:41:17 am
content: It's still described in the help area here (Business & Industrial) -https://www.ebay.com/help/selling/listings/creating-managing-listings/item-conditions-category?id=4765&st=12&pos=2&query=Item%20condition%20by%20category&intent=condition&context=9014_BUYERMight be a problem with the site at this time.

author: windsmurf
author_rank: Frequent Contributor
timestamp: October 02, 2019, 12:59:48 am
content: Quote from: JonHendry on October 02, 2019, 12:35:49 amSome kind of policy change... "Parts/Not Working" filter is still available for some searches you do... for others, no.Do a search for "canon digital camera" and you get a filter to show just "For parts of not working" condition items.Do a search for "tektronix" and you don't get that selection, even though "parts only" listings exist.

author: edpalmer42
author_rank: Super Contributor
timestamp: October 02, 2019, 04:21:20 am
content: I won't be surprised to see this trend continue.It started some years back when they:- Ended wildcard searches.- Stopped showing auctions where the seller doesn't say he'll ship to your country. This one doesn't seem to be consistent.Lately I've noticed:- If you turn off their suggestions, it turns back on when you do a new search- They've started removing some listings from the search results. You have to click on a link to get them all.- If you change the number of listings per page, that also reverts to default with new searches.- Occasionally, a search just fails. Refresh the page and it suddenly works.This all feels to me like they're desperately trying to reduce the load on their search system. I can't imagine how horrendous a job it is to search a system the size of ebay and respond as quickly as they do. But either they're not willing to pay for the necessary resources or they're reaching the limits of search technology. I have no idea if that even makes sense.Ed

author: SilverSolder
author_rank: Super Contributor
timestamp: October 02, 2019, 11:17:31 am
content: Ebay is trying to maximize sales of "easy sell" products for mobile phone users... more than half of eBay sales are made via mobile phones these days, apparently. People don't even read the listings, they look at the picture and buy.This is of course anathema to carefully looking for specific products, models, etc. on a PC with a large monitor. If you do, you will still only see three listings per page, LOL.Basically, eBay seems to be doing a "Windows 8" by dumbing down their user interface in order to cater to what they see as the biggest growth markets...
Whats a good place (US mail order) to buy rg6/cable/connectors 50 ohm RF stuff - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: October 01, 2019, 03:59:27 pm
content: I used to know a company that sold cables, connectors, adapters, etc, that shipped from the US had decent prices and wasn't chinesium counterfeit stuff. No waiting a month buying off Alibaba or ebay that's just flooded with BS stuff where after a month of waiting you find it doesn't work or is used. For the life of me I can't find it(sorry my eye sight sucks and using google isn't as easy for some of us). I probably clicked on it but didn't realize it. Sick of getting junk online from amazon and having to return it.So I have a new place with access to a fourth story roof and want to turn it into an antenna farm. I just need a roll of cable and lots of adapters.

author: tooki
author_rank: Super Contributor
timestamp: October 01, 2019, 04:13:13 pm
content: Antenna farm for what? (Just asking cuz video usually uses 75Ω, not 50.)Anyhow, Digikey, Mouser, Parts Express, Radio Shack even...I've never used it, buthttps://www.americanradiosupply.com/seems promising.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: October 01, 2019, 04:16:28 pm
content: You know that RG-6 is 75 ohm, not 50 ohm, right?If you actually want 50 ohm stuff, try DX Engineering:https://www.dxengineering.com
iPhone 11 PCB  - Page 1
Forum section: electronics / general

author: mrburnzie
author_rank: Regular Contributor
timestamp: September 28, 2019, 07:43:18 pm
content: Am I the only one that is fascinated by the new iPhone 11 motherboard?Are components stacked between layers or are there 8+ layers and components placed right by each other?Anybody here with experience regarding that kind of stacked PCB? What is the process of engineering something like that?

author: ebclr
author_rank: Super Contributor
timestamp: September 28, 2019, 10:10:55 pm
content: I don't know how they are made, instead, I know that Apple will refuse to fix any problem, and will point you as make something wrong, even if you did nothing, and ask you to buy a new phone, that is the only thing that is for sure.

author: james_s
author_rank: Super Contributor
timestamp: September 29, 2019, 12:20:50 am
content: In my experience the phones are very reliable, well constructed and work as advertised.I refuse to even consider any phone that has that stupid notch in the screen though. That is just bad design, a complete joke for something that is supposed to be high end however I see them everywhere so obviously a lot of people have money and don't care.

author: 0culus
author_rank: Super Contributor
timestamp: September 29, 2019, 12:38:35 am
content: Eh, I've had an iPhone X for just almost two years now. It doesn't bother me one bit. YMMV.

author: james_s
author_rank: Super Contributor
timestamp: September 29, 2019, 02:54:43 am
content: Obviously a lot of people are not bothered judging by the number of them I see. A lot of people don't seem to mind the stupid logos that every TV channel has floating in the corner either, but both bother me a lot. So much that I completely stopped watching broadcast TV and any content with logos/watermarks obstructing it years ago. It makes the product/content unusable to me.

author: 0culus
author_rank: Super Contributor
timestamp: September 29, 2019, 03:11:42 am
content: Now I agree with you on that. I haven’t watched broadcast (or cable, or satellite even) in years. Not worth my time for a variety of reasons.

author: ebclr
author_rank: Super Contributor
timestamp: September 29, 2019, 03:26:18 am
content: I refuse to buy anything from apple, they are a totally unfair company, I have a very expensive Ipad pro, who the screen is damaged, but still works it's a crack basically, they 1st deleted all my data, then they told-me to replace with a refurbished unity paying 80% of the price of a new Ipad, since on the " genius bar "view" is impossible to fix my unit .Of course, I'm no fool, and just replace the screen myself, But the way that they handle any kind of service is ridiculous and unfair. I'm not alone on this bandwagon
Unexpected 'cracking' found on critical Boeing 737NG equipment - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 28, 2019, 12:10:18 am
content: Even more bad news for Boeing.https://komonews.com/news/local/exclusive-unexpected-cracking-found-on-critical-boeing-737ng-equipment

author: windsmurf
author_rank: Frequent Contributor
timestamp: September 28, 2019, 02:48:06 am
content: It wasn't too long ago that the FAA issued an Airworthiness Directive that mandated 737NG and MAX wing parts inspection and replacements for cracking discovered on wing slat assemblies...https://www.seattletimes.com/business/boeing-aerospace/more-than-300-boeing-737s-to-be-inspected-for-faulty-parts/Now the wings might fall off?

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: September 28, 2019, 06:43:24 pm
content: I was chatting with an FAA employee recently, we were talking about booking airline flights. He actually said "I make sure to never fly on Airbus", and then repeated the saying "If it ain't Boeing, then I ain't going". I didn't pursue the topic...I doubt he has anything to to do with Boeing or aircraft safety, and could be a complete outlier. Obviously he wasn't talking in an official capacity. But many people suspect FAA is biased towards treating Boeing very leniently, especially viewed as "protecting national interests". I really wonder how many at FAA also want to help Boeing beat Airbus, and are willing to relax oversight.
Did you have sex today? - Page 1
Forum section: electronics / general

author: 001
author_rank: Super Contributor
timestamp: September 28, 2019, 02:35:44 pm
content: Sorry for clickbateBut I need to know when electric tools (drills etc) became common in Your countries

author: Simon
author_rank: Unknown
timestamp: September 28, 2019, 02:41:19 pm
content: what the hell are you on? You are usually a bit out there but really? What the?

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 28, 2019, 02:42:38 pm
content: Who are you, AvE? Don't do such things with drills, that's dangerous!

author: tggzzz
author_rank: Super Contributor
timestamp: September 28, 2019, 02:43:15 pm
content: Please don't answer clickbate; if you do the perp will try it again.

author: 001
author_rank: Super Contributor
timestamp: September 28, 2019, 03:16:40 pm
content: WowNow I know who didn`tThe question is about date of relise powered tools in Your country: drills, saws, angle grinders etcI cant find any grinder before 1986 here

author: Simon
author_rank: Unknown
timestamp: September 28, 2019, 03:19:15 pm
content: So what is the question?

author: 001
author_rank: Super Contributor
timestamp: September 28, 2019, 03:20:35 pm
content: We can see vintage electronics hereBut no power tools GAS yet
rohde & schwarz urv5 about help  - Page 1
Forum section: electronics / general

author: mrserbest
author_rank: Newbie
timestamp: September 26, 2019, 03:54:30 pm
content: gifted by a friend rohde schwarz urv5 available and urf5 z7 probe1. which measurements can I do2. where can i usethanks in advance for your help

author: German_EE
author_rank: Super Contributor
timestamp: September 28, 2019, 10:07:28 am
content: OK, I'll bite.On the Internet there is this thing called 'Google' where you key in the name of something and up comes all sorts of information from data sheets to the current price. I just tried this and found the following on the manufacturer's website:The voltage sensors of the ̧URV5-Zseries are indispensable tools in RF andmicrowave laboratories, test departmentsand service. They cover a frequencyrange from 9 kHz to 3 GHz and thus closethe gap between low-frequency voltagemeasurements and microwave powermeasurements.Consequently they may be used for thefollowing measurements:◆ High-impedance DC and AC voltagemeasurements in non-coaxial circuits◆ Level measurements in 50 Ω lines◆ Terminated power measurementsVoltage sensors are the right tools foreveryday use. They permit the measure-ment of voltages from 200 μV to 1000 Vand of powers from 1 nW (−60 dBm) up to200 W (+53 dBm).So, there yah go. If you're too lazy to use Google I'm sure that you will find some helpful soul to do the work for you.Pause for applause

author: mrserbest
author_rank: Newbie
timestamp: September 28, 2019, 11:32:47 am
content: I found a lot of documents but with urv5-z7 rf probe which measurements can be madehttps://dosya.co/19463vowl8hk/URV5-Z1_Z7_Z2_Z4.pdf.htmlall probe ducument
Why this video is not marked as watched? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: October 02, 2019, 10:18:21 am
content: The video appears in the subscription list as expected, yet it's not watermarked with the "WATCHED" word, and the yellow bar of watching completion is not shown.At first, I thought maybe it was reaploaded, but I just let it run again, out of curiosity, and it still appears as not watched in my YouTube subscriptions page.Is this a bug?The video is from the SmarterEveryDay channel"The Gun Detector - Smarter Every Day 225"
Is RS having a laugh with these prices??? - Page 1
Forum section: electronics / general

author: Illusionist
author_rank: Regular Contributor
timestamp: September 25, 2019, 12:06:40 pm
content: I need a few ESD-safe cleaning brushes. While I usually try to order from RS rather than Farnell (who keep messing me around), I can't stomach the price difference for this:Farnell's price... £4.56RS's price... £32.55As far as I can see they are probably identical. Their other brushes seem a bit over priced too. Come on RS, get real!

author: Zero999
author_rank: Super Contributor
timestamp: September 25, 2019, 12:19:04 pm
content: Perhaps you should drop RS an email, asking them why they sell those ESD brushes for so much more than Farnell?

author: coppice
author_rank: Super Contributor
timestamp: September 25, 2019, 12:24:28 pm
content: Maybe RS are selling the wireless version.

author: johnkenyon
author_rank: Regular Contributor
timestamp: September 28, 2019, 02:15:59 pm
content: I get the impression that RS have reverted to wanting to cater for companies ordering in bulk, and companies run by idiot beancounters who think they can save money by forcing their engineers/staff to order from a list of "approved vendors" who charge N times the going rate.Luckily I have a RS trade counter 20 minutes down the road for the rare beast that is something that somebody else doesn't do, and doesn't cost an arm and a leg.Yesterday this was an filtered IEC mains inlet. I also scanned through some outstanding items on the "to go on the next CPC/Farnell order" list - not one single item was cheaper, and some of the prices had me laughing in stitches.

author: Gyro
author_rank: Super Contributor
timestamp: September 28, 2019, 02:34:42 pm
content: I find that I have to shop around if I want the best price. Certainly on semiconductors and passives, RS are often cheaper than Farnell, but sometimes the other way round. If CPC actually stocks an item then it will likely be cheaper than both (delivery time permitting). Price breaks vary too.I don't think you can draw a hard and fast rule that X is always cheaper than Y. [EDIT: Apart from ESD brushes that is]
YouTuber charged loads of fans $199 for shoddy machine-learning course... - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: September 27, 2019, 11:25:47 pm
content: YouTuber charged loads of fans $199 for shoddy machine-learning course that copy-pasted other people's GitHub codehttps://www.theregister.co.uk/2019/09/27/youtube_ai_star/
HUMAN BODY VIBRATION EXPOSURE AND ITS MEASUREMENT By G.Rasmussen  - Page 1
Forum section: electronics / general

author: Free_WiFi
author_rank: Regular Contributor
timestamp: September 25, 2019, 11:44:23 pm
content: http://www.windturbinesyndrome.com/wp-content/uploads/2009/08/frey-rasmussen-mechanical-man-6-08.pdf

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 26, 2019, 03:01:54 am
content: Makes sense. Humming, I can definitely see the ~85Hz eyeball cutoff against my CRT monit-- oh, I guess I can't anymore because it's passed away.Heh, but more to the point -- persistence of vision only works on what's in the visual field, and if the field itself is moving (because your head is vibrating at some vocal frequency say), then it's not going to adjust, and any shudder in the image itself (scan rate) will visually interfere with the vibration.It's also hard to get much vibrational amplitude, if any at all, at higher frequencies; this is easily verified [on a CRT monitor] by using a smaller resolution at a much higher refresh rate, and seeing that a visual beat frequency does not appear.Tim

author: Zero999
author_rank: Super Contributor
timestamp: September 26, 2019, 08:25:07 pm
content: It can be a problem for people using heavy machinery.Much higher frequencies, in the ultrasonic range can also be a problem for divers working near high powered sonar, as it can cause cavitation in the blood.
no joke, my Apple iPod has survived the washing machine - Page 1
Forum section: electronics / general

author: legacy
author_rank: Super Contributor
timestamp: September 27, 2019, 02:39:21 pm
content: oh well, more or less, it has survived.It was a Shuffle 3G, made in 2007, loaded with 2Gbyte of flash. Heating at 60 C during the centrifuge step had made the battery to inflate so much that it bent the aluminum case, which literally bent over like the top of the box of anchovies, hence the case got rebuilt in plexiglass and polycarbonate.Anyway, it still works

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: September 27, 2019, 03:06:40 pm
content: An iPhone survived 15 months at the bottom of a river:https://time.com/5687215/iphone-water/

author: Zero999
author_rank: Super Contributor
timestamp: September 27, 2019, 07:33:15 pm
content: My old iphone 4 recently broke after falling from a height of 1.4m. Other phones I've had have survived such abuse,

author: Ampera
author_rank: Super Contributor
timestamp: September 28, 2019, 07:00:52 am
content: I've survived being put into a washing machine and being dropped on my head as a child too. It's nothing to brag about, it happens all the time.lol I like applesauce

author: Halcyon
author_rank: Unknown
timestamp: September 28, 2019, 09:54:17 am
content: Most brand name phones/smart devices these days have conformal coatings to protect against water ingress. Even iPhones have relatively robust bodies and mainboards. I've successfully recovered data from phones which have been immersed in salt water and have suffered significant corrosion and those that have been deliberately struck with hammers or axes.
EMF EMI RF RFID Protection Fabric for bed canopy / mosquito net - Page 1
Forum section: electronics / general

author: xrunner
author_rank: Super Contributor
timestamp: September 25, 2019, 06:15:10 pm
content: eBay auction: #372712735849

author: Gyro
author_rank: Super Contributor
timestamp: September 25, 2019, 06:31:09 pm
content: It appears to be lacking RF bonding between the elements and with a ground-plane / conductive floor.

author: floobydust
author_rank: Super Contributor
timestamp: September 25, 2019, 07:20:19 pm
content: Apparently it's silver fiber fabric, and they sell a sheet for the underside of the mattress."Passed by SGS test to verify 99.9% shielding effectiveness across the range of everyday radiation (<10MHz to 8GHz with ~50db attenuation). Put your cell phone inside,after 30 seconds your signal will go down or disappear."It might have use shielding a workspace on the bench? Most labs are pretty noisy from lighting sources.

author: borjam
author_rank: Unknown
timestamp: September 25, 2019, 07:45:30 pm
content: Paraphrasing a friend, such a contraption indeed shields a fool from his own money.

author: jmelson
author_rank: Super Contributor
timestamp: September 25, 2019, 07:58:39 pm
content: I'm astonished by the price! They could be asking a LOT more for this kind of thing!Jon

author: Gyro
author_rank: Super Contributor
timestamp: September 25, 2019, 08:09:14 pm
content: Quote from: floobydust on September 25, 2019, 07:20:19 pmGiven the difficulties in preventing radiated EMC via unintentional slot antennas introduced in metal cased products, it's difficult to see how simply drawing the curtains would assure reliable continuity of bonding along the length of the join.EDIT: I know that items like microwave ovens achieve decent attenuation through a non-conductive door seal, but they achieve that by specifically tuned quarter wave traps and microwave absorptive materials. It's difficult to see how a loose non-bonded curtain overlap would achieve the same effect.

author: Pinkus
author_rank: Frequent Contributor
timestamp: September 25, 2019, 09:17:25 pm
content: Quote from: jmelson on September 25, 2019, 07:58:39 pmTheir showed price is the price per square meter, not for the whole 'tent'. Herehttps://www.aliexpress.com/item/32979925276.htmlyou can get the fabric even cheaper.

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 26, 2019, 04:33:18 am
content: Shouldn't this be in dodgy tech?Also, they could have used magnets like the "magic mesh" with the magnets embeded inside to ensure contact across the material. But of course it's just a quack medical scam so not much thought was used anyway.

author: vk6zgo
author_rank: Super Contributor
timestamp: September 26, 2019, 04:51:09 am
content: Quote from: floobydust on September 25, 2019, 07:20:19 pmWhat's this 30 seconds stuff?OK, there might be a tiny delay while the thing realises there is no signal---- but thirty seconds?Quote
Is not using a GND pour on purpose a bad habbit? - Page 1
Forum section: electronics / general

author: bjdhjy888
author_rank: Regular Contributor
timestamp: September 24, 2019, 01:08:05 am
content: I know it's good to use a ground pour, but I found a PCB with no GND pour would have a clearer view of the wires on the board, thus, it would be easier for me to debug it, cutting wires or soldering flying wires.It would be more difficult for me to do so if there were a GND pour.Is this a good thing to do?

author: tautech
author_rank: Super Contributor
timestamp: September 24, 2019, 01:16:36 am
content: The type of circuit and its particular sensitivitiesmattershowever for debugging place some copper text next to the important nets and/or some SMD test points to hook probes directly to.These fit nicely onto a 0805 footprint and you can recycle them after your prototype work is done.https://www.digikey.co.nz/product-detail/en/keystone-electronics/5015/36-5015CT-ND/278886Buy them in bulk and sell some to friends to keep the costs down.

author: Neilm
author_rank: Super Contributor
timestamp: September 24, 2019, 06:54:50 pm
content: Depending on the application I have found a ground pour can cause more issues than it solves.

author: daqq
author_rank: Super Contributor
timestamp: September 24, 2019, 08:26:48 pm
content: QuoteDepends. At the end of the day it has to do with signal integrity and current return paths.A copper pour in an internal layer is an invaluable tool for high speed design - and high speed design these days includes basic MCUs, where a rising edge can be in the few ns order.Per rule of thumb it helps, or at least does not do harm... but.Depending on the application, a poorly though through copper pour can even create unwanted current paths that will affect your application in a negative way.It's simply a tool, neither good, nor bad.Relevant reading:https://www.analog.com/en/analog-dialogue/articles/staying-well-grounded.html(there are many other good texts)
My shitty week of repairs!!!! - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: September 24, 2019, 08:50:39 am
content: Well we all have that weeks.I will start.I had some things around here that I've been waiting too much time to repair, and decided to start. Let's say that the success rate is low, well none basically until now.First lets start with the Philips HD2079 Soy Milk Maker. My wife tried to use the machine last week and as normal, the machine should start, heat up the liquid and then the motor starts. Although when the motor was supposed to start the machine turns off and restart after 30 sec.I opened and I was met with this carnage:Even if I wanted to change the motor for another one or the brushes, the apparatus itself its made if I try to rip the motor out, I break the supports of the same, so the only way is changing the entire bottom part, that conveniently I tried seached online and none are available to sale (at least I didn't found any). The motor is inside of a metal cylinder that goes from top to bottom, that is part of the outside of the bottom assembly. Tried to hit it to see if it moved, not even a inch. The control board is isolated and it is in perfect condition, no burning marks or black spots, the ones that were there were cleaned with a tissue and were from the motor itself (the case was full of small bits of the brushes from the motor).So a new one it have to be.Ok, then lets go to the next one: MI TV 40 Inch L40M2-AA no start up, no lights, nothing.I was expecting that the Fuse was the cause. In the Input of the cable in the PSU, 230V AC. Fuse OK, secondary part of the PSU had a plug that connects to the left board were is the processor part of the TV, with a plug of 18 pins, where 4 were 12V and 4 5V. tested all with the right voltages, so PSU is not.Unfortunately I don't have a scope to test the logic part of the TV, but I suspect it was a corrupted software update because my wife told me that the TV stopped working after it said in the screen that it was going to restart.I don't have a USB TTL available so this one will have to be when I received.Ok last one, Phicomm PSG1218 router, that one was one that I wanted to put the OpenWRT on it, since the official software is very basic compared with what the router is capable of with custom software.All the search I've done online shows that all the firmwares support downgrade to a earlier version, exempt the one I have, the last firmware available on the website, were they simply plug the vulnerability in the Telnet connection that allowed that. Other vulnerabilities like changing the headers of the page via inspect in Firefox, or accessing to a terminal prop in the webpage of the router itself or even loading a custom backup settings file to activate the SSH needed to flash the firmware were plugged. The only way is the same as the TV, USB TTL to write the eeprom with the custom firmware.So 0 success out of 3... What a shitty way to start a week.
More dodgy work from a contractor.... - Page 1
Forum section: electronics / general

author: Lee697
author_rank: Regular Contributor
timestamp: September 24, 2019, 08:58:41 am
content: This one gave me a shock.I was replacing a 4' fluoro fitting the other week, turned it off, checked wiring with a non-contact tester, and was rewiring the new fitting in when I got a nice solid AC shock off the earth wire. Yep - the earth was sounding off to my tester now..... I flipped the main switch and finished it off, everything seemed fine.....My sparky dropped over yesterday and did some testing - 100V AC or so between that earth and neutral, earth to active was reading 130V AC. In the fuse panel traced the earth wire back, and yep, it was open circuit. He noted the guy who had wired the fuse box had bonded the earths together by bundling them up (at least 25mm thick), wrapping some copper around the outside with a few spits of solder. When he gave the earth in question a tug it pulled straight out of the bundle..... When properly bonded down everything was in spec, on that circuit anyway.....This was from a (seemingly) pretty reputable mob too.....

author: GlennSprigg
author_rank: Super Contributor
timestamp: September 24, 2019, 11:08:10 am
content: Yep. I've never trusted 'Bundled' Earths or Neutrals, for that reason. Not only can you not guaranteewhat some shoddy person has done, before, but wiring can not be easily separated during rewiring.Always use separate Earth & Neutral bars, with the Earth bars having 2 screws per tunnel. They haveseparate larger tunnels for the Main-Earth to Ground, and an easily identified M.E.N. (main earth neutral)link cable to the Neutral bar. If there is no room for them? then the pseudo Switchboard box is not anapproved one, or home made. Treat Earths, with more importance than everything else!!I had a confusing scenario many years ago, where 2 Neutrals were twisted together, but not connectedproperly to the other Neutrals. (3 phase switchboard in a factory). They were for 2 different lightingcircuits, on 2 different phases. They would only come on, if 'both' lighting systems were turned on !!With 415v across 2 circuits in series, instead of 240v across each circuit !! Was hard to find!!

author: Lee697
author_rank: Regular Contributor
timestamp: September 24, 2019, 11:20:12 am
content: Cheers.... He's coming back to unbundle them and properly bond them all separately, and then check all the home outlets...
What makes a good electronics engineer? - Page 1
Forum section: electronics / general

author: bjdhjy888
author_rank: Regular Contributor
timestamp: September 24, 2019, 12:21:41 am
content: My two cents:He can code a Windows 10 OS or Ubuntu from scratch using C.He fullly understands CPU, MCU and parts at nano level and uses them like a walk in the park.He outguns Leonhard Euler for his math talents and achievements.He sells more products than Coke is consumed.Amiright?

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 24, 2019, 04:47:06 am
content: Pretty narrow guy if all he knows are OS and computer chips. How about antennas? Mixers. Higher order control systems. Low noise analog. High efficiency switching power. High voltage power transmission and control. Automotive and industrial operating environments. Radiation hard circuit design.Actually I would define a good electronics engineer as one proficient in his area which is broad enough to deliver complete solutions to real problems. One who can communicate his results to others, understands the financial requirements on his products and has the patience and persistence to support his designs through a significant part of their life cycle. Double bonus points for ability to lead teams bringing out the best in members and developing those who will eventually replace him.

author: Berni
author_rank: Super Contributor
timestamp: September 24, 2019, 05:39:49 am
content: Some of the best engineers can't write a hello world program in C, and part of the reason why they belong to said group has to do with why they can't write a hello world program because they ware too busy working on Analog or RF electronics.There is no such thing as a "jack of all trades". The reason they are really good at something is because they focused a lot of there effort and experience into that subject. A lot of engineers wont give a fuck about C or Linux or any open source software. They don't need to see the source code of there SPICE simulator or EM field solver. It runs just fine under Windows cause they have no time to muck about recompiling things from source to run on Linux, they got some analog cirucitry to design not waste time solving compile time dependency errors.And this goes the other way too. There are lots of people who can write drivers and recompile a linux kernel as easily as they tie there shoes. They are programing wizzards that can make Linux do pretty much anything given enough time. Yet you might have a hard time even explaining what a pullup resistor is to them.A good engineer is simply good at the field they work in. Its impossible to be the best in every field simultaneously because electronics today are way too complicated.

author: spudboy488
author_rank: Regular Contributor
timestamp: September 24, 2019, 11:29:29 am
content: A good engineer may not know all the answers but is good at finding them.
Oscilloscope Music - Page 1
Forum section: electronics / general

author: raptor1956
author_rank: Frequent Contributor
timestamp: September 21, 2019, 09:15:14 pm
content: I remember some videos from a few years ago that featured music generated that when the output was connected to an oscilloscope it would create some interesting geometric patterns but I can't see to find those videos anymore -- anyone know what I'm talking about? The music was kind of a EDM like thing that was not terrible from a purely musical standpoint but it produced some interesting patterns as well. I think this was either 2015 or, more likely, 2016. I wish I could be more descriptive but it's been a few years.Brian

author: Andy Watson
author_rank: Super Contributor
timestamp: September 21, 2019, 09:51:40 pm
content: This sort of thing ?There's a whole thread about it somewhere on the forum. Try searching "oscilloscope fun", also as mentioned in that video description "Jerobeam Fenderson" is another good search term.

author: BrianHG
author_rank: Super Contributor
timestamp: September 21, 2019, 10:09:25 pm
content: The magic of forum search: 'oscilloscope-music'https://www.eevblog.com/forum/chat/oscilloscope-music-77865/msg1077411/#msg1077411

author: raptor1956
author_rank: Frequent Contributor
timestamp: September 24, 2019, 06:20:25 am
content: Well there are a lot of videos on the topic but it was the one called "oscillofun" that I was trying to remember -- found it.Brian