hybridfree/eevblog-posts huggingface dataset:
Best Website on Maxwell's Equations I've ever seen - Page 1
Forum section: electronics / general

author: DANNYSEBAHAR
author_rank: Newbie
timestamp: September 26, 2018, 11:35:24 pm
content: http://www.maxwells-equations.com/By far the best explanation of Maxwell's equation on the web. I've been dumbfounded for years about them but I guess this has been sitting on the web gathering dust this whole time. After just two hours of reading the website entirely (it doesn't take long at all) and doing the transformations of the equations presented I can final say I got it:The guy goes and simply shows you how everything is derived and he try to do it as intuitively as possible.I've spent days trying to learn this stuff. I used this website and in two hours I got it down.The best part's were step by step derivations of Gauss's, Ampere's, Len's, and Faraday's Laws.Another neat thing was an example of how Maxwell envisioned how current flows through a capacitor to figure out displacement current and adding that to Ampere's Law made the four equations "Maxwell's" equations.I didn't put this in the Beginner's thread because this isn't helpful in any way. I mean, know it is cool. But it's unnecessary for EE at the DIY or non-professional level.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 27, 2018, 09:17:57 pm
content: One of the best tests to see if you have "got it" is to think about one of the staples of science fiction in the 1980s - magnetic monopoles - and see how that concept relates to Maxwell's. What would you have to modify if such were found?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 27, 2018, 11:24:14 pm
content: At a glance, looks reasonable. Cheers!Tim

author: srce
author_rank: Regular Contributor
timestamp: September 28, 2018, 07:06:29 pm
content: Good site, thanks.Quote from: CatalinaWOW on September 27, 2018, 09:17:57 pmWell, it does actually mention that a bit.I guess Gauss' Law for Magnetism would need to change so that divergence of the magnetic field (Del dot B) would be equal to the magnetic charge, rather than zero.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 28, 2018, 08:44:06 pm
content: Quote from: srce on September 28, 2018, 07:06:29 pmSpoilersTim

author: CatalinaWOW
author_rank: Super Contributor
timestamp: September 28, 2018, 09:18:01 pm
content: That is half the answer. Two equations need to change.

author: srce
author_rank: Regular Contributor
timestamp: September 28, 2018, 10:49:25 pm
content: I guess a term equivalent to the displacement current density should also be added to Faraday's Law doesn't seem to work
ESP32 on commercial products - Page 1
Forum section: electronics / general

author: metRo_
author_rank: Regular Contributor
timestamp: September 29, 2018, 12:48:18 am
content: Hello,Espressif said that they shipped 100M esp32 but I can't find commercial products using ESP32 and it doesn't look the hobby market is that big. Do you know any mass production commercial product using ESP32?thanks

author: TK
author_rank: Super Contributor
timestamp: September 29, 2018, 12:53:39 am
content: The newly announced Arduino MKR WiFi 1010 uses the ESP32 module made by U-Blox.https://store.arduino.cc/usa/arduino-mkr-wifi-1010

author: Rerouter
author_rank: Super Contributor
timestamp: September 29, 2018, 01:00:53 am
content: Its likely baked into cheap wifi connected devices, Its got fairly well vetted software libraries and can act as both a microprocessor and communication transceiver,
Trolled by utube search results - Page 1
Forum section: electronics / general

author: lordvader88
author_rank: Frequent Contributor
timestamp: September 28, 2018, 01:00:24 am
content: Sometimes I search for stuff, and they show stuff in the 1st few dozen results that has none of the words in the title, or even highlighted in the description. And I'm not talking about technical stuff, I'm talking about pretty common stuff to search for too.And some of it has NOTHING to do with what searched, they just start adding all the stupid trending video's I never watch anyways

author: Red Squirrel
author_rank: Super Contributor
timestamp: September 28, 2018, 12:25:44 pm
content: Wonder if these are somehow "sponsored" videos or something, not sure if it's something they do.Youtube has been trolling me too, I'm growing my hair out and I keep getting balding related videos in my recommended list.
World Maker Faire 2018 - Page 1
Forum section: electronics / general

author: innkeeper
author_rank: Unknown
timestamp: September 27, 2018, 07:27:54 pm
content: I've been attending maker faire's for at least 9 years.I was highly disappointed at this year's world makier fair.has maker faire jumped the shark?It used to be that you could go and see a lot of new innovative things.This year seemed stale, not much new content, lots of seminars, but not many that would blow you away. and getting ever more mainstream commercial. Yea the coke and mento's guys were there again, 3d printers, now are ho hum. adam savage was there pitching a new tv series, power wheels racing.. again and seemed to gather little interest from non-participants though. hey added dance battles... dance battles? really.. so makeresque. overall lot less tent space for actual tech content.it seems now its more about separating you from your money, Heck even the company wallabot had someone giving a seminar on an introduction to the wallabot ..for 15 bucks?!?!?!1 day parking 40 bucksa lemonade 10 buckswater 5 bucks.cost for a single adult day of the Faire 50 bucks (40 online) 80 for 2 days (70 online).so yea to hang out saturday, on a whim, is gonna run you 100 bucks and that's if you only drink a lemonade and don't eat. I'm surprised they didn't charge you for the portopotty usewhat did you see, pretty much what you saw last year, but less of it.. yea lot less real content this year.a lot fewer hands-on stuff, a lot less hakereque things like .. i didn't lockpick this year, though i could have just missed it... thought he 2600 folks were there... but seemed to also have jumped the shark too, not many paying them any notice these days.remember when you could participate in things, sign up for one of those arm bands that says you signed a waver in case you get hurt so you could participate in some fun stuff.. lol.. well those days are gone..saving grace was the few hackerspaces that came. and they added a blacksmithing area and cosplay area, which, considering there are dedicated cons for that in new york made me think it was more a filler to make of up for otherwise empty spaces left by those that didn't return this year.was anyone's experience better than mine, were there any real redeeming qualities...The only thing I saw that was kinda new and interesting was 2 desktop waterjet machines. one of which was shown as a prototype last year. please post what you saw new and interesting, and they did get rid of the human-sized mousetrap and added 'the hand of man'anyone find anything really interesting or learn anything interesting at maker faire this year?
Gould's Book Arcade closing.  - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: September 27, 2018, 11:32:02 am
content: This is for Sydney residents, and probably mostly for the older ones.Gould's Book Arcade on King St Newtown has been a 2nd-hand book-lover's landmark for a very long time. All my life...It's closing. This weekend will apparently be the last days open. Hours 11am to 7pm.I find this very sad. Spending a few hours seeking gems in Gould's has always been a happy pastime for me. Sometimes could fine some nice electronics and science books. Now no more. They are opening a new shop in Newtown, but it will be much smaller and I doubt it will have that 'vast chaotic collection' atmosphere.Currently they have a massive sale on, $1 a book, fill a box for $10, and a huge pile of boxes of semi-random books for $1/box.As usual rummaging is a fairly random process. And take a torch, as they've cut way down on lighting.https://www.google.com/search?q=goulds+book+arcade&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjUufTZjdvdAhUKQd4KHZItBiMQ_AUIECgD&biw=1217&bih=864
Microwave antenna above apartment - safety? - Page 1
Forum section: electronics / general

author: Peacefrog
author_rank: Contributor
timestamp: September 26, 2018, 10:49:45 am
content: Hope this is OK to post in general chat! I'm looking to rent an apartment on the top floor, and there's a roof garden above containing a microwave antenna (I *think* to provide internet) - it's actually mounted above the apartment next door, but the beam is in line with a couple of the bedrooms. It's also not a huge antenna (~15cm?) and mounted about 1.5m above the roof itself.Would anyone on here have qualms with this setup? I *think* these antennas are pretty directional and it'd be safe, but curious to see what the opinion is.P

author: Halcyon
author_rank: Unknown
timestamp: September 26, 2018, 10:55:53 am
content: No issues what so ever.

author: Miyuki
author_rank: Frequent Contributor
timestamp: September 26, 2018, 11:00:41 am
content: This devices work with minuscule power levels like hundreds of mW to ones of W and connect just to direct visibility with just few degrees antennaThis is totally safe even to stand in front of antennaDifferent story will be huge transmitters with hundreds of watts or even kilowatts they can be dangerous but they have big restricted area around them

author: coppercone2
author_rank: Super Contributor
timestamp: September 26, 2018, 11:55:06 am
content: I think even the most careful people worried about microwave heating effects on the brain or other effects on the body would have a threshold of at least a few watts (as a point source antenna near your ear) over the years to make any sorts of claims.Distance + dirt + directivity losses = not much

author: Bud
author_rank: Super Contributor
timestamp: September 26, 2018, 05:30:56 pm
content: i used to live in an appartment on the top floor with a bunch of cell service antennas on the roof. I could not use my 900 MHz wireless headphones, they got jammed.
CPU socket repair and a flying fan - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 27, 2018, 10:38:42 am
content: Note- Only posting videos on Tuesday , Thursday and Sunday E.S.T.CPU socket repair and a flying fan - (PWJ112)Play with Junk12K1,160 viewsPublished on Sep 25, 2018I repaired some CPU sockets and I show you how I did it.
USB powered wall hook  - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 25, 2018, 04:28:14 pm
content: Why?

author: Gromitt
author_rank: Regular Contributor
timestamp: September 25, 2018, 07:10:03 pm
content: Have you looked at the video?It does actually explain why.

author: stj
author_rank: Super Contributor
timestamp: September 26, 2018, 05:28:48 pm
content: everything has to be USB these days - it's like a religion to some people.

author: coppercone2
author_rank: Super Contributor
timestamp: September 26, 2018, 06:34:28 pm
content: this is just fucking dumb

author: ajb
author_rank: Super Contributor
timestamp: September 26, 2018, 07:33:04 pm
content: With the ubiquity of USB this actually a pretty clever solution for providing a solidly mounted hook that's easily removed. If 3M Command hooks weren't a thing, this could be really useful. But they are, so it's kind of left without much a niche to fill. Actually, this still might be superior for rough surfaces, as long as there's enough glue, that's one area where Command hooks and similar tapes don't do so well.

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 26, 2018, 08:07:44 pm
content: V2 is going to have wifi and an app.Then your hook will be ready to remove when you get home.

author: coppercone2
author_rank: Super Contributor
timestamp: September 26, 2018, 09:21:56 pm
content: you know you can melt that glue with a cigarette lighter right?it marginally aids in removal, if you don't have access to a knife.

author: Fryguy
author_rank: Regular Contributor
timestamp: September 26, 2018, 10:06:08 pm
content: This is going to win the prize as the most retarded product of the year !Or can somebody present something more stupid than this ?
hFE gain ranking of transistors & the letter suffix - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: September 26, 2018, 07:36:45 am
content: Is there a chart somewhere defining the hFE binning ranges?Do these ranges stay constant across all transistors (i.e., if an "A" suffix on the p/n represents a beta of, say, 50-100 would it represent the same 50-100 range for any other transistor p/n?Thanks.

author: Benta
author_rank: Super Contributor
timestamp: September 26, 2018, 08:56:36 am
content: No, the letters are relevant only inside one transistor type.I'll give you an example: the well-known BC547 can be supplied as A, B and C, which divides the hFErange in three.The high-gain version, which it the BC549 will also come as A, B and C, but the actual hFEvalues are different.

author: cvanc
author_rank: Frequent Contributor
timestamp: September 26, 2018, 03:13:03 pm
content: Quote from: Benta on September 26, 2018, 08:56:36 amWow, that certainly makes things more complicated. Seems odd that this never got standardized?Quote from: Benta on September 26, 2018, 08:56:36 amOK, what happens if I buy the same transistors from a different manufacturer? Would they agree as to the markings & the beta range they signify? Or are all bets off if I dare to change brands?Many thanks.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 26, 2018, 03:35:27 pm
content: BC847(A-C) I think is consistent. 2Nxxxx is divided into numbers, often by Vceo grade but there are some hFE graded parts as well. Japanese numbers (2SCxxx, etc.) are whatever. Also, there's Korea Electronics (KEC) parts marked similarly, but they are actually KTCxxx and such.Tim

author: David Hess
author_rank: Super Contributor
timestamp: September 26, 2018, 03:37:25 pm
content: Quote from: cvanc on September 26, 2018, 03:13:03 pmDifferent transistor models have a different distribution of hfe.QuoteIf the part numbers are the same, then the beta ranges should be the same also although this is not part of the JEDEC registration.Older parts like the 2N5088/2N5089 tend to use different part numbers for different hfe ranges or colored dot markings like the 2N2926.

author: rsjsouza
author_rank: Super Contributor
timestamp: September 26, 2018, 03:40:19 pm
content: Quote from: cvanc on September 26, 2018, 03:13:03 pmAlways resort to the manufacturer's datasheet.For example, some of the best transistor datasheets were from Philips (I had a few of their books in the 80's), but over the years they removed most of the curve characteristics on several of their modern revisions.Old Philips:http://grabstore.ehv.campus.philips.com/voorraadmap/hfdst01_transistors/Datasheets_pdf_files/bc550.pdfNewer revision:https://media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/BC549,550.pdf
optical engineering youtube channels? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: September 21, 2018, 08:43:34 pm
content: So there is plenty of good EE Vblogs like mikeselectricstuff, eevblog, TSP and a few other very decent ones.There is plenty of good mechanical blogs like ox-tool-coThen there are some multidisciplinary ones like AVEBut is there anyone for optics? Stuff like telescopes, microscopes, binoculars, monoculars.. I don't mean photo camera performance but actual optical systems engineering/analysis that consist of mirrors and lens and whatever else. The laser blogs seem to focus more on power... but I have yet to see something like a professional tear down a binoculars in the dave jones analysis way

author: ogden
author_rank: Super Contributor
timestamp: September 21, 2018, 09:00:26 pm
content: Quote from: coppercone2 on September 21, 2018, 08:43:34 pmTried search?

author: coppercone2
author_rank: Super Contributor
timestamp: September 21, 2018, 10:11:54 pm
content: gee no. do dat?

author: LapTop006
author_rank: Unknown
timestamp: September 24, 2018, 06:16:47 am
content: In terms of written content theLensrentals bloghas a bunch of interesting optical details in their lens analysis & teardown posts, and if you dig in you can find details of the custom optical test equipment they've had made.

author: arthurhopkins
author_rank: Newbie
timestamp: September 26, 2018, 01:21:41 am
content: Quote from: ogden on September 21, 2018, 09:00:26 pmI have GoPro Hero 5 and I think its amazing and have outstanding performance.

author: chris_leyson
author_rank: Super Contributor
timestamp: September 26, 2018, 01:44:07 am
content: I gave up looking for good optics tutorials a long time ago. Any software that is out there tends to be difficult to use and expensive. The only time I did any optics design was for steering or deflecting a CO2 laser beam through a series of lenses and mirrors to get a 360 degree scan for a laser wire stripper. Had to work it out from first principals and do the ray tracing using a speadsheet. It worked so I couldn't have been that far off. It doesn't take that much maths to ray trace one or two lenses but a lot of time to derive everything from first principals.
Anyone have an OLD Dialight switch catalog?  Looking for datasheet - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: September 25, 2018, 01:51:23 pm
content: I have some really nice looking Dialight toggle switches, in factory sealed bags, with a 1985 date code.They look nice but I can't find the p/n online anywhere - too old. Does anyone here have a library that goes this far back?Here's what the bag says:571-2118-0502-01 (and at the end of the p/n, neatly handwritten on each bag, is the number 4... whatever that means)8525I mostly want to know the contact specs, I'm wondering if they are suitable for low level audio. Thanks!
OMG The Bigtrak is back!!  - Page 1
Forum section: electronics / general

author: liroi77
author_rank: Newbie
timestamp: September 24, 2018, 10:15:36 pm
content: Hello everyone!I want to buy a nostalgic gift for my uncle.I noticed that the new model of the Bigtrak can be bought at Amazon Prime at a really good price!I will be happy to know if this model can be programmed as in the old models.Thats the link:https://www.amazon.com/BBT-BIGTRAK-Bigtrak-Zeon-Limited/dp/B0035IZ85G/ref=sr_1_1?ie=UTF8&qid=1537825989&sr=8-1&keywords=bigtrakTnx for the helpers!

author: mac.6
author_rank: Regular Contributor
timestamp: September 25, 2018, 10:25:10 am
content: I don't miss mine. It was a frustration to program and I quickly got tired of it.

author: CJay
author_rank: Super Contributor
timestamp: September 25, 2018, 10:35:04 am
content: Oh yeah, but as a ready to go robotics platform it's great, even if I do suspect the OP of being a spammer.

author: rdl
author_rank: Super Contributor
timestamp: September 25, 2018, 11:11:10 am
content: https://www.robotroom.com/BigTrak.htmlI never had one even despite being thoroughly spoiled by my grandparents. I do remember looking at it in the Sears and J.C. Penney catalogs when making Christmas lists.
Hameg 8122 Universal Counter - teardown, repair and test - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 24, 2018, 02:04:49 pm
content: Hameg 8122 Universal Counter - teardown, repair and testKaizer Power ElectronicsPublished on Sep 24, 2018The Hameg 8122 is a programable universal counter / timer that has 3 inputs. Channel A and B from DC-150 MHz at 300 Vp-p and channel C from DC-1.6 GHz at 5 Vp-p.I accidentally broke a knob off the instrument when moving and while I wanted to repair it, I might as well give a teardown of the unit. Finding a replacement part was not easy, but a cheap alternative solution was found.
New Digi-Key feature: Tariff notice - Page 1
Forum section: electronics / general

author: Tomorokoshi
author_rank: Super Contributor
timestamp: September 24, 2018, 05:38:13 pm
content: Parts of Digi-Key that are affected by the new tariffs are flagged as such.

author: georges80
author_rank: Frequent Contributor
timestamp: September 24, 2018, 09:18:43 pm
content: Yep, ordered stuff today and noticed the new notice.Just what we need, a new tax which is really all this is - certainly not like this is going to move 'jobs' back into the US.Digikey shows tariff pending (if they still have 'old stock') and tariff applied if it's old stock. On anything shown to have originated from China and for sale/delivery within the US. 25%...cheers,george.

author: rstofer
author_rank: Super Contributor
timestamp: September 24, 2018, 09:20:58 pm
content: Grizzly Tools does the same kind of thing except that they include the tariff in the final price:https://www.grizzly.com/products/10-x-22-Benchtop-Metal-Lathe-with-DRO/G0602Z
Carver MXR2000 Part2 - "The Magnetic Field Power Supply " - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 23, 2018, 10:10:55 pm
content: Carver MXR2000 Part2 - The Magnetic Field Power SupplyPublished on Sep 23, 2018In part 2, we look at the power supply. The first 30 minutes or so contains a lot of theory. Skip ahead if you want to see the measurements on the power supply.

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: September 23, 2018, 10:16:27 pm
content: Nice teardown and commentary. Can't wait for more on this.

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 23, 2018, 10:20:38 pm
content: Agree , I was waiting to see the "flux capacitor" connected to the Triac !

author: glarsson
author_rank: Frequent Contributor
timestamp: September 24, 2018, 07:36:29 am
content: Odd that Carver built their own diac using four transistors. Was this cheaper than a diac or do they trigger the triac in a way that is not possible with a standard diac?

author: SeanB
author_rank: Super Contributor
timestamp: September 24, 2018, 08:28:00 am
content: That way they could select the 4 transistors for breakdown voltage, and get matched sets, so the triggering is symmetric (not guaranteed for the run of the mill diac) and thus there is no long term DC component through that really small power transformer. That also had the side benefit of making the power dissipation a shared item across 4 large devices, removing a lot of the thermal drift as well.They probably used the same transistor elsewhere in volume, so simply doing an incoming binning for those within a specific set of parameters, and taking components for sections out of the same bins for every version, made sense for them in ensuring all the units were consistent, and they had more control over process spreads. They also had the incident add on of only having Carver supplied parts working well in repairs, as the circuits were optimised for narrow gain spreads and other parameters.
Solar roads: results are in (what a surprise...)  - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: September 23, 2018, 08:35:41 pm
content: Well, no surprises...for those interested , check it out:https://theconversation.com/solar-panels-replaced-tarmac-on-a-motorway-here-are-the-results-103568

author: Brumby
author_rank: Unknown
timestamp: September 24, 2018, 02:49:22 am
content: Purpose built solar farm style installation costs 10% of a solar road and works 3.5 times more efficiently. That makes the solar farm approach35 timesbetter - and that's not even taking into account maintenance costs.Hands up anyone who is surprised by this.Anyone?Bueller ... ? Bueller ... ?

author: Red Squirrel
author_rank: Super Contributor
timestamp: September 24, 2018, 04:50:02 am
content: But solar farms are so yesterday, we need something hip and trendy that investors will be interested in! Sadly how the world works though... and it's ridiculous.People keep trying to reinvent ways of installing solar when it does not need to be reinvented. All that effort should be put towards making panels more efficient or put into battery tech. Those are two areas that can always use continuous improvement and would have a much bigger impact.
Carver MXR2000 AM/FM Receiver  Part1 - First Look &  Repair  - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 23, 2018, 02:15:44 am
content: Carver MXR2000 Part1 - First LookxraytonybPublished on Sep 22, 2018l
TSP #132 - mm-Wave  Teardown, Analysis & Experiments on Generation & Detection  - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 17, 2018, 03:27:12 am
content: TSP #132 - Quest for mm-Wave Capability: Teardown, Analysis & Experiments on Generation & DetectionThe Signal PathPublished on Sep 16, 2018In this episode Shahriar demonstrates the effort for collecting affordable components and instruments in the past year to be able to generate mm-wave frequencies in the lab. The main goal is to generate synthesized CW signals beyond 26.5GHz and to be able to analyze them on the Keysight MXA Spectrum Analyzer.

author: khach
author_rank: Contributor
timestamp: September 23, 2018, 11:05:43 am
content: Some useful info fromhttps://literature.cdn.keysight.com/litweb/pdf/83554-90001.pdf
Looking for a Kit like this that's DIY! - Page 1
Forum section: electronics / general

author: wade7575
author_rank: Contributor
timestamp: September 23, 2018, 04:16:51 am
content: I'm looking for a smd flashlight kit I can build myself but I have not been able to find anything ebay or amazon and google did not turn anything up either.I seen a few guys on youtube a few years back that made a their flashlight like device that was more like a round rind with smd leds and they put power to them,I know the one guy made one so strong he could light up his whole backyard with ease and would most likely piss off the neighbors,I'm not looking for anything that powerful just something that I can build as a kit.I'm looking for something that looks like this and it's fine if I have to find my own power source for it.https://www.ebay.com/itm/30W-5730-Pure-White-LED-Light-Emitting-Diode-SMD-220V-85mm/311655435462?_trksid=p2485497.m4902.l9144https://www.ebay.com/itm/12W-80mm-Dia-Double-Lights-48-SMD-5730-LED-Light-Downlight-Aluminum-Base-Plate/232851439181?_trksid=p2485497.m4902.l9144

author: Habropoda
author_rank: Regular Contributor
timestamp: September 23, 2018, 04:44:31 am
content: Try here for DIY flashlight discussions:http://budgetlightforum.com/forum/otherled/modsThis is a good source for quality parts:https://www.mtnelectronics.com/index.phpAs I recall, Banggood and Fasttech have lots of cheap flashlight parts.

author: wade7575
author_rank: Contributor
timestamp: September 23, 2018, 06:13:49 am
content: I will give those links a look after thanks a bunch.
Teardown, Repair & Analysis of an Agilent N5230A 13.5GHz PNA-L Network Analyzer - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 23, 2018, 12:44:05 am
content: TSP #134 - Teardown, Repair & Analysis of an Agilent N5230A 13.5GHz PNA-L Network Analyzer (Part 1)The Signal Path55K132 viewsPublished on Sep 22, 2018The Signal Path
PAVE PAWS Early Missile Warning Radar - Page 1
Forum section: electronics / general

author: rstofer
author_rank: Super Contributor
timestamp: September 22, 2018, 09:26:52 pm
content: Interesting!Now we're about to spend $866 million to upgrade the systems:https://www.militaryaerospace.com/articles/2018/06/military-radar-upgrade-missile-attack.html
Overcharged FLA - Page 1
Forum section: electronics / general

author: metrologist
author_rank: Super Contributor
timestamp: September 21, 2018, 05:25:50 pm
content: I put a dry stored FLA into service on my solar panel a couple months ago and just forgot to reduce the charge voltage from 14.1V to 13.5V for a float charge (I used the default B-3 setting for FLA). I noticed several of the cells have low fluid level, down around 50%.This got me wondering about service vehicles that run pretty much all day, such as police or mass transit vehicles. I recall these systems typically charge and hold the voltage well over 14V, so are these batteries constantly being overcharged? I've not heard it as a problem, however. If it is not a problem, then I wonder why my battery boiled off so much fluid?

author: SeanB
author_rank: Super Contributor
timestamp: September 21, 2018, 08:09:33 pm
content: Most modern car alternators drop the voltage as they heat up, so as to reduce water boil off in the battery. The batteries however still fail after a few years because they are never serviced, just run till dead from lack of water. Your battery probably did not lose too much capacity if you caught it early enough, though the cells definitely lost material dropped off from lack of electrolyte, and you probably took a year off the battery life.The car alternator will typically start at cold bringing the battery up to 14V0, then it will taper off the charge voltage as the engine warms up, going down to 13V6 when at operating temperature, and if you have heavy loads ( idle engine, AC and lights on) it will drop down to 13V3 after a while as the alternator is no longer capable of handling the running current so a balance is reached. More modern cars the ECU actually controls the alternator, and does a similar thing to fast replace the energy used in starting, then does a temperature and load compensated maintenance charge on the battery, as it warms up and terminal voltage drops.
Decapping integrated circuits - Page 1
Forum section: electronics / general

author: Jane
author_rank: Frequent Contributor
timestamp: September 20, 2018, 06:21:58 pm
content: I would like to replace an integrated circuit on a mainboard. A problem is that a manufacturer removed any text on the circuit. If I decap the circuit (in a nitric acid) I can see the inner circuits. Is it common a manufacturer put a model number on the wafer( inside of the circuit) or not?Anyone knows?

author: SeanB
author_rank: Super Contributor
timestamp: September 20, 2018, 06:48:31 pm
content: Pretty common to have a number there along with manufacturer logo, though for some that is not too easy to transfer to a part number, but does give a good idea as to function.

author: ataradov
author_rank: Super Contributor
timestamp: September 20, 2018, 06:52:13 pm
content: It is actually very rare to see the actual part number on more or less complex parts. Usually you see a mask number, since the part number may change at any time on a whim of a marketing department.

author: amyk
author_rank: Super Contributor
timestamp: September 21, 2018, 12:18:09 am
content: Probably easier to identify from function, package, and pinout.You can add more information and people here may give it a go.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: September 21, 2018, 12:20:39 pm
content: There was a thread here some time back of someone acid etching/decapping ICs. If you could find that thread originator, could possibly shine some light on your question.
Aluminum etching - Page 1
Forum section: electronics / general

author: generic_username
author_rank: Regular Contributor
timestamp: September 18, 2018, 02:43:58 pm
content: Hello everyone,Maybe one has some insight on aluminum etching, using etched AL for antenna design for smartcards seems to be pretty common.The basis material is often PET and then the traces are etched AL.And I was wondering how do they connect the microchips with the AL?AL has the nasty habit of building an oxide coating pretty fast.I found a hobbiest way to solder on AL chassis, which is coating the area with engineoil and then solder it normally.So I found a datasheet from a japanese company which does antenna etching for smartcards and the following methods are listed as attached.But I have no Idea what those bonding methods are as there's no explanation and a google searxh did not bring me any luck yet.cheers.

author: helius
author_rank: Super Contributor
timestamp: September 18, 2018, 02:51:05 pm
content: The pads on the IC itself are most commonly aluminum (the only alternative to aluminum interconnect is copper, and it is less common especially for lower cost products). The aluminum pads on the IC are connected to aluminum (or copper, etc) circuit traces using gold wire bonding.

author: generic_username
author_rank: Regular Contributor
timestamp: September 18, 2018, 03:35:39 pm
content: Thank you for your reply.After I googled the shortcuts with keyword "chipbonding" I finally found what they meanACF= anisotropic conductive filmNCF=? non-conductive film?ACP=anisotropic conductive adhesive pasteNCP=non-conductive adhesive pastedid I get that right?cheers.

author: helius
author_rank: Super Contributor
timestamp: September 18, 2018, 07:44:18 pm
content: ACF = anisotropic conductive filmNCF = non-conductive filmACP = anisotropic conductive pasteNCP = non-conductive pasteThe idea is that by sticking a layer of adhesive (film or paste) between the chip and the substrate, you can connect the chip's pads to wires in the substrate. But if the adhesive were conductive, it would conduct between the pads, which would be a short circuit. Anisotropic conductive materials only conduct along one axis (they are also called Z-axis conductive adhesives): they are nanomaterials that contain millions of short nickel fibers, aligned in a strong magnetic field. The fibers conduct across the thin part of the adhesive but not along the wide part. The non-conductive adhesives are applied using pressure so that the pads on the chip make point contact with the wires in the substrate.

author: generic_username
author_rank: Regular Contributor
timestamp: September 19, 2018, 11:58:19 am
content: Thank you that was very informative.

author: coppercone2
author_rank: Super Contributor
timestamp: September 19, 2018, 01:09:57 pm
content: If you wanna solder it go to the welding store and buy aluminum solder and the special acid flux they have for it and follow the directions

author: generic_username
author_rank: Regular Contributor
timestamp: September 21, 2018, 06:38:19 am
content: thank you but I was only generally interested how'd you contact aluminum etched products
How about eevblog branded uRuler App? - Page 1
Forum section: electronics / general

author: hismaimai2000
author_rank: Newbie
timestamp: September 20, 2018, 07:33:13 am
content: Won't it be nice to have an android app which asks you your screen size,the first time you run it and then displays the actual size of traces of components?Note: i can do the graphic design but i'll need a programmer

author: JPortici
author_rank: Super Contributor
timestamp: September 20, 2018, 08:11:06 am
content: you can get the actual screen size (resolution and dpi) from the OS so no need to enter it manuallybesides that, cool idea!+1

author: Halcyon
author_rank: Unknown
timestamp: September 20, 2018, 10:47:52 am
content: Can we please not call Applications an "App". We aren't teenage girls or hipsters. The English language is already bastardised enough to cater for the lazy and moronic.

author: Rerouter
author_rank: Super Contributor
timestamp: September 20, 2018, 10:50:13 am
content: On a technicality, would this not simply be a vector image displaying program with panning, always locked to 1:1 scaling?

author: Sparky49
author_rank: Regular Contributor
timestamp: September 20, 2018, 01:59:04 pm
content: Quote from: Halcyon on September 20, 2018, 10:47:52 amIsn't "App" a shortening of "Application"? Just like "aren't" is a shortening of "are not"?Really activates the almonds...

author: Mr. Scram
author_rank: Super Contributor
timestamp: September 20, 2018, 03:15:33 pm
content: Quote from: Halcyon on September 20, 2018, 10:47:52 amHave you written to Apple about how they mislabeled their App Store yet? Or Google? Damn those leading technology companies for getting their own terminology wrong. I guess they must've never noticed!

author: LeoTech
author_rank: Regular Contributor
timestamp: September 20, 2018, 03:56:02 pm
content: This sounds like an awesome idea and I'd definitely like to contribute in anyway.It doesn't even sound that complicated to do, although I do have to admit that my experience regarding software on mobile devices is very limited.+1Leo

author: JPortici
author_rank: Super Contributor
timestamp: September 20, 2018, 07:20:52 pm
content: About that, at work i code the occasional app with basic4android. It was rather easy to get into, much easier than android studio.given that i know jack about java..

author: Halcyon
author_rank: Unknown
timestamp: September 20, 2018, 10:26:54 pm
content: Quote from: Mr. Scram on September 20, 2018, 03:15:33 pmI couldn't care less what they think. It's not terminology, it's marketing wank.

author: onesixright
author_rank: Frequent Contributor
timestamp: September 20, 2018, 10:33:38 pm
content: I can have a look for iOS if you need someone. Just send me a PM.Sent from my iPhone using Tapatalk
Help needed on MSFT licensing - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: September 20, 2018, 02:39:48 am
content: I purchased Vision Std and Visio Pro, both on My Choice Software.The Visio Std can be registered under My Office account, but the Visio Pro can't. It can still pass MSFT validation and activation, but it won't show in My Office account.Now here's the problem. Before I bought my Visio Std, Visio Pro works fine after I log into my MSFT account.With the new Visio Std added in my account, the Visio Pro tries to check out the Std license (only one) from my account every time it signs in.That means, not only I'm not able to use my Pro license if I choose to sign in to my MSFT account, it also violates the single license, single computer agreement.My question: how to prevent Visio from checking out licenses from my MSFT account, and use its offline license, while still keep OneDrive-Office integration working?
Does anyone have a Huawei P20 Pro? - Page 1
Forum section: electronics / general

author: Lord of nothing
author_rank: Super Contributor
timestamp: September 22, 2018, 11:22:34 am
content: HiSomeone still know I need a Cam and I want buy a Phone. The Huawei P20 Pro look good.Especially the Cam look nice. Does anyone here use it? The next Problem in 2 Weeks I book a very cheap flight and will some make good looking Pictures.THX!

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 22, 2018, 12:26:24 pm
content: Try searching XDA.
Keysight UXR 110GHz BW, 256GS/s, 10-bit Real-Time Oscilloscope Teardown - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 19, 2018, 03:19:17 am
content: TSP #133 - Keysight UXR 110GHz BW, 256GS/s, 10-bit Real-Time Oscilloscope Teardown & ExperimentsThe Signal PathPublished on Sep 18, 2018In this episode Shahriar takes a look at one of the most advanced electrical test and measurement instruments ever created. The Keysight UXR-Series Real-Time Oscilloscope brings 110GHz of analog bandwidth and 256GS/s real-time sampling at 4-channels simultaneously. To make it even more impressive, the entire data-conversion architecture is in 10-bits. This implies that the instruments captures, processes

author: drussell
author_rank: Super Contributor
timestamp: September 19, 2018, 05:24:06 am
content: There is another thread about this amazing unit already:https://www.eevblog.com/forum/testgear/something-amazing!-keysight-uxr-110ghz-256gss-10-bit-scope-teardown-exp/Absolutely mind blowing.
Hakko 936 solder station knock-off issues - Page 1
Forum section: electronics / general

author: mrcrud5
author_rank: Contributor
timestamp: September 18, 2018, 01:08:51 pm
content: Hi all,So I have a this Hakko 936 knock-off called a Yihua 936. The other day while soldering I noticed a bunch of the LEDs on my project light up while I was soldering. This makes me a little concerned that my solder iron may have some kind of voltage at the tip that may be damaging my components. Should I be concerned? Is there a test I can do to check to see if my solder station is safe to use?

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: September 19, 2018, 12:16:14 am
content: Measure tip to ground...should be no more than 2ohms. Good idea to trace back the ti-ground path thru Iron and station to see where its connected, .

author: amyk
author_rank: Super Contributor
timestamp: September 19, 2018, 01:18:00 am
content: It can either be the field from the heater, or the station and cord are acting as an antenna and picking up ambient fields.LEDs do not need much current to light.https://www.eevblog.com/forum/chat/led_s-light-when-soldering/https://www.eevblog.com/forum/beginners/led-powered-by-soldering-iron/https://www.eevblog.com/forum/beginners/soldering-iron-is-giving-off-usable-power/
Encoders for the Heavy Duty Market - Page 1
Forum section: electronics / general

author: LearningS
author_rank: Newbie
timestamp: September 18, 2018, 02:40:55 pm
content: Hi allthis forum is amazing to learn more about T&M, however, do you know if something like EEVblog also exists for machine manufacturing? I am doing market research in the needs/challenges for rotary encoders in the Heavy Duty market and would like to get some inputs through a forum as people tend to be quite open via this channel.Many thanks in advance!

author: Pack34
author_rank: Frequent Contributor
timestamp: September 18, 2018, 05:50:19 pm
content: Define heavy duty. If it's an environment that the encoder housing could come into contact dust, dirt, or grease you could look at inductive encoders from Zettlex.

author: jmelson
author_rank: Super Contributor
timestamp: September 18, 2018, 07:17:23 pm
content: check out CNCZoneJon

author: floobydust
author_rank: Super Contributor
timestamp: September 18, 2018, 07:46:36 pm
content: Industrial rotary encoders usually get beat up outside - from oil, water, dirt, CNC coolant, metal shavings etc.The housing gets hit, the cable and connector get hit and crushed - by accident.I found little point to paying big dollars for an encoder that is ruined from the outside. They just aren't well-protected from the environment.The shaft coupler/bellows is also fragile, so I cover that and Loctite the set screws so they don't loosen.Best solution I have, is to get fab to weld up a protective cover/cage over top the encoder. This way they last much longer.

author: Vtile
author_rank: Super Contributor
timestamp: September 18, 2018, 08:03:39 pm
content: PLCtalk.net
Older test gear found on Ebay UK - Page 1
Forum section: electronics / general

author: Terry01
author_rank: Frequent Contributor
timestamp: August 23, 2018, 07:39:31 am
content: I came cross this seller while scouting around Ebay as you do looking for the needle in the haystack!I think some of his stuff is reasonably priced and some of the other stuff is quite expensive but everything seems to be up for an offer so who knows? I haven't bought anything from him/or her so don't know how much they will bend on price.Anyways I know some of you like to bring the older stuff back to life or just collect it so thought i'd share. I love seeing the old test equipment brought back to a working state and even better if it is used regularly once fixed up. There is some good stuff mixed in amongst all the helicopter etc stuff I think!Do post if you get anything decent or whatever.http://stores.ebay.co.uk/id=273971585?ssPageName=STRK:MEFSXS:MESST&_trksid=p2053788.m1543.l2653

author: InductorbackEMF
author_rank: Regular Contributor
timestamp: September 18, 2018, 06:01:36 am
content: Neat will take a look i love older gear.

author: Terry01
author_rank: Frequent Contributor
timestamp: September 18, 2018, 09:04:19 am
content: Cool, i hope you find something! I've checked in a couple of times and he seems to regularly have some decent, if "random" stuff in among all the helicopter and flying stuff.I hope you get something interesting!

author: NivagSwerdna
author_rank: Super Contributor
timestamp: September 18, 2018, 09:27:44 am
content: https://www.ebay.co.uk/itm/Universal-Counter-9835-3/323321761609?hash=item4b477a8f49:g:kM4AAOSw2j9bNNOJif you like Nixieshttps://www.ebay.co.uk/itm/HP-Hewlett-Packard-54602B-150MHz-Oscilloscope/222896754527?epid=1666651398&hash=item33e5ae8f5f:g:xYEAAOSwsGlatkziI made a Best Offer on a different item but the seller didn't seem to be at my level; TBH I think the items are quite pricey.

author: tggzzz
author_rank: Super Contributor
timestamp: September 18, 2018, 09:44:55 am
content: He seems quite canny, with a realistic idea of how easy things will be to shift.Components seem to be sold with a 40-50% discount, good test equipment with 10%, older less desirable test equipment with 20-40% discount.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: September 18, 2018, 10:52:55 am
content: Quote from: tggzzz on September 18, 2018, 09:44:55 amAnd probably not in a hurry

author: bd139
author_rank: Super Contributor
timestamp: September 18, 2018, 11:15:24 am
content: Some of the pricing is way off sensible. He's looked at historical sale prices, added 20% and then will take a 20% offer. No bargains to be had.
Help sourcing boxes for single reel - Page 1
Forum section: electronics / general

author: Cloud
author_rank: Regular Contributor
timestamp: September 18, 2018, 09:47:48 am
content: Which company can you recommend me for a supplier for shipping boxes for 7" reels in Europe. I have searched half of the internet and couldn't find anything that would suit me

author: LapTop006
author_rank: Unknown
timestamp: September 18, 2018, 11:06:40 am
content: I'd dig up the companies that make cardboard folded shipping boxes for vinyl records, many of those can handle a reel thickness easily enough. Most of the reviews (random example) are for the 12" LP mailers, which probably work well enough, but some of the manufacturers will almost certainly have 7" versions.
Inside a Two-Quadrant Power Supply - Agilent 66312A Teardown - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 18, 2018, 04:01:33 am
content: This video is for Dave !!Inside a Two-Quadrant Power Supply - Agilent 66312A Teardown and ExperimentKerry WongPublished on Sep 17, 2018In this video, I did a teardown of an Agilent 66312A dynamic measurement DC source and took a look at its characteristics and controlling the power supply via PC using the RS232 port with a null modem cable.

author: pigrew
author_rank: Frequent Contributor
timestamp: September 18, 2018, 06:10:14 am
content: Decent video, though I got a bit scared by the handling of the PCBs. I try to hold them by the edges only to attempt to avoid getting oil on them (especially near sensitive analog circuits).Were all the capacitors good? I find them hit and miss in equipment this oldI have a 66309D which is somewhat similar to this unit. I wrote a UI for it (Windows .Net) that you may want to try (although it is buggy and would need to be updated to support the 66312A) Seehere.Perhaps you can try powering a cell phone or microcontroller with it, and watch the current consumption.

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 18, 2018, 10:41:59 am
content: I would have like to seen how he got 100 percent of the dust out of the unit just using the alcohol