hybridfree/eevblog-posts huggingface dataset:
Fake Nextion display ? - Page 1
Forum section: electronics / general

author: RogerClark
author_rank: Contributor
timestamp: February 20, 2019, 09:27:06 am
content: I bought a 2.4 inch Nextion display from a eBay vendor, and it seems to be slowly going wrong, and I'm trying to work out if its a clever fake..The display claims to be a Nextion NX3224T024_011 but does not have the ITead logo on it, and the PCB layout does not match the official photohttps://nextion.itead.cc/resources/datasheets/nx3224t024_011/When I first got it, and tried to upload via micro SD, it failed to update, so I connected it via a USB to Serial adaptor and I was able to upload data, and it seemed to work OK.Subsequently, when I tried to upload again, the Nextion editor would no longer recognise the board, even though it worked when I sent it commands data.My guess is that the Serial Tx line stopped working, but the Serial Rx was still working.Since I couldn't update via serial, I tried a few old micro SD cards and finally found one it would recognise and was able to upload again a few times.But its now stopped receiving data via serial.Hence I'm now trying to figure out if this is an authentic Nextion or a clone / fake. The vendor (in China) insists its a "different time" of board. I don't know if they mean an old board, or a different "type" of board.In terms of what seems to have failed, it appears to have either diodes or resistors between the Serial Rx and Tx inputs and GND.But I measured these components and they read less than 1k. One of them reads slightly differently front to back, but that could be the STM32F030 I'm partially measuring, as its impractical to remove those components as they are SMD.I have a feeling that these may be protection diodes of some kind, and they may have been damaged somehow. But I can't see how that could have happened.BTW. I can't find a schematic for a Nextion display, despite the official ones appearing to have the open source hardware logo on them ;-)

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: February 22, 2019, 08:06:28 am
content: Quote from: RogerClark on February 20, 2019, 09:27:06 amThat is just the Itead logo I think? Any similarity to the OSH gear logo is probably coincidental.Anyway, Nextion is not Open Soucehttps://nextion.itead.cc/faqs/Your board could be a clone of a clone... IP just gets passed around China and each time people substitute cheaper components until finally it's just a space model.

author: RogerClark
author_rank: Contributor
timestamp: February 22, 2019, 09:29:05 am
content: ThanksThe serial Tx and Rx have now totally failed on the board, so I'm trying to get a refund, but so far they only offered me 25% of what I paid.I'll probably have to write it off to experience, and perhaps salvage the TFT panel and touch screen and use with a separate MCU.If I could be bothered I could remove the STM32F030 and replace with something a bit better, possibly a F103 or even a small STM32F4 but I doubt its worth the effort and risk of damaging the PCB by using my hot air rework tool
dr over ds times ds over dt - Page 1
Forum section: electronics / general

author: vlad777
author_rank: Frequent Contributor
timestamp: February 20, 2019, 06:17:54 pm
content: Can somebody please explain to me how did he get this equation at 23:01 ?Where does it come from?Did he derive with respect to ds or what?Where exactly does he use the chain rule?He has dr/dt and then ds jumps into picture somehow.Many thanks.

author: ebastler
author_rank: Super Contributor
timestamp: February 20, 2019, 07:34:17 pm
content: It's just an application of the general "chain rule", as he states while writing it.https://en.wikipedia.org/wiki/Chain_rule

author: vlad777
author_rank: Frequent Contributor
timestamp: February 20, 2019, 07:47:07 pm
content: So he is saying that r is a function of s and s is a function of t.Is that right?

author: ebastler
author_rank: Super Contributor
timestamp: February 20, 2019, 07:51:36 pm
content: Yes, that's right.

author: rstofer
author_rank: Super Contributor
timestamp: February 21, 2019, 11:34:03 pm
content: He wants to get that T vector (dr/ds) and he has dr/dt and ds/dtThis makes sense since he starts with a velocity vector (has speed and direction) and breaks it down to a tangent vector for direction and and a scalar speed (which has only magnitude, no direction.
Transflective tft - Page 1
Forum section: electronics / general

author: kathy
author_rank: Contributor
timestamp: February 20, 2019, 04:38:30 am
content: What about the display effect for your transflective tft? is it cost effective?the things you may know for transflective tfthttp://www.szmaclight.com/new/things-you-may-know-transflective-tft.html
Knowledge base favourite - Page 1
Forum section: electronics / general

author: BFX
author_rank: Frequent Contributor
timestamp: December 28, 2018, 03:49:13 pm
content: Hi all electronics enthusiast;)I would like to start this thread like a summary of new technology news to help us to do better designs.What I expect here is some new application notes ,new parts, new research in electronics, new patents and so on.TBH please don't fill this thread by out of topic contribution like it happen in lot of threads. (it's electronics/engineering forum. "I wish it was")Why I started this thread? I'm signed-in to some news like Keysight newspaper and EDN and so on but everyone has its own preference's.Therefore I expect some "gold nuggets" from your part which you recognize it appropriately to share with us.Please do not write here some long stories if it's not related to this topic.The best is only add some link to note or pdf as attachment and some explanation why it is so interesting. If some is really interesting please create new thread related to that.I hope I made a good move from my side

author: BFX
author_rank: Frequent Contributor
timestamp: December 28, 2018, 04:02:51 pm
content: I'll start this thread by interesting capability of Keysight x series scopes.Bode plot is also very usefulI'm wondering if USB protocol decoding is able to activate on 3000 Serieshttp://app.connection.keysight.com/e/er?elq_cid=1762183&cmpid=7012L000000xs6V&s=609785623&lid=2416&elqTrackId=ec9568a841b34b598f11045f169d6cb6&elq=a0a31422c3f2409e81ddf8c60ebe4b2a&elqaid=3945&elqat=1http://app.connection.keysight.com/e/er?elq_cid=1762183&cmpid=7012L000000xs6V&s=609785623&lid=2216&elqTrackId=1aae18e45d484c9d908cd986b829e4d9&elq=a0a31422c3f2409e81ddf8c60ebe4b2a&elqaid=3945&elqat=1

author: BFX
author_rank: Frequent Contributor
timestamp: February 19, 2019, 08:44:08 pm
content: embedded world 2019The best conference in Europe !!!https://www.embedded-world.de/enand free tickets (ew19web or B401492)https://www.embedded-world.de/en/visitors/tickets/voucherHave a nice day and see you there ... eevblog stamp will be at my Canon camera strap belt
Scientist destroys Maxwell. Panic and confusion in small town in Germany - Page 1
Forum section: electronics / general

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 03:10:14 pm
content: Karlsruhe Institute of Technology: Nonlinear Theory of Electrodynamicshttp://www.math.kit.edu/ianm4/seite/ma-electrodynamics/enThere is also a podcast in english.

author: Echo88
author_rank: Frequent Contributor
timestamp: February 19, 2019, 04:31:02 pm
content: Scientists hate him because of this small trick. Click here to find out.

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 05:19:26 pm
content: Shocking: Famous Repair Technician Ends Marcony Era Radio in a single podcast.https://theamphour.com/430-shahriar-discusses-5g/:S He also has hobby of being scientist. .. But science is dirty word since the Kirchhoff's Law was found to be all lies.

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 05:51:39 pm
content: Cruel World:Electrical Engineer Unleashes Scary Contraptions, Thrives on Fears of Unsuspecting Publichttps://www.youtube.com/channel/UCJ0-OtVpF0wOKEqT2Z1HEtA

author: schmitt trigger
author_rank: Super Contributor
timestamp: February 19, 2019, 05:54:56 pm
content: Subscribing to make a comment later

author: coppercone2
author_rank: Super Contributor
timestamp: February 19, 2019, 05:59:53 pm
content: Im gonna advertise shoes in this post in case it gets popular like schmitt trigger

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 06:17:01 pm
content: Dark Corners:In Rare Footage, Hackers Break the Secrets Hidden Inside the ChipP.S. someone actually has posted this earlier, but I can not find the original post

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 07:17:14 pm
content: Abuse Report:RF Engineers in Their Mad Cruelty Apply Electromagnetic Analysis.But One Designer Says "It Is Simply Butchering"http://www.simberian.com/Presentations/AvoidButcheringSParameters_Shlepnev.pdf

author: coppercone2
author_rank: Super Contributor
timestamp: February 19, 2019, 07:55:24 pm
content: can you rename this thread to skanky engineering stories?

author: unitedatoms
author_rank: Frequent Contributor
timestamp: February 19, 2019, 07:57:06 pm
content: Proof Found and Lost: Mathematicians are Failing Arithmetics. Academia Establishments Globally Are at Risk of Disbandmenthttps://mathwithbaddrawings.com/2017/01/11/why-are-mathematicians-so-bad-at-arithmetic/7
Why c ("the speed of light") must be limited - Page 1
Forum section: electronics / general

author: apis
author_rank: Super Contributor
timestamp: January 29, 2019, 11:18:12 pm
content: This is the best* explanation of the significance of the so called 'speed of light' and why it must be limited (and at the same time why relativity must be correct) that I have seen:* in under 13 minutes.

author: bsfeechannel
author_rank: Super Contributor
timestamp: February 18, 2019, 09:40:45 pm
content: Awesome. This one is another take on the topic in 8:36.
Reversing polarity in LED to produce cool down effects on nearby components - Page 1
Forum section: electronics / general

author: GilbouFR
author_rank: Contributor
timestamp: February 18, 2019, 12:49:30 pm
content: https://phys.org/news/2019-02-reverse-cool-future.html

author: jmelson
author_rank: Super Contributor
timestamp: February 18, 2019, 09:37:15 pm
content: Wow,So, this is the LAD, ie. Light Absorbing Diode!Pretty cool, but may not have practical applications, due to the nanometer spacing and such.Jon

author: GilbouFR
author_rank: Contributor
timestamp: February 18, 2019, 10:04:08 pm
content: We are years from its use but perhaps Intel could use some well placed LED diodes inside processors as a proof of concept ?

author: Refrigerator
author_rank: Super Contributor
timestamp: February 18, 2019, 10:32:03 pm
content: Seems like keeping the distance might be a challenge.
Two Mysteries of Chinese eBay Products - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: February 23, 2019, 05:40:50 am
content: I have over many years of watching videos tearing down Chinese made eBay products (The super cheap kind.) two consistent things, first, the fuses are fitted to the neutral line rather than the positive. Second no earthing (In the example video below, the earth wire is there and properly crimped, but not connected even though a place had been prepared for it.). Does anyone have any ideas (good ones) why either of these things might be the case.

author: aargee
author_rank: Frequent Contributor
timestamp: February 23, 2019, 06:55:23 am
content: I would think absolutely zero need and hence zero interest in safety for unregulated exported products.

author: ozcar
author_rank: Frequent Contributor
timestamp: February 23, 2019, 07:08:37 am
content: I suspect the fuse is not always in the neutral.This is one of those UV "nail lamps". I confirmed the brown wire coming in is the active. Well, theyalmostgot the fuse in the active.

author: jfiresto
author_rank: Frequent Contributor
timestamp: February 23, 2019, 07:19:12 am
content: Quote from: Deodand2014 on February 23, 2019, 05:40:50 amTheSchuko mains plugused by the blue European countries below is unpolarised, so perhaps half the time, the fuse will be on the hot side.

author: magic
author_rank: Super Contributor
timestamp: February 23, 2019, 08:41:54 am
content: All the blue and red countries also use these plugs for unearthed equipment:https://en.wikipedia.org/wiki/EuroplugI don't know if it's a good thing or not. On the downside, we can only have global RCDs and many-amp circuit breakers rather than per-device fuses to interrupt line to earth shorts. Unless you put fuses on both lines, which nobody seems to do. On the upside, it very effectively prevents sloppy designers from using earth and neutral interchangeably
I found an old Dave Jones video..... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: February 14, 2019, 04:56:03 am
content: Enjoy...

author: Ranayna
author_rank: Super Contributor
timestamp: February 14, 2019, 10:02:50 pm
content: Hmm, I had this in my feed today. I wonder if having the video embedded here triggered that.I do not remember if a video that was embedded somewhere ever turned up in my feed without having watched it...

author: Domagoj T
author_rank: Frequent Contributor
timestamp: February 14, 2019, 11:01:48 pm
content: Dave hates cat videos?Dave? Here's a two hour cats special.

author: metrologist
author_rank: Super Contributor
timestamp: February 15, 2019, 12:45:53 am
content: That video was all Dave, AND it was less than 6 minutes long!!!!!!!!!!!I want to watch it again. I have time

author: Mr.B
author_rank: Unknown
timestamp: February 15, 2019, 12:51:41 am
content: The video has been on the EEVBlog *About* page forever...https://www.eevblog.com/about/

author: EEVblog
author_rank: Unknown
timestamp: February 15, 2019, 04:52:00 am
content: There are far worse and older videos than that...

author: Refrigerator
author_rank: Super Contributor
timestamp: February 18, 2019, 08:42:37 pm
content: Quote from: EEVblog on February 15, 2019, 04:52:00 am*keyboards start clattering while smoke billows out of multiple computers as they push every known search algorithm to the limit*
Why did Keysight open in my Browser? - Page 1
Forum section: electronics / general

author: metrologist
author_rank: Super Contributor
timestamp: February 15, 2019, 05:33:56 am
content: I came home and turned on my PC. I opened my browser to my local home page and then read a few posts on EEVBLOG. Then I left the PC and came back to a loading keysight page.Why is Keysight automatically loading in my browser? I hit F5 and you can see the history. Was this triggered by an EEVBLOG site script? Is there any other plausible explanation? I checked the web pages I visited for links to this page in case I clicked one and I did not see one.

author: metrologist
author_rank: Super Contributor
timestamp: February 15, 2019, 05:45:01 am
content: Sure, go ahead and point out the elephant in the room. Of course, I must have clicked that as I was clicking to wake up my PC.I like to click on pages, and you kind of have to now as Windows seems to move your focus elsewhere for no good reasons. Many sites have the whole page active and that sucks more.I could not view the keysight page because of a huge pop-up requiring me to surrender. There was no other choice, keysight just said be my bitch or get lost.

author: TheSteve
author_rank: Unknown
timestamp: February 15, 2019, 06:02:21 am
content: The question is, did you order any new toys by mistake as well?

author: metrologist
author_rank: Super Contributor
timestamp: February 15, 2019, 04:04:41 pm
content: I'm sure that can be made to happen. I might have bought something on purpose if I actually saw stuff for sale.
73 Magazine on the Internet Archive - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: February 12, 2019, 11:15:44 am
content: Discovered while searching for something else that the complete print run of '73 magazine' is on the Internet archive, I'm pretty certain that this has been the source of many an eBay kit.https://archive.org/details/73-magazine

author: bd139
author_rank: Super Contributor
timestamp: February 12, 2019, 12:33:12 pm
content: Good reference that and a good magazine.Some more here if anyone trips over this:http://mirror.thelifeofkenneth.com/lib/"ham radio magazine" is a trove of decent information.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 12, 2019, 12:50:04 pm
content: Thank you, I hope you don't mind I've added the links to the collection:https://www.eevblog.com/forum/projects/found-a-goldmine-looking-for-more-treasures-(hp-journal-and-alike)/msg2195445/#msg2195445In case you do mind, please let me know and I'll delete them from the collection.

author: Deodand2014
author_rank: Regular Contributor
timestamp: February 12, 2019, 01:46:07 pm
content: Quote from: RoGeorge on February 12, 2019, 12:50:04 pmNo problem at all. Here is an online index page for 73 Magazine which indicates that the publisher/editor declared the contents public domain in 2011.https://www.qsl.net/kb9mwr/files/ham/73.htmlAnd for anyone interested, here is a video I found showing someone building a Chinese eBay electronics kit based off a device whose plans were published in a 1995 issue of 73 Magazine.And the blog entry that identified the source of the design.https://m1kta-qrp.blogspot.com/2016/11/that-chinese-atu-more-info.html

author: German_EE
author_rank: Super Contributor
timestamp: February 12, 2019, 07:38:26 pm
content: Shameless plugAnyone who appreciates old magazines may find the following post to be of interesthttps://www.eevblog.com/forum/chat/own-a-piece-of-geek-history-%28competition%29/

author: JoeO
author_rank: Frequent Contributor
timestamp: February 13, 2019, 12:41:42 pm
content: I like this link better. It is easy to find specific issues or to download many issues.https://www.americanradiohistory.com/73_Magazine.htm

author: David Hess
author_rank: Super Contributor
timestamp: February 13, 2019, 11:31:59 pm
content: I can see myhouseme!
RIP Dr Peuto, Zilog and Sun's bright SPARC - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 14, 2019, 10:35:50 am
content: https://www.theregister.co.uk/2019/02/12/peuto_zilog_z8000_obituary/

author: Howardlong
author_rank: Super Contributor
timestamp: February 14, 2019, 11:43:55 am
content: The first mini I worked on in a paying job after university was a Z8000 based multi user system with RS232 terminals. I can't even remember what it was called, I think it was rebadged, possibly the OEM was NCR?? Before then I'd drooled over building my own Z8000 system, after building several Z80 (and other 8 bit) based machines, but it was a pipe dream.

author: hwj-d
author_rank: Frequent Contributor
timestamp: February 14, 2019, 12:50:02 pm
content: I remember my first µP weakly. That was aNascom-1(Z80) ...

author: georges80
author_rank: Frequent Contributor
timestamp: February 14, 2019, 10:15:49 pm
content: RIP indeed.Couple of years out of uni I was working on an Onyx Z8000 system that ran unix. Had something like a 20Meg hard drive (big for the time and I think 8" size...). Had magnetic tape cartridges for backup. This was around 1982/83.This in Perth at the time, backwaters of Oz civilizationcheers,george.
Unwinding air core inductors - Page 1
Forum section: electronics / general

author: adauphin
author_rank: Unknown
timestamp: February 10, 2019, 05:24:40 pm
content: I have a 20ga inductor I need to unwind, I will be using a DE-5000 LCR meter.The inductor is for a woofer circuit and will be from 150Hz to 2500 Hz.My question is, what frequency should I run through it to monitor the inductance while unwinding?Looking for the proper procedure to accurately accomplish this. I also have a function generator if that is more desirable to provide a signal.

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: February 10, 2019, 06:12:13 pm
content: Use the DE-500 frequency closest to the woofer's crossover frequency.Usually the lowest freq on the DE-5000. For me (different LCR meter) this would be 100 hz.Its very doubtful that a signal generator could help to give better readings than your DE-5000 (unless you have some other, better instruments you forgot to mention!)

author: adauphin
author_rank: Unknown
timestamp: February 10, 2019, 09:50:20 pm
content: Quote from: RandallMcRee on February 10, 2019, 06:12:13 pmNothing too crazy, Fluke 89 IV, 1054Z and the SDG-2042X function generator.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 11, 2019, 01:02:35 am
content: Mind that the wire you unwind still has inductance, especially if it is in a large loop rather than tightly paired up with the opposite lead. Figure maybe 1uH/m of free wire length, and adjust your measurement accordingly. Hopefully this will be an overestimate, so you can approach the desired value without undershooting it.Speakers are notoriously inconsistent on impedance, and their acoustic response is even worse. Accurate filters aren't particularly important. Measuring with an LCR meter probably isn't a big deal!Tim

author: adauphin
author_rank: Unknown
timestamp: February 13, 2019, 01:45:12 pm
content: Quote from: T3sl4co1l on February 11, 2019, 01:02:35 amThanks....good to know, I appreciate it.
OCXO for IoT applications - Page 1
Forum section: electronics / general

author: ejeffrey
author_rank: Super Contributor
timestamp: February 12, 2019, 04:06:21 am
content: My datasheet lol of the day:I was looking at phase noise specs for crystal oscillators and came across this datasheet:https://www.ecsxtal.com/store/pdf/ECOC-2522.pdfIt is a family of ~$100 tunable OCXOs ideal for cellular, radar, T&M and IoT applications.I guess for people who are annoyed when the clock on their microwave drifts a few seconds a year? Or for a combination internet connected doorbell/spectrum analyzer?

author: daqq
author_rank: Super Contributor
timestamp: February 12, 2019, 05:38:59 am
content: I always wanted a frequency counter that would have a twitter based UI.
Best way to load/present IoT device meta data in cloud server (AWS e.g.)? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: February 11, 2019, 08:50:03 am
content: Hi all,We're building a React web based tool for our IoT device, which presents log files from an AWS server.We'd like to present some basic meta data for each device, that the user can edit on the server (name, group, subgroup, description). The user should ideally be able to upload a text/json file with this info somewhere on the server - and the web tool should then load this information and present it in various places.For example, when a user clicks on a specific device in the menu, he should get a view where the meta data is presented at the top.We're trying to find a good way to do this efficiently without an extreme number of requests to the server.Any experiences/suggestions on how to handle this?Martin

author: onesixright
author_rank: Frequent Contributor
timestamp: February 11, 2019, 11:38:47 pm
content: You mean web based? Or is done on the IoT device?If WB you can just make a simple app. Django of Rails comes to mind.Sent from my X using Tapatalk
So... what would you do to use up 330uF/6.3V 85 degree C NICHICON electrolytics? - Page 1
Forum section: electronics / general

author: peteb2
author_rank: Regular Contributor
timestamp: February 11, 2019, 04:54:26 am
content: We now have almost 4000 of them.... (a wee oops order error). Apart from the odd coupling/decoupler project, SMPS repair, NE555 timing, it's case ofAny ideas....

author: Ian.M
author_rank: Super Contributor
timestamp: February 11, 2019, 05:00:56 am
content: Through hole or SMD? What's the qty per pack?It will be difficult to shift them for even ten cents on the dollar. If its still an option, it may be worth biting the bullet and accepting the supplier's no doubt extortionate restocking fee.OTOH if you know a competent EBAY seller of electronics parts you trust, it may be worth asking if they'll sell them for you on consignment.You may be able to get a tax writeoff if you can find any schools or colleges who'll accept them as a donation. Odds are you'll need to split the batch - I doubt many classes would get through more than 250 per course.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 11, 2019, 05:10:50 am
content: Is reselling them an option?

author: peteb2
author_rank: Regular Contributor
timestamp: February 11, 2019, 06:33:37 am
content: Good 'ole Through Hole! Restocking not an option, price in that quantity isn't going to break the budget either but deep inside me is a sense of waste. I know that personally i can never use that many of such a low volt device...Quote from: Ian.M on February 11, 2019, 05:00:56 am

author: amyk
author_rank: Super Contributor
timestamp: February 11, 2019, 12:25:00 pm
content: That voltage and capacity is common on GPUs. Try asking at badcaps.net if anyone wants them... someone may be willing to buy the whole lot from you.

author: mariush
author_rank: Super Contributor
timestamp: February 11, 2019, 12:57:38 pm
content: They're not gonna want 85c rated capacitors, as they're unlikely to be low esr enough for repairing stuff.Could be used in audio circuits, could be used with small linear power supplies (capacitive dropper supplies) I guess... can't think of anything else.

author: capt bullshot
author_rank: Super Contributor
timestamp: February 11, 2019, 12:59:17 pm
content: For next new years eve, build a sequencer popping a thousend caps in a row, one after each other

author: Ampera
author_rank: Super Contributor
timestamp: February 11, 2019, 03:45:30 pm
content: 4000 x 330 = 1.320 F, idk if that's enough to do some exploding of things, but when given a lot of capacitors my first thought always goes to build something that can pop something else.I mean imo keep it in a box somewhere and give it out when people want them, that's what I do when I have a shit ton of stuff I don't know what to do with. I don't imagine them to be taking up much space either, so
Voice Remote University Engineering Design Project  - Page 1
Forum section: electronics / general

author: Nick C
author_rank: Newbie
timestamp: February 10, 2019, 07:56:13 pm
content: Hello,For my 2nd year design project, I have been tasked with creating a voice controlled remote that can be used by disabled patients in a hospital to control their TVs. I have been recommended to use the Google AIY Voice kit along with a Raspberry Pi to accomplish this. What do you guys think?Thanks,NickUniversity of Ottawa Electrical Engineering Student

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 10, 2019, 08:10:05 pm
content: I recall the AIY Voice is linked to the cloud by default, but the following program allows it to be standalone:https://github.com/macbury/snips-aiy
Do we have electronic suppliers that would accept cryptos? - Page 1
Forum section: electronics / general

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: February 10, 2019, 04:10:37 pm
content: Hi,Dave would accept crypto as donation, but I want to know if you know some places that would sell parts, I personally prefer Chinese website, because they have cheaper prices.

author: Ampera
author_rank: Super Contributor
timestamp: February 10, 2019, 05:09:47 pm
content: I've found most places that accept crypto do it either as a marketing stunt (hey look at this shop accepting crypto sort of thing), or because using a real payment processor is expensive and/or not possible for legal or even political reasons.Issue is that trading in crypto is very hard on an actual scale, since a lot of cryptos are not stable currencies (neither are real currencies, but to a lesser degree). Not sure if you've taken an economics class before, or even a history class, but having bitcoin go from 500 to 1000 in the span of about a month isn't great for keeping an inventory of a lot of items with a lot of different prices.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: February 11, 2019, 07:52:55 am
content: QuoteI would accept some of your points, But I think the future which is not very far from us is crypto, because it would protect us against governments from stealing(getting taxes) from us, at least a part of our income can be hidden out there.Also Some giants made some moves toohttps://support.microsoft.com/en-us/help/13942/microsoft-account-how-to-use-bitcoin-to-add-money-to-your-account

author: BBBbbb
author_rank: Unknown
timestamp: February 11, 2019, 08:00:06 am
content: Quote from: ali_asadzadeh on February 11, 2019, 07:52:55 amCurrent state of cryptocurrencies disagrees with you...Anyways, with them being so volatile, anybody selling components would have to have a huge markup, thus deterring the classical purchasing...

author: ebastler
author_rank: Super Contributor
timestamp: February 11, 2019, 10:32:56 am
content: Quote from: ali_asadzadeh on February 11, 2019, 07:52:55 amYeah, sure. Crypto-currencies are the future, as a means for tax evasion, storing and moving slush funds... Be assured that, if they should become a mainstream tool for tax evasion, the authorities will make sure that this isnotthe future.In the meantime, feel free to have your crypto-currency stolen by someone else -- incapable or illicit Bitcoin exchanges, 51% attacks on smaller currencies, or whatever is next.
looking for stackable pins on digikey - Page 1
Forum section: electronics / general

author: mrcrud5
author_rank: Contributor
timestamp: February 08, 2019, 04:20:20 pm
content: I'm having a really hard time finding variations of these kind of stackable pins on digikey(see attached image). Can anyone give me some search tips on what specifically to search for when looking for these things?

author: ajb
author_rank: Super Contributor
timestamp: February 08, 2019, 04:39:41 pm
content: I've never had much luck finding those things at a distributor, but Samtec has those and just about every other variation on pin headers you can imagine, and they do direct sales--although I don't know what their pricing is like. They also do samples. It just takes some time to sift through the gazillion different options they have to find the right part number, but their part builder helps with that.https://www.samtec.com/connectors/standard-board-to-board#

author: nsrmagazin
author_rank: Regular Contributor
timestamp: February 08, 2019, 05:58:30 pm
content: Every site has its own search algorithms depending on the keywords. Sometimes you need to enter the exact model of the item in order to find it.Like this, keywords "header round needle connector" :http://www.cfcbazar.com/?s=header+round+needle+connectorand this keywords "header round":http://www.cfcbazar.com/?s=header+roundIn general what you are searcrhing for is "header pin connector". You need to tweak the keywords a little until you find what you need.

author: MarkF
author_rank: Super Contributor
timestamp: February 08, 2019, 08:09:11 pm
content: I have not been able to find them at Digikey and Mouser.I found them at Adafruit. A few examples of what they have:https://www.adafruit.com/product/85https://www.adafruit.com/product/706https://www.adafruit.com/product/1112

author: JXL
author_rank: Regular Contributor
timestamp: February 08, 2019, 09:24:00 pm
content: Search for PC/104 connector:https://www.digikey.com/products/en/connectors-interconnects/backplane-connectors-specialized/407?k=pc%2F104%20connector

author: nsrmagazin
author_rank: Regular Contributor
timestamp: February 09, 2019, 07:11:27 am
content: And if you don't want to look, ask at this website's email, they will find it for you.http://www.cfcbazar.com

author: ju1ce
author_rank: Regular Contributor
timestamp: February 09, 2019, 12:10:22 pm
content: Quote from: MarkF on February 08, 2019, 08:09:11 pmDigikey carries those:https://www.digikey.com/products/en/development-boards-kits-programmers/accessories/783?v=1528This has been my go-to source if I couldn't afford to wait for them to arrive from China.

author: daqq
author_rank: Super Contributor
timestamp: February 09, 2019, 10:16:25 pm
content: Farnell has this series:https://uk.farnell.com/w/c/connectors/board-to-board-connectors?product-range=esq-serieshttps://uk.farnell.com/samtec/esq-120-14-g-d/socket-2-54mm-2x20way-elevated/dp/1885912
Element14 trade account - Page 1
Forum section: electronics / general

author: arcticfish
author_rank: Newbie
timestamp: February 07, 2019, 03:32:11 pm
content: Hi guys,I have been purchasing small amount of items from element14. Recently, they offer me to open a trade account with them. But I am just a electronic hobbyist and just beginning this journey. My usual purchases are low values stuffs and sometime waiting for their big discount event. Would like to understand do I actually need it? What I can benefit from it?Thank you

author: jmelson
author_rank: Super Contributor
timestamp: February 07, 2019, 08:22:46 pm
content: The trade account MAY come with a discount. I think at one time my account did have some modest discount, I don't know if it still does. It DOES allow you to pay AFTER receiving the parts, at least in the US. I have open accounts with most of the major distributors, but I DO have a sole proprietorship business with business bank account and fictitious name registry with the state, and a federal tax ID number for the business.Jon

author: Halcyon
author_rank: Unknown
timestamp: February 08, 2019, 10:28:56 am
content: Element14 are more than happy to open up accounts for hobbyists. I have one myself which is used only a few times a year.Whilst it won't necessarily allow you to view discounted pricing, it does allow you to submit a parts list for quotation and you can nominate a "target price". I've been successful in getting pretty significant discounts on most products doing it this way.
AA batteries for wildlife camera (@ -10) - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: February 08, 2019, 07:16:15 pm
content: Hey All,The other day I placed a wildlife cam outside. Now it’s pretty cold (-10C) and I think it stopped working because of the low temperature. I’m using AA batteries (Amazon basics). Inside it works fine.Should I use a different type of batteries or is this a lost cause?Sent from my X using Tapatalk

author: tsman
author_rank: Frequent Contributor
timestamp: February 08, 2019, 07:24:35 pm
content: Use Lithium AAs. The internal resistance of Alkaline AAs sharply increases the colder they get. This means if your camera draws a lot of current then the AA cells might not be able to cope when they're cold. Lithium AAs aren't as affected and will retain most of their capacity at the same temperature.

author: onesixright
author_rank: Frequent Contributor
timestamp: February 08, 2019, 07:26:05 pm
content: Quote from: tsman on February 08, 2019, 07:24:35 pmAwesome. Thanks. Will try that!Sent from my X using Tapatalk

author: tsman
author_rank: Frequent Contributor
timestamp: February 08, 2019, 07:28:38 pm
content: Energizer has datasheets for Alkaline and Lithium AAs. The Lithium AAs are far better at low temperatures but also are far more expensive.http://data.energizer.com/pdfs/alkaline_appman.pdfandhttp://data.energizer.com/pdfs/lithiuml91l92_appman.pdf

author: mariush
author_rank: Super Contributor
timestamp: February 08, 2019, 08:06:21 pm
content: I would suggest either going with 18650 lithium batteries, or switching to C or D sized rechargeable NiMh batteries.A C sized battery has up to 5000mAh which is around 2-3 times more than 2 regular alkaline batteries.Rechargeable alkaline batteries are at around 2500-2800mAh max.A single 18650 battery has up to around 3500mAhRechargeable D size batteries are also a thing, but I'm not suggesting them since a lot of them are actually low capacity (~3000mAh), they're basically an AA battery inside the bigger case, and you may not find a cheap charger to charge them.So you could put two C batteries in a battery holder, put the battery holder in some insulated box and just the wires go to your camera and you're done. Chargers which take in 2 C size batteries are cheap, you can charge a set over the day while another set is in use in the camera ... and you just switch the sets of batteries.Here's an example of a charger with 4 C batteries for 32 uk pounds:https://www.amazon.co.uk/EBL-Universal-Discharger-Rechargable-Batteries/dp/B011TR1F10/You can buy the batteries separately, or the charger separately... at around 17 uk pounds for either one.
DataMatrix ECC 000-140 barcode decoding - Page 1
Forum section: electronics / general

author: krkoun
author_rank: Newbie
timestamp: February 07, 2019, 09:01:11 am
content: Hi,I have a problem with DataMatrix barcode decoding. It is definitely older type of DM - 15 x 15 (13 x 13), but as I dont know what is coded in it and it's device from work, i can't post it here.There is a lot of informations about new / actual version ECC 200, but almost nothing about older ECC 000 - 140.Do you have some experience with it, or have an access to ISO/IEC 16022 standard? I'am doing it just for fun, so I will not pay 198 CHF for it.The question is: Is it decoded the same way as ECC 200, L shaped pattern and somewhat different corner pattern?https://en.wikipedia.org/wiki/Data_MatrixThank you,Vojta
One about interesting voltmeters - Page 1
Forum section: electronics / general

author: Back2Volts
author_rank: Unknown
timestamp: February 08, 2019, 07:23:52 pm
content: I was looking for the pin wiring of a 4-digit module (BY-V436) I have on my hands and run into these two interesting hits:One bit voltmeter?https://www.amazon.com/0-36inch-Digit-Digital-Panel-Voltmeter/dp/B008REJSW2Check the wiring picture on this one:https://www.ebay.com/itm/4-Digit-0-36-Mini-Digital-Voltmeter-DC0-33V-Voltage-Meter-Panel-Electric-Tester/233094937917

author: tsman
author_rank: Frequent Contributor
timestamp: February 08, 2019, 07:36:53 pm
content: I want to see the motorcycle which has that "1-bit voltmeter" as a replacement part.The wrong photo is because of how Amazon has a ASIN for everything and somebody somewhere uploaded the wrong photo because they're just drop shipping and have no clue what they're actually selling. Amazon then decided that multiple ASINs were the same item and merged it to make that mess. Amazon UK has reviews for that item and they all say it works fine so presumably it didn't have the lamp photo at one point. It does say the volt meter has Product Dimensions: 50.8 x 25.4 x 48.3 cm ; 4.7 Kg and Boxed-product Weight: 4.7 Kg though...The wiring diagram has really bad Engrish on it. Public end = Common. No native speakers were consulted in the making of that diagram.
Tesla acquires Maxwell - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 05, 2019, 01:54:11 am
content: http://investors.maxwell.com/investors/news-and-events/press-releases/press-release-details/2019/Maxwell-Technologies-Announces-Definitive-Merger-Agreement-with-Tesla-Inc/default.aspx

author: ataradov
author_rank: Super Contributor
timestamp: February 05, 2019, 02:20:01 am
content: And reasonably cheap too.Maxwell stock went 50% up. Someone will happy. Ok it actually went up to the Tesla offer price. So they paid a nice premium.
History of the Telstra Research Laboratories  - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: February 03, 2019, 03:32:30 am
content: History of the Telstra Research Laboratorieshttp://www.coxhill.com/trlhistory/history/history.htmI came across that while finding this:http://www.coxhill.com/trlhistory/media/Telecommmunication%20Journal%20of%20Australia/The%20Telecommunication%20Journal%20of%20Australia%20Vol%2013.%20No%203%20FEBRUARY%201962.pdfThat issue of Telecommunications Journal of Australia was dedicated to construction of the Sydney to Melbourne coaxial cable link, officially opened on 9 April 1962.Has anyone some copies of that journal around that period, that they don't want? I'd like to get a good-condition paper copy of that particular issue especially.

author: vk6zgo
author_rank: Super Contributor
timestamp: February 03, 2019, 01:44:11 pm
content: Quote from: TerraHertz on February 03, 2019, 03:32:30 amI remember reading a lot of copies of "The Journal", whilst on shift a various Radio & TV sites.There was a follow up of that Sydney to Melbourne coax link, when a few years on, the coax between Perth & Geraldton went in.They used several Cat D9 dozers with ripper attachments on the rear to make the trench to lay the cable.After a while, they ran into major problems, as the rock was so hard the ripper blades were wearing out rapidly.The PMG sent out a "distress call" to Caterpillar in the USA, who promptly sent an Engineer out to join the crew & try to find out what the problem was.After some time, he took his findings back to the 'States, & Cat made up specially hardened ripper blades for this particular job.The Department got their problem sorted, Cat got a new addition to their product line, & the Engineer got an interesting trip, valuable experience, & substantial "kudos" with both his employer & customer.I could hardly imagine anything like that happening today---- the "bean counters"would go into meltdownat both organisations!

author: LapTop006
author_rank: Unknown
timestamp: February 04, 2019, 12:18:27 pm
content: Quote from: vk6zgo on February 03, 2019, 01:44:11 pmNah, that sort of thing does still happen. Much rarer than it used to be, and often unofficially, but it happens.
Miniature electrostatic lifter - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: February 06, 2019, 08:37:45 am
content: Very nice and cute:https://spectrum.ieee.org/automaton/robotics/drones/pennysized-ionocraft-flies-with-no-moving-partsIt'll be a bit of a problem to integrate all of the electronics (in particular the HV power supply and power source) onto such a small device though.
Chinese Tomzn products experience - Page 1
Forum section: electronics / general

author: HoracioDos
author_rank: Frequent Contributor
timestamp: February 03, 2019, 02:45:00 pm
content: HiDoes anybody have any experience with chinese Tomzn products? I couldn't find anything on internet. They don't have even a web site. I would like to buy a voltage protector like this. It's a lot cheaper than a local product.https://www.aliexpress.com/item/40A-220V-adjustable-automatic-reconnect-over-voltage-and-under-voltage-protection-device-relay-with-Voltmeter-voltage/32815184706.html?spm=a2g0s.13010208.99999999.260.1f913c00NY608lThanks in advance

author: tsman
author_rank: Frequent Contributor
timestamp: February 03, 2019, 03:00:14 pm
content: It probably works okay but it won't be certified to whatever your local electrical standards are and there will be no warranty. If there is any electrical fault and it is inspected then they'll just blame this unit because of that. Just get the local product IMO.

author: soldar
author_rank: Super Contributor
timestamp: February 03, 2019, 03:07:07 pm
content: http://www.tomzn.com/en/products.asp?act=yiji&tt=&id=555http://www.tomzn.com/en/about.asp

author: HoracioDos
author_rank: Frequent Contributor
timestamp: February 03, 2019, 06:45:48 pm
content: Quote from: soldar on February 03, 2019, 03:07:07 pmThanks.!I googled it so many times. I only found them in AliExpress or eBay.My Google fu must be weak this week.Thanks again
What is this device? - Page 1
Forum section: electronics / general

author: Zucca
author_rank: Unknown
timestamp: February 03, 2019, 09:50:20 pm
content: My friend was moving out her apartment, founded this:Do you know what is the purpose of this? I have no idea, she neither.Thanks...

author: tsman
author_rank: Frequent Contributor
timestamp: February 03, 2019, 09:54:09 pm
content: Most of the images don't load. 404 error from dropbox.

author: Zucca
author_rank: Unknown
timestamp: February 03, 2019, 10:01:54 pm
content: fixed..

author: Zucca
author_rank: Unknown
timestamp: February 03, 2019, 10:07:19 pm
content: Oh god there is even a bug under that transistor...Sorry, I did not noticed that before.That's a real bug here, hopefully not a show stopper one.

author: jeroen79
author_rank: Frequent Contributor
timestamp: February 03, 2019, 10:16:53 pm
content: My guess:A controller for fancy lights in for example a christmas decoration.With the 'pattern' button you could make the lights blink in various ways.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: February 03, 2019, 10:18:17 pm
content: It's a power supply for driving some EL segments on a shirt like:

author: tsman
author_rank: Frequent Contributor
timestamp: February 03, 2019, 10:25:36 pm
content: Quote from: ANTALIFE on February 03, 2019, 10:18:17 pmAhh. Nice work. I was thinking LED controller but why would you need a transformer to step up the voltage, why would you ever want to disconnect it from the LEDs and why are there so many wires. An EL panel shirt would need all of that.

author: amyk
author_rank: Super Contributor
timestamp: February 04, 2019, 12:04:34 am
content: I was going to say "a very bad PICkit clone"
Read out  a MACH210-12JC ? - Page 1
Forum section: electronics / general

author: AndyHH
author_rank: Newbie
timestamp: February 02, 2019, 05:49:17 pm
content: Hallo.I have a programmed Lattice Mach 210-12JC. Can I read this "Programmable Logic" with a programmer? Which programmer is suitable for this?Thanks in advance.
PU leather bag for electronics - anti static? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: February 02, 2019, 10:06:47 am
content: Hi all, we’re considering using a PU leather bag for shipping an electronics device (alu enclosure) to customers, for look and feel purposes.Do you know if PU leather be an issue in regards to ESD?Best,Martin
Walgreens Tests Digital Cooler Doors With Cameras to Target You With Ads - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: January 30, 2019, 01:52:56 pm
content: https://www.wsj.com/articles/walgreens-tests-digital-cooler-doors-with-cameras-to-target-you-with-ads-11547206200

author: Bud
author_rank: Super Contributor
timestamp: January 30, 2019, 02:31:19 pm
content: Unless the images of food items replicate the actual location of those items on the shelves inside the fridge i would be very annoyed.

author: rdl
author_rank: Super Contributor
timestamp: January 30, 2019, 05:53:35 pm
content: Oh, great. Now I'll have to go the long way around the store to pick up my prescription refills.

author: Stray Electron
author_rank: Super Contributor
timestamp: January 30, 2019, 07:02:05 pm
content: You already have to do that. Why else do you think that they have the one-way lanes going in and out of most stores? It's like going through a maze with only one way in and one way out so that they can make you walk by as many impulse-buy item displays as possible.Walmart gas stations (Murphy brand) tried something similar a few years ago. Every time that you went to one of their pumps, an add on box on the pump started BLARING an audio and video commercial for an expensive gasoline additive. I noticed that it didn't take long before people started smashing the video screens and buttons on them. None of the Murphy stations in my area still have them.

author: MrMobodies
author_rank: Super Contributor
timestamp: January 31, 2019, 11:20:55 am
content: I can see what they may do one day is put up "things" on the ceilings or use drones to track your movement in the store and beam rays of light in front you to pester you with adverts on the floor space and speak to you about buying things.

author: ConKbot
author_rank: Super Contributor
timestamp: January 31, 2019, 06:48:31 pm
content: Would that make a 1W blue laser an 'opt-out' option?

author: Cyberdragon
author_rank: Super Contributor
timestamp: February 02, 2019, 03:49:05 pm
content: Would you like to buy more packs of GUM?!Why YES!*chew-chew-chew SPLAT!*ERROR: VISION IMPARED!
Southern Manufacturing Show - Page 1
Forum section: electronics / general

author: g7gij
author_rank: Newbie
timestamp: February 04, 2019, 07:43:04 pm
content: any good Schwag obtained? Reports here pleaseAlthough you`ll have to fend off the reps for the next year.Top score is a slice of gréeasy Costco pizza at lunch time.CheersJames