hybridfree/eevblog-posts huggingface dataset:
How to solve EMC problems! || The mystery of the buzzing speaker - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: November 10, 2019, 05:58:46 pm
content: How to solve EMC problems! || The mystery of the buzzing speakerThought this might interest some, Great Scott on dodgy power supplies, and a quick visit to the EMC lab.Funny enough I have that exact same dodgy LED light with the same dodgy power supply, but never actually used it to do anything more than a brief test of the lights. Used another one instead.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 10, 2019, 08:42:23 pm
content: Nice. Simple, superficial, informative. I don't watch his channel regularly but from the few I've seen, the factuality seems a bit hit or miss. This one landed pretty well. (I wonder if maybe it was even reviewed by Wurth not just for marketing value but technical as well?).Also, TIL they make ferrite anal beads...https://katalog.we-online.com/pbs/datasheet/74275815.pdfTim

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 10, 2019, 08:45:53 pm
content: Oh, yes. It's somewhat informative, but clearly advertising for Würth?#EMC #shill
Hackers User Laser to Speak to Smart Speakers/Phones - Page 1
Forum section: electronics / general

author: edy
author_rank: Super Contributor
timestamp: November 05, 2019, 02:12:21 pm
content: I heard a quick blurb on the morning radio news on the drive in to work about this and thought surely the radio announcer got it wrong or "dumbed it down" to the point it didn't make any sense. It went something like this "You can use a laser pointed at your Smart Speaker and control it to open your garage, order pizza, etc)".Here's the WIRED article:https://www.wired.com/story/lasers-hack-amazon-echo-google-home/Apparently a high enough power laser source will at some specific frequency cause vibrations to be induced in the membrane of the microphone, creating an electrical signal. Laser-induction of a microphone. What are the physics involved? Is this just air being heated at the surface which expands and then creates a physical push? I can't see how light itself has enough energy to move the membrane. Even the Crookes radiometer works because one side of each vane is black and that side heats the air next to it, allowing it to be pushed. There isn't a perfect vacuum in those devices:And to defeat the "hack" one could simply cover the microphone with something like a sponge, a 90-degree angled pipe, some angled mirrors or anything that would obstruct a direct-path to the microphone as sound would easily be able to go around the corners or porous material yet inhibit any possibility of a laser hitting the microphone. Or just make the microphone membrane out of a lighter or silvery material, which would reduce air heating (like the back-side of a Crookes radiometer vane). As well, any software update could add something to see if could identify the "signature" of a laser-produced "sound" compared to actual voice. I'm sure after enough analysis it can be distinguished.MUCH TO DO ABOUT NOTHING!!!!??As always, the media and news radio sensationalize everything!

author: edy
author_rank: Super Contributor
timestamp: November 05, 2019, 02:18:30 pm
content: Here are the 4 videos from the researchers:

author: grifftech
author_rank: Frequent Contributor
timestamp: November 07, 2019, 04:21:49 pm
content: just don't put it near a window

author: RoGeorge
author_rank: Super Contributor
timestamp: November 07, 2019, 04:28:27 pm
content: https://www.eevblog.com/forum/security/researchers-find-microphones-are-susceptible-to-light-based-signal-injection/
List of LED Manufacturers - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: November 07, 2019, 12:07:01 am
content: Hi TeamI want to make a list of LED manufacturers, here is what I have so far:Advanced PhotonicAmerican BrightBivar IncBridgeluxBright LED ElecBrightek OptoBROADCOMCitizenCMLCREEDialightEdisonEKINGLUXEVERLIGHTEXCELITASFORYARDGoldiLEDHARVATEKHONGLITRONICHubei KENTOHUEY JANN ELECInoluxITSWELLKingbrightKOHALEDGUHONLEDTECHLIGITEKLITEONLUCKY LIGHTLumexLumiledsLUMINUSLUTOMarktechMARLNICHIANITRIDE SEMIOKAYAOptoSupplyOrientOSRAMPANASONICPARA LIGHTProLight OptoQT BrightekREFONDROHM SemiRoithner LaserSAMSUNGSANDERSanKenSeoul SemiSHARPShenzhen ZhihaoStanley ElectricSunLEDTOGIALEDTONYUTT ElectronicsTYL LEDUSHIOVCCVishayWAH WANGWENRUNWorldsemiWurth ElectronicsWuxi ARK TechYellow StoneWould you guys know of any worth adding?

author: tooki
author_rank: Super Contributor
timestamp: November 07, 2019, 01:07:51 am
content: I’d say Nichia is worth mentioning, given that they pretty much invented the modern LED.

author: DeanA
author_rank: Regular Contributor
timestamp: November 07, 2019, 05:01:05 am
content: LUTO lutotech.comYellow Stonewww.ystone.com.twLEDGUHONhttp://www.ledguhon.com/en/GoldiLEDhttp://www.goldiled.com/Edisonhttps://www.edison-opto.com.tw/en/LED Engin Oops Osram have bought them.
Silver plated copper enameled wire - Where? & How? - Page 1
Forum section: electronics / general

author: Free_WiFi
author_rank: Regular Contributor
timestamp: November 07, 2019, 01:25:27 am
content: Hello my dear friends...basically i'm here,because i have alredy killed a lot of my time to find somesilver plated copper enameled wireThe problem seems like this kind of wire does not exist,at least around the internet and Ebay ....At this point i'm here to ask you if it's yet possible to find this kind of wire for my RF projects.Thanks you very much.

author: vk6zgo
author_rank: Super Contributor
timestamp: November 07, 2019, 01:34:42 am
content: Quote from: Free_WiFi on November 07, 2019, 01:25:27 amI doubt very much if silver plating will make an astounding difference at RF ---modern copper is very pure.Silver plating does look pretty, though, & protects the copper from corrosion--- but so does enamel.I think that s where you will have trouble, as usually, you can get either, but not both.

author: Free_WiFi
author_rank: Regular Contributor
timestamp: November 07, 2019, 01:47:34 am
content: Yes i understood your point.BTW i really wish to have this kind of wire,because the physical reaction of plating the silver on the copper creates an inter-layer of Oxide-Dioxide which is the resposable to make the cable very,very good for any kind of high frequency.Since i can't manufacture coils of this kindhttps://superlab.stanford.edu/poster/3Dpassives_Rivas.pdffor obvious reasons i will go with some flat wire to try to solve the skin effect on my Toroid RF Coils.

author: Free_WiFi
author_rank: Regular Contributor
timestamp: November 07, 2019, 01:53:43 am
content: https://www.energytech.org/wp-content/uploads/ET2017Presentations/Track_6/RIVAS_EnergyTech_RIVAS_SuperLab_overview_Oct31_NASA-1.pdf

author: coppercone2
author_rank: Super Contributor
timestamp: November 07, 2019, 04:08:15 am
content: I want this product too

author: andy3055
author_rank: Super Contributor
timestamp: November 07, 2019, 04:37:25 am
content: https://www.google.com/search?q=enamelled+silver+plated+copper+wire&tbm=isch&source=univ&sa=X&ved=2ahUKEwiKj9v3otflAhXeJzQIHWJhAw4QsAR6BAgAEAE&biw=1366&bih=625
"The Current War" - film about Edison & Westinghouse - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 20, 2017, 11:32:52 pm
content: http://www.imdb.com/title/tt2140507/?ref_=ttloc_loc_ttOut early next year

author: Geerant101
author_rank: Contributor
timestamp: September 21, 2017, 02:07:09 am
content: Yes!Sent from my SM-G920I using Tapatalk

author: Shock
author_rank: Super Contributor
timestamp: November 03, 2019, 01:18:10 pm
content: Just watched The Current War tonight the "directors cut" version, it's a movie about Edison and Westinghouse in case you missed the meaning of the title, anyway quite well done. Different movie but similar style to The Prestige which is a good fictional movie from that same period.

author: German_EE
author_rank: Super Contributor
timestamp: November 04, 2019, 05:54:32 pm
content: Some background information about this movie.Originally it was scheduled to be released in movie theaters in 2017 with the Weinstein Company providing final editing and distribution, yes, THAT Harvey WeinsteinThe movie was eventually sold to Lantern Entertainment who then sold it on to 101 Studios who eventually released it in 2019.

author: Shock
author_rank: Super Contributor
timestamp: November 04, 2019, 09:03:35 pm
content: Yeah it's flown a bit under the radar but then again it would be fairly niche at first glance to most audiences anyway. I had no idea about it until a few days ago.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: November 05, 2019, 12:00:04 am
content: I saw it a week ago. It's an okay movie, but I suspect that the general public, who will never have heard of the current war, won't be able to make much sense of it.Tesla had a fairly minor role in the story, which is too bad--I would have liked to have seen more of him.

author: German_EE
author_rank: Super Contributor
timestamp: November 06, 2019, 07:32:27 pm
content: Try 'The Prestige' where David Bowie plays Tesla with a suitable air of mystery.

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: November 06, 2019, 08:02:01 pm
content: Just the other day I was tinning the ends of the wires of a string of 5 12V PVs, while I was tinning one end the other accidentally touched a metal door, made a connection to GND, and as I was pulling away the soldering iron from the wire I saw an incredibly long buzzing frightening arc and thought WTF is this !?!? It took me a while to figure out the bussiness with the other end. And that was only 60 or 70 maybe 80 at most open circuit volts no more. How many volts were there in Edison's DC sockets? DC had very real dangers!
Cute reed relays :) - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: November 04, 2019, 06:32:02 am
content: 4x4mm footprint, 15mm height. Pretty awesomehttps://www.pickeringrelay.com/pdfs/120-4mm-20W-reed-relays.pdf

author: wraper
author_rank: Unknown
timestamp: November 04, 2019, 06:55:16 am
content: Marketing though, 4mm2 TM. 4x4mm is not 4mm2. If it was (4mm)2 TMthen I could bear with it.

author: ebastler
author_rank: Super Contributor
timestamp: November 05, 2019, 01:54:44 pm
content: Quote from: wraper on November 04, 2019, 06:55:16 amThat marketing claim must refer to the PCB footprint then:Quote

author: cgroen
author_rank: Unknown
timestamp: November 05, 2019, 02:26:06 pm
content: Any idea about the price ?

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 05, 2019, 03:55:21 pm
content: Quote from: wraper on November 04, 2019, 06:55:16 amYeah. Then again, they may have some issues with the metric system.

author: H.O
author_rank: Frequent Contributor
timestamp: November 05, 2019, 04:32:04 pm
content: Quote from: cgroen on November 05, 2019, 02:26:06 pmI looked at Digikey and Mouser but they don't seem to stock it. Rapid is listed as one of their distributors and their website says £3.57 each in 100-quantities. Also found Testco who seems to sell them in single quantities at 7.23USD each.

author: cgroen
author_rank: Unknown
timestamp: November 05, 2019, 04:36:54 pm
content: Quote from: H.O on November 05, 2019, 04:32:04 pmThanks, I feared worse than that

author: Halcyon
author_rank: Unknown
timestamp: November 06, 2019, 05:22:29 am
content: Quote from: wraper on November 04, 2019, 06:55:16 amHow the hell can anyone trademark a measurement?I guess they are relying on the fact the it says 4-M-M not 4 millimeters squared?
Improving FM portable radio reception in a man cave - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: November 06, 2019, 12:24:03 am
content: I have a portable radio that I listen to inside a full metal shed. A real proper Faraday cage. I'm located out from the city so FM reception is fringe, but ok outside with just about any radio. Some times depending on weather the signal inside the shed is perfect. Most of the time, however, it is not.The radio has a telescopic antenna and though it is powered by the wall socket, it has a battery compartment which of course has a negative terminal.Have been stringing up various bits of wire in various configurations inside the shed and only getting mixed results. I think that I would like to put an antenna on the roof and would like some suggestions on how I might get a good result without making the chore too complicated.I've got miles of RG-6 coax.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 06, 2019, 12:40:12 am
content: Get a cheap TV amplifier (ideally with adjustable gain) and connect the input to an outdoor antenna and the output to a length of wire to couple it to the radio.
Military rugged laptop Teardown - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: November 05, 2019, 08:12:20 pm
content: Anyone remembers the Grid Compass?https://en.wikipedia.org/wiki/Grid_CompassFond memories...

author: soldar
author_rank: Super Contributor
timestamp: November 05, 2019, 08:36:21 pm
content: Quote from: SiliconWizard on November 05, 2019, 08:12:20 pmHa! I had one! I had to hit the keys so hard that my fingers hurt.
Ordering ICs from Chinese manufacturers - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 04, 2019, 12:36:59 am
content: Suppose I want to buy qties of 10 chips from Macro Silicon as a private individual?http://en.macrosilicon.com/default.aspThey don't even have datasheets for download, but they say they"provide convenient technical support service for customers".Hmm, I wonder who they consider "customers"? These chips are used by the barrel for all those dirt-cheap NTSC to HDMI converters out there. I just want to get my sweaty little handson some datasheets and some parts.I checked LCSC, Banggood, Aliexpress. They don't sell these chips.Any ideas? I already contacted MS support email but that doesn't bode well.

author: amyk
author_rank: Super Contributor
timestamp: November 04, 2019, 02:58:24 am
content: Buying the devices and harvesting the ICs from them might be easier, although lack of a datasheet may get in your way a little.

author: thm_w
author_rank: Super Contributor
timestamp: November 04, 2019, 08:52:52 pm
content: https://s.taobao.com/search?q=ms9282

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 05, 2019, 01:08:33 am
content: Quote from: thm_w on November 04, 2019, 08:52:52 pmd'oh!OK I'll look there, but that link you gave me takes me to a chinese login page. But point taken.
Dave Jones tutorial on base-emitter of NPN being used as zener diode - Page 1
Forum section: electronics / general

author: ocset
author_rank: Super Contributor
timestamp: November 04, 2019, 07:51:39 pm
content: HiDave Jones has a tutorial on the above.....ive searched but cant find it....i watched it about a year back.Does anyone know where it is?Dave takes apart some kit that uses an NPN base-emitter in reverse as a zener....i think it was for protection, and i think it was a DMM

author: Dr. Frank
author_rank: Super Contributor
timestamp: November 04, 2019, 08:11:49 pm
content: Easy, that's Fundamental EEVblog #1157 - Transistor Zener Clamp Circuit from Dec. 2018.That clamping circuit is used in a Fluke 8060A - successfully - to protect the symmetrical DCV input for no more than 5V.Dave then wants to adapt that to the 121GW Ohm protection, which does not work at all, because that use case is asymmetric and up to 15V or more.Frank
The Art of Gold Beating [1959] - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: November 15, 2019, 02:23:53 am
content: I know not EE related but still very interesting. Spot the number of workplace health and safety violations by today's standards:

author: MT
author_rank: Super Contributor
timestamp: November 15, 2019, 02:30:24 am
content: That hoppingbumpingjumping machine would not be allowed today!

author: coppercone2
author_rank: Super Contributor
timestamp: November 15, 2019, 02:59:42 am
content: hearing protection

author: Nusa
author_rank: Super Contributor
timestamp: November 15, 2019, 03:02:26 am
content: Depends on what countries standards you're using, of course.That didn't look too bad for 1959. People didn't think too much about hearing protection then.

author: TerraHertz
author_rank: Super Contributor
timestamp: November 15, 2019, 05:08:06 am
content: The production of gold leaf is highly comical. Who knew?

author: eti
author_rank: Super Contributor
timestamp: November 16, 2019, 04:42:40 am
content: Nothingcan beat a nice bit of gold.

author: TheHolyHorse
author_rank: Regular Contributor
timestamp: November 16, 2019, 08:02:32 pm
content: Imagine hammering gold leafs 8 hours a day. What a dream job

author: Miti
author_rank: Super Contributor
timestamp: November 17, 2019, 12:44:23 am
content: Quote from: coppercone2 on November 15, 2019, 02:59:42 amFingers protection...
Inventing Original Silicon Devices - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: November 03, 2019, 05:02:29 pm
content: prototyping, designing printed circuit boards from scratch is a known process, but what about the next step up?what if you have a brilliant idea for a new silicon device?who gets to say what is made in the silicon real estate development process.can anyone crowd fund a new silicon device? if no such silicon device does exist.can anyone that is not part of a corporate multinational re-design old silicon devices for a new market.

author: daqq
author_rank: Super Contributor
timestamp: November 03, 2019, 05:50:47 pm
content: QuoteYes, but...There are services that will make whatever silicon you design, but they are expensive:https://www.mosis.com/Also, to the best of my knowledge, the whole field is a giant patent minefield and the design software costs a pretty penny.

author: coppice
author_rank: Super Contributor
timestamp: November 03, 2019, 06:00:30 pm
content: It takes a lot of expertise to develop even the simplest silicon device. However, anyone with deep enough pockets can hire people with the necessary expertise, rent access to the necessary tools, and get a foundry and an assembly and test company to make the parts. It does take deep pockets, though.
Google to buy Fitbit in $2.1 billion deal - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: November 02, 2019, 12:35:37 am
content: https://www.cnn.com/2019/11/01/tech/fitbit-google-acquisition/index.html

author: Towger
author_rank: Super Contributor
timestamp: November 03, 2019, 07:15:01 am
content: Won't be long until they sell your data to your health/life insurance company.

author: Cubdriver
author_rank: Unknown
timestamp: November 03, 2019, 08:21:07 am
content: I'm now glad that my FitBit broke.-Pat

author: TomS_
author_rank: Frequent Contributor
timestamp: November 03, 2019, 01:58:30 pm
content: Quote from: Towger on November 03, 2019, 07:15:01 amGoogle doesnt sell peoples data. But yes they do collect a lot of it for use by their own services, e.g. to show more personalised ads.
What happened to the EEVblog Chinese mailbag special idea? - Page 1
Forum section: electronics / general

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: November 02, 2019, 10:26:22 am
content: On episode 1019, Dave Jones talks about wanting to do a Chinese special episode of the mailbag. He said that he had already shot the footage for it and was going to try to find it.Ever since there appears to have been no updates on the episode even though it would have probably made for a more comedic episode (as the episodes take a less serious tone when the eBay items are featured).Here is the video link with the timestamp where Dave talks about the episode idea:https://youtu.be/WyV06NfWzoQ?t=2556

author: EEVblog
author_rank: Unknown
timestamp: November 03, 2019, 08:08:14 am
content: IIRC I shot the unboxing parts of that video and then something else got in the way and the items put aside for the close up video but it never happened. And then a lab move happened, so no chance of finishing that.I might see if I have the footage and dump on the 2nd channel.

author: MatthewMorgan
author_rank: Regular Contributor
timestamp: November 03, 2019, 08:31:39 am
content: Quote from: EEVblog on November 03, 2019, 08:08:14 amThat would be really good as your initial reaction to seeing the eBay Chinese crap is normally better than the teardowns of them. The only exception to this would have been the £1 soldering iron I ordered (episode #866), which probably could be on a best moments of the mailbag.Thank You
What to do with (or scavenge from) old 2G mobile phones - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: November 02, 2019, 08:04:44 am
content: In many parts of the world 2G networks are already closed. Still bumping into former famous 2G phones, like the indestructible Nokia 3310, or some other brands or models from before the smart phones era. It feels like a waste to just throw them away in the recycling bins for electronics.There are a lot of RF goodies to scavenge, and other non RF parts, too. Schematics are now easy to find, so anything from single components to entire RF blocks could be reused, or maybe the whole phone if alternative firmwares would exist. Even the batteries are still good enough for DIY projects.Any interesting links or projects reusing old phones, please?Any tips for what models have what particularly interesting parts inside?

author: CJay
author_rank: Super Contributor
timestamp: November 02, 2019, 11:21:31 am
content: Old AMPS phones were a valuable source of parts, the carphone modules were full of useful bits, the later 2G phones were less easy to salvage useable parts form as they were more integrated and far smaller but it's possible to recover useful RF bits like VCO and PA modules from some, batteries, microphones, screens are also useful, the venerable Nokia displays have been widely hacked and documented for instance.Some use digital microphones which are fun to play with too, I seem to remember some of the phones have been hacked so deeply that it's possible to write your own firmware but how useful that is is another matter entirely.

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 02, 2019, 12:43:00 pm
content: If they also work on the ISM band (e.g. 900MHz where commercial cellular is 850MHz and vice versa), they could potentially be used with a DIY base station on the ISM band. Sounds like a lot of effort to get a fancy cordless phone system...
Excessive spectral content (spooky) - Page 1
Forum section: electronics / general

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 01, 2019, 07:54:39 am
content: https://www.reddit.com/r/electronics/comments/dptthf/the_rf_teams_having_some_fun_not_a_scope_in_xy/Tim

author: maginnovision
author_rank: Super Contributor
timestamp: November 01, 2019, 08:11:33 am
content: Saw this on their YouTube page, looks great. He is supposed to release the exact method too... If they tell him.

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: November 01, 2019, 08:23:54 am
content: Aphex Twin did it 20 years ago usingMetaSynth, so there should be open source implementations by now.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 01, 2019, 08:29:02 am
content: Yup! Pops up from time to time, a more recent case being the Doom (2016) sound track.Tim
3D Print Electronics On-Demand - Page 1
Forum section: electronics / general

author: IanB
author_rank: Super Contributor
timestamp: October 31, 2019, 03:31:53 am
content: So like, er....?https://www.kickstarter.com/projects/eforge/eforge-3d-print-electronics-on-demand

author: Whales
author_rank: Super Contributor
timestamp: October 31, 2019, 04:25:55 am
content: https://www.eevblog.com/forum/suggestions/eforge-scam/
Anyone going to the Shenzhen Maker Faire, November 9/10? - Page 1
Forum section: electronics / general

author: taitny
author_rank: Newbie
timestamp: September 24, 2019, 01:03:21 am
content: I'll be in Shenzhen a few days early, to explore SEG and HQB, and then head back to NY the Monday after.If you are planning on going, we should talk about a meetup.If you want to go but are afraid to plunge into china alone, I may be able to talk you through it. All you really need is a US carrier smart phone and a good international Data plan. Google translate can be your guide, and there are other tools, including wechat, and bing.First step is to get a Visa, and time is running short, apologies for not posting this earlier.Air Fare from New York JFK to SZX is around $600 (round trip). I'll be staying in an AirBNB (Yes they have those in China).I would recommend avoid flying into Hong Kong this time..I'm a retired GE Researcher, and now in private practice consulting in the area of optical metrology (think automated industrial inspection). Being my own boss, gives me the flexibility to travel.Thoughts?

author: beanflying
author_rank: Super Contributor
timestamp: September 24, 2019, 02:52:29 am
content: If anyone is interested in heading that way a look through this video playlist might be of interesthttps://www.youtube.com/playlist?list=PLIizEY7AraGyh6Y7KdNGXxRuXXwz9m8taWell worth a look just for general background on some of how some of Shenzhen works re electronics.Video #2 on the list includes footage of the 2017 Maker Faire in Shenzhen.

author: Black Phoenix
author_rank: Super Contributor
timestamp: September 24, 2019, 07:02:35 am
content: I may go, since why not? Probably less than an hour trip by bus!

author: HighVoltage
author_rank: Super Contributor
timestamp: October 01, 2019, 09:13:15 am
content: Bookmarked!I am going to Shenzhen by the end of this month, may be I will stay a little longer for this event.

author: Black Phoenix
author_rank: Super Contributor
timestamp: October 01, 2019, 09:13:32 am
content: Well from my part is already decided that I will go, plus being free entrance I don't lose anything.If I have the chance to meet some people from this forum, it's even a better. Plus having the chance to learn something is always a good thing too.I may be up also for exploring the electronic markets with people who knows what they are looking for.

author: Black Phoenix
author_rank: Super Contributor
timestamp: November 03, 2019, 03:28:41 pm
content: So from this forum who is going? I will be there on the 10th.
Crappy USB power adapters/chargers - Page 1
Forum section: electronics / general

author: hamster_nz
author_rank: Super Contributor
timestamp: October 30, 2019, 10:37:10 pm
content: I had the displeasure of looking at a the 5V rail of USB power adapters, while trying to track down the source of noise in a project I'm building. The only one that was anything like a good supply for evaluating audio projects was the one that came with my ChromeCast Audio.I must say, the level of noise and switching artifacts varied really wildly. What surprised me most was a "Power Bank" that jumped up and down 0.1V for 20ms at a time... maybe it was probing to see if it needed some high current mode.

author: thm_w
author_rank: Super Contributor
timestamp: October 30, 2019, 11:01:36 pm
content: The power bank is probably probing for a load yeah, so it can shut down the output if nothing is connected. That or its attempting cable compensation. It doesn't seem like pulse skipping.Anyway, USB adapters are focused on efficiency and quiescent current, not noise. I would probaby never use the output directly in any serious project. You could always drop the rail to 4 or 4.5V with LDO, etc.

author: hamster_nz
author_rank: Super Contributor
timestamp: October 30, 2019, 11:46:20 pm
content: I was looking at Pk-Pk +/-10mV after a lm1117-3.3V LDO, with lots of high frwquencies in it, that was leaking into the ADC.Sigh... But it is all learning experiences

author: thm_w
author_rank: Super Contributor
timestamp: October 31, 2019, 12:07:34 am
content: Quote from: hamster_nz on October 30, 2019, 11:46:20 pmThats surprising to see 10mV. The 1117 looks like it tapers off at about 20kHz or so, then noise will get through. Could try some ferrites for the HF, one on input one output.Maybe daves capacitance multiplier is worth playing with as well:https://www.eevblog.com/forum/blog/eevblog-1116-the-capacitance-multiplier/I haven't tried, would be cool to measure its frequency response compared to the LDO.
How old are these Fairchild TTL chips - Page 1
Forum section: electronics / general

author: johnh
author_rank: Regular Contributor
timestamp: October 29, 2019, 08:52:28 pm
content: Cleaning out some of the crap I have hoarded and found these.As the subject line says how old are these?

author: MagicSmoker
author_rank: Super Contributor
timestamp: October 29, 2019, 09:19:26 pm
content: I was easily stumped by the lack of an obvious date code in the traditionalWWYYYYWW* format, but judging by the appearance I'd say pre-1977.Furthermore, I've never seen a 6-digit 74 code. What are they supposed to be?EDIT - well, apparently the old TTL numbering system does include members with 4 digits after the 74, but most seem to be variations on the lower number members.* - I'm not dyslexic, not that you couldn't tell from inverting the date code format.

author: Syntax Error
author_rank: Frequent Contributor
timestamp: October 29, 2019, 09:30:12 pm
content: If I remember correctly, Fairchild had a habbit of dropping the decade from the date code, so they used YWW not YYWW. So these puppies would likely be from early 1971. What they are, not a clue!?

author: bsudbrink
author_rank: Frequent Contributor
timestamp: October 29, 2019, 10:27:10 pm
content: Quote from: Syntax Error on October 29, 2019, 09:30:12 pmI agree with 1971. Third and twenty-second weeks. I believe that they are three 7404 and one 7410 TTL logic devices. The '59' postfix is the fabrication facility code (sort of like the production line).

author: duak
author_rank: Super Contributor
timestamp: October 30, 2019, 05:03:50 am
content: If memory serves, Fairchild changed their package logo sometime in the early 80's. I looked at some of my old Fairchild chips and see that the newest block 'F' is from 1981 and oldest 'f' is from 1983. I don't know what logo they used on the packages in the 60's but their corporate logo above the "Traitorous Eight" picture is a slanted 'f'.It's interesting is that the printing on the parts in question is rotated. DIPs almost always have pin 1 in the lower left when the text is upright.

author: amyk
author_rank: Super Contributor
timestamp: October 31, 2019, 02:44:29 am
content: The unusual "U6A"-prefixed parts can be found inthis 1974document and confirms that they are 7404s and a 7410.Also of interest, a 1969 Fairchild databook:https://archive.org/details/bitsavers_fairchilddldch15_20989397...from which we find the useful phrases "Specify U3I90165XX for flat package and U6A90165XX for Dual-In-Line package, where 5XX is 51X for -55C to +125C temperature range or 59X for the 0C to +75C temperature range", and "To order Transistor-Transistor Micrologic elements specify U31XXXX-51X for Flat package and U6AXXXX51X for Dual In-Line package where XXXX is the four-digit number denoting the specific element desired."
Aussie Invader Land Speed Record Attempt, not politics or world affairs  - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: October 30, 2019, 12:26:07 am
content: A video from this channel came up as a YT recommendation over the weekend. I wonder how far away they are located from Dave and what it would take to have him conduct an interview. I imagine to it takes a fair amount of electronics and some good control systems to operate a 200,000 HP engine. Looking forward to seeing how it plays out.http://aussieinvader.com/https://www.youtube.com/channel/UCFEIcie1XhzDSTfWndlFssg

author: Brumby
author_rank: Unknown
timestamp: October 30, 2019, 01:32:49 pm
content: Dave's in Sydney and Rosco is in Perth - which is the opposite side of the country. The drive would be about the same as San Francisco to Cleveland.

author: DTJ
author_rank: Super Contributor
timestamp: October 30, 2019, 01:54:34 pm
content: Rosco is getting long in the tooth. It's been a very long term project. He was right into it in the 80's.

author: maginnovision
author_rank: Super Contributor
timestamp: October 30, 2019, 06:06:02 pm
content: Land speed stuff is cool but I'm not really that interested in rockets. I'd definitely spend time watching any attempts they managed though.
Pt1000 input temperature controller needed. - Page 1
Forum section: electronics / general

author: alpher
author_rank: Frequent Contributor
timestamp: October 28, 2019, 04:22:58 pm
content: Looking for temperature controller capable ofPt1000input.Have a device with Pt1000 probes allready in and rather dificult to replace, been looking for suitable temperature controller (could be 1/16 to 1/4 DIN, doesn't really matter), and having a hard time finding one.It's really time consumig as most don't advertise the Pt types supported, all of them do Pt100 of course.I really don't want to replace the existing probes.Maybe someone knows one that will work for me, I've looked through most of the Omegas, Omrons, Solo's and nada.I can find temp. displays that accept Pt1000 but no controllers?

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 29, 2019, 01:10:09 am
content: http://www.jumousa.com/products/control/electronic/1-channel-controller/703041/jumo-dtron-304-308-316-%E2%80%93-compact-controller-with-program-function-703041-42-43-44.html

author: langwadt
author_rank: Super Contributor
timestamp: October 29, 2019, 01:30:20 am
content: if you have a controller that can take 4-20mA, maybe add a PT1000 to 4-20mA transmitter?

author: alpher
author_rank: Frequent Contributor
timestamp: October 29, 2019, 03:57:02 pm
content: Quote from: SiliconWizard on October 29, 2019, 01:10:09 amThanks man, actually I ordered this :http://www.jumo.ca/products/temperature/controllers-electronic/1-channel-controller/702030/jumo-quantrol---compact-controller-702030.html?parentId=2919from their canadian division, muuuch cheaper.Thanks again.
Analog devices website has a broken signup process... - Page 1
Forum section: electronics / general

author: julianhigginson
author_rank: Frequent Contributor
timestamp: October 30, 2019, 07:38:02 am
content: has anyone tried signing up for a new account with AD recently?I wanted to go on their forum to ask a question about a terribly documented part of theirs that's just not behaving anything like the datasheet seems to possibly be recommending, and when I got to create an account there are a few steps...first up is you click through the marketing guff where you are meant to select things to be spammed about later (no thanks!)then you type in your email address.then it sends you an email address verification code. (from microsoft!)then you go copy the number from that back into the website.then your email is "verified"Then you go to progress the account creation, but then "email address is already registered" suddenly pops up... and there's nothing else you can do.from then on, restarting the signup process fails as soon as you put your email address in.talk about a pain in the rear.has anyone else experienced this? I just had the exact same problem with my work email and my old personal email.
Azure: Install custom depreciated TLS certificate on storage server - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: October 29, 2019, 11:43:06 am
content: Hi all,We have a number of IoT devices deployed in the field, sending data to an Azure storage endpoint.The devices upload data via HTTPS using the Azure root endpoint certificate, which worked up until recently.About a week ago, all devices failed to connect - and the reason was a change in the Azure root endpoint from Digicert Global Root CA to Baltimore Cybertrust Root.Updating a device with the new certificate makes it able to connect again - but we have many devices in the field that we would manually need to update, which would take weeks. The devices are limited in regards to the number of certificates and we only installed the root certificate, not knowing that this was subject to change within a short period - we are of course now wiser.Our question: Do you know if it's possible to install the "old" certificate as a custom TLS certificate on our Azure server, while keeping the access key, secretkey, endpoint etc. constant? This would potentially allow the IoT devices in the field to re-connect, after which we could perform remote updates.Your inputs are appreciated,Martin

author: amyk
author_rank: Super Contributor
timestamp: October 29, 2019, 12:25:52 pm
content: Unless it's a VM that you have in Azure, Microsoft controls those servers, not you...
The dark side of gold - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: October 27, 2019, 12:15:34 pm
content: What would we do without gold, and all those pretty color, reliable gold-plated connector pins? Upon which our technology depends even more than it does on money.Well here's an article on how the gold in our interstellar neighborhood was formed. Previously I'd thought gold was formed along with other heavy elements in garden-variety novas and supernovas. But no...https://www.space.com/neutron-star-crash-made-gold-uranium.htmlAncient Neutron-Star Crash Made Enough Gold and Uranium to Fill Earth's OceansThese guys say they have identified the ONE event that made almost all our gold. Also when, and it wasn't nice.Assuming that the universe actually does have fairly common life-bearing planets, then that one gamma ray burst probably obliterated hundreds or thousands of living planets.Gold. It's costly stuff.On a lighter note, here's another article attempting to report on the same thing. Except the writer is seriously struggling with the astrophyical concepts. Did you know stars have 'length'? That title...https://www.naturalnews.com/2019-10-26-gold-heavy-elements-formation-neutron-stars-collision.htmlGold and elements heavier than iron were formed on Earth after neutron stars collided billions of years ago: StudyOh well, she tried.PS. Now I hate gold scrappers even more.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: October 27, 2019, 08:48:44 pm
content: Can't get much darker than this:https://youtu.be/GZ7IT0O9-7I

author: GlennSprigg
author_rank: Super Contributor
timestamp: October 28, 2019, 11:13:44 am
content: TerraHertz....I for one, always have a 'devil' of a time when trying to convince 'laypersons', as well as thereasonably educated, that the vast majority of 'Elements' have originated from old star systems.Some people think it 'belittles' us, but I think it is absolutely fantastic that a large part of our ownhuman bodies consists of such remnants of prior Super-Novas etc....I guess what I'm daring 'not' to say... is our 'Universe' holds greater secrets/facts than any Deity...

author: SilverSolder
author_rank: Super Contributor
timestamp: October 28, 2019, 03:21:33 pm
content: [...]We are stardust.We are golden.And we've got to get ourselves back to the garden.[...]--Joni Mitchell, 1970

author: SeanB
author_rank: Super Contributor
timestamp: October 28, 2019, 04:51:12 pm
content: Well, considering 99.9% of the known visible matter in the universe is hydrogen, with a trace of Helium, and a trifling trace of "everything else", we are all basically the result of dead stars from the past.

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 28, 2019, 05:10:10 pm
content: How is that news?

author: daqq
author_rank: Super Contributor
timestamp: October 28, 2019, 08:53:50 pm
content: To be fair, the 'garden variety supernova' puts out a lot of nasty as well. Probably not as bad, but still.
Current BMW Commercial Test Equipment Prop - Page 1
Forum section: electronics / general

author: xrunner
author_rank: Super Contributor
timestamp: October 24, 2019, 11:08:26 pm
content: One of the current BMW commercials (song by AC/DC) uses some sort of test equipment prop. Is it real gear or a prop?https://www.ispot.tv/ad/o4sg/bmw-are-we-there-yet-song-by-ac-dc-t2Screen capture -

author: Black Phoenix
author_rank: Super Contributor
timestamp: October 24, 2019, 11:22:21 pm
content: It may be a prop, the real one doesn't had that screen:You can see the battery meter on the dash in the right:More about it:https://www.topgear.com/car-news/first-look/meet-all-electric-bmw%E2%80%A6-1972That doesn't mean that it didn't existed an equipment like that to test the car the first times, who also doesn't mean that the text equipment is real and not a prop, but on the original car it isn't present.

author: Zucca
author_rank: Unknown
timestamp: October 25, 2019, 06:32:34 am
content: I am working for BMW since 2006. Here in the Germany headquarter I sadly never saw a commerical with AC/DC in background.This one is not a fake:But not everybody liked it:https://www.eevblog.com/forum/buysellwanted/fs-eu-400-keithley-2000-bench-dmm-6-5-digit-zucca-bundle-alarm/msg2159698/#msg2159698This one is also nice:https://www.youtube.com/embed/9rx7-ec0p0A

author: Black Phoenix
author_rank: Super Contributor
timestamp: October 25, 2019, 11:44:57 am
content: Quote from: zucca on October 25, 2019, 06:32:34 amThis one is very good. Specially because is a recognition of a competitor, not like most of the ads that I see mocking the competition.

author: thinkfat
author_rank: Unknown
timestamp: October 25, 2019, 12:12:10 pm
content: Quote from: xrunner on October 24, 2019, 11:08:26 pmIt's probably a real piece of test equipment, an old voltmeter of some sorts. I guess they fitted it in for the commercial, otherwise there'd be no clue to this being an all-electric car.EDIT: could be some Heathkit meter, actually.

author: TimFox
author_rank: Super Contributor
timestamp: October 25, 2019, 01:17:14 pm
content: That piece of equipment looks like a highly-modified Heathkit meter. The brown knobs and cabinets are from that era. The metal-skirted knob and binding posts on the right look like ca. 1960 Hewlett-Packard hardware.
Suggestion for outdoor PIR and (CCTV) Camera (ceiling mount), which IP rating? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: October 26, 2019, 09:04:51 am
content: Hi All,I'm looking at 360 degree PIR sensor, that should be installed in the "roof overhang". The need to be installed as said in the overhang, now that itself is waterproof, but since its outside you can have of course high humidity.1. PIR sensors are easily found, but what would be the IP rating I need (only concerned about moist)? IP44?2. I have a camera, but the motion detection sucks since it just image based (falling leaves, moving branches, etc. triggers is). Therefor I'm looking for a camera I could also ceiling mount but hasexternal IOtrigger, so I can connect the PIR.Also, don't want this to be all that noticeable, so looking for some low-profile /recessed versions (something like the attached pictures). I was of course googling this stuff, but damn thats gets quickly overwhelming!Any suggestions for a camera?Thanks!
Tek 2465 scope stars in music video - Page 1
Forum section: electronics / general

author: blatboy
author_rank: Unknown
timestamp: October 28, 2019, 03:36:14 am
content: I'm a full time musician and a struggling engineer.I have a record coming out 11/15/2019. Mellow/minimalist instrumental Trombone/guitar/vintage electronics.This song is only trombone and guitar, but you see some vintage electronics at least.The 2465 is my bench scope in the basement (where it was filmed, complete with junk on top)We filmed some footage too at the neon studio above my music studio here in Queens. You should have heard that Jacob's ladder. yeah man.Hope you likeif you want to pre-order the record or whatever (the singles that have been released are already on Spotify, Apple Music and all that crap) the links are on the YouTube page. I'll spare you my overt spamming here.

author: BravoV
author_rank: Super Contributor
timestamp: October 28, 2019, 03:52:41 am
content: You should try & see this if this fits your need, especially you got a good analog scope for visualization ->https://oscilloscopemusic.com/oscistudio.phpExamples, just ignore the music:https://youtu.be/TaGwJ5VJtYohttps://youtu.be/19jv0HM92kw

author: blatboy
author_rank: Unknown
timestamp: October 28, 2019, 04:01:16 am
content: oooooooooh. that's pretty cool.

author: BravoV
author_rank: Super Contributor
timestamp: October 28, 2019, 04:08:58 am
content: Ok, I think this one is more suitable for introduction for scope music ...https://youtu.be/XziuEdpVUe0
Best way to store/reference private encryption keys? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: October 23, 2019, 07:08:41 am
content: Hi all,We manufacture a data logger that records data from onto an SD card.As part of this, we've been working on enabling encryption of the data directly on the SD card.This is done using public/private key pairs.To decode the data the private key will be required as input for the software/script.However, we're unsure how to best guide our users on storing and parsing the private key for such purposes.The decoding may be done via executables/CLI tools on a PC, or as part of scripts running on a server storing the data.We'd appreciate any suggestions/thoughts in regards to how the private key would typically be stored.- incl. if you have suggestions/examples for the specific file format/structure.Thanks,Martin

author: ebclr
author_rank: Super Contributor
timestamp: October 23, 2019, 12:14:32 pm
content: Option 1https://www.yubico.com/services-with-yubikey/fido-u2f/Option 2https://en.wikipedia.org/wiki/Smart_cardOption3Send the asc certificate, to be installed on datalogger downloader

author: Jeroen3
author_rank: Super Contributor
timestamp: October 23, 2019, 01:50:57 pm
content: 1. Private keys are encypted with a password and stored somewhere.2. They are handed over the operating system certificate vault.https://docs.microsoft.com/en-us/windows/win32/seccng/key-storage-and-retrievalSide effects:1. The user will forget the password.2. The key will be forgotten on system migration.

author: 0culus
author_rank: Super Contributor
timestamp: October 23, 2019, 02:16:27 pm
content: Quote from: Martin F on October 23, 2019, 07:08:41 amJust some minor terminology quibbling: a symmetric key is not the same thing as a public/private key pair. The former implies using the same key for encryption and decryption. Do you mean that you are using public key crypto to encrypt the AES key you're using on the data?

author: tv84
author_rank: Super Contributor
timestamp: October 25, 2019, 12:03:36 pm
content: Quibbling 2:To decode the data, one doesn't need both priv/pub keys.The op never stated that he uses a AES key.Answer:My suggestion would be Jeroen3's 1st option.
TV show contracting - Page 1
Forum section: electronics / general

author: robotix3
author_rank: Regular Contributor
timestamp: October 24, 2019, 01:10:36 pm
content: Hey all,I've been talking to a producer about making some stuff for a new show, this world is totally new to me and it would be great to be able to talk to someone to learn about the industry, how much to charge, how much lawyering I should do, etc.Has anyone here done something like this or can point me to a good resource or forum?Thanks

author: langwadt
author_rank: Super Contributor
timestamp: October 24, 2019, 01:32:29 pm
content: https://youtu.be/zxKtH5OnxI4

author: SL4P
author_rank: Super Contributor
timestamp: October 24, 2019, 08:32:56 pm
content: seems like the best places would ne production companies or fil/tv schools in your location.