hybridfree/eevblog-posts huggingface dataset:
13 Minutes to the Moon - Page 1
Forum section: electronics / general

author: stevelup
author_rank: Regular Contributor
timestamp: June 22, 2019, 08:45:39 am
content: Thought I'd draw people's attention to a brilliant BBC podcast called 13 Minutes to the Moon.How the first moon landing was saved. The full story of the people who made Apollo 11 happen and prevented it from going badly wrong.It really is excellent.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 16, 2019, 04:23:53 pm
content: A few more people that worked for this to happen...https://e2e.ti.com/blogs_/b/thinkinnovate/archive/2019/07/15/celebrating-50-years-one-giant-leap-for-ti_1920_s-integrated-circuits

author: stevelup
author_rank: Regular Contributor
timestamp: July 17, 2019, 06:00:45 am
content: It’s almost impossible to imagine the scale of this project and how many people were involved when you consider subcontractors and their supply chain too. Truly breathtaking.The disappointing thing is when you imagine where we might be now if that level of effort was maintained. It feels like we’ve achieved very little in real terms over the past 50 years.

author: Towger
author_rank: Super Contributor
timestamp: July 17, 2019, 06:12:15 am
content: It actually feels like we have gone backwards. NASA are now taking about a man a woman on the Moon by 2024, but they currently can't even get a man into space.

author: hamster_nz
author_rank: Super Contributor
timestamp: July 17, 2019, 06:22:29 am
content: I've been following along in real time onhttps://apolloinrealtime.orgIt is very interesting to hear all the little problems that pop up and get solved.

author: schmitt trigger
author_rank: Super Contributor
timestamp: July 17, 2019, 06:29:02 am
content: As someone who grew up during the space race period, I can tell this greatly influenced me as a kid to pursue a career in engineering.Is there anything nowadays to inspire the new generations?
Glasses for the colorblind - an elegant solution! - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: July 14, 2019, 07:31:46 pm
content: As I understand it, it's essentially an optical band stop filter, that removes the overlap where the perception of some colors merges in the colorblind vision:https://enchroma.com/blogs/beyond-color/how-enchroma-glasses-workThe theory behind it seems legit and there are quite a few beautiful videos of colorblind people using them.

author: chris_leyson
author_rank: Super Contributor
timestamp: July 14, 2019, 09:02:09 pm
content: Thanks daqq, that made for an interesting read, I can see how a narrow band stop filter would improve red green resolution, for lack of a better word. Also, I had no idea dogs see in yellow and blue. Although I'm lucky to have nornal colour vision I still struggle once in a while with a badly marked resistor and have to metally go through the E24 series, next time I come across one I will have to take a picture.

author: 25 CPS
author_rank: Frequent Contributor
timestamp: July 14, 2019, 09:08:55 pm
content: In some colourblind visions. It doesn’t work for everybody and it only notches out parts of the spectrum where overlapping lis likely to be a problem. One very serious limitation with those glasses is that they can’t put back a colour that’s missing outright so for someone with protanopia type colourblindness, for example, those glasses can’t put back the missing red content.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 14, 2019, 10:05:47 pm
content: An AR headset can remap a color to another color. In fact, that concept isn't even limited to the visible spectrum - for example it could make normally invisible wavelengths like IR and UV visible by translating them into visible colors. Widening the potential market to more than just the 5% or so who are color blind really helps to justify developing the technology.

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 14, 2019, 10:26:06 pm
content: Quote from: daqq on July 14, 2019, 07:31:46 pmTried'em... returned them.Lots of more reasonable priced options too.https://www.amazon.com/s?k=color+blind+glasses
Digitization of 1980s Discontinued Electronics Notebook  - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: July 13, 2019, 09:46:30 pm
content: the digitization of 1980s discontinued Tandy / Radio Shack electronics notebookaudio on the video is a mix of youtube voices cut and pasted as I do not have a good voice for this!this might be of interest to retro electronics fansPDF linkhttps://drive.google.com/file/d/1ETn9fhRFw0PLNaYxqzmT0lMjtO2gvoWH/view?usp=sharing
An interesting "blame game" (fake xilinx in the authorized supply chain) - Page 1
Forum section: electronics / general

author: 3roomlab
author_rank: Frequent Contributor
timestamp: July 13, 2019, 05:40:48 pm
content: I thought I post this very interesting video I happen to be watchingBunnie huang speaking on supply chain security@ 5:28 he speaks about finding a chinese (edit : +authorized) distributor sending out "fake" xilinx chips mixed with real ones and xilinx knows it, weird.The way bunnie puts it, you may have thought it was your soldering that killed it? But it was really a fake chip mixed into the supply chainBlueHat IL 2019 - Andrew "bunnie" Huang - Supply Chain Security: "If I were a Nation State...”

author: Benta
author_rank: Super Contributor
timestamp: July 13, 2019, 05:52:57 pm
content: A "Chinese distributor" is not a "supply chain", it's just a risk. A "franchised distributor" is part of a supply chain and would never risk their franchise contract doing something like this. But well, cheap is cheap.
Simulink lookup tables - Page 1
Forum section: electronics / general

author: nForce
author_rank: Frequent Contributor
timestamp: July 13, 2019, 12:54:32 pm
content: I am trying to understand how does lookup table let's say 2-D lookup table work. What do I put in for "Table data" and "Breakpoints 1", "Breakpoints 2"? If I understand correctly, the "Table data" is the output and "Breakpoints" are input?If I define a vector in Matlab, let's say it's vector "A". Then I can insert this vector in "Breakpoints" as input. But the block has then input arrows indicating that it needs an input. Why is that? I have give him the input vector.Sorry, but can someone explain to me this. I have read this on Mathworks but I still don't get it.

author: nForce
author_rank: Frequent Contributor
timestamp: July 13, 2019, 03:34:56 pm
content: OK, maybe now I understand:The table data is the actual data we will look at to get the output. So it's a lookup table. Then the inputs on the block in Simulink, are the data which we want to get the solution. This input is for example a number, let's say 5. So we ask the lookup table, what is the corresponding solution. And we get the output for 5, let's say 10.But what are these breakpoints 1, 2 and so on? This I don't know.
I'm one resistor short... - Page 1
Forum section: electronics / general

author: rthorntn
author_rank: Frequent Contributor
timestamp: July 05, 2019, 06:02:18 am
content: Hi,I'm sure this happens to the best of them, anyone know where I can get one 1206 33r resistor in Australia?Ideally for less than $2 including postage, I have spent a bleeding small fortune on this Amiga 4000 build :-)Thanks.Richard

author: Siwastaja
author_rank: Super Contributor
timestamp: July 05, 2019, 06:21:49 am
content: If you are not in a hurry, how about Ebay? I don't usually buy components from Ebay anymore, but a resistor is very likely OK.https://www.ebay.com/itm/SMD-Resistor-1206-3216-33R-36R-39R-43R-47R-51R-56R-62R-68R-75R-82R-ohm/233085465934If in hurry, look for some local hacklab / electronics club and ask there.

author: rthorntn
author_rank: Frequent Contributor
timestamp: July 05, 2019, 06:25:27 am
content: Thanks, I'm in a hurry, it's the only thing holding me up.

author: Siwastaja
author_rank: Super Contributor
timestamp: July 05, 2019, 06:35:25 am
content: Consider bodging the required 33R from a series/parallel combination of any resistors you have lying around.

author: rthorntn
author_rank: Frequent Contributor
timestamp: July 05, 2019, 06:36:51 am
content: Thanks, I would rather not bodge it.

author: Brumby
author_rank: Unknown
timestamp: July 05, 2019, 06:58:15 am
content: You could do a neat bodge by stacking resistors in parallel. For example, a 3 story stack of 100 ohm resistors would give you what you want.

author: digsys
author_rank: Unknown
timestamp: July 05, 2019, 07:27:49 am
content: Quote from: rthorntnI have a few hundred in stock :-) Plus most every other value. Just PM me a postal address, and I'll post them free !! Will fit fine in an envelope.Add any other values / amounts / capacitors you may need as well - a waste to post just 1 resistor.

author: rthorntn
author_rank: Frequent Contributor
timestamp: July 13, 2019, 10:19:35 am
content: Huge thanks to digsys, he sent the resistors, the bottom side of the board is finished!!!Now on to the top, only 175 resistors, 74 capacitors, 20 IC's, 18 diodes and all the PTH connectors to solder...haha

author: digsys
author_rank: Unknown
timestamp: July 13, 2019, 11:11:03 am
content: Great news, was just about to see if you got them. Happy soldering
E.E. going after JPL subsequent to winning $1.5 million from NASA Contract Firm - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 13, 2019, 04:50:20 am
content: High Efficiency Power Supply Engineer sued ManTech for wrongful termination after whistleblowing, going after JPL for complicityhttps://www.theregister.co.uk/2019/07/13/nasa_mars_lander_engineer_jpl_lawsuit/
Affordable software for personal project management - Page 1
Forum section: electronics / general

author: elektrinis
author_rank: Regular Contributor
timestamp: July 12, 2019, 11:57:37 am
content: Not really electronics-related, but will be useful to any engineer.So I want to manage a personal construction project, it will take around 12-18 months.In the project I'll have many dependencies, many contractors with mixed costing: hourly, per job done, materials, fees, or any combination of these.I am looking for a free or sub-$10 management tool for convenient planning, time and budget tracking. Preferably with gantt chart, online (so it will work on windows and android).What I have found so far.Most online tools, even though they tick all other points, are designed for development teams: no budgeting and no external resources. While in my case it's all I need it to be about.Tried redmine, tried clickup, tried teamgantt. None fit my needs.In the end I found this:https://www.ganttexcel.com/Runs on excel, really old school. Has a very nice implementation and everything I need, and, most important, I can specify external resource and cost to every task. The problem is that it will not run online (including office365) and is too expensive ($80, free version only goes up to 10 tasks).So, are there any alternatives?

author: FreezeSSC
author_rank: Contributor
timestamp: July 12, 2019, 01:19:40 pm
content: I think you can download confluence and host on your own server for $10.

author: elektrinis
author_rank: Regular Contributor
timestamp: July 12, 2019, 07:37:42 pm
content: Quote from: FreezeSSC on July 12, 2019, 01:19:40 pmTried it. Doubt it's what I need though...
What?  Elon Must wasnt the founder of Tesla... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: July 13, 2019, 03:51:08 am
content: I never knew....See here:

author: mklengel
author_rank: Newbie
timestamp: July 13, 2019, 06:53:58 am
content: May be Elon Musk instead of Elon Must 😳

author: ggchab
author_rank: Frequent Contributor
timestamp: July 13, 2019, 08:16:02 am
content: Tesla evokes the name of one man: Nikola Tesla, a great man

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 13, 2019, 01:08:01 pm
content: What a shock.https://en.wikipedia.org/wiki/Tesla,_Inc.

author: wraper
author_rank: Unknown
timestamp: July 13, 2019, 01:20:45 pm
content: Quote from: BrianHG on July 13, 2019, 03:51:08 amThere is also the part that he almost rode company down the cliff and that's why he got ousted.

author: wraper
author_rank: Unknown
timestamp: July 13, 2019, 01:34:14 pm
content: https://www.greentechmedia.com/articles/read/teslas-elon-musk-rebuts-claims-by-martin-eberhardQuoteQuote

author: EEVblog
author_rank: Unknown
timestamp: July 13, 2019, 01:55:42 pm
content: They keep perpetuating the Hyperloop myth right at the start of the video, Elon and The Boring Company are NOT building a Hyperloop

author: bsudbrink
author_rank: Frequent Contributor
timestamp: July 13, 2019, 10:28:40 pm
content: Martin Eberhard is an active vintage computer collector/programmer.
The wife told the doctor I could measure her frequency! - Page 1
Forum section: electronics / general

author: darky8
author_rank: Contributor
timestamp: July 10, 2019, 04:54:55 pm
content: Hi,The wife is reaching that point in life, and she's been having a few problems... eh, keeping it in shall we say. So off to the Urologist she went.Now she's not up on what I do, but can pick up on a few buzz words especially if I've banged on out fixing it for weeks.So when doc said frequency, she told him "my husband has proper equipment that measures that".Any help on how I can dig myself out of this one gratefully received.I'm off to hide my probes...

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 10, 2019, 05:28:58 pm
content: Good one!

author: Stray Electron
author_rank: Super Contributor
timestamp: July 10, 2019, 07:03:47 pm
content: The doctors are probably used to hearing strange explanations from women in that, um, condition and I doubt that they give them much thought.Just keep your probe to your wife and yourself! Things should get better in 5 or 10 years.
Trying to recall old mail order company - Page 1
Forum section: electronics / general

author: epitaxial
author_rank: Contributor
timestamp: July 21, 2019, 11:41:25 pm
content: I'm trying to recall the name of a mail order company that advertised in the backs of electronics magazines in the mid 1990s. I bought a cheap little geiger counter from them that worked pretty well. They also sold odd things like a "magnetic" amplifier. Which was just a large ferrite balun in an enclosure. Anyone know what I'm talking about? Their name was like Electro-Man or something.

author: oPossum
author_rank: Super Contributor
timestamp: July 21, 2019, 11:50:07 pm
content: I don't recall any name like that.Maybe you can find one of the ads...https://www.americanradiohistory.com/Popular-Electronics-Guide.htm

author: edpalmer42
author_rank: Super Contributor
timestamp: July 22, 2019, 12:13:55 am
content: The Internet Archive has copies of most of the old electronics magazines like Popular Electronics, Radio Electronics, etc. You can browse through them and see if you can find the company.Ed

author: CatalinaWOW
author_rank: Super Contributor
timestamp: July 22, 2019, 12:21:40 am
content: I just looked at a couple of mags from that era and the only likely candidates seemed to be Electronic Rainbow and Electronic Goldmine. The latter always seemed to specialize in the kind of gear you describe so I would bet on that. They also still exist, selling via a web page among others.

author: epitaxial
author_rank: Contributor
timestamp: July 22, 2019, 12:30:29 am
content: Thanks for the tips. I started looking through them as well. This wasn't a typical electronics surplus place. They sold their own products and not parts. I was trying to find information about the geiger counter. After lots of digging it turned out to be a re-badged Russian dosimeter called the Master-1.

author: bdunham7
author_rank: Super Contributor
timestamp: July 22, 2019, 03:39:05 am
content: https://www.goldmine-elec-products.com/products.asp?dept=1468

author: Richard Crowley
author_rank: Super Contributor
timestamp: July 22, 2019, 06:25:05 am
content: Electronics Goldmine sells surplus electronic (and electro-mechanical) parts.https://www.goldmine-elec-products.com/But they also have a sister company that sells kits: Chaney Elecronics:https://www.electronickitsbychaneyelectronics.com/They have several Geiger counter kits, parts, and products:https://www.goldmine-elec-products.com/products.asp?dept=1468
3D printing using recycled plastic materials. - Page 1
Forum section: electronics / general

author: vk6zgo
author_rank: Super Contributor
timestamp: July 10, 2019, 02:48:06 am
content: I was watching the local TV news recently, & an item came up about artificial arms using recycled plastic materials.Obviously, the artificial arm bit was what they were most interested in. but they mentioned that they were 3D printed, & showed in passing a device extruding a plastic thread, which had been apparently produced from small "chips" of recycled plastic.This was being done by an individual who was collecting the plastic containers used by hairdressing salons, so wasn't on a large industrial scale.Has anyone heard of anything similat?

author: wilfred
author_rank: Super Contributor
timestamp: July 10, 2019, 03:21:27 am
content: Yes. I saw this item recently on ABC TV (Aust) Landline program about recycling various specific types of plastic products farmers have difficulty disposing of.https://www.abc.net.au/landline/farm-waste:-the-growing-problem-of-plastic-farm/11264632It isn't 3D-Printing but the cleaning shredding and pelleting for use as a plastic input to industrial production is covered. Superficially for mass audience of course.One such product is extruded plastic fence posts. My local supermarket has a couple showcase plastic bench seats produced to some extent from recycled plastic. It looks reminiscent of the park benches of my childhood made from precast reinforced concrete legs and back support that had wooden planks bolted on. I'm not altogether sure just how much progress has been made. I'd rather not see the plastic produced in the first place.

author: edavid
author_rank: Super Contributor
timestamp: July 10, 2019, 04:18:55 am
content: Quote from: vk6zgo on July 10, 2019, 02:48:06 amSure, here's an article about recycled filament:https://all3dp.com/2/the-3d-printer-filament-recycler-s-guide/

author: vk6zgo
author_rank: Super Contributor
timestamp: July 10, 2019, 08:01:03 am
content: Quote from: wilfred on July 10, 2019, 03:21:27 amNo, this was on ch7, & was definitely used in 3D printing.I know about the industrial recycling of plastic-----our "wheelie bin" was made that way, even the,first one that we had since 1988.It would have still been soldiering on, if it hadn't had an unfortunate demise in a bin fire!

author: Brumby
author_rank: Unknown
timestamp: July 10, 2019, 08:21:48 am
content: I've looked at the "recycled filament" angle to allow material from failed, unusable and obsolete prints to be used in creating fresh filament. The one issue that appears to be the primary concern of such personal systems is the dimensional accuracy of the filament produced. Filament with an irregular diameter will cause problems with prints.Obviously, the people in this story would have a machine of a higher standard than the common affordable personal systems.

author: sleemanj
author_rank: Super Contributor
timestamp: July 10, 2019, 09:09:38 am
content: https://hackaday.com/2019/07/08/no-filament-needed-in-this-direct-extrusion-3d-printer/
A4 / V2 Rocket in detail: Turbopump - Page 1
Forum section: electronics / general

author: Miyuki
author_rank: Frequent Contributor
timestamp: July 09, 2019, 05:56:04 pm
content: Maybe they said it in video I didn't watch it allBut why they use stream powered turbine and no just gas turbine with fuel they already have ? Was it problem at materials or was it just simpler to regulate to have second fuel for steam turbine ?

author: Kleinstein
author_rank: Super Contributor
timestamp: July 09, 2019, 06:36:24 pm
content: At that time gas turbines where just a new thing and high temperature materials were not that well available. Jet engines just started development. Also burning alcohol with oxygen gives very high temperature - hardly practical even with modern materials.Cooling the burn chamber with the liquid oxygen and using the gas generated their is likely hard to control.AFAIK the kind of steam driven turbine from hydrogen peroxide fuel was also used in torpedoes, though at a lower power level. So they could have reused some knowledge from there. There is not that much control going on - they seem to have just measured the power of the pumps in a test run and than adjusted with the flow reduction. Burning the fuel faster will also shorten the time the engine runs - so this compensates somewhat with the final speed and it seems like they has an extra measurement for the speed.
Articulated/in-out/up-down equipment mounting - Page 1
Forum section: electronics / general

author: 741
author_rank: Frequent Contributor
timestamp: July 09, 2019, 02:03:26 pm
content: Sometimes hospitals have some nice mountings for equipment. Something like a high-end TV stands perhaps.I thought it would be nice to be able to tuck 'scopes etc away flush to the wall, then "grab, swing & tilt" into optimum position (by my right ear, near my left elbow - whatever fits the bill at the time).So the equipment would be sort of 'floating' at the 3D position I really want, not just sitting on a desk.Are there some known makes for this?

author: capt bullshot
author_rank: Super Contributor
timestamp: July 09, 2019, 02:25:16 pm
content: We (Germans) use to call such kind of mounting "Siemens Lufthaken" (possible translation "skyhook")SCNR

author: Black Phoenix
author_rank: Super Contributor
timestamp: July 10, 2019, 09:33:01 am
content: I'm going to give a stupid idea.Can you use a Monitor Arm, the ones with the heaviest load possible, and fabricate a base that in one side is Vesa Compatible and put the equipment on top of it?You have arms that go from 6Kg to a max of 24Kg.Then fabricate an base L shaped in the small side with vesa mouth holes and supported on the bottom, if you understand what I'm saying.
Lower cost digital 3-axis gyro - Page 1
Forum section: electronics / general

author: raptor1956
author_rank: Frequent Contributor
timestamp: July 11, 2019, 07:41:52 pm
content: I'm looking into picking up a digital gyro with sufficient resolution to detect rotation down to 15 arcsec/sec and perhaps a bit better. Alternatively, increasing the sampling interval to 10 seconds or so might permit a bit less resolution. Ultimately, I want to be able to measure the rotation of the Earth which is just a bit over 15 degrees per hour or 15 arcsec/sec. There are LOTS of units in the $20-$80 range with many including 3-axis accelerometers as well as magnetometers and baro sensors and I'd be happy getting a more capable sensor so long as the price is right. I understand that MEMS is capable of detecting Earths rotation but just which model is hard to discern.Of course, when attempting to measure Earth's rotation it's a good idea to mount the sensor with a polar alignment and if the unit is sensitive enough the angular velocities should help with roughing the polar alignment. Such a sensor might speed telescope alignment, though to get down to sub arcmin accuracy I don't see anything but the highest performance laser gyros being able to do that. But, if getting a rough alignment is quicker then tweaking that by sighting on Polaris and other stars is still necessary.Brian
(ask)cheap overseas electronic components online store - Page 1
Forum section: electronics / general

author: e0ne199
author_rank: Regular Contributor
timestamp: July 01, 2019, 10:57:12 pm
content: hello everyone, i want to ask a question..does anybody here know about an online store that sells electronic components with, if possible, free shipping delivery?it is okay if it is on ebay or something like that, but for that one i really need a very trusted seller because the first time i bought something at ebay i actually bought a scam which would never arrive to my place...it is really dangerous to buy anything at ebay anyway...any answer is appreciated, thx before

author: sokoloff
author_rank: Super Contributor
timestamp: July 01, 2019, 11:06:52 pm
content: Aliexpress is my primary go-to for cheap parts and modules. Dx.com and banggood are also in the mix. I’ve looked at Taobao several times, but it’s always seemed like too much of a hassle to figure out.

author: edavid
author_rank: Super Contributor
timestamp: July 01, 2019, 11:55:44 pm
content: For free shipping, you are not going to do better than eBay/AliExpress, but you will encounter the occasional scam.Otherwise,http://www.taydaelectronics.comandhttp://lcsc.comare reliable sellers with cheap shipping.

author: e0ne199
author_rank: Regular Contributor
timestamp: July 02, 2019, 12:39:42 am
content: thx for the reply, it is okay if it is not a free shipping delivery as long as the shipping is cheap enough to pay because i just want to buy some electronic components and i don't want to pay for 50 dollars just to get it delivered, and i hope the seller can be trusted as well...if there is anyone else who wants to give some recommendations, you are welcome to post it here, hope this post can help someone who has the same needs as me

author: NorthGuy
author_rank: Super Contributor
timestamp: July 02, 2019, 12:53:18 am
content: Here, DigiKey or Mouser ship free if you order $100 or more.

author: Microcheap
author_rank: Frequent Contributor
timestamp: July 02, 2019, 03:56:11 am
content: I read here in the forum some recommendations aboutwww.utsource.netI've never used their services but I am considering to order some stuff from them to try.

author: e0ne199
author_rank: Regular Contributor
timestamp: July 02, 2019, 07:21:07 am
content: Quote from: NorthGuy on July 02, 2019, 12:53:18 ami have tried that and it seems that they don't give free shipping overseas

author: tkamiya
author_rank: Super Contributor
timestamp: July 04, 2019, 03:41:11 pm
content: eBay goods usually arrive just fine. But the problem is quality. Some has been totally junk. Some look fine but junk.I bought whole bunch of SMA connectors. It works but if I tried to torque it down or use it repeatedly, (few dozen times), it breaks.Anything moderately critical, I buy from Digi-key. (a local supplier in US). Things that doesn't really matter comes from eBay. If it's from eBay, I test the component myself before using.

author: Lord of nothing
author_rank: Super Contributor
timestamp: July 08, 2019, 08:21:48 pm
content: You are from Poland?Look here for someone who is from Germany and will re ship stuff from Conrad.de .
In depth video on the V2/A4 turbo pump and h2O2 steam generator - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: July 08, 2019, 03:17:30 pm
content: https://youtu.be/EgiMu8A3pi0Whats the trick to letting the playing be seen in the thread? Use youtube.com instead of youtu.be?
Raspberry Pi 4 USB-C power connector design botched!  - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 11, 2019, 06:57:15 am
content: Finally confirmed by the Raspberry Pi foundation on design flaw...https://www.techrepublic.com/article/your-new-raspberry-pi-4-wont-power-on-usb-c-cable-problem-now-officially-confirmed/
[SOLVED] Problems with starting a new post... - Page 1
Forum section: electronics / general

author: RichyJ
author_rank: Newbie
timestamp: July 08, 2019, 05:09:03 am
content: Hi,I've tried to create a new post in the Repair section. It's quite lengthy as I've included a lot of detail and 7 attachments (jpgs and pngs).Unfortunately, although it appears to upload, it never shows up in the forum. After the 'uploading' stage completes it returns me to the blank "Start a new post" page as if I hadn't typed anything at all - not sure what should happen normally.I don't get any message to say either "Success" or "Failed due to ...".Am I doing something wrong? I couldn't see anything in the Rules or guidelines. Is there a minimum number of posts needed before uploading a big topic?I waited overnight (about 8 hours) at first, in case there's a delay. I'm using Brave (Chrome-based) but tried in Firefox just in case.. No weird firewall setups or VPNs or anything.Thanks for your advice!Edit:Obviously this one made it so it's not a computer problem

author: tautech
author_rank: Super Contributor
timestamp: July 08, 2019, 05:14:51 am
content: Welcome to the forum.You may have exceeded the total attachment limit that's not long been extended to 5MB.Sometimes when I have a large post to place I prepare it in Word or similar and copy/paste it into the posting page.Try again with less content and add the remaining content with Modify or Edit.

author: RichyJ
author_rank: Newbie
timestamp: July 08, 2019, 05:17:16 am
content: Thanks, I'll try that now!

author: RichyJ
author_rank: Newbie
timestamp: July 08, 2019, 05:27:27 am
content: Thanks tautech - you were spot on about the attachment size limit. I hadn't noticed how big the png files were...Thanks for the speedy reply, the post has now worked!Should I (or you) delete this thread to declutter the forum?

author: tautech
author_rank: Super Contributor
timestamp: July 08, 2019, 05:31:46 am
content: We can’t delete threads, only the content of or your own posts.This is best left here as guidance for other newbies.

author: RichyJ
author_rank: Newbie
timestamp: July 08, 2019, 05:49:59 am
content: Good point - hopefully others can learn from my stupidity!!
Where are keys stored on firmware TPMs? - Page 1
Forum section: electronics / general

author: nezovenira
author_rank: Newbie
timestamp: July 07, 2019, 02:04:05 pm
content: Some Intel and AMD CPUs have fTPM function(TXT for Intel and PSP for AMD), where do they store the ecryption keys, in CPU or in motherboard?According to this:https://www.asus.com/us/support/FAQ/1032571/, it seems AMD systems store it mainly on motherboard, but still require the exact same CPU to use that data... I remember only a few old Intel CPUs have SN to identify, how AMD do this?
Error detection/correction for DDR4 memory? - Page 1
Forum section: electronics / general

author: nezovenira
author_rank: Newbie
timestamp: July 07, 2019, 02:02:24 pm
content: DDR4 standard have error detection(CRC/parity) as an optional feature, is it normally enabled on desktop or laptop? How to check it?And can we see the error logs in BIOS or OS(WHEA/MCE), just like for ECC memories?
Eva by Automata -  Low-cost robot arm - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 05, 2019, 09:05:27 am
content: Thought this was interesting - UK startup introduces a £5000 6-joint industrial robot.Anyone know the price of the nearest competition?https://automata.tech/http://www.eurekamagazine.co.uk/design-engineering-features/technology/low-cost-industrial-robot/217059/

author: lukier
author_rank: Unknown
timestamp: July 05, 2019, 09:43:16 am
content: This is really low cost compared to similar arms from Kinova or even Franka Emika.The specs unfortunately are silent on the stuff that's important nowadays in modern applications that involve Reinforcement Learning in the control loop. Stuff such as torque/force sensors in the joints.Is the kinematic chain compliant is also missing, 280W is quite some power, can do some harm.Also I wonder if this max 750mm/s toolpath velocity is valid with max payload (1.25 kg). Usually one needs much bigger robots to move mass that fast (e.g. ABB IRB-1400, 5 kg payload, 2 m/s, but this robot weighs 225kg).

author: H.O
author_rank: Frequent Contributor
timestamp: July 05, 2019, 01:10:23 pm
content: Motion looks a bit wobbly but then my experience is with much larger (and much more expensive) KUKA KR16 robots.QuoteControl software on subscription?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 05, 2019, 01:49:18 pm
content: Quote from: H.O on July 05, 2019, 01:10:23 pmThey say it's a lifetime sub somewhere

author: H.O
author_rank: Frequent Contributor
timestamp: July 06, 2019, 09:09:49 am
content: If that's the case then why not just give me a stand alone license?Subscription (be it it "free" and "lifetime"), to me, sounds like the thing is teathered to their server somehow - if they go tits up or decides to do the Autodesk manouver (plain out lie about their intentions) the thing becomes a £5000 paper weight.Oh well, that subscription thing just stood out when I read it.
Converters on F1 cars ? - Page 1
Forum section: electronics / general

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 08, 2019, 06:27:20 am
content: F1 cars are using energy recovery systems for heat from the turbo charger, and kinetic energy from braking. All thats 3-phase AC, then it can be stored in batteries after converting to DC, and converted back to AC again and fed back later. Too bad these era engines sound awful, they sure are impressive.Most all the electronics are at their thermal limits from engine heat and lack of cooling.I'd ask a bunch of questions about the electronics on board them, it's hard to find videos with actual technical chat

author: Berni
author_rank: Super Contributor
timestamp: July 08, 2019, 06:56:48 am
content: Well the teams do keep the latest technology a secret to avoid rival teams seeing it.But overall id expect it to be pretty similar to your usual brushless motor controllers you find in all sorts of RC models and electric vehicles. The power electronics for running a brushless motor or asynchronous 3 phase motor are the same, just the control algorithms are a bit different.But yeah no doubt those are some serious power electronics in there to handle these sort powers while also being as light and efficient as possible. The engines run at the brink of tearing themselves apart, so id expect those poor power transistors in there to also be running on the edge of blowing up.
Marvell Sells WIFI business to NXP - Page 1
Forum section: electronics / general

author: Gribo
author_rank: Frequent Contributor
timestamp: July 04, 2019, 02:34:45 am
content: This is going to be interesting.https://www.bloomberg.com/news/articles/2019-05-29/nxp-to-buy-marvell-wi-fi-connectivity-unit-in-1-76-billion-deal

author: Bassman59
author_rank: Super Contributor
timestamp: July 05, 2019, 08:04:33 pm
content: Quote from: Gribo on July 04, 2019, 02:34:45 amMaybe those of us whose designs aren't made in the millions will be able to buy these chips!
Apollo 11 video tapes going to auction - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: July 02, 2019, 09:44:57 pm
content: https://www.cnn.com/2019/07/02/us/nasa-intern-moon-landing-footage-sothebys-auction-trnd/index.html

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 04, 2019, 08:47:29 pm
content: No one's been to the Moon yet in person, sad to say, and most people believe the big lie.I'd like to see more of the footage of them putting a thing over the window to make the Earth look the size of a marble. That's real footage, what were they faking that for ?
GPIB Data Logging Like It's 1982 - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: July 01, 2019, 03:59:18 pm
content: Great video but one thing bugs me, a lot. I have always called it G-P-I-B with each letter spoken individually and G-PIB just sounds wrong. Who's right?

author: rrinker
author_rank: Super Contributor
timestamp: July 01, 2019, 05:14:28 pm
content: Funny, I've always said it as "GP IB" - two 'words'. Like GeePee EyeBee. Slight pause, instead of just saying all 4 letters in a row.SO now that's three ways of saying it..

author: 2N3055
author_rank: Super Contributor
timestamp: July 01, 2019, 06:07:52 pm
content: Quote from: rrinker on July 01, 2019, 05:14:28 pm1+HP (Agilent,Keysight) pronounce it that way.It used to be HP-IB (with dash) so it makes sense.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 01, 2019, 07:35:17 pm
content: Another strange way of saying something: I always say "mole-tee-me-ter" instead of "mole-ty-me-ter" as in the video.As for GPIB, I always said "gee-pee-aye-bee"...

author: Cubdriver
author_rank: Unknown
timestamp: July 02, 2019, 08:37:07 pm
content: I found his saying it as G-pib rather annoying, too. More so when he showed the connector on the rear of the unit clearly labeled HP-IB and still said H-pib. I've always simply rattled off the letters - GeePeeEyeBee or AychPeeEyeBee, with perhaps a hint of a pause in the middle.-Pat

author: Halcyon
author_rank: Unknown
timestamp: July 03, 2019, 12:07:43 am
content: "Gee-pib" can go sit in the same corner as "Sequel" (SQL).

author: bitseeker
author_rank: Super Contributor
timestamp: July 03, 2019, 04:22:19 am
content: Since it was originated by HP, they called it HP-IB. Of course, they wouldn't split their company's name to say H-PIB. Thus, when the interface was generalized and became GPIB (some instruments even labeled it GP-IB), the pronunciation only had to change to accommodate the different first letter.So, as far as I know, the correct pronunciation is G-P-I-B. Whether or not you pause for a fraction of a second between the second and third letter probably isn't significant. It's still easily recognizable. Saying Gee-pib, on the other hand, would require a much higher cognitive load to resolve.Pronouncing acronyms can be quite difficult, especially if you haven't heard others say them, since they often require the inclusion of invisible vowels to make them sound like words. RoHS comes to mind as an example of a weird and variously pronounced acronym.

author: TheSteve
author_rank: Unknown
timestamp: July 03, 2019, 04:39:42 am
content: The vintage gear was great, but as was already mentioned his pronunciation of the interface name is a total fail.

author: Nominal Animal
author_rank: Super Contributor
timestamp: July 04, 2019, 08:18:55 pm
content: I don't dare watch that video as I get squirrelly even hearing Stefan Gotteswinter say sur-face...
On Solvents... (type, purity, uses, etc) - Page 1
Forum section: electronics / general

author: MyHeadHz
author_rank: Regular Contributor
timestamp: July 04, 2019, 03:55:47 pm
content: There has been a lot of discussion on solvents lately, with differing opinions about a number of aspects. Some of them challenged my pre-conceived notions. So, I decided to do a bit of 'research' to make sense of the situation. The following video makes some convincing arguments on the topic. Are there any issues with this video, or does anyone have other useful information/links on the topic?
RGB What? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: July 02, 2019, 01:43:42 am
content: We had RGB RAM sticks, RGB motherboards, and even RGB power supply modular cables. And now we have RGB SSDs, and not just RGB LEDs, but a full TFT LCD panel on it just for the show.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 02, 2019, 02:33:45 am
content: RGB in PC case mods is best done with WS2812 strips connected to an Arduino or other microcontroller.

author: kjr18
author_rank: Regular Contributor
timestamp: July 02, 2019, 12:47:04 pm
content: This is what happens when you put too much blink on your stuff:

author: tooki
author_rank: Super Contributor
timestamp: July 02, 2019, 07:39:30 pm
content: What’d they do, run each LED off the 12V rail with an individual dropper resistor?But really... 75 LEDs?? It doesn’t even look that bright, which makes me wonder how much of the heat is the LEDs themselves and how much is the drive electronics...

author: Zero999
author_rank: Super Contributor
timestamp: July 02, 2019, 07:41:28 pm
content: The bit the original poster is talking about starts here.https://youtu.be/35W8bXuedDM?t=239Yes, pretty pointless. I hate this kind of crap. By the way the person in the video speaks far too quickly.

author: Nominal Animal
author_rank: Super Contributor
timestamp: July 02, 2019, 07:46:59 pm
content: The obligatory automotive analog:

author: Red Squirrel
author_rank: Super Contributor
timestamp: July 04, 2019, 12:31:10 pm
content: Quote from: NiHaoMike on July 02, 2019, 02:33:45 amThat's my thought as well. I have no experience with consumer RGB stuff but going to guess it's super proprietary and each product uses it's own thing. Probably need special software which probably only runs in windows.Best to setup everything yourself to work all together.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 04, 2019, 12:50:29 pm
content: Nice. I can't wait for a nice set of screwdrivers with a 600DPI IPS display allowing you to be notified of Twitter posts.

author: Zucca
author_rank: Unknown
timestamp: July 04, 2019, 12:51:25 pm
content: No sense.Anyway in my experience for a female customer the colors are more important than the specs.
Huawei giving 300 million $ per year to universities for electronics research - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 04, 2019, 05:53:41 am
content: The company will not ask for returns or a share of the IP from university labs that accept its funding.https://www.technologyreview.com/s/613917/huawei-is-giving-300-million-a-year-to-universities-with-no-strings-attached/
Y10GA HV diode forward bias @ 5v. Is it normal? - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: July 03, 2019, 04:22:08 am
content: Just trying to figure out if that is normal for a high voltage diode. Or if this diode is shot.Its forward bias is at ~5v. There is an image I made of it on my curve tracer.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 03, 2019, 04:34:47 am
content: If it's a diode rated to several kV, that's normal. I suspect there are internally many well matched diodes in series and/or the semiconductor material used has a wider bandgap. (Maybe someone who actually knows what's inside one can elaborate.)

author: Miyuki
author_rank: Frequent Contributor
timestamp: July 03, 2019, 04:49:55 am
content: This ancient diode will have terrible parametersThat datasheet say 22V @ 5mASo you must measure on so much higher voltagesIf I look at more modern BY8 it have 8V @ 500mAAnd even HV SiC diodes start to conduct at 3-4V range

author: floobydust
author_rank: Super Contributor
timestamp: July 03, 2019, 04:59:15 am
content: What is your test current and frequency?HV rectifier diodes seem to be (roughly) a series stack of 500 PIV diodes. So an 8kV part roughly has Vf about 16V at a few mA.Y10GA 6kV 5mA Vf=22V max. is pretty much the same as2CL70Vf=23V at 10mA, fast recovery.If you are applying only 5-10V, I would think it's only leakage current you should see and a sharper knee above that.The BY8 does better (lower Vf) I think it's a slow rectifier diode, for microwave ovens?

author: Miyuki
author_rank: Frequent Contributor
timestamp: July 03, 2019, 10:04:15 am
content: Here is nice Forward (and reverse) characteristics of fast HV diode for CRT (8kV one)

author: gkmaia
author_rank: Frequent Contributor
timestamp: July 03, 2019, 08:29:51 pm
content: Thanks guys, that was super helpful.
New e-bay scams with fake mailings - Page 1
Forum section: electronics / general

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: June 28, 2019, 11:17:33 pm
content: Seems E-bay is now full of sellers from Hong Kong selling various technical items for about half of the typical price, sometimes less. The sellers have 50-300 positive feedback score with account opened for the last 6 month to a year. Then they suddenly list a lot of items for a good price and sell dozens of each quickly. After some time they stop selling, make their feedback private, and that is when negative feedback numbers start to shoot up. They do ship something to generate tracking information, but I think it is an empty envelope sent to a different address. Sometimes it's obvious from tracking, sometimes they pick an address in the same zip code. Then E-bay says the item has been delivered.So far I have been burned twice, and even though I got my money back, it may not always work out this way. So if you see a good bargain from a seller which fits the above description - be aware.

author: james_s
author_rank: Super Contributor
timestamp: June 28, 2019, 11:26:17 pm
content: As the old saying goes, "If something seems too good to be true, it probably is."

author: thm_w
author_rank: Super Contributor
timestamp: June 28, 2019, 11:34:25 pm
content: Its going on for a long time,https://www.eevblog.com/forum/buysellwanted/deal-alert!-ut210e-us-$17-27-on-ebay!/https://www.eevblog.com/forum/testgear/der-ee-de-5000-counterfeit/

author: bdunham7
author_rank: Super Contributor
timestamp: July 02, 2019, 01:46:48 am
content: https://www.ebay.com/itm/30V-10A-Precision-Variable-DC-Power-Supply-w-Clip-Cable-Digital-Adjustable/273877728547?hash=item3fc4627d23:g:yW4AAOSwi3xcEODYThat listing is not fake, but there was a seller listing them for $8.99 shipped. They had a few other $50-100 items at $8.99. They had a prior sales history of fifteen items--and all 15 left feedback! They had sold literally hundreds of these items by the time I saw it. I notified eBay and they appear to have taken it down. So yes, if it is ridiculous deal, don't count on seeing it. I'm still wondering if my $42 FeelTech FY6600s will show.

author: Brumby
author_rank: Unknown
timestamp: July 02, 2019, 02:57:29 am
content: Quote from: thm_w on June 28, 2019, 11:34:25 pmYes ... quite a long time.
Huawei ban updates - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: June 29, 2019, 07:38:21 am
content: So I stayed up late for G20 meeting between Trump and Xi, and here's a very brief summary on Huawei issue to inform the fellow engineers here.I do not want to start a political debate, so please LOCK the thread right away, mods.1. Huawei is still limited from selling to US.2.Huawei will be lifted from entity list.Huawei will be lifted from importing instruments, not parts. Whether to remove it from entity list depends on an upcoming meeting the next week.3. US will not add new tariffs to China.4. US will issue new green card offerings to Chinese students.5. China will resume import agricultural products from US.6. China will keep decreasing import tariff as promised as part of WTO.7. Meng's extradition was not discussed.8. HK's recent political issues were not mentioned, instead, it was brought up to Xi by Abe.9. US's one China policy remains, but will keep selling weapons to Taiwan.

author: Zero999
author_rank: Super Contributor
timestamp: July 01, 2019, 09:56:34 am
content: All of this trade war/tariff/ban stuff is retarded, but it's still good to keep infrastructure owned by companies based in the same state. I don't even like the fact that the UK power grid has been sold off to the French. Fair enough, at least the UK have better relations and more in common with them, than the Chinese but it still isn't good.
Australia watchdog file lawsuit against Samsung for false advertising  - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 04, 2019, 06:16:51 pm
content: Samsung created "false, misleading and deceptive" representations in marketing material about the Galaxy smartphone range's resistance to water and consistently dismissed warranty claims due to water damage.https://www.theregister.co.uk/2019/07/04/samsung_accused_of_misleading_consumers_over_claims_of_water_resistant_galaxy_phones/https://www.accc.gov.au/media-release/samsung-in-court-for-misleading-phone-water-resistance-advertisements