hybridfree/eevblog-posts huggingface dataset:
Could opto osolators be used in place of transistors? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 18, 2019, 11:41:19 pm
content: You would think this would be the precursor to transistors or are they made from the same silicon technology as the transistor so no point if you can already do that. Would an opto work like a fet/tube or like an bipolar? It allows current to pass in proportion with how bright the led is; brighter = more current flow? Would you call that a current or voltage controlled device in this application?

author: MasterT
author_rank: Frequent Contributor
timestamp: August 19, 2019, 12:25:50 am
content: H11F1M, H11F2M, H11F3MPhoto FET Optocouplers

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 19, 2019, 01:04:32 am
content: Optoisolators with a greater than unity current gain generally use some sort of transistor on the output. Oversimplified way of looking at it is that a LED turns electrons to photons while a photodiode turns photons to electrons. (Not technically correct but it is a way to understand it.) Thus, X number of electrons makes at most X number of photons which makes at most X number of electrons, for a theoretical maximum of unity gain.In reality, the precursor to the solid state optoisolator would be some sort of lamp (incandescent or neon) coupled to a photoelectric tube.

author: Beamin
author_rank: Super Contributor
timestamp: August 19, 2019, 05:48:28 pm
content: Quote from: NiHaoMike on August 19, 2019, 01:04:32 amAnd that's where the expression "over unity" comes from, I did not know that. Can you make a perpetual motion machine harvesting free over unity energy?

author: soldar
author_rank: Super Contributor
timestamp: August 19, 2019, 06:50:40 pm
content: Quote from: Beamin on August 19, 2019, 05:48:28 pmSure. Just search YouTube.

author: Zero999
author_rank: Super Contributor
timestamp: August 19, 2019, 08:18:23 pm
content: Quote from: Beamin on August 19, 2019, 05:48:28 pmNo, he's talking about current gain. No energy is created.The opto-coupler is an amplifier which gets all of its energy from the power supply, like any other amplifier.
2003 April/May Electronics Design - Page 1
Forum section: electronics / general

author: jpyeron
author_rank: Regular Contributor
timestamp: August 18, 2019, 06:25:23 pm
content: I am having trouble finding my old copies from 2003, and I wanted to read the articlehttps://www.electronicdesign.com/boards/simple-high-efficiency-current-source-adjustable, which is missing the diagram.Anyone have it?

author: mathsquid
author_rank: Frequent Contributor
timestamp: August 18, 2019, 09:43:56 pm
content: Is this the one you're looking for?

author: jpyeron
author_rank: Regular Contributor
timestamp: August 19, 2019, 01:06:17 pm
content: Yes!Thank you.
Different Fields in EE - Page 1
Forum section: electronics / general

author: MauriceT
author_rank: Newbie
timestamp: August 18, 2019, 11:14:08 pm
content: Hi,I am an undergraduate student of sophomore standing studying Electrical and Computer engineering. I know that there are a lot of different career paths in EE, and I am unsure of how to figure out exactly what I want to do in electrical engineering. If anyone has a list of different types of EE careers, or advice on how to narrow down my options that would be very much appreciated. The only topic that I currently have particular interest in is PCB design, but I'm not sure if there are jobs where you specifically design PCBs.Thank you!
Worlds fastest shredder - GDPR Compliant! - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: August 18, 2019, 10:11:12 am
content: It have a so satisfying sound when working...

author: ddavidebor
author_rank: Super Contributor
timestamp: August 18, 2019, 03:23:23 pm
content: When he turned off the switch and his hand got close i panicked
Getting First Engineering Internship - Page 1
Forum section: electronics / general

author: MauriceT
author_rank: Newbie
timestamp: August 18, 2019, 02:19:29 am
content: Hello,I am currently in my second year as an electrical and computer engineering student, and could use some advice on the best ways to stand out to employers in industry. I have currently completed one project through one of my courses, and I know that projects are one good way to stand out, but I was wondering if anybody has any other good ideas to help me get my foot in the door. The only work experience I have is in food production, and I have only completed one project, so currently my resume is pretty weak. Any thoughtful advice on ways to get my first internship or ideas for beginner projects would be much appreciated!Thank you!

author: Stray Electron
author_rank: Super Contributor
timestamp: August 18, 2019, 02:28:58 am
content: NETWORK! Join IEEE and any other engineering groups at your school and get out and get to know people that are connected to the industries that you want to get into. Get involved with organizing any events that those clubs have. Most jobs including internships are found by word of mouth from a friend of a friend. The more connections you have, the more likely that you'll hear of internships and/or job openings.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 18, 2019, 04:56:57 am
content: Do more projects, even if only for fun. See if there's a maker group in the university. If you're lucky, they might even have a hackerspace. (At Texas A&M, they have Cepheid Variable, which is more targeted towards software projects. Hardware projects are also sometimes done but you supply the tools.)

author: MosherIV
author_rank: Super Contributor
timestamp: August 18, 2019, 10:06:42 am
content: HiWelcome to the forum.What the others have said is good.Do not worry too much, it is expected that undergraduates (the term used in UK for someone still reading for their degree) have little to no experience.What companies look for is attitude and aptitude.Companies want 'engineers' who are logical and methodical.Can you solve problems?Can you write clear problem statements?Can you determine what to measure or experiment to determin the variables?Can you generate a list of solutions?How do you determine the best solution?Sometimes, the ones with lots of project are not the best because they have developed bad habits and attitude.The projects will give you knowledge about specific technologies and devices. Which may be useful or not if it is not used in the companies you are applying to.
10 atom layer thick thermal shields - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 17, 2019, 03:44:08 am
content: https://science.slashdot.org/story/19/08/16/2142208/researchers-build-a-heat-shield-just-10-atoms-thick-to-protect-electronic-devices

author: Nominal Animal
author_rank: Super Contributor
timestamp: August 17, 2019, 06:24:39 pm
content: Without reading the underlying peer-reviewed article or research, and thus not knowing how it actually works, I suspect this too is one of the cases where an "impedance mismatch" is used as a tool to produce a desired effect.Essentially, you can use layers of differing heat conductivity to get an effect larger than one would estimate from the individual layers, because of how the layers affect the overall heat flow in that system. I recently suggested in another thread here the very same approach to sound/vibration dampening, relying on the very same phenomenon.(I've toyed with simulating the effect at atomic scale (both heat flow and acoustic waves use basically the same simulation), but thus far it has been outside my reach.)In any case, it's very interesting stuff.
Why would an MS surface not charge if the power supply is fine? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 17, 2019, 05:35:59 am
content: I have been having problems getting this 2018 Microsoft surface less then a year old to charge. It has a really weird and expensive power supply that works sometimes- well the charger seems to be turned on by the computer you plug it in and a light on the charge plug itself lights after about a second.But the only way to get this to charge is to take the primary or 110vac figure eight or wall plug in and out several times and after many attempts the LED will come on. Trying this same thing using the plug to the computer be it the keyboard or to the tablet it self directly it won't charge. Only the AC side power cycles work, and it seems to take about 10 tries. I just bought two different power supplies a generic and an $99 Microsoft one and same problem!!!! I don't get it is this software firmware? Several upgrades have been done to windows but that doesn't seem to make it worse or better.Also sometimes when you have the screen plugged into the keyboard it will "detach" not physically but makes the detach noise and goes into "tablet mode". This computer was 1400$ and I can't exactly afford a new one after nine months of use. Why would it do this? So strange.

author: MrMobodies
author_rank: Super Contributor
timestamp: August 17, 2019, 05:46:11 am
content: I had a similar issue with one of first models where the charging light went out and movement affected it.I thought at first there maybe a breakage in the cable but it turned out the contacts were dirty and grime was stopping the connector going all the way in.

author: Beamin
author_rank: Super Contributor
timestamp: August 17, 2019, 06:04:59 am
content: Quote from: MrMobodies on August 17, 2019, 05:46:11 amFunny you mention that literally right before I read that it was charging, I did the replugging of the AC side and it was charging I then moved it slightly enough that the hinge wiggled and it went out. I tried claning the contacts with alcohol but this laptop is always on the charger, initially I ducked taped the charger into it so that I wouldn't have this problem and never undocked for fear of making it worse. So brand new contacts and ones never exposed to dust. This is driving me nuts and pissing me off at this point.What did you use to clean the contacts on the inside of the tablet part? I wiped the outer ones with IPA but as I said this is new-er and never exposed to dust/grime I keep food away from it.

author: MrMobodies
author_rank: Super Contributor
timestamp: August 17, 2019, 05:17:57 pm
content: I think it was alcohol 70% IPA wipes that I used.
Photographing light - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: August 16, 2019, 03:23:52 pm
content: First ever photograph og light as both wave and particle.https://phys.org/news/2015-03-particle.html?fbclid=IwAR3JKmtch13IA5FTNG_5Q7mEwbcsmcq_JuA2j8Z6m4l9Afyz372U9sETlg0

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 17, 2019, 12:21:15 pm
content: So, what about... First ever photo of a particular Radio FrequencyIt may well be known now/here, that I am NOT a 'purporter' of what generally falls under thecategory of "Quantum" Physics, including the notion of Particles/Waves to explain the unknown.We have what we call an 'Oxymoron', where we say the 'opposite' like "Military Intelligence".However, this must be an "Anti-Oxymoron".... "Photographing Light"... Well.. yea !!!Totally off topic now, (though am I xx), as a photographer, I used to photograph light !! (It's true!).I even "Painted with light". This involves a camera on a tripod, special filter, shutter open, and insidea Church or what ever, literally 'paint' the scene using a Spot-Light, to selectively 'burn' the sceneinto the 'film' (digital sensor). . . . . Anyway... 'Photon' = singular quantity of 'energy'....
light bulb - unusual connector - Page 1
Forum section: electronics / general

author: degie89
author_rank: Newbie
timestamp: August 19, 2019, 12:51:33 pm
content: Does anyone know the connector that matches this bulb?https://www.medlamps.co.uk/heine-x-01-88-056-equivalent-2-5v-lamp.htmlI know that it is used in otoscopes.

author: edy
author_rank: Super Contributor
timestamp: August 19, 2019, 02:54:49 pm
content: Wow that lamp looks like a 22 bullet! How strange!

author: james_s
author_rank: Super Contributor
timestamp: August 19, 2019, 04:16:35 pm
content: Otoscopes are the only place I've ever seen those bulbs used. There are a few oddball bulbs out there that are medical specific.

author: soldar
author_rank: Super Contributor
timestamp: August 19, 2019, 04:24:51 pm
content: By "connector" I assume you mean "lamp holder" or "socket" and if the lamp is "Heine X-01.88.056 lamp" then I would say you are looking for a "Heine X-01.88.056 lamp-holder or socket".

author: edy
author_rank: Super Contributor
timestamp: August 19, 2019, 05:54:21 pm
content: Based on the kind of instrument and the number of different brands available, it looks like some proprietary manufacturer-based standard.I wonder if the "socket" is actually just the interior design of the moulded device itself, and not some separately made connector? They just make the plastic casing the right size and shape and put contacts in the proper place to make it work.

author: james_s
author_rank: Super Contributor
timestamp: August 19, 2019, 07:43:38 pm
content: The ones I've seen have been machined metal, the "socket" is just a drilled hole in the casting with a contact on the part that attaches to the battery.

author: amyk
author_rank: Super Contributor
timestamp: August 20, 2019, 01:18:38 am
content: 4507-1 looks far more "normal"... and I agree, the other all look like bullets.Medical stuff is expensive, this must be their way of getting paid. I bet all the others just have the same glass bulb as 4507 installed in a proprietary base.

author: degie89
author_rank: Newbie
timestamp: August 20, 2019, 12:06:35 pm
content: So I would have to dismantle it? It is a pity because it costs a lot for such a small light bulb.I was hoping that there was a dedicated socket.

author: james_s
author_rank: Super Contributor
timestamp: August 20, 2019, 02:59:24 pm
content: What are you trying to do? Yes the bulbs are expensive, but I've seen them last many years. Otoscopes typically don't get a lot of hours.
Bondic mate! - Page 1
Forum section: electronics / general

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 16, 2019, 04:04:41 pm
content: I've just got some Bondic which is a kind of viscous glue that only hardens when UV light is shone upon it.You get a tube of the glue and a small UV light source.It's pretty good. I use if to strengthen otherwise weak soldered joints especially where flexing happens, e.g. affixing jumper wires to battery packs.I wondered if anyone knows of a similar but much cheaper version of this UV bonding glue?

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 16, 2019, 04:28:55 pm
content: https://www.walmart.com/ip/3-Second-Rapid-Repair-Fix-UV-Light-Repair-Tool-Liquid-Plastic-Weld-As-Seen-on-TV/537372294?wmlspartner=wlpa&selectedSellerId=101003192&adid=22222222227294671125&wl0=&wl1=g&wl2=t&wl3=359278290713&wl4=pla-776663058162&wl5=9008008&wl6=&wl7=&wl8=&wl9=pla&wl10=130868554&wl11=online&wl12=537372294&veh=sem&gclid=EAIaIQobChMI0fHukOeH5AIVAp6fCh2FpAIFEAQYASABEgL13PD_BwEhttps://www.amazon.com/Ontel-Second-Fix-Liquid-Plastic-Welding/dp/B016MB0JF6/ref=asc_df_B016MB0JF6/?tag=hyprod-20&linkCode=df0&hvadid=219561413405&hvpos=1o2&hvnetw=g&hvrand=5357543933222329747&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9008008&hvtargid=pla-365511736921&psc=1

author: PerranOak
author_rank: Frequent Contributor
timestamp: August 17, 2019, 11:36:04 am
content: Excellent, cheers mate.

author: Synthtech
author_rank: Regular Contributor
timestamp: August 17, 2019, 11:58:01 am
content: I have tried some of the cheap copies of Bondic and ended up throwing them away. Buy the real thing, get the expected result. Buy a cheap copy and it becomes expensive because it doesn’t work as expected.
Quantum Computers - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: August 16, 2019, 04:57:08 pm
content: Quantum computing looks like analog computing with extra steps.Anybody else with same feeling?What will be those distinctive and fundamental *must have* properties, such they are to be found only in the quantum world but not in a macroscopic analog computer?

author: emece67
author_rank: Frequent Contributor
timestamp: August 16, 2019, 05:18:11 pm
content: .
Cisco gets shut out of China; Lays off 500, Stagnant Outlook - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: August 16, 2019, 01:54:25 am
content: Cisco admits being "uninvited" by Chinese enterprises; sheds jobs, provides stagnant forward guidance, as it moves contract manufacturing out of China to reduce tariff costs.https://www.theregister.co.uk/2019/08/15/cisco_job_cuts/

author: David Hess
author_rank: Super Contributor
timestamp: August 16, 2019, 04:10:05 am
content: Cisco should have been prepared for that years ago for many reasons having nothing to do with the current kerfuffle.
Anyone  played with Sparc and PowerPC servers? - Page 1
Forum section: electronics / general

author: sezarakene
author_rank: Newbie
timestamp: August 14, 2019, 07:25:52 am
content: Hi guys.One of my friend want to get an old Sparc or PowerPC server with graphic output. But he noticed Oracle's website says "You cannot use a local graphics monitor to perform the initial server installation, nor can you use a local graphics monitor to view POST messages." Is this also true for all Sun Sparc servers even with integrated VGA port? The POST screen will only output to serial port on all Sun Sparc servers?How about those PowerPC servers? (Exclude Apple ones)Thanks.

author: bson
author_rank: Unknown
timestamp: August 16, 2019, 01:17:15 am
content: How old is old? I worked at Sun Microsystems in the 90s and back then this was the case. But I also recall it being settable in OBP, and servers were factory configured to use the serial port but could be reconfigured - but you'd need to use the serial console at least once. It's been a while though...https://docs.oracle.com/cd/E19457-01/801-7042/801-7042.pdfSomething like 'setenv output-device screen'; see page 24.But things may have been different in the Oracle era.
Are you getting purchase/payment emails from AliExpress? - Page 1
Forum section: electronics / general

author: Rick Law
author_rank: Super Contributor
timestamp: August 15, 2019, 02:51:14 am
content: It this happens to you too?Email from AliExpress has been missing; Ordered Aug 8 (multiple), Aug 13, and today Aug 14 -normally I would receive order confirmation email and payment email for each order, but none came for those three days.I checked all the AliExpress notification settings this morning, and all notifications are on. I logged in to gmail directly and checked all folders - nothing there.Interestingly, I did an order-dispute on AliExpress last night. Within minutes, I got an email from AliExpress of a favorable resolution.So, this AliExpress email came without problem...So, something is not right. I was thinking, it may be gmail "spam" filters, or filters at the ISP between AliExpress and Gmail.Anyone else experiencing "missing email" phenomenon?

author: MasterT
author_rank: Frequent Contributor
timestamp: August 15, 2019, 09:55:44 am
content: Run:mtr --report --report-cycles 10www.aliexpress.com> aliexpress.txtSee what you get, e1429.x.akamaiedge.net or something similar. Akamai - crap intercept all my connections to ali, ebay, banggood etc for a few years.
Cap gore - Page 1
Forum section: electronics / general

author: technix
author_rank: Super Contributor
timestamp: August 13, 2019, 03:49:31 pm
content: Well one of my set top boxes stopped working. So...Oops. Cap gore.Well with my box of electrolytic capacitors ready, after a quick replacementThe blown no-name 4.7mF/10V cap is replaced with a Jamicon 1mF/10V and a Topaz 220µF/16V caps. (The no-name cap was itself my repair job, before I built up my electrolytic cap collection. The original board has two 470µF/10V caps there) And the smaller no-name 470µF/10V cap on the 5V rail is replaced with a (Japanese brand, actual brand name forgotten) 560µF/6.3V solid electrolyte cap.

author: 001
author_rank: Super Contributor
timestamp: August 13, 2019, 04:22:38 pm
content: awesome photos!What does "Gore" mean?

author: technix
author_rank: Super Contributor
timestamp: August 13, 2019, 04:32:49 pm
content: Quote from: 001 on August 13, 2019, 04:22:38 pmThose caps blew due to internal heating and drying up.

author: wraper
author_rank: Unknown
timestamp: August 13, 2019, 04:38:52 pm
content: I expected everything covered in electrolyte aka capacitor blood and their internals scattered aroundas you called it gore in the title.

author: Chriss
author_rank: Frequent Contributor
timestamp: August 13, 2019, 05:02:55 pm
content: Hi!Nice job done and another tool saved from junk jard.Well done.Sent from my SM-J500F using Tapatalk

author: technix
author_rank: Super Contributor
timestamp: August 14, 2019, 01:56:45 am
content: Quote from: wraper on August 13, 2019, 04:38:52 pmWhat is this board? And why did it blew up that spectacularly?

author: technix
author_rank: Super Contributor
timestamp: August 14, 2019, 01:59:33 am
content: Quote from: Chriss on August 13, 2019, 05:02:55 pmWell it is my second go at fixing this.This STB used to be owned by a friend of mine, stopped working due to the caps blown up, then when she called the repairman she is given a replacement STB while she kept this one. She gave it to me and I recapped it and used it as mine. Now the caps I put in there blew, and I recapped it again.It appeared to me that almost 80% of dead modern electronics comes from electrolytic caps drying up and blowing up. If those are made to be easy to take apart those can often be easily fixed by recapping, thus saved from the garbage pile.
What do you think of Huaqiang North shenzhen china？ - Page 1
Forum section: electronics / general

author: jamesblunin
author_rank: Newbie
timestamp: August 14, 2019, 01:02:19 am
content: Hello,I'm new here. I'm James from Singapore. I'll have a Chinese vacation next month.Cuz, I am an electronic engineer. At first I wanted to go to Shenzhen Huaqiang North, some ofmy friend told me that if I go to China, I should not miss it. What do you think?Feel free to comment. I would appreciate it if you could order some photos.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 14, 2019, 01:15:00 am
content: Take a VR tour:Apparently, it's an interesting place to explore but there really is a lot to look at. Don't expect to do a quick walk through.

author: jamesblunin
author_rank: Newbie
timestamp: August 14, 2019, 01:19:44 am
content: Oh,Thanks for you help.I've seen this video
"air conduction technology" hearing aid - Page 1
Forum section: electronics / general

author: gary2468
author_rank: Newbie
timestamp: August 13, 2019, 10:37:32 pm
content: anyone seen these ads?Isn't air conduction how sound normally travels through air?

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 13, 2019, 11:03:41 pm
content: Indeed. AFAIK, "air conduction" hearing aids are the conventional hearing aids with small transducers that still move the eardrums through air inside the ear canal, as opposed to bone conduction for instance or other kinds of hearing aids.
Kitting Service? - Page 1
Forum section: electronics / general

author: ludzinc
author_rank: Unknown
timestamp: August 13, 2019, 05:29:26 am
content: Hi AllDoes anyone know of / have experience with a kitting service from a chinese supplier?What do I mean?I want to put together some 'learning to solder' kits (for scouts / school projects etc) and while the parts list is rather basic, I'd rather not order order the bits from individual Aliexpress shops and put them together myself, but rather supply a BOM to one and have them supply 100 bags of kited parts.Is this even possible? So far the closest I've come is LCSC but stumble at the fact some parts come in MOQ's above one (I really don't want to accidently order 100 lots of 20 pieces!) and thought I'd seek advice here.Appreciate to hear your thoughts, even if the solution might be getting the scouts to kit the stuff themselves.Thanks all!

author: JDubU
author_rank: Frequent Contributor
timestamp: August 13, 2019, 06:10:10 am
content: Maybe a Chinese PCB assembly house could do it?For example, a quick Google search:https://www.7pcb.com/PCB-Assembly-Components.php
On Call: Tech Service Tales at The Register - Page 1
Forum section: electronics / general

author: Deodand2014
author_rank: Regular Contributor
timestamp: August 13, 2019, 03:02:41 am
content: Everyone knows, if something goes wrong call tech service, but what happens to theweirdcalls...They end up appearing in The Register's (An 'interesting' IT related website) 'On Call' feature, being a compilation of the tricky, the bizarre and just plain 'what the...?'Learn what happens when someone:*. Forgets to renew their software license for years.*. Puts their computer in a 'bad spot'*. Answers a tech service call while 'three sheets to the wind'.*. Thinks their computer is emitting 'negative waves'And much, much more...https://www.theregister.co.uk/Tag/on-call
The Ignore topics option. Do you use it? - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: August 11, 2019, 01:20:31 am
content: I use it to cut down on the number of low interest topics I get in my "Unread Topics" list. Particularly the ones that are likely to become bunfights with people arguing over small differences. These typically always reappear due to the number of replies they get.I'm curious about whether others use it and why? I am wondering if people who do not enter the forum via the "Unread Topics" list also feel a need.As an early forum member I have recollections of a time before the debunking and busted and gender wars type topics existed and I am starting to feel overwhelmed by the torrent of them lately. I wonder if the list of most ignored topics is similar to my own. I think the forum is a bit schizophrenic nowadays with a clear distinction between civilised, friendly and helpful topics and ones destined to be bunfights.Don't get me wrong, I don't mind that the bunfights exist. They perform a useful function.

author: GK
author_rank: Super Contributor
timestamp: August 11, 2019, 03:34:44 am
content: Um, this place has always had bunfights.The mtdoc/dannyf/zapta left/right wing loony wars?Where did Uncle Vernon and Bored@work go?

author: edavid
author_rank: Super Contributor
timestamp: August 11, 2019, 03:42:19 am
content: I use it all the time, and wish the 100 (?) topic limit could be increased.A common use is when I've posted to a topic, and then it degenerated to the point that I don't want to see followup posts, but I don't want to delete my own post.An unsubscribe button would work just as well for that case, and wouldn't require table space.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 11, 2019, 03:20:16 pm
content: Yes, typically to ignore a thread that I've replied to, but no longer have interest in. I normally access threads through the Show Unread Posts links.Would think it reasonable to expire ignores either in a queue (oldest ones get pushed out) or by time since ticking ignore.Tim
Mechanical "information" propagation. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: August 10, 2019, 08:32:49 am
content: Let's assume we have a metal rod 1 meter in length. I I push the one end with my finger, what is the time it takes the other end to start moving? The speed of sound in the material divided by the length?Can this time be measured by sticking two piezo sensors in each end measure the difference of the two pulses generated?Alexander.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 10, 2019, 10:38:53 am
content: In the same way that free space has inductance and capacitance (mu_0 ~= 1.257 uH/m, e_0 ~= 8.84 pF/m), and together these define the impedance of free space and the speed of light (Zo = sqrt(mu_0 / e_0), c_o = 1 / sqrt(mu_0 e_0)), so too do the density, and stiffness (elastic modulus), define the acoustic impedance and speed of sound of a bulk material.There are different kinds of waves in solids, so you need to use the right units (shear modulus <--> shear velocity, etc.), to get the respective wave property.The best part is, this not only tells you how much the pulses will be delayed, but also how best to connect those piezo discs so the pulse will be strong. (Namely: matched to a TL of the same impedance as the piezo disc, and placed inline, not just at the end. The reason is easy to see, if you draw a free-body diagram of the piezo with respect to the pressure and displacement applied to it. If there's no reaction mass behind it, it's just flapping in the breeze, and will only transmit what pressure is dropped across its thickness, which will not be much at most frequencies.)Tim
Gary Johnston (Jaycar) on the French / Australian Nuclear Submarine Contract - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: August 09, 2019, 01:59:55 am
content: Relevant to here because it's Jaycar's Gary Johnston, and because France want to charge Australia $6BN todesignthe diesel version of their nuclear submarine. He calculates the number of engineers you can hire for that money.I've seen some cluster !@#$ government contracts before but this one has to take the cake.Twitter Warning: Includes Alan Jones

author: wilfred
author_rank: Super Contributor
timestamp: August 09, 2019, 02:10:18 am
content: Thanks for the warning.FYI Americans, Alan Jones might be our equivalent to Rush Limbaugh. At least in terms of selling opinions for profit, if not the actual opinions.

author: VK3DRB
author_rank: Super Contributor
timestamp: August 09, 2019, 04:34:59 pm
content: Jaycar ripped off the Arduino Experimenter's Kit design from Freetronics in 2016. Hence, I have no interest in Jaycar, or Gary Johnston's opinion on anything. I looked at a few other news sources online. The waste on the subs could be summed up in the saying: "People are very 'good' with other people's money." Hey, at least wasting the money is better than spending it hoarding nuclear weapons like the countries in this list do...https://en.wikipedia.org/wiki/List_of_states_with_nuclear_weapons. All countries with nuclear weapons should be be classified as terrorists.
ex-HP sites in Colorado? - Page 1
Forum section: electronics / general

author: GregDunn
author_rank: Frequent Contributor
timestamp: June 28, 2019, 08:57:55 pm
content: I'm going to be in Loveland next month shooting a big tournament, and I'm already planning to visit the former site of HP's computer division. Are there any other places in the area which might be of casual interest to someone who never got to see the company locations during its heyday?

author: tggzzz
author_rank: Super Contributor
timestamp: June 28, 2019, 10:19:51 pm
content: Fort Collins and Colorado Springs come to mind.

author: German_EE
author_rank: Super Contributor
timestamp: June 30, 2019, 06:38:57 pm
content: Sure you want to do this?I had the same idea about a tour around the UK visiting all the sites that were significant when the UK had a computing industry. I got about a third of the way through then gave up as it was too depressing and not much was left.

author: wkb
author_rank: Super Contributor
timestamp: August 08, 2019, 10:33:09 pm
content: Used to travel to CXO at least once a year while working for the HP storage division. Good fun really, generally added vacation to the trip, visiting the Rockies but more often travelled around in Utah.Not sure but I think someone told me the whole of the CXO site got demolishedEarlier I got to see the outside of The Mill, Digital Equipment HQ. Depressing given DEC had gone t^^ up by thenAll just memories now
Grr.  What is eating my newlines in forum posts? - Page 1
Forum section: electronics / general

author: westfw
author_rank: Super Contributor
timestamp: August 07, 2019, 02:10:28 am
content: Something is removing newlines from my attempts at posts. Usually this takes the form of replacing multiple newlines with a single one (which would be vaguely understandable as "preserve vertical screen space), but occasionally newlines are missing entirely, really screwing up formatting.For example, in this post:https://www.eevblog.com/forum/programming/the-rust-megathread/msg2598726/#msg2598726, the boldface "string_view" was at the start of a new line.I've even had this happen inside of code tags :-(I suppose that this could be either my browser (Firefox 68.0.1), my OS (MacOS 10.13.6 on a Hackintosh), or something in the forum software... Any ideas? (This post used to have double-spacing between paragraphs, too...)

author: wilfred
author_rank: Super Contributor
timestamp: August 07, 2019, 02:59:34 am
content: If it was Forum software others would be reporting it too. Trying another browser or trying FF in safe mode might help narrow down the cause. Can you pin down when you first noticed this? That might help you recall some other change you might have made. Also check your OS update history. Search for similar issues others are reporting elsewhere.Line1.Line 2 four newlines later.

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 07, 2019, 03:38:54 am
content: found the culprit,##. ,== .,# #. \ o ' ,# # _ _ \ \# # (_) (_) / ;`# #' / . '`##' "== "

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 08, 2019, 12:52:07 pm
content: Probably browser based, or your 'device'... (computer/laptop, iPad, smart phone ??)Much to some peoples disgust!!, I personally insert 'Carriage Returns' between lines.Unless someone has an old 'computer' with 640x480 resolution, I do NOT want textsuch as this, to word-wrap and be broken up !!

author: SparkyFX
author_rank: Frequent Contributor
timestamp: August 08, 2019, 01:52:09 pm
content: "Show WYSIWYG editor on post page by default." on or off in Forum Profile -> Look and Layout settings?Firefox Text Encoding is set to Unicode? (can´t change my setting for some reason, FF 59, Win7)
New York's first Self-Driving Shuttle Service just began service! - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: August 08, 2019, 06:59:14 am
content: Optimus Ride is operating six autonomous shuttles on private roads in Brooklynhttps://www.theverge.com/2019/8/6/20755163/new-york-city-self-driving-shuttle-service
Pretty cool part - Converter IC that can work with up to 1kV input - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: August 06, 2019, 07:00:03 am
content: This is pretty cool:https://www.st.com/en/power-management/viper26k.htmlWith the built in power transistor it can be used to make a direct mains powered DC DC converter, or as a single-ish (if isolation is needed then some isolated feedback IC is needed) IC flyback converter or such.

author: krish2487
author_rank: Frequent Contributor
timestamp: August 06, 2019, 11:30:58 am
content: These type of solutions existed for a while now...Samsung had their samsung power switch lineup (which are now obsolete)Power integration,and ST of course..I m sure there are many many more players.. :-)

author: calexanian
author_rank: Super Contributor
timestamp: August 07, 2019, 10:33:44 pm
content: That would be handy for powering controls or other such things which don't require much power, but the thing is hooked up to 480 three phase. Large machine tools come to mind. I like the integrated switch and low external parts count. Unfortunately these make you life so easy type parts sometimes go obsolete as soon as they arrive. ST is generally pretty good about that, but you always have to keep it in mind.
Attention Melf fanboys - Page 1
Forum section: electronics / general

author: kentfielddude
author_rank: Contributor
timestamp: August 07, 2019, 05:08:53 am
content: Thought all the melf fans out their would like this video.https://youtu.be/cdNnEbfZ9us

author: FrankBuss
author_rank: Unknown
timestamp: August 07, 2019, 05:49:14 am
content: I don't think the resistance of thick film resistors is adjusted with a hammer and chisel, but otherwise an informative and funny video

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 07, 2019, 05:54:55 am
content: Bahaha, the computer scripted animations, the synthetic voice (some of which may actually be an actor reading a script), the Half Life stock sounds! Did they get a fanboi to produce this? It's pretty good as these things go.Tim

author: windsmurf
author_rank: Frequent Contributor
timestamp: August 07, 2019, 06:00:17 am
content: MELF FTW!

author: Domagoj T
author_rank: Frequent Contributor
timestamp: August 07, 2019, 06:05:40 am
content: I don't get it. Who is this aimed at? Content is for a niche audience, but style is for preschool children. I half expected a teletubbie to jump out and repeat everything two or three times, just to make sure we understood.

author: Brumby
author_rank: Unknown
timestamp: August 07, 2019, 06:11:58 am
content: Looks like click bait for Dave.

author: exe
author_rank: Unknown
timestamp: August 07, 2019, 06:33:40 am
content: I liked it. I shared this video with my non-EE friends, hope they can enjoy it as well. Hope to learn how to do such videos myself one day, but I suspect it's a lot of work.

author: FrankBuss
author_rank: Unknown
timestamp: August 07, 2019, 07:17:55 am
content: Quote from: exe on August 07, 2019, 06:33:40 amIt is actually not that much work with the right tools, for example Macromedia Flash and a tablet, if you can already draw:The lip sync is the most work, but they didn't do it very good in the Vishay video. The latest Blender 2.8 as a free alternative has some of the 2D things of Macromedia Flash now as well.

author: JPortici
author_rank: Super Contributor
timestamp: August 07, 2019, 07:23:53 am
content: Pure. Gold.

author: exe
author_rank: Unknown
timestamp: August 07, 2019, 08:27:34 am
content: Quote from: FrankBuss on August 07, 2019, 07:17:55 amI can't, but this shouldn't stop me, right?

author: FrankBuss
author_rank: Unknown
timestamp: August 07, 2019, 09:35:13 am
content: Quote from: exe on August 07, 2019, 08:27:34 amOne of my favorite channel uses stick figuresIn this video you can also see how he creates it:
RocketLab next Era live stream - Page 1
Forum section: electronics / general

author: hendorog
author_rank: Super Contributor
timestamp: August 06, 2019, 10:24:45 pm
content: Some interesting stuff in this vid. Scroll forward to find the start. Watching it now.

author: tautech
author_rank: Super Contributor
timestamp: August 06, 2019, 10:57:44 pm
content: Wow, reusable primary launch stage !

author: hendorog
author_rank: Super Contributor
timestamp: August 07, 2019, 12:14:41 am
content: Quote from: tautech on August 06, 2019, 10:57:44 pmAnd the method they are planning to use is very cool but pretty ambitious.

author: tautech
author_rank: Super Contributor
timestamp: August 07, 2019, 12:52:13 am
content: Quote from: hendorog on August 07, 2019, 12:14:41 amNah, Kiwis can do anything !Has me wondering though, if Peter Beck is to eat his hat just what garnish’s he will add to it for it to be palatable ?
frenchman crosses english channel on a jet powered hoverboard - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 04, 2019, 07:05:24 pm
content: https://edition.cnn.com/2019/08/04/europe/french-inventor-hoverboard-intl-scli/index.htmlgod my projects are whack

author: TheAmmoniacal
author_rank: Unknown
timestamp: August 04, 2019, 07:29:50 pm
content: Isn't this basically a jetpack that you stand on? That was invented in the 50s? Or was it 60s?Anyone know if the fuel is also hydrogen peroxide?

author: Domagoj T
author_rank: Frequent Contributor
timestamp: August 04, 2019, 07:42:09 pm
content: Video says kerosene, which is supported by the type of the engine - RC jet thing (timestamp 1:00 in the video).

author: raptor1956
author_rank: Frequent Contributor
timestamp: August 05, 2019, 06:51:23 pm
content: Given the high burn rate and small capacity using anything other than a high energy density fuel isn't wise. Additionally, pretty much all turbines are designed to use one form of kerosene of another. Many rockets use RP-1 for the first stage given the high energy density and the need for huge amount of energy -- H2 used in a hydrolox engine may offer higher ISP but at the cost of much greater storage volume requirements. The energy density in kerosene is enormous.Brian

author: continuo
author_rank: Frequent Contributor
timestamp: August 05, 2019, 09:09:41 pm
content: I don't know if it has any practical use but it looks super cool

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 05, 2019, 09:15:41 pm
content: Now he wants to release a flying car.https://www.digitaltrends.com/cars/franky-zapata-announce-250-mph-flying-car-with-70-mile-range/

author: windsmurf
author_rank: Frequent Contributor
timestamp: August 06, 2019, 11:42:55 pm
content: Quote from: SiliconWizard on August 05, 2019, 09:15:41 pmHere's another flying car under development:https://www.bloomberg.com/news/articles/2019-08-05/new-japanese-flying-car-gets-off-the-ground-for-about-a-minute
Apple watch S1 connector reverse engenieering project - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: August 06, 2019, 07:21:15 am
content: I got a big middle finger from apple today. A perfectly fine watch that is stuck on the apple logo. Apple had the watch, did all the checks etc... no physical damage. A software update bricked it. Now they want $450 to replace the watch.I found what could possibly be a solution. An adaptor that you can physically connect the watch to computer. That would be enough to hard upload a new firmware.So far the adaptor seems pretty straight forward. Apart from a label less IC.Anyone out there with one of these in had we could us to reverse engineer?Ps.: I really don't want to make this post an Apple watch troubleshooting post. It is about reverse engineering the adaptor.

author: amyk
author_rank: Super Contributor
timestamp: August 06, 2019, 11:49:49 am
content: That IC is almost certainly a microcontroller.There is a little bit of detail about protocol here:http://ramtin-amin.fr/tristar.htmlI suspect you are unlikely to find more info in English. Russian and Chinese sites may be of more help (if you can read the language, or use Google Translate...) --- the Chinese were the first to hack the protocol and make thirdparty ICs.
Forum Buggy, Anyone? - Page 1
Forum section: electronics / general

author: KL27x
author_rank: Super Contributor
timestamp: August 06, 2019, 03:31:32 am
content: Certain pages of the site are acting strange.When I move the mouse, all the clickable options are highlighted. And anywhere I click takes me to JLCPCB website, which happens to be the top banner on these pages.The main homepage of the forum is affected, as well as the page that opens when writing a post. Like right now. As I write this, when my mouse is over any part of the browser winder, every single emoticon gets lit up with a little underscore next to it. When I move the mouse off the page, these underscores disappear. Anywhere I click opens JLCPCB website. So I had to maneuver with tab and cursors to write and edit this post, then use keyboard shortcut to submit it.This is the only site which seems to be affected.

author: cs.dk
author_rank: Unknown
timestamp: August 06, 2019, 03:35:00 am
content: I noticed to.. Very annoying.

author: coppercone2
author_rank: Super Contributor
timestamp: August 06, 2019, 03:37:54 am
content: given how those fucking waffle makers spam the forum constantly, its probobly a ploy to sell PCBs. People should boycott (this is baboon advertizing) with ferric chlorideI can't figure out how it works though, makes me want a teletype (probobly some exploit with a 0 size image that over takes every clickable frame)

author: tautech
author_rank: Super Contributor
timestamp: August 06, 2019, 03:38:34 am
content: Reported for moderation:https://jlcpcb.com/v

author: Tom45
author_rank: Frequent Contributor
timestamp: August 06, 2019, 03:48:06 am
content: I see this too.Don't know if this means the forum software has been hacked, or this is a new ad revenue feature. If the latter, I suspect forum users will be leaving in droves.In any case there is now 0 chance that I would ever consider using JLCPCB.

author: Brumby
author_rank: Unknown
timestamp: August 06, 2019, 03:48:27 am
content: So it wasn't just me...!Very annoying - the whole reply box has become a clickable link to jlcpcb.com.

author: Brumby
author_rank: Unknown
timestamp: August 06, 2019, 03:50:36 am
content: Quote from: Tom45 on August 06, 2019, 03:48:06 amGee whiz ... pull out the gun before even knowing what's going on?

author: Brumby
author_rank: Unknown
timestamp: August 06, 2019, 03:51:11 am
content: Seems to have stopped....Can anyone else confirm?

author: Tom45
author_rank: Frequent Contributor
timestamp: August 06, 2019, 03:52:26 am
content: It's been fixed. An inadvertent oops apparently. Details in another thread.Edit to add link:https://www.eevblog.com/forum/chat/moderation-reports/425/

author: KL27x
author_rank: Super Contributor
timestamp: August 06, 2019, 04:56:09 am
content: ^ Fixed, yeah.For my part, hack did cross my mind. But when I noticed everything getting highlighted, I thought JLC link was probably incidental. JLC just happened to be the sponsor banner which I figured gets the first option/priority when "everything" gets clicked.And yeah, I wanted to make sure it was not just me picking up some virus.
A-10C Warthog Simulator -  Home Built - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 04, 2019, 10:49:24 pm
content: The Warthog Projecthttps://www.youtube.com/channel/UCJq3cq9N6xYF0fAvTgpwoBg/videos

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: August 04, 2019, 11:12:38 pm
content: Wow!I want one.

author: coppercone2
author_rank: Super Contributor
timestamp: August 04, 2019, 11:27:01 pm
content: it needs to burn smokeless powder under the seat when you fire, so it smells like the real oneI think that cannon makes so much gas it just ends up getting into the airplane (perhaps the forces of the cannon are so great the gaskets start developing gaps during the firing), or whatever