hybridfree/eevblog-posts huggingface dataset:
Bluetooth earbuds pinout help. - Page 1
Forum section: electronics / general

author: ktulu
author_rank: Regular Contributor
timestamp: March 16, 2023, 04:19:06 pm
content: Hi.I have a Philips TAT2206 earbud.I'd like to charge it without the charging case, (which I don't have) and without taking it apart.It has 2 small holes at the end, but I cannot figure out which is which.Does somebody have this or a similar model, and can help me out by measureing the 2 pogo pins inside the charger?I have tried applying 4-5V trough a 470 ohm resistor. It took around 8-10mA in one direction, and nothing in the other.Trough a 100 Ohm resistor it was 30mA, and when reversed the leads was 10mA but only while turned on.For a second I even tried connecting it directly, but the consumption jumped up to 80-90mA.I have to mention that the earbud is working. 70% charge left. (and was not rising even if I held the "charging" leads for several minutes)Thank you.

author: tom66
author_rank: Super Contributor
timestamp: March 16, 2023, 11:09:27 pm
content: For such an inexpensive and compact device it's reasonable to assume that the charging is done at 3.7V - 4.2V directly; in other words, the charging case handles the charging. So you would need a Li-Ion charger, you cannot use a voltage source and resistor. For such a small cell the chance of anything catastrophic happening is small, but the number one reason these types of earbuds fail is failure of the cell. 20-30mAh is pretty much typical for a cheaper earpod battery, which implies charging currents of around 20mA. I suspect based on your measurements you were in fact charging the battery, but you will need patience to see if this works.By the way, these small earpods are such an awful contributor to e-waste. With a typical life of 3 years and being essentially unrecyclable at end of life, I really wish they were never invented. (https://ig.ft.com/fixing-my-broken-wireless-earbuds/)

author: ktulu
author_rank: Regular Contributor
timestamp: March 18, 2023, 06:40:01 pm
content: Eventually I managed to charge it up.It was the "other way around"Only takes like 15-20mA at 5V, and has built in LiIon charging circuitry. The current drops after fully charged to 0. A couple of hours.Connections are, looking from the shaft-end with the earpiece facing down:left hole: -right hole: +middle-down tiny hole is the microphone.
Going from medior to senior hardware engineer  - Page 1
Forum section: electronics / general

author: becomingasenior
author_rank: Newbie
timestamp: March 07, 2023, 10:29:08 pm
content: I'm currently a medior (3/3 level) hardware engineer. I would like to push for the senior role, but that depends from company to company.What are some general things that I should work on as a medior to get to a senior position? The key is general here.What were some things that promoted you to senior?

author: rfclown
author_rank: Frequent Contributor
timestamp: March 07, 2023, 11:56:22 pm
content: Be good at what you do. Constantly educate yourself to expand your skills. The ideal projects on your day job allow you to expand your knowledge while benefitting the company. When that's not happening, do it on your own time/dime.

author: ebastler
author_rank: Super Contributor
timestamp: March 10, 2023, 04:57:18 pm
content: Have you talked to your manager about this, or to other managers (adjacent teams or next level up) in your current company? Ask for their guidance: What are they looking for in general in a "senior" role; which improvement areas do they see for you specifically?As you state, expectations will vary from company to company. Assuming that a promotion at your current workplace is one option to get to senior level, why not ask them about their expectations? Also, it can't hurt to make your boss aware of your ambition.

author: TomKatt
author_rank: Frequent Contributor
timestamp: March 10, 2023, 04:59:10 pm
content: OT - TIL that 'medior' is a wordI always get something out of the EEVblog

author: ebastler
author_rank: Super Contributor
timestamp: March 10, 2023, 05:02:40 pm
content: Quote from: TomKatt on March 10, 2023, 04:59:10 pmI would assume that (in this context) it qualifies as a word only in some rather large companies.EDIT: Having checked Google, it might also indicate that the OP is working in the Netherlands, where that term seems more common?
Bell Téléphone 147th anneverssery  - Page 1
Forum section: electronics / general

author: jonpaul
author_rank: Super Contributor
timestamp: March 10, 2023, 02:36:31 pm
content: A moment in telecommunications history10 March 1876, Alexandre Graham Bell succeeds in first working téléphone.Patent was filed a few days before. Thus the telephone is 147 years old.Bell had called his assistant in a nearby room.EnjoyJon

author: themadhippy
author_rank: Super Contributor
timestamp: March 10, 2023, 02:43:09 pm
content: Quoteand his second call,"good day your through to thomas edison,unfortunately im unable to take your call at the moment , please leave a message and i will will get back to you later "

author: TomKatt
author_rank: Frequent Contributor
timestamp: March 10, 2023, 03:45:50 pm
content: Quote from: themadhippy on March 10, 2023, 02:43:09 pmTrivia of the day - 'Alexander Graham Bell proposed ‘ahoy’ as a standard phone greeting before Thomas Edison popularised the use of ‘hello’, which has stuck up to today.'
Pixel phone scared of xenomorphs - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: March 05, 2023, 07:33:31 pm
content: https://news.slashdot.org/story/23/02/28/2229239/youtube-video-causes-pixel-phones-to-instantly-rebootMuch more interesting then the usual "can't divide by...."

author: TomKatt
author_rank: Frequent Contributor
timestamp: March 06, 2023, 02:20:04 pm
content: Everything is beta these days

author: Halcyon
author_rank: Unknown
timestamp: March 06, 2023, 10:14:00 pm
content: Looks like it's already been fixed with an update to Youtube. I tried it yesterday and it played fine on my Pixel 7.
Help understanding heat pipes parameters - Page 1
Forum section: electronics / general

author: moonz
author_rank: Contributor
timestamp: March 12, 2023, 02:00:34 pm
content: I need help understanding heat pipes parameters.Let's say I need to transfer heat from the heating component on the PCB to the heat sink. For this I want to use a heat pipe. To calculate the final temperature on the PCB component, I use thermal resistances. But there is no such parameter for heat pipes. They have Qmax.For example:https://www.mouser.com/pdfdocs/Heat-Pipes.pdfI don't understand what Qmax is and how to go from it to thermal resistance? It cannot be that the heat pipe transfers 60W without loss (as if the radiator is attached directly and not through the heat pipe).Help please me sort out this question.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: March 12, 2023, 06:22:12 pm
content: Check the PDF documents on this page:https://www.qats.com/Products/Heat-Pipes-Vapor-Chambers/Heat-Pipes
Voice of the Cylons - Battlestar Galactica 1978 - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: March 05, 2023, 02:48:49 pm
content: Interesting history and demos of the original equipment used for BSG in 1978.Unfortunately it is all in shorter videos, still very interesting.1)2)3)4)5)6)7)

author: coppercone2
author_rank: Super Contributor
timestamp: March 05, 2023, 07:31:28 pm
content: I was just playing with the repaired wavetek 395 and the modulation methods, and I noticed you can make cool tones by setting RF modulation with audible frequencies as the carrier.I think the Alien movies might have done something like this too IIRC, where they modified animal noises with analog electronics.

author: Haenk
author_rank: Super Contributor
timestamp: March 06, 2023, 12:02:20 pm
content: (On a totally unrelated sidenote, I can still kick myself I didn't buy that original Kraftwerk Vocoder, AFAIR it was only 2000,- DM on ebay back then :/ )
How does this circuit work/single phase gate motor pcb board - Page 1
Forum section: electronics / general

author: WiredSmart
author_rank: Contributor
timestamp: March 05, 2023, 07:32:14 am
content: I stripped down a gate motor and found this chip/circuit board between a cog that was driven by shaft. I suspect the chip has something to do with either counting the revolutions of the motor or the distance the gate travels . The circuit itself appears simple but could someone provide a better explanation of how the chip electronics actually works when the cog turns .

author: ataradov
author_rank: Super Contributor
timestamp: March 05, 2023, 08:06:41 am
content: This is photo interrupter. Just a pair of IR LED and a photodiode/phototransistor. There is no logic here, both LED and the photodiode just go to the connector.LED is constantly on and the beam interruption by the shutter may be detected by the diode.Here is explanationhttps://www.rohm.com/electronics-basics/photointerrupters/what-is-a-photointerrupter
3D configurator for website - Page 1
Forum section: electronics / general

author: reyntjensm
author_rank: Regular Contributor
timestamp: March 13, 2023, 10:17:31 pm
content: I'm an electronics guy and got a project to design a website.So i'm not planning to do all the work on my own but i'm interested in the technology.I would like to build a 3D web configurator. The 3D STL files are loaded from a server and the user should be able to choose several files and move them around in the web browser. I know this is a rather complex thing to do. I have found a companyhttps://www.perspectix.com/en/px_webconfiguratorworking on this technology but i was wondering if there are (open source) alternatives available?
Need a 10nm XYZ measurement, the INSANE Precision of The NIST - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: March 04, 2023, 03:21:23 pm
content: The INSANE Precision of The National Institute of Standards and TechnologyJust look at the size/area of that measurement table. Any object within can be measured down to every ~10nm. It is so precise that just a 1/1000th of a degree change in room temperature will throw off your measurement. Even ambient light will effect the final results.
Smith chart history - Page 1
Forum section: electronics / general

author: cleanworkbench
author_rank: Regular Contributor
timestamp: March 02, 2023, 07:24:45 am
content: Ive been looking for a good historical documentary on the history of the Smith chart from Bell labs and cannot find anything , does one even exist with its inventor Phillip H Smith giving an explanation .Theres docos out there from AT & T and Fairchild but cant find anything on The development of the Smith chart.

author: AlbertL
author_rank: Regular Contributor
timestamp: March 03, 2023, 03:24:51 pm
content: The References listed in this Wikipedia article include journal articles by Smith himself, as well as by Mizuhashi Tosaku who is credited with developing the concept independently:https://en.wikipedia.org/wiki/Smith_chart
Solve the Mystery blue diode  - Page 1
Forum section: electronics / general

author: WiredSmart
author_rank: Contributor
timestamp: March 03, 2023, 06:42:44 am
content: I am a novice to electronics and i was experimenting with x2 multimeters and a few diodes. The meters I used was a Fluke 117 and a Kaiweets HT206 Clamp meter (both meters i love, so I have no prejudice between either)A good friend of mine was showing me how to test diodes using a multimeter when we discovered something odd on a blue led. When testing with the Fluke 117 on diode mode, the diode light0 emits, but it displays O.L ? When testing with the Kaiweets clamp meter the opposite happens on diode setting, the led emits but it displays a forward voltage reading and not a O.L reading.I've ran the test with other leds of different colours but somehow the blue colour led does not show a reading on diode mode with the Fluke 11760.Could someone please help me understand why this is . Im looking forward to somone solving this mystery. 0

author: Swainster
author_rank: Frequent Contributor
timestamp: March 03, 2023, 06:50:29 am
content: In the Fluke 117 user manual, it states that diode check will display OL when the measured voltage goes above 2V. This is a choice that fluke made - perhaps to reduce confusion when measuring stuff in-circuit i.e. when other components may be in parallel with the diode under test. It's just something you need to be aware of when using different multimeters (not all work exactly the same way)

author: WiredSmart
author_rank: Contributor
timestamp: March 03, 2023, 06:57:52 am
content: Thanks champ...LEGEND
Power adapter "connector" name? - Page 1
Forum section: electronics / general

author: urban
author_rank: Newbie
timestamp: March 04, 2023, 02:37:42 pm
content: Hello,I'm looking for something likehttps://www.voltacharger.com/products/giga-extension-adapter?variant=44108821692728,is there any name for that kind of connector for US foldable plug? Is it possible to get only connector to the charger side? Is there any other brand doing such a cord?It's used on all kind of brands like volta above, unitek (https://www.mbreviews.com/wp-content/uploads/2022/05/unitek-66w-gan-charger-1.jpgandhttps://www.mbreviews.com/wp-content/uploads/2022/05/unitek-66w-gan-charger-2.jpg), hyperjuice (https://zitseng.com/uploads/2020/03/DSC04132-1536x1024.jpg) and others.Got plenty of those chargers and sometimes it's useful to plug it over extension cord than directly to the wall.

author: EPAIII
author_rank: Super Contributor
timestamp: March 07, 2023, 06:22:19 am
content: How can you ever do any business with that web site. Things keep popping up. There is no end to that.I would not do even $0.02 worth of business with them. They don't want it. If they did, they would have a decent web site.As far as I can see, that is nothing but a straight power cord, with standard connectors on both ends. You need to look at electric/electronic catalogs to find the connectors. But I suspect that you would wind up paying as much or more that way because the price I saw under the pop-ups was quite reasonable.

author: tooki
author_rank: Super Contributor
timestamp: March 07, 2023, 06:40:46 pm
content: EPAIII, I think you need to take a closer look at the cord in question. OP is after the special socket that snaps onto thefolded inUS plug on a wall wart. That is anything but a “standard connector”. They’re not asking about the standard AC plug that goes into the wall.As for the websites: OP isn’t asking about buying on those sites. It’s just where they found examples of the type of cord they want. Not that I see any issues with pop ups as you describe.
Angle Gradient for DIY Encoder  - Page 1
Forum section: electronics / general

author: eTobey
author_rank: Super Contributor
timestamp: February 26, 2023, 01:55:55 pm
content: Hi,i would like to build an encoder, but i cant generate an useful printing pattern for it.I tried Photoshop, but it limits steps to only 1%. Also i tried using CSS (HTML), but this yields not exact gradients.I can not use an encoder, that uses a disc and puts light through it, i need to use reflection. On that one picture with the thin green lines, you can see the ring, where the print should go.See also:https://botscene.net/2012/10/18/make-a-low-cost-absolute-encoder/

author: eTobey
author_rank: Super Contributor
timestamp: February 26, 2023, 07:01:54 pm
content: Figured it out by myself:One lucky google find, a few hours and some tweaking: The solution is gnuplot...Code:set pm3d mapunset key# plot the heatmapset parametricset isosamples 5000unset borderunset xticsunset yticsunset colorboxset angles degreer = 6set urange[0:r] # radiusset vrange[0:360] # angleset xrange[-r:r]set yrange[-r:r]set size ratio 1set palette grayset terminal gif size 3000,3000set output 'output9.gif'splot u*cos(v), u*sin(v), sin(v*21)

author: eliocor
author_rank: Unknown
timestamp: February 26, 2023, 08:10:18 pm
content: maybe you can use HTML...Here is an example (15 degrees/step):Open file with a browser (remove '.txt' extension)Code:<!DOCTYPE html><html><head><style>#grad1 {height: 1000px;width: 1000px;background-color: red; /* For browsers that do not support gradients */background-image: conic-gradient(black 0deg, white 15deg, black 30deg, white 45deg, black 60deg, white 75deg,black 90deg, white 105deg, black 120deg, white 135deg, black 150deg, white 165deg,black 180deg, white 195deg, black 210deg, white 225deg, black 240deg, white 255deg,black 270deg, white 285deg, black 300deg, white 315deg, black 330deg, white 345deg,black 360deg);}</style></head><body><h1>Conic Gradient - 15 degrees for each color</h1><div id="grad1"></div></body></html>

author: eTobey
author_rank: Super Contributor
timestamp: February 28, 2023, 07:42:21 am
content: I already wrote, that i used CSS. It is not relialable.

author: eliocor
author_rank: Unknown
timestamp: February 28, 2023, 08:42:16 am
content: just by curiosity:what kind of printer technology do you use to appreciate the difference?

author: eTobey
author_rank: Super Contributor
timestamp: February 28, 2023, 05:21:05 pm
content: I just tried printing those today. My printer is really not useable for this. Lines when printing with black ink... No lines with mixing the other colors to black, but this has itself some issues.I think i should go straight to some fancy plasma deposition technique...
Simply… LMAO - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: February 28, 2023, 04:52:38 am
content: 😂

author: MrMobodies
author_rank: Super Contributor
timestamp: February 28, 2023, 05:01:12 am
content: Lots of wind on the beach and a little sandstorm.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 28, 2023, 06:23:28 am
content: Yeah this airport is insanely close to the beach. Takes some skills too to make a safe landing, especially with a 747.

author: Bud
author_rank: Super Contributor
timestamp: February 28, 2023, 07:17:56 am
content: There is a Gazillion of these "technical" videos on youtube and user eti has a lot of spare time on hand to continue spamming the forum.

author: eti
author_rank: Super Contributor
timestamp: February 28, 2023, 09:49:10 am
content: Quote from: Bud on February 28, 2023, 07:17:56 amYou seem to have plenty of free time to reply to topics you deem “beneath you” 🤪I know you’re desperate to gain peer approval from the miseries on here - go for it if you assume it gets you somewhere. Misery loves company - you have plenty here 😂Cheer up grumpy. It’s just some fun.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 28, 2023, 11:45:39 am
content: Well enjoy these idiots then.How not to cut a tree

author: paulca
author_rank: Super Contributor
timestamp: February 28, 2023, 12:03:23 pm
content: Used to have a lot of fun in Flight Simulator 2004 flying jets in and out of there and other "notoriously dangerous airports". It was a thing. It's easy until you throw in a 600ft ceiling and a 25 knot cross wind.Others include the island of Madeira which has a mountain at the end of the runway and half the runway is on stilts off the edge of a cliff. The threshold ramp is a wall. The approach path follows a tight banking turn following a set of rabbit lights in the sea, brings you within a few hundred meters of peoples houses on the mountain side and you only straight up about 1nm from the touchdown. In reality I believe it's a CAVOK approach unless in emergencies. Some good videos on YT.There is the one in the virgin islands which has a hill before the runway which is exactly the steepness of the glide slope, so planes cross the ridge at about 10 feet.My favourite was KaiTak! The old HongKong airport. Flying in an old 1970s 747 in the soup looking out through the clouds for the chequered marker board that tells you to either turn or die. Then swooping down, practically through the buildings to land while barely enough time to straighten up.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: February 28, 2023, 12:21:17 pm
content: https://www.youtube.com/shorts/xkO3S57IPvw
Can anyone find on google the LTSPICE parts list? - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: February 28, 2023, 08:53:16 am
content: All I want to find is a list, the list of the parts, as in the components, that are in the LTSpice default library. And I can't find it. I've tried looking uplist of components in ltspicelist of parts in ltspiceltspice component library listand a few moreand I can't find the list of parts, in plain English, or any kind of a list, on one page, and certainly not the default list of parts. I can't really find it at all. Why is it so hard to find ? I get links to guides, and thishttps://www.eevblog.com/forum/beginners/ltspice-parts-lists/
PCB Diagnostics Book - Page 1
Forum section: electronics / general

author: Singapura
author_rank: Regular Contributor
timestamp: March 01, 2023, 03:46:20 am
content: Hi EveryoneI'm happy to announce that my sixth engineering book, PCB Diagnostics, has been released.You can check it out at:https://www.amazon.com/dp/B0BW2BSZVFWishing you good health and peace of mind in these uncertain times!Blogsite:https://visio-for-engineers.blogspot.com/

author: EEVblog
author_rank: Unknown
timestamp: March 01, 2023, 04:41:52 am
content: Moved to General because it's not really a Buy/Sell section thing.

author: David Aurora
author_rank: Frequent Contributor
timestamp: March 01, 2023, 05:38:52 am
content: I'm always keen to check out books like this, is there a table of contents or sample chapters or anything around to take a look at before buying?

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 01, 2023, 08:55:48 pm
content: . . .Will be buying my copy as soon as funds permit!I have one suggestion tho' – could you make the original colour images used to produce your books available to previous purchasers please ? – (e.g. password on submitting order receipts) – older people like myself sometimes having difficulty in picking out fine detail on grey–scale printed images!Chris Williams
The offline week experiment - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 28, 2023, 01:15:43 pm
content: Been in an Internet blackout experiment for about 7+ days.No phone, no TV or radio either. Electronics yes, computers yes.Been a very interesting experiment. Saying this as a dude that lived a couple of decades before the Internet and mobiles era. Highly recommended experiment.From a pragmatic point of view, been surprised how many programs complained for not being able to go online!Arduino IDE, for example, only complained, while VScode python addon simply didn't start, had to use IDLE. All this activation and/or phone home trends is a plague even for free and open source software.Then, you'll find a strange feeling of not heaving online search and/or downloads available at your fingertips. Partially been saved by the personal library. Similar strangeness came from the lack of live content, being it the lack of social media or the lack of live AV streaming. When you are offline, playing a recorded movie or album is not the same as playing the same thing from the Internet.Regarding programs docs, many don't install more than a man page by default. However, for those who have offline docs, reading the manuals proved way faster in getting things done than searching online. That, you have to use what ever you happen to have offline, either books or software.Overall an interesting, fun, and sometimes challenging experience, try it if you can get yourself an isolation week.

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 28, 2023, 01:24:15 pm
content: In my mind, access to the interwebs and social media are different things. When I hear about 'internet fasting' or similar, I tend to associate that with social media. I've got no problem with the former, and despise the latter.Other than a very small handful of forums, I have absolutely no social media presence. Never had a Facebook, Twitter, Snapchat, TikTok or whatever else the kids are doing these days. I've got better things to do and I'm not interesting enough to bother following. It amazes me that people get so hung up on what everyone else thinks.Recently I missed a medical note because all my providers use some kind of app messaging thing. You'd think they'd call, write a letter or at least email - but nope, everything is communicated through an app. It's nutty to me.

author: Addryn
author_rank: Newbie
timestamp: March 02, 2023, 05:43:05 am
content: I think that sometimes all of us should have this isolation week for mental health
Recommended yt videos cover Optical Computing - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: February 27, 2023, 02:32:31 am
content: I've spent a bit of time, and here is results; these two videos are clear and medium length.1.) Intro to Photonicsby NPTEL- NOC. 41 minutes2.). Photonic IC'sby Photonics Research (Belgium)53 minutes
O.T.  Machining a 0.6 mm Screw - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: February 19, 2023, 01:52:41 pm
content: Machining some pretty small parts.

author: coppercone2
author_rank: Super Contributor
timestamp: February 19, 2023, 08:57:11 pm
content: I hate those parts ever since I broke a micrometer that rusted. I always wanna pay a lego man whenever there is something like that. It was some soviet crap

author: PartialDischarge
author_rank: Super Contributor
timestamp: February 19, 2023, 09:32:53 pm
content: The tools and methods used by watchmakers are pretty interesting. Some machines like for engraving were made 80 years ago and are still in use

author: MarkS
author_rank: Unknown
timestamp: February 19, 2023, 09:46:53 pm
content: I'd love to see what would be possible with an atomically accurate and precise 3D printer with atomic resolution... 3 nm screws, anyone?

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 21, 2023, 11:35:11 am
content: Ever tried to repair a modern smart phone? I think they have those watch parts manufacturers for suppliers. My hands aren't steady enough for fasteners smaller than a grain of rice these days...

author: EPAIII
author_rank: Super Contributor
timestamp: February 25, 2023, 08:22:56 am
content: But, but, BUT,you cheated. You used a die. Which begs the question, how do you make the die.I assume you don't single point a 0.6 mm die. The tool would need to be around 0.3mm wide, no more. So it must be made with a tap.And then we are right back to where we started,How do you make a 0.6 mm external thread from scratch? I would guess it would have to be single point threaded like any other unique thread. Except it is more difficult because the tap will need to be at least several times as long as that real short screw you made in the video. So it will need to be supported while threading it. No flexing allowed. Bottom support? Rear support? How? How? HOW?Thread rolling perhaps? Two rolls with thin supports above and below. That might work.So lets see that Mr. smartypants!

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: February 25, 2023, 07:20:38 pm
content: You just need to use a support that travels with the tool.Even a chunk of wood screwed into your carriage would do.I'm pretty sure that Joe Pie has one or more videos about that.

author: jpanhalt
author_rank: Super Contributor
timestamp: February 25, 2023, 07:25:09 pm
content: Quote from: EPAIII on February 25, 2023, 08:22:56 amEDM? It can do pretty fine detail with hard steel.Of course, I believe watchmakers had those dies long before EDM became common.

author: coppercone2
author_rank: Super Contributor
timestamp: February 25, 2023, 08:58:59 pm
content: I suspect the swiss used to make these by hands with a file some how.
What switch is this? - Page 1
Forum section: electronics / general

author: glhunter0318
author_rank: Newbie
timestamp: February 26, 2023, 01:13:48 pm
content: Hey folks,A kick pedal on my kids Alesis drum set isn't working correctly -- it's being triggered twice when it should just be once. I took the pedal apart and it has this blue & white switch inside (blue is just a cover to the body, the white lever rocks to trigger the switch). Looks easy enough to replace, but I have no idea what kind it is. Does anyone out there know? Thanks.

author: xrunner
author_rank: Super Contributor
timestamp: February 26, 2023, 01:20:37 pm
content: I wonder if the plastic parts are just a lever assembly that is on top of a more common switch. I'd try to remove the plastic parts and see what under it.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 26, 2023, 01:45:08 pm
content: Have you considered gluing a magnet to the top part and mounting a reed switch in the bottom part? Would be sealed so should be more reliable.

author: kolbep
author_rank: Frequent Contributor
timestamp: February 26, 2023, 01:48:49 pm
content: Seen them used in Telephones, and Intercom Handsets as the Hookswitch (that activates when you hang the receiver up),Something like:https://www.amazon.co.uk/15pcs-Telephone-Spare-Parts-Switch/dp/B01EZPNEQMandhttps://www.alibaba.com/product-detail/micro-hook-switch-witch-blue-white_1600199795387.html

author: glhunter0318
author_rank: Newbie
timestamp: February 26, 2023, 01:53:01 pm
content: It is just a cover and lever assy. Beneath the blue is a set of springs that connect to the lever that ultimately trip the switch.

author: glhunter0318
author_rank: Newbie
timestamp: February 26, 2023, 01:58:10 pm
content: Wow, that certainly does look like it! Thank you!

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 26, 2023, 08:24:25 pm
content: Yes, it pretty much looks like those hook switches.Aliexpress has some pretty cheap ones:https://www.aliexpress.com/item/4000022638257.html(Unscrew the small board and check the pinout.)

author: eti
author_rank: Super Contributor
timestamp: February 27, 2023, 12:51:20 am
content: These used to be used in POTS telephone hookswitch mechanisms - I saw these loads of times in the 90s. A sprung "pedal" actuator on a pivot.
The Future of Antennas and RF Lenses  - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: February 22, 2023, 06:50:14 pm
content: Interesting one on new antenna designs and 3D printing of antennas.

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: February 24, 2023, 08:07:48 am
content: I think to some extents not just advances in 3D printing, but in the quality of metal plating on polymers is allowing for huge jumps in what is possible. Huber&Suhner have a process that involves molding thermopolymers to high precision with lots of cavities/slots/etc and then using a propriatary process to metal plate them to build very high performance millimeter-wave structures like waveguides for cents instead of hunderds of dollars. Already used in mass production for automotive radar.
On line buying woes and crap web shops / sites - Page 1
Forum section: electronics / general

author: cleanworkbench
author_rank: Regular Contributor
timestamp: February 25, 2023, 01:47:26 pm
content: I,m not a web designer just a web user and am struggling to understand what the problem is with some company's / businesses that show a basket and its really in- active , the store is just an on line catalog for their wares and to buy a product from them you have to send emails about what you want and fill out pro forma, just defeats the object of an online site with a basket icon.Case in point Spain and Portugal, pretty poor, is it a problem with the choice of web creation platform / web designer person and they're interpretation of what a site should be capable of, have they ever seen a good web site with an on-line shop ?.!.Does the ideology of web page design with an on-line shop vary from country to country.

author: Jackster
author_rank: Frequent Contributor
timestamp: February 25, 2023, 03:56:13 pm
content: This is common for companies stuck in the early dot com days before online payments where a thing. Typically their IT department is made up of old guys 😅Number of suppliers in the UK do the same thing. Though this is more to do with getting your contact details to sell you more than what you want.

author: cleanworkbench
author_rank: Regular Contributor
timestamp: February 25, 2023, 05:15:47 pm
content: Well thats one reason theyre must be more . Doesn't do much for their sales nor reputation , i,ve lost count of the amount sites that have pissd me off , will they ever learn .In Spain they even list their bushiness in the on line yellow pages with just a phone number and address , 40 years behind cant make it out ?!

author: Sighound36
author_rank: Frequent Contributor
timestamp: February 28, 2023, 03:41:37 pm
content: The other thing which really bugs me any online cart shop or retailer MUST have a contact number by UK law not just an email address or AI chat bot. Rather than having to wait a number of days before getting an email ping pong trail to startWhat happend to just making a call talking to someone who knew how to deal with your and take a card payment, pogress eh?

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 28, 2023, 03:46:33 pm
content: Quote from: Sighound36 on February 28, 2023, 03:41:37 pmA poorly designed automated system is cheaper than a human staffed position every day of the week.The company I work for is a manufacturer in a rather competitive market. Our sales and support teams have allowed us to carve a niche market for those willing to pay the marginal premium for customers who value those services. I believe this also leads to greater customer satisfaction, which in turn lowers complaints and returns.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 28, 2023, 11:40:01 pm
content: I remember how the Fry's web site was very badly designed. Not surprised they went out of business.
Matt / Antireflection foil for screen do you have any experience? - Page 1
Forum section: electronics / general

author: Miyuki
author_rank: Frequent Contributor
timestamp: February 23, 2023, 10:51:35 am
content: Hi folks.I want to ask if anybody here has experience with some of the matt antireflection foils for screens. Because that plague of shiny mirror-like ones is backI'm considering getting one fromhttps://anti-glare.co.uk/for my new 55" screen Im using as a PC monitorI am cautious because it was not cheap and I do not want to ruin it

author: tom66
author_rank: Super Contributor
timestamp: February 23, 2023, 11:59:47 am
content: How do you avoid bubbles on the screen? It is hard enough to apply a screen protector to a phone without getting a bubble or two, I cannot imagine trying to do that on a 55" screen perfectly.

author: Miyuki
author_rank: Frequent Contributor
timestamp: February 23, 2023, 12:08:51 pm
content: Quote from: tom66 on February 23, 2023, 11:59:47 amI'll probably let it installed by some shop doing windows, they do it on even bigger areas

author: jonpaul
author_rank: Super Contributor
timestamp: February 23, 2023, 02:05:04 pm
content: We used Lenovo ThinkPad Carbon X1, and LG 38" or Samsung 30" curved monitors.no issues of glare or reflection.Suggest a you adjust the room lights to avoid glareWe found out that films and AR glass is uselessOur best solution, buy a curved monitor and check reviews of glare before you purchase a monitor or laptopbon chanceJon
Stopping Computer Companies from Lying | Asia's PC Test Equipment Megafactory - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: February 20, 2023, 05:13:04 am
content: https://youtu.be/B7dwAPsg6IsTons of test equipment and their users mainly for cooling testing and inspection (X-ray).

author: thm_w
author_rank: Super Contributor
timestamp: February 21, 2023, 11:41:44 pm
content: Yeah this was a good vid if you are into thermal/flow test equipment, the crazy thing is it sounds like its the one old guy designing all of this stuff?
For "PUSH BUTTONS" aficionados only ... - Page 1
Forum section: electronics / general

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 13, 2023, 07:10:45 pm
content: I have to admit - I just love a good switch or buttonIt's amazing how much work goes into those - although elevator buttons have historically been more advanced than they might seem... I always thought those old buttons had neon lights behind them, but it turns out the neon switching is integral to it's operation...http://lampes-et-tubes.info/rs/rs041.php?l=eStill, one of my favorite button switches are the old square illuminated ones...

author: Halcyon
author_rank: Unknown
timestamp: February 14, 2023, 12:05:26 am
content: My favourite switches to-date are the illuminated switches used in audio and video broadcast equipment.(Sorry for the crap stock image)

author: eti
author_rank: Super Contributor
timestamp: February 16, 2023, 09:06:11 am
content: Here’s some REAL switches; you can keep those other toys:

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 16, 2023, 11:48:59 am
content: It's always amazed me that we got to those NASA level switches without all the old engineers being killed by exposed knife switches... I can't imaging grabbing the handle of some monster 3 phase power circuit that is inches away from basically a bus bar...

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 17, 2023, 04:32:00 pm
content: Aren't touchscreens the scifi of pushbuttons?

author: AlbertL
author_rank: Regular Contributor
timestamp: February 17, 2023, 05:42:50 pm
content: Quote from: eti on February 16, 2023, 09:06:11 amYes, those Master Specialties pushbuttons were fantastic. It's a shame they're not still made. You might be able to emulate them fairly well with these:https://www.nkkswitches.com/smartdisplay/#gref
Big Clive and seriously dangerous eBay product - Page 1
Forum section: electronics / general

author: IanB
author_rank: Super Contributor
timestamp: February 14, 2023, 07:41:37 pm
content: This was morbidly entertaining:Quote

author: tom66
author_rank: Super Contributor
timestamp: February 14, 2023, 07:52:57 pm
content: Very impressive. I kinda wanted to watch him plug it in outdoors to see how long it took to totally destroy itself. But scary to think that could burn someone's home down very easily (not to mention the electrocution risk).These eBay importers will continue to import dangerous crap as long as there are not prosecutions for doing it. Trading Standards in this country is a toothless joke.

author: Alti
author_rank: Frequent Contributor
timestamp: February 14, 2023, 11:51:22 pm
content: Quote from: tom66 on February 14, 2023, 07:52:57 pmIf you buy something from Asia, via eBay or not via eBay, it is you who are an importer.I hope this won't change.I like crap, bigclivedotcom likes crap."Air purifier", I have not seen this particular model inSafety Gate(Rapex) database so maybe UK does not use the database after brexit? It is unlikely this model is imported by some company and distributed inside of EU because it would have been reported and forced out of market (at a cost of importer). I only foundthisair purifier sold through Amazon, imported by UK company. It is recent stuff, 12/2022. We shall see.EDIT: Some randomrecalls pagefrom UK (found via Rapex) with various dangerous products.

author: nctnico
author_rank: Super Contributor
timestamp: February 15, 2023, 10:07:50 pm
content: In the past I've seen TV sets made by A brands catch fire all by themselves. Nothing out of the ordinary. Just make sure you install smoke alarms in your home. I have.And I like crap from Aliexpress and Ebay as well. At least there is no local seller markup and you can always throw the bits away that are dangerous. I have LED panels from Aliexpress in my bathroom ceiling. But I made the (dimming) power supply myself.
Portfolio - Page 1
Forum section: electronics / general

author: mrburnzie
author_rank: Regular Contributor
timestamp: February 23, 2023, 05:30:10 pm
content: Hi,most of us here have a portfolio with projects we have done either for freelance clients, companies we worked at or other. Most projects and companies require an NDA to be signed.How do you populate your portfolio that are under NDA or some other policy?Blink once if you just show it, without any regard for the NDAs

author: Miyuki
author_rank: Frequent Contributor
timestamp: February 23, 2023, 05:33:43 pm
content: Most companies have not just NDA but also marketing materials. So you can just point to that. And tell, I did power supply for this or wireless communication for that.
MLC3700A N5FBUN (msc-logic ARM) any info  - Page 1
Forum section: electronics / general

author: fable
author_rank: Regular Contributor
timestamp: February 12, 2023, 10:27:41 pm
content: Hi, i have device with damaged MLC3700A "N5FBUN" . I found mlc3700a"N5FH1M" but i dnt know if there is a difference?

author: ataradov
author_rank: Super Contributor
timestamp: February 12, 2023, 10:44:18 pm
content: This is likely a manufacturing lot code and does not matter to the functionality. But if it is a programmable device, then you would need a way to get the firmware and a programmer. There seems to be no obvious documentation.

author: amyk
author_rank: Super Contributor
timestamp: February 13, 2023, 02:22:55 pm
content: That's just lot/date code.Looking at theveryminimal information I could find, it doesn't appear to need programming:http://www.mcslogic.com/sub2_DigitalAudio_MLC3700.htm
Gofundme to save GE 3 million volt test lab - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 07, 2023, 01:55:39 pm
content: https://www.gofundme.com/f/Saving-GE-Lightning-Laboratory

author: HighVoltage
author_rank: Super Contributor
timestamp: February 07, 2023, 03:41:36 pm
content: It is one thing to destroy the building.But why destroying the library and its content as well?This could be scanned for future generations.

author: temperance
author_rank: Super Contributor
timestamp: February 07, 2023, 04:34:18 pm
content: Can't we cal the American Pickers or something and have them pay top dollars for some real stuff instead of old oil cans? There is only one problem. The generator at stake is not contained in it's original package.

author: langwadt
author_rank: Super Contributor
timestamp: February 07, 2023, 08:11:24 pm
content: why isn't GE throwing a bit of money after this? $7500 is about 100ppb of they annual revenue

author: SeanB
author_rank: Super Contributor
timestamp: February 07, 2023, 09:15:16 pm
content: Quote from: langwadt on February 07, 2023, 08:11:24 pmBecause it does not lead to exec bonuses, and them being able to flip a chunk of the property for personal profit.

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 13, 2023, 04:41:00 pm
content: Quote from: langwadt on February 07, 2023, 08:11:24 pmIsn't GE descendant from Edison?Maybe AC current is still a sore subject with someone there...
SATA optical caddy frustrations FIXED! - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: February 10, 2023, 12:45:14 am
content: Hi. I thought I'd share a tip that not everyone will know. Around a year ago I bought an optical bay SSD caddy - a cheap one - for my HP ProBook 6460b, so I can use a second SSD. Now, nowhere AT ALL in the packaging did it mention needing to flick a switch, and the switch is barely visible, even so. This switch changes compatibility for different laptop brands... apparently... and there are different switched (some 2 pos, some 3 pos) on different caddies.Anyway, here is the switch in mine - I didn't know it existed until I took the caddy apart! The black plastic and a dark recessed switch made it nigh-on INVISIBLE.Here's the TINY brand compatibility switch (far left) that's mentioned nowhere - had to slide it down (opposite of what's pictured) and the caddy works flawlessly now. Before I did this, NOTHING Microsoft would shutdown or reboot - it would just freeze, and I was about to give up, and then my brain said "take the caddy apart and have a look"Here's a video I found, too:... and another:
How to design a “High-voltage, low-speed digital output driver”? - Page 1
Forum section: electronics / general

author: desert
author_rank: Contributor
timestamp: February 06, 2023, 12:40:03 pm
content: “High-voltage, low-speed digital output driver” basic specifications:Voltage level range: -60V~+60VMaximum voltage swing: 30VMaximum voltage slew rate: 70V/usDriver current: 45mAMaximum output data rate: 5Mbps@5V swing; 2.5Mbps@10V swing; 1Mbps@20V swing; 200Kbps@30V swingMinimum pulsed width: 200ns@5V swing; 400ns@10V swing; 1us@20V swing; 4.5us@30V swingMy problem is that: pin driver (for example EL7156) can not meet voltage range and voltage swing requirement; high-performance OPA (LTC6090) can not meet slew rate and data rate requirement.Any suggestions on solution and key components? Thanks.

author: David Hess
author_rank: Super Contributor
timestamp: February 07, 2023, 01:41:28 am
content: 70 volts/microsecond is not particularly demanding, and the high voltage output means that an operational amplifier can operate with a minimum stable gain, so for simplicity I might use an operational amplifier with a separate fast fixed gain output stage. The fixed gain of the output stage multiplies the slew rate of the operational amplifier.

author: jonpaul
author_rank: Super Contributor
timestamp: February 07, 2023, 09:20:16 am
content: load? R/L/C?

author: Marco
author_rank: Super Contributor
timestamp: February 07, 2023, 11:02:31 am
content: High speed half bridge driver, maybe use an actual isolated power supply between the switch node and the bootstrap instead of relying on the bootstrap diode, so it can support extreme duty cycles.PS. guess you'll need a level shifter too since the half bridge driver will be using negative rail as its ground and the input will presumably be referenced to 0V, but ehh how hard can it be?
HDMI Powered Audio Extractor Bluetooth Transmitter - Page 1
Forum section: electronics / general

author: dellsam34
author_rank: Regular Contributor
timestamp: February 05, 2023, 09:26:12 pm
content: This is probably a pipe dream but I need to monitor audio from a HDMI out using my Sony Bluetooth headphones, Is there really a compact size HDMI audio extractor built in audio Bluetooth transmitter that plugs into a HDMI output socket and get powered by it? I've seen bigger HDMI audio extractors that require a separate power source and a HDMI cable, but my quest is to find one like in the attached illustration (taken from a video transmitter stock image) that can be plugged in and powered by the HDMI connector's 5V pin?

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 06, 2023, 04:38:48 am
content: You could cobble one together out of a cheap HDMI to VGA+audio adapter and a Bluetooth audio transmitter module.

author: dellsam34
author_rank: Regular Contributor
timestamp: February 06, 2023, 08:36:39 am
content: I guess it could be made from DIY PCB kits, I know there are HDMI to SPDIF audio extractors tiny PCB's and there are SPDIF Bluetooth transmitters tiny PCBs, It's just a matter of connecting both SPDIF ends together and have them both powered from the HDMI 5V pin which can handles up to 300mA, The casing can be 3D printed at home. It's worth investigating.