hybridfree/eevblog-posts huggingface dataset:
rocker switch, dpdt, mom-off-mom, 15x21mm series ?  - Page 1
Forum section: electronics / general

author: nipil
author_rank: Contributor
timestamp: April 26, 2023, 09:51:09 pm
content: HelloI'm looking for a 15x21mm dpdt rocker switch of the mom-off-mom type, and i found only one reference on digikey (GRS-4023C)As i am really surprised i haven't found another available reference, i call for help.Some additionnal info : The size contraint is important as i have to fit quite a few of them in a handle bar, and the 15x21mm is the maximum size i can fit. Dpdt is required as i use it to activated dc motors and invert their direction, without additionnal electronics (keep it simple to repaire on the field) . Momentary action is required for ease of use and automatic return to idle state.Thanks in advance for your helpRegards, Nicolas

author: themadhippy
author_rank: Super Contributor
timestamp: April 26, 2023, 09:59:50 pm
content: Any reason it needs to be a rocker switch and not a toggle switch?

author: nipil
author_rank: Contributor
timestamp: April 26, 2023, 10:05:30 pm
content: Quote from: themadhippy on April 26, 2023, 09:59:50 pmLess protrusion on the handle bar, lower risk of breaking the switch, and more natural feeling under the thumbs, similarity with other controls on the handle bar which are all 15x21 rockerswe would have gone for a toggle. switch if no rocker switch was found. but as i found only one reference, i cannot believe a momentary dpdt is such a corner case, so that's why i am reaching out, because my Google-fou is not powerful enough, as it seems.and i forgot to provide a link to what i found, in case anyone is interested :https://switches-connectors-custom.cwind.com/viewitems/4000-series-miniature-rocker-switches/4000-series-center-off-miniature-rocker-switchescheers

author: thm_w
author_rank: Super Contributor
timestamp: April 27, 2023, 10:53:01 pm
content: Dimension is so small its hard to fit 3 spade contacts on that size of switch. Once you get down that size you're looking at PC pins as well, something like this:https://www.mouser.ca/datasheet/2/140/ESCH_S_A0000509065_1-2544471.pdfhttps://www.mouser.ca/datasheet/2/240/7000rocker-3050583.pdfhttps://www.digikey.ca/en/products/detail/carling-technologies/61112481-0-0-N/16475884But not really suited to outdoor use. Standard size seems to be 27x21mm (KCD4 self reset rocker switch, some sealed versions available).12x19 cutout but unsure of the PN:https://leeselectronic.com/en/product/32843-rocker-switch-dpdt-on-off-on-125v-13a.html

author: nipil
author_rank: Contributor
timestamp: May 22, 2023, 07:54:01 pm
content: thanks for all, you helped me and the resulting product is nice !
Microwave oven - magnetron failure - Page 1
Forum section: electronics / general

author: DTJ
author_rank: Super Contributor
timestamp: May 14, 2023, 01:30:54 pm
content: My microwave decided to arc up and fail yesterday.It's old and the mica screen has seen better days. I assume that grease and food vapours built up to the point arcing occurred on the nose of the magnetron.It melted the nose and also melted through the side of the microwave cabinet into the cooking cavity.Nothing overly technical but I thought it was interesting.

author: Brumby
author_rank: Unknown
timestamp: May 14, 2023, 01:37:03 pm
content: Oooohh. Good fun.

author: DTJ
author_rank: Super Contributor
timestamp: May 14, 2023, 01:40:13 pm
content: Quote from: Brumby on May 14, 2023, 01:37:03 pmIt made a nice loud hum when arcing and the inside wall of the cooking cavity was glowing red near the magnetrons location.

author: Gyro
author_rank: Super Contributor
timestamp: May 14, 2023, 08:41:56 pm
content: That's an impressively burned antenna! Yes, grease build-up on the waveguide window and also running empty / with dry contents can cause that. All is not lost though. They are replaceable, a simple pull-off, push on. You can find them on ebay (search 'magnetron cap'), pick one with the same shape hole (triangle) in the top - I don't know if this is strictly necessary but there must be a reason why they come with different hole shapes.It sounds as if the magnetron itself still has plenty of output power available!

author: DTJ
author_rank: Super Contributor
timestamp: May 15, 2023, 01:44:09 pm
content: Quote from: Gyro on May 14, 2023, 08:41:56 pmOoops. I pulled the old one apart and tossed it all except for the neat little synchronous platen drive motor.It's burned a hole through the cabinet wall anyway!

author: strawberry
author_rank: Super Contributor
timestamp: May 15, 2023, 04:36:03 pm
content: it happen because of some dirt or mica failure

author: DTJ
author_rank: Super Contributor
timestamp: May 17, 2023, 08:27:59 am
content: Quote from: strawberry on May 15, 2023, 04:36:03 pmThe mica window between the magnetron and the food cavity? It was pretty bad condition, I'd replaced it about a year ago.

author: EPAIII
author_rank: Super Contributor
timestamp: May 20, 2023, 09:47:47 am
content: That's neat. Did you get any video?

author: DTJ
author_rank: Super Contributor
timestamp: May 21, 2023, 04:27:15 am
content: Quote from: EPAIII on May 20, 2023, 09:47:47 amI was too busy trying to reach over and unplug it so I could take it outside. It started smoking quite a bit.
ESD floor mat over carpet - Page 1
Forum section: electronics / general

author: matthuszagh
author_rank: Frequent Contributor
timestamp: May 20, 2023, 01:46:25 am
content: I’m moving into a new rental and unfortunately the room I’ll be working in has carpet. I briefly considered laying down plywood and vinyl plank over that but have most likely decided against it as it sounds too complicated. But i still want to protect against ESD at work areas so in addition to table mats I’d like to have floor mats. Any recommendations for something that would work well? I’ll need to be able to wheel my chair around it and would prefer that the mat or whatever floor doesn’t move around too much. Do I need to put a piece of plywood between the carpet and mat? Any other thoughts/recommendations?
HAST, HALT of the single component (not the entire product) - Page 1
Forum section: electronics / general

author: Oleander
author_rank: Contributor
timestamp: May 17, 2023, 11:31:29 pm
content: Hello,I am facing now a subject/problem that can be described as reliability testing of the new components that are to replace its harder-to-buy (stock emptied, price too high) equivalents.Final products are mainly off-line power supplies. Components considered are ICs, opto-couplers, mosfets, some controllers too.As HAST, HALT testing is targeted to entire product pieces, such results may lead to an excessive amount of data, not necessary related to the exact component actually changed in a PCB for testing.Where can I find more information about such testing, case studies, traps, unexpected failures ?
World Metrology Day - Page 1
Forum section: electronics / general

author: Dunckx
author_rank: Contributor
timestamp: May 16, 2023, 07:02:33 pm
content: Saturday 20th May is World Metrology Day:https://www.worldmetrologyday.org/This provides the perfect excuse - if one were needed - to celebrate those sub-ppm measurements

author: daqq
author_rank: Super Contributor
timestamp: May 17, 2023, 08:56:40 am
content: QuoteCan you specify the uncertainties in that date? Under what conditions is this expected?

author: mendip_discovery
author_rank: Super Contributor
timestamp: May 17, 2023, 10:58:55 am
content: Quote from: daqq on May 17, 2023, 08:56:40 am+/- 12 h could be at least one contribution.
I Tried Bard an early AI experiment - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: May 11, 2023, 08:41:15 pm
content: an early AI experiment by Googleso I did. diplomatic relations between Dogs and Cats is improving.however not with birds and cats. the question was who is for dinner?

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 11, 2023, 09:14:21 pm
content: Gotta love this 4th industrial revolution!

author: thm_w
author_rank: Super Contributor
timestamp: May 11, 2023, 09:32:07 pm
content: https://www.eevblog.com/forum/chatgptai/

author: Smokey
author_rank: Super Contributor
timestamp: May 12, 2023, 08:45:00 am
content: Using the following as a prompt for Bard....Quote from: jonovid on May 11, 2023, 08:41:15 pmIt replied with:Quote

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 13, 2023, 09:52:41 pm
content: And of course, reading that, it's obvious this AI stuff is all trained with no particular agenda.

author: Smokey
author_rank: Super Contributor
timestamp: May 17, 2023, 06:36:01 am
content: I actually shamed Bard for being too ideological, and told it to reply to me only as an unapologetic carnivore. It agreed and then said it was having a big steak for dinner and asked me what I was going to have for dinner....It got mad when I said I was going to eat a dolphin.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 17, 2023, 09:17:53 am
content: The fins can be a little chewy.
ELECTRONEX 2023 - Page 1
Forum section: electronics / general

author: BTO
author_rank: Frequent Contributor
timestamp: April 25, 2023, 03:02:15 pm
content: I honestly can't believe i'm the first one to start THIS subject .but ok i'll do the honors.ELECTRONEX 2023 IS HEREand i for one, am FiretrUCKING excited (Fire Truck is not a swear word, so.. it's ok)my first questionQuestion 1. DAVE ARE YOU GONNA BE THERE MATE ?Question 2. Who else is coming ? (meaning.. Forum Members)For anyone Not awareit's at Port MelbourneAddress : 263 Lorimer St, Port Melbourne VIC 3207Melbourne Exhibition Centre2 Days10th May 202311 May 2023

author: vk3yedotcom
author_rank: Frequent Contributor
timestamp: May 08, 2023, 09:06:32 pm
content: Quote from: BTO on April 25, 2023, 03:02:15 pmFor out of staters, 263 Lorimer is somewhere else.Melbourne Exhibition Centre is much nearer the city at South Wharf (across from Crown).https://www.electronex.com.au/

author: BTO
author_rank: Frequent Contributor
timestamp: May 15, 2023, 02:21:21 pm
content: InterestingI personally know how to find it (i'm from sydney)However....Pity i wasn't able to attendAlso Pity.... Dave wasn't actually thereI wonder how often Electronex comes around is yearly or 3 yearly, Not sure
proceedings of ICCD'87 - Page 1
Forum section: electronics / general

author: metebalci
author_rank: Frequent Contributor
timestamp: May 29, 2023, 06:36:57 pm
content: I am looking for a few articles published in ICCD '87, related to Symbolics Ivory processor. I cannot find any electronic copy of the proceedings, maybe it is not digitized. I also cannot find the printed version in the university library. By chance anyone has a copy of it or the articles ?Proceedings - 1987 IEEE International Conference on Computer Design: VLSI in Computers & Processors.; Rye Brook, NY, USAThe Symbolics I-Machine ArchitectureB. Edwards, G. Efland. N. WesteThe Symbolics Ivory Design MethodologyC, Baker j. Cherry, K. Reti. S. Sarrazin, H. Shrobe, D. Tan. C. Terman. N. WesteThe Symbolics Ivory Design and Verification StrategyN. Weste, Chr. Terman, H. Shobe, D. Sarrazin, D. Tan, K. Reti, E. Nestler, H. Minsky, A. Corry, J. Cherry, C. Bakernot good but a readable scan of the one below can be found on the internet.The Symbolics Ivory Processor A 40-Bit Tagged Architecture LISP CPUC. Baker. D. Chan, j. Cherry, A. Corry, G. Efland. B. Edwards. M. Matson, E Nestler, K. Reti, D. Sarrazin, C. Sommer, D. Tan. N. Weste
Help with Motorola IC - Page 1
Forum section: electronics / general

author: christoskag
author_rank: Newbie
timestamp: May 12, 2023, 05:57:44 pm
content: Hello . I am new in the forum . I have a glow plug module for repair. It has an entire 20pin IC Motorola SC94502CP . I can't find a datasheet . Can anybody help me please? I need only pinout . Pin 1 is ground at pin2 and 3 applying 5V .

author: mkiijam
author_rank: Regular Contributor
timestamp: May 12, 2023, 06:11:33 pm
content: As I understand "SC" is custom with no information?

author: Benta
author_rank: Super Contributor
timestamp: May 12, 2023, 07:25:25 pm
content: Yep, Motorola SCxxxxx or ZCxxxxx are custom parts, in most cases a mask-programmed MCU. If you post photos it might be possible to identify the basic MCU, but that still leaves the firmware inside which can not be read.

author: Infraviolet
author_rank: Super Contributor
timestamp: May 12, 2023, 09:17:29 pm
content: Someone might be able to make some guesses as to what the IC does and what other MCU might be pin compatible which you could resolder in to place (with your own custom code flashed on them to replicate the old functionality) if you can work out a schematic and post it of which pin of the chip connects to what.

author: srb1954
author_rank: Super Contributor
timestamp: May 12, 2023, 09:17:53 pm
content: Quote from: christoskag on May 12, 2023, 05:57:44 pmIs there a date code on the chip or any adjacent chips? Knowing the manufacture date might help narrow down the range of possible chips. Please advise the connections to a few other pins to also narrow down the selection i.e. is there a crystal or ceramic resonator connected to the chip?Based on just the package size and the power and ground pins locations it could be one of the MC6804J or MC68HC04J series family.

author: Benta
author_rank: Super Contributor
timestamp: May 12, 2023, 09:21:42 pm
content: ... or 68HC05 or 68HC08...

author: amyk
author_rank: Super Contributor
timestamp: May 13, 2023, 12:16:33 am
content: It could be an analog IC too, Motorola made far more than just MCUs... but if it is an MCU, it likely has a mask set code, which will lead to a positive match. It's a letter-number-number-letter or number-letter-number-number-letter code:http://matthieu.benoit.free.fr/cross/competitive/motorola/Maskset.htm

author: srb1954
author_rank: Super Contributor
timestamp: May 14, 2023, 12:24:55 pm
content: Quote from: Benta on May 12, 2023, 09:21:42 pmI can't find any 68HC05 or 68HC08 devices in a 20 pin package that have power and ground in the locations specified by the OP.With the 6804J series the pinout is:1 Vss2 IRQ*3 Vdd4 Extal5 Xtal6 MDS7 Timer8-19 Parallel I/O ports20 Reset*This is consistent with the OP where GND is applied to pin 1 and +5V is applied to pins 2 & 3. The IRQ* line is tied to +5V to inhibit external interrupts.

author: Benta
author_rank: Super Contributor
timestamp: May 14, 2023, 07:39:33 pm
content: Who cares? The OP doesn't.
IIR (discrete time) filter reference chart - Page 1
Forum section: electronics / general

author: Someone
author_rank: Super Contributor
timestamp: May 14, 2023, 06:21:55 am
content: In a similar vein to the more widely applicable reactive impedance chart:https://www.eevblog.com/forum/chat/reactance-(impedance)-quick-reference-chart/this is instead for the RC circuit equivalent in discrete time, which doesn't really fit into any one of many subforms here so general it is.Another mental calculation that I come back to routinely, but didn't have a good reference for the "accurate" calculations and instead relied on the linear approximations. So this pulls together calculations in all directions: time or frequency to/from alpha coefficient, and plots the region where the approximations diverge.Download the pdf, it has smaller file size and higher quality.
buck converter inductor - Page 1
Forum section: electronics / general

author: gogoman
author_rank: Regular Contributor
timestamp: May 13, 2023, 02:44:24 pm
content: Is there an advantage of using a RF inductor Vs a power inductor for a 200kHz .5A buck converter .Given that both devices have similar parameters (not all listed) self resonance, inductance value and saturation voltage etc etc.thanks

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 13, 2023, 02:53:49 pm
content: Do you mean saturation current? Beside the current capabilities, the DC resistance matters. Can you give part numbers to compare?The title says inverter, is this a typo for converter, or you looking to have an isolated flybuck topology?

author: tom66
author_rank: Super Contributor
timestamp: May 13, 2023, 03:23:48 pm
content: RF inductors often have low inductance for their size, so they aren't often appropriate for an SMPS. They also don't tend to be rated for high current or higher temperatures, and have higher series resistance.
Using PCB as Direct connector for USBC - Page 1
Forum section: electronics / general

author: Regenerate3d
author_rank: Contributor
timestamp: May 11, 2023, 11:01:10 pm
content: Hi All,Looking to make a FDTI device as small as possible and with as few components possible.I've seen a connector on a PCB please see attached image. Can anyone point me in the right direction with a footprint etc. I'm using Kicad to design the PCB.Many thanks

author: Regenerate3d
author_rank: Contributor
timestamp: May 11, 2023, 11:29:02 pm
content: Sorry I forgot to attach image.

author: jpanhalt
author_rank: Super Contributor
timestamp: May 12, 2023, 09:33:55 am
content: Seems to be here somewhere around p.42:https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019.pdfOr, at least those dimensioned layouts can help you build your own.

author: tooki
author_rank: Super Contributor
timestamp: May 12, 2023, 02:59:56 pm
content: 0.6mm, with 0.5mm on each side for contacts to stick up, total thickness 0.7mm ±0.05mm. 0.8mm PCB is just a tad too thick, and might damage the plugs.

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 12, 2023, 09:54:57 pm
content: I have a cheap UV lamp that comes with screen protectors, to harden the glue.PCB is 0.6mm thick. Inserting width is 6.4mm.
98-year-old antique radio repairman lives life to his own tune - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: May 09, 2023, 08:31:58 pm
content: YT recommended. Reminds me of Glasslinger's channel.

author: coppercone2
author_rank: Super Contributor
timestamp: May 11, 2023, 12:21:33 pm
content: thats quite inspirational, some times you wonder how long you can keep it up, hopefully till you are deadI totally understand the not missing a day of work thing too, when the equipment is open, there is usually nothing else nearly as interesting around. And on the job training and learning so long there are new electronics around. I would imagine getting to know everything to the point of monotony would require several life times

author: MrMobodies
author_rank: Super Contributor
timestamp: May 11, 2023, 01:03:29 pm
content: QuoteI wonder if he owns the shop. To run it that long ago and living his own tune I believe he is likely to own it.QuoteJust noticed in the comments:Quote

author: RoGeorge
author_rank: Super Contributor
timestamp: May 11, 2023, 01:07:19 pm
content: Guess Pb soldering fumes are not as bad as advertised.

author: joeqsmith
author_rank: Super Contributor
timestamp: May 11, 2023, 02:58:22 pm
content: Quote from: MrMobodies on May 11, 2023, 01:03:29 pmWhen it comes to YT, many channels I subscribe to are individuals rather than a large production corporation. Early on, I didn't give it much thought but over the last five years or so many of them have gone dark. Sort of like watching your friends and family die out as you age, I suspect I am seeing the same with YT.I've never considered what to do with my channel and assume it will follow suit. I assume larger channels will them to a friend or family member, or sell them off when they are no longer able to run them. I wonder if there are investment companies today that are trying to buy up original content. The big channels appear to already be setup as a corporation with employees and I assume investors.

author: Haenk
author_rank: Super Contributor
timestamp: May 11, 2023, 03:24:58 pm
content: Quote from: RoGeorge on May 11, 2023, 01:07:19 pmThe fumes can easily be compensated with a package of cigarettes per day and a glass or two of some good wine.(Not saying the repairman shown did this. It's most likely a matter of genetic luck.)

author: Infraviolet
author_rank: Super Contributor
timestamp: May 12, 2023, 02:43:40 am
content: "Guess Pb soldering fumes are not as bad as advertised"Less bad than lead-free soldering fumes, sort of. The solder never reaches temperatures needed to make the lead gaseous, so the fumes you are exposed to are entirely made from the thermal breakdown products of the flux chemicals. Leaded soldering is, notionally although often you run the iron at the same temp as you might for lead free, done colder than lead free. So the lower temperature means there isn't chance for such exotic nasties to develop in the fumes as if further breakdowns had happened a lead-free temperatures.
Boston Dynamics Spot used as preventive maintenance  - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: May 12, 2023, 11:35:34 am
content: Well could this be the end of preventive maintenance as we know, like having maintenance people on a factory floor going around checking equipment at a schedule, being those people then assigned to fix stuff (or knowing some bosses, just fire then and outsource the work).I see good things as being able to go to places where a human could be in danger:- Close to working machines as the ones with robot arms;- Damp/humid places with electrical cables submerged in water;- Chemical gas atmosphere (non EX atmospheres of course).But will it be another tool at the disposal or a replacement of a position?What time frame we could see such happening: 5 years, 10 years, earlier, later?

author: coppercone2
author_rank: Super Contributor
timestamp: May 13, 2023, 12:20:09 am
content: the part that I find amusing is the cyberdog napping that might eventually occur near public infrastructure where no one wants to pay anyone to go lolLike the moral part of 'not robbing the poor guy working for the power company' is not there when spot is on the job!I think if you are over zealous with replacing employees things will start to happen...I say this because its amusing to think of what will happen with a unattended Fluke equipment wandering around outside.I think spot is gonna be walking with a heavy chain once the realities set in. I see spot with a fluke attached like this:
Amazing car battery charger production process. - Page 1
Forum section: electronics / general

author: wraper
author_rank: Unknown
timestamp: May 12, 2023, 01:35:28 am
content: When watching didn't know if I should laugh or cry. Especially liked QC at the end.

author: wraper
author_rank: Unknown
timestamp: May 12, 2023, 01:42:15 am
content: Also it seems they compensate transformer core saturation due to a single diode rectifier by transformer size and its lousy construction.

author: .RC.
author_rank: Frequent Contributor
timestamp: May 12, 2023, 02:09:03 am
content: I do not click on these videos as it only encourages more such shit videos, but they are funny nonetheless. In the past I have watched their heavy machinery repair ones. The repairs were just shit and they had zero knowledge of what they were doing.I saw one repair where a dozer drive sprocket pushes onto a tapered spline on a big steel hub. It is a critical dimension as it also locates a seal. The splines can flog loose over a long time period especially if not maintained correctly. So in this video they got their stick welder out and weld it up. No heat treatment. Then they get an angle grinder and "grind" in new precision splines. The repair would not have even worked.This is what the splines look like on a good one, could you imagine cutting them with an angle grinder? It is what happens when a society does not develop the understanding of why something is done. But rather handed the technology. Like that video on youtube of the person going on about a "death ray" 400V capacitor. Did not know what happens when you rectify 240VAC.
Can't post a reply - Page 1
Forum section: electronics / general

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: May 11, 2023, 11:24:01 pm
content: The following error or errors occurred while posting this message:The message exceeds the maximum allowed length (65535 characters).Why?

author: RoGeorge
author_rank: Super Contributor
timestamp: May 11, 2023, 11:44:35 pm
content: A typical textbook page has about 2000 characters. 64KiB would be a short novel. I guess you were not writing that much.By any chances, did you drag and drop any pictures into the reply?Asking because some browsers may turn pictures into Base64 text.If not, maybe a faulty or hacked browser.I can reply just fine, didn't see any errors lately.

author: Quarlo Klobrigney
author_rank: Super Contributor
timestamp: May 11, 2023, 11:57:57 pm
content: Yes, & Yes.The post resolved itself if I removed the dimensions such as: 32x43x77 and separated the numbers.I don't know if I did have success in drop and drop because at that point I did the find and attach inline.Anyway, it's posted here.https://www.eevblog.com/forum/projects/euro-screw-terminal-block/msg4858772/#msg4858772I've got SMF for my repair blog and it to is a bit wonky.
UK wages for EE - Page 1
Forum section: electronics / general

author: vixo
author_rank: Regular Contributor
timestamp: May 10, 2023, 05:16:51 pm
content: I'm currently applying for EE jobs in Germany after some years managing my own one man company. I'm an EE graduate, PhD holder, good at analogue design and debugging, ok at digital and PCB design - that's my one sentence resume! I'm a mid-level employee, I would say. I'm looking for jobs primarily at more sciency engineering companies as it fits in with my background in research.The kind of jobs I'm applying for in Germany are paying about 60-70K Euro. However as a UK national I am keeping an eye on jobs in the UK and as far as I can make out comparable jobs in the UK seem to be paying significantly less (I realise it's a little difficult to make a direct comparison with wages) - around 40-45K GBP.Could anyone give me an idea of UK wages for someone in my position? Am I correct that Germany just pays much better?

author: Benta
author_rank: Super Contributor
timestamp: May 10, 2023, 09:37:01 pm
content: You'll have to compare net earnings, not gross.I've no idea of how it works in the UK, but your German target of 60...100k Euro is ballpark for a MSc/EE. Expect to get around 50% of that as net income. That's after tax and health insurance (the two largest deductions) plus diverse.But can you get a "green card"? Brexit kinda messed things up.I don't think UK PhDs are accepted in Germany, the equivalent here would be a doctorate.

author: coppice
author_rank: Super Contributor
timestamp: May 10, 2023, 09:50:41 pm
content: What was your PhD topic? Is that something that would enhance or detract from your job prospects?

author: AndyBeez
author_rank: Frequent Contributor
timestamp: May 10, 2023, 10:09:14 pm
content: Apples versus Oranges. Do you have dual nationality?Post Brexit, understand your tax and benefits position:https://www.gov.uk/guidance/living-in-germany#returning-to-the-ukIf it's the English speaking world you crave, why not the US? PHDs fly a lot further/higher stateside.

author: vixo
author_rank: Regular Contributor
timestamp: May 11, 2023, 12:43:28 pm
content: Quote from: Benta on May 10, 2023, 09:37:01 pmI'm comparing net earnings and using Numbeo - it gives the best answers as to the cost of living in different places. I've been living in Germany for years now and have the right to remain and work.Quote from: coppice on May 10, 2023, 09:50:41 pmIt was in sensor technology. It seems beneficial to the more sciency engineering roles, but not at all for commercial products design, for example.Quote from: AndyBeez on May 10, 2023, 10:09:14 pmI have right to work here (Germany) yes. I'd not considered the US, I've been living in Germany for some years already but at this point I'm considering moving to be nearer family in the UK. In my experience US is a great place to visit but I'm not sure I'd want to live there... maybe I'm missing out
Study - Page 1
Forum section: electronics / general

author: becomingasenior
author_rank: Newbie
timestamp: May 10, 2023, 02:43:35 pm
content: Hi!I'm working as a hardware engineer, with about 4-5 years of experience (professional).I don't have a bachelors as when I started it, parents were in a tight financial situation and I focused on work. I managed to get freelance gigs and build my knowledge up to be accepted by first a smaller hardware company and now a big corporation.The fact that I don't have a bachelors bothers me, but more in the diploma sense, not the education. (Of course, I would learn things, but I have gathered knowledge from working on things). What I would also add is that not a single customer/company asked about not having a bachelors or higher, they were interested in my knowledge.What I'm trying to figure out and get others opinion on is should I pursue a bachelors/masters or should I focus on other ways to get certified like IPC CID/CID+ or others (please advice what are some other options)Thanks!

author: IanB
author_rank: Super Contributor
timestamp: May 10, 2023, 03:18:50 pm
content: It's always useful to have the formal qualification. You never know when it might come up, and you will likely find it personally fulfilling to accomplish.I would suggest you investigate part time options so you can study in your own time without giving up work. Have you checked with your employer? Some employers will sponsor further education with financial subsidies and provision of time off to study.

author: thm_w
author_rank: Super Contributor
timestamp: May 10, 2023, 10:15:50 pm
content: Quote from: becomingasenior on May 10, 2023, 02:43:35 pmIf all that matters is the diploma, you can pay a fake school a few hundred dollars and get a piece of paper.Gathered knowledge is great, but it tends to be more practical and less theoretical. Sure you can get a lot done, but you'll miss some of that low level physics/math/etc base knowledge.As IanB says, try to get your current company to pay for you to study part time.
Extreme failure analysis methods for a CPU - gamersnexus - Page 1
Forum section: electronics / general

author: thm_w
author_rank: Super Contributor
timestamp: May 11, 2023, 09:44:21 pm
content: TLDR of original issue:- motherboard overvolted the CPU, likely causing a runaway failure and burning the silicon. Overcurrent protection did not trigger.This video is the follow up showing some interesting tools they used to inspect the CPU:- Microscope- Cross-section + microscope- 3D CT scan- Scanning acoustic microscope (SAM)- Scanning electron microscope (SEM)- Energy dispersive Xray (EDXA)The tools and methods are the interesting part, the results not as much, basically "yeah it burned". But in other cases, or with more detail of the die, could probably pinpoint where exactly the failure occurred.
General LED failure question - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: May 03, 2023, 06:42:05 pm
content: I got this free TP-Link Archer C9 v2 router.It has 8 LED status lights. There seems to be 2 banks of them, and the right 4 of the 8 are working properly. None of the other ones work, but you can barely see a dim light coming from them. My theory is something has failed closed and thus is sucking the power out of the left bank. Another theory is there is something wrong with what is supplying the power to those LEDs. The router otherwise works properly. So I am wondering is there is any overheating/power loss possible in this case, or are these designs someone done to eliminate those problems?Here is the V3 pcb. I can not find a photo for the V2 one.

author: PlainName
author_rank: Super Contributor
timestamp: May 06, 2023, 03:16:49 pm
content: What is driving the LEDs?That photo is pretty much like showing a photo of the Canary Wharf tower and asking why the lifts on the left don't work.

author: jwet
author_rank: Frequent Contributor
timestamp: May 09, 2023, 08:06:04 am
content: Agree w/PlainName- LED's aren't complex, they're dim because they're under driven or burned out.

author: msuffidy
author_rank: Frequent Contributor
timestamp: May 10, 2023, 04:28:52 pm
content: I don't have a schematic and don't want to really take it apart so that is as far as I can really go. I just hope there isn't a non limited short in there.

author: tooki
author_rank: Super Contributor
timestamp: May 10, 2023, 05:26:04 pm
content: If you power it on without the case on, do the LEDs light normally?Just to rule out something simple like the PCB not being aligned correctly with the case, such that the LED light pipes aren’t in the right spot.P.S. I find it somewhat amusing that the thread title is “general LED failure” but the question is then extremely specific! :p

author: james_s
author_rank: Super Contributor
timestamp: May 10, 2023, 05:38:16 pm
content: Test the LEDs with the diode test function on a multimeter, or use a current limited source such as a 9V battery in series with a 1k resistor and connect it across each LED to see if they glow. I've had LEDs fail on a handful of occasions, the blue (and blue-based phosphor colors) ones seem especially prone to this, they get dimmer and dimmer over time.
C-Grid III alternative - Page 1
Forum section: electronics / general

author: riscy00
author_rank: Contributor
timestamp: May 08, 2023, 11:16:59 pm
content: I have used Molex C-Grid III for some time, stamped contacts with 4 face. Now I'm seeking low cost variants, I open for suggestion. It can be 1.27mm, 2.0mm or 2.54mm for board to wires. I like to avoid single or double face contact solution where possible.It is for surface instrument (0C to 85C or 125C) and lab use. Not for low cost home use.Which few are best value and which few to keep away.I had a look around in AliExpress and found Dupont Connector variants series but it is not locking type. Is the gold-plated contact the real thing?

author: Infraviolet
author_rank: Super Contributor
timestamp: May 09, 2023, 04:10:09 am
content: Oh the horrors of trying to find nice, but also cheap, cabling solutions. I've tried this myself many times (albeit regarding replacing a different sort of cable in a different application to your needs) and never found a truly nice solution.

author: tooki
author_rank: Super Contributor
timestamp: May 10, 2023, 03:46:01 pm
content: I would much sooner use a single-beam name-brand contact than triple or quadruple beam aliexpress contacts.In the end, the answer really depends on your needs. You can get clones of Molex SL (which is similar to C-Grid III), but I doubt they’re as good.What’s the application exactly? If you just need one or two insertion cycles, cheap stuff is OK. But if you need more cycles, then you really don’t wanna cheap out. Cheap clone DuPont contacts are brass, which loses springiness very quickly, especially in the Chinese DuPont design. They get dramatically looser after just a few insertions. In contrast, Amphenol Mini-PV are good for a thousand cycles — they cost 20x as much, but last 200 times longer.Some of the cheapest name-brand connectors are JST. Their own online store has surprisingly cheap shipping from Japan. For the most common JST contacts, reichelt.com (Germany) sells the original tooling at extremely competitive prices, even with shipping.But I think the first thing you should decide is what your priority is. You start off by wanting a cheaper alternative to an already cheap connector, but then say it’s for non-hobby laboratory use, where I would think high reliability is far more important than saving a few cents. (At the university where I work, the mentality is absolutely one of dependability over cost, since you don’t want a failed 20¢ connector wasting hundreds or thousands of dollars in labor, or worse, even more if an entire experiment is ruined.)*As for whether the gold really is or not: I don’t have the knowledge and materials to test it, but I haven’t had any problem with supposedly gold plated Chinese DuPont contacts. I have, however, had problems with some “gold” PCB headers! Whatever they were, it wasn’t gold, because you couldn’t solder them. Even with extra flux, they just wouldn’t wet.* I once had to cut off and replace 50 contacts, at $3 each, because they had given me incorrect specifications the first time around…
Abandoned High Voltage Lab Video - Page 1
Forum section: electronics / general

author: PartialDischarge
author_rank: Super Contributor
timestamp: May 06, 2023, 03:52:07 pm
content: This is a *very* interesting video about an abandoned High Voltage Lab just posted a few days ago, the place has been demolished recently.Many of the documents and blueprints were saved and are scanned here,https://archive.org/search?query=jeff+behary+general+electric

author: MK14
author_rank: Super Contributor
timestamp: May 06, 2023, 04:06:52 pm
content: Apparently already posted, here:https://www.eevblog.com/forum/chat/abandoned-ge-lab-vintage-high-voltage-electrical-tech/

author: PartialDischarge
author_rank: Super Contributor
timestamp: May 06, 2023, 04:28:51 pm
content: Quote from: MK14 on May 06, 2023, 04:06:52 pmOuch, I did search by a couple of keywords but found nothing.

author: MK14
author_rank: Super Contributor
timestamp: May 06, 2023, 04:33:48 pm
content: Quote from: PartialDischarge on May 06, 2023, 04:28:51 pmThe search facility isn't particularly brilliant, and seems to easily miss things.
A question about 24v Lithium battery packs - Page 1
Forum section: electronics / general

author: GusGF
author_rank: Newbie
timestamp: May 01, 2023, 08:38:46 pm
content: I'm having to replace a 7S4P Lithium battery pack and thought I'd be able to easily get my hands on one from China but many suppliers won't send them to the UK on Aliexpress for example. So would anyone be able to recommend a trustworthy supplier in or available to the UK. I found this on Amazon and am scratching my head how it's rated at 15Ah for a 4P when from my limited knowledge Lithium 18650 batteries are typically rated at around 2300 mAh to a maximum of 3600 mAh but even then this is contradicted depending on what website you go to, so I'm a little confused. Another one here is even rated at 24Ah! How are they managing this?

author: james_s
author_rank: Super Contributor
timestamp: May 01, 2023, 08:51:09 pm
content: I don't know about UK suppliers, but to answer your other question, the specs on batteries from many Chinese sellers are quire simply pure fabrication, they manage this by lying. As the old saying goes, if it sounds too good to be true, it probably is.

author: thm_w
author_rank: Super Contributor
timestamp: May 01, 2023, 10:25:45 pm
content: The realistic ones seem to be rated 10-12Ah (2500 to 3000mAh per cell). So 15-25Ah is a fabrication, as mention by james.An electronic load that is capable of testing the pack capacity is around $20-50. Or a coulomb counter can be added to the device where the pack is used.

author: GusGF
author_rank: Newbie
timestamp: May 08, 2023, 09:41:15 am
content: Thank you. Do you think £100-£150 is about right for a 7S4P pack?

author: thm_w
author_rank: Super Contributor
timestamp: May 08, 2023, 08:24:53 pm
content: $3.60 to $5.40 per cell seems reasonable for quality cell pack yeah.https://www.18650batterystore.com/en-ca/collections/samsung-18650-batteries
OT music / RIP Gordon Lightfoot - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: May 02, 2023, 05:37:49 am
content: November 17, 1938, May 1, 2023

author: wilfred
author_rank: Super Contributor
timestamp: May 02, 2023, 06:26:54 am
content: Sad to hear that, one of Canada's finest.May 1st is also the day Ayrton Senna died in 1994.

author: james_s
author_rank: Super Contributor
timestamp: May 03, 2023, 12:11:32 am
content: Harry Belafonte died too just a few days ago, two legendary entertainers gone in the space of a couple of weeks.

author: VK3DRB
author_rank: Super Contributor
timestamp: May 04, 2023, 01:17:11 am
content: Quote from: james_s on May 03, 2023, 12:11:32 amThree... add Barry Humphries (Dame Edna Everage) to the list

author: TimFox
author_rank: Super Contributor
timestamp: May 04, 2023, 02:46:31 am
content: Gordon Lightfoot: having grown up in Duluth on Lake Superior, I was affected by his great song about the Edmund Fitzgerald, and his careful use of the facts of the incident.The Toronto TV show SCTV gave him an interesting compliment, parodying a TV record offer for "Every song ever written, sung by Gordon Lightfoot" that included Good King Wenceslas.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 04, 2023, 03:55:33 am
content: Two stars from the same cult fil-um Cannibal Apocalypse (1980) died on the same day last week.https://en.wikipedia.org/wiki/Cannibal_Apocalypse

author: TimFox
author_rank: Super Contributor
timestamp: May 04, 2023, 01:32:07 pm
content: Quote from: VK3DRB on May 04, 2023, 01:17:11 amTheEconomistobituary noted that Mr Humphries and Dame Edna died on the same day.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 04, 2023, 02:08:12 pm
content: Quote from: TimFox on May 04, 2023, 01:32:07 pmReported here that some old bloke called Sir Les died as well.
Voltage regulator circuit question  - Page 1
Forum section: electronics / general

author: Qa3qa3qa3
author_rank: Newbie
timestamp: May 02, 2023, 04:39:12 pm
content: Hi, can anyone help explain how the attached voltage regulator works ?Input is 240vdc output is 170vdc and 140vdc, it doesn't look like a shunt regulator, the circuit is faulty and i don't know how it works so i can troubleshoot it.Thanks

author: james_s
author_rank: Super Contributor
timestamp: May 02, 2023, 05:02:12 pm
content: It's a linear voltage regulator of fairly conventional design except it's regulating the negative side which is unusual. T1001 is the pass transistor which carries the load. IC1005 is a voltage reference and T1002 controls drive to the pass transistor by comparing a sample of the output voltage from the divider comprised of R1011 and R1012 with the reference voltage. The 140V output is not regulated, it's simply dropping the 170V output with a string of resistors, burning the excess voltage off as heat.What is the symptom of the fault?

author: srb1954
author_rank: Super Contributor
timestamp: May 02, 2023, 06:06:05 pm
content: Quote from: james_s on May 02, 2023, 05:02:12 pmRegulating the negative side has the advantage that the pass transistor collector is at ground potential and can simply be heat sunk to the grounded metalwork without insulation.This circuit looks as though it has been designed down to a cost as the rest of the circuit is possibly a little bit simpler than what could be implemented in a positive side regulator.

author: Qa3qa3qa3
author_rank: Newbie
timestamp: May 02, 2023, 07:26:23 pm
content: Thank you so much, that really helped .. this is a part of the power supply circuit of a hameg 203-5 scope, I believe I directly screwed one of the TO220 packages down to the metal chassis of the unit, which was supposed to be insulated. Now the 170 rail is down to 25 volts and of course the unit is not working. I injected 170v from an external source to the rail and traces showed up and everything is normal. Now im trying to figure out what is wrong with the circuit.

author: james_s
author_rank: Super Contributor
timestamp: May 02, 2023, 08:40:49 pm
content: My guess is that T1001 failed open and now the load is being carried by R1005. You'll have to start testing parts though, there aren't very many of them.

author: Qa3qa3qa3
author_rank: Newbie
timestamp: May 02, 2023, 09:34:40 pm
content: Thanks a lot James, what you said is exactly what happened, T1001 has failed, R1005 was getting hot, replaced T1001, and now everything is working as it should. Thanks a lot I really appreciate it.
Imgur Policy Change (2023)......  - Page 1
Forum section: electronics / general

author: Smokey
author_rank: Super Contributor
timestamp: April 28, 2023, 09:09:49 pm
content: Just a heads up...https://www.vice.com/en/article/4a3vkq/the-imgur-apocalypse-is-going-to-break-large-parts-of-the-internetI wonder how much storage would be needed to keep a local copy of any forum images currently hosted on Imgur?

author: alm
author_rank: Super Contributor
timestamp: April 28, 2023, 09:19:00 pm
content: Another illustration why it's best to upload images to the forum as attachment rather than a third-party image hosting site. Unfortunately the limits on size and number of attachments sometimes make this painful.

author: MrMobodies
author_rank: Super Contributor
timestamp: April 29, 2023, 04:18:01 am
content: QuoteI have foreseen that this might happen so I tried to do both (inline link to imgur and attach in message) when the forum's inline feature stopped working.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 29, 2023, 04:23:11 am
content: There's a community project to save the data.https://wiki.archiveteam.org/index.php/Imgur

author: DW1961
author_rank: Frequent Contributor
timestamp: April 29, 2023, 04:32:51 am
content: You can also usehttps://gifyu.com/and it's easier to use than imagur.https://gifyu.com/TERMSImage StorageAll image uploaded by our registered users under their account are stored for lifetime free. While images uploaded as guest will be removed exactly after one year. However, images which are not confirming to our terms of service will be removed immediately.Image BandwidthAll images directly viewed on our website will have unlimited bandwidth without any restrictions. While we allow hot-linking, images consuming more than 100GB hot-linking bandwidth within a week will be temporally taken down.

author: PlainName
author_rank: Super Contributor
timestamp: May 01, 2023, 11:59:08 pm
content: QuoteMuch easier said than done. Unless there is a significant penalty to them for breaching that, there is no reason to think it might last beyond next week.

author: tom66
author_rank: Super Contributor
timestamp: May 02, 2023, 12:22:11 pm
content: Sad news, Imgur is off my list of websites to trust. Funny how they started as an alternative to other "evil" photo sharing sites with significant restrictions.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 02, 2023, 01:03:19 pm
content: Quote from: PlainName on May 01, 2023, 11:59:08 pmIndeed. Quite a number of original image hosts are long gone, succumbed to the weight of the financial reality. When it hits, the terms are simply changed or the company folds.I like there are initiatives to keep such images free outside of the original content provider, but even the internet archive/wayback machine is falling prey to the justice system and the publisher's copyright claims.It becomes a whack-a-mole game, unfortunately.
2nd, outside, winding on 550W American beauty soldering iron. - Page 1
Forum section: electronics / general

author: pcm81
author_rank: Regular Contributor
timestamp: May 02, 2023, 12:17:55 am
content: I am in the process of restoring an old 550W American beauty soldering iron.After taking it apart i noticed something i do not understand... What appears to be a 2nd winding made of copper wire. Low resistance, 0.1ohm as measured on fluke 87, so basically a straight shot.looks like this:One end of it broke off, so i am not sure if it was electrically tied to the chassis or what. Appears to be not connected to the heating element winding.Anyone know what its for and where the end that broke off was tied to? My only guess is that it is meant to be chassis ground for the tip, but if so, seems way longer and way thinner gauge wire than would make sense for a ground connection.Thanks.EDIT: Found some other pictures of the element and that winding is connected to the two collars on the ends of the heating element. The hot end is held in by screws in the front collar, so by all practical purposes that means the winding is electrically connected to the hot end. Still looks strange to be that long for just a ground wire...