hybridfree/eevblog-posts huggingface dataset:
ebay eu vat - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: August 14, 2021, 10:08:55 am
content: 5th day unable to pass customs. they want to charge vat as well.waiting, no answers/solution from : customs, ebay, seller, postal service.some IOSS nr.? can get it only by buying shipping label on ebay.?

author: wraper
author_rank: Unknown
timestamp: August 14, 2021, 10:38:00 am
content: Likely it is included in the shipping address the same way as it earlier happened for Norway and some other countries. And seller screwed up by not putting it on the package. Probably just used address in an email from PayPal, AFAIK not everyone is included in ebay managed payments yet.

author: strawberry
author_rank: Super Contributor
timestamp: August 15, 2021, 06:24:54 am
content: purchase historymore actionsview order detailsshow additional actionsdownload VAT invoice with IOSS nr.

author: strawberry
author_rank: Super Contributor
timestamp: August 18, 2021, 08:20:39 am
content: got to pay twice whatsoeverdumb system

author: wraper
author_rank: Unknown
timestamp: August 18, 2021, 08:55:53 am
content: Quote from: strawberry on August 18, 2021, 08:20:39 amAsk for partial refund for amount paid in VAT. If seller refuses, open a dispute on ebay. Attach a photo of a label on the package, so it's apparent there was no IOSS nr., and proof of additional VAT paid.

author: wraper
author_rank: Unknown
timestamp: August 18, 2021, 09:04:04 am
content: Quote

author: tunk
author_rank: Super Contributor
timestamp: August 18, 2021, 09:50:50 am
content: My experience with a similar system in Norway is that the equivalentcode is added by the seller in about half the instances. So I've startedto add it to "address field #2".

author: kripton2035
author_rank: Super Contributor
timestamp: August 18, 2021, 10:14:55 am
content: Quote from: tunk on August 18, 2021, 09:50:50 amwhere can you get the correct ioss number for your country ?

author: strawberry
author_rank: Super Contributor
timestamp: August 27, 2021, 09:17:01 am
content: IOSS nr was printed on packagebefore shipment. maybe it should be entered in some system???customs came up with copy & paste s** (f*** off its your problem now) and gave some thin clues what I need and where to get. and its called their help centre or something.updates: up to 20 days for ebay to process refund.

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: August 27, 2021, 01:54:36 pm
content: Quote from: kripton2035 on August 18, 2021, 10:14:55 amIOSS number is per seller, not per country or recipient, so ebay has at least one, amazon another, etc.
USB2504A? Anyone got one? - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: August 26, 2021, 12:22:46 pm
content: Looking for a USB2504A - we just need one for a project. Thought i'd ask here before I have to spend $90 on buying 10 from the US.Also? Should/could we get a 'shortages' section of this forum. Dave?

author: fcb
author_rank: Super Contributor
timestamp: August 27, 2021, 11:24:01 am
content: Bump.Or anyone got the demoboard with one on it I could purchase?

author: grrmachine
author_rank: Contributor
timestamp: August 27, 2021, 12:09:22 pm
content: Quote from: fcb on August 26, 2021, 12:22:46 pmDem feels ;-;Got a few USB2514B but that's a different package altogether :/

author: fcb
author_rank: Super Contributor
timestamp: August 27, 2021, 12:43:28 pm
content: So close! Thanks for the reply.
LCD replacement on a Fluke 8024B - Page 1
Forum section: electronics / general

author: zmetzing
author_rank: Contributor
timestamp: August 26, 2021, 10:34:17 pm
content: Just repaired a Fluke 8024B that was found in the e-waste bin. The LCD was replaced, like others in this thread, and two electrolytic capacitors were also changed out as they had started to leak. Mouser had the LCD (LCD-S3X1C50TR/A). I'm thinking of adding LEDs in the case for the missing UP/DOWN signal indicators on the original glass.Kudos to the threads on this forum about the possibility of replacement.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 27, 2021, 01:44:11 am
content: Nice, another classic saved.
Is Doug Ford still in business? - Page 1
Forum section: electronics / general

author: bw459205
author_rank: Newbie
timestamp: August 23, 2021, 10:53:32 am
content: His website is not working.I'm trying to develop some low noise microphones + preamps for an outdoor application, and need some help from somebody who knows what they are talking about.

author: dzseki
author_rank: Frequent Contributor
timestamp: August 23, 2021, 12:18:15 pm
content: Definitely no Doug Ford, but just a few days I ago I came across this:https://www.beis.de/Elektronik/LNPA60dB/LNPA60dB-en.htmlCheck for the other projects too, might be of help...

author: 25 CPS
author_rank: Frequent Contributor
timestamp: August 23, 2021, 07:01:51 pm
content: Only until June 2, 2022.
Old chip date code - anyone understand it? - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: August 21, 2021, 04:01:31 pm
content: Sorting out some very old ICs, I came across this date code series.These are all MC899P, MRTL (Medium power Resistor Transistor Logic, MC700/800 series) from the late 1960s through 70s. It's a "dual buffer."In the photo the left hand pair are the earliest - they have the 4 bumps on the package underside, that rapidly went out of style. The next pair's date code is 7204 ie 4th week of 1972. The right hand pair are 7725, 25th week of 1977.But what does "905" mean? Is it a date code or something else?Oh, and those were the days when ICs might be supplied in little styrofoam boxes. Before static electricity was invented.

author: elecman14
author_rank: Unknown
timestamp: August 21, 2021, 05:37:43 pm
content: Guessing the 5th week of a year ending in 9. If you really wanted to get to the bottom of it you may be able to find the date code format in a data book. I would start looking at 1969 since the 70's parts seem to have the 4 digit format.

author: amyk
author_rank: Super Contributor
timestamp: August 21, 2021, 09:31:00 pm
content: Single-digit years are 196x.

author: TerraHertz
author_rank: Super Contributor
timestamp: August 22, 2021, 02:05:33 am
content: Quote from: amyk on August 21, 2021, 09:31:00 pmAh ha. I guess that makes sense as a general rule, since there were no ICs before the 1960s.So really the rule is 'three digit date codes have just the first digit for the year.'I wonder if any of the people doing IC package dissection to photograph the die, have done very oldlogic like the early RTL & DTL chips.It turns out that among a recent 'old parts windfall' I now have a good range of those.

author: magic
author_rank: Super Contributor
timestamp: August 22, 2021, 03:35:17 pm
content: These biologists tore down a few very old chips from their lab's spare parts drawer, apparently as an excuse to play with FNA and their microscope toyshttps://resnicklab.wordpress.com/2013/05/There is some digital rubbish in there, I haven't even looked at it

author: floobydust
author_rank: Super Contributor
timestamp: August 22, 2021, 06:51:34 pm
content: I have National Semiconductor LM3914 I am sending to Noopy, date code 007.Pretty sure that is 1980, as the part was not out in 1960 or 1970. The old data books could find no info explaining the date codes.As I recall, three digit codes the "decade" was left out and assumed to be something people could figure out.
This neon power supply has a "cos" spec. of .99 does that mean - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 30, 2021, 12:21:37 am
content: It says cos,then a little theta letter I think then say 0.99https://youtu.be/U4n5vmpFtXw?t=796The video starts at the label, also an interesting one to watch, I want to see him light up all the spectrum lights then put them into a splitter."cos .99": is that the power supplies way of saying dont feed square, triangle, or (most likely from its age) rheostat generated waves AC through it or you will damamage it? This looks rather old is that not an issue anymore? What would happen if you put square or rheostat waves into a modern cheap SMPS? Nothing? What about into a linear PS the good heavy ones from the pre 2000's(wall bugs) that were just two windings and minimal parts? I always keep those when I can find them, nice clean power for your projects, ordering one from china will set you back 40 bucks.

author: AlbertL
author_rank: Regular Contributor
timestamp: August 30, 2021, 12:42:32 am
content: "Cosine phi" is - more or less - the "power factor" of the device.This explains the two terms:https://cache.industry.siemens.com/dl/files/748/51402748/att_88178/v1/faq_51402748_e.pdf

author: Beamin
author_rank: Super Contributor
timestamp: August 30, 2021, 05:11:18 am
content: Quote from: AlbertL on August 30, 2021, 12:42:32 am"Cos phi results from the ratio of effective power (P) to fundamental apparent power"So the manufacture is concerned with the power factor and not the shape of the wave? I wouldnt think that would matter in something small unlike a big motor.so .99 represents almost perfect power factor? Where would you plug that into the equations on that pdf link page ?What does happen when you run a power supply over a rheostat or other funky nonsine waves.

author: james_s
author_rank: Super Contributor
timestamp: August 30, 2021, 05:28:08 am
content: Unity power factor is 1.0, like a purely resistive load. True power and apparent power exactly the same. On a small scale power factor isn't really a big deal but think about it on a larger scale. You could have many thousands of these things operating around the country along with countless other devices. It all adds up, and you end up with megawatts of reactive power which results in a large amount of wasted energy in transmission losses and wasted capacity of the power grid. You're billed based on true power but the wires and transformers and such have to be sized based on apparent power because it's the current that heats up the wires.
Seeking Fluke art photo - Zero Ohm - Page 1
Forum section: electronics / general

author: Bobson
author_rank: Regular Contributor
timestamp: August 21, 2021, 12:50:05 pm
content: Several years ago, I've seen photo of a naked pair, lying in the bed, holding probes in their hands, and Fluke DMM reading 0 Ohm on its display. I couldn't find it now.I'm 100% sure forum people have this photo, help me please!

author: Benta
author_rank: Super Contributor
timestamp: August 21, 2021, 04:07:25 pm
content: DMM porn? That's a new fetish to me.
Any AC input dual output +/-15 Vdc 100 W power supplies to choose - Page 1
Forum section: electronics / general

author: mike buba
author_rank: Contributor
timestamp: August 20, 2021, 03:20:32 pm
content: Hi,I am looking for a AC/DC dual output metal enclosure power supply:Vin: 230 VacVout1: +15 VdcVout2: -15 VdcPower: >90 Wto supply Semikron IGBT drivers.Apart from Meanwell (e.g. QP-200F), are there any other products available to compare or choose? Tracopower TXL series is end of life and TXLN series is still not available. Power-One, now Bel Power Solutions, is also out of stock.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 21, 2021, 12:54:26 am
content: Have you considered two 15V modules in series?

author: mike buba
author_rank: Contributor
timestamp: August 21, 2021, 07:02:42 am
content: Quote from: NiHaoMike on August 21, 2021, 12:54:26 amI also need -15 Vdc. Not sure I understand.

author: mansaxel
author_rank: Super Contributor
timestamp: August 21, 2021, 07:16:57 am
content: Quote from: mike buba on August 21, 2021, 07:02:42 amIf you take two single voltage 15V modules, and connect +Ve from module 1 to "+15V" on your consumer, then join -Ve from that module to +Ve from module 2 and "GND" on the consumer, and finish by connecting -Ve from module 2 to "-15V" on the consumer, you've built a dual voltage supply.Theimportant assumption hereis that theoutput on the modules must be floating w.r.t ground/chassis/mains PE. Most Mean Well supplies for instance solve this.There's an UK seller offering new 15VMean Wellshere-- they've only got a capacitor between -Ve and GND which likely make them OK for your application, as long as you're not floating too many Volts away from GND.Then of course, I'm no EE and my guess is as good as yours. But it's a start.
Relay-Based Floating Point Square Root Calculator - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: August 15, 2021, 02:37:01 pm
content: Amazing project with a telephone dial for input, Nixie tubes for output and a motor-driven two-phase "clock"!

author: rstofer
author_rank: Super Contributor
timestamp: August 15, 2021, 03:09:29 pm
content: Thanks for posting this, it's great!

author: TimFox
author_rank: Super Contributor
timestamp: August 15, 2021, 03:42:07 pm
content: I remember using an electro-mechanical calculator (Friden?) sometime before 1970 that could extract square roots: it was fun to watch, as the carriage shifted back and forth and the numbers moved behind their windows.

author: EPAIII
author_rank: Super Contributor
timestamp: August 19, 2021, 08:33:56 am
content: Great 1950s technology. Hollywood would love to have it...... und watchen der blinken lights!

author: AlbertL
author_rank: Regular Contributor
timestamp: August 20, 2021, 03:05:11 pm
content: For those who want to experiment with relay computing but don't want to spend the time and money to actually assemble a project, I'm thinking a programmable logic controller would be an alternative that could faithfully simulate physical relays. There are some very capable but inexpensive PLCs on the market, like the Click line from Automation Direct
Porche 919 Hybrid Evo Tribute Tour: On-board record lap, Nordschleife  - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: August 21, 2021, 05:27:12 am
content: The 919 Tribute Tour: On-board record lap, Nordschleife.What a fun looking thing to do, certainly as a video-gameThat sure looks like fun, but my eyes and spine would probably break. I think I had the Nordschleife on a PS2 Gran Tourism game, and I loved it, and my PS2 died long before I really got used to the Nordschleife

author: mawyatt
author_rank: Super Contributor
timestamp: August 21, 2021, 05:00:28 pm
content: That's insanely fast!!There's also some good in-car videos of the Porsche 911 GT2 and GT3 running the 'ringBest,

author: MathWizard
author_rank: Super Contributor
timestamp: August 21, 2021, 05:53:17 pm
content: I'd be happy to get a better game controller for the few PC racing games I have. I think I have a game w/ the Nordschleife, or there's a mod for it or something.I'd love to make a model racing car/simulator with seat/steering wheel/etc. I'd love to make them and sell them, and add hydraulics do the all electronics.look at the simulator they have in the 1st 1-2minutes
Nixie Watch - Page 1
Forum section: electronics / general

author: Howardlong
author_rank: Super Contributor
timestamp: September 06, 2021, 11:06:09 pm
content: I added a Nixie tube subclass to the Open SmartWatch project. Because I am a certified nerd.

author: Bassman59
author_rank: Super Contributor
timestamp: September 06, 2021, 11:16:30 pm
content: I need to get a new battery for mine!
Brass wires for battery pack - Page 1
Forum section: electronics / general

author: Srivatsa R Upadhya
author_rank: Newbie
timestamp: August 20, 2021, 01:53:52 pm
content: I don't know if this is a good idea!! Can I use brass wires instead of Nickle strips to connect cells in my battery pack? The pack is a 13s4p combination.
Repairing printed carbon trace vias? How are the vias made? - Page 1
Forum section: electronics / general

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: July 30, 2021, 01:35:45 pm
content: Picked up a couple of 'junk' Casio VX-4s from Japan. Both had had battery leakage, the worldwide scourge of electronics. #GTDBO (Get the Darn Batteries Out). Anyhow, one needed some cleaning and a few jumpers on the LCD row driver. The second has a lot of corrosion on the keyboard PCB.The keyboard PCB is two sided but the bottom is printed carbon only, there is no copper layer. The top is copper with a few printed carbon resistors. The missing traces are no problem to fix but the vias are another issue. I cannot tell how the vias were made. They have an opening in the center as a plated though PCB typically would but as the bottom of the PCB is only printed carbon there would have been no way to plate the holes. I suspect then that the holes are injected with a conductive adhesive but then how is the hole in the center formed? The vias are also all coated with a drop of something translucent from the top side. Perhaps to protect the copper/conductive glue bond?Not knowing how this type of PCB is manufactured I'm not sure how to attempt to repair the few damaged vias on the PCB. Not that it is a particularly important PCB but I like a challenge. If this PCB had copper on both sides I would just get out the through hole PCB copper via ferrule kit and have it repaired. I could still try and but put a tiny dab of conductive glue under the ferrule on the bottom side. If the carbon is not too brittle such that it would crack when the ferrule was pressed flat this might work.So, after all my rambling I guess the questions are:1) How are the vias on these types of printed carbon PCBs made?2) Any other repair ideas?Thanks!

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: July 31, 2021, 12:54:23 am
content: Decided to scrape off the translucent coating on a good via and found a brass ferrule had be pressed through the PCB. It looks like it protruded just through the board, was flared out to hold it in place and then overprinted with the carbon. I'm not sure how it will work to insert a ferrule after the fact, as one would do with a two copper layer PCB but it is worth a try. It is already broken at this point.

author: Jeff_Birt
author_rank: Regular Contributor
timestamp: August 17, 2021, 06:21:18 pm
content: I was able to repair this PCB. Using the Pace repair ferrules and trace segments worked great. After pressing the ferrule into place I put a dab of CiaKote on the carbon trace side of the PCB and soldered the ferrule to the trace on the top side. If anyone is curious I did a video on the repair.https://youtu.be/o0a6JhiZ1Gk
Sony Spears - Page 1
Forum section: electronics / general

author: rowan5877@hotmail.com
author_rank: Newbie
timestamp: August 15, 2021, 07:49:01 pm
content: Hi all,I've got a Sony CDP-CE525 CD player.The circuit board that has the headphone jack is broken.Can anyone help with getting another one?Regards Rowan

author: tooki
author_rank: Super Contributor
timestamp: August 16, 2021, 11:38:10 pm
content: The service manual has the Sony part numbers for the board as well as for the individual components on it. But wouldn’t it be easier to just fix the board, that being likely the singular simplest board in the device?
5-phase stepping motor - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: August 15, 2021, 02:16:37 pm
content: HelloActually I have chosen a 5-phase stepping motor driver and the IC number is SI-7510 but I see theminimum main voltage should be 10V. ( Main voltage should be between 10V to 24V)now my problem: I have found many 5-phase stepping motors but when I see the specification of the motors I see only a resistance and a current, for example 0.3 OHM and 2.7A.how should I find a 10V or 12V stepping motor? I think I should calculate something from the specification.can I use a 5-phase 0.5 OHM and 1.5A Motor or a 0.4 OHM and 1.2A Motor or ...?Thanks

author: rstofer
author_rank: Super Contributor
timestamp: August 15, 2021, 03:13:37 pm
content: In vague terms, you want to select as high a voltage as the chip will allow and connect the sense input to control the winding current. The higher voltage will drive the winding current to maximum a lot faster in the presence of winding inductance and will increase the workable step rate.You might spend some time with "Jones On Steppers"https://homepage.divms.uiowa.edu/~jones/step/I didn't spend much time looking at the schematic, it seems complex, but I did notice that the Sense input is not used. Hm...I might start with the Typical Application schematic from the datasheet - top left of page 2https://www.semicon.sanken-ele.co.jp/sk_content/si-7510_ds_en.pdf

author: jmelson
author_rank: Super Contributor
timestamp: August 16, 2021, 03:36:36 pm
content: There is no such thing as an xx Volt stepper. The only spec that matters is winding current.Cheap consumer stuff like floppy disk drives used motors with artificially high winding resistance so they could be run without a current limiting resistor or PWM circuit.So, for your use, all you need to do is supply enough voltage for the driver chip to operate, and then you will see that higher voltages permit the motor to operate at higher speeds before the torque falls off.Berger-Lahr invented the 5-phase stepper, and licensed the technology to Oriental Motor, with theur Vexta and super Vexta lines of motors and drivers.Jon
Photonic induction tredmil burnout: What was that little choke/transformer for - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 14, 2021, 11:54:20 am
content: At the time stamp in the video he says "wonder what thats for " it a small transformer or choke after the diode stack. He never explains its purpose.Also can anyone tell from the logos spinning down the side how fast it goes? Could he have sold it to Usain Bolt to practice on? Great marketing idea :a treadmill so fast Kenyans can use it! (Yes I know bolt is jamacan but my business wants volume on treadmill sales)https://youtu.be/Ig4NK2xeboI?t=345

author: strawberry
author_rank: Super Contributor
timestamp: August 14, 2021, 12:49:32 pm
content: that is cool feature indeed but why so tiny it could pop for sure

author: H.O
author_rank: Frequent Contributor
timestamp: August 14, 2021, 01:01:23 pm
content: Looks like a relay to me. Probably what he's using to reverse the direction of the motor.

author: Beamin
author_rank: Super Contributor
timestamp: August 14, 2021, 05:25:42 pm
content: Quote from: H.O on August 14, 2021, 01:01:23 pmHow does it handle 1000s of watts?

author: Bud
author_rank: Super Contributor
timestamp: August 14, 2021, 06:50:40 pm
content: This guy will end his days in a psychiatric hospital.

author: SteveyG
author_rank: Unknown
timestamp: August 14, 2021, 07:30:23 pm
content: Quote from: Beamin on August 14, 2021, 05:25:42 pmThose pluggable relays are typically rated in excess of 25A per contact.

author: Beamin
author_rank: Super Contributor
timestamp: August 15, 2021, 02:36:01 pm
content: Quote from: Bud on August 14, 2021, 06:50:40 pmHis last video when he stopped posting for 2 years was a rant about UK immigration not letting his wife in and he had this free energy machine and some sort of rocket ship gadget in the back ground.Or you are talking about me and used he instead of she but I will also probably end up spending my day in the looney bin.

author: Zero999
author_rank: Super Contributor
timestamp: August 16, 2021, 07:48:53 am
content: Quote from: Beamin on August 15, 2021, 02:36:01 pmThe one he made about his new perpetual motion machine idea, was more indicative of mental illness. Anyway, he seems to be better now.By the way, this most people in this forum are male. People will make that assumption about everyone else here, including you, so don't let it get to you. I'm male and used to post on a mostly female forum and didn't get butt hurt, when others referred to me as she and her.
Need a GNSS positional receiver with low phase delay - Page 1
Forum section: electronics / general

author: bson
author_rank: Unknown
timestamp: August 15, 2021, 09:02:06 pm
content: I'm in need of a GNSS receiver with low phase lag. By this I mean if it's moving along tracking position and the vehicle slows down it needs to reflect this and not "rubber band" out in front of the actual position. Secondary sensing like a wheel rotational sensor would be okay, but it needs to either be integrated with the positional receiver or have an open file format so I can update the positional track myself (I don't mind writing a bit of software). So it doesn't need to be real-time accurate, only correctable a posteriori. Speeds are low, no more than 30-35mph, mostly looking at a 15-20mph range. Satellite views vary, and some positional error is fine but phase lag isn't. I can't possibly be the first to need this, so any ideas? (My initial thought is to use a wheel positional sensor to measure wheel rotations, integrate this to distance traveled, and use that for compensation myself in a post processing step using software I probably get to write myself.)

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: August 15, 2021, 10:33:35 pm
content: Some GNSS receivers (uBlox, for example) support commands to adjust their internal dynamic platform model. Perhaps this will get you closer to what you need?

author: David Hess
author_rank: Super Contributor
timestamp: August 16, 2021, 02:20:47 am
content: Some GPS receivers can be configured for a faster solution and update rate like 5 or 10 Hz which will help considerably with lag.
How dangerous is a Mode 1 EV charger? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: August 14, 2021, 10:01:19 pm
content: Hi,How much more dangerous is an Electric car with a mode 1 charge point, when compared to this type of electric shower?...This type of electric shower is used by many tens of millions of people every day, without problem....

author: ataradov
author_rank: Super Contributor
timestamp: August 14, 2021, 10:20:33 pm
content: Why would they be dangerous? Are you into some new conspiracy theory?

author: Benta
author_rank: Super Contributor
timestamp: August 14, 2021, 11:18:40 pm
content: Quote from: ataradov on August 14, 2021, 10:20:33 pmIgnore it. "treez" is bored.

author: Ian.M
author_rank: Super Contributor
timestamp: August 15, 2021, 01:16:43 am
content: Quote from: ataradov on August 14, 2021, 10:20:33 pmDo bearz sh!t in the woodz?

author: Siwastaja
author_rank: Super Contributor
timestamp: August 15, 2021, 08:06:52 am
content: The danger relates to the long lasting tradition of manufacturing and selling substandard wall sockets while the authorities look in other direction. For example most of the Europe uses the Schuko sockets and plugs which are rated at 16A (and testing procedure includes 22A load test for half a hour if I recall correctly) but in practice if you load these plugs at 16A for hours in wide scale, electric fires will be common. Nothing technically ever prevented making Schuko sockets and plugs that can take 16A*1.5 (to blow an upstream 16A gG fuse) for an hour or two even when aged, but that would've been more expensive. It's race to the bottom, we do this in Europe as well, always did, the brag about safety of our local products is mostly empty talk.Such fires happened before EV charging but no one gave a shit. Regulators let this happen. But now suddenly having a lot of EVs everywhere made the problem worse, so the solution was to limit charging currentsignificantly, e.g. for Schuko plugs different legislations ended up between 6A to 10A. Limit current to such low value and fire safety will be fine, obviously you can always find a seriously damaged old outlier socket but if this burns your house at 8A then this would happen sooner or later anyway with any type of load.AFAIK the British plugs and sockets are significantly better.

author: Gregg
author_rank: Super Contributor
timestamp: August 15, 2021, 05:05:13 pm
content: Quote from: Ian.M on August 15, 2021, 01:16:43 amIf a treez fell in the woodz and no one replied, would it matter?And could a fallen treez return to upright without group assistance?Would the bearz care?
Holograms: Closer Then We Once Thought - Page 1
Forum section: electronics / general

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 12, 2021, 09:13:59 pm
content: These people figured out how to use the "light tweezer" effect to make images. Now obviosly it's sensitive to blowing away the trapped particle and is size limited, but he made real floating images, I'd call that a sucess.An explanation of the effect.

author: BrianHG
author_rank: Super Contributor
timestamp: August 13, 2021, 09:11:52 am
content: Why didn't you post Styropyro's video on the suspending objects, like diamonds in a laser beam from like over 4 years ago. He was moving / positioning the diamonds around in mid air just by lifting the moving the laser.

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 14, 2021, 10:56:13 pm
content: Quote from: BrianHG on August 13, 2021, 09:11:52 amThat wasn't making images. The light tweezer effect has been known for a while, but nobody had a system that was fast and precise enough to make images.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: August 15, 2021, 08:49:03 am
content: I hate the nitpick on terminology here, but those are technically "volumetric images", not holograms. Holograms are typically higher dimensional images encoded in a lower dimensional plane.
Electronics and Instrumentation engineering. - Page 1
Forum section: electronics / general

author: Srivatsa R Upadhya
author_rank: Newbie
timestamp: August 11, 2021, 01:26:25 pm
content: I am planning to get into electronics engineering. I came across the course in Electronics&Instrumentation engineering. There are two more i.e Electronics&Communication and Electronics&Electrical Engineering. After searching the internet I feel E&I and E&E are quiet similar. I am unable to make a choice between the three.I just want to know what are the major differences between the three. Which one would be a good choice ?

author: krish2487
author_rank: Frequent Contributor
timestamp: August 11, 2021, 03:42:20 pm
content: Is doing "Electronics Engineering" a journey for you? or a destination , in and of itself ??If it is the latter, then any of the three will be the same. If it the former, then you should have areasonable idea about the width and depth of what encompasses "electronics engineering" and whereyour interests lie. Then the choice of stream will be easier.To phrase it, its like me asking you for your opinion on what is the best car for me to drive ??

author: armandine2
author_rank: Frequent Contributor
timestamp: August 12, 2021, 04:18:33 pm
content: It looks like all options include electronics - if communication and instrumentation don't float your boat I'd stick to electrical.

author: Kerlin
author_rank: Regular Contributor
timestamp: August 12, 2021, 11:03:32 pm
content: What I have done in the past was to do one and get accreditation for it, and then do the other one and get exemptions for the common subjects.It often means you only need to do a few extra subjects.It looks like you have done a lot more work than you actually have.That's one of the secrets of my 1Kg weight of qualifications and licenses, they do allow me a choice of jobs.

author: Srivatsa R Upadhya
author_rank: Newbie
timestamp: August 13, 2021, 12:38:43 pm
content: Yeah cool!!

author: asperised
author_rank: Contributor
timestamp: August 15, 2021, 08:14:20 am
content: Hey!I see that you're from India, I am currently in my 4th year of Btech in Electronics and Instrumentation. They're not similar fields but in fact quite different. Although the electronics part in both the courses are pretty similar the subjects on the side are very different. EIE has a lot of Control systems, Sensors and transducers, Industrial automation and even PLC programming stuff in the course. I don't know much about ECE but from what my friends tell me of the course it seems quite different from EIE. The lab work for both the courses are also very different.
What material power/extensio cords you prefer? VV(PVC), BQ(PUR), RN(Rubber) ...  - Page 1
Forum section: electronics / general

author: Miyuki
author_rank: Frequent Contributor
timestamp: August 12, 2021, 08:27:12 am
content: Hijust choosing new cables to the workshop to replace annoying old PVC ones - they are so stiff (when not outside on direct sun)Might stick with H07BQ - PUR seems nice light and flexible and as a bonus are available in a huge variety of colorsWhat cables do you use? Just the cheapest PVC ones or something fancy?btw I recently saw an interesting marketing BS: Copper clad aluminum cable is good because is much lighter than a copper one

author: nctnico
author_rank: Super Contributor
timestamp: August 12, 2021, 11:20:57 am
content: I like the neoprene rubber ones the best. I think I have used a PUR sheeted cable for a new mains cable on my compressor but I found it very easy to cut so I'm worried that it may not last that long.

author: TMM
author_rank: Frequent Contributor
timestamp: August 12, 2021, 03:06:47 pm
content: cheapo PVC suits me just fine. The stiffness prevents it getting hung up when being dragged around table legs and such

author: elekorsi
author_rank: Regular Contributor
timestamp: August 12, 2021, 05:05:56 pm
content: Have a look at those:https://elektron-berlin.de/en/produkte/wires-cables/Not cheap, but excellent cables for extension cords. Price for 3G2,5 is around 2,5€/m, but you must buy 100m. They make custom print on every meter, for example your company name (this is included in price and is not extra!).

author: Miyuki
author_rank: Frequent Contributor
timestamp: August 12, 2021, 07:09:00 pm
content: Quote from: elekorsi on August 12, 2021, 05:05:56 pm2,5€/m is a common price for a decent cableThey have nice matching ends for it, niceWow they have interesting stuff 1kW LED flood light

author: thm_w
author_rank: Super Contributor
timestamp: August 13, 2021, 09:14:03 pm
content: Quote from: Miyuki on August 12, 2021, 08:27:12 amResistivity of aluminum is 58% more than copper, but 3.3 times lighter. So... if you could get around those pesky oxidation and bending issues with some kind of special alloy, maybe I could see it being good advertising.
Transformer Winding Machine - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: August 12, 2021, 06:34:47 pm
content: HelloI want to wind up several Flyback transformers as following:The core is small, it's a cylinder with a Diameter of 1" and a Length of 1.5"so I need a winding machine but it should be accurate. (not for funny, I want to produce some hundred Flyback transformers)Thanks

author: Benta
author_rank: Super Contributor
timestamp: August 12, 2021, 08:56:38 pm
content: Your winding schematic is very odd, but I guess you have reasons for it.Normally you'd wind back-and-forth to get a smooth winding and maximum bobbin fill.Second, this is something I'd shop out to a company doing it all day and having the necessary machines.

author: bob91343
author_rank: Super Contributor
timestamp: August 12, 2021, 09:44:46 pm
content: The odd winding scheme has to do with high frequency performance of the transformer. It reduces the interwinding capacitance by separating the parts of the winding that have high potential between them. It's basically a pi-wound coil which, electrically, is several smaller coils in series. Magnetically, they are all linked equally.

author: xzswq21
author_rank: Frequent Contributor
timestamp: August 12, 2021, 09:56:34 pm
content: Quote from: bob91343 on August 12, 2021, 09:44:46 pmYes, exactly

author: Red Squirrel
author_rank: Super Contributor
timestamp: August 12, 2021, 10:05:33 pm
content: That pattern also prevents arcing between the wires as the voltage difference between any wires that are near is minimized. This at least applies to high voltage transformers anyway.I learned this the hard way.Kapton tape between the layers helps a lot too.

author: Benta
author_rank: Super Contributor
timestamp: August 12, 2021, 10:12:56 pm
content: I have a few problems accepting this explanation.The interwinding capacitance is from my analysis the same with both winding methods.The isolation stress is higher with a back-and-forth winding. Yes. We can agree on that.But the big difference is the winding segmentation, and I'm totally with you that it'll give another result.

author: jonpaul
author_rank: Super Contributor
timestamp: August 13, 2021, 01:12:40 am
content: Hello: We made 1000s of similar transformers 1W to 100s of watts and up to 20kV.The segmented bobbin is a very old method and reduces the wire insulation stress, as well as self capacitance.Either layer wound perfect lay as show or random wind is used but the best is a universal winding where the wires cross at an angle.Old Stevens and MicaFil machines appear on occasion but the best are Adams Maxwell, 1201-01 or 1201-02 costly but excellent. We have about 5 of these in continous use for decades.http://adamsmaxwell.com/Bon ChanceJon
QFN-16 Exposed Thermal Pad Help - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: August 11, 2021, 04:33:58 am
content: im using a QFN-16 IC.in the datasheet it states for the exposed pad "Heat sink grounding can not be connected to other potential"so does this mean i should tie the exposed pad underneath to GND or no?

author: jpanhalt
author_rank: Super Contributor
timestamp: August 11, 2021, 09:55:55 am
content: This link shows a completed board with some thermal images. It appears that center pad is connected thermally and electronically to the ground plane. Note the 9 vias in the bottom view.https://lygte-info.dk/review/Review%20Charger%20TP5000%204.2-3.6V%20module%20UK.html

author: wraper
author_rank: Unknown
timestamp: August 11, 2021, 09:57:58 am
content: It means that GND pad cannot be connected to anything other than GND. If you measure resistance between center pad and GND terminal, most likely they are electrically connected.
PartKeepr v1.4 VirtualBox VM Release - Page 1
Forum section: electronics / general

author: Inhibit
author_rank: Newbie
timestamp: August 10, 2021, 07:22:39 pm
content: PartKeepr, if you haven't seen it before, is a web application for tracking your inventory of parts. It has all the basic functionality I needed to load in my passive component, active component, and connectors and get them somewhat organized. This has helped me A) make the excess available to friends and for sale and B) not buy the same thing three times for different projects.So I've made the PartKeepr VM I created available for download to help other folks out and promote a free software package I like. Since the install can be a little tricky if you're not familiar with LAMP stack setup.What you'll need to do, should you want to use it, is to change the user/root passwords and re-run setup to create a (hopefully securely passworded) user account and SQL db. And that's about it. Oh, and I would treat this as an insecure server out of the box, even with the password change, that you would want to harden before exposing even the Apache install to the Internet.There was a bit of a problem with PHP versioning to get the release to work so it's running on Debian 9 "Stretch" LTS. As that had the correct libraries for the current version of PartKeepr. If the maintainers upgrade it you can probably roll the Debian install up to version 10.My (limited) release notes and the download link are up on PCBurn:https://pcburn.com/partkeepr-vm-on-debian-9-stretch-for-virtualbox/That's a Google Drive download link.Please let me know if you'd all like any changes to the base image. I might go back and do some clean-up if it's popular.
Inductor Help - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: August 11, 2021, 03:36:09 am
content: hey,im trying to copy a lithium usb charging board based on the tp5000 ic..im trying to design my own and have them assembled by jlbpcb since i can order a bunch and have them within 1 week instead of waiting a month..ill post a picture of said board.**the schematic and datasheet just show a 4.7uh inductor but no other specs.but on jlcpcb parts inventory they have a bunch of 4.7uh smd inductors with different DC Resistance (DCR) and rated current...im assuming i need one with a rated current of my circuit but what about the DC Resistance (DCR)they range from 19mega ohm to 500 mega ohm...any ideas of which one would be best?[ Specified attachment is not available ][ Specified attachment is not available ]

author: hagster
author_rank: Frequent Contributor
timestamp: August 11, 2021, 05:35:21 am
content: Hopefully the DCR is in Milli ohms not Mega.A lower DCR is more efficient.You should also check the self resonant frequency SRF. This needs to be significantly higher than the switching frequency(800khz).

author: james_s
author_rank: Super Contributor
timestamp: August 11, 2021, 06:07:16 am
content: I think that's probably milli ohm, not mega. 500 megohms would be ridiculously high for an inductor. Assuming it's milliohms you want the lowest possible in most cases.
More breadboards - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: August 08, 2021, 05:18:47 pm
content: I was looking for a breadboard, and all I find is populated breadboards.Some are hosting 2-3 completely different circuits on the same breadboard, and some circuits are as old as 5 years, or as old that I don't even remember how old they are. Should I clean out all the parts, should I give them a PCB and finish those projects, or should I just buy more breadboards?I wonder how common is this. What's your oldest "temporary" circuit on a breadboard?

author: rdl
author_rank: Super Contributor
timestamp: August 08, 2021, 06:30:41 pm
content: This is definitely my oldest, though I don't really have that many. It's still in a box somewhere. I keep thinking it needs more improvements, but for some reason I rarely work up the motivation. This photo was posted here in 2015 and it was about 2 years old then. I have changed it a bit since, but not much.

author: esepecesito
author_rank: Regular Contributor
timestamp: August 08, 2021, 06:45:27 pm
content: Right now I do not have any, mine typically live like 2 years. I would buy more and store all... it will be nice in some years to see all of them.

author: DrG
author_rank: Super Contributor
timestamp: August 08, 2021, 08:39:39 pm
content: Quote from: rdl on August 08, 2021, 06:30:41 pmLightweightJuly 1993. PIC 16C54 [binary display clock] got the 'tick' from the 60 hz mains. Even have a printout of the code and schematic. Pic taken today.....hey, I'll get to it - sheesh I've been busy
The worst example for an Aluminium PCB - Page 1
Forum section: electronics / general

author: tszaboo
author_rank: Super Contributor
timestamp: August 08, 2021, 01:51:05 pm
content: Because of Poe's law (Poe's law is an adage of Internet culture stating that, without a clear indicator of the author's intent, it is impossible to create a parody of extreme views such that it cannot be mistaken by some readers for a sincere expression of the views being parodied.) I dont know which one is the proper reaction:or

author: SilverSolder
author_rank: Super Contributor
timestamp: August 08, 2021, 02:11:30 pm
content: Live and learn, lol!
PCB connector, right angle - Page 1
Forum section: electronics / general

author: PlainName
author_rank: Super Contributor
timestamp: August 07, 2021, 08:36:48 pm
content: I am stuck for an easily acquired connector pair for attaching one PCB to another at right angles. My particular requirements are that the horizontal PCB may have PTH connector, and will meet the vertical PCB edge-on (forming the base part of a T junction). The vertical PCB must have a SMD connector - no pins poking out the other side of the PCB.I would like two sets of 4 pins, preferably in two rows, but single rows or a single connector of 2x4 would be acceptable as second best.So far I can find a Samtec jobby for the horizontal part:https://uk.rs-online.com/web/p/pcb-headers/7656423/but that bit is ten a penny if I go PTH. It's the other bit that has me stumped: straight 2x4 SMD socket should be easy to find, but I'm blowed if I can.Any suggestions? The project is a front panel attached to a gizmo PCB, hence the requirement for SMD on the back side. Needs to be cheap, not take up much room, and the vertical PCB must be adjustable for position (at the design stage, to account for the main PCB mounting height in the box).

author: jc101
author_rank: Frequent Contributor
timestamp: August 08, 2021, 08:39:41 am
content: If you're in the UK, drop a line to Toby (https://www.toby.co.uk) and explain what you are looking to achieve. They sell via their website but I've found them good at hunting down such things too once they understand the requirement.

author: PlainName
author_rank: Super Contributor
timestamp: August 08, 2021, 08:54:56 am
content: Thanks! I see they do light pipes too, which is another thing on my list

author: fcb
author_rank: Super Contributor
timestamp: August 08, 2021, 10:01:14 am
content: +1 for Toby. Also, Samtec are very responsive (Toby are also agents for Samtec).
Google app overcharges - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: July 29, 2021, 09:21:44 pm
content: Found this in a newspaper and it reminds me of Amazon many years ago for some things that I tried to but when I got to payment and delivery and when the shipping charges were applied they turned out to be too much and not worth it.https://www.independent.co.uk/business/google-app-charges-subject-of-new-uk-legal-claim-b1892846.htmlQuoteI know of a friend many years ago who was being charged in the thousands for adwords a month all because it was doing well but kept on rising and rising and it got to a point where it was costing more more than the sales it was attracting.Don't think I ever brought anything from the Playstore directly as I just download stuff and install it manually.Nice when they are free though and I mean really free from advertising and data collection.I have a few phone stuff which are suppose to be free and free from advertising but some of them after a year or so displays a one time notification to consider donating for the developers time and effort if I like it for something like $5 which sounds alright and doesn't seem much.To buy something like this I'd rather, buy it directly maybe through Paypal, download it where it becomes mine and manually install it on the phone or tablet rather than "signing in" and have no control over it or whatever goes wrong with the future updates.What do you think?

author: ataradov
author_rank: Super Contributor
timestamp: July 29, 2021, 09:57:21 pm
content: ThisQuoteis wrong. You can install Amazon Appstore and F-Droid on any device you like. Google is as open with its store and policies as it gets.Europe just likes to milk US companies for easy money, since they can't make anything decent on their own.Also, why are you complaining about 30% fee on $3 app? Do you not remember the time when it was normal to pay $30-$50-$100 for equally capable software?

author: Bassman59
author_rank: Super Contributor
timestamp: August 01, 2021, 07:58:53 pm
content: Quote from: ataradov on July 29, 2021, 09:57:21 pmOr, remember when boxed software was ordered by brick-and-mortar stores that paid a wholesale prices that was 50% of retail?

author: telliz
author_rank: Newbie
timestamp: August 06, 2021, 01:51:04 pm
content: This lawsuit ignores the advantages and functions of Android and Google Play, as well as the competitive market in which Google operates. The gatekeeper of many digital services, it is your responsibility not to abuse this clause or overwhelm ordinary consumers. "These hidden payments are illegal, and Google's customers should be compensated and better treated by Google in the future." In this regard, a Google spokesperson said, "Compared with any other mobile platform, Android gives people greater powers. Decide which apps and app stores to use; in fact, most Android phones come with more than one app store pre-installed.