hybridfree/eevblog-posts huggingface dataset:
Sourcing?? 1.0mm Pitch Board to Board 100 Pin Connectors Or Headers Source. - Page 1
Forum section: electronics / general

author: KG7AMV
author_rank: Frequent Contributor
timestamp: March 04, 2024, 04:29:50 pm
content: I am trying to source a replacement Board to board connector for the Oupiin 2348-100G00DP1T Board to Board Mezzanine Connector. Mfg Says Discontinued.Data Sheet..https://www.oupiin.com/download.html?act=gTData&dID=4146PhotoI did find one supplier that claimed they hadhttps://www.dghecon.com/productinfo/2190163.htmlafter discussion they did not have the mold for 100pin only 80 ughhh.Alternative would be to replace the Oupiin Connectors and use headers. They use them in the Board stack but cannot seem to find the source for like kind either. I have looked very close at the Header connector no mfg markings and Stack height needs to be 8mm.Anyone? ID These Headers?MaleFemaleThanks.

author: thm_w
author_rank: Super Contributor
timestamp: March 05, 2024, 10:19:21 pm
content: Your post for reference:https://www.stevenrhine.com/?p=130422Have you checked that just standard 1mm SMD headers will not fit the footprint?https://www.aliexpress.us/item/3256805788002696.html

author: EPAIII
author_rank: Super Contributor
timestamp: March 06, 2024, 10:30:58 am
content: Two 50 pins and a few minutes work with a Dremel.Align them for soldering with a couple of lengths of the pin headers suggested by thm_w.

author: tooki
author_rank: Super Contributor
timestamp: March 06, 2024, 10:32:51 pm
content: Would one of Samtec’s 1.0mm pitch headers work? They claim to have up to 100 position models.
Why x-ray security scan won't damage chips? - Page 1
Forum section: electronics / general

author: hap2001
author_rank: Regular Contributor
timestamp: March 05, 2024, 01:45:54 pm
content: Well I just have this question.I've heard even the metal reflector in X-ray machines will be dented by the energy, so how do all nanometer-level chips pass the scanner unharmed?

author: David Hess
author_rank: Super Contributor
timestamp: March 05, 2024, 03:03:03 pm
content: The x-rays do damage the semiconductors but the damage is insignificant because the total dose is low.

author: TimFox
author_rank: Super Contributor
timestamp: March 05, 2024, 04:28:44 pm
content: What is this “metal reflector” of which you speak?As said above, this is a quantitative question: x-ray CT scanners apply more dose than line-scan radiographs, and are a threat to photographic films.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 05, 2024, 04:51:04 pm
content: X-ray is usually not damaging most materials. It is only the really sensitive parts like biological tissue, photographic film and EPROMs (and related, like flash) that can seee some damage. Even the normal EPROMs only loose some of the information (e.g. like aging for a few years), not a hard damage.The anode is an x-ray tube can get some damage, but this is from the electrons to create the x-ray hitting it.
Yummy - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 03, 2024, 01:46:57 am
content: https://www.washingtonpost.com/climate-environment/2024/02/27/pink-beef-rice-hybrid/

author: Zero999
author_rank: Super Contributor
timestamp: March 03, 2024, 10:19:36 pm
content: There's no way I'm eating that. Our food is already artificial enough.
Help identifying USB C port Please - Page 1
Forum section: electronics / general

author: kPATm
author_rank: Regular Contributor
timestamp: March 02, 2024, 11:08:53 am
content: Hello. I need to replace the charging port on a HP Notebook X2 but I cant find a replacement port. It looks a bit different from the usual.Thanks for the help

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 02, 2024, 10:06:12 pm
content: https://www.aliexpress.com/item/3256803303546036.html
LiPo battery supplier for commercial product - Page 1
Forum section: electronics / general

author: rfspezi
author_rank: Regular Contributor
timestamp: March 05, 2024, 10:08:55 am
content: I need a reliable supplier of LiPo batteries preferrably in the EU.The battery is for a commercial product.Volume is around 1000 pcs./year.The Battery needed is a 500mAh, single cell, pouch-type LiPo with integrated PCM, 10k NTC and JST-connector.So far, i found a chinese supplier who offers a lot of variants "www.lipolbattery.com".However, the company does not look too trustworthy.Can anyone recommend a reliable supplier?

author: Haenk
author_rank: Super Contributor
timestamp: March 05, 2024, 10:50:30 am
content: They provide datasheets and don't hide their address, that's a plus.However, I could not find them on Alibaba, and they don't offer a chinese site with their company license number, that's at least something to look into.Other than that, I would take a look at Alibaba offerings (not Aliexpress), check for a manufacturer that has been in business for years.But: 1000pcs is not a lot, probably well below usual MOQs. You might get lucky right now though, because the manufacturers will grab any order they can, even if they don't make a profit. (On the downside, the struggling manufacturers might take your money and then go silent, it is a bit risky. But then it is only 1000 bucks, so a full loss hopefully don't bankrupt you.)

author: jc101
author_rank: Frequent Contributor
timestamp: March 05, 2024, 06:37:53 pm
content: You could try Alpha Micro in the UK (https://alphamicro.net/product-category/power/batteries), they will give you a price for a battery if you give them all the specs.
Interesting - laser soldering video - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: February 29, 2024, 01:04:56 pm
content: https://youtu.be/ZaDFNA32qDQI was thinking about the case of using a single laser with a precision mirror, gimbal system which could effectively "charley-plex" all SMD "pad" solder paste spots repeatedly in a loop.Did a quick search and found the video above. It highlights a lot of pit falls of laser soldering but demonstrates a lot of fixes for said pit falls too.Most seem to use wire-fed solder and a very short range laser which moves around making the process pretty slow. The demos with a wide area laser or multi-point seem far, far faster. Probably require a far far higher power laser too.Anyway. I am going to put it on the "not for hobbiests like me.... yet".
Resistor Identification - Page 1
Forum section: electronics / general

author: Lani
author_rank: Newbie
timestamp: February 22, 2024, 02:32:48 pm
content: Hey there folks.... I have a bunch of these resistors but they all came in unmarked bags so I'm unsure who the manufacturer is. It came in a lot that also had RN55 Dale/Vishay resistors so I would assume that they are also Dale/Vishay but cant seem to find a datasheet for them. Anyone recognize these?

author: EPAIII
author_rank: Super Contributor
timestamp: February 26, 2024, 11:34:55 am
content: That's quite an assortment. Most of them seem to have a brown band that is spaced a bit wider at one end. That is probably a 1% marking and explains the use of four bands instead of three for the value: three significant digits and a multiplier.You did not include anything in the photo for a size comparison so it is difficult to say what power rating they may have. But if I had to guess I would say either 1/2W or, more likely 1/4W. But then, often the higher precision resistors will have different sizes.As for the type of construction, if you don't mind losing one, you could break it apart to examine the insides. The outer coating will probably chip off if you apply pressure with a pair of pliers.And the values can be confirmed with a good Ohm meter.

author: Lani
author_rank: Newbie
timestamp: February 28, 2024, 11:39:08 am
content: Thanks for the reply!! I've been looking into it a bit more and I think I found the type. I believe they are the Vishay CCF55 but they are metal film while these, to my eyes at least, look to be carbon film. The body and the leads are non magnetic which would point to carbon film wouldn't it?. But the datasheet says that the CCF are metal film.... strange considering the CCF55. They are indeed 1/4W (sorry about that). Broke a few in half too (pic below). So maybe they are a different manufacturer, like PRP, or BCEdit - Added CCF datasheet
LED Fluorescent replacements - Page 1
Forum section: electronics / general

author: westfw
author_rank: Super Contributor
timestamp: February 27, 2024, 09:06:06 am
content: So... I've been replacing fluorescent tubes with LEDs, and I have a relatively simple question that came up as I dissect some of the tubes that have stopped working.The tubes I have are rated 14W, contain 4 parallel chains of 28 ~3V white LEDs, and have simple electronics - a bridge rectifier, filter, and some current limiting resistors. Presumably the bulk of the current limiting is supposed to happen in the fluorescent ballast that you're supposed to leave in.So each LED should be running at approx 14/(28*4) = 0.125W, or about 40mA. That seems ... very reasonable; I thought consumer LED lamps regularly overdrive the LEDs? Am I missing something?(the LEDs are all mounted on a thin, single-sided glass/epoxy PCB, which slides into an aluminum channel. So while it's not very well attached, there is some heat-sinking as well.)(At least one of the failed lamps seems to have had the failure mode of the current-limiting resistors heating up enough to de-solder themselves (assuming I didn't break them during disassembly.) :-( )

author: tom66
author_rank: Super Contributor
timestamp: February 27, 2024, 09:53:35 am
content: Most LED fluros suggest removing the ballast to improve reliability.There will be either a capacitive dropper in the lamp or, more commonly nowadays, a small switchmode power supply. If you can't see an SMPS there, it might be a linear current regulator, though those tend to be more commonly used with long chains of LEDs to get near mains voltage.

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 27, 2024, 10:25:54 am
content: You have 112 (total) LEDs. That suggests around 100mw each. Depends on the ratings on the individual devices. 2835 footprint seems very common in white LEDs used for consumer lighting.

author: westfw
author_rank: Super Contributor
timestamp: February 27, 2024, 10:37:20 pm
content: QuoteHere (USA), there are explicitly at least three kinds of fluorescent replacements being sold:Type A: designed to be used with an existing ballast.Type B: designed to be directly wired to the AC supply (bypassing the ballast)Type AB: can be used either way.https://www.energyficient.com/2018/08/29/type-a-vs-type-b-led/
thin film resistor construction, conductor/pad attachment - Page 1
Forum section: electronics / general

author: metebalci
author_rank: Frequent Contributor
timestamp: February 27, 2024, 03:42:07 pm
content: I am trying to understand the thin film resistor construction in detail, I am not sure about a few points.There is a ceramic base like Al2O3. Then a resistive layer of something like NiCr or TaN is deposited over the ceramic. The thickness of resistive layer corresponds to a specific sheet resistance value, for example 50 ohm/sq for NiCr. Then, a particular pattern corresponding to the nominal value of the resistor is lithographically etched. I saw the video EEVblog #730 - Thin Film Resistor Networks and a few others, and they mention the conductive layer is also lithographically etched. So basically it is like a sandwich, there is the ceramic base, then resistive layer, then the conductive layer.Question 1: is the conductive layer always lithographically etched like this (so it stays over the resistive layer), or are there other methods ? Because in the simple figures, it does not look like there is a conductive layer over the resistive layer but only the conductive pads at the terminals, but I dont know with what other mechanism a conductive part like this can be attached there.Question 2: if the conductive part is continuous from the end of the resistive layer (not over, not lithographically etched over the resistive layer), then all the resistance is between the conductive pads. If the conductive part/layer is also lithographically etched on the resistive layer, then, I think, there is a resistive layer under it. Then it is like there is a 90 degree bend in the resistive film construction in the normal direction to the resistive film layer. Is this bend considered in the design of the pattern or is it corrected by trimming ? or what I am saying is wrong and something else is going on.Question 3: particularly if the resistor value is small, the required area or NiCr material is very small. Assuming a 0805 resistor, is there basically a very small resistive layer on the ceramic but a large conductive layer to the pads ? or the resistive layer is left as big as possible (although it is not needed for the power handling) and conductive layer is only close to the pads.After the pads are there, the resistor is laser trimmed while measuring it. Then depending on the manufacturer/model I think, there is some type of plating and/or coating and finally the terminals are coated with solder.I attached a few images from Vishay documents. The first video below shows the lithography process of both resistive and conductive (copper) layer.Edit: The second video is from Vishay, showing a bit detailed process. It seems part of what I am asking is called metal stack or metallization. Also this pagehttps://www.thinfilm.com/metallizations.htmlgives various options. Not 100% clear yet but I believe then multiple layers of metals are deposited (sputtered seems to be the technical term) on resistive layer and then etched one by one. Then a Ni plating is done before Sn/solder coating.
is there a 6 pin flat plug to 10 pin 5 x 2 for a Pickit2 reader - Page 1
Forum section: electronics / general

author: njsw88
author_rank: Contributor
timestamp: February 26, 2024, 12:17:42 pm
content: is there such a 6 pin flat plug to 10 pin 5 x 2 for a Pickit2 reader as per pic , so i can program a chip with the PICIT2 programmer , please help, and thankyou for any help

author: hans
author_rank: Super Contributor
timestamp: February 26, 2024, 12:21:52 pm
content: Yes; look for Microchip AC164110But expect to pay a lot for what is basically a cable with 6 wires between a pin header and a RJ11 socket. I made one myself on veroboard for probably 1$ and 5min of my time.

author: njsw88
author_rank: Contributor
timestamp: February 26, 2024, 01:50:14 pm
content: thankyou for the info
Winsource and Worldway reliability? - Page 1
Forum section: electronics / general

author: ricko_uk
author_rank: Super Contributor
timestamp: March 03, 2022, 01:37:27 pm
content: Hi,Has anybody had any experience with Winsource (www.win-source.net) and also with Worldway (www.worldwayelec.com) as a suppliers? Are they reliable?Thank you

author: thm_w
author_rank: Super Contributor
timestamp: March 03, 2022, 10:03:06 pm
content: https://www.eevblog.com/forum/manufacture/win-source/https://www.eevblog.com/forum/manufacture/win-source-electronics-good-to-go/https://www.google.com/search?q=winsource+eevblog+site:www.eevblog.com

author: AndyC_772
author_rank: Super Contributor
timestamp: March 04, 2022, 07:06:11 am
content: From a couple of weeks ago...Quote from: WinsourceIn our case they hiked the price 50% and the MOQ by a factor of 6.We gave them the feedback they requested - though probably not the feedback they wanted.

author: daqq
author_rank: Super Contributor
timestamp: March 04, 2022, 08:25:39 am
content: So, bait and switch. Got it.

author: Centmo
author_rank: Contributor
timestamp: March 17, 2022, 05:00:32 pm
content: Winsource: stay away. After ordering parts and paying for them in full, I was notified a week later that the parts had gone up in price 4x, and I would need to pay the higher price. I declined. On another order, one month after payment I emailed to ask when the parts would ship and was told that in fact they didn't have the stock so they would have to refund me. Finding this suspicious, I requested a quote for the same part from a different email address and was given a price 3x what I paid and was told they have plenty in stock and ready to ship in 2-3 days.Finally, a colleague of mine discovered that they had used a fake humidity card in an old shipment to us. Months after the bag had been opened, all of the dots were still blue while the card says that the dots would turn pink when the various humidity levels were exceeded. This is even more egregious than the ordering shenanigans.Very dishonest business, steer clear.

author: Howardlong
author_rank: Super Contributor
timestamp: April 29, 2022, 12:46:46 pm
content: Same old sh!t:Quote

author: up8051
author_rank: Frequent Contributor
timestamp: February 18, 2024, 10:45:08 am
content: After two years, nothing has changed.I was interested in the HD68B09EP chips (theoretically 1300 pieces in Win-Source stock).When submitting the inquiry, I indicated that I donot accept price changes after payment.And the answer I received:QuoteAt least I skipped the return payment cycle.BR JarekC

author: Howardlong
author_rank: Super Contributor
timestamp: February 23, 2024, 12:34:33 am
content: Quote from: up8051 on February 18, 2024, 10:45:08 amPrime unadulterated bullsh!tters.
An Atari 800 - 1.7mhz 6502 computer infering a neuronet. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: February 22, 2024, 04:18:54 am
content: Yes, someone wrote in basic for an Atari 800 (he says 800XL, but in 1979, it was a regular Atari 800). Though the neural net was trained on a modern 64bit computer, it is the Atari 800 running in Atari Basic doing the inferring, meaning running or playing back, the neural net.It appears to be a simple OCR (optical character recognition) net which looks at a low res single character B&W image, then reports back the 'number' which it has decoded from the bitmap.It is slow, but functional. If it were written in 6502 assembly, it probably would have run at least 25x to 100x faster as Atari Basic was not a compiled language, but an interpreted language which ran from the source code listing.Enjoy:
Request of help from UK members with a microscope - Page 1
Forum section: electronics / general

author: matt09
author_rank: Regular Contributor
timestamp: February 12, 2024, 04:14:33 pm
content: Hi All,I've been trying to replace a small FPC connector inside my phone which became damaged. I've given it a few different attempts now with various methods and while I do have a microscope, it's not the correct type for electronics rework (I have a confocal sample scope for bio-materials). I can get perfect alignment with the scope but due to the type, I don't have room to get any kind of hot air instrument over it to do the rework.Despite flux and good pre-worked pads the FPC seems to be too light in weight to flow down onto the pads and I can't apply any force without disturbing the alignment, which I then need the scope to realign without the hot air.. you see the issue.At this point I don't want to risk any further reheating of the board on failed attempts. The pads are ready, the board is clean and masked off so it should be minute or two with the correct microscope.I'd like to ask if anyone in the UK with the correct microscope would be kind enough to put the connector on the board if I post it out to them and supply a prepaid envelope for return?I already asked at a few phone shops but didn't find any that were doing this kind of rework.You will see I've been a forum member for 10 years now so I can assure you this isn't any kind of scam, I've attached an image (sorry the camera on the old phone I'm using is poor)Thanks,Matt

author: jc101
author_rank: Frequent Contributor
timestamp: February 12, 2024, 06:18:03 pm
content: Are you anywhere near Cambridge?

author: matt09
author_rank: Regular Contributor
timestamp: February 12, 2024, 06:53:06 pm
content: No I'm afraid not but it's a tiny board and easy to post.

author: slybunda
author_rank: Regular Contributor
timestamp: February 21, 2024, 07:20:15 am
content: where abouts are you?
How do I find a Bluetooth pairing code? - Page 1
Forum section: electronics / general

author: Don-308
author_rank: Newbie
timestamp: February 17, 2024, 05:01:33 am
content: So I have a Bluetooth enabled two way radio. A Yaesu FTM-10r to be exact. There were 2 versions of a Bluetooth board for it. First was a BU-1 then a BU-2. The difference was the 2 was a newer board that supported more device connectivity. I currently have the BU-1 installed due to the BU-2 is not available. I’m attempting to pair a Bose Bluetooth headset to it. Nowadays you usually don’t need a pairing code to pair to a device. This radio Bluetooth requires a pairing code in order to pair to the Bose headset. There is no way to set a code from the headset. I’ve contacted Bose asking if there is a default 4 digit pairing code. They never responded. On the radio I have tried all of the default codes that I know and several others. I’ve tried 0000, 1111, 2222, 1234, 0001, etc with no success.I would imagine there has to be a pairing code in order for the headset to connect to a phone or other device.Is there a way to find the code that the headset is sending out during the pairing procedure?Any ideas?Don.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 17, 2024, 11:23:47 am
content: Make sure they use the same kind of Bluetooth.BlueTooth (classic or BT) and the low energy BlueTooth LE (BTLE or BLE) are not compatible. They are both stamped with the same Bluetooth rune symbol, and both have the 'Bluetooth' word in their naming, but they use different data rates, different hopping frequency and different modulation type IIRC. This is not obvious in most laptops and mobile phones, because they can do both standards, but dedicated devices might not be able to work with any Bluetooth.Just a hunch, I don't know which kind of Bluetooth is used by the Yaesu modules, or by the Bosse headset.Assuming your devices are using the more recent 'low energy' Bluetooth, the key exchange (for pairing) can be either:OOBK (out of band key exchanging) which means the key is exchanges not by radio, but by other means. Either a fixed key, or a key sent by plugging the device into a PC, etc.password number 0...999999'JustWorks' mode (in which the password number is always '0')

author: tooki
author_rank: Super Contributor
timestamp: February 17, 2024, 01:55:17 pm
content: Quote from: RoGeorge on February 17, 2024, 11:23:47 amThe fact that they were able to test pairing codes means they use a compatible BT type. Devices that only support one type, of the wrong type to pair, can’t even see each other to attempt pairing.
How do some mobile phones camera manage to get ISO 409600? - Page 1
Forum section: electronics / general

author: hap2001
author_rank: Regular Contributor
timestamp: February 17, 2024, 03:50:47 pm
content: Hello.I just saw some Chinese cellphones that have camera with ISO 102400 or even 409600, which is the same as the famous Sony A7S series... How is that possible?Seems it's doing both pixel binning and multi frame stacking? So it cannot record video at that ISO?What's the "real" ISO of that phone camera?And what do you think the theoretical ISO limit for such a small sensor like 1/1.7-1/2.5?Thanks.

author: tooki
author_rank: Super Contributor
timestamp: February 17, 2024, 04:43:02 pm
content: I assume they achieve it the same way they achieve 20000mAh 18650 lithium ion batteries: by lying.Ok, it’s not exactly the same: you can boost the gain on a tiny sensor the same as on a big one. But the noise will be much, much worse. So the resulting images will either be way noisier than the already super noisy images from the A7S at that ISO, and/or they’ll apply even more severe noise reduction, which will render them with even more watercolor effect than the already very water effect riddled images of the A7S at that ISO.Yes, it’s possible for different noise reduction algorithms to produce better results than others, but miracles are not possible.Digital sensors do not have a “native” ISO. The ISO is basically a gain setting for the readout amplifiers. Nor is there a real or theoretical limit to ISO as such; it’s just the tradeoff of signal to noise. Eventually your signal disappears into the noise. Before that happens, you choose a balance of sensitivity to noisiness.

author: voltsandjolts
author_rank: Unknown
timestamp: February 17, 2024, 04:58:06 pm
content: Don't know what ISO it achieves, but my phone is incredible at taking photos in low light. It must be stacking multiple images, shifting each of them to line them up as the camera moves a bit, getting an exposure of several seconds without the motion blur.
I Landed a Rocket like SpaceX - Scout F by BPS.space - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: February 18, 2024, 08:08:34 am
content: Well I've come around this channel -https://youtube.com/@BPSspaceAnd since some times we talk about SpaceX and space around here, how about what smaller people are able to do?https://youtu.be/SH3lR2GLgT0He has a ton of other projects, as developing his own flight computer with pirotecnics control, own formulation of solid rocket fuel, etc.Very nice and really deserves some views. And no I'm not associated with him or have any contact with the person itself. It was just the times were the YouTube algorithm sends you something that it is ready enjoyable to watch (read it as the algorithm working properly).

author: iMo
author_rank: Super Contributor
timestamp: February 18, 2024, 09:34:34 am
content: Yep, the guy is talented, indeed, I've been watching him for a longer time already..Hopefully he will stay careful with elaborating his engines, the rocket science is dangerous..

author: Black Phoenix
author_rank: Super Contributor
timestamp: February 18, 2024, 02:30:36 pm
content: Quote from: iMo on February 18, 2024, 09:34:34 amWell I was surprised. Remember that I'm not from the US so I don't know the laws but I always known people were making their own rockets but I didn't know that people were allowed to make rockets who can reach the 100Km+ altitude or even develop/test their own solid propeller fuel to be honest.I always thought (mostly didn't know) that was something only restricted to companies as Blue Origin, Space X and Virgin Galactic and Government entities as NASA, ESA and JAXA and the military contractors/arm and normal people were limited into altitude, design, thrust and fuel.
Why Synopsys Bought Ansys (For $35 Billion) - Thermal Design Simulation for Chip - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: February 16, 2024, 05:05:51 pm
content: https://youtu.be/PcINzL2HFZ0Another great video from Asianometry with a insign in how thermal simulation is used in semiconductors.
Good Engineerin or Coincidence? - Page 1
Forum section: electronics / general

author: watchmaker
author_rank: Unknown
timestamp: February 16, 2024, 02:06:09 pm
content: The front lens panel of my dash cam popped off the other day. The Li battery swelled and popped it out of its keepers.Either it was a great design decision to place the battery under that panel so that when it failed, it would provide an unmistakeable warning Or, just luck. I prefer to believe the former (I am an optimist).Now I just have to figure out how to get rid of the battery. Maybe shoot it with a BB gun??

author: Zero999
author_rank: Super Contributor
timestamp: February 16, 2024, 02:13:37 pm
content: Luck.Do you intend to repair it? It should be fairly easy to find a replacement.Regarding disposal: contact your local authority if you're feeling conscientious, otherwise toss it in the trash. It's much smaller than the lithium ion batteries in single use vapes, which routinely get dumped on the street or in a park, where they end up in the water course.

author: AVGresponding
author_rank: Super Contributor
timestamp: February 16, 2024, 02:13:39 pm
content: I would favour connecting it to some suitable power supply, say, 60V @ 10AObvs outside and at a safe distance...

author: Stray Electron
author_rank: Super Contributor
timestamp: February 16, 2024, 03:06:21 pm
content: How old is your dash cam? I keep one of my LG cell phones for over fifteen years and I had to replace the battery twice after it swelled up like that. In my case, the battery swelled so much that it popped the battery door off, but the battery was still working.FWIW I finally bought a new phone when all of the TelCos REQUIRED 5G capable phones a few years ago but I still have the old phone and even though it won't connect to the current network, it still works. IIRC I bought the phone in 2001.
FAA secret plan to reduce number of white pilots for more gender diverse pilots! - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 14, 2024, 12:23:27 am
content: Yum, nice stuff. For those that think DEI is a conspiracy theory, you can have a look there:https://nbaa.org/about/diversity-equity-inclusion-dei/

author: Halcyon
author_rank: Unknown
timestamp: February 14, 2024, 12:28:12 am
content: You completely lost me as soon as I saw it was Matt Walsh. The guy is an absolute belter with some very backward views.

author: Benta
author_rank: Super Contributor
timestamp: February 14, 2024, 12:29:22 am
content: Is this really the place for Breitbart/Bannon/Trump/MAGA alumni conspiracy stuff?I hope not.There are plenty of other sites for kooks.

author: wraper
author_rank: Unknown
timestamp: February 14, 2024, 12:33:51 am
content: Boeing is not better (no wonder their planes have missing and loose screws) and FAA is also hiring people with severe mental disabilities.

author: wraper
author_rank: Unknown
timestamp: February 14, 2024, 12:54:44 am
content: Here is a document directly from FAA bragging all about diversity (read racial discrimination) and equity (= inequality) starting from page 15.https://www.faa.gov/sites/faa.gov/files/Flight%20Plan%2021_2022_0.pdfAnd here is more DEI bullshit from FAAhttps://faadeia.vfairs.com/QuoteQuotehttps://www.faa.gov/about/office_org/headquarters_offices/acr/eeo_training/airport_civil_rights_training_conference

author: rsjsouza
author_rank: Super Contributor
timestamp: February 14, 2024, 01:13:01 am
content: This DEI crap is a plague, especially in such mission-critical environments. Unfortunately the regular activists of the large media will be quite squirrelly to report on such things extensively, so the "loony conspirators" will be the ones bringing the necessary attention to such non-mainstream subjects, as it has been happening for the last four years.

author: wraper
author_rank: Unknown
timestamp: February 14, 2024, 01:16:15 am
content: From FAA themselves

author: MT
author_rank: Super Contributor
timestamp: February 14, 2024, 01:23:14 am
content: The FAA program forpeople with disabilityare in it self quite excluding and contradicts their own agenda!QuoteQuote from: wraper on February 14, 2024, 12:54:44 am

author: amyk
author_rank: Super Contributor
timestamp: February 14, 2024, 01:25:33 am
content: It's far from "secret".

author: EEVblog
author_rank: Unknown
timestamp: February 14, 2024, 01:55:11 am
content: Locked.Please do not start off-topic political threads like this.
True Cost Of Mining Electric Car Battery Metals. - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 13, 2024, 04:40:23 am
content: Fun, looks like one of the few jobs left for humans when we have finally replaced almost everyone by machines will be mining stuff to fuel the machines, because it's inconvenient for machines to do that efficiently. In particular, kids do particularly well thanks to their small and agile bodies. We'll also have destroyed what's left of ecosystems, at least those that we don't have any immediate and obvious use for, because, why not. They just emit CO2 anyway, which is admittedly bad."Il ne faut pas afoir peur!"

author: MT
author_rank: Super Contributor
timestamp: February 13, 2024, 04:32:24 pm
content: Quote from: SiliconWizard on February 13, 2024, 04:40:23 amYou suggest this dude have something to do with it?
Help me shop for a new optical drive? - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: February 13, 2024, 12:11:08 am
content: Hi all-I'm ripping the last of my optical collection and my old drive just died. Suddenly I need a new external USB optical drive, of all things. It needs to play everything up to Blu-Ray but does not need to burn anything.I have not kept up with this product category and if anyone can recommend a specific make & model to purchase I would be grateful.Thank you very much.

author: Halcyon
author_rank: Unknown
timestamp: February 13, 2024, 12:18:34 am
content: The LG ones are pretty decent:https://www.lg.com/au/burners-drivesYou generally won't find drives that aren't burners as well these days.

author: jonpaul
author_rank: Super Contributor
timestamp: February 13, 2024, 11:53:10 am
content: Samsung DVD/CD/BR ext USB $15..30j
Digikey Robot Protocols? - Page 1
Forum section: electronics / general

author: DLE
author_rank: Contributor
timestamp: February 12, 2024, 02:21:46 pm
content: Is anyone else struggling with the Digikey website? It has become nearly unusable for me with having the "Press & hold" to confirm I'm not a robot multiple times for a single BOM. Regularly, it seems to get stuck and just keeps popping up the same message. I am I alone in this?

author: tooki
author_rank: Super Contributor
timestamp: February 12, 2024, 05:36:04 pm
content: I'm not seeing it right now, but have in the past.Are you running ad blockers? I have occasionally see those go haywire and block something used to remember that you "passed" verification.

author: Foxxz
author_rank: Regular Contributor
timestamp: February 12, 2024, 10:11:05 pm
content: I get it alot. No idea why. Super annoying.

author: watchmaker
author_rank: Unknown
timestamp: February 12, 2024, 10:12:15 pm
content: I just used it yesterday with no issue with the robot. I am using Chrome with full ad blocking, Malware bytes and uBlock.

author: DLE
author_rank: Contributor
timestamp: February 13, 2024, 01:59:49 pm
content: Weird, no adblockers right now and running Chrome. I may mess around with my bitdefender settings maybe that is messing with things. It gets to the point it just gets stuck. I've sent a few ref ids to their support team. Thanks for the quick feedback all!
Dismantlement of Nuclear Weapons by the Department of Energy - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: February 14, 2024, 01:01:44 pm
content: Obviously a lot they are not going to show but still interesting to watch.

author: xrunner
author_rank: Super Contributor
timestamp: February 14, 2024, 01:08:25 pm
content: Hopefully not like this -

author: eutectique
author_rank: Frequent Contributor
timestamp: February 14, 2024, 01:31:35 pm
content: Quote from: xrunner on February 14, 2024, 01:08:25 pmWhich reminds me

author: tszaboo
author_rank: Super Contributor
timestamp: February 14, 2024, 01:40:46 pm
content: Quote from: xrunner on February 14, 2024, 01:08:25 pmOr this (brilliant television series BTW):

author: coppercone2
author_rank: Super Contributor
timestamp: February 14, 2024, 10:03:41 pm
content: Quote from: xrunner on February 14, 2024, 01:08:25 pmthis one happens to use some kind of slurry explosive that settles so it keeps it spinning like a cement truck. Ever since I read about the nuclear bomb that used a traditional fuse (like bugs bunny), nothing in james bond seems unrealistic to me. So a mad man used a electromechanical timer (made by a evil swiss watch maker) and unstable slurry explosive. OK, at least its not a goverment funded project that put fireworks fuse inside of a atom bomb!The texture on that aluminum base plate is similar to the picture someone had here of some radio equipment too lol

author: BrianHG
author_rank: Super Contributor
timestamp: February 15, 2024, 01:19:15 am
content: Quote from: Homer J Simpson on February 14, 2024, 01:01:44 pm@3:56 - "It is virtually impossible for an accident to result in a nuclear detonation."Ohhh the irony of that line.

author: schmitt trigger
author_rank: Super Contributor
timestamp: February 15, 2024, 02:15:59 am
content: Quote from: tszaboo on February 14, 2024, 01:40:46 pmThe runaway bomb with a 7-segment red LED display ticking away the seconds, must be one of Hollywood’s most overused cliches.So much so, that the other day the living room’s TV was showing a movie that nobody was really watching. The bomb scene came up. My 3-year old granddaughter, who was playing in the couch with her dolls, glanced at the screen and yelled at the top of her little lungs: “THE RED WIRE! CUT THE RED WIRE!!”

author: TizianoHV
author_rank: Regular Contributor
timestamp: February 15, 2024, 12:58:46 pm
content: It is virtually impossible for an accident to result in a nuclear detonation, just unplug it!

author: schmitt trigger
author_rank: Super Contributor
timestamp: February 15, 2024, 08:26:33 pm
content: The Leslie Nilsen - OJ Simpson duo were masters of the deadpan comedy.
Reinforce springiness of the brush contacts of a DMM rotary switch - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 11, 2024, 09:50:29 am
content: Can the brushes in a DMM rotary switch be "steel quenched"?(not sure if that's the correct term, want them to press harder on the PCB contacts, and be more elastic)I have a cheap clone of an my64 DMM (3.5digits) but with absolutely superb LCD visibility and instant power up. Other much better and more expensive DMMs I have are absolutely horrible in display readability, speed and battery consumption.I don't know what happened with that type of crystal-clear 7 segments only type of LCD, and with the black blob die straight on PCB stile of ICs, or why they went extinct, but I digress.The problem with this my64 clone I have is bad contacts in its rotary switch. Under the microscope, the contact springs and the PCB plots look clean. I suspect, the cause is that the mobile brushes lost their springiness, or didn't have enough of it.Last time I've open it, some years ago, cleaning with izopropil 90% didn't fix it (contacts were clean already). Bending the brushes a little more, made it work a few more years, during which years, it slowly become more and more unreliable.If iron can be hardened into steel by adding carbon then fast crystallization (for example, turn an iron nail red hot with a torch, then throwing it in a jar of water will harden the metal), would that work, too, for the brush contacts alloy?Would prefer very much to keep this DMM, any other advice for how to fix the rotary contacts?

author: ebastler
author_rank: Super Contributor
timestamp: February 11, 2024, 10:05:21 am
content: Beryllium copper is the "proper" material for spring contacts, although I don't know whether there is an easy way to confirm that this is what is actually used in your meter. Heat treatment and annealing are indeed used to strengthen beryllium copper:https://materion.com/about/new-at-materion/in-our-element-heat-treating-copper-beryllium-partsNot sure whether it's a good idea to try and do that with the fully formed contacts in your meter though; it might be an effective way to ruin them too... Depending on how the contacts are arranged in the meter, maybe it is possible to insert a thin layer of springy/spongy material above them to help push them down towards the PCB?

author: coppercone2
author_rank: Super Contributor
timestamp: February 11, 2024, 10:55:45 am
content: no you need to work harden that material (brass or better bronze). it hardens from that. its not heat treated to spring form. brass is the lowest quality choice, get bronzeyou could bend like spring bronze sheet cuttings to proper shape and solder them in place with a big lap joint maybe. or remake the whole part by etching bronze sheetthey are manufactured by stamping it into place and I think you can get spring bronze/brass sheet too but it needs to be formed. I think agressive stamping gives it the correct parametershttps://www.mcmaster.com/products/spring-tempered-bronze/i imagine beating it into a die with hammer and special anvil might help (like repeditive)
ATTEN MS-500 review anyone (or just APS22-5A) - Page 1
Forum section: electronics / general

author: carlberg
author_rank: Newbie
timestamp: February 08, 2024, 02:15:23 pm
content: Hi,Thinking of buying a soldering station with hot air gun and I was first looking at the ATTEN ST-8902D.But then I learned that soldering iron can not be replaced with tweezers.. not that it as very important,but.. why not buy something that I will be able to build on and to be able to use tweezers would be nice..So instead I looked at the MS-300 and MS-500.MS-300 has the "old technology" type of soldering iron and the MS-500 has the "new technology".(Note; that I used the quotations when talking about soldering irons types..)That leaves MS-500..Found reviews for the soldering station and hot air gun..ATTEN ST-1509 Soldering StationATTEN ST-862D Hot Air Gun StationAlso the tweezers (N9100)https://youtu.be/7Jzx2LjOxfcBoth soldering station and hot air gun has got pretty good reviews, haven't found anyone that trashes them...but I cant find anyone that have tested the Power Supply (APS22-5A)Has anyone out there bought the MS-500 or just the APS22-5A and are willing to share your opinion?

author: thm_w
author_rank: Super Contributor
timestamp: February 08, 2024, 11:11:24 pm
content: 3-in-1s should generally be avoided. In this case its just 3 devices screwed together, so unless its cheaper there is no reason to get it:MS-500 = $440 shippedATTEN St-862D = $180 shippedATTEN ST-1509 = $170ATTEN APS22-5A = $170So at the current price its like getting the PSU for ~$100. I would not pay $100 for that PSU, and I'd rather have a JBC clone for $170, but its up to you.

author: carlberg
author_rank: Newbie
timestamp: February 09, 2024, 03:33:48 pm
content: Agree, the APS22-5A PSU dont look that impressive.. or actually looks kind of crappy.Just liked that they fit nice together and when I more or less get all three for same price as two.. so why not.I was hoping someone would say that the APS22-5A is; "great!" or "not bad at all"..darn it.Edit: just saw something at atten.com, "coming soon"..https://dedjh0j7jhutx.cloudfront.net/1523686242733039616%2F058bd89a-0651-424d-9175-5d307e5e42c1.webpPlease say its a better PSU!
Veritasium on blue LEDs - Page 1
Forum section: electronics / general

author: aargee
author_rank: Frequent Contributor
timestamp: February 09, 2024, 01:52:16 am
content: See BrianHG’s post, beat me to it.

author: fourfathom
author_rank: Super Contributor
timestamp: February 09, 2024, 03:54:42 am
content: But here's the link anyway:Very interesting!

author: schmitt trigger
author_rank: Super Contributor
timestamp: February 09, 2024, 04:10:59 am
content: Nobel Prize winners; for the blue LED:https://www.nobelprize.org/prizes/physics/2014/press-release/

author: Smokey
author_rank: Super Contributor
timestamp: February 09, 2024, 04:19:13 am
content: Other thread:https://www.eevblog.com/forum/chat/the-race-and-bumpy-road-to-create-the-blue-led/msg5323463/#msg5323463(This one has more replies)
Doppler shift vs velocity - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: February 08, 2024, 02:13:01 am
content: Say there was a radio transmitter some distance away that is transmitting on 300MHz. No modulation. Light travels at ~300 million metres per second and electromagnetic waves are coming toward me at 300 million Hz with a wavelength of 1 metre. If I walk toward the transmitter at 1 m/s will I now measure an apparent frequency of 1Hz greater than if I remained stationary?

author: CatalinaWOW
author_rank: Super Contributor
timestamp: February 08, 2024, 02:17:18 am
content: Close (to many digits) asI remember the physics from several decades ago. At this speed you can ignore time dilation.

author: ejeffrey
author_rank: Super Contributor
timestamp: February 08, 2024, 05:45:57 am
content: Yep. The way you described it is a little hard to measure, you need frequency accuracy of a few parts per billion. You can do that with an OCXO or atomic standard, but that is bulky and power hungry. Instead if the transmitter also has a receiver it can monitor the signal reflection and it will see a shift of 2 Hz. Now it's comparing against itself and the 2 Hz shift is easily resolvable. The beat note is pretty low frequency. You can still resolve it but that can make for a slow measurement and be limited by 1/f noise in a simple homodyne receiver. Bump your transmit frequency up to 30 GHz and now the signal is at 200 Hz, and now you have a radar speed detector.

author: jbeng
author_rank: Regular Contributor
timestamp: February 11, 2024, 03:28:58 pm
content: The Wiki page on Doppler radar may be of some help here in determining the difference in frequency of an RF signal which has been reflected from a moving object. Look in the "Frequency Variation" section a short way down the page for some formulae on this.Wiki link (https://en.wikipedia.org/wiki/Doppler_radar)

author: m k
author_rank: Super Contributor
timestamp: February 11, 2024, 04:35:58 pm
content: Depends what you mean with apparent.There in no other frequency that is more real.We know that energy has strength and we can measure it, even photon.But energy has also a shape of some sort and measuring that we must combine it with time.We can also measure no energy from a point where we empirically know the energy should be.Is our measuring apparatus then failing.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 11, 2024, 06:22:44 pm
content: Quote from: ejeffrey on February 08, 2024, 05:45:57 am
Fluke 289 can't connect to FlukeView - Page 1
Forum section: electronics / general

author: Демян
author_rank: Newbie
timestamp: February 06, 2024, 07:38:40 pm
content: Hii,I've lost my IR cable but I have usb uart at ft232rl so I made fastly a new one and there's problem.When I connected scope there's normal signals at Tx and Rx but no connection to meter, sometimes there's blinking the connection icon on meter but still nothing on pc.Do you have any ideas why it's not working?I've installed drivers from ftdi website.Sorry for my English.Best regards

author: asis
author_rank: Frequent Contributor
timestamp: February 07, 2024, 12:15:43 pm
content: Hi,Try downloading FT Prog and pasting in the VID/PID parameters.

author: Демян
author_rank: Newbie
timestamp: February 08, 2024, 10:37:36 pm
content: Hm, I have the same parameters as you by default.Today I had some time and checked module using Termite.So module is working when I short Rx and tx and send some data I receive the same data but when I take mirror or take the ir diode next to receiver sometimes it's working and sometimes it doesn't ( on scope it was losingsome bits - one or two)I think that the phototransistor is bad.I've bought few new IR transistor so I'll check it soon ( when I'll receive it)I don't have any other idea why it's acting like this