hybridfree/eevblog-posts huggingface dataset:
B2spice OPA2189 parameterized, need help. - Page 1
Forum section: electronics / general

author: sourcecharge
author_rank: Regular Contributor
timestamp: August 27, 2024, 04:04:12 am
content: Hello,I'm trying to make a parameterized version of the OPA189/OPA2189 from the datasheets.B2 spice has a parameterized opamp that you can plug in values.I can't seem to understand how I can get the frequency of the poles (zero, 1st, 2nd, 3rd, & 4th) from the datasheet, and I also need the "dc differential mode gain" which doesn't seem to be in the datasheet.Also, I know this is not probably either but which type of "input (type n or p)" does the opa189/opa2189 most likely resemble?Any help would be appreciated.Thanks.

author: sourcecharge
author_rank: Regular Contributor
timestamp: August 27, 2024, 07:29:32 pm
content: So, apparently, I'm not the only one that doesn't know how to come up with the pole frequencies from the datasheets.At least I don't feel so bad now.

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 27, 2024, 09:24:07 pm
content: Not that it really answers your question, but why don't you use its official Spice model:https://www.ti.com/product/OPA189#design-tools-simulation

author: sourcecharge
author_rank: Regular Contributor
timestamp: August 28, 2024, 03:07:35 am
content: It doesnt work in LTspice, after the pspice conversion. I've never used tina or pspice.I would be happy if someone would just give me the pole frequencies.Maybe if someone knows how to read the offical model file and get them from it?Thanks for the sugestion.
Rohde & Schwarz UDS 5 - Your thoughts - Page 1
Forum section: electronics / general

author: bat
author_rank: Regular Contributor
timestamp: August 19, 2024, 02:24:46 pm
content: Hi y'allI recently got a free Rohde & Schwarz UDS 5. I don't currently have the time to try it and play with it so I was wondering if you guys had experience using it. I'm sure it's a great meter but to me, my trusty 34401A will do a better job

author: pdenisowski
author_rank: Super Contributor
timestamp: August 19, 2024, 05:08:29 pm
content: Wow - nice score!

author: bat
author_rank: Regular Contributor
timestamp: August 20, 2024, 10:15:10 pm
content: Indeed.I even managed to get myself 1 RF R&S mug ! those are so nice

author: pdenisowski
author_rank: Super Contributor
timestamp: August 21, 2024, 10:52:03 am
content: Quote from: bat on August 20, 2024, 10:15:10 pmIs it this one?

author: bat
author_rank: Regular Contributor
timestamp: August 26, 2024, 10:35:11 am
content: Your video is in private mate, here's a pic I took of the mug i'm talking about

author: pdenisowski
author_rank: Super Contributor
timestamp: August 26, 2024, 03:10:50 pm
content: Quote from: bat on August 26, 2024, 10:35:11 amSorryFixed it now. And yes, same (or very similar) mug

author: bat
author_rank: Regular Contributor
timestamp: August 27, 2024, 07:06:49 am
content: Nice !I need to add this mug to my collection

author: ftg
author_rank: Frequent Contributor
timestamp: August 27, 2024, 07:13:37 am
content: Quote from: bat on August 26, 2024, 10:35:11 amOh, a newer style. Mine only has the R&S logo at the bottom, nothing inside or on the sides.
Personal development ideas for Entry level controls engineer - Page 1
Forum section: electronics / general

author: am1
author_rank: Contributor
timestamp: August 26, 2024, 04:33:22 pm
content: Hi All.I am a controls/embedded systems engineer that has been out of college and working as for the past 1.5 years. I still consider myself entry level and don't feel as confident in my knowledge and skills as I wish I was and would like to change that. I work at a biotech start up with no other engineers in my field that I can learn from. It has been great for hands-on experience and for throwing me into the deep end to learn things for myself on my projects, but it often times feels like it is taking me way too long. I don't want to feel "behind" or feel like I have a handicap when it comes to succeeding in my role and future roles and to grow in this field. What are some examples of programs or supplemental projects or opportunities I can pursue for personal development for an entry level engineer looking to advance? Are there any courses, conferences, trainings, etc that you participated in that you really valued from and would recommend? Ideally not too expensive, but i'm open to hearing any suggestions. Thanks!
Smd code to part number - Page 1
Forum section: electronics / general

author: esinior
author_rank: Contributor
timestamp: August 20, 2024, 09:13:08 am
content: Hii have a smd part with probably mark "QO 11" or "Q0(zero) 11" on it, and its package is SOT89, i doubt its KTB1260 PNP transistor, but in measuring with diode mode of multimeter it shows number 1.4 between emitter and collector pins and its not open circuit, and .59 from collector to base and .8 from emitter to base , and these numbers doesn't match a pnp transistor, i couldn't find any part number and datasheet for it, does anybody have information for that part number?I've attached pics of this partThanks

author: thm_w
author_rank: Super Contributor
timestamp: August 20, 2024, 11:35:31 pm
content: Cross posted on 4 other sites:https://community.st.com/t5/power-management/smd-code-to-part-number/td-p/710312https://electronics.stackexchange.com/questions/722851/identify-smd-part-marked-qo-11-or-q0-11-zerohttps://forum.allaboutcircuits.com/threads/smd-code-to-part-number.202560/https://www.edaboard.com/threads/smd-code-to-part-number.412116/

author: fzabkar
author_rank: Super Contributor
timestamp: August 21, 2024, 12:22:50 am
content: In the absence of a photo of the PCB to provide context, could it be a PNP Darlington pair with a base resistor???Something like this, but without the C-E diode:https://www.mouser.com/datasheet/2/916/BST62-3372616.pdf

author: esinior
author_rank: Contributor
timestamp: August 26, 2024, 11:19:20 am
content: Thanks, but it's more probable to be shunt regulator i think
housing for technical people? - Page 1
Forum section: electronics / general

author: src1989
author_rank: Contributor
timestamp: August 24, 2024, 06:47:55 pm
content: sorry if this is wayyyy too off-topic, but i was wondering if there are groups/forums for technical people to search for rooms/flats to rent?basically i've been offered a technical job in london and need to find somewhere to live, ideally with a similar type of person (so there's a theoretically higher chance of us getting on with each other). i know there are groups for renters who fall into the autistic or lgbt+ categories so just wondered about this...

author: coppercone2
author_rank: Super Contributor
timestamp: August 24, 2024, 07:02:46 pm
content: there is another side to this, if your quiet, if you get someone really social, you can get lucky and have them be out all day. some people are like that.Sometimes the worse arguments can come from like minded people. Two people working from home might totally suck for instance. Like the guy that only comes home once a week when a girl kicks him out, and chances are he passes out walking through the door.100% different from you but a great room mateAnd for work, those people are more likely to travel and stuff, meaning more time alone. Like business people might be out 30% of the time on business. And the only thing they think about you is "at least its quiet in my house."I think you need to be incredibly open minded about shared living arrangements, chances are, your not gonna find what your looking for. What you don't want is someone passed out infront of a bong in your house every hour of the day while "working"
Maxim -> ADI -> plughole - Page 1
Forum section: electronics / general

author: peter-h
author_rank: Super Contributor
timestamp: August 22, 2024, 03:00:17 pm
content: No way to email them anymore (not for years) and when trying to raise a ticket (the only way) I get an email back withhttps//suppport.analog.com/en-US/customer-serviceSpot the typo... clearly nobody cares.

author: Nominal Animal
author_rank: Super Contributor
timestamp: August 23, 2024, 12:37:38 pm
content: Quote from: peter-h on August 22, 2024, 03:00:17 pmI spot two: no colon and an extra p. Which itself sounds like a joke about human digestive processes.
From Raw Crystal to Crystal Oscillator - Crystals go to War in 1943 - Page 1
Forum section: electronics / general

author: MK14
author_rank: Super Contributor
timestamp: August 22, 2024, 04:12:40 am
content: Repost:https://www.eevblog.com/forum/rf-microwave/from-raw-crystal-to-crystal-oscillator-crystals-go-to-war-in-1943/msg5082400/#msg5082400
How do I obtain a printed edition of the Red Book Philips/Sony CD standard? - Page 1
Forum section: electronics / general

author: MindBender
author_rank: Regular Contributor
timestamp: August 22, 2024, 07:35:32 am
content: Hi guys,People collect the strangest things, for the strangest of reasons. And for some reason I convinced myself that I need to own a printed edition of the Red Book Philips/Sony CD standard. Obviously not for its contents, but for the mere sake of owning one.Unfortunately, they're not easy to find, probably because they're propriety. After evenings of searching, I couldn't even find a photo of it, so I don't even know if it is actually red. Do you guys have any ideas?Cheers,Robert.

author: MK14
author_rank: Super Contributor
timestamp: August 22, 2024, 08:08:09 am
content: This includes a picture of it. It is not actually a book as such (depending on your definition), either.https://www.youtube.com/bcE5eQR8R3Ahttps://en.wikipedia.org/wiki/Rainbow_Books

author: Someone
author_rank: Super Contributor
timestamp: August 22, 2024, 08:09:11 am
content: https://www.lscdweb.com/ordering/cd_products.html

author: MindBender
author_rank: Regular Contributor
timestamp: August 22, 2024, 08:25:22 am
content: Quote from: MK14 on August 22, 2024, 08:08:09 amSo it's a set of red binders; That makes sense. Thanks for the video; It shows what's on the cover and those are good terms to search for.

author: MindBender
author_rank: Regular Contributor
timestamp: August 22, 2024, 08:28:32 am
content: Quote from: Someone on August 22, 2024, 08:09:11 amInteresting, but they seem sell PDFs. If they sell printed copies, they'll probably print one out and put it in a binder; Not really the same, but I'll drop them a mail. I don't think they'll sell me anything anyway, because of their NDA requirements.

author: MindBender
author_rank: Regular Contributor
timestamp: August 22, 2024, 02:11:46 pm
content: For whomever is just interested in the information within, the Red Book standard and most of its colorful friends can be found on the Internet Archive:https://archive.org/search?query=subject%3A%22rainbow+books%22.
Component Identification - Page 1
Forum section: electronics / general

author: DCJ
author_rank: Newbie
timestamp: August 20, 2024, 07:41:23 pm
content: Hi could any one help with identifying this component please. It is on a gas detection /monitor circuit board. To me it looks like the part number is 1100. It is a 6 pin SMD.My apologies the pictures are very poor.I believe the bottom row of numbers/letters is J1K7D

author: fzabkar
author_rank: Super Contributor
timestamp: August 20, 2024, 08:23:54 pm
content: https://www.relmon.com/en/mobile/index.php/welcome/download/114.html(datasheet for MS1100)https://ae-pic-a1.aliexpress-media.com/kf/S6e8e38ececcb41f8b721b46218f702339.jpg(photo)

author: DCJ
author_rank: Newbie
timestamp: August 20, 2024, 09:38:21 pm
content: Wow fzabkar thank you so much I had been looking for this for some time.
Spotted on Face book - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: August 19, 2024, 04:38:10 pm
content: Saw this on FB today and as its an Australian company or was?

author: AVGresponding
author_rank: Super Contributor
timestamp: August 19, 2024, 05:09:57 pm
content: Yes, an Aussie electronics chain, Dave has done a few vids featuring them

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 19, 2024, 08:27:08 pm
content: "Floats on water". Uh, ok.

author: Stray Electron
author_rank: Super Contributor
timestamp: August 19, 2024, 09:49:34 pm
content: Quote from: SiliconWizard on August 19, 2024, 08:27:08 pmSince they're in the southern hemisphere and not the northern one they must mean on the bottom side of the water, not the top. It's all relative, right?

author: Halcyon
author_rank: Unknown
timestamp: August 20, 2024, 05:17:49 am
content: Yep, Dick Smith (both the person and the company) are still around, although the company is a shell of what it used to be.There's an article here about it:https://en.wikipedia.org/wiki/Dick_Smith_(retailer)They used to compete with stores like Tandy/RadioShack, but these days they just sell consumer electronics, appliances, white-goods, clothing etc...Dick Smith the person is here:

author: Brumby
author_rank: Unknown
timestamp: August 20, 2024, 05:56:43 am
content: * Awwww SNAP! *Yes, the retail chain was a big hit. Starting up in the late 60's, the history is quite a story.https://en.wikipedia.org/wiki/Dick_Smith_(retailer)Aside from the business, Dick Smith the person is quite switched on with a broad streak of adventure and a touch of mischief. He is quite the entrepreneur and advocate for many causes, with a strong support for Australia. He is, dare I say, an Australian icon.Perhaps the greatest example of the adventurer was his 1982-83 solo flight around the world - in a helicopter. This was quite the challenge in navigation as it was completedbeforeGPS was made available for civilian use.Years ago, he ran a competition with an oscilloscope as the prize - an Hitachi 15MHz 2 channel CRO .... and I won it.(Yes, I still have it and, yes, it still works.)

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 20, 2024, 06:34:06 am
content: Didn't Dick Smith even sell their own computer back in the 80s?
Howard Electronic Instruments Reputable? - Page 1
Forum section: electronics / general

author: MrG
author_rank: Newbie
timestamp: August 19, 2024, 05:03:52 am
content: Hey All,Long time lurker but first post. My apologies if this is in the wrong area.I’m a mastering engineer in the audio/music biz, and I work on and build things frequently.I’m looking to get a JBC CD-1BQF, and have come across Howard Electronic Instruments, who seems to have a great deal on one with a tip included, but also generally has a lot of great kit. I’ve found nothing about their reputability in my searches.Can anyone shed any light on if they’ve had positive/negative interactions with Howard Electronic Instruments/HEI please? Thanks much in advance.All best,MG

author: deadlylover
author_rank: Frequent Contributor
timestamp: August 19, 2024, 12:06:42 pm
content: Bought my JBC from them 11 years ago (howardelectronics.com), haven't used them since so I can't comment on the support, good luck.

author: MrG
author_rank: Newbie
timestamp: August 20, 2024, 01:32:21 am
content: Thanks @deadlylover - good to know.I spoke to HEI rep on the phone today and it was odd. They said they took PayPal on the site, and then it was only credit card when I got through to checkout… And generally the confidence level was not great.On that note, I’m reading some things about JBC’s quality dropping as of late, and JBC’s North American phone number from their site is a dead end/out of service. Just really bizarre. Tough to know who to trust I guess with this particular purchase.All best,MG
NiMH battery packs - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: August 19, 2024, 01:48:44 pm
content: I received two battery packs an notice they are both under 1.2v upon measuring them.I was told many years that if they are below 1.2v near about the 1v range for a long period of time they might not fully charge up again during charge and discharge cycling.One pack shows 7.27v7.27v /7 cells =1.03vThe other pack 7.937.93V /7 cells =1.13vIs this not good or am I being paranoid?

author: wraper
author_rank: Unknown
timestamp: August 19, 2024, 01:56:09 pm
content: QuoteThat's some BS.

author: tom66
author_rank: Super Contributor
timestamp: August 19, 2024, 01:58:00 pm
content: Prolonged storage at very low voltages might damage the cells but you've little to lose just trying to charge the pack up. NiMH cells are very safe and thermal runaway is essentially impossible, especially for small cells like these.A bigger problem is if one cell in the pack is weak, during usage that cell can be reverse-biased, which does permanently damage it.

author: wraper
author_rank: Unknown
timestamp: August 19, 2024, 02:00:38 pm
content: Quote from: tom66 on August 19, 2024, 01:58:00 pm1V per cell is not a very low voltage though.

author: tom66
author_rank: Super Contributor
timestamp: August 19, 2024, 02:02:11 pm
content: Quote from: wraper on August 19, 2024, 02:00:38 pmAgreed, if it's uniformly distributed across the pack.But if it's 6 cells at 1.2V and 1 cell at 0.7V then it can be an issue.

author: MrMobodies
author_rank: Super Contributor
timestamp: August 19, 2024, 02:05:07 pm
content: Quote from: tom66 on August 19, 2024, 02:02:11 pmYes that's what I am worried about.I'll let the seller know and charge discharge them see how they perform.

author: wraper
author_rank: Unknown
timestamp: August 19, 2024, 02:09:13 pm
content: Quote from: tom66 on August 19, 2024, 02:02:11 pmThat would be unlikely and would require a huge charge level imbalance. These cells likely just self discharged to about 1V.

author: tom66
author_rank: Super Contributor
timestamp: August 19, 2024, 02:45:16 pm
content: Quote from: wraper on August 19, 2024, 02:09:13 pmWell, the trouble is we have no idea how the pack was stored beforehand, and whether it has been underdischarged. Hence my disclaimer. Yes, it may well be normal self discharge but it could also be an abused/returned pack that has been sold on.

author: wraper
author_rank: Unknown
timestamp: August 19, 2024, 03:53:29 pm
content: It those are not LSD cells, they'll self discharge to from full to empty within a few months.
Recommendation for testing high voltage transient protection - Page 1
Forum section: electronics / general

author: hrshovon
author_rank: Newbie
timestamp: August 19, 2024, 01:55:41 am
content: Hello,I was not sure where to post this so ended up posting it here.I am working on a IoT device which collects data via RS485 and sends it to cloud. I have tried my best to add safety features like reverse voltage protection at input and TVS diodes etc. at the output. But I want to test the protection to see if its working as intended. Can anyone suggest me test equipments/circuits to test such protections? One of the main uses of this device is to collect data from household/industrial single/three phase energy meters.TIA
New DMM front panel artwork - DT830 - Page 1
Forum section: electronics / general

author: Brumby
author_rank: Unknown
timestamp: August 21, 2024, 02:41:36 am
content: I had some fun with my <$10 DT830 a few years ago which resulted in having to replace the front panel decal. Once created, I had some mods in mind ........The new front panel artwork:The story of how it began and the iterative process of development is documented here:https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg1689437/#msg1689437Feel free to use or adapt it for your own purposes.
Custom search engines - Page 1
Forum section: electronics / general

author: fzabkar
author_rank: Super Contributor
timestamp: August 11, 2024, 09:18:48 pm
content: I use custom search engines to expedite specific searches.For example, to find the Micron part which correspond's to an FBGA code of D9SGQ, I would use either of the following custom searches, where the relevant placeholder is replaced with "D9SGQ".https://www.micron.com/support/tools-and-utilities/fbga?fbga={searchTerms}https://www.micron.com/support/tools-and-utilities/fbga?fbga=%sHowever, this no longer works. It's not a big deal, but would anyone know how to automate the search on the following landing page?https://www.micron.com/sales-support/design-tools/fbga-parts-decoder

author: tom66
author_rank: Super Contributor
timestamp: August 11, 2024, 10:02:19 pm
content: You'd have to read JSON, but it looks like a request FBGA code D9SGQ results in this JSON request:https://www.micron.com/content/micron/us/en/sales-support/design-tools/fbga-parts-decoder/_jcr_content.products.json/getpartbyfbgacode/-/-/-/en_US/-/-/D9SGQAnd part number MT41K512 results in this:https://www.micron.com/content/micron/us/en/sales-support/design-tools/fbga-parts-decoder/_jcr_content.products.json/getpartbyfbgacode/-/-/-/en_US/-/MT41K512/-You can put the JSON into a prettifier tool (Chrome has a built in one), or write a Python script or similar to format it nicely.Sadly this is all you can really do as under the hood this is just a JavaScript application fetching this API endpoint. There may be some way to automate this within a browser, but I couldn't say how.

author: fzabkar
author_rank: Super Contributor
timestamp: August 11, 2024, 10:31:08 pm
content: Quote from: tom66 on August 11, 2024, 10:02:19 pmAlready done! Thanks very much!I can now initiate a search from the URL bar or via the r-click context menu.This is how you do it in Edge:edge://settings/searchEnginesI guess it would be the same in Chrome.I can also do it in Firefox.For searches from the context menu I use SPC.https://github.com/YoshifumiFuyuno/Search-from-Popup-or-ContextMenu/wiki/Instructions

author: fzabkar
author_rank: Super Contributor
timestamp: August 17, 2024, 11:25:40 pm
content: @tom66, I see how you did this (via Inspect in the context menu), but I can't work out how to do the same for NTE's search engine. Would you be able to show me how to automate the Part Number Search here?https://www.nteinc.com/search.php
HP1670E Logic Analyzer - Page 1
Forum section: electronics / general

author: krucker
author_rank: Newbie
timestamp: August 16, 2024, 08:03:12 am
content: HelloI've bought recently a HP1670E logic analyzer and tried a firmware update from (V2.3?) to V3.02 from disktettes found on ebay. The update was succseful done but the analyzer remains in the system configuration menu. A switch zo analyze mode is not possible. Now I'm looking for a backgrade to an older Version of the firmware (e.g. V2.3) but I didn't found anything. May someone help Me to fix My problem?Kind regardsGerhard Krucker from Switzerland
Datasheet question - Page 1
Forum section: electronics / general

author: SlimEddie
author_rank: Newbie
timestamp: August 13, 2024, 02:50:13 pm
content: Hi guys,I think either I am missing something or there is a mistake in a datasheet. I am looking for some one to give your thoughts on the meter.I was in the process of replacing TI's GaN fets on a halfbridge and replacing isolated supply with a bootstrap. I ended up picking NV6128 GaN fets to replace LMG341xR070, as they have some excess features that we don't need and the price can be reduced.The issue I have run into, I am driving the half-bridge from F28049C TI's MCU, and the PWM level is 0..3.3V, while the GaN fet driver accepts 0..5V (with 1V and 4V thresholds).So by following the datasheet for NV6128https://eu.mouser.com/datasheet/2/1451/NV6128_Datasheet-3076917.pdf, on page 15 Fig. 26 the manufacturer suggests the use of SN74LVC1G34 buffer. What got me confused is how can this buffer with a supply voltage of 5.5V max be used in the configuration that is shown in the attached image? and in terms of using it on high side, wouldn't connecting it to SK fry it because SK is connected to the Source which can be at quite a high voltage?

author: selcuk
author_rank: Frequent Contributor
timestamp: August 13, 2024, 08:56:12 pm
content: It is on Figure 22 in the datasheet and SK is not connected to PGND, Source or CP. For example in Figure 23 they are all connected and it doesn't have the buffer. You may read "8.4. Source Kelvin (SK) Ground Pins" part for further information. The reference ground for the PWM section becomes SK and not PGND for that application.

author: SlimEddie
author_rank: Newbie
timestamp: August 14, 2024, 01:28:55 pm
content: Yes I do understand what you mean, as it is not connected externally, but as far as I understand there is still a direct connection to the source of the fet, albeit that the main source current doesn't flow out of the kelvin connection, wouldn't this pin be at the potential of a switching node (point between high side fet source and low side fet drain). Wouldn't this potentially create a high potential difference between the supply pin and ground pin of a buffer?

author: selcuk
author_rank: Frequent Contributor
timestamp: August 14, 2024, 02:16:03 pm
content: On the "simplified schematic" in the datasheet, it looks like there is an internal connection from SK to S. That is definitely a short. But check Figure 1 in the below document. S pins are shorted together but SK is not. I believe there is a similar internal connection here. Nevertheless, it is hard to decide that when SK and S are shorted on internal drawings in the datasheet.https://www.onsemi.com/pub/Collateral/AND9932-D.PDF

author: dietert1
author_rank: Super Contributor
timestamp: August 14, 2024, 03:16:13 pm
content: S = SourceSK = Source kelvin connection, load current freeCertainly SN74LVC1G34 can't work in that circuit as its max supply is 5.5 V. Even VDZ = 6.2 V is a bit high. Its supply must be somewhere else.Regards, Dieter
EEVblog forum account deleted - Page 1
Forum section: electronics / general

author: pg
author_rank: Newbie
timestamp: August 17, 2024, 09:30:29 am
content: I just tried to login to the forum with the account created in 2011. -> Account does not exist.I could create the account again with the same user name.Are the accounts deleted after some time without login or some other criteria?

author: Brumby
author_rank: Unknown
timestamp: August 17, 2024, 09:40:23 am
content: Zero post accounts are periodically cleaned out. I think inactive accounts are included.
LearnElectronics channel gone dark - Page 1
Forum section: electronics / general

author: msknight
author_rank: Regular Contributor
timestamp: August 10, 2024, 01:42:29 pm
content: Does anyone know what happened to LearnElectronics please?His channel has gone dark and he's marked as no longer active on Patreon.There seems to be no activity on the Discord channel either.
NFC/IEC14443 compatible Analog Front End (13.56 MHz) - Page 1
Forum section: electronics / general

author: luudee
author_rank: Frequent Contributor
timestamp: August 07, 2024, 06:46:07 am
content: Dear Friends,I am looking for an analog front end for NFC/IEC14443 that operates at 13.56 MHz.I've been looking around at various analog chip manufacturers but don't seeanything obvious. I want to receive and transmit raw data over that interface.Any recommendations/suggestions?Many Thanks,rudi
Compositing with the sodium vapour process .... Better than green screen! - Page 1
Forum section: electronics / general

author: Brumby
author_rank: Unknown
timestamp: August 08, 2024, 09:11:41 am
content: In Dave's live stream (just finished) mention was made of a process used in the production of the film Mary Poppins that provided a method of compositing far superior to the well known green screen method.I remember recently watching a video on precisely this process - and managed to find it:

author: ebastler
author_rank: Super Contributor
timestamp: August 08, 2024, 05:21:02 pm
content: Thank you, that is a cool video. I did not know that this approach was used for keying movie images.But I object the implied claim that making dichroic mirrors (i.e. wavelength-selective beam splitters) is a lost art. They are commonly used e.g. in fluorescence microscopy, and made to very tight spectral specifications, using multi-layer coatings.
Body parts? - Page 1
Forum section: electronics / general

author: Terry Bites
author_rank: Super Contributor
timestamp: August 04, 2024, 03:11:06 pm
content: https://www.aliexpress.com/item/32913593967.html?spm=a2g0o.productlist.main.3.5aa33b11R5aDZJ&algo_pvid=dc5e88e1-eb5c-4b5e-be6f-97ee528aac96&algo_exp_id=dc5e88e1-eb5c-4b5e-be6f-97ee528aac96-1&pdp_npi=4%40dis%21GBP%217.49%217.49%21%21%219.26%219.26%21%40211b653717227841647954735e0338%2166024604040%21sea%21UK%213100120370%21X&curPageLogUid=b9Wq6unr33GJ&utparam-url=scene%3Asearch%7Cquery_from%3A

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 04, 2024, 03:19:55 pm
content: The Aliexpress translation feature is terrible. Many times I have no idea what they are talking about.The most irritating thing is that adult toys appear in search suggestions and recommended products.It is puzzling that it appears even though I have never searched for it.I don't need them now, so please go away.

author: Kim Christensen
author_rank: Super Contributor
timestamp: August 04, 2024, 03:29:23 pm
content: I guess I'd feel a bit feverish and would spew some bile if I paid that much for a single capacitor (inductor) on Aliexpress when it's cheaper on Digikey.

author: fzabkar
author_rank: Super Contributor
timestamp: August 07, 2024, 02:45:55 am
content: You can truncate Ali's tracking garbage (everything after, and including, the "?").https://www.aliexpress.com/item/32913593967.html
NXP account woes - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 05, 2024, 11:49:09 pm
content: Hi, got an email from NXP that says I haven't logged in to my account in 6 months (which, btw, I have). Then when logging in, it shows a "Verify your email" step. It says it's sent a verification code. That you never receive. I've tried "resend code", to no avail. Still no email with a code.Not the first time it happens, as I remember. Has the same happened to you as well? What's up with that?

author: ejeffrey
author_rank: Super Contributor
timestamp: August 06, 2024, 12:05:48 am
content: Last time I had to verify my email the verification email took 30 minutes to show up.

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 06, 2024, 12:28:53 am
content: Quote from: ejeffrey on August 06, 2024, 12:05:48 amThat's good to know, problem is that the verification code expires after 10 minutes. So, that's a problem.

author: boB
author_rank: Frequent Contributor
timestamp: August 06, 2024, 12:33:53 am
content: I'm sure you checked you spam folder ?I have this problem sometimes too. Not necessarily with NXP but..

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 06, 2024, 12:39:53 am
content: Yep. No spam. Also tried clearing cookies, just in case. Also tried in Chromium (I use Firefox usually), just in case this would be more of a website issue. Nope, nothing.The email that's linked to this account is a gmail address. Maybe they filter that somehow.

author: boB
author_rank: Frequent Contributor
timestamp: August 06, 2024, 01:22:26 am
content: I have no idea why some web sites cannot make this work right but I have had the same problem many times.Sometimes I will try a different browser.The only problem I have with gmail not delivering anyway (not sure about receiving) is files with file name extensions like .exe .hex .asc etc.Very strange internet world that I will never know many of its secrets. Like electronics, it breaks.

author: ejeffrey
author_rank: Super Contributor
timestamp: August 06, 2024, 02:25:33 am
content: Quote from: SiliconWizard on August 06, 2024, 12:28:53 amYeah it's bad. The second one came fast enough to use. But if you aren't getting an email at all I would wait 24 hours to try again.

author: shabaz
author_rank: Frequent Contributor
timestamp: August 06, 2024, 02:39:22 am
content: It's crazy. I needed a file so I logged on, and I waited and the first e-mail didn't arrive. I attempted a second time after a few minutes, and that didn't arrive either.. until several hours later!

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 06, 2024, 02:57:09 am
content: Yes, finally received a code 4 hours later. Of course, it didn't work. Yes, maybe at some point their server will send a code fast enough. Looks like a well polished turd.
Solar freaking power hats - Page 1
Forum section: electronics / general

author: Bud
author_rank: Super Contributor
timestamp: August 04, 2024, 01:52:45 pm
content: Claimed 12 Watt solar power hat.https://www.theverge.com/2024/8/3/24212686/ecoflow-power-hat-solar-powered-hat-usb-c-charger-smartphone

author: Nominal Animal
author_rank: Super Contributor
timestamp: August 04, 2024, 02:11:22 pm
content: Let's do a back-of-the-envelope check: Let's estimate solar irradiance at best about 1 kW per square meter. Small high-efficiency panels convert about 20% of that to electricity, or about 200 W/m². 12 W / 200 W × 1 m² = 0.06 m² = 600 cm² ≃ 93 in², i.e. you need a panel with a surface area of 600 cm² or 93 sq-in to produce 12 W. That is a circular panel with a diameter of about 28 cm or 11" directed towards the sun. As an annular ring with a 20cm/8" hole in the center, it'd have a diameter of at least 50cm. The article states diameters between 56 and 61 cm (22" to 24"), so it seems plausible.However, that size brim reminds me of a sombrero or an umbrella.Gimmick caps with tiny fans and palm-sized panels have existed for at least three decades, though.

author: Halcyon
author_rank: Unknown
timestamp: August 05, 2024, 12:29:24 pm
content: Just use an Android instead of an iPhone. Eliminates charge anxiety almost completely.I will say however, the current Apple laptops are absolutely phenomenal on battery. I no longer bother carrying around a charger/cable. I'd easily get 2 days use out of my Macbook.
I2C data detector gadget? - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: August 03, 2024, 05:32:08 pm
content: Is there anything equivalent to the old neon in a screwdriver device that was used to show the presence of mains voltage.I just want to visually show the presence of data on a I2C bus, the problem being that the pulse trains can be very brief so it needs a persistance of vision effect.

author: Andy Chee
author_rank: Super Contributor
timestamp: August 03, 2024, 05:50:25 pm
content: Logic probe.Usually they can detect HI, LO, or pulse train.https://en.wikipedia.org/wiki/Logic_probeOf course, if you want to distinguish an RS232 pulse train, from a SPI pulse train, from a I2C pulse train, then you need a protocol analyser. And I don't know if they exist in "probe" form factor.

author: Nominal Animal
author_rank: Super Contributor
timestamp: August 03, 2024, 06:29:08 pm
content: If I didn't have a logic probe, then I'd use a small microcontroller, perhaps an ATtiny. (For quick checks, I use one of my microcontroller dev boards.)If you want the indicator to have minimal effect on the I²C bus, then you need some kind of a buffer. I might try a 74LVC2G17, which is dual Schmitt trigger with 5V tolerant inputs; the input currents are about a microamp, so insignificant considering the typical recommended I²C pull-ups of 1k-10k.All in all, I'd expect the components for this, including the microcontroller, to cost about USD $1, definitely under $2, at Mouser in singles.
Watch out, there's AI about - Page 1
Forum section: electronics / general

author: PlainName
author_rank: Super Contributor
timestamp: July 31, 2024, 08:01:05 pm
content: Q: Does a non-contact DC voltage sensor exist?A:Quote from:https://www.quora.com/Does-a-non-contact-DC-voltage-sensor-existAnswer includes a nice photo of a suggested tool: a Meco 27 Auto. Operating manual attached in case you weren't convinced.

author: magic
author_rank: Super Contributor
timestamp: July 31, 2024, 08:42:51 pm
content: LOLBut you could actually detect DC electric field with respect to earth, if you have earth connection available.

author: DmitryL
author_rank: Regular Contributor
timestamp: July 31, 2024, 09:23:01 pm
content: Q: Does a non-contact DC voltage sensor exist?I'm not an AI, but it seems that it does, at least, I have oneIt has a nicely looking mechanical chopper with rotating fins.
Need help identifying headers. Small PSU and server PSU. (Cross post.) - Page 1
Forum section: electronics / general

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: July 29, 2024, 12:48:00 pm
content: (I'm cross posting because I couldn't get an answer where I asked before.)Hello,I've search the web, browsed digikey a bit, but I've not been able to identify the below pictured connectors.There's a server PSU connector example listing here .The other is a small 75W transformer. It has 4 connectors which I couldn't find. The 5th is a JST connector with one small black wire poking out of it.I took some measurements of it. The pins are 1.25mm wide. The 6p connector is ~24mm long and ~6mm wide. The other three are also ~6mm wide with the 4p being ~17mm long and the 3p being ~12mm long. The reverse latching 3pin connector is ~12mm long by ~7mm wide.Anyone know how to find connectors like these/what they are?Thanks!

author: ajb
author_rank: Super Contributor
timestamp: July 29, 2024, 04:42:50 pm
content: Quote from: ballsystemlord on July 29, 2024, 12:48:00 pmFYI, JST is a manufacturer that makes hundreds of different connectors, so calling a specific part a "JST connector" isn't very precise.In the pictures labeled `connectors1` and `connectors2`: The small white 2-pin connector is a JST XH, and the larger white connectors are JST VH (or compatible equivalents). The translucent connector is a little harder, as there are several manufacturers that make very similar connectors and not all of them are fully compatible (mostly differences in the locking ramp/latch/polarization geometry), but I would look at the TE MTA and Molex HSG series. Note that both have several different subseries under those labels, and similar parts under different labels, so you'll need to look around a bit and compare the drawings to what you have.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: July 30, 2024, 04:14:10 am
content: I actually just referred to it as a JST connector because that's what people selling them call them. Now I know. The clear connector is likely also a very popular part from a big manufacturer.
Metal enclosure finishes on consumer electronics - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 29, 2024, 03:48:33 pm
content: First time I see or notice that a plastic wrap of some kind is being used to wrap up a metal enclosure.It was because of the dingy yellow color that I saw this. But it doesn't clean off.It's supposed to be clear I guess since pictures of other units show it metallic.(Archer 15-1263)I guess it also gives a texture. Was/is this common? I thought paint was the way to go.

author: jfiresto
author_rank: Frequent Contributor
timestamp: July 29, 2024, 04:27:37 pm
content: Could it be a protective film and there to avoid scratching the outer surface, when you cut, punch and drill the panel, after which you peel it off to reveal unblemished metal?

author: ajb
author_rank: Super Contributor
timestamp: July 29, 2024, 04:47:46 pm
content: Is it actually a plastic film, or could it be a coating? The fact that the coating is so tight to the edges of the panel doesn't look like a film to me, but more like it was coated. The area around the hole looks like it could have been masked off during paint/powder coat. The dingy yellow color could just be that clear coat yellowing with time/sun/chemical exposure.
Real cool video on MH370 - Page 1
Forum section: electronics / general

author: JustMeHere
author_rank: Frequent Contributor
timestamp: August 06, 2024, 04:53:18 am
content: This video shows a lot of details on the route taken and why the pilot might have flown that route.At the end is a very cool technical section on how airplanes can be tracked by the way they interfere with radios. Worth watching for that part alone.This video is pushing 5M views.

author: Andy Chee
author_rank: Super Contributor
timestamp: August 06, 2024, 10:53:04 am
content: Even though the end of the video cites Joe Taylor in the creation of WSPR, Joe Taylor himself has rejected the idea that WSPR is capable of being used to detect aircraft movements.https://mh370.radiantphysics.com/2021/12/19/wspr-cant-find-mh370/Essentially the technique needs to be "proven" by tracking an historical aircraft that hasn't crashed (e.g. my flight from Australia to USA in August 2022), and so far, the methodology proposed by these MH370 conspiracy theorists has not been forthcoming.As usual, clickbait view counts don't mean jack.Incidentally, the topic of WSPR & MH370 is not new, and pops up every now and again for attention grabbing purposes:https://www.eevblog.com/forum/rf-microwave/amateur-radio-operators-claim-to-know-where-flight-370-crashed-in-indian-ocean/msg4060453/#msg4060453https://www.eevblog.com/forum/rf-microwave/wspr-used-to-serach-for-mh370/msg3556211/#msg3556211https://www.eevblog.com/forum/chat/wreckage-of-mh370-washing-up-on-reunion-island/msg4025956/#msg4025956It's the epitome of lax critical thinking, the hallmark of any conspiracy theory.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 07, 2024, 05:05:16 am
content: Deep Sea Vision claims to have found Amelia Earhart's plane, which is much smaller than a 777. They want to find MH370 next.https://www.popularmechanics.com/flight/a46576633/amelia-earhart-plane-found/https://www.popularmechanics.com/flight/a60231494/amelia-earharts-plane-found-search-for-mh370-begins/
Post a picture of a watch! - Page 1
Forum section: electronics / general

author: Picuino
author_rank: Super Contributor
timestamp: July 22, 2024, 11:26:46 am
content: This is one of my automatic watches. A Seiko super 5, with exposed mechanism on the back.I also have several digitals, of which the trusty old Casio F-91W is my favorite.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 22, 2024, 11:36:09 am
content: Is there anything special about this microcontrollerless glue logic clock?Yes! It has an absolutely non-multiplexed display. All segments are driven by their own gate with an own resistor. It´s absolutely flickerless.Please don't ask why I care about such a thing

author: Picuino
author_rank: Super Contributor
timestamp: July 22, 2024, 01:59:43 pm
content: https://www.instructables.com/Make-Your-Own-Retro-Nixie-Clock-With-an-RTC/

author: Halcyon
author_rank: Unknown
timestamp: July 22, 2024, 02:04:20 pm
content: Quote from: Phil1977 on July 22, 2024, 11:36:09 amIt's more interesting than a photo of a cat?

author: themadhippy
author_rank: Super Contributor
timestamp: July 22, 2024, 03:42:48 pm
content: Quotesounds a bit like my kitchen clockthe living room version is a bit more traditional without a segmented display

author: pcprogrammer
author_rank: Super Contributor
timestamp: July 22, 2024, 05:12:08 pm
content: Quote from: themadhippy on July 22, 2024, 03:42:48 pmYou must be an absolute expert on binary if you can easily get the time from that one.

author: shakalnokturn
author_rank: Super Contributor
timestamp: July 23, 2024, 12:05:01 am
content: I don't own any although I find Storm to be very original in their designs.

author: Picuino
author_rank: Super Contributor
timestamp: July 30, 2024, 02:37:23 pm
content: https://www.elektormagazine.com/labs/quasi-analog-clockwork-an-elektor-classic-a-remake
Special solder for removing ICs - Page 1
Forum section: electronics / general

author: Peter Tryndoch
author_rank: Contributor
timestamp: July 28, 2024, 02:51:26 am
content: What is the name, or more specifically - what will get a hit on Ebayfor a special type of solder for removing components such as ICs.It has a long plastic phase, so you flood the component with it and remove before the solder hardens.

author: edpalmer42
author_rank: Super Contributor
timestamp: July 28, 2024, 03:09:41 am
content: Are you thinking of ChipQuik? It has a low melting temperature which means it stays liquid longer.

author: Helix70
author_rank: Unknown
timestamp: July 28, 2024, 03:29:05 am
content: Low temperature solder commonly has a high Bismuth content, like Chip Quik.

author: Peter Tryndoch
author_rank: Contributor
timestamp: July 28, 2024, 04:43:36 am
content: Yesss Chip Quick, that's the name of it.But man it ain't cheap.Seems to be US made, and the listings don't mention shipping to Australia,which more than likely will cost more that the product itself.Think I'll give it a miss for now.

author: ebastler
author_rank: Super Contributor
timestamp: July 28, 2024, 04:50:44 am
content: Quote from: Peter Tryndoch on July 28, 2024, 04:43:36 amYou can look for generic no-name versions of that type of solder. It's Sn42/Bi58, melting point 138°C (280 F) is the commonly stated spec. Take a look at Ebay, Aliexpress etc., and you should find cheap options with affordable shipping.

author: Peter Tryndoch
author_rank: Contributor
timestamp: July 28, 2024, 06:11:22 am
content: The trick is to know what to search with: Sn42/Bi58I found some cheaper clone stuff.They all seem to be in paste form.Anyway I ordered some and will see how good it is.Thanks for the tip.

author: Psi
author_rank: Super Contributor
timestamp: July 28, 2024, 06:48:04 am
content: Quote from: Peter Tryndoch on July 28, 2024, 04:43:36 amChip Quick also make normal solder. Don't make the mistake of thinking Chip Quick = low temp solder.If it's low temp solder it will say low temp, or it will say a temp of around 140°C.Normal solder is above 180C.

author: oPossum
author_rank: Super Contributor
timestamp: July 28, 2024, 07:10:30 am
content: Quote from: Peter Tryndoch on July 28, 2024, 02:51:26 amhttps://en.wikipedia.org/wiki/Rose%27s_metalhttps://en.wikipedia.org/wiki/Wood%27s_metal

author: lowimpedance
author_rank: Super Contributor
timestamp: July 28, 2024, 10:40:28 am
content: Quote from: Peter Tryndoch on July 28, 2024, 04:43:36 amMektronics in Sydney stock the small chipquick SMD removal kit, $36.08.Expensive depends on the value of the device being repaired I guess.

author: Shock
author_rank: Super Contributor
timestamp: July 28, 2024, 10:57:43 am
content: It's about $20 on Digikey, I'd shop around.

author: edpalmer42
author_rank: Super Contributor
timestamp: July 28, 2024, 04:46:35 pm
content: Quote from: Peter Tryndoch on July 28, 2024, 04:43:36 amIt's worth noting that if you search for "Chip Quick" you will limit your results. The actual name is spelled "ChipQuik".Ed
Linux GPIB driver for NI GPIB-ENET/100 - Page 1
Forum section: electronics / general

author: Tony_G
author_rank: Super Contributor
timestamp: June 29, 2022, 10:11:16 pm
content: Hey All,I have a NI ENET-GPIB/100 (basically a GPIB LAN gateway that I think is VXI based but don't quote me) - This device was dropped from support in the NI 488.2 v18+ driver package so I've kept my own copy of the v17.6 Windows driver around.Now I would like to install it on a Linux VM but I can't seem to find this anywhere and, as I mentioned above, NI itself has stop providing it.As a Linux noob, does anyone know if there is a Linux driver that supports this? From looking at the various READMEs, the public driver packages all seem to only support expansion cards (PCI/PCIe/etc) or USB-based adapters.If anyone can point me in the right direction I'd appreciate it.Thanks,TonyG

author: r6502
author_rank: Regular Contributor
timestamp: July 24, 2024, 04:26:24 am
content: Hello all,#I reply to this older post, as I have this GPIB Ethernet adapter as well. I used it on an old mac book air together eit te community edition of labview and it worked fine.I'm struggeling with Labview asi ist is a kind of closed development solution, and you must renew the licence on a regular base so i decided to go withgo with Python, but i did not find any useful information how to direct access the GPIB-ENET/100 without the NI visa drivers. This would be very interesting, as I just switched to a new laptop with m3 arm inside.I found an older post:GPIB-ENET still usable?, that handles the older GPIB-ENET adapter, but the linked sources tell that it is not working with the newer devices like GPIB-ENET/100.Is there anywhere a description how to access the GPIB-ENET/100 directly without NI drivers or is the oly way to insall th NI drivers and use the VISA interface? Has anybody done some reverse engeneering or looked at the communication between PC an the GPIB-ENET/100 adaper?BR Guido