hybridfree/eevblog-posts huggingface dataset:
Low Cost Eye Diagram Generation - Page 1
Forum section: electronics / general

author: Weston
author_rank: Regular Contributor
timestamp: May 01, 2023, 10:01:29 pm
content: I was recently watching a youtube video ( youtube.com/watch?v=u6lx1ntNoxE ) about a cable tester for HDMI / USB cables and I noticed in the teardown portion of the video that the front end looked really simple for something that can take eye diagrams up to 12.5 Gbps . The product documentation shows pretty decent eye diagram photos too:https://www.totalphase.com/products/advanced-cable-tester-v2/I was pretty curious about how this works, especially given the manufacture bothered to sand the part number off the IC.I thought about how it might work for a while and started digging through datasheets, and I am pretty sure I have found how it works: They are using the built in eye capture feature for a high speed serial re-timer IC. The IC also generates the test patterns, so no other high speed interfaces are required!Based on the pinout and specifications, I am pretty sure they are using this quad channel retimer from TI:https://www.ti.com/product/DS125DF410The chip is ~$30 in qty 1 on digikey and the eye capture works to the full data rate of 12.5Gbps. The eye capture mode provides the bit error rate for 64 offset values of time and for 64 bit offset values of voltage, which is a good, but not great eye diagram.I thought this was pretty cool and worth sharing that you can capture eye diagrams that would otherwise require an absurdly expensive sampling scope with a rather low cost IC. In this application they are just testing a cable and controlling the TX and RX signals, but it seems you could use this IC to generate eye diagrams from arbitrary data sources. I wonder if you could even add a pre-amp to use it to probe data busses.The biggest limitation is that the chip needs to be able to lock to the signal and recover the clock to generate the eye diagram and there is no provision for an external reference clock for the TX signal. I do wonder if there are other similar chips that have that feature though, the hardware for a low cost TDR or sampling scope is basically all there!
It Let The Smoke Out - Page 1
Forum section: electronics / general

author: DW1961
author_rank: Frequent Contributor
timestamp: April 29, 2023, 04:38:41 am
content: I was tearing this old Antec PSU down and found why I think it hit the trash can. there was a daughter board attached to it. One of the corners of the board was literally smoked crispy, and a couple of the resistors were cracked.I think this was a daughter board voltage regulator? Any ideas how or what went wrong? I put a couple of the fried 100 Ohm resistors on top of it just so you can see them in the image.
Content Creators Shortchanged by Advertising Priority - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: April 28, 2023, 06:23:20 pm
content: Alphabet Shorts & YT content creatorspicked this up from other videos posted by video game content creatorsYT platform 2.6% advertising revenue lossas monetization now number one priority.shorts -made for phone 60 second tiktok style video clips, has less revenue for content creatorswould you like your electronics videos in tiktok style video clips?https://fortune.com/2023/04/26/youtubes-number-one-priority-is-shorts-its-tiktok-rival-as-new-ceo-neal-mohan-scrambles-to-reverse-declining-ad-revenue/

author: RJSV
author_rank: Super Contributor
timestamp: April 28, 2023, 07:32:47 pm
content: (T.I.C.)Couldn't content producers simply choose 'another' close or equal sized competitor ?(T.I.C. meaning 'tongue in cheek sarcasm)- - T.Y.S.(That's 'Told you so....meaning that the monopoly doesn't care, and doesn't need to even pretend to care, about whatever quality )
Would anyone know where to find this plug? - Page 1
Forum section: electronics / general

author: aaron94
author_rank: Newbie
timestamp: April 25, 2023, 10:04:07 pm
content: Has gone open circuit inside and I need to replace it but I’m not having much luck finding any.Thanks in advance!

author: tooki
author_rank: Super Contributor
timestamp: April 27, 2023, 10:11:51 am
content: Looks like Binder 719 series. (That’s the Binder logo on the plug.)However, right-angle plugs (and premolded cables) aren’t sold, it was probably custom made for your product.https://www.binder-connector.com/en/products/subminiature-circular-connectors/snap-in-ip40#filter:contacts=_4

author: aaron94
author_rank: Newbie
timestamp: April 28, 2023, 09:10:37 am
content: Unbelievable, I looked forever and couldn’t it. Thanks a lot. 😀
Help with ICs - Page 1
Forum section: electronics / general

author: jackbauer
author_rank: Newbie
timestamp: April 28, 2023, 03:38:07 am
content: Are the XL74LS08 and 74LS08 the same/equivalent?Also, is a IC 78L05 voltage regulator a transistor? Because when I search for that IC, I even get pictures of transistors, I need to know exactly how it is.

author: Kim Christensen
author_rank: Super Contributor
timestamp: April 28, 2023, 03:58:16 am
content: The XL is probably just the manufacturer code.The 78L05 can come in the TO-92 package just like transistors do. So yes, it'll look like a transistor, but it's really a 5V regulator if it's labeled as a 78L05.
What is the type of this connector, LED undercabinet light - Page 1
Forum section: electronics / general

author: tggzzz
author_rank: Super Contributor
timestamp: April 26, 2023, 10:43:35 am
content: I want to link two undercabinet LED lights I bought a while ago from, IIRC, Lidl. Unfortunately I can't locate either a second mains lead or a short cable that can be used to daisy chain two luminaires. Key points: 240V, no earth, polarised for unknown reason, pole pitch ~8.5mm, other dimensions in pictures.So, what's the type of this connector? My google-foo has failed me

author: Gyro
author_rank: Super Contributor
timestamp: April 26, 2023, 12:10:11 pm
content: I don't know if this one from Screwfix would fit...https://www.screwfix.com/p/sylvania-connecting-cable-0-3m-3-pack/546kj(Also a fan of Lidl undercabinet lighting)

author: tggzzz
author_rank: Super Contributor
timestamp: April 26, 2023, 01:38:34 pm
content: Quote from: Gyro on April 26, 2023, 12:10:11 pmDifficult to see, both in the photos and in the store. The indentations in the plug look symmetric, which would only work if the light's polarising key was removed.If worst comes to worst, I'll remove the polarising key and see if an LS-7 connector can be inserted.

author: themadhippy
author_rank: Super Contributor
timestamp: April 26, 2023, 01:55:29 pm
content: Do these dimmesion line up with yours?

author: tggzzz
author_rank: Super Contributor
timestamp: April 26, 2023, 02:00:13 pm
content: Quote from: themadhippy on April 26, 2023, 01:55:29 pmNope; 8.5mm pitch, asymmetric plug.
sensor parking hilux beeping - Page 1
Forum section: electronics / general

author: rubenmello
author_rank: Newbie
timestamp: April 25, 2023, 09:36:20 am
content: HELLOWHEN I TURN ON THE reserse SENSOR IT STARTS BEEPING CONSTANTLY FOR A FEW SECONDSE CLEAN all 4 sensor e disconect all and continuewhen i disconect the module control /10 r 03 0426) stop the beepthe pass light dont turn on
More musings about AI:.   Self-aware VS. obvious Corruption.  ? - Page 1
Forum section: electronics / general

author: RJSV
author_rank: Super Contributor
timestamp: April 25, 2023, 06:54:41 pm
content: Hello! Of course, (here) I'm known negative thinking, (like, what if a NUKE does, accidently get sent), I've always considered from standpoint of a useful CRITIC, pointing out that something, somewhere, isn't what the package label says...exactly. old school they called it 'The Q.C. guy...What about, say, suppose the various public mentions of search engine / AI are true, to whatever extent ? You've searched on 'John Smith for Governor' and nothing from the word complete, until almost done typing.Yet, in the same experiment, simply typing a 't' into the search box will get you all sorts of auto-complete, like:'Thomson Indighted on 1400 counts'.Something awfully fishy, from a respectfully non-partisan writing style (hopefully!).But, there is a 'catch' coming, as AI becomes more subtle and understanding various nuances, any actual search engine 'hanky-panky' would become, obviously, apparently obvious to any, full-minded AI.As a close, I would suggest, also, that any AI 'experienced' in Consumer Dynamics, for sales for example, would be able to recognize various crimes and financial schemes...by nature!Thanks for speculating, with my proposal !

author: RoGeorge
author_rank: Super Contributor
timestamp: April 25, 2023, 07:05:42 pm
content: Please post AI topics in the dedicated section:https://www.eevblog.com/forum/chatgptai/
Agricultural right to repair being signed into law without poison pill amendment - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: April 25, 2023, 12:30:27 pm
content: Wow.

author: Psi
author_rank: Super Contributor
timestamp: April 25, 2023, 12:50:52 pm
content: It's just the start really.It's only going to be valid for the state in question.And once it takes affect I imagine it will take lawsuits to force John Deere to actually comply. Plus any appeals etc..But yeah, good milestone achieved. (well i guess not until the signing event happens but yeah)

author: nctnico
author_rank: Super Contributor
timestamp: April 25, 2023, 01:18:02 pm
content: This is great news but it is just a start. I have some worries about keeping products safe and adhering to agency approvals. And I do wonder though whether you want to allow uncertified technicians to work on dangerous machinery like farming equipment. A hydraulic leak can lead to super nasty injuries which are not immediately obvious to doctors.In sane countries cars are subject to mandatory technical inspections which I think are a good thing for safety reasons. In the NL there is a law nowadays that says only certified technicians may work on gas heating systems. There have been too many accidents with carbon monoxide due to poorly installed heating systems.IOW: right to repair requires the government to step in and make sure public safety isn't affected.

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2023, 04:14:44 pm
content: Quote from: nctnico on April 25, 2023, 01:18:02 pmHow many combines versus how many automobiles? At least in California, the only mandatory automotive inspection is for smog and it is done every 2 years and never for EVs. Other states have different rules but California is a pretty populous state. The inspection is required to renew the registration so you won't get a license plate year tag without the inspection.There is also nothing preventing DIY auto repair. You just need to pass the smog test every 2 years. No particular qualifications required. The smog inspection process is HIGHLY regulated.There are thousands of stores selling remanufactured parts and some brands of factory parts. New factory parts can be purchased through dealers.

author: nctnico
author_rank: Super Contributor
timestamp: April 25, 2023, 04:46:29 pm
content: That is why I wrote 'sane countries'Over here you can repair whatever you want on your car but it will need to pass the annual technical & environmental inspection.And it isn't about how many this versus how many that; it is about equipment and workplace safety. In the end a farm is a workplace and a good owner keeps his company a safe place to work in.
IPC edge - courses - Page 1
Forum section: electronics / general

author: mrburnzie
author_rank: Regular Contributor
timestamp: April 24, 2023, 08:12:53 am
content: Hi!I'm wondering if anyone had the opportunity to take part in one of IPC edge courses.I'm interested in attendinghttps://education.ipc.org/product/advanced-design-concepts?referrer=/ipc-pcb-design-curriculumorhttps://education.ipc.org/product/pcb-design-military-aerospace-applications?referrer=/ipc-pcb-design-curriculumHow widely is this accepted, how do companies look at a specific certification like the advanced design or the military one?All the best.Edit: also there is the CID/CID+ certificate.https://www.ipc.org/ipc-designer-certification-program

author: Benta
author_rank: Super Contributor
timestamp: April 24, 2023, 11:36:10 pm
content: Quote from: mrburnzie on April 24, 2023, 08:12:53 amCompanies don't look at it. They look at B.Sc or M.Sc and experience/projects. If you need such courses, they'll pay for them once you're hired.
working things that can be found in metal recycling dump. youtube video - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: April 23, 2023, 08:19:50 am
content: I guess these things are not particularly in high value but when you need something on budget

author: thm_w
author_rank: Super Contributor
timestamp: April 25, 2023, 10:26:53 pm
content: I wish we had access to recycled electronics here, but you are not allowed to touch the stuff that people take to the city depot. There are some local scrap yards that let you buy, but its almost all metal and wires.Shame as you can see lots of useful stuff."apocalyptic inventor" is another guy that regularly visits the scrap yard:https://www.youtube.com/channel/UCDbWmfrwmzn1ZsGgrYRUxoA
Video: "I turn HDD computer into a 220 electric battery high performance" - Page 1
Forum section: electronics / general

author: JoeRoy
author_rank: Regular Contributor
timestamp: April 21, 2023, 11:36:53 pm
content: Is a battery hidden in the motor case?

author: mariush
author_rank: Super Contributor
timestamp: April 22, 2023, 12:14:41 am
content: No, just the insides of that motor pulled out and some smaller battery powered 12v-24v motor spins the axle with the help of some rubber band or something to connect to the axle.You can see at 8:50 how easy the wheel spins ... an actual motor of that size would not have the axle spin so easily.There's enough space inside the motor to include a lithium battery pack and inside that gray plastic box where the cable goes in he could have installed some remote control sensor. Someone behind the camera can just use a remote control to start the motor when he inserts the discs in water, and use remote again when he pulls those discs out the water.He's not placing any actual load on the axle, it spins freely and he stops it with his hand, so a small size motor inside can start spinning it up at high rpm.edit: i read is a battery hidden in the discs ... 3 am here...

author: james_s
author_rank: Super Contributor
timestamp: April 22, 2023, 01:02:09 am
content: All these videos like this are just stupid scams to generate views. Don't even click them.

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 22, 2023, 02:05:51 am
content: Quote from: james_s on April 22, 2023, 01:02:09 amFunnily enough, some publicly-funded projects are not all that much better advised.

author: RJSV
author_rank: Super Contributor
timestamp: April 22, 2023, 02:16:12 am
content: I didn't makeit to 3 minutes.Watch me unscrew things, here is a saw. Me culture we no like 'head crash, on hard disk'...watch me take rat head off. That's a mirror finish...TRASHIT we don need...just click on it, while I saw the metal, on my lawn here.Gonna clean my toe injured, somedat.

author: Psi
author_rank: Super Contributor
timestamp: April 22, 2023, 02:37:07 am
content: Pretty sure you need two different types of metal for the anode and cathode.
GoPro Hero 9 Lens/Sensor Flex Cable Connector - Page 1
Forum section: electronics / general

author: JappyJan
author_rank: Newbie
timestamp: April 18, 2023, 03:58:51 pm
content: I want to integrate a "naked" GoPro Hero 9 into a custom Carbon Fiber Drone Frame.For this i need to mount the Sensor Module in a 90deg Offset to its intended orientation, which the original flex cable just does not really like...Therefore i need to design/manufacture an adapter that extends and angles the flex cable.Therefore i need to know the exact name of this connector but there seems to be 0 information about it and no one i asked so far did know this...Ill attach an image of the connector on the mainboard as well as on the flex cable,a link to aliexpress for a replacement flex cable and a link to a similar board/adapter manufactured by RedKyte Media.The redkite connector is listed here:https://www.redkytedrones.com/products/gopro-hero-8-9-10-pcbThe Aliexpress replacement flex cable is here:https://a.aliexpress.com/_EzLQsJhThe Picture of the connector is here:

author: tom66
author_rank: Super Contributor
timestamp: April 18, 2023, 04:54:34 pm
content: Could be a Molex SlimStack:https://molex.com/molex/products/family/slimstack_fine_pitch_smt_board_to_board_connectors

author: JappyJan
author_rank: Newbie
timestamp: April 19, 2023, 07:45:57 am
content: if anyone finds this question,i just got send a google doc with allmost all connectors of a lot of gopros.https://l.facebook.com/l.php?u=https%3A%2F%2Fdocs.google.com%2Fdocument%2Fd%2F1eAHqe4n2lEv_fXjdm1XhQFaNaFTQ-yXP8gqrWhUJLC8%2F%3Ffbclid%3DIwAR1xQvbIOefpFJWTw_OlEtUHTe3ieVgP15HyjKZ-QgZJB3RP5snncn3OZWE&h=AT2pS6UjDZG9U9lJQ5upAgszh-M2hGoKzziD_j-47453YIOc9hwQG8oRJB7qa1jR2L6qJl8DYbnJqkumytURSsWQCF-1EY2OejG-kocTw_R0TJ8zYPrilKBCDyRv1MhMYNZNeGN4NJiosxUlSW8AvpYVsA&__tn__=R]-R&c=AT2LanqjXQ-BPVPj1DJFvbP74MjnrSqvc6r3JWYKwxxa4dRjdRLsDCVRWtEkfPkFm0HyquwCXb_2izhSqfA2Oc_pH28dGal1xTJVE-Y4gEjoStBqn8yY825XrkgDwgEetxLzNULDxGF9zbSQmUBnlJF7ocQlJsztIGxrBok

author: Halcyon
author_rank: Unknown
timestamp: April 20, 2023, 12:10:56 am
content: Instead of posting a long link to some unknown source, it would be better if you downloaded the document and attached it here. Attachments can be up to 4MB.
Tesla and Privacy - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 16, 2023, 05:27:23 am
content: https://www.reuters.com/business/autos-transportation/tesla-hit-with-class-action-lawsuit-over-alleged-privacy-intrusion-2023-04-08/

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: April 16, 2023, 06:46:56 am
content: The sooner we all realize how and why Tesla was allowed to prosper in a tied-up auto manufacturing industry the better off we'll be.

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 19, 2023, 09:09:38 pm
content: It appears that this whole alleged privacy issue with Tesla cars was largely inflated by media outlets, and Tesla has replied.They do not gather any user data (including from cameras) unless the user explicitely allows it via application settings, and apparently the user agreement is rather clear.They also do not gather any data from cameras *inside* the cars, but only the outside ones, if you allow it, contrary to what has been said.Now to what extent Tesla does respect users' privacy settings, I don't know. At least there's an option to opt out. Is there one with all other brands of EVs having telemetry? I don't know.

author: langwadt
author_rank: Super Contributor
timestamp: April 19, 2023, 11:30:36 pm
content: Quote from: SiliconWizard on April 19, 2023, 09:09:38 pmso they won't take pictures of you in the car, but if you are running around naked in your garage, have at it
SkyRC Thermister connector pinout - Page 1
Forum section: electronics / general

author: pcm81
author_rank: Regular Contributor
timestamp: April 19, 2023, 02:10:42 am
content: I have SkyRC D400 charger which i use to charge NiMH battery pack. The battery pack has a built in thermister: NTCLE100E3103JB0. What i would like to know is:For standard temperature probe connector what are the 3 wires? In most schematics i see V+, GND and thermister reference, is that basically also what i need to connect to the 3 wire "temperature" port? Here is the charger spec:https://www.skyrc.com/Charger/D400_Chargerbut it does not show pin-out for the temperature sensor. Is it something proprietary for their sensor or is there a standard pin-out for these 3-pin connectors?The skyrc temperature sensor is a stand alone unit:https://www.skyrc.com/Temperature_Sensorwith 3 wire interface, does that mean skyrc has power and ground connections internally made to battery V+ and GND on 2 of those wires, so that means i need to add a balance resistor to the NTCLE100E3103JB0 thermister but NOT Vbatt and GNDbatt connections to pin 1 and 3? Basically trying to find some standard if any exist for these temperature hook-ups.Thanks

author: thm_w
author_rank: Super Contributor
timestamp: April 19, 2023, 09:39:55 pm
content: You'll have to figure it out by measuring or opening up the probe that you have.If you are lucky, its a NTC divider inside the probe, 10k between two leads, then 10k NTC between adjacent lead. Measuring resistances between those 3 leads should confirm this.If you are not so lucky, its something like a LM35 or DS18B20 IC in there. Then you'll have to build your own sensor or buy their version.
Picture attachment - Page 1
Forum section: electronics / general

author: Peabody
author_rank: Super Contributor
timestamp: April 19, 2023, 02:45:56 pm
content: I made a post this morning and it wouldn't let me attach a picture as end of post thumbnail. When I browsed for the first attachment line, it stuck my choice as the second line, but left the first line blank. In the end I had to put the picture inline, and ended up with "attaching 1" in the text. What do I need to do to get it to look nice?

author: BravoV
author_rank: Super Contributor
timestamp: April 19, 2023, 02:53:46 pm
content: Use IMG and tweak on attaching the file.https://www.eevblog.com/forum/chat/how-to-make-decent-photographs-for-forum-postsarticlespublications/msg4809449/#msg4809449

author: Peabody
author_rank: Super Contributor
timestamp: April 19, 2023, 04:16:01 pm
content: I tried that, but the picture did not show up in the post at all. I'll try again here.Edit: Ok it worked this time. I guess my mistake before was to attempt to put it in the first line. But you know, it hasn't been that long since I was able to put it in the first line successfully. It would be a lot less confusing to everyone if that could be make to work again. Anyway, thanks for helping me out.
LCSC - anyone noticed high-values orders being delayed? - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 18, 2023, 06:54:23 pm
content: Tracking on my last LCSC order shows it's been sitting in the warehouse for 4 days now.IME most orders take a week to UK, but looking back, one other order took 2 weeks.The thing in common with these two orders is that they were both >$1000I'm wondering if they routinely hold larger orders in case of payment issues.Anyone else seen anything confirming or refuting this ?

author: John B
author_rank: Frequent Contributor
timestamp: April 18, 2023, 08:13:05 pm
content: Which shipping company did you use? I've used DHL and the more economical one (YunExpress? I think), sometimes the parcels do sit for a few days depending on the carrier.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 18, 2023, 08:35:00 pm
content: Quote from: John B on April 18, 2023, 08:13:05 pmI usually use Fedex, but according to the order progress, the delay is at LCSC before it gets to the shipper,

author: John B
author_rank: Frequent Contributor
timestamp: April 18, 2023, 08:45:51 pm
content: Are they shifting stock from their secondary warehouse to the main one?
Starship / SuperHeavy Flight Test into space live - Page 1
Forum section: electronics / general

author: wraper
author_rank: Unknown
timestamp: April 17, 2023, 12:52:55 pm
content: Launch in 25 minutesScrubbed

author: Ranayna
author_rank: Super Contributor
timestamp: April 17, 2023, 01:37:52 pm
content: Am I bad luck?I wanted to watch the Artemis launch, had the time, and that was scrubbed. Was not able to watch the successful start live.Now again i had time and watched live, and again it was scrubbedWell, at least it did not go bang. While that admittedly would have been awesome to watch i prefer successful launches.

author: tom66
author_rank: Super Contributor
timestamp: April 17, 2023, 01:41:09 pm
content: Better to scrub now than RUD when you tried to use that valve!

author: iMo
author_rank: Super Contributor
timestamp: April 17, 2023, 02:03:34 pm
content: ..
Sodium-ion battery to power latest Chinese EV - Page 1
Forum section: electronics / general

author: tom66
author_rank: Super Contributor
timestamp: April 16, 2023, 05:22:46 pm
content: I wasn't aware that this was actually a practical technology yet, and it could still be hype, but CATL are announcing that a "Chery EV" will be powered by a sodium-ion battery.https://twitter.com/catl_official/status/1647604699829518338The early information suggests similar energy density to LiFePO4 but at approximately half the raw material cost. No info on lifetime / weight / power density yet. It apparently performs better at lower temperatures, offering 90% of range at -20C, and can be fast charged 80% in 15 minutes. It is possible that the pack will be a hybrid combining a smaller lithium-ion element to boost peak power output, as one limitation of sodium-ion has been high power delivery, as CATL have spoken about this in the past with sodium-ion.
Intel and ARM honeymoon! - Page 1
Forum section: electronics / general

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 14, 2023, 07:37:39 pm
content: https://www.techspot.com/news/98301-intel-ties-up-arm-build-chips-fabless-semiconductor.html

author: MT
author_rank: Super Contributor
timestamp: April 14, 2023, 08:34:37 pm
content: Yeah I've sumbled upon this article already, couldn't read much more than a few minutes with a lot of fast forward. Dunno about you guys.Surely not the most interesting article I've seen about Intel and Arm.

author: tom66
author_rank: Super Contributor
timestamp: April 14, 2023, 09:36:40 pm
content: It's interesting, but really no different than Samsung building the iPhone's display and CPU - companies follow the money even if it means supplying their competitor. Let's see if Intel manages to compete with TSMC as they pivot towards being a fabless vendor as well as a CPU manufacturer... it's been a bit embarrassing so far.
Guard signal on SMU and VI instruments. - Page 1
Forum section: electronics / general

author: desert
author_rank: Contributor
timestamp: April 13, 2023, 01:04:08 pm
content: Guard is widely used on SMU and VI instruments to avoid leakage current on force high and sense high.Where guard voltage should be generated, before or after current measurement resistor?If generating guard voltage before current measurement resistor, then there is a voltage difference between guard and force/sense high. Sometimes the voltage drop on a current measurement resistor is as high as 2V (it’s current depend).If generating guard voltage after current measurement resistor, then leakage current on guard lines will impact current measurement accuracy.What's the typical hardware implementation on SMU and VI instruments? And why?

author: alm
author_rank: Super Contributor
timestamp: April 13, 2023, 08:30:50 pm
content: I checked the SMU service manuals I had in front of me, Keithley 237 and Keithley 2400, and both take it after the current sensing. The 237 from the current sensing amplifier and the 2400 via the sense line where ever sense is connected (at the binding posts on the back or at the load). See attached block diagrams. I'm sure this (together with the current sensing itself) will introduce some bias current that affects the current measurement, but as long as the bias current is stable, this can be corrected during adjustment. I think your explanation that there could be a substantial voltage drop over the sense resistors is the most obvious one.I would consider asking a moderator to move your topic to the test equipment section (use the "report to moderator" link).

author: desert
author_rank: Contributor
timestamp: April 14, 2023, 05:57:38 am
content: According to Keithley 237 schematic, the voltage drop on current measurement resistor is as high as 10V, then it’s absolutely the right choice to generate guard after the resistor.But I also see some schematics show that guard is generated before the resistor.Any detailed analysis and calculation in this area?Quote from: alm on April 13, 2023, 08:30:50 pm

author: Kleinstein
author_rank: Super Contributor
timestamp: April 14, 2023, 06:16:57 am
content: With the relatively high drop on the shunts the guard should be from behind the shunts. Some of the simplified schematics or block diagrams may be simplified a bit too much.It is usually OK to not have separate guards for the drive and sense lines: the separate sense lines are mainly a thing for higher currents. At low currents the difference is small. The guard lines are mainly a thing for very low currents. Having separate gurad lines would be no real issue - not much effort and not that confusing.
ONLINE COURSES, PLCS, SCADA, ETC - Page 1
Forum section: electronics / general

author: coldcoke
author_rank: Newbie
timestamp: April 13, 2023, 12:08:36 pm
content: Hello members and fellow electronics enthusiasts.I'm reaching out to the community for information on online courses.there's one I have come across being offered by Engineering Institute of Technology (EIT)Professional Certificate of Competency in Programmable Logic Controllers (PLCS) & SCADA SystemsLink to sitehttps://www.eit.edu.au/courses/professional-certificate-of-competency-programmable-logic-controllers-plcs-scada-systems/Does anyone here have any experience / knowledge on this institute ?Does anyone have a suggestion of a simmilar courseBest wishes

author: EEVblog
author_rank: Unknown
timestamp: April 13, 2023, 12:25:48 pm
content: FYI, I asked the OP to post here for help, as I haven't really heard of this mob. Course is US$890
Connector for slightly bigger wire than will fit in JST SM - Page 1
Forum section: electronics / general

author: davethomaspilot
author_rank: Contributor
timestamp: April 13, 2023, 09:17:58 pm
content: The insulation on the wires is too big to fit in the JST SM contacts.Wire size (insulation) is 2 mm diameter. It just won't fit.First, does it really matter? Crimps seem really strong--I can't pull the wire out of the crimp.If it does, can some one recommend a slightly larger connector that's easy to crimp? 1.5 amps, low voltage rating.Just two wires--application is for adding a crimp connector to the 12V side of a 12V to 5V DC/DC.

author: thm_w
author_rank: Super Contributor
timestamp: April 13, 2023, 09:55:47 pm
content: Does it matter for hobby use? no.What AWG wire, you don't have anything thinner? The SM contact is rated 28-22 AWG.https://www.jst.com/wp-content/uploads/2021/03/eSM.pdf

author: davethomaspilot
author_rank: Contributor
timestamp: April 13, 2023, 10:11:33 pm
content: Don't know wire gauge, except it's about .95 mm diameter. 19 or 20 AWG. Can't change it--the DC/DC convertors I have on hand have the wires.Not quite hobby--I'm making 10 assemblies that cost around $1K each. They will be used only once or twice a year, but will be expected to last at least 10 years.The crimp on the wire is really good--it's just that the insulation won't fit under the outer crimp. Thinking about it, I wouldn't think the extra mechanical strength provided by getting the insulation under the crimp would be significant compared to the actual wire. But, I know a "good" crimp requires the insulation to be in the crimp.Found these on Amazon and will give them a try:https://www.amazon.com/Molex-Micro-Fit-Circuits-receptacle-Terminal/dp/B078PZY6SM/ref=sr_1_2?qid=1681422924&refinements=p_n_feature_four_browse-bin%3A18945778011&s=industrial&sr=1-2Thanks!

author: davethomaspilot
author_rank: Contributor
timestamp: April 13, 2023, 10:14:56 pm
content: The maximum insulation thickness for the ones in that link is 1.8 mm--same as the SM that I've used.Outside diameter is 2 mm.I actually shaved some insulation off the wires and got a pair of wires to fit. But, that's too much hassle and I still don't think it adds significant mechanical strength compared to something like 20 AWG wire. But, opinions welcome!

author: thm_w
author_rank: Super Contributor
timestamp: April 13, 2023, 10:25:10 pm
content: If this is for a high end product, then yeah just get an appropriate connector that is rated for ~19 AWG wire.Mini fit jr. can be 18-24 AWGMicro fit contacts you linked are 20-24 AWG so might work.Probably thishttps://www.molex.com/pdm_docs/ps/PS-44300-001.pdfSpec states max outside insulation diameter 1.85mm

author: davethomaspilot
author_rank: Contributor
timestamp: April 13, 2023, 11:03:47 pm
content: QuoteTwo small--measures 2.0 mm.SH (what I have) is spec'ed at 1.8. Definitely too small.Wire fits fine though.

author: wraper
author_rank: Unknown
timestamp: April 13, 2023, 11:19:22 pm
content: If it's vibration free environment, wires won't be bent in use and it's just a one-off, strip more insulation and crimp stripped part only.
ChatGPT makers threatened with defamation suit for creation of false statement. - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: April 12, 2023, 11:58:12 am
content: https://www.washingtonpost.com/technology/2023/04/06/chatgpt-australia-mayor-lawsuit-lies/Quote

author: Neutrion
author_rank: Frequent Contributor
timestamp: April 12, 2023, 01:48:45 pm
content: Good news! Only pity is, that not some LMBTQ wokeist were targeted, or Gwyneths pussy, because than the issue would fill the headlines for months with Sky News live coverage included." Miss Jason Wokeman was falsely accused by AI stating that "it" is a member of a hidden heterofobic network with some dark agenda. She was even accused with citing the Bible so a finnish expert team will be part of the investigation team. This case by far is the most imminent threat to democracy, and human rights on the planet.""Gwyneths vagina -according to a study from the university of Newsouthsmoscow- has an an entirely different smell than the advertised product, and many experts claim that its smell can also rapidly change in time on a broad scale. The court case with Gwyneth experts, AI experts and judges with sensitive noses will be broadcasted live by countless new channels."

author: temperance
author_rank: Super Contributor
timestamp: April 12, 2023, 02:53:04 pm
content: QuoteTragicomic

author: m98
author_rank: Frequent Contributor
timestamp: April 12, 2023, 04:59:32 pm
content: It sais a lot about WP to be publishing such technologically illiterate nonesense...

author: SiliconWizard
author_rank: Super Contributor
timestamp: April 12, 2023, 07:38:55 pm
content: Quote from: temperance on April 12, 2023, 02:53:04 pmTrue.But the underlying point still holds.This raises many concerns regarding IP, personal image, and a lot more.Of course the answer at this point is: no one should trust any of those chat bots' output, ever.But the problem is that it still *communicates* something and thus is still being *heard*It's like any random user of a social network - if they defame someome, even if said user is a "nobody" and has no credibility, it has the potential to harm the defamed person. We all know this.So the same will happen with AI bots, except probably worse, as people will tend to trust a machine's output more than they trust other humans.
Anodising Made Simple - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: April 10, 2023, 05:43:57 pm
content: I seen this video it may be of interest to you.simple anodising with a battery or two or more.distilled waterbaking powder - BoraxAcetoneanodization color with 9 volt batterys see video.9 18 27 36 45 54 63 72 81 90Annoyingly simple anodising with a batteryanodisinghttp://sciencewithscreens.blogspot.com/2016/08/experiment-60-anodizing-titanium-into.htmlsee which voltages anodizedhttp://www-personal.umich.edu/~bobden/titanium-spectrum-web-2.jpgbuild a power supply that has a voltage range for 24 to 90 at 1AA standard 9V battery has about 400-600 mAh capacity

author: mendip_discovery
author_rank: Super Contributor
timestamp: April 10, 2023, 07:38:03 pm
content: If I was using titanium bolts for projects saving money using a 9V battery to anodised them would be a little daft.

author: thm_w
author_rank: Super Contributor
timestamp: April 10, 2023, 09:47:32 pm
content: Yeah anodizing titanium hardware is fairly easy. You don't even need a tank you can just use aluminum foil, baking soda, and a paper towel to brush the color on.The hard part is prepping a large smooth surface and getting that to look good. Or getting specific color shades to show up well.Quote from: mendip_discovery on April 10, 2023, 07:38:03 pmYes titanium bolts are expensive but custom color anodized ones more so, not sure what you are getting at here.

author: mendip_discovery
author_rank: Super Contributor
timestamp: April 11, 2023, 04:09:40 am
content: My point being that if I have just spent >10x the price of a normal bolt for a titanium one I am not going to finish off that expense by using a cheap solution to have them anodised.I have titanium bolts in the shed, I even have the drilled ones for racing and I have yet to find a use for them as they are not somthing you use for the fun of it.

author: jonovid
author_rank: Super Contributor
timestamp: April 11, 2023, 08:59:02 am
content: I may have overestimated the use of expensive titanium as in contrast to the way cheap aluminum is widely used inelectronics enclosures and fasteners. as the video thumbnail had suggested.as for the use of 9 volt batteries shown in the video. a lab power supply is the best for electroplating.a lesson to myself, dolots of researchbefore posting anything.titanium vs cheap aluminum. video thumbnails can be misleading.

author: thm_w
author_rank: Super Contributor
timestamp: April 11, 2023, 09:38:13 pm
content: Quote from: mendip_discovery on April 11, 2023, 04:09:40 amCheap or expensive anodizing doesn't really matter for Ti, its just for the color.You can probably use 316 stainless bolts in most applications requiring corrosion resistance (salt spray), but in some cases its just too soft and weak vs Ti.

author: helius
author_rank: Super Contributor
timestamp: April 12, 2023, 06:25:14 pm
content: Caswell Platingsells kits for all kinds of metal plating and anodizing procedures, and publishes handbooks that lay out every aspect of these processes.
Can I do a job in electronics with a degree in controls and systems? - Page 1
Forum section: electronics / general

author: shaheansar
author_rank: Contributor
timestamp: April 09, 2023, 09:26:04 am
content: So I'm graduating with my bachelor's in EE, and I've received an admit from TU Delft for their Systems and Controls MSc. I'm interested a lot in robotics so I figure it's a great option for it (They have an MSc for Robotics as well, but it's too shallow IMHO and the electives aren't to my taste). Here's the thing, I love doing electronics stuff and I don't want to stop doing it. So after I graduate, would it be possible for me to settle in as an EE working on robotics or should I look into another program? I plan on working in the Netherlands, or Berlin.

author: BravoV
author_rank: Super Contributor
timestamp: April 09, 2023, 09:42:05 am
content: Quote from: shaheansar on April 09, 2023, 09:26:04 amWhats wrong with India ?

author: tooki
author_rank: Super Contributor
timestamp: April 09, 2023, 06:16:16 pm
content: Quote from: shaheansar on April 09, 2023, 09:26:04 amI would investigate two avenues:1. Try and find some engineering managers at companies that do the kind of work you’re into and ask them directly.2. Look for some job listings for the kinds of positions you ultimately want, and reach out to their recruiters and ask. They should be able to give you an idea of whether they’d consider your planned degree.My hunch — and it’s purely gut feeling — is that you’ll be fine. A lot of electronicsiscontrol, so being an expert in control systems seems very applicable to me. But I’d definitely reach out to employers to find out.

author: tooki
author_rank: Super Contributor
timestamp: April 09, 2023, 06:17:07 pm
content: Quote from: BravoV on April 09, 2023, 09:42:05 amNothing. But OP doesn’t plan to be there, for reasons that are none of our business.

author: 2N3055
author_rank: Super Contributor
timestamp: April 09, 2023, 08:18:29 pm
content: Quote from: BravoV on April 09, 2023, 09:42:05 amTU Delft is in Netherlands....

author: shaheansar
author_rank: Contributor
timestamp: April 10, 2023, 02:08:21 am
content: Will do. Thank you for the adviceIt's a relief to hear that

author: shaheansar
author_rank: Contributor
timestamp: April 10, 2023, 02:10:46 am
content: Nothing, a career as an EE is just plain boring in India. I've asked seniors and some people I know and most of the job opportunities just involve implementing designs that have been outsourced. I want more, this is my passion. My growth would hit a brick wall if I chose to stay here. Most people switch over to management or software. I wouldn't have done a degree in electronics if I wanted to end up there.

author: EPAIII
author_rank: Super Contributor
timestamp: April 12, 2023, 09:55:17 am
content: If you are unsure about getting a job elsewhere, perhaps working in India for a year or two to get some experience under your belt may be a good idea. Managers who are hiring like to see at least some experience.
What's the most exotic part you found at a non-specialist distributor - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 10, 2023, 07:23:50 pm
content: I vote thishttps://www.digikey.ca/en/products/detail/knowles-dielectric-labs/PDR06120/11481546

author: mendip_discovery
author_rank: Super Contributor
timestamp: April 10, 2023, 07:32:55 pm
content: Looks like a SMD form of the flux capacitor.

author: trophosphere
author_rank: Frequent Contributor
timestamp: April 11, 2023, 03:03:17 am
content: I've used those before for a previous project.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 11, 2023, 03:37:50 am
content: Forgot the part number but the most unusual part I specified into a design was a chip that emulated a switch matrix. With a SPI command, any pin of port X can be connected/disconnected to any pin of port Y, and multiple such connections can be made at once. Not surprisingly, it was for a test jig to test the keyboard input functionality of an embedded processor.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: April 11, 2023, 01:40:44 pm
content: Quote from: trophosphere on April 11, 2023, 03:03:17 amSweet! Plus it needs to be wire bonded according to the datasheet? You did that? Or some sort of tiny solder job?

author: trophosphere
author_rank: Frequent Contributor
timestamp: April 12, 2023, 03:55:20 am
content: Quote from: Alex Eisenhut on April 11, 2023, 01:40:44 pmAnother person did the wire bonding. I did some of the layout. It was for a medical sensor project using an UWB transceiver.
The new aperiodic monotile discovered - Page 1
Forum section: electronics / general

author: Picuino
author_rank: Super Contributor
timestamp: April 09, 2023, 06:46:18 pm
content: Interesting new aperiodic monotile discovered.https://aperiodical.com/2023/03/an-aperiodic-monotile-exists/I don't know if it will have any application in electronics manufacturing, but at the very least it is quite curious and satisfying to look at.

author: tooki
author_rank: Super Contributor
timestamp: April 09, 2023, 09:30:32 pm
content: Most of my tattoos so far are geometric patterns, now I have more options for future ones.

author: Picuino
author_rank: Super Contributor
timestamp: April 09, 2023, 09:53:47 pm
content: My version:The red tiles are in a mirrored position (face down).No 2 tiles of the same color touch each other.
DON'T PANIC for batteries, Hell No. - Page 1
Forum section: electronics / general

author: Sarvesaa
author_rank: Contributor
timestamp: April 07, 2023, 02:39:49 pm
content: Hey everyone,I am a big fan of AvE.I watched the video. He explained the theory of lead acid battery very well, but when said" A POSITIVE ANODE, NEGATIVE in CATHODE"that trigged me, becauseanode act as negative terminalin agalvanic cellandcathode acts as positive terminal.Anode acts as Oxidation electrode where electrons lost by Pb to the circuit, returning to the cathode where they are gained by PbO2.He made this mistake by refering to "DON'T PANIC". Which is only right for aelectrolytic cell.This post is not made to criticize the mistake, but there is a lot of wrong literature in the internet regarding the topic.

author: Siwastaja
author_rank: Super Contributor
timestamp: April 09, 2023, 07:22:34 am
content: Terms "anode" and "cathode" are arbitrary and ridiculous. For example, they are defined the opposite way for capacitors vs batteries.I have been working with batteries and battery industry experts for a long time and I still just simply Google every time, because I don't remember.Therefore, it's not a big mistake to mix them up. I have evidenced this happening to people who actually design lithium ion cell manufacturing processes. And many just use the terms "positive electrode" / "negative electrode".

author: Sarvesaa
author_rank: Contributor
timestamp: April 09, 2023, 11:18:05 am
content: Yes, its not a big mistake.Its just more nice to say positive and negative electrodes.But what I wanted know say is to not use DONT PANIC in galvanic cells and batteries.
A bit specific - anyone run Digilent Waveforms under Nixos? - Page 1
Forum section: electronics / general

author: julian1
author_rank: Frequent Contributor
timestamp: April 09, 2023, 11:25:56 pm
content: Probably a longshot, but I noticed a couple of forum members use nix/nixos.Digilent provide .deb and .rpm downloads for Waveforms, but these would need binary patching of the sym/lib paths.The alternative is probably a container with X forwarding (Docker et al) or wine.

author: julian1
author_rank: Frequent Contributor
timestamp: April 10, 2023, 08:19:17 am
content: I can't delete the topic now which is probably only of narrow interest. But to answer the question, a Nix flake is available which I missed.https://github.com/liff/waveforms-flake