hybridfree/eevblog-posts huggingface dataset:
Looking for comments on this circuit - Page 1
Forum section: electronics / general

author: beandigital
author_rank: Contributor
timestamp: May 19, 2020, 06:19:37 pm
content: I inherited this circuit from someone who left the company. It seems like nonsense to me, but looking for other people to comment. I guess they where thinking that they could create some form of opamp attenuator. Anyway if I have missed the point then happy to be wrong. Thanks

author: Benta
author_rank: Super Contributor
timestamp: May 19, 2020, 06:47:10 pm
content: Seems like a non-inverting amplifier with response shaping. No idea what the purpose is.

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 19, 2020, 06:52:58 pm
content: It definitely IS an attenuator.Given the LMH6609 is a very fast opamp, the purpose, as I see it, is effectively a wideband buffered attenuator.

author: TimFox
author_rank: Super Contributor
timestamp: May 20, 2020, 03:33:54 pm
content: It seems to be a voltage follower, with close to unity gain, and approximately 50 ohm input impedance. The slight attenuation of the 10 ohm series resistor and 47 ohm shunt resistor at the non-inverting input is only partially compensated by the slight loss in the feedback network to the inverting input.
Windows 10 Attention to Detail or lack of - Page 1
Forum section: electronics / general

author: SimonR
author_rank: Regular Contributor
timestamp: May 15, 2020, 10:18:42 pm
content: So I'm just sitting here watching a forced update on my windows 10 desktop PC while I wait for my Windows 8 Laptop to finish compiling some code. I don't use the desktop much anymore.Its been stuck on the picture of the lake in some mountains for quite some time. Its quite a nice picture until you notice that at the bottom of the picture is a red rucksack, probably left there by the photographer. Competition winner maybe? Close but no cigar.Sums up windows 10 entirely I think

author: Benta
author_rank: Super Contributor
timestamp: May 15, 2020, 10:26:17 pm
content: Why are you watching? Win 10 updates take hours.I'm so damn happy with my Lubuntu 20.04 laptop where everything works, operates much faster and an update takes 30 min. max.Happy watching

author: Matty
author_rank: Contributor
timestamp: May 15, 2020, 10:34:45 pm
content: I never noticed that. I just found the picture again and Ireconit has to be attention to detail. It's too perfectly placed.

author: SimonR
author_rank: Regular Contributor
timestamp: May 15, 2020, 10:54:03 pm
content: I was getting irritated because the fan kept running full speed and destroying my concentration.I waggled the mouse to wake up the screen and saw that it looked like it had finished its last reboot so I waited a bit and found out it hadn't nearly finished.I'm waiting for it to turn off now, might have to just pull the plug

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 15, 2020, 11:32:41 pm
content: Quote from: SimonR on May 15, 2020, 10:54:03 pmYeah, looks like the best favor you can do your computer when it's haunted by Win10 updates is to put it out of its misery.
Weller WR 3M - Page 1
Forum section: electronics / general

author: hillartube
author_rank: Newbie
timestamp: May 15, 2020, 03:33:17 pm
content: Hi everyone!I have defective rework station Weller WR 3M. There is no main transformer. Anybody can tell me, please, the parameters of this transformer (number of windings, voltage, current) and how to connect it to printed circuit board.Thank you.
HP Journal download - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: May 14, 2020, 12:14:55 pm
content: 478 items, 3.3GB. Just put the list into your download manager.

author: tooki
author_rank: Super Contributor
timestamp: May 14, 2020, 09:11:08 pm
content: Nice!! I wish companies still published that kind of information, instead of keeping everything so secret now. It pains me to think of how much knowledge is lost when companies keep stuff secret, and then eventually go under and everything gets trashed.And here is the file unzipped. Absolutely no need for such a tiny file to be zipped.

author: Circlotron
author_rank: Super Contributor
timestamp: May 15, 2020, 04:00:42 am
content: Quote from: tooki on May 14, 2020, 09:11:08 pmActually there are two reasons :-) first, seeing there is a great deal of self similarity in that text file I knew it would compress well, and 25:1 is not bad. Main reason though is when the file is unzipped it does some kind of CRC check to test the integrity of the file and if it has been corrupted it would let you know. But yeah, that size file is nothing nowadays.

author: daqq
author_rank: Super Contributor
timestamp: May 15, 2020, 06:27:25 am
content: Awesome! Thanks, downloading now. This is certainly much better than the current state of things where most of the stuff given out by companies is "Here's a black box, if you connect this here and this here it'll do that with an efficiency of 94%!". It's understandable though.

author: RoGeorge
author_rank: Super Contributor
timestamp: May 15, 2020, 08:26:50 am
content: Includes links from many others:HP Journal and alike
7.83HZ Schumann Ultra-low Frequency Pulse Generator - Page 1
Forum section: electronics / general

author: ETITsynthesizer
author_rank: Contributor
timestamp: May 14, 2020, 03:00:52 am
content: I'm genuinely curious. can this device generate some static electricity or some magnetic field at such low frequency that would actually make my tea ceremony better. that is what the description says. if it works, how does it work. how do you calibrate the frequency to match the natural Schumann waves of the earth? how do you measure ultra low frequency RF? how does the device interact with me?https://www.ebay.com/itm/7-83HZ-Schumann-Ultra-low-Frequency-Pulse-Generator-with-USB-Cable-FM783/383251125458

author: OwO
author_rank: Super Contributor
timestamp: May 14, 2020, 05:25:24 am
content: It's a quack device. That antenna is nowhere big enough to radiate any meaningful far fields at 8Hz, and even if you do build a huge antenna your signal is going to be drowned out by all the lightning strikes.

author: ETITsynthesizer
author_rank: Contributor
timestamp: May 14, 2020, 01:44:32 pm
content: can I just wear it on my head for a limited time?

author: tom66
author_rank: Super Contributor
timestamp: May 14, 2020, 01:50:49 pm
content: You can wear it on your head. It won't do you any harm, but it also won't do anything. So not sure what you intend to achieve, other than looking a bit peculiar.

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 14, 2020, 01:51:35 pm
content: A tinfoil hat would probably be more effective.
Info & help on Quick 881D  110v to 220v - Page 1
Forum section: electronics / general

author: Sapsford55
author_rank: Newbie
timestamp: May 08, 2020, 10:19:16 pm
content: Hidoes anybody know whether the power board (856D powerdrive V2.is dual voltage? I have acquired a 110v version with the USA plug directly wired and I have searched the internet to see if it's compatible with 220v (label on the case 110v). However, I have seen several teardowns of the 220v version and all the components appear to be the same with the same ratings.I know I should just buy a step-down transformer but at 1300w (and a generous PF of 0.7 for a switchmode power supply) it would require at least a 1875VA transformer and probably bigger that is a meaty and heavy tranny! Whereas if it's just a matter of replacing the plug?If I used an auto-transformer and slowly raised the voltage anybody have any ideas how I analyse the performance to detect failure before it happens! E.g. current draw FET/TRIAC temp etcAny help will be greatThanks

author: wraper
author_rank: Unknown
timestamp: May 10, 2020, 09:07:44 pm
content: Dunno about board but you certainly will need to change heater if plan using it on 230V. This board seems to use split supply as in older ATX PSUs that works as voltage doubler when powered from 120V by changing switch position. Capacitor voltage rating is the same. So there might be some jumper on PCB which allows to change voltage. Also optocoupler circuit for mains zero crossing sense might need resistor value change or something like that.
Switch terminology and the eBay wasteland - Page 1
Forum section: electronics / general

author: calzap
author_rank: Frequent Contributor
timestamp: May 09, 2020, 02:56:58 pm
content: Needed some mini DPST toggle switches, so looked on eBay (U.S. version). Astounded to learn how many sellers don't know a pole from a throw ... never mind exotic terms like center-off and momentary. Actually saw some single throw switches advertised as center-off ... how does that work?Never found the switches I need ... off to DigiKey. Be careful out there!Mike in California

author: Cyberdragon
author_rank: Super Contributor
timestamp: May 09, 2020, 04:07:32 pm
content: Maybe the switch only moves to one side and stops in the middle?But seriously...this is like electricity 101 stuff...
Hitachi V680 Instruction Manual needed - Page 1
Forum section: electronics / general

author: gkmaia
author_rank: Frequent Contributor
timestamp: May 11, 2019, 10:41:35 am
content: Anyone with a copy of the INSTRUCTION manual for a Hitachi V680 oscilloscope?

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 19, 2020, 03:06:57 pm
content: Hi!I've bought a V680 and will scan the instructions when I receive it!The instructions will also be provided in a full new Operating & Service Manual that I shall author from the scope itself and the atrocious bloody scan on Elektrotanya for this!Chris Williams

author: gkmaia
author_rank: Frequent Contributor
timestamp: May 09, 2020, 01:15:59 am
content: I am attaching the plots here as separate images. I tried but could not get them attached to the same PDF files as the manual.
digikey website down? Anyone else? - Page 1
Forum section: electronics / general

author: KL27x
author_rank: Super Contributor
timestamp: May 08, 2020, 02:32:56 am
content: Trying to browse, every category of components I click on takes me to a near-blank white page that says"Requested URL Rejected"I'm using a fairly new computer, and this might be the first time I have visited Digikey on it.

author: AlfBaz
author_rank: Super Contributor
timestamp: May 08, 2020, 02:37:46 am
content: US digikey is working fine from ozHave you tried downforeveryoneorjustme dot com?

author: KL27x
author_rank: Super Contributor
timestamp: May 08, 2020, 03:08:03 am
content: Just tried it, and that site gets stuck on the loading (...will take up to 5 seconds) screen.It's probably my security or cookie settings on the new computer. Thanks. Digikey maybe wants to have certain cookies allowed/installed.

author: DrG
author_rank: Super Contributor
timestamp: May 08, 2020, 03:20:01 am
content: Quote from: KL27x on May 08, 2020, 03:08:03 amWorks fine for me. BTW: The opening page makes you accept cookies to continue.

author: helius
author_rank: Super Contributor
timestamp: May 08, 2020, 03:49:01 am
content: If you use a DNS blacklist you may need to turn it off for certain sites. A lot of shopping sites now require googletagmanager, googletagservices, googlesyndication...
Cheap CPU fan LED not working - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: May 06, 2020, 07:24:12 am
content: I have a cpu fan that has 4 red LEDs. Today I took the side panel off and noticed one of the four LEDs is off. This is not a big deal because I have a case that is mostly solid and you only see glimmers from inside. I am only concerned about a dangling wire somewhere. I don't want to take the fan out to inspect it, but it is either a case of a connection point is messed or a LED has died. The dangling wire problem could lead to a short. I have a photo earlier of the fan working, and it seems they were all working then. So that makes me feel it just died. Does this happen often?I had a case I got cheap once because they had problems. One case what happened is a molex plug powered up some LEDs on the front. I noticed that touching certain spots made the LEDs come on briefly. I took it apart and noticed the LED leads were touching I guess a conductive channel so I re snotted them and they were fine after that. I think this means that at some point a 5V line was basically shorted. What kind of effect on the PSU and the rest of the computer could this have? That case, several years later, one of the 4 blue LEDs no longer works as well. I think all these were missing the resistor you usually put in the path of a rail.
NASA Mission Control in the Apollo era - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: May 04, 2020, 11:56:38 pm
content: A couple of great articles with lots of details. In the first, the writer visits the restored Mission Operations Control Room, accompanied by Seymour “Sy” Liebergot, an EECOM controller on eight Apollo missions (including 11 and 13; you can hear him on the Apollo 13 audio mentioned earlier):<https://arstechnica.com/science/2012/10/going-boldly-what-it-was-like-to-be-an-apollo-flight-controller/>And this article describes the functions of each MOCR console position:<https://arstechnica.com/science/2019/12/apollo-flight-controller-101-every-console-explained/>This NASA film, “This Is Mission Control”, gives some really interesting details on the organization and duties of the various flight controller positions at Mission Control, and shows the people and equipment behind the scenes of the Mission Operations Control Room, which was the tip of the iceberg in terms of the vast amount of people and equipment at the center. The last part focuses on how it all worked during the Apollo 13 crisis:<>

author: TomS_
author_rank: Frequent Contributor
timestamp: May 06, 2020, 10:37:48 am
content: Really interesting video. Amazing how much computing power there was behind the scenes at the time.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: May 06, 2020, 01:15:28 pm
content: I have Sy Liebergot's book, "Apollo EECOM: Journey of a Lifetime". Interesting inside view.Dig the hep background music!

author: AlbertL
author_rank: Regular Contributor
timestamp: May 07, 2020, 02:47:57 am
content: One interesting piece of information from these sources is that the CRT displays at the controllers’ consoles did not directly display computer output. They were CCTV monitors, displaying an image from a camera. The camera viewed an optical system which superimposed a 35mm slide containing data headings over a mainframe computer CRT display which showed just the raw numbers. The Mission Control film says the system had 40 TV channels and 600 slides.Imagine the work involved just to add or move a data field on a particular screen. The mainframe programming would have to be modified to put the data in the correct place on the correct CRT display layout, the headings would be have to be changed on the slide artwork, the slide would have to be created photographically and loaded into the display system. All of those tasks would have been done by different specialists, and it all would have to be coordinated and checked - it would not be good to mix up, say the O2 Tank #1 Pressure and the H2 Tank #3 Pressure fields on a controller’s display!
Spotted another "solar roadway" clone: Platio - Page 1
Forum section: electronics / general

author: DG2MMT
author_rank: Newbie
timestamp: May 04, 2020, 11:49:21 am
content: I don't know why, but the idea refuses to die…http://platiosolar.com/Solar pavement. On their start page one can see highly glossy solar cells on the ground.Looks like an accident waiting to happen when they get wet like when it rains…

author: SiliconWizard
author_rank: Super Contributor
timestamp: May 04, 2020, 12:38:30 pm
content: Well, at least they are not targetting roadways here, but relatively limited areas on pavements.Could still be a bit unsafe for people walking (when it's wet), and probably not worth it in terms of ROI, but it's not nearly as bad as solar roadways.

author: jogri
author_rank: Frequent Contributor
timestamp: May 04, 2020, 12:55:19 pm
content: The website of the german distributor has a lot of amusing infos, i'll just quote how they want to enhance the friction:QuoteCause roughing up the surface was always a good idea... But hey, at least they are somewhat realistic and only claim ~170 W peak per m2, but that's probably still way too optimistic.They also say that the impact strength is 200N/m2, whatever that is supposed to mean.

author: SerieZ
author_rank: Regular Contributor
timestamp: May 04, 2020, 01:31:50 pm
content: Not as bad as solar Roadway... are we already in the bargaining phase with those Charlatans?Sounds maybe harsh but I do think at least SOME research is warranted before companies like this get a grant by elected Officials payed for with the Money of Mrs. and Mr. Taxpayer.
Cpu damage, it this one a gonner? - Page 1
Forum section: electronics / general

author: Refrigerator
author_rank: Super Contributor
timestamp: May 02, 2020, 11:38:25 am
content: Bought a used cpu and the seller said it had some minor damage.Yeah right, looks more like this cpu kissed a wall at mach 3.Looking at the pinout it looks like the damage is around the bclk area and the missing pin happens to be ground.

author: Gyro
author_rank: Super Contributor
timestamp: May 02, 2020, 11:45:30 am
content: I think that's a case of a CPU with complete damage - It's a pretty binary thing (no pun intended).It's not just that pad, it's the de-lamination of the PCB which will probably have broken buried vias and tracks from other pads.Probably not your wisest purchase.

author: Refrigerator
author_rank: Super Contributor
timestamp: May 02, 2020, 12:10:08 pm
content: Holy crap ir bloody works

author: Gyro
author_rank: Super Contributor
timestamp: May 02, 2020, 01:32:12 pm
content: Quote from: Refrigerator on May 02, 2020, 12:10:08 pmI think I'd agree with that sentiment!

author: amyk
author_rank: Super Contributor
timestamp: May 03, 2020, 11:18:16 pm
content: You're lucky, but in general CPUs have a lot of redundancy in their pinout (mostly power/ground) because they need to handle a lot of current; performance at high load may be slightly compromised by that damage. I recall reading an Intel datasheet for a BGA part that even mentioned x% of balls may fail over time with no functional effect.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 04, 2020, 04:19:25 pm
content: Wow. Maybe it was only Mach 1.5.

author: Jeroen3
author_rank: Super Contributor
timestamp: May 04, 2020, 06:13:42 pm
content: What about all the buried layers? Such carrier board is like 16 layers?

author: amyk
author_rank: Super Contributor
timestamp: May 05, 2020, 04:59:26 am
content: Quote from: Jeroen3 on May 04, 2020, 06:13:42 pmCopper is mildly flexible.
Good book about smart grids? - Page 1
Forum section: electronics / general

author: bonzer
author_rank: Regular Contributor
timestamp: May 03, 2020, 04:44:23 pm
content: Hello everyone! I want to read a good book by my own about smart grids, but closer to the electronic point of view. I know much about power electronics and electric drives. Could you please suggest me any?

author: engrguy42
author_rank: Frequent Contributor
timestamp: May 03, 2020, 05:39:19 pm
content: Are you trying to find out what a smart grid is? Are you trying to understand the details of how the inverter-based systems respond? Something in-between?I think you need to specify what area you're looking for info on, because it's a HUGE topic. You might want to search thru some of the many many IEEE documents on the various smart-grid related topics. There's a zillion of them. I like to do simulations using some of the built-in libraries in Matlab/Simulink/Simscape to better understand the performance of solar arrays and inverters, etc.But it all depends on what you are interested in. Telecommunications? Control systems? Power systems? Disturbance response? and on and on....

author: cdev
author_rank: Super Contributor
timestamp: May 03, 2020, 07:42:22 pm
content: The ACM is an international organization for computing pros and they have a digital library that has reams of information about every aspect of computing. Its temporarilly free, because of the coronavirusdl.acm.org
Hide and seek - Page 1
Forum section: electronics / general

author: PerranOak
author_rank: Frequent Contributor
timestamp: May 02, 2020, 05:07:57 pm
content: I’ve just seen/realised what those spring things are that come with scope probes - brilliant idea!Problem is, I left them in the bag the probes came in with a load of other gumph and now I can’t find them. I thought they were in an old filing cabinet but no.Can anyone tell me where I left them?Cheers.

author: coppercone2
author_rank: Super Contributor
timestamp: May 02, 2020, 10:45:32 pm
content: get small organizer box for this stuff

author: TerraHertz
author_rank: Super Contributor
timestamp: May 03, 2020, 09:48:50 am
content: Quote from: PerranOak on May 02, 2020, 05:07:57 pmThey are in the last place you will look.You'd better get started, eliminating all the places before that.

author: PerranOak
author_rank: Frequent Contributor
timestamp: May 03, 2020, 10:15:32 am
content: Darn! You're completely correct. Still, it gives me something to do under … you-know-what!

author: RoGeorge
author_rank: Super Contributor
timestamp: May 03, 2020, 11:24:40 am
content: Maybe you don't need to find them at all:
Attempt at analyzing an SD card image file - Page 1
Forum section: electronics / general

author: Andrey_irk
author_rank: Regular Contributor
timestamp: May 02, 2020, 02:33:43 am
content: Hi guys,I have an image file that was taken from an SD card of come device. What are the ways out there to analyze such an image on a binary level without mounting the image on an actual card?Any suggestions are much appretiated.

author: Halcyon
author_rank: Unknown
timestamp: May 02, 2020, 03:01:25 am
content: What sort of data are you wanting to get back?You could try just mounting the image in something like XWays Forensics/WinHex or another similar tool and see if will parse the file system. Otherwise if you want to carve for particular files, QPhotoRec does a good job with media files, or GetDataBack Free is also not bad.If you just want to look at the raw data, WinHex, HxD or any hex editor of your choice will do.

author: magic
author_rank: Super Contributor
timestamp: May 02, 2020, 06:59:16 am
content: First off, Windows is rubbishOnce you have seen the light,Code:cp image.bin backup.bin <- just to be safefile image.binfdisk -l image.bin# if it contains partitions, thenlosetup -P -r -v -f image.binfile -s /dev/loop*# if they look like reasonable filesystemsmount /dev/loopNpM /tmp/dummyls /tmp/dummyYou get the idea

author: Halcyon
author_rank: Unknown
timestamp: May 03, 2020, 05:55:38 am
content: Quote from: magic on May 02, 2020, 06:59:16 amSo, SO true.
Installing APK To SD Card Android  - Page 1
Forum section: electronics / general

author: nvidia
author_rank: Regular Contributor
timestamp: May 02, 2020, 11:39:24 pm
content: i got a cheap android phone on black friday last year for 18nzd free shipping to mess around its running andoid 9.0 gothe only downside is the internal storage is only 4gb most of that is taken up by the os so there is less then 400mb free space after i removed the app storearound December last year i bought a 32gb sd card for 7.50nzd i have now installed it as the internal memoryit works fine and games and app install to the sd card fine only problem if the apk requires obb files when i launch the game and it downloads the required files or an update it says i have to free up some space i have more then enough spacewhat can i do?
help in difficult college work - Page 1
Forum section: electronics / general

author: alex123
author_rank: Newbie
timestamp: April 19, 2020, 09:25:43 pm
content: Hello everyone, I am a student of electronics chile.I have this exercise which is difficult, I already solved 1.1if they would help me solve or give ideas to solve,Thanks a lot

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: April 21, 2020, 11:11:30 am
content: Hi Alex,for 1.2 you might omit the inter-electrode capacitances and assume that all the capacitors present (those 1uF and 10uF) are an AC short.Which books are you using?

author: alex123
author_rank: Newbie
timestamp: April 21, 2020, 10:28:45 pm
content: hello pardo-bssowe are using the book Microelectronic Circuits Sedra y Kenneth C. Smith

author: StillTrying
author_rank: Super Contributor
timestamp: April 22, 2020, 12:10:22 am
content: Whoever set that "problem 1" didn't know what they were doing.The input impedance is about 9k, output 6k8, and voltage gain about 500, in theory.I can't find that question in the book, or the answer in the answers book.

author: DimitriP
author_rank: Super Contributor
timestamp: April 22, 2020, 12:43:18 am
content: QuoteThe problem doesn't "read" like the book, that's for sure

author: alex123
author_rank: Newbie
timestamp: April 22, 2020, 01:19:45 am
content: Hello everyone ,This is a exercise that my teacher saw on the internet.the exercise is not in the book, it is only the guide book of the course

author: alex123
author_rank: Newbie
timestamp: May 01, 2020, 11:54:39 pm
content: in question 1.1hfe1 and hfe 2 = 100, veb = 0.7 (data taken from datasheet)Ib1 = -268 nA, Ib2 = 7.49 uAIc1 = -26.8 uA, Ic2 = 748.8 uAI am working on the following questions

author: StillTrying
author_rank: Super Contributor
timestamp: May 02, 2020, 01:57:06 pm
content: "I am working on the following questions"How many weeks do you get for each question.I've done it the easy way.
Can someone please explain???? - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: May 07, 2020, 01:00:08 pm
content: There WAS a new post here, (I can't see who it was now!), where the link WAS...https://www.eevblog.com/forum/chat/swiss-soldiers-fight-covid-19-armed-with-bluetooth-appIt was his first post, evidently... and I replied. Talking about an Australian BlueTooth App.Now when I try to view it, it says......Gee... I wonder who's toes I stepped on!! (not really 'wondering')

author: GlennSprigg
author_rank: Super Contributor
timestamp: May 07, 2020, 01:56:09 pm
content: I didn't say WHO, but maybe said too much in saying that a CERTAIN major person has voiced his opinion to NOT accept this new 'App'. I've changed my shirt & jumper recently, and there are/were NO Tickets attached!!!
Free Micro-Cap - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: May 01, 2020, 08:26:55 am
content: Free to download and use without a HASP key, thank you to the former Spectrum Software company.http://www.spectrum-soft.com/download/download.shtmThis is what it can dohttp://www.spectrum-soft.com/download/mc12_brochure.pdfMicro-Cap also have some RF goodies, for example Smith charts, that are not present in other simulators e.g. LTSpice.

author: Gyro
author_rank: Super Contributor
timestamp: May 01, 2020, 12:51:09 pm
content: You're a bit slowhttps://www.eevblog.com/forum/projects/microcap-12-is-free-(as-in-beer)-now/Worth the reminder though.
How do I filter large youtube channels lacking playlists - Page 1
Forum section: electronics / general

author: vis1-0n
author_rank: Contributor
timestamp: May 01, 2020, 08:54:37 am
content: Many youtube channels do not have playlists, and even then nor do the playlists provide a perfect navigation system. Some active channels will have 2-3 posts per week, which amounts to a lot of videos over a few years. With infinite scroll it becomes difficult to resume a channel you are exploring (especially at a later date).Features I would like to use is keyword (like "Chicken" in a cooking Channel, "pests" in a gardening channel), and date added (I would like to browse Feb 2017-May 2017 in a session for example)I understand that Youtube was not built for large channels, and these are pretty much the exception. Google pushes search as the navigation element. This does bury exploring content. Does anyone know of a site or tool that does allow one to query the Youtube API by providing the channel name (for examplehttps://www.youtube.com/user/EEVblogorhttps://www.youtube.com/user/adafruit) which would return a listing of video captions with url/video ID (and dates)?A cursory look shows that there are Youtube API's would allow one to implement the listing (https://developers.google.com/youtube/v3/docs/videos/listand it seems at a price). If anyone is aware of of a website already providing the service please let me know.Ideally I would like Youtube to make a proper filter for the channels. I don't think that is going to happen.Embarrassed Edit : Apparently there is a Search Function so the keyword issue is resolved. Still looking for a text listing without infinite scroll.
Ebay search -don't (just) use www.ebay.com! - Page 1
Forum section: electronics / general

author: splin
author_rank: Frequent Contributor
timestamp: May 06, 2020, 02:57:52 am
content: Ebay's website design is a mystery to me - in particular the differences between the different country websites and especially that some items can only be found if you search on a specific country's ebay site. Searching on ebay.com will usually, but not always, find most items.It may originally have been the intent to restrict search results to only display items that the sellor will ship to that same country, but that often isn't the case; for example, quite often items can be found on ebay.com, but not on ebay.co.uk, that can be shipped worldwide.But searching on ebay.com won't always find you everything. So here's a tip: search on ebay.co.uk (other country ebay sites probably work just as well), but select the 'worldwide' filter which isn't available on ebay.com. That will likely find most, but not all such items available worldwide; now edit the URL to change ebay.co.uk to ebay.com to find more items than would be shown by searching on either domain.For example I just tried searching for 'lpkf mill'.www.ebay.comfound 14 items; ebay.co.uk only found 3 items, but selecting the 'worldwide' filter gave 7 results. Editing the URL from ebay.co.uk to ebay.com gave 15 results. The extra result was from Latvia. Okay it's only one item but it may be just what you wanted - and possibly a great price because no-one in the US could find it!Another advantage of using the .co.uk -> .com trick is that on the UK site you can order results by price, as well as 'price + shipping'. The former isn't offered on the US site but it can be very useful for stuff that you might want to buy in quantity allowing you to amortise the shipping cost over many items.I'm sure there are many other ebay search idiosyncrasies that eevblog members have discovered so it would be great if you would share them here.What is going on with your websites Ebay? Why make it so dificult?

author: bdunham7
author_rank: Super Contributor
timestamp: May 06, 2020, 03:32:53 am
content: If you are really searching for something you should also type "thingI'mlookingfor ebay" into the Chrome search bar. I've located at least 5 things in the past few years that I just could not find any other way.

author: ChristofferB
author_rank: Frequent Contributor
timestamp: May 06, 2020, 06:59:10 am
content: Ive found quite a few hidden gems by using ebay.co.uk and ebay.de.I think if the item is set as not shipped internationally, it filters it out if you don't use the proper country's ebay, but usually, if they ship within their own country (in EU) they'll also ship to the rest of EU.Guessing what name equipment could be sold under in German is always fun

author: floobydust
author_rank: Super Contributor
timestamp: May 06, 2020, 07:07:09 am
content: This is also good for searching eBay:UKhttps://picclick.co.ukCanadahttps://picclick.caUSAhttps://picclick.com
Any suppliers for the uCurrent in Feb 2020? - Page 1
Forum section: electronics / general

author: bsodmike
author_rank: Regular Contributor
timestamp: February 26, 2020, 03:33:38 pm
content: Hi all,Any luck re. any suppliers for the above?Cheers M

author: james_s
author_rank: Super Contributor
timestamp: February 26, 2020, 04:18:38 pm
content: I ended up building one myself since they were out of stock at the time I went to order one. I still have a few extra blank pcbs, I got them in black solder mask with gold plated traces, looks pretty slick I think.

author: bsodmike
author_rank: Regular Contributor
timestamp: February 27, 2020, 09:33:26 am
content: Sweet, think I'll do the same heh!

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 27, 2020, 04:57:35 pm
content: Oh, yeah...https://www.eevblog.com/product/ucurrentgold/It's out of stock on EEVBLOG. I wonder if Dave intends to make some more or if he's going to stop it, and maybe ship a new version later on, or something...Last video I saw on this (dating a while back!!), he was still hand-testing all units, so that was probably time-consuming.

author: james_s
author_rank: Super Contributor
timestamp: February 27, 2020, 08:03:13 pm
content: I have a few extra bare boards I can offer at cost, I think it worked out to about $5 each, not gonna be worth shipping outside of the US. I don't want to compete with Dave, I only made my own because they were sold out.On a related note does anyone know of some good quality insulated binding posts that are a drop in snug fit in the PCB? I'm not fond of the bulky bare loudspeaker posts. If I were designing from scratch I think I'd have used banana jacks or flying leads with banana plugs for the output since I'm normally connecting straight to a multimeter.

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: February 27, 2020, 08:10:01 pm
content: Just to have mentioned this, there are also a few clones or even improved versions, e.g. theCurrent Ranger(bit on the expensive side though).I also saw clones with slightly different names on eBay for roughly the same price as the original but can't find any offers right now.

author: korlatos
author_rank: Regular Contributor
timestamp: February 28, 2020, 11:53:28 pm
content: James_s, PM sent regarding bare boards.

author: apoorv3in
author_rank: Contributor
timestamp: March 05, 2020, 09:46:46 am
content: I am working on multiple versions.I have created few pcs on original uCurrent available on Tindiehttps://www.tindie.com/products/Dothediy/ucurrent-precision-current-measurement/

author: Manoel
author_rank: Newbie
timestamp: April 30, 2020, 09:05:29 pm
content: Quote from: james_s on February 27, 2020, 08:03:13 pmHi James, sent you a PM regarding those boards.

author: james_s
author_rank: Super Contributor
timestamp: April 30, 2020, 11:29:38 pm
content: I guess I should update here too. I sold the extra boards I had some time ago so I no longer have extras. If someone else decides to have JLC make a batch then they'll likely be in the same situation I was and have a few extras.
Shockproof carry Bag for BM869s - Page 1
Forum section: electronics / general

author: BB3553AM
author_rank: Contributor
timestamp: April 30, 2020, 03:11:05 pm
content: Dear All,can someone recommend me a shockproof carry bag for my newly acquired brymen BM869s ?I'm not very convinced that the brymen one is best suited for travels.many thanks.
Tek Park - A Tour of Tektronix Beaverton Campus - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: April 26, 2020, 04:58:56 pm
content: Building of the Beaverton, Oregon campus - late 1960's

author: ivi_yak
author_rank: Regular Contributor
timestamp: April 30, 2020, 01:07:08 am
content: old but gold
Modeling a PNP circuit in LTspice, is this a short? - Page 1
Forum section: electronics / general

author: Yamin
author_rank: Frequent Contributor
timestamp: April 30, 2020, 11:26:06 pm
content: Hi guys,I was just messing about modeling a PNP circuit in LTspice. I made a mistake with the first circuit where I connected the second voltage supply directly to ground. I measured the current through the voltage source and the plot shows the result. Isn't the voltage source connected directly to ground? Shouldn't it show a dead short/infinite current draw?The correct circuit is on the right.Thanks in advance for the help.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: April 30, 2020, 11:50:34 pm
content: Hi,In this circuit the voltage across the 250 Ohm resister is12V + 5V - Vbe = 16.3The current is16.3V / 250= 65mAThis is very close to what LTspice is giving you.Regards,Jay_Diddy_B

author: Yamin
author_rank: Frequent Contributor
timestamp: May 01, 2020, 12:11:17 am
content: Quote from: Jay_Diddy_B on April 30, 2020, 11:50:34 pmThanks Jay,I'm sorry I am finding it a bit hard to follow your calculations. Are you doing it for the loop of the circuit on the right? Hope you would elaborate this for me.How is connecting the positive terminal directly to ground not shorting it?Thanks so much again.

author: langwadt
author_rank: Super Contributor
timestamp: May 01, 2020, 12:24:09 am
content: Quote from: Yamin on May 01, 2020, 12:11:17 amto get a short you need to connect both terminals to the same thing, you have one side to ground the other to a resistoryou can flip it around and set the voltage to -5V it is the same

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 01, 2020, 12:27:51 am
content: Maybe this will help:There is 17V between A and BThere is 17V - VBe = 16.3 between C and BDoes that help?Jay_Diddy_B

author: Yamin
author_rank: Frequent Contributor
timestamp: May 01, 2020, 09:49:18 am
content: Thanks so much it really helps, really do appreciate it
Built down to a price - Page 1
Forum section: electronics / general

author: lmester
author_rank: Regular Contributor
timestamp: April 27, 2020, 06:11:29 am
content: I needed to add a second network card to a PC so I can use it as a router. The only NIC's that I had on hand have a full height mounting bracket. This PC uses small form factor cards.I removed the full height bracket and cut it down to fit. There were no screws attaching it to the PCB. Just tabs on the bracket bent into the PCB holes! How much do two machine screws cost? This really showed me how much work is done to reduce materials cost! Possibly assembly costs. Is it cheaper or faster to bend over two tabs than to screw in two machine screws.I'd be interested in hearing from anyone who deals with design decisions like this.
Erasing Flash Memory - Page 1
Forum section: electronics / general

author: mbarszcz
author_rank: Contributor
timestamp: April 25, 2020, 09:43:32 pm
content: As we know, the default state of erasable memory (EPROMs, NAND flash, etc) is 0xFF, but are those values what is actually exposed to the PC/device in the case of SD or CF cards? When a PC writes a file full of zeroes, is that actually writing 0x00 to the flash memory, or is it writing 0xFF?If you were to look at a brand new SD card with a hex editor on a PC, would it be full of 0x00 or 0xFF?

author: ataradov
author_rank: Super Contributor
timestamp: April 25, 2020, 09:54:10 pm
content: SD Cards are typically sold pre-formatted, so they could contain anything.SD Card specification actually defines a bit in the status registers that tells the host the values after executing the erase command. So it is up to the card vendor to decide what they want to show as a "erased" state.Specifically section 4.3.5.1 "Erase" of the "Physical Layer Simplified Specification" (https://www.sdcard.org/downloads/pls/index.html) says this:Quote

author: Peabody
author_rank: Super Contributor
timestamp: April 25, 2020, 10:53:49 pm
content: As Alex says, the erased state depends on the manufacturer. I suspect the actual erased state is always FF, but some manufacturers could have an inverter stuck in there.The much-hailed SD Formatter app provided by the SD Association offers an "Overwrite" option, which I've confirmed does actually write zeroes to the entire card instead of erasing it. They don't offer an Erase option, at least not on the Windows version.If you have a DSLR or other fancy camera that offers a "low level" format, that will erase the card, and then you can look at it in your hex editor and see how it reads back. In the Arduino world there is a library called SdFat which includes an Example called SdFormatter.ino. That sketch does erase the card, and tells you what Alex's bit 55 says.

author: mbarszcz
author_rank: Contributor
timestamp: April 26, 2020, 08:22:58 pm
content: Thanks for the information. Interesting that it can vary by manufacturer. I just got a new SanDisk Extreme MicroSD card today, and it was filled with zeros.
Electronics Australia archive, April 1939 reprint - Page 1
Forum section: electronics / general

author: bluey
author_rank: Regular Contributor
timestamp: April 25, 2020, 07:33:37 pm
content: Lots of old issues of Electronics Australia at archive.org, looks like they are organised by year "Electronics Australia 19nn".Electronics Australia April 1989 has some interesting history.50 year anniversary issue has reprint of the April 1939 edition. Page 80 has an article on the next 50 years.https://archive.org/stream/EA1989/EA%201989-04%20April#page/n81/mode/2up

author: RoGeorge
author_rank: Super Contributor
timestamp: April 25, 2020, 07:52:58 pm
content: Added to themagazines and journals collection topic, thank you.
Reed switches chirping - Page 1
Forum section: electronics / general

author: Ice-Tea
author_rank: Super Contributor
timestamp: April 24, 2020, 12:56:59 pm
content: Hello folks,I have had two pieces of gear, vastly different ones, "chirp" on me recently. Both times, I think, it were Reed switches. I've been browing around a bit and can't seem to find much info on this. What are your experiences? And is this "yeah, that's just the way Reed relays roll" or is this "That one is almost gone"? As far as I can tell, no functionality is impacted...Thoughts?

author: WattsThat
author_rank: Frequent Contributor
timestamp: April 24, 2020, 02:47:00 pm
content: I dunno. Could just be what it does?I’ve worked with several reed relay based devices over the years, kind of got used to the call of the crickets. The best was a Julie Research Labs digital meter, circa 1975, were the kelvin varley divider was automated with reed relays. When you made a measurement and the bridge would null, the reed relays sounded like the hottest summer night you’ve ever heard. It was nice because you never looked at the Numitron display until the crickets were quiet. Only then was the measurement stable.

author: Ice-Tea
author_rank: Super Contributor
timestamp: April 25, 2020, 05:35:20 pm
content: The odd thing is there is so little info to be found about it? It seems to be in the DNA of some people "in the know", but I can't seem to find anything concrete. Like app notes, mentions in the datasheet or what not.And I could live with it during warmup, but it raises an eyebrow or two when it does it during normal operation..

author: jmelson
author_rank: Super Contributor
timestamp: April 25, 2020, 07:41:31 pm
content: I got a tour of a Bell System #3 ESS many years ago. All the switching was done with "ferreeds", kind of a combination of magnetic core memory and reed switches, so the ferrites stored the field that latched the reed contacts. It had tens of thousands of them. It made a marvelous sound with all those contacts opening and closing rapidly. When the contacts close, there is a slight vibration when the energy of the moving armature is transferred to the contact. And, when the contacts open, there is a different frequency as the armature pulls away and then vibrates like half a tuning fork. At least, that's what I think causes the sounds.Jon
Automatic component life-cycle tracking - Page 1
Forum section: electronics / general

author: Poe
author_rank: Frequent Contributor
timestamp: April 24, 2020, 02:08:22 am
content: We have a large database of parts and our old manual system of email notifications from distributors and manufacturers is not working.We're looking for anything that will help us automatically track the life-cycle of each component.Any names of products/services, or what to Google, or your experience with such services ..would be greatly appreciated.Also, any chance our Altium subscription be leveraged in any way?

author: Poe
author_rank: Frequent Contributor
timestamp: April 24, 2020, 03:59:29 pm
content: For anyone in a similar boat, we're looking into services like ArasPLM and Silicon Expert right now.They look quite expensive.Our next step might involve trying to tie into Octopart's API to search for lifecycle status of each component in our database.
ACF Bonding - Melbourne - Page 1
Forum section: electronics / general

author: super_postie
author_rank: Newbie
timestamp: March 31, 2020, 10:27:18 am
content: HiI have an small monochrome LCD where I suspect the ACF bonding has begun to fail. This is because there are problems with vertical pixel rows, suggesting parts of the matrix circuitry has poor connection rather than the liquid itself or polarisers are bad. With freeze spray, the panel comes back to near perfect. Freeze spraying the driver chip has no effect.Is there anywhere in Melbourne that can dissolve and rework ACF bonding? Flex to glass. Would love to do it myself, but it is hard to see how this is possible without proper equipment.It is a probably a bit of a punt, but new panels are not available.

author: Till Matte
author_rank: Contributor
timestamp: April 24, 2020, 03:30:28 am
content: If it is ACF connection problem, when you press on the flex cable or ACF connection area, the lcd display would be recovered.From the picture, it is COF IC on the flex cable, it seems it is acustom lcd, i think the problem might be comes from the flex cable and the IC driver connection, not from the ACF connection. because the pins are easily broken on the flex cable on the IC driver's pin. if it is, it would be hard to repair.