hybridfree/eevblog-posts huggingface dataset:
An absolutely superb electronics fundamentals course  - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: October 13, 2020, 12:20:25 am
content: With the advent of YouTube, finding a reliable source of **high quality** tutorials on engineering topics, is quite a minefield.Let's face it, with YouTube you're relying on the channel author saying he's an "expert", and potentially you're wasting maybe many hours listening to his "tutorials", only to find out he's made many errors, speaks WAY too fast, and... well, maybe he's just not very good at articulating and teaching the subject.Yes, there's plenty of superb YouTube speakers, but allow me to send you down a different track... I've signed up for "The Great Courses Plus" trial, and oh boy are the lecturers ever top notch! The specific course I'm following is hosted by Dr. Richard Wolfson, and is just so well presented and explained, a step or ten above what I'm used to seeing (ithese are n the ballpark of "Mr Carlson's Lab" territory, whom I'm convinced would also make a great asset to their company!)https://www.thegreatcoursesplus.com/understanding-modern-electronicsIf you are looking for a solid grounding in the fundamentals of electronics engineering, look no further, seriously. The company sends out scouts to sit in on their lectures wherever they may currently work, and observe their style, etc (https://en.m.wikipedia.org/wiki/The_Great_Courses)I can't recommend this company highly enough.
how to know the type of linearity ?  - Page 1
Forum section: electronics / general

author: harrysmith
author_rank: Contributor
timestamp: October 07, 2020, 09:26:08 pm
content: Hello everyone.is there a method to follow to know that a system is linear or non-linear in electronic field of sensors ?

author: indeterminatus
author_rank: Contributor
timestamp: October 07, 2020, 10:32:34 pm
content: Note that I am a beginner myself.My understanding is: a system is only linear if all of its components (at least on a very abstract, lumped component level) are linear. It becomes non-linear once you introduce a non-linear component.Not sure I understand your question. Could you be more precise?

author: harrysmith
author_rank: Contributor
timestamp: October 08, 2020, 02:02:25 am
content: precisely on a datasheet of a BPW41N photodiode sensor. or I can know its linearity. do we observe these graph characteristic of the datasheet. if so how ?https://pdf1.alldatasheet.com/datasheet-pdf/view/26252/VISHAY/BPW41N.html

author: ChristofferB
author_rank: Frequent Contributor
timestamp: October 08, 2020, 06:24:18 am
content: I think you're mixing two concepts: a circuit component or circuit can be linear or nonlinear (based on C-V response I believe)https://en.m.wikipedia.org/wiki/Linear_circuitThe linearity of a sensor is a completely separate physical quality, as a photodiode by the above definition is a nonlinear component, its light intensity to current conversion can be linear within a range.I guess youd have to compare its output against a calibrated variable intensity light source.

author: Simon
author_rank: Unknown
timestamp: October 08, 2020, 06:58:02 am
content: https://www.eevblog.com/forum/beginners/linearity-of-an-electronic-system/msg3267336/#msg3267336
BPW41N it is a linear sensor ? - Page 1
Forum section: electronics / general

author: harrysmith
author_rank: Contributor
timestamp: September 24, 2020, 03:18:44 pm
content: hello community. I hope you are wellI would like to know is that the BPW41N sensor is a linear or non-linear sensor with justification. thanks

author: SeanB
author_rank: Super Contributor
timestamp: September 24, 2020, 04:18:20 pm
content: Quite linear if used in a current source mode into a virtual ground at an opamp input, and,like any photodiode, not linear in voltage source mode, though running it with a bias voltage probably will be reasonably linear.Datasheet here,https://www.vishay.com/docs/81522/bpw41n.pdfso yes it is reasonably linear within a range, though low light and bright light levels is going to make it non linear at the high end, and noisy at the low end.

author: Halcyon
author_rank: Unknown
timestamp: October 08, 2020, 09:43:34 am
content: Please stop posting the same questions in individual threads. Use the existing thread you have. You are on notice.
AMD Is in Advanced Talks to Buy Xilinx - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: October 09, 2020, 07:34:52 am
content: "Deal that could be worth more than $30 billion would mark the latest big tie-up in the rapidly consolidating industry"https://www.wsj.com/articles/amd-is-in-advanced-talks-to-buy-xilinx-11602205553

author: AndyC_772
author_rank: Super Contributor
timestamp: October 09, 2020, 08:14:23 am
content: Probably the single most predictable deal in the history of the semiconductor industry, after Intel bought Altera.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: October 09, 2020, 08:24:28 am
content: Assuming the deal is successful, what is the chance of AMD putting out the bin fire that FPGA tooling is?

author: daqq
author_rank: Super Contributor
timestamp: October 09, 2020, 09:11:31 am
content: Meanwhile IBM is splitting:https://arstechnica.com/information-technology/2020/10/ibm-to-split-into-two-companies-by-the-end-of-2021/

author: ataradov
author_rank: Super Contributor
timestamp: October 09, 2020, 04:07:29 pm
content: Quote from: AntiProtonBoy on October 09, 2020, 08:24:28 amAlmost none.Although I must say Intel acquiring Altera was not that bad. I don't think they make anything much worse, and some things improved.AMD seems like a decent company, I doubt they will do anything drastic.

author: bap2703
author_rank: Regular Contributor
timestamp: October 10, 2020, 08:14:41 am
content: Quote from: ataradov on October 09, 2020, 04:07:29 pmMaybe it's more about Intel doing bad things to them?
Video: Slim Wallet Made From Recycled Windshields - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: October 07, 2020, 11:45:14 am
content: interested what you guys think about this.

author: jogri
author_rank: Frequent Contributor
timestamp: October 07, 2020, 01:35:29 pm
content: Sounds like a really stupid idea...First, you have to extract the PVB film from the windshield (probably by heating and dissolving it), then you have to purify it because it is going to end up in a product that experiences a lot of skin contact->not great if it contains toxic additives. It looks like they use the PVB as a base layer and just add another type of plastic like polyurethane or PVC as a coating... They could have used cotton as a base layer (and i bet that this would be more energy efficient), but that would yield a "normal" form of artifical leather that isn't distinguished enough for hipsters to use. So they take a lot of energy to separate and clean a plastic that was never intended to be used as a fabric, cover it with another layer of plastic and claim that it is a great product because it contains "recycled" materials. Yeah.Edit: Who thought that a tracker that spends 99.9% of its time in absolute darkness should be powered via a solar panel? Yes, it is definitely convenient to place your tracker OUTSIDE your wallet for hours to charge it up so that you can find your wallet. They claim that a 3h charge lasts for 2-3 months, thats long enough to not remember that you have to charge it but short enough to be a PITA when you need it and are under the impression that it is still charged. Also: Bluetooth for tracking. Works like a charm when you know that it should be in a specific room or car but really want to search everything because it can't give you a precise location.
Ebay item paid for but not collected: what to do about it? - Page 1
Forum section: electronics / general

author: tggzzz
author_rank: Super Contributor
timestamp: October 07, 2020, 06:57:49 am
content: I sold an item on fleabay and the purchaser paid promptly. The purchases seems reasonable, but we have been unable to arrange a date for collection. I doubt that the purchaser will collect within a reasonable time, so I'd like to find a way of selling the item to someone else.So, what's the best way to proceed?Objectives: we all get all our money back, and neither of our reputations are damaged?

author: tom66
author_rank: Super Contributor
timestamp: October 07, 2020, 07:18:36 am
content: Contact the buyer with an ultimatum:"Please arrange to collect your item within 14 days or it will become necessary to charge you storage fees of £10 per day thereafter. Should you no longer wish to purchase the item, please notify me before this date so that a full refund can be arranged and the item can be resold to another interested buyer."

author: magic
author_rank: Super Contributor
timestamp: October 07, 2020, 07:23:11 am
content: Check the TOS or ask a lawyer. I can't believe that you are the first having such problem or that you have an obligation to store the item indefinitely.Then inform the buyer what's going to happen if he doesn't show up.

author: greenpossum
author_rank: Frequent Contributor
timestamp: October 07, 2020, 07:41:15 am
content: Have you looked at the eBay forums? Here's one that suggests initiating a cancellation request. In any case you should ask eBay.https://community.ebay.co.uk/t5/Archive-Seller-Central/Buyer-has-paid-but-not-collected-what-can-yo-do/td-p/2836837

author: Halcyon
author_rank: Unknown
timestamp: October 07, 2020, 08:17:52 am
content: Just open up a case with ebay. They will refund the payment and allow you to re-list the item. Similar when someone just refuses to pay.
preserve store electronics devices and dvd discs - Page 1
Forum section: electronics / general

author: micksmelanie
author_rank: Regular Contributor
timestamp: June 27, 2020, 09:41:17 pm
content: How to properly conserve electronic devices and DVD discs to preserve them in the long term storage keep them well maintained

author: Bassman59
author_rank: Super Contributor
timestamp: June 27, 2020, 09:48:09 pm
content: Quote from: micksmelanie on June 27, 2020, 09:41:17 pmEncase them in amber.

author: David Hess
author_rank: Super Contributor
timestamp: June 27, 2020, 11:53:25 pm
content: Store in a cool and dry place.

author: Halcyon
author_rank: Unknown
timestamp: June 28, 2020, 02:01:08 am
content: Burnt optical media isn't designed for long term storage (CD's, DVD's and Blurays) aren't designed for long term storage. Even the high quality discs don't last very long. In my experience, within about 10 years, even if you store them in an air-conditioned environment, disc rot starts to set in. We have archives at work going back to about 2006-2008 which are completely unreadable.You can get "archival quality" discs, but be prepared to pay through the nose for them.

author: james_s
author_rank: Super Contributor
timestamp: June 28, 2020, 02:59:24 am
content: I have some CD-Rs from nearly 20 years ago that are still fine although I've had some others fail.For storing electronics remove the batteries and store them in a cool dry location. For data the most foolproof solution is to have multiple copies and copy the data to new media every 5-10 years, storing it in a cool, dry and dark location.

author: micksmelanie
author_rank: Regular Contributor
timestamp: June 28, 2020, 10:49:32 am
content: I DVD-R discs Verbatim AZO and MDisc DVD Verbatimabout preserve long term storage i have snes video game, crt tv, portable console with lcd screen, BP-5L battery, internal microSD card, video game cartridges in an open anti-static bag for greater air circulation and this bag inside a shoe box place of my home is the most recommended for long-term storage?

author: David Hess
author_rank: Super Contributor
timestamp: June 28, 2020, 04:01:31 pm
content: Except for CD and DVD discs which were of questionable quality when purchased, I have had no bit rot problems going on 20 years.If you are serious about long term storage, then inorganic M-DISC media is available now which should have a very long archival life:https://en.wikipedia.org/wiki/M-DISC

author: bobcat2000
author_rank: Regular Contributor
timestamp: October 07, 2020, 07:12:32 am
content: M-Disc went under 4 years ago. However, I see Verbatim and LG are still selling the M-Disc products. Did Verbatim and LG took over the join? I do want to buy some M-Disc to back up my files if the product is still supported.
GPP 4323 GW-Instek display bad noise - Page 1
Forum section: electronics / general

author: Jan Audio
author_rank: Frequent Contributor
timestamp: October 06, 2020, 02:48:57 pm
content: Hi, i have a question for owners of the GW-Instek GPP 4323 PSU.Here is a video i made :https://youtu.be/oj_BJjIedLADo you also have this noise when setting the low and especially middle value for the display ?thanks

author: Jan Audio
author_rank: Frequent Contributor
timestamp: October 06, 2020, 02:57:20 pm
content: Sorry wrong category, can you please place into test-equipment ?
Schottky Barrier Rectifier  ! - Page 1
Forum section: electronics / general

author: spike47
author_rank: Contributor
timestamp: October 05, 2020, 02:13:03 pm
content: HiI am wanting to replace a couple of "SR2A0 Schottky Barrier Rectifiers 2A" finding it difficult to find ! , is there a different one that will match this ?.cheersSpike

author: TimFox
author_rank: Super Contributor
timestamp: October 05, 2020, 03:29:53 pm
content: A quick check of Mouser shows 4 leaded parts rated at 100 V, 2 A, that are in stock. Where did you look?https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Diodes-Rectifiers/Schottky-Diodes-Rectifiers/_/N-ax1mjZ1yzvvqx?P=1z0y466Z1yuk7vzZ1z0z63xZ1yuoc6wZ1yuoc5p

author: spike47
author_rank: Contributor
timestamp: October 05, 2020, 04:11:24 pm
content: Thanks for that, I normally purchase from a couple of ebay companies that I have used quite a lot, but they don't seem to stock this particular one ! .cheersSpike
OSHWA board nominations, can reputable people from EEV forum apply? - Page 1
Forum section: electronics / general

author: nuclearcat
author_rank: Unknown
timestamp: October 05, 2020, 03:27:33 pm
content: https://www.oshwa.org/2020/09/30/oshwa-2020-2022-board-nominations-open/And please, people, do it, to put common sense into them and stop wasting other people time by renaming MISO/MOSI to various nonsense due "inclusivity".
From the wonderful world of long-forgotten technologies: the Radiovoter systems  - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: October 04, 2020, 10:58:21 pm
content: One thing I really enjoy is learning about technologies of the past, electronic and otherwise, that never quite took off (at least in their time) for whatever reason - impracticality, lack of public/investor interest, high cost, safety problems, etc. The June 1934 issue of Popular Science magazine contains two great examples, both from the same inventor.https://books.google.com/books?id=wSgDAAAAMBAJ&lpg=PA37&dq=radiovoter%20system&pg=PA36#v=onepage&q=radiovoter%20system&f=falseThe first, "Voting By Radio", describes a fascinating brute-force concept for achieving one of mankind's oldest and most elusive dreams - communication over power lines - for the purpose of recording audience response by radio broadcast listeners.The second, "Radiovoter Gives Audience a Chance to Register Likes and Dislikes While Entertainment Goes On", discusses an RF system for recording responses from theater audiences - remarkably similar to the classroom "clicker" systems in use today.
Identify the subject of this photo :) - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: October 06, 2020, 03:19:40 am
content: A quick bit of fun - identify the subject...

author: ChristofferB
author_rank: Frequent Contributor
timestamp: October 06, 2020, 07:30:05 am
content: Fabry-Perot interferometry? Not quite but each half looks the part

author: eti
author_rank: Super Contributor
timestamp: October 06, 2020, 07:48:28 am
content: Quote from: ChristofferB on October 06, 2020, 07:30:05 amNope.Answer: What you're seeing is the two fresnel lenses of the flashlight which disperse and focus the dual colours of the two flashlight LEDs (they have two colours so software can adapt the camera flash colour temperature for different lighting conditions) on my Moto G7 Plus phone. The LEDs shine through these two tiny lenses, and I fired them into an old cine projector lens group (a stack of lenses designed to project cine film onto a screen), onto the wall.https://en.m.wikipedia.org/wiki/Fresnel_lens
"Australian Post Office Technical Training Publications" - any historical value? - Page 1
Forum section: electronics / general

author: Whales
author_rank: Super Contributor
timestamp: October 04, 2020, 02:05:18 am
content: I have a stack of dozens of these things, but I want to clean out. Don't remember where I picked them up. Mixture of electronic & telecomm materials, summaries & questions.Are these of any particular historical value? At the moment I'm planning on just keeping a few of interest ('practical transistor amplifiers', 'cathode ray oscilloscope principles', 'transistor oscillator principles', 'circuit reading - telephone 801 type') and canning the rest.

author: sandalcandal
author_rank: Unknown
timestamp: October 04, 2020, 02:58:55 am
content: Looks pretty nice. I have some old Australian electronics textbooks and I always found them to be much better written and more understandable than the modern American textbooks recommended at uni.I found some scans from the same series here:http://www.coxhill.com/trlhistory/history/australian_publications.htmThey seem to be missing some of the ones you have so might be worth getting some scans uploaded onto the net and shared with Rick who runs that site, if you got the time.
Getting tech support as private individual - Page 1
Forum section: electronics / general

author: Zeyneb
author_rank: Regular Contributor
timestamp: October 02, 2020, 09:11:26 pm
content: Hi there,Today I sent an email to Vishay technical support to get some more info on what is in their datasheet.I honestly told them I'm a private individual. You know, not much revenue prospect from my side. And this always worries me if they are willing to spend any time on this.How do you experience technical support from major component manufacturers for you being a private individual? Also some companies also have forums to benefit other customers.In talking about:TI, Analog Devices, Maxim, Vishay, TE/AMP, NXP, ON semi, Taiyo Yuden, etcetera.Or you pretend being from some unknown startup company. Something I don't feel comfortable with.

author: ataradov
author_rank: Super Contributor
timestamp: October 02, 2020, 09:41:30 pm
content: There is no point in pretending to be bigger than you are. There are typically two ways to get support:1. General support channel. This will get you to some L1 support team, and at that level everyone is basically equal.2. Though an FAE. If you are an actual company/startup with some verified revenue potential, then you are likely will have an FAE that can answer questions in a more direct way or submit L2 tickets, which have a better chance to be answered.So just going though L1 case and providing as much technical information about your issue or question in a first request is the best thing to do. If the person looking at the ticket does not have to pull information from you, your chances to get a response become much higher.

author: tkamiya
author_rank: Super Contributor
timestamp: October 04, 2020, 12:23:23 am
content: If you are a big enough company with big enough volume, you'll have an account and a representative who will do some of the support stuff/triage on your behalf. Lacking that, tech support won't usually treat you any differently. No, I never pretend to be a big user/company. I always say I'm a hobbyist looking for information.I did support for large and medium company for decades. Calling as a customer, I haven't seen anything differently. We had customers claiming dollar values and such. It didn't make any difference as a tech support rep. A call is a call is a call.
Circuit Simulation File - Page 1
Forum section: electronics / general

author: Cujo
author_rank: Regular Contributor
timestamp: October 03, 2020, 06:50:29 am
content: I have received a complicated logic circuit that was built in this simulator (.dig) file.https://github.com/hneemann/DigitalI mainly use this simulator for logic circuit stuff (.circ) file.http://www.cburch.com/logisim/Is there any way to convert the (.dig) into a (.circ) file, so it can be used in Logisim?

author: GlennSprigg
author_rank: Super Contributor
timestamp: October 03, 2020, 01:01:36 pm
content: I doubt it. Within the first link you gave...https://github.com/hneemann/DigitalIf you keep scrolling down that page, there is quite detailed dialog about the discontinuation ofLogisim, under theheading of 'Motivation'. Maybe you should change over & try using that updated and more powerful software of theirs?
Hi, new user here :-)  - Page 1
Forum section: electronics / general

author: rog77
author_rank: Newbie
timestamp: September 30, 2020, 12:56:38 pm
content: I thought I would stop by and say hello before I start asking my inane questions...My background is in IT/Networks, with a smattering of scripting.I've been acquiring bits of electronic parts for a short while, but never found the time to get into it properly, but now for obvious reasons I seem to spend a lot more time in the house, and feel that trying to upskill would be a better use of my time than netflix.I am interested in learning about MCU, FPGA and embedded programming.My ambition is to one day build a cheap open source device that has some utility that a few people might actually buy, not because I think it will make me rich, rather if someone parts with cash it means to me that they felt the idea had merit.It looks like you have a great forum here, and I hope to get involved once I have something useful to contribute.Wish me luck!Thanks for reading.

author: Unknown
author_rank: Unknown
timestamp: September 30, 2020, 04:15:49 pm
content: Quote from: rog77 on September 30, 2020, 12:56:38 pmHello. Best ideas are the ones where you have an issue and create something to get round that.My amazing idea in the 80s was as a kid "That bag outside slides nice on the snow. Maybe you could put a board or something similar down. Hold it with string and slide. Like the board of a skateboard".I'd invented the snowboard. Unfortunately I didn't realise it already existed

author: rog77
author_rank: Newbie
timestamp: September 30, 2020, 04:34:13 pm
content: Thanks for the advice :-)What I would like to work on is dirt cheap, but useful, terminals, that aren't Raspberry Pi's.Yesterday was day one, and so far it's not exactly off to a flying start... Trying to get HDMI out of a Gowin FPGA, but I suspect my messy breadboard wiring isn't helping. Once I have had another go, I will start a thread with photos and screenshots asking for advice.I suspect my other half is bored of me holding things up and comparing them to the computers used to put people on the moon, or what I had on my desk in the 90's... Hence my being here hoping to find interesting folk to talk to.I am looking for advice, but not for someone to do all the work for me, where would be the fun in that?

author: MosherIV
author_rank: Super Contributor
timestamp: October 02, 2020, 05:45:39 pm
content: HiWelcome to the forum.If you want to get into microcontrollers and embedded programming, I recommend you start with Arduino.They are ready built micro controller baords. Very simple to start with and easy. Lots of examples out there.Once you get the hang of using the built in libraries, start to write your own library function.Your goal is to get to the point where you write your own driver for the peripherals eg the ADC.Once you can write peripheral drivers, you are ready to graduate to 32bit micros like ARM Cortec M. The STM32 are pretty cheap for dev boards.
Beep, beep, beep, beep, hello there! - Page 1
Forum section: electronics / general

author: Canis Dirus Leidy
author_rank: Regular Contributor
timestamp: October 04, 2020, 02:05:15 pm
content: In preparation for the launch of an artificial satellite, a series of articles was published in the Radio magazine in the summer of 1957. If in the June [ Specified attachment is not available ] issue there was a pure theory (the basics of orbital dynamics, radio wave propagation and the influence of the satellite's own motions on the radio signal), then in the next two there were practical recommendations:Guide to building a VHF(sic) receiver for tracking Sputnik radio signals at 20 and 40 MHz.Direction finding add-on. It used the equisignal-zone method: the moment when the satellite crossed the meridian was recorded when the beat of the signal from two directional antennas (switched at frequency of about 300 hertz) became (by ear) equal to zero.A short extract from the Western press about Vanguard and Minitrack receivers, plus a message from the Academy of Sciences (how to correctly write reports about received Sputnik signals).Description of the observation technique with a receiver and direction finding add-on, based on the results of field tests (an airplane was used as a signal source).P.S. I don't think my translation will be much better than Google Translate, so here are the OCRed and spellchecked (I hope) texts of the articles.
Is this an op amp? (educated eyes needed) - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 30, 2020, 10:48:00 pm
content: Is the part I have, a 4558 op amp? I'm hoping so - I've just spent 1hr soldering itSame as this, except SMD?https://www.amplifiedparts.com/products/op-amp-4558-dual-8-pin-dipThanks.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: September 30, 2020, 11:54:47 pm
content: Probably a variant of 4558 from another manufacturer, so my guess is yuppohttps://www.ti.com/lit/ds/symlink/rc4558.pdf

author: eti
author_rank: Super Contributor
timestamp: October 01, 2020, 12:11:15 am
content: Quote from: ANTALIFE on September 30, 2020, 11:54:47 pmBRILLO! thankso!
What professional magazines do you read? - Page 1
Forum section: electronics / general

author: PartialDischarge
author_rank: Super Contributor
timestamp: September 20, 2020, 07:20:07 am
content: I'm not talking about electronics as a hobby, but magazines that focus on particular applications/technologies.

author: NSCI0T7
author_rank: Newbie
timestamp: October 04, 2020, 02:50:03 am
content: I used to read Compound Semiconductor when I was in my masters. I used to read Microwave Journal when I was in an RF job.
Anyone recognise this app note excerpt? - Page 1
Forum section: electronics / general

author: David Aurora
author_rank: Frequent Contributor
timestamp: October 01, 2020, 05:12:19 am
content: http://images.china-pub.com/ebook1115001-1120000/1118328/ch02.pdf(English language starts on page two, don't panic)I know I've come across it before but I can't seem to find the source now. I've tried searching a few headings and sentences and found nothing. I feel like it's a TI thing?

author: JackJones
author_rank: Regular Contributor
timestamp: October 01, 2020, 05:28:27 am
content: I googled a sentence and came up with this - Design with Operational Amplifiers and Analog Integrated Circuits - Sergio Franco.ISBN 9780078028168

author: greenpossum
author_rank: Frequent Contributor
timestamp: October 01, 2020, 05:28:55 am
content: Looks more like a chapter excerpt from a textbook with the exercises.Haha, beaten to it but confirmed.

author: David Aurora
author_rank: Frequent Contributor
timestamp: October 02, 2020, 12:27:30 am
content: Quote from: JackJones on October 01, 2020, 05:28:27 amBingo, thanks! I searched a bunch of sentences unsuccessfully, looks like I gave up too easily!
Where to buy direct bury fiber optics cable in the US? - Page 1
Forum section: electronics / general

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: September 29, 2020, 05:24:03 pm
content: Does anyone has recommendation on where to shop pre-terminated direct bury fiber optics cable in the US at a fair price? I am trying to get 500ft of 6-strand OM3 cable.Thanks.
Zeptobars could use some metal-packaged IC's for die shots - Page 1
Forum section: electronics / general

author: floobydust
author_rank: Super Contributor
timestamp: September 29, 2020, 10:50:32 pm
content: He rush relocated (COVID travel related) from Moscow to Switzerland(more in his blog)but the plastic decapsulation gear did not travel"[...] I will be slowly recovering decapsulation & imaging capabilities at Zeptolab-3 in Zürich by the end of this year, hopefully including laser decapsulation.Meanwhile, if you have some assortment of ICs in metal cases and could send them to me - it could help to close the gap and keep the blog alive.You can send a short note, your name/link to refer to in the article and ICs to:Mikhail Svarycheuski...Switzerland"
345 kV substation walkthrough - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 28, 2020, 03:56:23 am
content: Interesting random you tube find.For pandemic watching.

author: Larryc001
author_rank: Regular Contributor
timestamp: September 29, 2020, 01:09:11 am
content: Gosh that is amazing. And we think our equipment has high voltages. Wow. I am surprised he could go inside there without getting zapped. I wonder if it is that safe when operating?

author: eti
author_rank: Super Contributor
timestamp: September 29, 2020, 02:00:47 am
content: Shockingly good, thanks.Ever since I was a child, the sight of these places and the knowing of what's inside and how lethal it is, and that it could JUMP!!! out and kill you in a millisecond, together with not knowing where's safe to walk and where isn't, gives me a very healthy reverential fear of them, ensuring you'd NEVER catch me inside the fence of one. It's like a sense of impending dread and reverential fear, if that makes sense?Interesting, but no thanks!!

author: peter-h
author_rank: Super Contributor
timestamp: September 29, 2020, 09:11:32 am
content: I used to work in high voltage. 345kV will jump about 1ft. t depends on the geometry; a sharp spike will make a greater distance. But there is no danger walking about underneath like the guy is doing.Funny thing is that you can have a 2" diameter insulated cable carrying 440kV RMS. I see that not far from where I live, where the overhead line goes underground, briefly.Great video
Fridge/Freezer issue (old model - prob 1990s) - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 28, 2020, 09:26:00 pm
content: : ## A family member said to me "oh that fridge was always overly cold in the fridge compartment!"I came down today to find the food in the freezer section of my fridge/freezer combo (90s model I'd think)was all going very soft (not dripping or totally soft) - BUT was still reasonably cold - much of it semi-frozen-ish. The fridge compartment food (no meat, I am a vegetarian) seemed cold enough (milk, cheese, olives)~~ Thefridgecompartment had a sheet of ice on the back inside wall, which fell off when I removed the shelves.~~ I have now emptied freezer and put a bowl of boiling water in, and towels surrounding it, to defrost# I am new to the defrosting a freezer game - am I right in thinking that the sheet of ice on the back wall of the inside of the fridge (clearly shouldn't be there) was "telling" the thermostat not to turn on the compressor, therefore I had a freezer defrosting situation?# Also, is the white disc with the screw in the centre, right-hand side of one of the images, the thermostat sensor?I know this sounds obvious, but I am not sure.. help! thank you

author: The Soulman
author_rank: Super Contributor
timestamp: September 28, 2020, 11:00:02 pm
content: Yeah, don't let ice buildup to much, defrost regularly and make sure the door seals properly.Otherwise should be fine.

author: eti
author_rank: Super Contributor
timestamp: September 28, 2020, 11:18:55 pm
content: Quote from: The Soulman on September 28, 2020, 11:00:02 pmThank you ever so muchSo am I right in following the thought train that the ice sheet on the back wall of the fridge (upper compartment) was keeping the compressor from kicking in, due to it "thinking" it was cold enough?

author: aqarwaen
author_rank: Regular Contributor
timestamp: September 28, 2020, 11:37:53 pm
content: are you really not worried using 30 years old fridge?if rember correctly it set apartment building in England to fire..u should check electronics and atleast clean it from dust.

author: Peabody
author_rank: Super Contributor
timestamp: September 29, 2020, 03:20:24 am
content: You should not be having sheets of ice build up. My refrigerator is a 1979 Whirlpool, and it defrosts automatically three times a day. Maybe the defrost timer on yours isn't working (never worked?).

author: bdunham7
author_rank: Super Contributor
timestamp: September 29, 2020, 04:01:02 am
content: That disc looks like the thermostat. If it was covered with ice, it would be insulated from the air and would not respond correctly.
Nostalgic look at a famous WW2 portable radio !! - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: September 30, 2020, 11:30:24 am
content: I've been watching all the old B&W episodes of the WW2 TV show "Combat!" filmed in the 1960's, on YouTube.Most of us have seen, in such old shows/movies, the hand-held 'portable' Walkie-Talkies' they always used back then...Back then, they weren't called that though, and were first referred to as "Handie-Talkies". First, here's a picture of one.This model was called a 'BC-611', and alternatively a model 'SCR-536', initially made by Motorola.They contained5valves/tubes, and the internal construction was very neat and modular. They had 2 sets of batteries, oneset being1.5 Vfor the directly heated tube filaments, and the other set for approx100-Vfor the plates etc. Depending on theterrain etc., they were good for a range of about 1 to 3 miles in general. Their output power was only360 Milli-Wattsthough!!Some interesting points...Firstly, in the photo above, the aerial looks like a HF snub, but that's just an unscrewable 'cover', for a 3-foot telescopic aerial.They were A.M. radios, that could be used on between about 3 to 8 MegHz, and came with boxes of alternative Chrystal's & inductors,to interchange with, giving you about 50 variations of frequencies in the 80-Meter band.The aerial, being so short, and no real 'ground' ref, their 'real' actual RF output was only about 30 Milli-Watts or less!!The units were made to be as 'simple' as possible to use in the field. They had no ON/OFF switch, and raising the aerial turned them on!They also hadNOvolume control, andno'squelch' control. They only had a 'transmit' button, and nothing else!!There were later copies made by the French, (and others), and they were of a much better quality, but looked exactly the same.I'd love to have one of these for my collection, but they about $600 at least, even if you can find one...Have a nice day/night...

author: TimFox
author_rank: Super Contributor
timestamp: September 30, 2020, 02:13:08 pm
content: Lyric Opera of Chicago presented Adams' opera "Doctor Atomic" about the Manhattan Project and Oppenheimer back in 2007. The production had gone to great trouble on costumes and sets, including a very detailed and accurate prop of the "Gadget", closely based on photographs of the first tested bomb. My only disappointment was in an important scene between General Groves and the chief meteorologist, where the latter is unwilling to guarantee a forecast of the weather at the site. He is communicating with observers by radio, but instead of a walkie-talkie as posted above (originally made in Chicago by Galvin Radio, the predecessor of Motorola), they apparently used a 1970-vintage Radio Shack unit, despite the fact that the audience would have been very familiar with the original shape due to all the WW II movies and TV shows.
MOVED: Video: The 8-bit guy commits atrocities on a vintage IBM computer. - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: September 28, 2020, 02:05:57 am
content: This topic has been moved toVintage Computing.https://www.eevblog.com/forum/index.php?topic=255134.0
The realistic limits of cellular networking. - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: September 26, 2020, 11:36:34 pm
content: Recently my Bell line was becoming expensive, and went dead, and I came up with the idea of using cellular data with an unlimited plan. I actually save $5 a month now than my former bell home phone + 3rd party dsl. I pay $12 a year to host a website at my former 3rd party provider.So everything works fine until I get to the data speed limit, then I have unlimited slower speed. I find that if I constantly download things I can use the same data total as I previously did, but it handles pretty slow for live applications.So recently I was questioning, if everyone wanted to do this, and expected like a 30Mbit connection for example, what are the technical limitations? Is there like a need to have more towers, or is it even possible for everyone to be doing this in a dense location? I am guessing the main problem is the cell tower's fiber data link bandwidth.I don't understand what incentive there ever was for providers to operate cell towers. The best sense I can make of it is that it is good for spying on people and finding them. It is confusing how different providers have different towers. I turned off roaming because I expect there could be charges.Also like what is the maximum data bandwidth of RF in general, something like 300Gbit? I mean like there is hdtv, radio, etc in there. I am sure there is an attenuation/range compromise?

author: PlainName
author_rank: Super Contributor
timestamp: September 27, 2020, 12:59:21 am
content: QuoteI imagine one incentive, albeit perhaps a small one, is to be able to connect to their customers' phones.

author: tautech
author_rank: Super Contributor
timestamp: September 27, 2020, 05:27:52 am
content: Quote from: msuffidy on September 26, 2020, 11:36:34 pmYou guess correctly although not all towers have a fiber backhaul as some have p-p wireless connections.This might be a 1 GB/s wireless connection but often is less depending on the HW used and its carrier frequency.Here in NZ providers manage data connections in various ways, some limit the # of permanent connections while others don't so speeds drop to hell in times of high demand.
photodiode with led  - Page 1
Forum section: electronics / general

author: harrysmith
author_rank: Contributor
timestamp: September 24, 2020, 05:02:33 pm
content: hello community. I hope you are welloperation of the assembly when the obstacle is removed and when it is in place between the Led and the photodiode ?a remote control tester is it possible with this assembly?

author: Zero999
author_rank: Super Contributor
timestamp: September 26, 2020, 03:19:45 pm
content: That's a pretty standard setup. What's your question?

author: DrG
author_rank: Super Contributor
timestamp: September 26, 2020, 04:03:12 pm
content: Quote from: harrysmith on September 24, 2020, 05:02:33 pmTechnically, yes. Of course you need to add a few things. Here is what you are describing - used commonly as an "end stop".You need to hold the remote that you are testing right up to the unit, trying to hit the detector. It should be able to tell you whether "something" is coming out of the remote.You would be able to tell more (like distance) using one of these.But, remotes are typically encoded, not just a presence or absence / on or off. These are fun and very cheap kits that, along with a controller, you can play with.If you have a time machine, you can go pick up one of these at the Shack.
JYE Tech DSO-150 ("DSO SHELL"): mod to make firmware updates more convenient - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 24, 2020, 01:15:08 am
content: I had to update the firmware on my JYE Tech DSO-150 (aka "DSO SHELL") toy scope, and since it's quite the palaver to have to take it apart, solder bridge JP1 & JP2, connect wires to the UART etc, I made a crude mod to enable me to connect my "Bus Pirate" to the 'scope every time I want to repeat this firmware upgrade procedure. In order to facilitate the enabling of bootloader mode, to trigger the 'scope to enter the mode required to upgrade F/W, I soldered two tactile buttons on the end of flying leads (JP1 & JP2 need to be shorted when booting up to enter bootloader mode, so depressing the two tactile buttons accomplishes this); yes it's crude, but it works. I recycled a 10-pin IDC plug with ribbon cable, which is the exact plug "Bus Pirate" uses to interface, to connect the "Bus Pirate" to DSO-150.In order to set the "Bus Pirate" in transparent UART bridge mode... well, I am sure you don't need me to hand-hold you on that trivial operation!I apologise for the attached image quality; I tried to compress the pictures so I do not exceed the attachment limit.Additionally, you may like how I use my "JOBY" cellphone tripod clamp to hold the 'scope, attached to my GorillaPod tripod. It really is VERY sturdy, and the clamps have a thick rubber coating which grips the 'scope VERY securely!
sleeve-case for Lenovo Carbon X1 Gen5:: imore difficult than how I thought - Page 1
Forum section: electronics / general

author: 0db
author_rank: Frequent Contributor
timestamp: September 24, 2020, 12:56:45 pm
content: My temporary laptop for the next two mouths is a Lenovo Carbon X1 Gen5.I Need a thin sleeve to secure it for work. Of course the internet is plenty of bags, and Amazon offers a lot of them, but ... a lot for a lot of bags they say "it's for a 14 inch laptop", "it's for a 13 inch laptop", which is not enough to describe anything useful when the inner dimension is just missing or wrong.The ideal would be something thin that can fit into a backpack or messenger bag, shock and possibly water proof.Solved: uk.shamballa has suggested the "LP135-14U" bag, which is perfect!
Where to buy V/I LED panel meter with high-side Isense and +/- current. - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: September 20, 2020, 08:04:02 am
content: So I'm looking for a voltage and current LED panel meter that will showSpecs- DC Voltage = 0-16V with 0.1V or better resolution- DC Current = +/- 6A with 0.1A or better resolution (mustbe able to read negative) -- Must be high-side current sense (hall effect is fine)- Max $20 each, ideally $10-$15. Doesn't need to be super high quality for this intended use.Optional / Nice to have- Bonus points if it shows Watts too, but that isn't needed.- Also bonus points if the unit is properly isolated on the power or on the I sense side to avoid shorts when trying to use multiple units to measure different areas of the same circuit.Any recommendations or links?Thanks for your help

author: Psi
author_rank: Super Contributor
timestamp: September 20, 2020, 08:56:25 pm
content: Nevermind, i needed to alter my search terms abit on aliexpress for them to show up.I have a few options now.
Want tips on DC-DC psu's in dumpster - Page 1
Forum section: electronics / general

author: stenor
author_rank: Contributor
timestamp: September 25, 2020, 08:15:10 am
content: Want to know if there are some good, common targets to look for in the e-waste.Looking for:High current, 10A++DC input ~36-100v, output variable or 12/24/48vSimple/sturdy construction, preferablyGood efficiencyI read that some atx psu's can run directly on dc, although I wonder about efficiency. I'd be feeding it maximum ~70v dc.

author: Kjelt
author_rank: Super Contributor
timestamp: September 25, 2020, 08:19:38 am
content: IIANM most modern PC PSUs run on a 12V rail, so if you open them up you can find 12-5VDC-DC converters and 12V-3.3V DC-DC converters or 5V-3.3VDC-DC converters.However they are 85-92%efficient on high current loads only, if you only draw an amp or less they might end up in the low 80s % eff.

author: daqq
author_rank: Super Contributor
timestamp: September 25, 2020, 01:38:05 pm
content: In the better class of e-waste (high end servers, special tech), look for anything labelled VICOR. They make some delightful power modules which pack amazing features into deceptively small sizes.Variable output however is rare - best you can hope for is some center voltage around which you can slightly adjust by +/- 10%. Or maybe abusing sense lines? But not by much.

author: Cubdriver
author_rank: Unknown
timestamp: September 27, 2020, 08:37:01 am
content: Quote from: daqq on September 25, 2020, 01:38:05 pmTheVictorVicor Maxi/Mini/Micro series of D.C.-D.C. bricks can be trimmed from 10% (lower if loaded sufficiently) up to max using the 'SC' pin - we used them to drive and regulate variable output RF power supplies at my previous job by controlling the applied voltage. Their packaging efficiency seems to have improved since I last used them in 2007 - IIRC back then the full brick was good for 200W and they now do 400 and 500W units in that package, but it's been a loooong time so I may be misremembering the exact detail in the physical size vs output. I know we used two different generations of them over the years I worked there.They proved to be very user friendly implementation-wise, and were quite reliable, too.-Pat<Edit - goddamned autocorrect!!!>

author: daqq
author_rank: Super Contributor
timestamp: September 27, 2020, 10:09:56 am
content: Quote from: Cubdriver on September 27, 2020, 08:37:01 amOh yes, they are very good devices, I used them for weird stuff as well. The modern ones have an insane power per volume ratio, see:http://www.vicorpower.com/products?productType=cfg&productKey=DCM3717S60E14G5TN0As to their control interface, the ones I've worked with were pretty much 'just add some caps and you're good'.
JYE tech DSO-112a ("coral") flaw - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: September 20, 2020, 05:53:21 am
content: Okay so I have one of these pretty cute JYE tech DSO-112a (aka "DSO CORAL") 'scopes, and its alright-ish, but what bugs and baffles is that the BNC is dangling at the end of some coax, and the 'scope end of the adapter is some tiny gold press-fit coaxial connector, which is janky and loose and can swivel around unimpeded... now BNC is of a sprung locking bayonet mating mechanism, so why on earth was this "novelty toy" connector system chosen for a higher end (relative) 'scope when cheaper models such as DSO-150 (aka "DSO SHELL") use normal BNC?Colour me baffled. The connection is flaky and noisy... any suggestions?Ta VERY muchly.
what happens with not suitable xbox and ps cpu/gpu chips? - Page 1
Forum section: electronics / general

author: aqarwaen
author_rank: Regular Contributor
timestamp: September 20, 2020, 12:02:28 am
content: i just wonder what they do with all chips what they cant use on any consoles,but are stil ok to used?are they sold 3th party or what they do with not suitable chips?