hybridfree/eevblog-posts huggingface dataset:
How to get email notifications for responses to my posts - Page 1
Forum section: electronics / general

author: billbyrd1945
author_rank: Regular Contributor
timestamp: February 25, 2022, 04:00:28 pm
content: PS: For the life of me I cannot get my account or profile configured so that I get emailed when someone responds to my posts. I've tried several times but can't get it to work.

author: PlainName
author_rank: Super Contributor
timestamp: February 25, 2022, 04:35:23 pm
content: What have you tried several times? I would suggest your settings under the notification tab in your profile might need checking (and/or your specified email address) but without knowing what you've already tried (or not) I'd be wary of pissing you off by suggesting something you've already tried, possibly several times.

author: billbyrd1945
author_rank: Regular Contributor
timestamp: February 25, 2022, 05:01:13 pm
content: This is how I currently have it. I'm not about to get pissed off at the generosity of free help.

author: PlainName
author_rank: Super Contributor
timestamp: February 25, 2022, 05:16:39 pm
content: OK, you need the notifications enabled as well. Profile->Account Settings and then hover over 'Modify Profile' (there must be a way to get there properly, but maybe someone else knows that). Pick the notifications entry.

author: billbyrd1945
author_rank: Regular Contributor
timestamp: February 25, 2022, 05:41:59 pm
content: I think I may have finally got it. This post will be a test. My password manager had two entries for EEVblog. That always helps :-)Anyhow, I'll see shortly.Nope. Still doesn't work.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 25, 2022, 05:56:44 pm
content: In case you want to check by visiting the forum instead of waiting for emails, there is a link at the top of each webpage, on the right hand side of your EEVblog avatar, called "Show new replies to your posts.". Then, the small "New" icon near each topic will position the page to the first new reply not yet read by you.If you click on that text at the righthand side of your avatar (in the banner area of the page), it will open a page with all the places where you have unread replies.Same for "Show unread posts since last visit.", that's another link to see new posts, except that's for the whole forum and not for just the threads where you wrote.

author: billbyrd1945
author_rank: Regular Contributor
timestamp: February 25, 2022, 06:06:14 pm
content: Yes. Thank you. I think I finally have the email thing straightened out though I haven't received any yet.
defeating stelath - Page 1
Forum section: electronics / general

author: m3vuv
author_rank: Super Contributor
timestamp: February 26, 2022, 09:19:50 am
content: Hi all,Just an interesting snippet of info i thought i would share as may be relevent to the current ukraine issues,a few years ago i was chatting to an avionics expert from uk raf waddington in the pub,we got onto te subject on radar stealth technoligy,the balkans war came up,he said they were managing to defeat stealth by using old radar sets with old filtering,ie look at were there is no background clutter on the screen,sort of an inverted radar image,Ie look for a clear space on the display and theres your target,anyone else heard of this,he is a clever guy so dont think its b.s,what do you think?.hope i dont get a visit from the men in black for posting this as supposidly its classified info lol.

author: SeanB
author_rank: Super Contributor
timestamp: February 26, 2022, 09:28:33 am
content: Only works with primary radar systems, where you turn off ground clutter removal, which simply removes all static returns. However most stealth aircraft will absorb a large portion of the incident energy, and typically you do not have much clutter, except at very low angles, and thus the shadow is going to be hard to detect, as there will be essentially no reflections returned, as the energy will be leaving the planet.Yes you can detect a low flying aircraft because it will make a shadow at low angles, and when it is close by, so already well within range for it to have left a nice present, being aimed directly at this bright RF emission source, and probably only a half second away from impact.

author: dmills
author_rank: Super Contributor
timestamp: February 26, 2022, 12:43:50 pm
content: The really fun observation is that most stealth aircraft are designed to defeat modern radars that tend to be up in the multi GHz region (For good angular resolution from a small antenna), but if you have the space then MUCH lower frequency systems are useable, and certainly there have been stealth aircraft that turned out to be quite detectable on low band radars that would not look out of place in WW!!.IIRC one of the EU defence companies pulled this party trick at an air show a few years back, caused some red faces from the US contingent.
How to electrocute God? - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: February 24, 2022, 02:52:13 am
content: does someone know what resistance to expect? Does holly water help conductivity?AC or DC Current Voltage is better?If god die where he will go then?

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 24, 2022, 02:54:36 am
content: Back in the Edison days, the answer of the second question would have been obvious. At least to him.

author: xrunner
author_rank: Super Contributor
timestamp: February 24, 2022, 02:56:54 am
content: I would guess it take an infinite amount of current to zap a God, which could only be supplied by a God. Therefore you could do it if the God wanted you to electrocute it (because It would be the only way to get that much current to give you to zap it with).

author: MK14
author_rank: Super Contributor
timestamp: February 24, 2022, 03:24:02 am
content: Quote from: strawberry on February 24, 2022, 02:52:13 amDoing that, might provoke them into shouting out some words of infinite wisdom.Such as "Never, ever post while under the influence of anything".

author: eti
author_rank: Super Contributor
timestamp: February 24, 2022, 03:29:29 am
content: Quote from: strawberry on February 24, 2022, 02:52:13 amWhat narcotic delusion are you under? This garbage needs canning.It's amusing to no end that you'd think GOD can die. You're in a trance. Wake up and wise up.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: February 24, 2022, 04:28:31 am
content: Quote from: strawberry on February 24, 2022, 02:52:13 amI think you're not realizing that the conditions that you are expecting to apply will change when the supreme being can change the rules of physics as we know it.

author: jh15
author_rank: Frequent Contributor
timestamp: February 24, 2022, 04:30:50 am
content: I was caught as a kid soaking my speaker wires in a holy water bowl at a church. I repressed any memories of the penance.

author: Kim Christensen
author_rank: Super Contributor
timestamp: February 24, 2022, 07:22:29 am
content: Quote from: strawberry on February 24, 2022, 02:52:13 amHe is the Alpha and the Omega: One ohmQuotePlay ACDC at full volume. Something about a highway to h...QuoteThe answer is 42.

author: Halcyon
author_rank: Unknown
timestamp: February 24, 2022, 09:20:34 am
content: You can only electrocute beings that are real. A figment of one's imagination does not count, unless you mean electroconvulsive therapy, then yeah I'll accept that.
DV Video - Anyone still use it? - Page 1
Forum section: electronics / general

author: steve30
author_rank: Frequent Contributor
timestamp: February 23, 2022, 02:58:30 pm
content: Does anyone here still use the DV codec for video? I use it in the form of MiniDV tape camcorders for my hobby video projects, and I'd assume it still sees some use among hobbyists who have a soft spot for old formats, but I'm curious as to whether there are many professionals/broadcasters around the world who still use it.I was recording a political protest with my Canon XHA1 camcorder the other week (in DV mode), and stood next to me was someone who I think was from ITV news, who had a fancy modern Sony 4K camera. I took a look at Sony's professional catalogue to see what is available these days and was quite surprised to see that DVCAM (Sony's pro variant of DV) is not only present on some of their 4K models, but is still an advertised feature!So, with most professionals and broadcasters being fully HD these days, are there any out there who still actively use DV/DVCAM/DVCPRO?

author: SeanB
author_rank: Super Contributor
timestamp: February 23, 2022, 03:51:40 pm
content: DextersLab is the one offhand, who has a lot here on Quantel Paintboxes, and the various interesting fixes he has done over the years to get them working again, and reverse engineering the hardware and the PAL Quantel used to set option bits in the machines, such that you can literally make the base model the top range one with only a single change to the configuration file written into a PLA chip.
JAMES WEBB SPACE TELESCOPE cooling it's jets - Page 1
Forum section: electronics / general

author: GreggD
author_rank: Regular Contributor
timestamp: February 21, 2022, 08:54:25 pm
content: Current status:https://jwst.nasa.gov/content/webbLaunch/whereIsWebb.html?units=metricThe temperature in French Guiana (launch site) is virtually all year around the value of 30°C 303°K 86°FIf Webb was not cooled on the pad then when the fairings exposed Webb to space, the Instrument Radiator would radiate 468W/m²Now almost two months later it has cooled to 43°K -231°C and radiates 172mW/m²Dropping another 6.68° photon radiation will drop by 50% This is why it will take months to cool.At 20°K it will radiate 9mW/m²Instrument Radiator Temp(K) 42Space Temp (K) 4Area m² 1Emissivity 0.98Stefan Boltzmann constant 5.6702E-08Watts of Photon radiation 0.17289Emissivity*Stefan Boltzmann constant*Area m²*((Instrument Radiator Temp (K)E4)-(Space Temp (K)E4))The mirrors are gold and almost do not radiate, emissivity 0.02, they cool from the back non-gold side.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 21, 2022, 10:13:20 pm
content: Quote from: GreggD on February 21, 2022, 08:54:25 pmCool, never thought of that aspect, thanks!On a second thought, maybe they should have heat it on the launch pad instead.https://en.wikipedia.org/wiki/Mpemba_effect

author: Rick Law
author_rank: Super Contributor
timestamp: February 21, 2022, 10:22:13 pm
content: We have waited for 15 years for it to launch (initial planned launch 2007), another few months is not going to make much difference...But I sure am anxious to see what new things we can learn. I am retired now, otherwise known as being "in God's waiting room", tick tock tick tock tick tock...Come'on, cool it, soon... I am anxious and impatiently waiting for the telescope results.
Wanna see some 1970s PCB CAD? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 19, 2022, 03:47:43 pm
content: I like this stuff, I want all PCB software to bloop and beep like that!

author: free_electron
author_rank: Super Contributor
timestamp: February 19, 2022, 05:35:28 pm
content: Applicon Bravo. They used storage tubesWe also had CalMa cad systems for IC layout. driven by a Nova 2600 computer with a VAX77/90 as backbone to run spice. 1989...Applicon mechanical cad lives on as Pro/engineer. ( PTC bought them . )

author: free_electron
author_rank: Super Contributor
timestamp: February 19, 2022, 05:41:48 pm
content: this one shows digitizing and also IC layout on the Appliconthey did all of this with 64k of ram... we can't even make bootloaders that fit in that anymore.
What happened with electro-tech-online.com - Page 1
Forum section: electronics / general

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: January 05, 2022, 02:07:36 pm
content: "page can not be loaded" forever.

author: eti
author_rank: Super Contributor
timestamp: January 06, 2022, 01:12:32 am
content: Quote from: MacIntoshCZ on January 05, 2022, 02:07:36 pmWorks here. Maybe you have a DNS error etc.

author: Brumby
author_rank: Unknown
timestamp: January 06, 2022, 01:15:07 am
content: No problems here. Loaded up pretty quickly, too.

author: xrunner
author_rank: Super Contributor
timestamp: January 06, 2022, 01:17:54 am
content: Working here ...

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: January 06, 2022, 06:48:12 am
content: Thats strange. Instead of page could not have been loaded i get today warning from provider.This page is blocked becouse of dangerous content.WTF

author: Zero999
author_rank: Super Contributor
timestamp: February 19, 2022, 09:07:44 am
content: I've not been there for years.Do the moderators still permit lazy students and free energy trolls to post crap and ban those who challenge them?
Anyone bought from micro-semiconductor.com AKA Micro-Semiconductors.com? - Page 1
Forum section: electronics / general

author: MotoDan
author_rank: Contributor
timestamp: February 17, 2022, 08:38:27 pm
content: Wondering if anyone has ever bought from this supplier? They appear to be in HK. Can't seem to get a reply after numerous attempts - before and after the Chinese NY.Thanks

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: February 18, 2022, 01:15:14 am
content: Looks super legithttps://au.trustpilot.com/review/micro-semiconductor.comIf you are after hard to source components then suggest givingwww.netcomponents.coma go, as they tend to vet all the suppliers they list (plus when you register each supplier has a rating from previous orders). Only downside is that to see who has stock you need a paid account, though you can get a free one if you are an OEM
What Really Happened During the 2003 Blackout? - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: February 16, 2022, 04:06:44 am
content: What Really Happened During the 2003 Blackout?A good reading/breakdown and description of the technical analysis of how a major NorthAmerican North Eastern major blackout back in 2003 came about. Enjoy:

author: SilverSolder
author_rank: Super Contributor
timestamp: February 16, 2022, 06:10:36 pm
content: Very interesting. Shows how a really bad day can sometimes start with blue skies and sunshine...
Can anyone help with another forum - svetelektro? - Page 1
Forum section: electronics / general

author: Inari
author_rank: Contributor
timestamp: February 15, 2022, 02:57:08 pm
content: I'm trying to log in there, but for some reason it's completely hopeless. Is there anyone here who has a user on svetelektro.com forum to help me contact the topic and its author?https://svetelektro.com/clanky/spinany-regulovatelny-zdroj-80v10a-788/is interesting topic for me but files, provided there is not working today and because I cant log in, then I cant also contact this user to ask files.

author: daqq
author_rank: Super Contributor
timestamp: February 16, 2022, 07:27:32 am
content: It's a Slovakian forum, I'm there, will contact the admins, send them a link here.

author: Inari
author_rank: Contributor
timestamp: February 17, 2022, 10:09:38 am
content: Thanks for replying. I just received a mail from the administrator, the problem was probably due to some kind of geolocation, now I could log in.
Galaxy Watch Pool Water Damage Repair Attempt - Page 1
Forum section: electronics / general

author: jcrubin
author_rank: Frequent Contributor
timestamp: February 23, 2022, 08:59:11 pm
content: After a few years of use at the local pool my wife's galaxy watch had failed to turn on. This was purchased mainly for its advertised swimming exercise functions along side it's IP68 rating which should be suitable for laps. It wasn't immediately though that it was water damage until it was opened and became evident. The question then became a matter of how bad it looked versus how much functionality could be restored.Aside from the battery that became suspiciously swollen, all of the original parts were used in the repair.
On increasing the generator output line voltage - Page 1
Forum section: electronics / general

author: TiredOldDad
author_rank: Newbie
timestamp: February 16, 2022, 09:57:35 am
content: Here's a thought experiment...Our grid voltage is 230V nominal. I have a portable generator that is preset to output 220V. I want to raise the generator voltage to 230V to match the grid voltage.... no other specific reason.The generator uses an automatic voltage regulator (AVR) with a trimmer pot to vary the field voltage. Increasing the field volage raises the main stator output voltage and vice versa. That said, increasing the main stator output to 230V is a trivial task. Appliances are rated for 220-240V.Questions:1. Will this inadvertently harm, or at the least, add stress to the generator? (ie. More/less heat? De-rate it? More/less efficient?)2. Given that the appliances are rated to operate between 220-240V, how does increasing the line voltage from 220V to 230V affect the following, either significantly or subtly:a. Resistive loads? (heaters, incandescent lamps)b. Inductive loads? (fans, A/C compressors)In other words, will any of these types of appliances be more (or less) efficient at the stated higher voltage?
Cowboy work - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: February 13, 2022, 05:05:44 am
content: I found an article but noticed the wiring looking a bit dodgy how it is run.https://www.bbc.co.uk/news/uk-england-london-60364090Hackney Wick: Collapse of bar floor injures 13Notice:Two cable wall clips on the left, and only one clip on the right.As pointed out by Dunkemhigh and on closer look not the same length with the right smaller than the left.I can barely see what looks like a gland between the light switchesontopunderneath joining onto the socket to the left under it.The wire seems to be curved near the support is and a bit stretched onto the socket near the window.The picture is bit unclear but near the window is that look like thick stranded core cable that's used behind walls?I have seen the sockets like that many times before wired externally where the cables are in pipes, a few very with thick plastic looking cables with a plastic cover that covers of the glands on the socket and a few in trunking.What do you see? Is it just untidy or dodgy/poorly laid out?

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 13, 2022, 02:33:24 pm
content: Looks like the floor had more than one problem also.Jeff

author: Benta
author_rank: Super Contributor
timestamp: February 13, 2022, 08:18:50 pm
content: Looks like a normal British installation to me. On par with British plumbing.

author: PlainName
author_rank: Super Contributor
timestamp: February 13, 2022, 09:31:39 pm
content: QuoteWhat's the issue with that? If it's distance between supports then it's about the same for left and right. There are two clips on the left leaving short stubs into the (alleged) glands, but presumably that's because a single clip would have a too-large distance between supports. Or have I missed something?

author: themadhippy
author_rank: Super Contributor
timestamp: February 13, 2022, 09:36:21 pm
content: QuoteDesigned installed and signed off by the same person who designed installed and signed off the new mezzanine floor

author: MrMobodies
author_rank: Super Contributor
timestamp: February 13, 2022, 11:47:17 pm
content: Quote from: dunkemhigh on February 13, 2022, 09:31:39 pmNo, sorry about that, I zoomed up closely just and saw that the right is smaller.At first I thought they were about the same length.

author: Gyro
author_rank: Super Contributor
timestamp: February 14, 2022, 08:30:28 pm
content: Quote from: Benta on February 13, 2022, 08:18:50 pmMore like a British kitchen fitter. They undertake electrical and plumbing modifications with little or no clue about what they are doing.. or compliance with the relevant regs.
Had to troubleshoot this today - Page 1
Forum section: electronics / general

author: zker666
author_rank: Contributor
timestamp: February 11, 2022, 11:28:59 pm
content: Six 66P connectors on each side, not 1-1. Over 792 conductors in this, with no part number, wire run list, or harness print to be found. Probably made in the late 90's. Used in semiconductor ion implant test equipment. I hated today!

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: February 12, 2022, 10:03:57 pm
content: Oh, I pray to never have to do things like that again.Obviously in this day and age you can stamp an esp32 and forget about cables ha ...
Very funny humor for a very limited audience - Page 1
Forum section: electronics / general

author: saddle_au
author_rank: Newbie
timestamp: February 12, 2022, 07:31:52 am
content: It's a humidifier.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: February 12, 2022, 08:32:50 am
content: Put it in this...[ Specified attachment is not available ]

author: Brumby
author_rank: Unknown
timestamp: February 12, 2022, 01:29:20 pm
content: Someone beat you to the punch...https://www.eevblog.com/forum/buysellwanted/humydifier/msg3991193/#msg3991193
Difficult CAPTCHAs (Humour) - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: February 11, 2022, 02:10:10 am
content: I'm sure many of you have seen this one before, but I thought I'd re-post here. It made me smile.

author: SpecialK
author_rank: Regular Contributor
timestamp: February 11, 2022, 03:01:15 am
content: I'm having difficulty picking out the colour red at all. I think the picture needs a tint adjustment at least.

author: free_electron
author_rank: Super Contributor
timestamp: February 11, 2022, 03:23:00 am
content: please select all the squares with bad solder jointsplease select all the squares with broken viasplease select all the squares with broken componentsplease select all the squares with design mistakes

author: bsfeechannel
author_rank: Super Contributor
timestamp: February 11, 2022, 04:18:51 am
content: ✔️ I'm not a pick-and-place machine.

author: andy3055
author_rank: Super Contributor
timestamp: February 11, 2022, 05:18:36 am
content: What would happen if EEV blog starts using it to verify new members?

author: Halcyon
author_rank: Unknown
timestamp: February 11, 2022, 05:39:42 am
content: Quote from: andy3055 on February 11, 2022, 05:18:36 amTechnical CAPTCHAs? I like it! Maybe not that difficult though.

author: Cerebus
author_rank: Super Contributor
timestamp: February 11, 2022, 05:50:57 am
content: Quote from: free_electron on February 11, 2022, 03:23:00 amThank you for helping to design the XBOX 720.

author: TerraHertz
author_rank: Super Contributor
timestamp: February 11, 2022, 01:55:18 pm
content: Plot twist: It's a circuit board from an AI system, that has full engineering self-awareness of it's own board layouts.

author: MK14
author_rank: Super Contributor
timestamp: February 11, 2022, 02:22:29 pm
content: Thanks for the thread, because as a result of googling for similar items, I found the following hilarious, 1 min 24 sec, video:

author: Carel
author_rank: Regular Contributor
timestamp: February 11, 2022, 07:34:07 pm
content: Quote from: andy3055 on February 11, 2022, 05:18:36 amI am colourblind and using an Mtester. Report me and get me banned.

author: hans
author_rank: Super Contributor
timestamp: February 11, 2022, 07:48:27 pm
content: I had a meme floating in my head from years ago.. it has double take on this..Sorry, couldn't help the puns.

author: magic
author_rank: Super Contributor
timestamp: February 11, 2022, 09:16:57 pm
content: Quote from: SpecialK on February 11, 2022, 03:01:15 amIt's simpler than that, there are no 220Ω resistors there.

author: MrMobodies
author_rank: Super Contributor
timestamp: February 11, 2022, 10:50:15 pm
content: Please select all the squares with the magic smoke escaping.
Is FCCID website legal? - Page 1
Forum section: electronics / general

author: mrburnzie
author_rank: Regular Contributor
timestamp: February 09, 2022, 04:13:35 pm
content: Is this website legal, sharing all this info.https://fccid.io/

author: ataradov
author_rank: Super Contributor
timestamp: February 09, 2022, 04:35:39 pm
content: Legal in what sense? The official FCC database is herehttps://www.fcc.gov/oet/ea/fccidI have not compared, but I assume that this site is either scrapping the info, or just straight up doing lookups on the official site. Neither is illegal, but I see no point to doing that.

author: mrburnzie
author_rank: Regular Contributor
timestamp: February 09, 2022, 04:57:48 pm
content: Asking if it's legal, because it's showing internal, external and test reports of the device.

author: tom66
author_rank: Super Contributor
timestamp: February 09, 2022, 05:46:45 pm
content: Many of those are public.Only in some cases can confidentiality be applied.

author: rpiloverbd
author_rank: Regular Contributor
timestamp: February 09, 2022, 11:48:39 pm
content: I agree with Ataradov.

author: thm_w
author_rank: Super Contributor
timestamp: February 10, 2022, 10:41:17 pm
content: huh, surprised they bother with FCC for some kind of mining product:https://fccid.io/2A3CX-FN2804172Lots of weird stuff in there.

author: Cerebus
author_rank: Super Contributor
timestamp: February 11, 2022, 06:03:06 am
content: Quote from: thm_w on February 10, 2022, 10:41:17 pmIt may be a side gig to a scraping effort that was part of an open source business intelligence gathering tool. You can tell quite a lot about what a potential competitor is up to by following their FCC filings. People have scooped news stories this way before.

author: ataradov
author_rank: Super Contributor
timestamp: February 11, 2022, 06:21:07 am
content: I think the comment was about the need to file for FCC for some strange hat on top of RPi4. But I guess you have to if you want to sell it in any sort of quantity.The site itself is pointless, all that info is published on the FCC site anyway. There is no new intel gathered here.And FCC allows for a non-disclosure period, you just have to request it along with the filing. So if FCC leaks stuff for you, you only have yourself to blame.
Alexa is going to close its web ranking service - Page 1
Forum section: electronics / general

author: Picuino
author_rank: Super Contributor
timestamp: February 09, 2022, 07:33:00 pm
content: I often use alexa rank to check the position of my website and similar sites. From March it will not be possible because the service will be closed.Example of eevblog.com alexa information:https://www.alexa.com/siteinfo/eevblog.comIt seems that the Tiobe index has decided to replace the Alexa service withSimilarweb's.I don't quite like it, among other things because many times my page doesn't have enought visitors to appear in it.Does anyone know of other free services similar to Alexa?
IECEX ex ia iib lithium battery? - Page 1
Forum section: electronics / general

author: pj
author_rank: Contributor
timestamp: February 08, 2022, 02:39:07 pm
content: This is a long shot but just wondering if anyone has successfully got any lithium ion batteries through IECEX testing for use in Ex ia IIB areas?I'm on round three of testing here and it's emptying my wallet and motivation. Looking for a lithium ion battery with no protection circuits that will pass the short circuit test. Does anyone have any suggestions?Thanks
How can this happen - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: February 08, 2022, 08:43:06 am
content: How can the display turn upside down due to wrong resistors in the LCD.

author: gamalot
author_rank: Super Contributor
timestamp: February 08, 2022, 10:37:47 am
content: Maybe it's just a bit in one of the registers in the LCD controller that wasn't initialized correctly.

author: timenutgoblin
author_rank: Regular Contributor
timestamp: February 08, 2022, 10:49:33 am
content: Quote from: G7PSK on February 08, 2022, 08:43:06 amLooking at the YouTube thumbnail image, I would argue that the dial face has been rotated 180 degrees and not inverted (vertically flipped) as the YouTube video title suggests. If the dial face was inverted, the text would read backwards and not forwards.

author: Ian.M
author_rank: Super Contributor
timestamp: February 08, 2022, 11:01:13 am
content: 'Inverted' has two possible meanings - positionally inverted or color inverted. It wasn't clear which was the fault behind this recall, but end user photos (https://www.core77.com/posts/111994/Hyundais-Strange-Cold-Weather-UI-Bug-Digital-Dashboard-Rotates-Flips-Display) show it is in fact positionally inverted by rotation (or both horizontal and vertical 'flips').Coding and testing to stringent safety standards cost money, and the more variants of the code there are, the higher the cost, and also even for modules sharing identical hardware, the cost of production is increased, and there are much higher inventory costs stocking and distributing several variants of physically identical subassemblies. Its therefore logical to assume that Hyundai decided to minimize the number of types of display subassembly required by determining the configuration to use from the dash panel its fitted in.A common way to do this without using a lot of pins is to use a potential divider in the external circuit to encode the configuration option as an analog value to be read by an ADC input. If one attempts to encode too many different choices, the values are too close together and especially if the ADC and potential divider don't share a common reference voltage, thresholds can shift resulting in the option being incorrectly decoded. Temperature extremes often cause MCU on-chip reference voltages to shift.

author: timenutgoblin
author_rank: Regular Contributor
timestamp: February 08, 2022, 11:31:55 am
content: Quote from: Ian.M on February 08, 2022, 11:01:13 amI did think to consider that the dial face was colour inverted, but then I would expect the high temperature range to be blue/cyan instead of red as shown in the YouTube thumbnail.
Rummaging Through my bin of Ancient ICs - Page 1
Forum section: electronics / general

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: February 07, 2022, 02:50:53 pm
content: While going through my bin of old ICs I ran across a DIP-8 package that identifies as a 2527-V Dual 256 bit static serial in, serial out recirculating shift register manufactured in 1973. Any thoughts on what something like this may be used for?

author: nfmax
author_rank: Super Contributor
timestamp: February 07, 2022, 02:57:50 pm
content: Probably intended for the (character) display memory of a VDU, or for desk calculator working memory

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: February 07, 2022, 03:07:41 pm
content: Funny you should mention that. I also found a 64 character 5x7 USASCII character generator chip in the collection.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 07, 2022, 03:31:55 pm
content: Computerless audio effects: delay, reverb, chorus, echo, etc.
Optical/camera question - Page 1
Forum section: electronics / general

author: Logan
author_rank: Frequent Contributor
timestamp: February 06, 2022, 03:06:21 pm
content: Hi.I want to use a single convex/concave lens between the original lens and the sensor, to compensate a wrong flange-focal-distance in a camera system. I want to know, will this change the effective aperture of the orginal lens(mainly about quantity of passing light, not boken)?Thanks.

author: BeBuLamar
author_rank: Super Contributor
timestamp: February 06, 2022, 05:22:32 pm
content: Generally you would need a concave lens to have the lens sit further away from the sensor and still can focus to infinity. In the case of the lens that has longer flange distance than the camera just put a tube in between rather than a lens element. Now doing in the first example would make the lens becomes slightly longer in focal length and thus it would have a smaller effective aperture (larger f number) but not buy much as you only extend it a few mm.
element14 retroactively gave me a 400 day lead time - Page 1
Forum section: electronics / general

author: Nogtail
author_rank: Regular Contributor
timestamp: February 04, 2022, 01:27:09 am
content: I needed a JTAG debugger for an upcoming project. Nothing commercial, so the J-Link Edu seemed like a good option. At the time it was in stock at most of the places you'd expect, but I was already placing an order with element14 so I popped it in my cart instead of paying for separate shipping from another place. A day later I get confirmation that stock has been assigned to my order with an estimated delivery date.Fast forward to today: I've received the rest of my order and was keen to start the project, so I check the order status and realise the J-Link hasn't shipped yet. On their website it has status "Contact us for more information", so I give them a call. It turns out that for some reason they no longer have stock and they estimate they'll have more stock in April... 2023. I have no idea why they didn't think it'd be useful to send me an email or something before it was sold out everywhere.Anyway, I just wanted to rant. If you need something critical to a project then maybe stay away from element14.If anyone knows any good J-Link alternatives that'd be great too.

author: boz
author_rank: Regular Contributor
timestamp: February 04, 2022, 02:39:44 am
content: Last month I ordered a 500A contactor on 5-6 days delivery, about 10 days after the order was accepted I got an email saying my credit card had been declined and would I like to continue with the order, after phoning my bank and confirming nothing was wrong with my card I told them where to stick the order, they have definitely got worse.

author: thm_w
author_rank: Super Contributor
timestamp: February 04, 2022, 11:20:56 pm
content: What is the micro?Can get a bluepill and reprogram it as a black magic probe. Or get a jlink clone.

author: VK3DRB
author_rank: Super Contributor
timestamp: February 06, 2022, 01:41:52 am
content: Worse is if you finally get the product and it is defectiveSome years ago I bought six expensive Honeywell Airflow sensors from Element 14 for around $250 each. All of them were defective. The defects were proven to be caused by Honeywell. I contacted Element 14 who said I have to contact Honeywell. I contacted Honeywell and they said I have to contact Element 14. This flip-flop buck-passing went on for about six months and I gave up in the end. Legally, it was Element 14 who should have taken them back and provided a full refund.Since that episode, I have avoided Element 14.
What else to do with a magnetic USB cable? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 05, 2022, 07:32:05 pm
content: I have 4 USB cables with magnets, without their corresponding magnetic USB heads. They have a pogo pin in the middle, just like the ones in the pic, and probably no data transfer (middle pogo pin measures continuity with the +5Vcc pin from the USB plug). The magnets are very strong.There's a special kind of fun sticking magnets attached to a wire all around the lab, can also be annoying.Feels like there should be some interesting use for them even without the micro USB heads, but not sure what. Any ideas?
Floating solar panel farms - Page 1
Forum section: electronics / general

author: MT
author_rank: Super Contributor
timestamp: February 05, 2022, 02:27:06 pm
content: Update on the concept of floating solarpanel farms with lots info on the building/manufacturing of the whole hoopla including some info on panel materials tech.Perovskite solar panels:https://www.perovskite-info.com/perovskite-solar

author: Marco
author_rank: Super Contributor
timestamp: February 05, 2022, 02:46:11 pm
content: Makes sense for reservoirs at least, just replacing the plastic balls.

author: MT
author_rank: Super Contributor
timestamp: February 05, 2022, 02:46:52 pm
content: First vid about sweetwater reservoir floating solar panel farm, second vid starts athttps://youtu.be/UeVfqiuZh9s?t=412is about their salt water floating solar panel farm.
help identifying this Aliexpress cc/cv addon module they put on server psu's  - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: February 13, 2022, 05:41:11 am
content: Recently on AliExpress, eBay, etc... I've been seeing these lithium ion battery chargers consisting of a server power supply normally an HP DPS-750/1200 or very similar and they have a module connected on the outside which must be a CC/CV controlling device...They're littered all over AliExpress. I searched all over Google and github and I can't find anything similar whatsoever.I've also looked for the module itself for sale anywhere but can't find anything.I was just able to find a picture of the internals and the PCB. It looks fairly simple. 1 IC, and a couple pots....If anyone understands how this thing is working or know where to find any information or where to buy one please leave a comment below.

author: ledtester
author_rank: Super Contributor
timestamp: February 13, 2022, 06:25:20 am
content: My sleuthing of the image points to the power supply being a Liteon PS-2751-5Q:https://www.empowerlaptop.com/p/ps-2751-5q-f3r29/The electronics looks so simple that I would hazard to guess that the power supply itself has some form of CC control via a control voltage and the box just allows you to set it.
Comedy show (quite funny!) by Ronnie Chieng Asian-American comedian - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: February 02, 2022, 08:59:12 pm
content: Ronny Chieng is really quite funny, I realized when I saw him in this series, it parodies student life and college life in MelbourneDaily Show correspondent Ronny Chieng stars in this sitcom based on his experiences as a Malaysian international student studying law in Australia.His wife grew up inMelborne and is of vietnamese descent. She has a YouTube cooking channel
Need some help identifying a part - Page 1
Forum section: electronics / general

author: cdnsoundguy
author_rank: Newbie
timestamp: February 01, 2022, 10:34:34 pm
content: Greetings,Long time lurker, first time poster.My father was an EE and after he passed a few years ago his collection of spare parts and components fell to me.I have finally found sometime to go through his collection and I came across a ziplock bag of 500 green components all marked with "LF 1/4A".Please see picture. The bag was marked "TECHTROL".Does anyone know what the part is? It has a resistance of 0.34 ohms.Thanks.cdnsoundguy

author: bob91343
author_rank: Super Contributor
timestamp: February 01, 2022, 11:33:23 pm
content: Fuse.

author: Fraser
author_rank: Super Contributor
timestamp: February 01, 2022, 11:38:59 pm
content: It is a 0.25 Ampere (250mA) PCB mounted fuse made by Littelfuse (LF)The pictured fuse appears to be from their “PICO” range ……https://m.littelfuse.com/products/fuses/axial-radial-thru-hole-fuses/pico-fuses.aspxExample datasheet:https://m.littelfuse.com/media?resourcetype=datasheets&itemid=7ef7dafd-7227-456e-888b-ea80c7afdc1d&filename=littelfuse-fuse-251-253-datasheet

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 02, 2022, 03:43:10 pm
content: Yeah, fuse. A typical use for them back then was on PC motherboards for the keyboard power line.
Manufacturing assistance - Page 1
Forum section: electronics / general

author: mrburnzie
author_rank: Regular Contributor
timestamp: January 31, 2022, 09:20:45 am
content: Is there a market for a company to help other companies with their manufacturing, meaning to help them optimize their BOM, get in contact with legit manufacturing partners and carry all the headache when it comes to manufacturing your embedded or other electronics device?

author: jonpaul
author_rank: Super Contributor
timestamp: January 31, 2022, 10:49:40 am
content: Hello: Many experienced consultants and manufacturing liaison firms exist, but most large firms will use only their in-house resources for legal, cost and liability reasons.Any errors on the part of the consultant will be catastrophic if production is halted.Jon
Cheap SMD Electrolytic capacitor Amazon KITS vs Mouser / DigiKey Caps - Page 1
Forum section: electronics / general

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: January 31, 2022, 03:44:20 pm
content: Is there a lot of quality difference between buying bulk SMD electrolytic capacitors from vendors on Amazon compared to buying name brand electrolytic SMD capacitors from Mouser or DigiKey?The cost to buy a handful of these on Mouser or DigiKey is prohibitive (very expensive) comparatively speaking with many being $1.00 - $3.00 EACH.I'm wondering if the bulk Amazon kits are really made by different manufacturers of if they all basically come from the same sources.Anyone with actual experience with these bulk kits?

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: January 31, 2022, 03:49:54 pm
content: Another consideration is the level of difficulty to replace the capacitor.In some cases it can be extremely difficult to replace one of these. Such as 25 - 40 pin add on boards with no access in tight places where the board and all it's pins would have to be de soldered to replace the SMD electrolytic capacitor.

author: Simon
author_rank: Unknown
timestamp: January 31, 2022, 09:00:51 pm
content: It's a toss up, you pay for a name and you get to have expectations. You buy on places like amazon from any purveyor of old rope and you take your chances. If you stuff matters like medical, automotive, military or anywhere else where a seriously pissed off large customer is not a good idea don't use them. If you sell to various people then you may get lucky.

author: BrokenYugo
author_rank: Super Contributor
timestamp: January 31, 2022, 09:18:54 pm
content: You never know with this stuff, but generally speaking the farther from the cheapest, most jellybean parts imaginable you get, the sketchier the cheap no name Amazon/eBay/Aliexpress parts become. Things like the small signal BJTs, ceramic and maybe polyester caps, resistors, diodes, etc. are typically fit for hobby use at least, but outside of that you see a lot of parts that are recycled, remarked to higher spec, dumpster dived defects, totally fake, etc. I'd at least go to LCSC for electrolytic caps you can trust farther than you can throw.IDK about the SMD ones, but I know the leaded assortments are known to not even meet their voltage ratings.

author: Simon
author_rank: Unknown
timestamp: January 31, 2022, 09:46:13 pm
content: I have not forgotten the silly cow that bought a bunch of 1µ 25V capacitors off me and then complained claiming that the 25V ones were rarer and sought after high quality. I was rather blunt with her and ebay for once kept out of it and left me to make her pay the return postage and not be refunded the outgoing postage so that she could run off and buy her $1 firecrackers from china.
What kind of connector is this - Page 1
Forum section: electronics / general

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: January 28, 2022, 10:01:50 pm
content: I found this in my bucket of bits and doesn't mate up with anything I have. What is it?

author: TerraHertz
author_rank: Super Contributor
timestamp: January 29, 2022, 12:00:05 am
content: Manufacturing defect?It's pretty clearly missing an outer part. Without which there's no shield connection and the thing can't be even close to 'coaxial.'

author: Caliaxy
author_rank: Frequent Contributor
timestamp: January 29, 2022, 02:17:00 am
content: Looks like an MHV (high voltage stuff) tee adapter with a missing locking collar.https://www.pasternack.com/mhv-female-male-female-tee-adapter-pe9211-p.aspx

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 01, 2022, 12:38:36 am
content: BNC "T" never seen one made like that. defect or modified?Jeff

author: amyk
author_rank: Super Contributor
timestamp: February 01, 2022, 02:23:08 am
content: BNC T missing its collar on one leg.

author: Brumby
author_rank: Unknown
timestamp: February 01, 2022, 04:00:01 am
content: Quote from: amyk on February 01, 2022, 02:23:08 amYep.

author: jonovid
author_rank: Super Contributor
timestamp: February 01, 2022, 11:47:15 am
content: missing the collar & the in-side sleeve that holds it in place

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: February 02, 2022, 09:48:42 pm
content: Quote from: amyk on February 01, 2022, 02:23:08 amYep.
Sell components on ebay - Page 1
Forum section: electronics / general

author: hnjmkl
author_rank: Regular Contributor
timestamp: January 30, 2022, 06:34:54 am
content: I have a certain No. of components that I would like to sell on ebay, someone says that it is possible to create a list with Openoffice or Word and insert it in ebay, in this way the browsers would index the typed word, referring to my ebay page containing the typed word, I think this is not possible, if anyone has information about this they are welcome.
high frequency transformer on 60hz - Page 1
Forum section: electronics / general

author: OwaisAhmed
author_rank: Contributor
timestamp: January 25, 2022, 05:56:27 pm
content: i was looking for low voltage ac supply transformer. that i can use on breadboard to practice about what i learn. so i had a lcd smps i took a transformer from it that convert 220 ac to 12v and 5v. i know that those transformer work on around 300khz frequency. so if i run this on 60hz. what could be the problems and why frequency matter in transformer. i actually tried it shows around 2 to 2.5v on ouput.

author: TimFox
author_rank: Super Contributor
timestamp: January 25, 2022, 06:03:32 pm
content: High frequency transformers have lower inductance than low frequency transformers. The “magnetizing” inductance (approximately equal to the self-inductance of the primary winding) is in parallel with the ideal transformer’s primary; the low inductance of the h.f. unit essentially shorts out the primary at low frequency.Check out the internet on transformer models, including “magnetizing” and “leakage” inductances to get a feel for frequency effects.

author: bob91343
author_rank: Super Contributor
timestamp: January 25, 2022, 06:24:12 pm
content: It's almost a certainty that running a transformer on a much lower frequency will result in disaster. The core will saturate immediately, causing high current limited only by winding resistance. First the explosion, then the smoke.

author: Circlotron
author_rank: Super Contributor
timestamp: January 28, 2022, 01:09:58 pm
content: The voltage a transformer will tolerate varies approximately with the frequency supplied to it. A transformer from a 220VAC SMPS would likely have +/- 300V applied to the primary, and if it was designed for 300kHz then it might only tolerate (60Hz/300,000Hz) x 300V = 0.06V. Not much all. Probably an oversimplification, but you get the general idea.

author: Kim Christensen
author_rank: Super Contributor
timestamp: January 30, 2022, 05:28:20 am
content: If you just want a source of low voltage AC to experiment with as a hobbyist, then look into getting a wallwart with an AC output. (No rectifier/cap inside):https://www.allelectronics.com/category/912/ac-ac-wall-adapters/1.html(Not endorsing this site. Just an example)
Can anyone identify this addon cc/cv module on server psu? - Page 1
Forum section: electronics / general

author: bigjoncoop
author_rank: Regular Contributor
timestamp: January 29, 2022, 06:45:33 pm
content: Hey fellaz,Recently on AliExpress, eBay, etc... I've been seeing these lithium ion battery chargers consisting of a server power supply normally an HP DPS-750/1200 or very similar and they have a module connected on the outside which must be a CC/CV controlling device...They're littered all over AliExpress. I searched all over Google and github and I can't find anything similar whatsoever.I've also looked for the module itself for sale anywhere but can't find anything.I was just able to find a picture of the internals and the PCB. It looks fairly simple. 1 IC, and a couple pots....If anyone understands how this thing is working or know where to find any information or where to buy one please leave a comment below.