hybridfree/eevblog-posts huggingface dataset:
The labels lie! Labels used to trick image recognition - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: March 09, 2021, 07:16:05 am
content: Title says it all:https://www.theverge.com/2021/3/8/22319173/openai-machine-vision-adversarial-typographic-attacka-clip-multimodal-neuron

author: retiredfeline
author_rank: Frequent Contributor
timestamp: March 09, 2021, 07:24:14 am
content: Another report:https://www.theguardian.com/technology/2021/mar/08/typographic-attack-pen-paper-fool-ai-thinking-apple-ipod-clip

author: ataradov
author_rank: Super Contributor
timestamp: March 09, 2021, 07:51:21 am
content: To be fair, humans are also tricked by all sorts of optical illusions. They are not that obvious, of course, but still.The danger of automated image recognition is that it can be mass rolled out. On the other side, there is a clear countermeasure.

author: ConKbot
author_rank: Super Contributor
timestamp: March 09, 2021, 05:07:26 pm
content: Eh, people get fooled by obvious scams on aliexpress where they write a different label on something and they believe the label without question. This one is pretty low effort, but printing "4TB" on a 4gb thumb drive isn't exactly high effort.

author: ejeffrey
author_rank: Super Contributor
timestamp: March 09, 2021, 05:34:04 pm
content: It's also just an issue of humans over-interpreting the results of image classifiers. You could argue that the vision tool is correctly identifying that the most prominent feature in that photo is a sign that says iPod (what is this 2005?). It also didn't tag either photo as "fence" despite the fence in the background. Humans understand the semantic intent of the person who arranged the photo that the sign is intended as an (incorrect) label for the thing behind it, but that is a higher order process than simply categorizing objects -- categorizing the relationships between multiple objects in a scene.

author: Gregg
author_rank: Super Contributor
timestamp: March 10, 2021, 03:31:07 am
content: I take it from this that in order to stay alive and fool an autonomous vehicle; a pedestrian should have big signs saying “TRUCK”* visible from all sides.*Or similar depending on location. Other good signs might be something like “LAWYER”

author: Nominal Animal
author_rank: Super Contributor
timestamp: March 10, 2021, 04:48:56 am
content: Does anybody know where I can buy caps and beanies with "THIS IS NOT THE PERSON YOU ARE LOOKING FOR" on them?(No, wait. That's too long. "NOT HIM" would be better.)

author: retiredfeline
author_rank: Frequent Contributor
timestamp: March 10, 2021, 04:54:30 am
content: Quote from: Gregg on March 10, 2021, 03:31:07 amThat requires too much reasoning from the system. WALL or DITCH would do.
Small guides with information about programming and electronics. - Page 1
Forum section: electronics / general

author: Joao Carvalho
author_rank: Contributor
timestamp: January 18, 2021, 07:53:51 pm
content: Hi,For some time, I have being making small guides with information that I aggregated and organized along the way and that I consider to be relevant is the subjects of programming in general, systems programming, embedded programming and in electronics.I would like to share the links here in the hope that they also could be useful to others.All my guideson Linux - Programming - Embedded - Electronics - Aeronauticshttps://github.com/joaocarvalhoopen/Guides_Linux-Programming-Electronics-AeronauticsHow to learn modernLinuxhttps://github.com/joaocarvalhoopen/How_to_learn_modern_LinuxHow to learn modernelectronicshttps://github.com/joaocarvalhoopen/How_to_learn_modern_electronicsMost commoncomponents in electronicshttps://github.com/joaocarvalhoopen/Most_common_components_in_electronicsHow to learn modernEmbedded Systemshttps://github.com/joaocarvalhoopen/How_to_learn_modern_Embedded_SystemsSimple notes on theCProgramming Languagehttps://github.com/joaocarvalhoopen/Simple_notes_on_the_C_Programming_LanguageHow to learn modernC++https://github.com/joaocarvalhoopen/How_to_learn_modern_C_Plus_PlusHow to learn modernRusthttps://github.com/joaocarvalhoopen/How_to_learn_modern_RustHow to learn modernJavascripthttps://github.com/joaocarvalhoopen/How_to_learn_modern_JavascriptHow to learn modernPythonhttps://github.com/joaocarvalhoopen/How_to_learn_modern_PythonHow to learn modernMachine Learninghttps://github.com/joaocarvalhoopen/How_to_learn_modern_Machine_LearningHow to Learn ModernAeronautics and Astronauticshttps://github.com/joaocarvalhoopen/How_to_Learn_Modern_Aeronautics_and_AstronauticsThank you,Best regards,João

author: GlennSprigg
author_rank: Super Contributor
timestamp: January 20, 2021, 01:18:02 pm
content: Thank you for your contribution. Although there are countless resources for such topics, a lot of themare very in-depth and not always user-friendly. You've done a good job...

author: Joao Carvalho
author_rank: Contributor
timestamp: January 20, 2021, 08:44:57 pm
content: Thank you for your comment GlennSprigg.Best regards,João

author: Joao Carvalho
author_rank: Contributor
timestamp: March 07, 2021, 05:00:43 pm
content: Hello,I have made one more guide:How to learn modernLinuxhttps://github.com/joaocarvalhoopen/How_to_learn_modern_LinuxYou can find all my guides in here:All my guideson Linux - Programming - Embedded - Electronics - Aeronauticshttps://github.com/joaocarvalhoopen/Guides_Linux-Programming-Electronics-AeronauticsBest regards,João

author: RJSV
author_rank: Super Contributor
timestamp: March 08, 2021, 12:32:56 am
content: NICE!I already see a couple of links I want to study
Surrealistic Keyboard - Page 1
Forum section: electronics / general

author: calzap
author_rank: Frequent Contributor
timestamp: March 06, 2021, 04:40:10 pm
content: Our media computer and big screen TV are in our living room near the woodstove. When I’m doing ripping and transcoding, I use the keyboard in my lap. But will sometimes set it on the woodstove if I’m interrupted. The woodstove is usually not in action at night. When I finish with the computer, I put the keyboard in an adjacent room … until last night.Yup, lit the already-laid-in fire this morning without noticing the keyboard. Before long, I was smelling eau-de-ABS. See the pics. Removed what I could get off quickly. Fortunately, we have a whole house fan; so opened windows and switched it on. A bit chilly though. Smoke alarms and CO alarms found it exciting for a while. Scraped the remaining melted ABS off the stove with a putty knife.Think the warranty will cover it?New rule: put nothing on the woodstove … ever.Mike in California

author: DiTBho
author_rank: Super Contributor
timestamp: March 06, 2021, 04:49:01 pm
content: Pop art

author: Cyberdragon
author_rank: Super Contributor
timestamp: March 06, 2021, 04:57:55 pm
content: Quote from: DiTBho on March 06, 2021, 04:49:01 pmDahli painting.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 06, 2021, 06:23:13 pm
content: Checks out.
Electronics references where you did not expect to see it. - Page 1
Forum section: electronics / general

author: aargee
author_rank: Frequent Contributor
timestamp: March 06, 2021, 05:09:09 am
content: Walking around Brisbane City... this on Edison Lane.This lane used to lead to the PMG/Telecom technical training school in years gone by.https://maps.app.goo.gl/kK7VZEvgkqb2ro9a9]Edison Lnhttps://maps.app.goo.gl/kK7VZEvgkqb2ro9a9

author: Cubdriver
author_rank: Unknown
timestamp: March 06, 2021, 07:24:18 am
content: B batteries with two positive terminals. Interesting. Wonder which end the electrons come out of?(Other than that, very cool.)-Pat
Soviet Mainframes - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: February 17, 2021, 01:19:27 pm
content: Interesting video on early Soviet mainframe computers.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 02, 2021, 01:37:45 pm
content: Looks like an IBM rip-off. Not that the Soviets ever did that kind of thing. Just saying.

author: Vovk_Z
author_rank: Super Contributor
timestamp: March 04, 2021, 07:40:02 pm
content: At 1:04 (2:40) it is something likeSaratov (Saratov-2). It is a PDP-8/PDP-11 clone.At 7:20 it is ES1052 - a IBM System/360, IBM System/370 clone.

author: coppercone2
author_rank: Super Contributor
timestamp: March 05, 2021, 09:16:35 pm
content: but does it play tetris?

author: daqq
author_rank: Super Contributor
timestamp: March 05, 2021, 09:44:57 pm
content: Quote from: coppercone2 on March 05, 2021, 09:16:35 pmYes, but you have to have some very strong assistants to move and rotate the racks.
Spectrum Analyzer - Page 1
Forum section: electronics / general

author: Eaglepride82
author_rank: Newbie
timestamp: March 04, 2021, 06:30:09 pm
content: I have an old Spectrum Analyzer (HP8591EM - EMC ANALYZER) and I would like to Measure the Amplitude and Frequency (Sound Level) of audiable noise that is present from coil whine of a common mode inductor. Basically, is there an easy way to connect a microphone to a spectrum analyzer? Is there a simple preamp circuit than can be used with the microphone? The purpose for these measurements are to demonstrate different dampening techniques and record sound level reductions.

author: bob91343
author_rank: Super Contributor
timestamp: March 04, 2021, 07:49:41 pm
content: That spectrum analyzer probably isn't suitable. It doesn't have the required frequency resolution to analyze audio signals.I have a similar model 8594L and its best resolution is 300 Hz and not too good there at that.

author: Eaglepride82
author_rank: Newbie
timestamp: March 04, 2021, 08:26:28 pm
content: OK. THanks. This analyzer will scan 9kHz to 1.8GHz. I was hoping I could put it in continuous sweep mode and scan the range from 15kHz to 20kHz.

author: TimFox
author_rank: Super Contributor
timestamp: March 04, 2021, 08:43:11 pm
content: For audio purposes, the 9 kHz lower bound on typical SAs is a nuisance. Within the range of your unit, you could use a preamplifier after a reasonable microphone. In my collection, I have an -hp- 465A and two PARs: 113 and 117/114.The 465A has a fixed bandwidth (covering audio up to about 1 MHz), a high-Z single-ended input, and can drive 50 ohms.The two PARs have high-Z differential inputs and selectable hp and lp filters. The 113 has a 600 ohm output (needs a pad to drive 50 ohms neatly), while the 117/114 combination can drive 50 ohms. I don’t offhand know the modern equivalents.

author: daqq
author_rank: Super Contributor
timestamp: March 04, 2021, 09:31:43 pm
content: Unless there's something weird going on you should be able to pull it off with an oscilloscope + simple preamplifier.

author: Eaglepride82
author_rank: Newbie
timestamp: March 04, 2021, 09:32:06 pm
content: Thanks Tim. I have access to a few older preamps, all HP - 465A, 8447C, and 8447A. I will have to look up the operating ranges for them.

author: Eaglepride82
author_rank: Newbie
timestamp: March 04, 2021, 09:35:54 pm
content: Thanks Daqq. I found a schematic to connect a Condenser mic with a LF353N circuit to couple to a scope with a 10uF cap.

author: fourfathom
author_rank: Super Contributor
timestamp: March 04, 2021, 09:52:34 pm
content: You can do this type of analysis on a PC. For example, take a look at Spectrum Lab, and Audacity. Both of these have FFT and other audio analysis capabilities.
Preserving The Last Analog Motion Graphics Machine - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: March 04, 2021, 03:10:10 am
content: Wiki -https://en.wikipedia.org/wiki/Scanimate

author: Halcyon
author_rank: Unknown
timestamp: March 04, 2021, 03:32:07 am
content: See existing thread here:https://www.eevblog.com/forum/chat/an-analog-motion-graphics-image-processor-for-tv/
SpaceX SN10 just landed successfully. - Page 1
Forum section: electronics / general

author: rdl
author_rank: Super Contributor
timestamp: March 03, 2021, 11:24:09 pm
content: It's leaning a bit and there's some flames, but it looks good so far.And then it blew up.

author: Stray Electron
author_rank: Super Contributor
timestamp: March 04, 2021, 02:12:41 am
content: 8 minutes later it took off again. In ALL directions!
Reliable salary database? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 12, 2021, 03:38:12 pm
content: Does anyone know of a reliable source of pay data for Canada? So far it seems like I've been looking at10 PRINT RANDOM($)20 GOTO 10all morning.

author: Brumby
author_rank: Unknown
timestamp: March 15, 2021, 12:02:02 am
content: Canadian bureau of statistics?https://www150.statcan.gc.ca/n1/en/type/data?subject_levels=11(apparently unavailable at time of this post due to maintenance)

author: ajb
author_rank: Super Contributor
timestamp: March 15, 2021, 03:44:49 pm
content: Glassdoor? IIRC they want you to contribute data before they show you too much--which makes sense, they have to get their data from somewhere--and not sure how easy it will be to filter out the data you're looking for. It may also bias high, since people who make piles of money are more likely to want to brag about it, but that's a common factor in any self-report database.
GFCI and pressure washer - Page 1
Forum section: electronics / general

author: rccola777
author_rank: Newbie
timestamp: March 02, 2021, 05:17:01 pm
content: Here's the story. I have a low-end Ryobi pressure washer with a GFCI module built in to the end of the cord where it plugs in. Unit quit working and I determined the GFCI was bad and replaced with a new one. All is good, but after installing the new GFCI, it made me ponder something. There was no ground wire going from the GFCI to the pressure washer, just hot and neutral. My understanding of how GFCI works is that current has to flow between ground and hot in order to trip it. Am I missing something?

author: Monkeh
author_rank: Super Contributor
timestamp: March 02, 2021, 05:38:32 pm
content: Quote from: rccola777 on March 02, 2021, 05:17:01 pmYour understanding is more or less correct but leading you to the wrong conclusion.GFCIs operate when the current flowing in line and neutral is not equal, which means it's taking a different path back to the source. This could be the ground wire, the neutral (or line) of another circuit, or anything adequately conductive in contact with the literal ground (like a person). No actual ground wire is needed for that.

author: Gregg
author_rank: Super Contributor
timestamp: March 02, 2021, 05:44:25 pm
content: The GFCI only senses imbalance between the line and neutral conductors to the device. If a ground were provided, the GFCI would not connect to that ground in any way.Think of what happens if you put a clamp meter around both the line and neutral of a device drawing current….the two should cancel and the clamp meter should read nothing if everything is working properly.However if there is any leakage of current downstream of the GFCI, it should sense that via the imbalance and trip the power at a pre set parameter

author: rccola777
author_rank: Newbie
timestamp: March 02, 2021, 05:55:29 pm
content: Thanks all, that makes sense now.
FCC testing required? - Page 1
Forum section: electronics / general

author: golf32
author_rank: Regular Contributor
timestamp: March 01, 2021, 11:33:52 pm
content: Hi, I'm a new engineer and I've been contracted to design a product for a client. It's a simple micro-controller board for storm water management, nothing crazy. I've been reading into FCC regulations for selling products, and I believe I need to have compliance testing done.Here are some relevant details:24v input, powered either by a solar system or off the shelf mains converteroptional cellular module (external unit, already certified)8MHz microcontrollerMy client is a contractor and plans to install these as part of a system inside of a cabinet, and also wants the option to sell the individual boards later.Sorry if this has been asked a million times, this sort of thing can be stressful.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 02, 2021, 12:14:10 am
content: Quotehttps://www.fcc.gov/oet/ea/rfdevicehttps://www.ecfr.gov/cgi-bin/text-idx?SID=c7be03a4f7b02514cea89421fc363794&mc=true&tpl=/ecfrbrowse/Title47/47cfr15_main_02.tplThere are some interesting exemptions:https://www.ecfr.gov/cgi-bin/text-idx?SID=039215141eb74469b249fbbe7bbef744&mc=true&node=se47.1.15_1103&rgn=div8

author: golf32
author_rank: Regular Contributor
timestamp: March 02, 2021, 12:22:57 am
content: Thanks for the reply.I've read through those documents, and unfortunately I don't think my device falls under any of the exemptions.Just wanted to make 100% sure.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 02, 2021, 12:48:19 am
content: Hmm, I wonder if there's scope for exemption in this depending on your client's target customers:QuoteIs this device similar to anything else on the market? If so, does they have FCCIDs?

author: golf32
author_rank: Regular Contributor
timestamp: March 02, 2021, 01:59:16 am
content: This design is a replacement for something he had someone else make. From what I've been told I wouldn't be surprised if it wasn't tested, but that is a good lead. Thanks for all the help.

author: gnuarm
author_rank: Super Contributor
timestamp: March 02, 2021, 05:34:28 am
content: EMC testing is a big deal. However, it isn't done at the board level. What matters is the system level, the box. So if your customer is selling or using them in a system in a cabinet, it is up to him to have the unit tested. It's not unusual to have noisy boards meet FCC or IEC requirements once enclosed in an EMC tight box. Every cable in and out has to be filtered along with any controls, displays, etc.It's not too hard to design simple stuff that meets specs, but the testing is not cheap and if you need to fix and retest, it costs again, and again...What is on your board?
Let me share with you the tone and working voltage of OP - Page 1
Forum section: electronics / general

author: dob
author_rank: Newbie
timestamp: March 09, 2021, 03:25:22 am
content: Let me share with you the tone and working voltage of the OPThe Op-Amp of the AD series has a brighter sound in the high-frequency range, quick response, and surging momentum.The Op-Amp of the OPA series has a warm tone, all frequency bands are even, especially string music is even better.49720HA: Less music, less warmth, low noise, and affordable price. I definitely want to buy two128SM: Bright mid-range, good extensibility of treble, slightly less bass, insufficient sense of space, but the warmer sense of music. The vocals are first-class, but the shortcomings are low noise and big noise627SM: The mid-frequency is not as bright as 128sm, but it is still good. The high and low frequencies are fast and accurate. The sense of space is strong. Low noise is low. It is suitable for listening to rock, pop, and metal, but the shortcomings lack emotion in a human voice.I have heard of 627SM, 128SM is tight, and both of them are top OPA, but my comments are different.The sound of the 627SM is very delicate, the sound is faster, and the low-frequency quality is better.128SM sound is more delicate, clear sound is slower, warmer, high, medium, low, very balanced, (I think the sound of the recent tube amplifier)The sound of LME49720HA is cold, light, crisp, and fast. The musical sense is first-rate but the vocal feelings are not good.NE5532 has many different sounds. The modern and cheap NE5532 pottery seals have different sounds from the ancient Philip NE5532 pottery seals (Philip’s is thicker, but the explanation is not strong). NE5532 is just a name, and every factory produces it. The sound is slightly different.Another wild and cheap Op-Amp is JRC4580, which is also a wild Op-Amp that won't be wailing but not too loud.Edited by moderator: Removed spam link.AD8599/AD8610, etc. are relatively unmodified, straight-out, and straight-in. As a result, there are very few requirements for wiring and accessories, but they are definitely better than BB when done well. I think that if you change the capacitors (and you need to know the tuning by the teacher), you can try AD products, otherwise, the performance of these AD's high-priced Op-Amps will not be brightened by changing the OPAMP alone.

author: Nominal Animal
author_rank: Super Contributor
timestamp: March 09, 2021, 03:57:18 am
content: What about the taste, though?I think AD series has more of an epoxy-like taste, whereas OPA series tastes more like ABS. The leads on both gives a nice zesty metallic zing, although I warmly recommend avoiding tasting used opamps, as many fluxes leave a toluene-like chemical aftertaste that may be difficult to forget.I haven't yet made a true pro tongue-board for licking opamps in combination to get true gastronomic explosions of combined tastes, but that's my next project.For true connoisseurs, the opamps should be powered when tasted, although for hobbyists, it can be difficult to appreciate the nuances then.
Multitech EPB-MPF-IBP EPROM Programmer for MPF-IP - Page 1
Forum section: electronics / general

author: Loor$
author_rank: Newbie
timestamp: March 01, 2021, 08:25:14 pm
content: Hi everyone.I'm new to the forum and wasn't sure where to place this question, so i am looking for the user and service manual of the Multitech EPB-MPF-IBP EPROM Programmer for MPF-IP Micro-Professor, i looked on the manufacturer's websitewww.flite.co.ukbut found nothing, i found only manuals for a different version.can someone help me ?thanks very much
Wow this electron conspiracy goes back a long time! - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 01, 2021, 07:05:17 pm
content: I never thought to look up the Coolidge tube but this is amazing stuff. I like the honeycomb target, from 1931, it looks like a piece of a warp drive.Dude lived a long time too.https://en.wikipedia.org/wiki/William_D._Coolidge

author: Terry Bites
author_rank: Super Contributor
timestamp: March 02, 2021, 01:34:55 pm
content: It's gone on far too long. This balls whizzing about thing is an idea is a dodo even at CERN.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 02, 2021, 02:07:56 pm
content: I can guarantee that when they build simple electronic circuits at CERN, they general think in terms of current flow. I doubt that they consider putting resistors in series, for example, changes the probability of wave function collapse.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: March 02, 2021, 02:11:34 pm
content: Quote from: Terry Bites on March 02, 2021, 01:34:55 pmHuh?
Keysight contest - share your bench, get goodies! - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: February 19, 2021, 09:07:34 pm
content: The title says it all, 6x 2500 USD worth of gear for the winners.https://www.keysightbenchchallenge.com/?cmpid=OSM-501781&utm_source=ADOSFB&utm_medium=OS&utm_campaign=108Quote

author: purfield
author_rank: Regular Contributor
timestamp: February 22, 2021, 03:07:26 am
content: Interesting, looks like they're teasing some unreleased products in this contest promo. With the exception of the scope, I think the other instruments shown haven't been released yet.

author: floobydust
author_rank: Super Contributor
timestamp: February 27, 2021, 04:32:01 am
content: I wonder if this legendary workbench would even be considered today.

author: bsfeechannel
author_rank: Super Contributor
timestamp: February 27, 2021, 09:46:52 pm
content: Quote from: daqq on February 19, 2021, 09:07:34 pmI have a hacked Rigol DS1052E, a Victor VC-97 digital meter, a homemade power supply and a homemade audio oscillator.That'll dazzle them.

author: Refrigerator
author_rank: Super Contributor
timestamp: February 28, 2021, 12:22:13 pm
content: The only thing i could dazzle them with would be the significant lack of equipment on my benchI guess i should clean my bench up and snap some pics for a chance to win
WD40 tip on CNN ad.. - Page 1
Forum section: electronics / general

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: February 26, 2021, 03:38:52 pm
content: No.no.no...Don't now how many WD40 sprayed consumer electronics I had on my bench over the years, but many!

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: February 26, 2021, 04:05:52 pm
content: This post probably belongs in the Dodgy Technology forum. It's a natural for that one.

author: Stray Electron
author_rank: Super Contributor
timestamp: February 27, 2021, 03:43:19 am
content: Just add this to the lists of reasons why I don't believe anything that appears on CNN!

author: DrG
author_rank: Super Contributor
timestamp: February 27, 2021, 04:17:52 am
content: Some prefer toothpasteLooks to me like it is a common click bait advert that you see on many sites..."Paid Partner Content"https://www.google.com/imgres?imgurl=https%3A%2F%2Fi.ytimg.com%2Fvi%2F9ehJJn_peY0%2Fmaxresdefault.jpg&imgrefurl=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9ehJJn_peY0&tbnid=VGLIRsRUlFrNKM&vet=12ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygBegUIARCpAQ..i&docid=k5NbSxjKW8yK3M&w=1280&h=720&q=wd40%20cracked%20phone%20screen&client=firefox-b-1-d&ved=2ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygBegUIARCpAQhttps://www.google.com/imgres?imgurl=https%3A%2F%2Fi.pinimg.com%2F474x%2Ff7%2Ff0%2Ff8%2Ff7f0f889cc3bf6058688ed7b7851e202.jpg&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F477240891756092264%2F&tbnid=Xn2gIEeg_3dHiM&vet=12ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygGegUIARC1AQ..i&docid=E0QQSvzqCff3EM&w=474&h=266&q=wd40%20cracked%20phone%20screen&client=firefox-b-1-d&ved=2ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygGegUIARC1AQhttps://www.google.com/imgres?imgurl=https%3A%2F%2Fd1tofjskaookh9.cloudfront.net%2Fwp-content%2Fuploads%2F2018%2F08%2F02170314%2FiPiccy-collage3.jpg&imgrefurl=https%3A%2F%2Fwww.drivepedia.com%2Ftrending%2Fuse-wd-40-fb%2F&tbnid=cPWqf77p4hiHeM&vet=12ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygKegUIARC-AQ..i&docid=4kNtZ4Frsjm9dM&w=1000&h=1000&q=wd40%20cracked%20phone%20screen&client=firefox-b-1-d&ved=2ahUKEwi5_ejRmYnvAhV6g3IEHTk6CFcQMygKegUIARC-AQ
What's with all the "ShopNNNNNN Store" on Aliexpress? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: February 26, 2021, 10:14:48 am
content: Some years ago the Aliexpress shops use to have names made out of words. Now many of the shops have the same name format, "ShopNNNNNN Store", where only the number differs. Looks to me like they are made by a bot.Anybody bought from shops named "ShopNNNNNN Store" recently, are they OK?

author: CJay
author_rank: Super Contributor
timestamp: February 26, 2021, 10:29:50 am
content: I guess the names are auto generated by Ali when you sign up, a bit like Twitter or various other 'providers' might suggest RoGeorge795432 unless you can suggest something unique.I have bought from a couple and had no problems but obviously that's not any kind of guarantee they're all good.
Sonificaiton of astrophotograhs. - Page 1
Forum section: electronics / general

author: hamster_nz
author_rank: Super Contributor
timestamp: February 24, 2021, 08:59:22 pm
content: Astrophotography converted to sound:Minimal value, but pretty neat anyway.

author: coppercone2
author_rank: Super Contributor
timestamp: February 24, 2021, 11:45:30 pm
content: i swear those are the noises from 2001 a space odyssey on video #2is it almost better with pink floyd? yes
"Timer/Generator Circuits Manual", missing pages - Page 1
Forum section: electronics / general

author: MikeK
author_rank: Super Contributor
timestamp: February 18, 2021, 06:46:36 pm
content: I got a copy of this recently and it looks like a bad printing; there are 16 pages that are blank. Would anyone have a copy they could scan the missing pages?Timer/Generator Circuits Manual, by R.M. Marston1990Blank pages: 58,59,62,63,66,67,70,71,74,75,78,79,82,83,86,87-Mike

author: lowimpedance
author_rank: Super Contributor
timestamp: February 23, 2021, 12:08:52 am
content: Quote from: MikeK on February 18, 2021, 06:46:36 pmScans of the requested pages. note the last page set orientation was stuffed up hence the extra PDF !.

author: MikeK
author_rank: Super Contributor
timestamp: February 23, 2021, 12:16:24 am
content: Thanks very much, mate!
Local Oscillator of FM Radio - Page 1
Forum section: electronics / general

author: Scr1bbl3
author_rank: Contributor
timestamp: February 22, 2021, 03:36:55 am
content: Hi all,This is the local oscillator in an FM radio I found. I understand the tank circuit, C10 and C11 function, and biasing. Does anyone know the purpose of C7 and C9? Feedback perhaps but why would you use the 9V power line for the input to output connections?thanks, scribs

author: bsfeechannel
author_rank: Super Contributor
timestamp: February 22, 2021, 04:27:11 am
content: Quote from: Scr1bbl3 on February 22, 2021, 03:36:55 amDo I have to log in?

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 22, 2021, 03:29:01 pm
content: The owner of this album has set this album to private.

author: Zero999
author_rank: Super Contributor
timestamp: February 22, 2021, 06:09:24 pm
content: Quote from: Scr1bbl3 on February 22, 2021, 03:36:55 amPlease attach the schematic to a post, rather than using an external image hosting site. In the past we've had problems with hosting sites deleting images, so the thread no longer makes sense.When you're editing the post, clickAttachments and other optionsto attach the image to the post.

author: bsfeechannel
author_rank: Super Contributor
timestamp: February 22, 2021, 10:50:00 pm
content: Quote from: Scr1bbl3 on February 22, 2021, 03:36:55 amNow we're talking. This is a Colpitts oscillator. C9 is part of its feedback loop and C7 is decoupling the base of the transistor.
Sourcing 100W solar panels - Page 1
Forum section: electronics / general

author: oliver602
author_rank: Regular Contributor
timestamp: February 18, 2021, 10:10:20 pm
content: Hi all,I have 78 cm X 183 cm space available for solar panels on a camper. I would like to fit 200 W.I'm having trouble finding panels to make the most of the space available.I initially found these 100 W panels that I could fit two of. But they are out of stock and quite expensive(?) at £139/$194 each.https://www.photonicuniverse.com/en/catalog/full/21-100W-12V-solar-panel-with-5m-cable-German-solar-cells.htmlI did some searching on ebay and found these panels of similar dimensions and power at almost half the cost.https://www.ebay.co.uk/itm/100W-100-Watt-Solar-Panel-Module-Folding-Strut-Controller-Fast-Battery-Charger/402137838557My question is, would you trust the seller on the specifications and construction quality of these panels?

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 19, 2021, 04:30:13 am
content: Can you find a single panel around 200W of that dimension? 100W is no longer the "sweet spot" for lowest cost in small quantity.

author: tautech
author_rank: Super Contributor
timestamp: February 19, 2021, 07:37:24 am
content: Quote from: oliver602 on February 18, 2021, 10:10:20 pmShift something to fit a 325W panel.https://www.ebay.com.au/itm/12V-325W-Solar-Panel-325-Watt-Mono-Caravan-Camping-Home-Battery-Charging-Power/153356517959

author: oliver602
author_rank: Regular Contributor
timestamp: February 21, 2021, 02:23:39 pm
content: I found a215W solar panelfrom Victron thats 80.8cm wide. I re measured and decided I could hopefully get away with a 81cm wide panel with some custom brackets.
Anti-static Heat Resistant plastics/resins? - Page 1
Forum section: electronics / general

author: Turatron
author_rank: Newbie
timestamp: February 22, 2021, 08:20:53 pm
content: Hi guys ,sorry If I'm posting this in the wrong board (I'm new) , I couldn't really see where else would be appropriate to post,but anyway the situation is that I've got hold of an old server and gotten most of it working but the one thing missing to get it running properly isthe cooling baffles that direct air into the tiny heat-sinks and RAM slots.This wouldn't be as big of an issue if the OEM parts weren't as rare as hen's teeth and the few out there cost $80AUS and that's not even for the full set whichthe other piece(s) seem non-existent outside of the service manual.Before throwing out the unusable crap of a smashed Samsung LCD widescreen TV I found on the side of the road, I saved the back-light filters (idk) and I was wondering whether I could use them to jerry-rig a stop-gap solution for cooling the server until I find the OEM parts at a non-ridiculous price of almost twice what I paid for it.Any advice/ suggestions are welcome.Ta
Mystery IC - Page 1
Forum section: electronics / general

author: Arek_R
author_rank: Regular Contributor
timestamp: February 18, 2021, 03:10:14 pm
content: Hi, I'm doing "research for educational purposes" on a inductive sensor.There was one IC covered in hard black potting that I removed with acetone.Unfortunately I cannot find any matches on google for the markings.It's most definitely driving the coil.Has anyone any clue what's the part number of this IC?

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: February 18, 2021, 04:11:17 pm
content: Possibly a custom ASIC manufactured by HMThttps://www.hmt.ch/robust_asics/
Tact Switch Low Temp High Humidity Failures - Page 1
Forum section: electronics / general

author: jpop
author_rank: Newbie
timestamp: February 19, 2021, 02:56:55 pm
content: Hello all,I am a newbie, so I apologies if anything I say doesn't make sense or if I am not providing the right information. I am basically asking for advice or where to look for more information. Or if you know what the issue is and how to help that would be greatly appreciated.Basic background:We use tact switches to operate a product(open switch and closed switch) that is on a vehicle.The switches are encased in a plastic housing, but the housing has direct contact to the outside elements. Both switches are on the same board. It is an open circuit using 10v regulated by an ECU. When pressed the circuit is closed and the product operates.Issue:We have had issues in which the product begins to operate by itself or doesn't work. At first we suspected the ECU, but then we checked the resistance at the connection points of the tact switch where it connects to another loom. We found that there was resistance present. We then checked a new working product and found no resistance. So we concluded that if there is resistance the product won't work.We suspect that moisture could be getting into the tact switch causing a false contact. We have spoken to the supplier and they fully enclose the switch and use potting to close all gaps on the circuit board and in and around the tact switch.We suspect, that given the temperature conditions, low temperature (-4-10 degrees celsius) and high humidity (80-95%) that there could be a dew point being reached and initiating moisture on the tact switch contact. But we don't really know.Assistance:Has any one had issue with tact switches, if they have what type of failures and what was done to fix the issue. What test can you do to verify if it is moisture or condensation is present? Any pieces of advice would be great.Cheers,J

author: wraper
author_rank: Unknown
timestamp: February 19, 2021, 03:09:03 pm
content: There are silver dendrites growing between contacts in switches. Lower resistance pull-up will increase reliability as it prevents failure when switches start to conduct. However it would be the best to use switches with gold plated contacts to really fix the issue.

author: tom66
author_rank: Super Contributor
timestamp: February 19, 2021, 03:31:46 pm
content: One 'trick' I picked up from our switch supplier (we do a lot of Hi-Rel stuff) is to put a small capacitor on the output of the switch and a resistor in the ground path of the switch, assuming it is switching on the low side with a pull up. The capacitor will pass a wetting current through the switch on every activation cycle, which may help keep the switch contacts clean. The resistor in the ground path limits this current so it does not cause pitting or arcing of the contacts.
datasheet and information about 6c17504 and 1d17409 8pin ic - Page 1
Forum section: electronics / general

author: esinior
author_rank: Contributor
timestamp: February 15, 2021, 07:19:29 pm
content: hi , i have a power supply of epson eb-x41 projector that doesn't turn on . i haven't found the problem yet but in the power supply circuit it has 2 ics that i couldn't find any datasheet or just a little data about them, i think they should be switching ics but it's so strange for me why there is no data about them?!

author: amyk
author_rank: Super Contributor
timestamp: February 16, 2021, 05:47:38 am
content: That's because they're not 6c17504 nor 1d17409, but a FA8A01 (which isthe same as FA5643/FA5641according to some nice Russians) and FA5612.
502 error - Page 1
Forum section: electronics / general

author: jmelson
author_rank: Super Contributor
timestamp: February 15, 2021, 12:41:38 am
content: Not sure where to report these, now, there used to be a specific forum for it.I'm getting consistent 502 errors on the Manufacturing and Assembly forum. All others work fine. I did clear my cache.Thanks,Jon

author: RoGeorge
author_rank: Super Contributor
timestamp: February 15, 2021, 12:55:44 am
content: Maybe in thehttps://www.eevblog.com/forum/chat/website-error-reports/

author: jmelson
author_rank: Super Contributor
timestamp: February 15, 2021, 03:55:56 pm
content: Just trying to get somebody's attention. A number of users report that :Manufacturing and AssemblyRF Microwave Ham RadioOther Equipment and ProductsBeginners is now doing the 502 error, tooall get the 502 "bad gateway" error page. Can somebody please look into this, it has been going on for at least a whole day, now.Interestingly, I CAN see the "last post" in that forum through the last post link on the right of the main forum menu page, but get the 502 when trying to see the whole forum. Maybe that is a hint?Thanks,Jon

author: Benta
author_rank: Super Contributor
timestamp: February 15, 2021, 09:50:19 pm
content: Yeah, completely unstable.I keep getting logged off as well.

author: Miti
author_rank: Super Contributor
timestamp: February 15, 2021, 10:03:34 pm
content: I missed that somebody already raised this issue. Can a moderator delete my post?
RF, Microwave, Ham Radio board - 502 Bad Gateway - Page 1
Forum section: electronics / general

author: Miti
author_rank: Super Contributor
timestamp: February 15, 2021, 09:07:00 pm
content: Since this morning I get "502 Bad Gateway" only when I click on the RF, Microwave, Ham Radio link. Do you see the same thing?

author: ZigmundRat
author_rank: Regular Contributor
timestamp: February 16, 2021, 04:43:35 am
content: Yup. Same for me right now.

author: johnh
author_rank: Regular Contributor
timestamp: February 16, 2021, 05:05:47 am
content: Still happening
MOVED: When a DIMM RAM stick gets cost-optimized just that little bit too far? - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: February 18, 2021, 08:38:25 am
content: This topic has been moved toGeneral Computing.https://www.eevblog.com/forum/index.php?topic=270752.0
MOVED: What was the internet like in 1989, heres a reproduction you can navigate! - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: February 13, 2021, 07:38:53 am
content: This topic has been moved toVintage Computing.https://www.eevblog.com/forum/index.php?topic=269946.0
G12/G18 Wall Mounted Tube Clamp NTC, from China. Anyone experience? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: February 12, 2021, 06:22:16 pm
content: Hi All,Looking for some (copper) pipe NTC, these look ok. But with long shipping times (~ 6 weeks). Not sure if this is worth it?These go under the name "G12 G18 10K 50K Wall Mounted Tube Clamp Type NTC Temperature Sensor", but couldn't find any datasheet/info .So anyone tried these? Any other simple NTC "snap-on" clips to keep track of pipes ?Thanks!

author: floobydust
author_rank: Super Contributor
timestamp: February 12, 2021, 07:00:10 pm
content: You don't use these for controlling heaters, they fall off the pipe!I think these are just for testing and temporary use. Good heat transfer assumes the metal face is right on the pipe. Industry uses a metal SS tie-wrap or hose clamp (for safety) with an encapsulated temperature probe to mount it. Iron in contact with copper does cause electrolysis and will corrode the pipe with age.The pic shows B=3535 1% 10k@25C which is popular for somewhat lower water temps. I find the low cost chinese thermistors are not great for accuracy, quality varies a lot and they don't last long with their epoxy dip. A glass (diode) package thermistor has longer life, it depends on what temperatures they will see.

author: onesixright
author_rank: Frequent Contributor
timestamp: February 12, 2021, 07:13:28 pm
content: Quote from: floobydust on February 12, 2021, 07:00:10 pmAha, thanks! Always good to ask hereSO a SS tie-wrap (makes sense).Tubes will be between ~ 0-100C, nothing fancy. Any ideas what NTC to use?
Wise words from NorthridgeFIX. Worth watching his video - Page 1
Forum section: electronics / general

author: Fraser
author_rank: Super Contributor
timestamp: February 11, 2021, 12:59:37 pm
content: Some wise words from NorthridgeFIX on writing harsh or insulting comments on VBlog feedback or forum posts.....https://youtu.be/eegG9dFSmuo
Radio frequency Saturation - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: February 10, 2021, 11:31:31 am
content: wireless everything, can we have too much of a good thing?got a printer the other day , and yes it has wireless like everything else electronic.is there a limit to how much radio spectrum saturation is tolerable?it would be interesting to know.https://www.forbes.com/sites/forbestechcouncil/2020/02/10/5-wireless-iot-communication-trends-to-watch-in-2020/?sh=23d933255608https://www.technewsworld.com/story/86385.html

author: bob91343
author_rank: Super Contributor
timestamp: February 10, 2021, 11:29:57 pm
content: No limit other than technology.
Search function returns (many) irrelevant hits. - Page 1
Forum section: electronics / general

author: Jwalling
author_rank: Unknown
timestamp: February 10, 2021, 01:04:36 pm
content: Doing a search for 156-7645-00 (A Tek part #) yields nothing but irrelevant hits.Am I doing something wrong? Tried "156-7645-00" as well, but I got the same result.

author: grumpydoc
author_rank: Super Contributor
timestamp: February 10, 2021, 01:12:10 pm
content: Use Google advanced search specifying the forum site - the forum search has never been brilliant.
The ultimate answer to internet trolls? - Internet Goats! - Page 1
Forum section: electronics / general

author: Gyro
author_rank: Super Contributor
timestamp: February 09, 2021, 10:50:24 am
content: For those familiar with the story of 'The Three Billy-Goats Gruff'.This could be the ultimate answer to Internet trolls - Internet Goats for hire!Quote...https://www.bbc.co.uk/news/uk-england-lancashire-55887368https://entertainment.ie/trending/goat-zoom-meeting-473404/

author: penfold
author_rank: Frequent Contributor
timestamp: February 09, 2021, 12:06:36 pm
content: QuoteAnd to think Lancashire folk have a reputation for being odd

author: Nominal Animal
author_rank: Super Contributor
timestamp: February 10, 2021, 12:35:24 am
content: I for one will not look atanythingthat purports to combine internet trolling and goatse.
Datasheet search - M54HC123FL or M54HCL23FL? - Page 1
Forum section: electronics / general

author: Toczek13
author_rank: Newbie
timestamp: February 12, 2021, 11:29:08 pm
content: Hello,I am looking for datasheet or any info about M54HC123FL/M54HCL23FL (I am not sure what is written on top ones or Ls) ic. I have extracted it from old spectrometer control rack and google wasn't helpfull at all. I would appriciate any help.

author: Andy Watson
author_rank: Super Contributor
timestamp: February 12, 2021, 11:58:03 pm
content: Do you have any clue as to what the device does?Long, long ago, the 74xx series of logic was available as 54xx, which was the military spec'd version. For example:https://www.ti.com/product/SN74123(download the datasheet)Edit: Possibly, the "M" indicates it is an ST device. The 54 indicates it is one of their "rad hardened" devices. - so it's possibly a rad-hardened 74HC123. Note, pin-outs are usually different between 54 and 74 series.https://www.st.com/resource/en/datasheet/m54hc123.pdf

author: Toczek13
author_rank: Newbie
timestamp: February 13, 2021, 12:09:26 am
content: It was close to bunch of 741NC op-amps and DAC (8 and 10 bits), the brand name of M54... ic is SGS I think.I made a photo of this IC.

author: Andy Watson
author_rank: Super Contributor
timestamp: February 13, 2021, 12:23:39 am
content: You didn't mention the SGSIt's an ancient ST device from the days when they were known as SGS Thomson:http://pdf.datasheetcatalog.com/datasheet/SGSThomsonMicroelectronics/mXvqrsx.pdf

author: Toczek13
author_rank: Newbie
timestamp: February 13, 2021, 12:28:44 am
content: Thank you!It's older than me

author: jmelson
author_rank: Super Contributor
timestamp: February 13, 2021, 06:42:16 pm
content: Quote from: Toczek13 on February 12, 2021, 11:29:08 pmYour subject line has a typo. The device is a military temperature grade dual one-shot, basically the 74HC123 in a ceramic glass-frit package.Look at the 74HC123 datasheet for function and pinout.Jon

author: amyk
author_rank: Super Contributor
timestamp: February 13, 2021, 11:13:23 pm
content: Quote from: Andy Watson on February 12, 2021, 11:58:03 pmWhat? AFAIK 54xx and 74xx have the same pinout but different temperature ranges.

author: srb1954
author_rank: Super Contributor
timestamp: February 14, 2021, 01:36:06 am
content: Quote from: amyk on February 13, 2021, 11:13:23 pmThe pin numbering is the same only for the DIP packages versions of the 54 and 74 series.The 54 series was also available in a flat-pack package which typically had different pin numbering to the DIP packages.

author: newbrain
author_rank: Super Contributor
timestamp: February 14, 2021, 09:43:12 am
content: Quote from: Andy Watson on February 13, 2021, 12:23:39 amEh, you might be right or slightly wrong depending on the date codee on that IC!Is it 1988 or 1986?Given the logo, I would go with1986, and at that time it was just SGS, as in Società Generale Semiconduttori, even before the fusion with Thomson!
Actual full length 44 min USSR military film of the compleate tzar bomba operati - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: February 06, 2021, 03:14:27 am
content: Much like the castle bravo and teapot series only the USSR version:https://youtu.be/XJhZ3i-HXS0

author: S. Petrukhin
author_rank: Super Contributor
timestamp: February 08, 2021, 02:55:44 pm
content: The film is very well crafted and colorized.I only saw it in the b/w version with a lot of noise.
DAJING ADP-36C2 - any good? - Page 1
Forum section: electronics / general

author: 0-8-15 User
author_rank: Regular Contributor
timestamp: February 10, 2021, 04:01:24 pm
content: I would like to hear some thoughts on the build quality of theDAJING ADP-36C2power supply.Would you consider using something like this 24/7?Is it possible to roughly estimate the efficiency of this type of power supply?
MC12080D  PRESCALER - Page 1
Forum section: electronics / general

author: johnh
author_rank: Regular Contributor
timestamp: February 09, 2021, 07:31:37 am
content: So what happened to MC12080D prescalar chips?Are they not being manufactured anymore. Can't seem to get them via the normal distributors.Findchips says Bristol Electronics or Quest Components have stock. Never dealt them beforeWhat are they like to deal with?Only want 3I can see that they are available on ebay and aliexpress.

author: Benta
author_rank: Super Contributor
timestamp: February 09, 2021, 12:30:40 pm
content: Most have been obsoleted from ON or Freescale.Lansdale Semiconductor have taken over production.http://www.lansdale.com/