hybridfree/eevblog-posts huggingface dataset:
Interesting History About WWII Mistake - Page 1
Forum section: electronics / general

author: mawyatt
author_rank: Super Contributor
timestamp: July 13, 2022, 04:24:02 pm
content: Intersting history!!https://thatsinsan.quora.com/https-www-quora-com-What-was-a-big-mistake-in-WW2-answer-Jonathan-Liu-55?ch=15&oid=55141873&share=afda996e&srid=uxRABb&target_type=postBest,

author: jonpaul
author_rank: Super Contributor
timestamp: July 13, 2022, 08:27:13 pm
content: At Bletchley Park our old friend Tony Sale did the reconstruction of Colossus,see original machine in the link.A massively parallel special purpose computer its speed was equivalent to a 1 MHz Pentium PC, achieved with 100s of valves and relaysColossus cracked the Lorentz keys in 20 minutes.Now at the National Museum of Computing near Bletchley Park in the UKJon

author: mawyatt
author_rank: Super Contributor
timestamp: July 14, 2022, 12:47:57 am
content: If you ever get to Washington DC, check out the Crypto Museum at Ft Meade, they have the Enigma, Lorentz and Japanese Equivalent "Purple" on display. It's open to the public. Just noted its temporarily closed.https://www.google.com/maps/place/National+Cryptologic+Museum/@39.1124587,-76.7666511,14.19z/data=!4m5!3m4!1s0x0:0xe8166ff5b9ca8a1c!8m2!3d39.1148288!4d-76.7747483Best,
another Chinese handheld Arc (stick) welder toy - mikeselectricstuff - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: June 24, 2022, 09:00:23 pm
content: hot snot gun for weldersnot handy, must use both hands to weld with itwelding sparks will get into vents and destroy it

author: BrokenYugo
author_rank: Super Contributor
timestamp: June 25, 2022, 05:41:59 am
content: It does seem to be a rather asinine repackaging of the little chinesium pocket welders. That big bulky thing is not what a good rod holder looks like, especially doing repair work, which is where the little welders come in handy.

author: Cubdriver
author_rank: Unknown
timestamp: June 25, 2022, 07:28:29 am
content: Wow, that thing looks sketchy AF!And I don't believe that duty cycle spec for even an instant - welder duty cycles are typically specified over ten minutes; eg a 15% duty cycle machine can weld at that rated current for a minute and 30 seconds out of every ten minutes. Seriously doubt that thing could run at 120 A for a full minute and a half. Yike!-Pat

author: coppercone2
author_rank: Super Contributor
timestamp: June 25, 2022, 08:46:37 am
content: I like the idea but the build quality would need to be superb for this to be a good idea. that is sketchy. technology is not there yet to make this viableone day its gonna be a 50$ mechanics tool like the high power soldering guns that we have now.
Winner Winner Chicken Dinner - Page 1
Forum section: electronics / general

author: austfox
author_rank: Regular Contributor
timestamp: June 26, 2022, 06:45:22 am
content: Opening up my box of Steggles and it looks like Dave's managed to get 'Chicken Dinner' back into everyday usage.I remember hearing it often growing up in the 80's, and then nothing until I started watching Dave's videos. I use it quite often nowadays.The question I'm pondering... which product might I see A Nun's Nasty mentioned?
The insane water requirements for modern IC chip fabs. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: June 24, 2022, 03:57:02 am
content: The insane water requirements for modern IC chip fabs.Every metric from the absolute purity to the quantity of water used per day is astounding.Enjoy the video:

author: Gyro
author_rank: Super Contributor
timestamp: June 24, 2022, 08:49:28 am
content: Some fabs, TSMC for instance, are doing something about it though...https://www.eevblog.com/forum/microcontrollers/tsmc-building-huge-water-treatment-plant/

author: Black Phoenix
author_rank: Super Contributor
timestamp: June 24, 2022, 10:16:51 am
content: Quote from: Gyro on June 24, 2022, 08:49:28 amNot only that but Environmental rules in Taiwan and Recycle ones are very strict an enforced by constant inspectors suprise visits, since Taiwan relies heavily on water from the mossons and typhoons for their own sustainability. That in Mainland would not work because of the latent corruption in every step of the ladder, and you can see by how the water quality is in the country, where most of the water is contaminated with heavy metals and improper to drink, and the tap water in cities like Guangzhou and Shenzhen are acceptable but need filtration nor boiling to be used in meal preparations.This year from what I know there wasn't yet a big typhoon to hit the South of China Sea, when normally there are at least 3 by now, but heavy rains had been happening, basically most of the month of May and June were heavy mossons in the Guangong Province. I don't know how it was in the Fujian province, in line with the Taiwan Island.
Using frequency generators to create and modulate carrier waves - Page 1
Forum section: electronics / general

author: altnergy
author_rank: Newbie
timestamp: June 22, 2022, 10:46:29 pm
content: Hello! I have several frequency generators DDS 60Mhz units.I know how to program sweeps and all the common stuff I want to do.What I want to know is EXACTLY how to CREATE a carrier wave, then modulate it. I have found DOZENS of videos etc. that explain the theory behind carrier waves and history etc. BUT NOBODY has yet explained something as simple as HOW to do the following.So I Am going to give a very simplified example of what I would like to learn how to do.In explaining this PLEASE show me or tell me EXACTLY what to connect to where and in order to make this happen.1) Create a 1MHz signal2) Modulate it with a 1KHz signalI have a sweep programmed in one unit that goes from 100Hz to 150MHz. I want to also modulate the 1MHz signal with that sweep.Thank you in advance for ANYONE who is willing to show me hot to do this. If TWO Signal Generators are required I do have identical Feeltech FY6900 units we can use for the learning experience!I have experience over the past several decades building medical equipment, and musical gear from component level electronic parts, synthesizers and such, etc. etc. etc. Also ran my own computer I.T. Business since 1995 with clients like Met Life, AMEX, FBI, U.S. Senate, BAnks, Airlines, Xerox, Kodak, etc.All this forum stuff is new to me and I admit not to quite understand it all and get distracted with so many options, emogies and such.So please any who can help me let us just respond with simple communication one mind to another. I follow instructions well and love to learn. Photos and diagrams are helpful.God bless and be well!

author: Benta
author_rank: Super Contributor
timestamp: June 22, 2022, 11:17:57 pm
content: Dunno what kind of modulation you want (AM, FM, PM...), but it seems the FY6900 can do it all by itself.Set CH1 to 1 MHz, and use CH2 for 1 kHz modulation.

author: TimFox
author_rank: Super Contributor
timestamp: June 22, 2022, 11:20:15 pm
content: The first question:Do you want to make a "DSB, suppressed carrier" output, or an"AM, with carrier" output when modulating the 1 MHz carrier with the 1 kHz "baseband"?The former (DSB) can be expressed asV(t) =Ax sin(w1t) x sin(w2t)The latter (AM) can be expressed asV(t) =Ax sin(w1t) x [1 +Bsin(w2t)]wherew1= 2pi x (carrier frequency) andw2= 2pi x (baseband frequency)

author: mag_therm
author_rank: Frequent Contributor
timestamp: June 23, 2022, 04:21:17 pm
content: If you want to do it on pcb, look at the datasheets for the MC1496 and the SA612A.Both have sample circuits and details of how you could use your generators as sources of carrier and signal.
Want microscope picture to compare different LCD technologies - Page 1
Forum section: electronics / general

author: Logan
author_rank: Frequent Contributor
timestamp: June 19, 2022, 03:15:40 pm
content: Hi friends.I have been trying to understand the real physical difference among major LCD panel types, such as TN/IPS/VA.There are tons of articles online explaining the difference, but the best are only with simulated pictures, which leaving me still confused after years.Do you guys happen to have any good source of real microscope photos comparing different LCD panels?Thanks!

author: Logan
author_rank: Frequent Contributor
timestamp: June 21, 2022, 02:22:52 pm
content: Quote from: evb149 on June 19, 2022, 03:25:58 pmThank you for replying.But this is not what I want...Please look at the 5 sample pictures, I want something showing structure like those, but with real photos.Thanks.

author: tom66
author_rank: Super Contributor
timestamp: June 21, 2022, 03:07:37 pm
content: Those structures are transverse to the panel, so I suspect the only way you'd get them would be to destroy a panel by cutting a piece out and looking at it that way. That might be difficult given the panel is often made of tempered glass that's difficult to cut precisely, and the panel is not continuously glued together (usually it is just at the edges and the glass keeps it rigid, though the polariser is glued on continuously as it is made of plastic), so keeping the parts in alignment for a photograph would be difficult. And all you would see is glass components. The LC is a mostly translucent liquid (and it's toxic, so you want to avoid getting that anywhere).
Bus bar like connector for 2x2x0,8 mm2? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: June 21, 2022, 11:15:37 am
content: Hi All,I need to connect a ~ 10 cables (2x2x0,8mm2). It’s a KNX bus cable, so each wires is connected to the other 10 times. I’m looking for 4 terminal block style to do this. It needs (preferably) to be done “permanently” behind a wall, so i’m not planning to access it anymore once its done (and tested).Looking for some advice what would be the best way to connect those 10 wires in groups of 4?I found these WAGO 812 series. But I’m not sure if this is they right way to go:https://www.wago.com/us/rail-chassis-terminal-blocks/busbar-terminal-block/p/812-104Many thanks!
AWM 20706 - Page 1
Forum section: electronics / general

author: Giingerben
author_rank: Newbie
timestamp: June 20, 2022, 12:48:22 am
content: Hi all, great to see there are still communities out here still helping one another out!I have a fault with a AWM 20706 105c 60v vw-1 ribbon which is used to connect the LED lighting module on my laptop. When I search for a replacement, it seems they do not exist post market and I can only find 20624 80c 60v vw-1. Will this cable work as a replacement?Thank you in advance for any help!Ben
The great Dunkirk audio mystery - Page 1
Forum section: electronics / general

author: Neper
author_rank: Frequent Contributor
timestamp: June 12, 2022, 06:54:49 pm
content: A few ears ago, this contraptionwas standing in the port of Dunkirk, France, and it made the following noise:http://www.fotoralf.be/audio/dunkirk_mystery.mp3The recording covers a complete sequence which repeated itself over and over.I've been asking ever since in various places online, but so far to no avail. Any idea what this could have been?

author: strawberry
author_rank: Super Contributor
timestamp: June 12, 2022, 07:11:21 pm
content: bird sausage making machinehigh power ultrasound (some harmonics/resonance can probably hear)could be some binary ASCII code

author: MK14
author_rank: Super Contributor
timestamp: June 12, 2022, 10:06:23 pm
content: Only guessing. Fish/Whale, deterrent device, to keep them away from the port?https://www.salmonscotland.co.uk/facts/faqs/fish-health-welfare/how-do-acoustic-deterrent-devices-work

author: radar_macgyver
author_rank: Frequent Contributor
timestamp: June 12, 2022, 10:20:54 pm
content: Just based on the shape, I was going to guess it's awind profiler radar, but those are silent and often have a large equipment van nearby. From the audio recording, I think it's aSODAR. I've never used one, but it fits the descriptions I read online. It looks very similar to aRemtech PA-05, Remtech being a French company.Edit: found a workingdatasheet link. It states 9 different frequencies, centered around 1 kHz. Sounds about right. Even the trailer looks similar, with the reflector stripe along the wheel well.

author: Neper
author_rank: Frequent Contributor
timestamp: June 13, 2022, 09:49:47 am
content: Quote from: radar_macgyver on June 12, 2022, 10:20:54 pmIt does indeed. I hereby declare this mystery solved. :-)Thanks a lot.
MATLAB/ Simulink modeling - Page 1
Forum section: electronics / general

author: Mamzi
author_rank: Newbie
timestamp: June 07, 2022, 09:02:59 pm
content: Hi Guys,What is the difference betweenmodeling a mathematical equation of an electrical circuit by using basic and commonly used blocks in Simulinkvsmodeling electrical circuits using electrical blocks from the Simulink library?I am new to MATLAB and Simulink.

author: Vovk_Z
author_rank: Super Contributor
timestamp: June 11, 2022, 12:22:13 am
content: 1. Your question sounds like a question: Is there a difference between two different models?2. I don't remember: are there any electrical blocks in Simulink library, or they belong to other libraries? I guess Similink works only with pure noname "signals", but not with electrical values.

author: RoGeorge
author_rank: Super Contributor
timestamp: June 11, 2022, 09:18:35 am
content: Probably none if you model correctly.Slightly off-topic, for electric/electronic circuits, in practice everybody uses LTspice for simulations, or some other similar simulator, like PSpice, QUCS, TINA-TI, etc. Matlab or Octave are rather rare in day to day EE work, those are used only for academic purposes or for uncharted research. Otherwise an EE uses LTspice.

author: rstofer
author_rank: Super Contributor
timestamp: June 12, 2022, 05:45:57 pm
content: Search for Simscape Electrical for more information on electrical components for modeling. Simulink uses math blocks for modeling. Different products that are MATLAB add-ons.The thing is, LTspice can't interface with an external device (like an Arduino) while implementing a control strategy in a simulation and it most certainly can not build a GUI interface for the simulation.MATLAB is awesome!Check out the Enigma machine simulation late in this video:https://www.mathworks.com/videos/the-enigma-machine-and-matlab-107967.html
How to retrieve data back from HP-4140b using AR488 & python - Page 1
Forum section: electronics / general

author: RichardM
author_rank: Frequent Contributor
timestamp: June 24, 2022, 01:07:08 pm
content: Hi allI have spent some time trolling the forum but cannot seem to find the answer I am afterI am just playing with remote controlling an HP-4140b Pico meter and Voltage Source unit. I have a AR488 GPIB controller and it works pretty well using Test Controller but I though I would try my hand at Python. The code below starts a sweep on the HP-4140B but I am unsure how to retrieve readings from the device without the use of HPBASIC "ENTER" command. The variable datain contains nothing from a serial read. If I set the AR488 to ++auto 1 I do get something back b' LC+000.0E-12,A+010.0\r\n' but I was hoping to be able to query the device instead. Any thoughts much appreciated as always.import argparseimport serial,osimport timeimport sysport = "COM7"baud = 115200#Serial port configurationcom = serial.Serial(port, baud, timeout=1)if com.isOpen():print(com.name + ' is open...')#Print outputwhile True:cmd = input("Enter to run or 'exit':")if cmd == 'exit':com.close()exit()else:com.write(b'++addr 19\r\n')# com.write(b'++auto 1\r\n')time.sleep(1)com.write(b'F3RA1I2A1B1L2M3\r\n')com.write(b'PS-11.0;PT11.0,PE1.0NPH1;PV1,PB-5\r\n')com.write(b'W1\r\n')time.sleep(1)datain=com.readline()print(datain)
What IC is this? USB 3W audio amp pcb - Page 1
Forum section: electronics / general

author: Tsardoz
author_rank: Newbie
timestamp: June 13, 2022, 06:15:15 am
content: OK I bought a USB speaker I think I identified as this onehttps://i-item.jd.com/10041072500661.htmlas it has sort of the same model number as the PCB (see photo)Image did not attach properly - I dont know how to do thishttps://ibb.co/HrrnT0YThe problem is, when driving it with a Raspberry Pi sometimes the sound is very distorted, slow and a bit quiet.I think the problem is with USB DAC/CODEC.I want to track the problem down but first I would like to identify the ICs but the numbers have been erased.Given the pinout of the 8 pin amplifier it looks to be an 8002 or similar (pins 5 and 8 connected to the speaker).The USB DAC is much harder to identify. It looks like pins 13 and 14 are wired to the amp via R/C.Yet I cannot find a chip that meets these specs.Probably some cheap Chinese knockoff.This board might have the same IC but again no visible identifcation.https://www.aliexpress.com/item/32680489310.htmlAny ideas?

author: dietert1
author_rank: Super Contributor
timestamp: June 13, 2022, 09:42:48 am
content: Maybe similar:https://raw.githubusercontent.com/Arduinolibrary/DFPlayer_Mini_mp3/master/DFPlayer%20Mini%20Manual.pdfChip: YX5200-24SSRegards, Dieter

author: Tsardoz
author_rank: Newbie
timestamp: June 14, 2022, 04:56:39 am
content: Thanks.It is not that one due to pincounts but it is a great idea.I had not considered usb mp3 players.
Microplastics found in fresh Antarctic snow - Page 1
Forum section: electronics / general

author: Black Phoenix
author_rank: Super Contributor
timestamp: June 09, 2022, 01:45:02 am
content: https://www.bbc.com/news/science-environment-61739159QuoteQuoteQuote

author: Stray Electron
author_rank: Super Contributor
timestamp: June 09, 2022, 02:29:29 am
content: Sorry but that is OLD news. Pollutants have been found in every corner of the planet including in the oceans, on the land and in the snows of the Arctic and Antarctic.

author: MikeK
author_rank: Super Contributor
timestamp: June 09, 2022, 07:15:48 pm
content: The good news is that I'll be dead before the shit REALLY hits the fan.

author: Gyro
author_rank: Super Contributor
timestamp: June 09, 2022, 07:30:20 pm
content: So much better than the younger generations who will justwishthey were!

author: MikeK
author_rank: Super Contributor
timestamp: June 09, 2022, 08:36:58 pm
content: Yeah, probably in a few generations. But if humanity survives I should think it will be better for it (long term, though)...having learned hard lessons and becoming better stewards of the planet.

author: tszaboo
author_rank: Super Contributor
timestamp: June 09, 2022, 10:37:18 pm
content: Quote from: MikeK on June 09, 2022, 08:36:58 pmYep, it's too late for us anyway.This is the 4th state of grieving, you are just one step away from acceptance. Then you can actually start doing something about it. Good job, keep going!

author: Stray Electron
author_rank: Super Contributor
timestamp: June 10, 2022, 01:27:24 am
content: Quote from: MikeK on June 09, 2022, 07:15:48 pmSo you're saying that you'll be dead before all of the man-made problems can kill you? That wouldn't sound very reassuring to me.

author: pcprogrammer
author_rank: Super Contributor
timestamp: June 10, 2022, 05:26:17 am
content: Quote from: Stray Electron on June 10, 2022, 01:27:24 amTo me it sounds better than to have to live with all the shit that can arise. And lets face it the human race does not learn from the past. Just look at Russia and the Ukraine at the moment. Nobody want's war, but they still proceed with it. And it is not just the people of these countries that suffer, it spreads and is misused by the big money to make more money. And therein lies the problem that will be the downfall of mankind. Greed. At least that is my view on it.
controlling an HVAC motor with mains pulses ? - Page 1
Forum section: electronics / general

author: kripton2035
author_rank: Super Contributor
timestamp: June 02, 2022, 08:56:38 am
content: Hi folks,I made some module to control the speed of an HVAC motor (which must be an induction asynchronous one ?)I tried to speed control it using a variable phase triac method and this doesn't work (very little 10° where you can change speed from zero to max)so I tried to control it's speed using a pulse train of 50Hz 230V.I detect the zero cross of the mains, then send 1 to 10 pulses of 230v 50hz with a triacit's been made with an esp8266 using arduino IDE.it's working as the speed of the motor can be controlled from 0 to 100% in a 10% increment.but I have some concerns.1/ the motor is making some inhabitual noises, is there a way to reduce them ?2/ isn't it dangerous for the motor life span ?thanks for any hint(s) on the subject.

author: kripton2035
author_rank: Super Contributor
timestamp: June 02, 2022, 08:59:44 am
content: this kind oh hvac motor

author: kripton2035
author_rank: Super Contributor
timestamp: June 07, 2022, 09:25:29 pm
content: nobody ?
My usual random philosophical sweeping statements - Page 1
Forum section: electronics / general

author: Peter Taylor
author_rank: Regular Contributor
timestamp: June 07, 2022, 01:22:58 pm
content: A utube video describing sound with a sine wave drawn on paper is not usefull in research in my buisness of building high fidelity guitar amplifiers. At all.

author: eugene
author_rank: Frequent Contributor
timestamp: June 07, 2022, 03:39:34 pm
content: Thanks. I'm making a list of all the things and the situations in which they are not useful. I'll add this.
Post your workbench setup - Page 1
Forum section: electronics / general

author: bladerunner
author_rank: Newbie
timestamp: June 06, 2022, 09:04:51 am
content: hello,I couldn't find a similar topic. As someone who's starting out, I always enjoy seeing people's electronic workbench environments and setups (most are messybut some are organized )In any case, let's see what your workbench looks like!p.s. I'm still building mine but I'll post it once it's complete

author: MK14
author_rank: Super Contributor
timestamp: June 06, 2022, 09:24:50 am
content: https://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/
Pulsing (and now dead) “2D” led lamp  - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: June 02, 2022, 09:45:49 pm
content: Hi folks.I have an led lamp (240vac, UK) Which has been pulsing (flashing) about two or 3 Hz, for about six months now. After a while it settle down and stays on… This is the kind of lamp…Would it be likely that this is a bulging and/or dried out electrolytic cap? It’s pretty hard to access the Lamp, so I don’t want to go and take it out Until I’m prepared for what it could be.Thank you ever so much

author: eti
author_rank: Super Contributor
timestamp: June 02, 2022, 10:56:08 pm
content: The 10uF, 400V electrolytic on the 240 vAC mains input to the driver PCB has ESR: 0.14K, Vloss:9.9%I know little about ESR, but that looks way too high?

author: David_AVD
author_rank: Super Contributor
timestamp: June 02, 2022, 11:57:06 pm
content: Yes, that cap is boned.

author: eti
author_rank: Super Contributor
timestamp: June 03, 2022, 12:22:08 am
content: Quote from: David_AVD on June 02, 2022, 11:57:06 pmReplaced the cap, lamp is still dead.

author: David_AVD
author_rank: Super Contributor
timestamp: June 03, 2022, 12:30:04 am
content: Hard to know without seeing what else is in it.Maybe run your meter over each LED to make sure none have gone open circuit. Sometimes you can see the dead one(s) by a tiny black mark.I've seen lamp failures where it was the driver pulsing, but also ones where one LED in the chain went open. They then arc and complete the chain for a bit, drop out again, etc.
Where can i buy VFDs that ships internationally? - Page 1
Forum section: electronics / general

author: drakejest
author_rank: Regular Contributor
timestamp: May 25, 2022, 08:05:33 pm
content: Hello was wondering if anybody knows place/site that sells VFD (Variable Frequency Drive) from the well known brands (Siemens,Schneider,Rockwell, and etc) ? Specifically for a single -phase 240VAC 2HP (1500W) motor.International shipping is a mustDigi-key sell VFD from DELTA Electronics, no idea if that is good, but since digi-key is selling them, they must be atleast decent.

author: geggi1
author_rank: Frequent Contributor
timestamp: May 25, 2022, 08:36:43 pm
content: Try contact Vacon.They have very good drives and free configuration software.https://www.vacondrives.com/

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 26, 2022, 04:55:47 pm
content: I can't tell which country you're in. I think you meant that the VFD input power is single phase 240VAC but the output is 3 phase.

author: Zero999
author_rank: Super Contributor
timestamp: May 27, 2022, 12:23:23 pm
content: Yes, a VFD is unworkable for a 1.5kW motor. The original poster must mean single phase in, three phase out.RS Components sell them, along with numerous other suppliers.

author: WattsThat
author_rank: Frequent Contributor
timestamp: May 27, 2022, 11:56:14 pm
content: Inverter out of the UK is the only major vendor that builds a single phase output VFD.

author: BrokenYugo
author_rank: Super Contributor
timestamp: May 28, 2022, 12:51:16 am
content: Quote from: Zero999 on May 27, 2022, 12:23:23 pmAFAIK you can put single phase into most 3 phase input VFDs, just require derating to account for the now undersized rectifier diodes and filter caps. I would assume OP really wants a single phase in/out unit, which are quite rare as they have limited application and motor compatibility (won't work with anything with a start cap or switch). Generally better to just find an appropriate 3ph motor and use a readily available VFD.

author: Black Phoenix
author_rank: Super Contributor
timestamp: June 02, 2022, 01:07:36 pm
content: Quote from: drakejest on May 25, 2022, 08:05:33 pmDelta Electronics is a fair know brand. I've used one of their models VFDs, the VFD022M43B 3 phase and it was easy to implement in a solution, with good documentation available.Before that the company itself had used other Delta VFD models in diverse machines and production solutions without any problems or lack of reliability.
[SOLVED] iodd model 2541 has blown SMD labeled "AC7VA", need info... - Page 1
Forum section: electronics / general

author: Holes Flow
author_rank: Contributor
timestamp: March 01, 2022, 08:44:22 pm
content: Experts,This thing is amazing. For $70USD, I threw a 1TB SSD in it, and it worked flawlessly-until it broke. Just wouldn't boot.One day, she didn't wake up...! Attempted to revive with firmware upgrade, but the USB bus doesn't recognize it. Open heart surgery, and found a cap exploded, causing this chip to overheat & crack. I can make out AC7VA clearly on the top, but that is it. Google search pulls up nothing.Would appreciate clues, replacements/equivalents, anything. A replacement is $80, but it'sperso0nalnow!TIAP.S. Attached are a microscope shot of the chip, and for context the entire top of the PCB on the iodd 2541...

author: bsfeechannel
author_rank: Super Contributor
timestamp: March 02, 2022, 12:18:48 am
content: What about contactinghttp://www.iodd.kr?

author: amyk
author_rank: Super Contributor
timestamp: March 02, 2022, 04:49:58 am
content: SY8008CAAC

author: Holes Flow
author_rank: Contributor
timestamp: June 01, 2022, 10:12:11 pm
content: Many, MANY times I tried... In various languages, but did not want to call them, as I don't know anyone who speaks Korean, and it costs a lot to talk to the other side of the world. Zero contact, and I offered to buy the part, the schematic, anything.I do see that @amyk somehow managed to identify it!

author: Holes Flow
author_rank: Contributor
timestamp: June 01, 2022, 10:12:42 pm
content: Amazing!
Baffling "game" circuit mechanisms - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: May 31, 2022, 08:42:19 pm
content: Anyone playing Factorio?Figured out the logic circuits yet?It took me 2 hours of trial and error with many, "Emmm...", "Errrrr...", "Okay....", "Wait, WTF?", "No.. but... ", cycles... to implement a basic "On below 6. Off above 10." (asymetric) trigger.It's not like code and it's not like electronics, but a bit of both.Refreshing in a way, but I'm too "type cast" on day2day stuff and it takes me a long time to figure stuff out.To consider:https://youtu.be/-XHfyg8lYJY

author: MK14
author_rank: Super Contributor
timestamp: May 31, 2022, 09:35:47 pm
content: I'd suggest reading and possibly creating a thread about it, on the steam community forum, for that particular game.E.g.https://steamcommunity.com/app/427520/discussions/0/3276942370880376321/?tscn=1652144609Also, plenty of trial and error. Until you eventually get it the way you want. Unlike real circuits, there is little chance of it exploding and causing pollution, in real life.Sometimes a games concepts and ways of doing things, takes plenty of testing out, time and examples. To get it working out nicely.People seem to be saying that YOUR game (Factorio), has plenty of challenges like that. But they are fun to experiment with, and tweak, until they are working just right. Which some find, lots of fun and a sense of achievement with.

author: tszaboo
author_rank: Super Contributor
timestamp: May 31, 2022, 09:36:13 pm
content: Factorio is a lot of fun, but the logic implementation is a bit wierd. They have signal names, like 6, when the signal is named "the 6 icon" and nothing to do with the number 6.Even a simple logic, like "Switch on coal generator when battery is almost empty" takes a while to setup. And there is not time for that, the factory must grow.

author: RJSV
author_rank: Super Contributor
timestamp: June 01, 2022, 02:21:37 am
content: Hope it helps, a little, THATS Hysterisis, where a switch to 'ON' would effect the threshold (for turning back OFF). That way, a very noisy signal can't send your circuit into little, spurious pulses, that follow the noise, rather than the longer lasting, 'legitimate' full swing of your voltage...
pin 1 location - Page 1
Forum section: electronics / general

author: Hornnumb2
author_rank: Regular Contributor
timestamp: May 27, 2022, 02:59:24 pm
content: trying to figure out which is pin one on this eeprom. Thanks

author: tooki
author_rank: Super Contributor
timestamp: May 27, 2022, 03:13:52 pm
content: Unless there’s a clear marking to indicate otherwise, with the text oriented normally, pin 1 of an IC is always bottom left.And of course there’s always the datasheet. You can find those online.

author: gamalot
author_rank: Super Contributor
timestamp: May 27, 2022, 03:14:44 pm
content: Bottom left corner in your image. Although this package does not have a dot to identify the Pin 1, it should have a chamfer on thelowerbottom side.https://www.st.com/resource/en/datasheet/m24c16-w.pdf

author: jmelson
author_rank: Super Contributor
timestamp: May 27, 2022, 03:16:47 pm
content: The chamfered side of the chip appears to be toward the bottom of the picture. If so, pin 1 is at the bottom left.Jon

author: m k
author_rank: Super Contributor
timestamp: May 27, 2022, 06:02:36 pm
content: Is there a round leg of something at the bottom right of the picture?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 27, 2022, 06:07:58 pm
content: bottom-left, indicated by chamfer

author: MikeK
author_rank: Super Contributor
timestamp: May 27, 2022, 11:24:24 pm
content: Also, the chamfer should be indicated in the datasheet.

author: DavidAlfa
author_rank: Super Contributor
timestamp: May 28, 2022, 02:31:46 pm
content: Sometimes there's also a mark under the IC.

author: VK3DRB
author_rank: Super Contributor
timestamp: May 30, 2022, 12:35:17 am
content: If there is no top overlay ("white ink"), one might ask why there is no pin one marker on the PCB. Saving cents perhaps?If there was a pin 1 marker, the best PCB pin 1 markers are solid filled triangles, not circles that look like fly vomit or vias. Triangles are superior for a number of reasons. But most engineers use the default fly vomit because they don't know much better or don't care.
Material magnetic characteristics - Page 1
Forum section: electronics / general

author: zilvinis
author_rank: Newbie
timestamp: May 31, 2022, 09:32:21 am
content: Hello, I have a quiction about hight freuency magnetic cores about what a differnce bitveen PC40 and ZP40 types. I looking to do a dc-dc inverter from EE55 cores that gives a small or non sharp spikes that triple a voltage jump.

author: thm_w
author_rank: Super Contributor
timestamp: May 31, 2022, 10:46:58 pm
content: ZP40 is some chinese (?) equivalent MnZn product, you can compare them:https://product.tdk.com/en/system/files?file=dam/doc/product/ferrite/ferrite/ferrite-core/catalog/ferrite_mn-zn_material_characteristics_en.pdf
[LTT]I Can Die Now. - Intel Fab Tour! - Page 1
Forum section: electronics / general

author: MathWizard
author_rank: Super Contributor
timestamp: May 28, 2022, 02:17:45 am
content: I wonder what the cheapest test equipment is, Intel would ever use in their factories/foundries

author: tom66
author_rank: Super Contributor
timestamp: May 28, 2022, 10:19:42 am
content: There's probably a DMM somewhere used by an electrician. Maybe even a Volt-Stick!

author: daqq
author_rank: Super Contributor
timestamp: May 28, 2022, 11:36:15 am
content: I like how everything is blurred

author: hans
author_rank: Super Contributor
timestamp: May 28, 2022, 01:28:05 pm
content: Well, it's better a tour than Apple's "silicon" lab you see in press talks, where they place a15$ board holdermade of plastic (but admittedly, it's blue plastic) on a bunch of suspiciously empty white tables to make it seem hi-tech:https://youtu.be/CUwg_JoNHpo?t=1792Blue is exquisite right? Their background lighting is blue. Their screwdrivers are blue. The guy even wears a blue shirt.I digress. That was actually quite cool to see, but also it kind of breaks the magic for me. Apparently even Intel cannot formulate the equivalence of a closed-form expression to QA testing: just get a wide range/variety of products and bruteforce test them, hoping that will cover everything that's out there. It's an approximation of the real solution which would test an infinite range of devices.. Also looking at some of the OSS NVIDIA driver code that was released not too long ago, it's full of if (MANUFACTURER == THIS && PANEL_ID == THAT) { /* APPLY TIMING HOTFIX */ }I was hoping that electronics from these manufacturers would have use well defined and tested standards (separate from the products) considering the high cost involved for development.Oh well. They also released a 2nd video last week:That machine that can fine tune individual transistors is so cool.. unfortunate that most of it was proprietary and hidden from cameras.

author: MathWizard
author_rank: Super Contributor
timestamp: May 28, 2022, 06:51:36 pm
content: Linus went back again, and got to see some cool test beds for PCIe 5 testing
HP Meter OLED Display Replacement Project - Can anyone help me out with a link? - Page 1
Forum section: electronics / general

author: Tony_G
author_rank: Super Contributor
timestamp: May 28, 2022, 12:41:03 am
content: Hey All,My search-fu is really lacking and I can't find this.A couple of weeks ago (I think) someone posted about a fantastic project that was done to replace the LCD display in an oldish HP meter with individual OLED segments - Basically the person was decoding the incoming data stream for the old LCD display and then handing it off to individual OLED displays that they had purchased off AliExpress/Alibaba/Etc. Each display segment was something like 128x64 (or possibly smaller) and they had code to display just that digit and an annunciator that HP included in the original LCD. To make matters worse I can't even remember the HP device that they were working onI find myself contemplating fixing up a partially working LCD display on an old HP 7090A and I'd like to have a good backup plan if I hose the original LCD display as these measurement plotters seem pretty rare (I haven't been able to find a parts mule for this).Any help would be appreciated.Thanks,TonyG

author: bdunham7
author_rank: Super Contributor
timestamp: May 28, 2022, 12:51:24 am
content: https://www.eevblog.com/forum/testgear/hp3548-hp3457-oled-display/msg3980960/#msg3980960

author: Tony_G
author_rank: Super Contributor
timestamp: May 28, 2022, 01:02:11 am
content: Thanks - Exactly the one I was thinking about - Appreciate the help.TonyG
Where to post a question about didactics: here or the beginner section? - Page 1
Forum section: electronics / general

author: Sredni
author_rank: Frequent Contributor
timestamp: May 25, 2022, 04:44:16 am
content: What is the best part of the forum to post a question about how to best answer a student's doubts?I can post the question as the student formulated it, and I would like to see what answers - if any - are best suited to answer their doubts.It is a beginner, first year, question about transistors, so the kind of questions that are asked in the beginner section, but I am more interested in the process of extracting the student's doubts/holes from the question, than in the actual answer.The topic seems more a chatty topic, while the people that can answer are probably more in the Beginner section...Dang, Hamlet had it easy...

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 25, 2022, 06:53:13 pm
content: If in doubt, pick what seems the best and a mod will move it if you guess wrong...General or beginners sounds like the idea.I don't know about others, but I personally just browse by "show unread", I don't much care which section something's posted under... YMMV.Tim

author: RoGeorge
author_rank: Super Contributor
timestamp: May 25, 2022, 08:09:21 pm
content: Even more, you can move your own threads without the mods' help.So open it one place, and then move the other place if the answers were not what you were expecting for.

author: Sredni
author_rank: Frequent Contributor
timestamp: May 25, 2022, 09:24:03 pm
content: Ok, thanks.I have posted it in the beginner's section:https://www.eevblog.com/forum/beginners/a-simple-transistor-question/So, basically now, it's on both sections.
Products that use carbon fiber as an electrical conductor? - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: May 21, 2022, 11:10:31 am
content: I'm curious to learn how many industries/products use carbon fiber to carry electricity.One example I found: big chicken coop heat lamps have a CF filament, seehttps://youtu.be/MG8o3tQYkMoI have heard some heated floors use a CF mat?Please share other examples if you can, thank you.

author: thm_w
author_rank: Super Contributor
timestamp: May 24, 2022, 10:21:28 pm
content: Wonder what the advantage is over just regular quartz space heater in this case?- Heated wires for floors (seebig clive)- Heated wires in steering wheels or car seats- Heated wires in gloves/vests (good as its light weight)- Heating panels forsaunasIf you find some interesting use for the silicone heated wire there is tons of it available on aliexpress.Looks interesting:https://www.aliexpress.com/item/4001303390319.htmlbut I wouldn't want to play with mains voltage.

author: SmallCog
author_rank: Frequent Contributor
timestamp: May 24, 2022, 10:52:38 pm
content: I reckon I've seen some of those little ozone / ion generator things use carbon fiber in some of BigClives videos too
how to burn/damage PCB - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: May 22, 2022, 02:36:05 pm
content: soldering with 400Cwhen tip is tarnished it wont take solder even with 400C and hot air wont help either

author: jpanhalt
author_rank: Super Contributor
timestamp: May 22, 2022, 04:35:10 pm
content: Weller seems to disagree:https://www.mouser.com/pdfdocs/WellerSoldering.pdfQuote from: page 5I keep mine set at a smidgeon under 750°F (399°C). The only time I have ruined a tip was when I accidently left it on overnight.

author: strawberry
author_rank: Super Contributor
timestamp: May 22, 2022, 07:49:49 pm
content: Quote from: page 3use 250 C for 60/40 and sensitive boardspb free highersoldering and desoldering is not the same

author: langwadt
author_rank: Super Contributor
timestamp: May 22, 2022, 10:18:43 pm
content: Quote from: strawberry on May 22, 2022, 07:49:49 pm250'C is far too low, everything will cooked to death before the solder melts
0-10V speed controller (for fan) with normal 0-10v dimmer? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: May 18, 2022, 10:03:18 am
content: Hi,I need to install a tube fan. This one has a 0-10v RPM speed control function.Is this something you can control with a "regular" 0-10v "dimmer" or would you still need some special RPM speed controller?Many thanks!R.

author: tom66
author_rank: Super Contributor
timestamp: May 18, 2022, 11:01:15 am
content: 0-10V just refers to the control input. If the input to the fan controller is just 0-10V, I can't see any reason it would not work.The caveat is if you tried to control a fan with e.g. a light dimmer with a 0-10V input. That would probably result in an angry light dimmer, followed by smoke, so I would not recommend that.

author: onesixright
author_rank: Frequent Contributor
timestamp: May 19, 2022, 07:45:55 am
content: Quote from: tom66 on May 18, 2022, 11:01:15 amNot sure what you mean with this?

author: tom66
author_rank: Super Contributor
timestamp: May 19, 2022, 10:17:59 am
content: Quote from: onesixright on May 19, 2022, 07:45:55 amIf you use a dimmer switch with a 0-10V input that is intended for dimming a light, and try to drive the fan motor with it, the result will likely be the destruction of the dimmer switch.

author: ledtester
author_rank: Super Contributor
timestamp: May 19, 2022, 02:36:33 pm
content: Quote from: onesixright on May 18, 2022, 10:03:18 amDo you have the datasheet for the tube fan? That's where we're going to find the answer.It is very possible that you can simply use a potentiometer but to verify that and to understand how it needs to be hooked up we would need to see the datasheet/technical documentation for the device.

author: onesixright
author_rank: Frequent Contributor
timestamp: May 19, 2022, 09:54:30 pm
content: This is whats in the technical manual:QuoteThe vendor hasexplicitlytold me that you can buy a "Speed controller R-1/010" and that the fan can be controlled via 0-10V (it has apparently a 0-10v connection).This is the speed controller:https://ventilation-system.com/series/r-1-010I don't want to use a manual speed controller, but control the fan via my HA (KNX). KNX has dimmers that can output 0-10v. The "problem" is these are stilled called "dimmers". I suspect they only output a 0-10V signal that tells the fan what speed it needs to run (probably some PWM for 0-100%).

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 21, 2022, 11:07:30 am
content: I think the fan has all the circuitry needed to be be controlled by a 0-10V signal. So you need to supply it with power and the 0-10V signal.

author: Jeroen3
author_rank: Super Contributor
timestamp: May 21, 2022, 06:18:55 pm
content: Speed controller R-1/010 looks like a potentiometer with switch.I think you can use KNX analog actuator without problems, that's not a dimmer, but a 0-10V analog output.I can't recommend you one though.
How to record low frequency mechanical wave,such like noise of pump? - Page 1
Forum section: electronics / general

author: youta556
author_rank: Contributor
timestamp: May 19, 2022, 11:11:53 pm
content: When My neighbor use water pump, I feel low frequency noise in room.I think the noise come from sound wave,maybe add some resonance but I cannot feel vibration when I touch wall.I try to talk with neighbor,before that I would like to record the noise as proof.I have questions as below:1.How to distinguish the noise,is that sound wave or resonance?2.As I have only iphone and mono sound recorder,is that possible to record low frequency noise?Thanks in advance.

author: ledtester
author_rank: Super Contributor
timestamp: May 19, 2022, 11:18:04 pm
content: Find a spectrum analyzer app for your phone. It might identify the frequency you are sensing.

author: eugene
author_rank: Frequent Contributor
timestamp: May 19, 2022, 11:32:25 pm
content: You need to record the output of an accelerometer. Phyphox on your phone might work well enough. Good for the price...

author: ebastler
author_rank: Super Contributor
timestamp: May 21, 2022, 06:55:02 am
content: I would suggest that you talk to your neighbor right away. Explain the situation, ask them to turn on the pump and come over to your place for a moment. Listening to the noise "live" will be the only way to get a perspective how noticeable and potentially annoying it is.
DDR4 DIMM extender connector? - Page 1
Forum section: electronics / general

author: electron_ken
author_rank: Newbie
timestamp: May 20, 2022, 09:46:26 pm
content: Hi,I am looking at designing a board that has a DDR4 DIMM socket connected to the edge, similar to the DDR4 DIMM extenders on ebay. e.ghttps://www.ebay.co.uk/itm/354053750745Picture attached.I am struggling to find a suitable connector to fit. Most are designed to fit perpendicular to the board, rather than on the board edge.I have ordered one of the ebay boards to have a look at, but it could take weeks to get here, and may not have any manufacturer or part number on the connector.Perhaps these extenders somehow bodge a through hole perpendicular connector for the job, although all the connectors I have found so far have 4 rows of pins so could not be used like that.I could buy a few of the ebay boards and try to remove the connector to re-use it, but would prefer not to.Anyone got any idea?Many Thanks, Ken
Quick question: What other footprints are loosely compatible with SOT223. - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: May 29, 2022, 08:31:11 am
content: Quick question:What other mosfet footprints are loosely compatible with a SOT223 footprint?I have a whole lot of old blank PCBs intended for SOT223 mosfets which are hard to find atm.I plan to hand solder these and reflowing, so anything close would be fine. It just needs to fit more or less.(Obviously I also need to check the pinout)

author: Psi
author_rank: Super Contributor
timestamp: May 29, 2022, 08:39:42 am
content: Nevermind, i managed to find an instock SOT223 hiding under TO-261-4

author: Psi
author_rank: Super Contributor
timestamp: May 29, 2022, 08:41:18 am
content: I also found this website, which makes finding alternative footprint names easier.You might want to bookmark it too.https://blog.mbedded.ninja/pcb-design/component-packages/