hybridfree/eevblog-posts huggingface dataset:
Speech Recognition  - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: June 15, 2021, 01:18:55 am
content: Many years ago I had an opportunity to tour Bell Labs. I had friends who worked at Western Electric and had toured parts of their facility as well. One of the things I remember was seeing a speaker independent recognition system they were working on. We took turns talking into the microphone and that system was very accurate. Their vision was to allow you to make hands free calls and one of the early applications was to automate the university enrollment over the phone. Seeing that system work sparked an interest in the subject. At one point I attempted to make my own system from scratch. It somewhat works but is very crude. Later in my career I was on a team working with one of the world leaders on recognition. In the 90's I had a system from Dragon and an earlier unit that I no longer remember the name.Now it's mid 2021 and I have not thought about speech recognition in many years. I was on a Teams conference the other day and noticed it had a recognition system so I enabled it. I couldn't believe what I was seeing that Microsoft system do. Multiple people talking fast and that thing was hardly missing a beat. There's no way they pulled that out of their ass, so I did a little reading. A familiar name came up. Did they buy Dragon or just license the technology.What a difference from my home made system from my youth.

author: Kerlin
author_rank: Regular Contributor
timestamp: June 15, 2021, 06:35:43 am
content: I remember the early days of speech recognition.At the time I read in a technical journal that one bright spark, who was invited to seminar on it, walked in saw on a projector screen that the system was operational and the guests were welcome to try it.He yelled out "Start, Run, CMD.exe, C, D, C, colon, back slash, enter, format C " and it worked.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 15, 2021, 04:49:35 pm
content: Quote from: Kerlin on June 15, 2021, 06:35:43 amThat mad lad, he basically ordered the computer to self destruct!

author: james_s
author_rank: Super Contributor
timestamp: June 15, 2021, 04:54:56 pm
content: IIRC Windows won't let you format the system drive, although maybe there's a way to override that? I never tried *that* hard. It will work on Linux though, sudo rm -r is very dangerous, always, always make sure you are in the directory you intend to be in before using that command.

author: Kerlin
author_rank: Regular Contributor
timestamp: June 15, 2021, 10:28:02 pm
content: Quote from: Kerlin on June 15, 2021, 06:35:43 amQuote from: james_s on June 15, 2021, 04:54:56 pmZero for reading comprehension.Thats around 1998.
Component identification - help - Page 1
Forum section: electronics / general

author: k.valentino
author_rank: Contributor
timestamp: June 14, 2021, 11:51:33 pm
content: Hi, need help with identification one transistor(or maybe voltage regulator). I need to replace it.MMBT2907AThe transistor is burned and is from car's gas analyzer machine that have problem with the display.

author: cortex_m0
author_rank: Regular Contributor
timestamp: June 15, 2021, 01:43:35 am
content: MMBT2907A makes sense, if the theory of the circuit is to vary the LM324 negative supply rail with changes in temperature.I'm not sure why you'd do that, but it's a circuit I could imagine working.

author: SpecialK
author_rank: Regular Contributor
timestamp: June 15, 2021, 03:23:17 am
content: Is it really burned?The SMD code app on my phone suggests 2.5V LDO.I guess I wouldn't mind a look at the complete board.

author: k.valentino
author_rank: Contributor
timestamp: June 15, 2021, 10:29:59 am
content: Quote from: SpecialK on June 15, 2021, 03:23:17 amThanks for the answers! Yes, the transistor is burned (have fuga).

author: bob91343
author_rank: Super Contributor
timestamp: June 15, 2021, 05:38:33 pm
content: I would guess the equivalent would be 2N2907A which is in TO-18 package.
Angus Young (AC/DC) guitar amp setup - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 11, 2021, 01:12:11 pm
content: Thought this was interestingly over the top, interesting use of a Kikusui AC power supply. I wonder how many they sell into this industry vs. labs etc.Of course you could do it all with a DSP and some nice reliable solid-state amps, but that wouldn't be so much fun...

author: SteveyG
author_rank: Unknown
timestamp: June 11, 2021, 01:17:29 pm
content: There was a video with Kirk Hammett who has a similar set up with an AC power supply. I think it's fairly common these days.

author: Circlotron
author_rank: Super Contributor
timestamp: June 12, 2021, 12:17:41 pm
content: I'm happy with just a Strat and a horrorbox amp.
If Barnes and nobel goes down what happens to my nooks? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: June 20, 2021, 01:07:53 am
content: I just found my B&W e ink nook (charging at the moment) and color nook. To read and even delete things you had to do it through your bn account, which I dont remember good luck getting ahold of customer service.Some one here must have a older nook, mines from around 2016 when I had tons of money to buy useless toys. Are they useless now?

author: Beamin
author_rank: Super Contributor
timestamp: June 20, 2021, 01:52:00 am
content: So it connects to my wifi, I see my weird free google books I downloaded ages ago, but I think they live on the SD or intternal memory but when you click shop, it says you must connect to wifi and bring up your networks showing that you are already connected. If you try to click like it wants you to it disconnects your wifi.Is there a format I can put on an SD card and read it? Whats a nooks extension .nok? .pdf?

author: amyk
author_rank: Super Contributor
timestamp: June 20, 2021, 03:46:18 am
content: Should've bought a generic ebook reader...

author: james_s
author_rank: Super Contributor
timestamp: June 20, 2021, 04:53:51 am
content: Does it not enumerate as a removable drive if you plug it into the USB port on a PC? I have a Kindle I bought back in 2010 that has never been associated with an Amazon account, I've always just copied files directly to it.

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 20, 2021, 02:14:39 pm
content: Look into hacking it, I recall some of the later ones can run plain Android.

author: dave j
author_rank: Regular Contributor
timestamp: June 20, 2021, 02:53:36 pm
content: Quote from: Beamin on June 20, 2021, 01:52:00 amMine uses epub files. Apart from for the initial registration, I've never let mine connect to the internet. I just plug it into a PC via a USB cable, it presents as a mass storage device and I copy epub files to an appropriate directory (can't remember where /media/MyFiles/books ?). When you dismount the drive it rescans the directories and the books appear in the library app.I did root it so I could add other apps but I don't remember that being necessary to just copy books as described above.
1980s SDI video - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: June 12, 2021, 01:03:24 am
content: Sure, it sounds like it's narrated by the MCP from TRON (I suppose to evade copyright, I just pitch shifted up by 1), but it's so cool. It's got early CG graphics, stock footage, Ronald Reagan, and crazy ideas.A few things don't jive, like showing 1960s Sprint footage for a 1980s system and calling the NPB "negative" particles, but whatevs.Found the earliest footage of the Brilliant Pebbles kill vehicle, I remember seeing that amazing footage in the '90s but I had never heard the hooting and hollering of, I suppose, the engineers.https://youtu.be/lo2JJycxR0w?t=1307I'm still looking for the footage of the neutral particle beam slicing through several targets simultaneously, while the boring old laser had to punch through them one at a time.I like the bonkers physics behind all this.
Pic16f85 how this circuit works ? - Page 1
Forum section: electronics / general

author: harrysmith
author_rank: Contributor
timestamp: June 17, 2021, 08:08:39 am
content: Hi everyone, Is there anyone who can provide a brief explanation of how it works the microcontroller pic16f85 ?

author: Gyro
author_rank: Super Contributor
timestamp: June 17, 2021, 08:22:34 am
content: Please don't double post. It annoys people and eventually the mods ban you.https://www.eevblog.com/forum/projects/how-this-circuit-works/EDIT: Thread title, and OP content has changed in both threads.

author: SeanB
author_rank: Super Contributor
timestamp: June 17, 2021, 08:28:09 am
content: From the looks of it is is either for a desk lift that has AC power with a battery back up, or is something motorised that is portable.K1 switches the power source from battery (the default) to mains operation when power is supplied, and the microcontroller then is detecting mains is applied from the regular pulses from the opto isolated sensor OK1, so then knows there is AC present. The battery voltage is monitored by the voltage divider R17 and R16, and this is used to control the charging of the battery via K4 and R19 to limit current, probably with the software disconnecting when the float voltage is reached, then reconnecting when it is lower, probably via a delay of sorts to keep the relay operation cycles down, likely a 10 minute delay on closing once charged. When mains is applied the motor operation will be powered from the mains, and likely when AC power is removed K4 is opened, so the relay drops out and the battery takes over providing power, with C3 providing enough current during the change over so the microcontroller does not reset itself.K2 and K3 control the motor, 12V at 3A, using input from some remote wired controller fed in via X4, isolated by OK2 and OK3. The 3 status LED's do something, probably one is AC present, one is up and the other is down, with the AC status LED likely blinking when on battery, and staying off, or flashing very briefly when the battery is low. Otherwise IC1 is a standard 5V regulator, probably a 78L05, there to power the microcontroller alone.

author: harrysmith
author_rank: Contributor
timestamp: June 17, 2021, 08:41:51 am
content: it is an electronic box we can put a clock to open or close it
Search term in URL bar instead of address (Chrome Omnibox) backtrack - Page 1
Forum section: electronics / general

author: MrMobodies
author_rank: Super Contributor
timestamp: June 11, 2021, 10:34:47 pm
content: https://www.makeuseof.com/google-chrome-show-full-urls/QuoteI noticed that URL thing a week ago with a Chromium browser that came with the Lineage OS (Android 11) that I disabled for that reason and other stuff.Emily Stark writes that the "experiment didn't move relevant security metrics, so we're not going to launch it".As being a software engineer should she have known this not being good idea at the beginning?https://www.linkedin.com/in/emilymstark/QuoteI wonder if they are just trying to make work for themselves or could it be she was asked or pestered by someone into doing it knowing it wouldn't be good (not seeing the url) but did the right thing in the end and if that is the case then that's quite decent.Do you think this can be open to scams not being able to see the url and when combined with other stuff over it?
Chipmaker SiFive Is Said to Draw Intel Takeover Interest - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: June 11, 2021, 09:07:42 am
content: "Intel offered to acquire SiFive for more than $2 billion, one of the people said,asking not to be identified because the matter is private.""SiFive is a designer of chips that are based on the RISC-V architecture,an attempt to bring open-source standards to semiconductor design making itcheaper and accessible to customers."https://www.bloomberg.com/news/articles/2021-06-10/chipmaker-sifive-is-said-to-draw-intel-takeover-interest
decoding Waveform - Page 1
Forum section: electronics / general

author: NHSA
author_rank: Regular Contributor
timestamp: June 10, 2021, 04:32:51 pm
content: Hi,I did not find a place where to post my question and I hope here it is OK.I have made two small loop antennas for a lightning detecting project based on the Blitzortung hardware.Now I need to find more or less EMI free a place where to loacte the antennas.Is there a way to decode the EMI producer by looking at the waveform the oscilloscope delivers ?For example like the image belowThanks Rainer

author: NHSA
author_rank: Regular Contributor
timestamp: June 10, 2021, 06:04:32 pm
content: Hi,Thank You.This is going to be a fixed setup. I used first the simple method of sniffing EMI using a portable AM radio.Will keep searching and looking at the waveforms I see and perhaps switch on and off a few things at the place and see how they react.Rainer
Intel Offers $2 Billion for RISC-V Chip Startup SiFive - Page 1
Forum section: electronics / general

author: hamster_nz
author_rank: Super Contributor
timestamp: June 10, 2021, 11:47:23 pm
content: Sorry if this has already been posted...https://www.tomshardware.com/news/intel-offers-dollar2-billion-for-risc-v-startup-sifive-bloombergI have mixed emotions...

author: DiTBho
author_rank: Super Contributor
timestamp: June 10, 2021, 11:58:21 pm
content: LOL

author: T3sl4co1l
author_rank: Super Contributor
timestamp: June 11, 2021, 04:08:58 am
content: "Someone familiar with the matter said"Someone's pumping stock prices again. Are either of them short, or something?...Tim

author: coppice
author_rank: Super Contributor
timestamp: June 11, 2021, 11:35:15 am
content: If Intel, or someone else, bought Sifive how much would that affect the RISC-V eco system? Are they key to current RISC-V adoption?

author: hamster_nz
author_rank: Super Contributor
timestamp: June 11, 2021, 10:47:40 pm
content: Quote from: coppice on June 11, 2021, 11:35:15 amI don't think that they are not key, but such a large player could and would definately be able to influence perception.
Component tester, TC T7-H or PEAK Atlas DCA75 pro? - Page 1
Forum section: electronics / general

author: xzswq21
author_rank: Frequent Contributor
timestamp: June 09, 2021, 05:46:34 pm
content: I want to buy a component tester, but I'm skeptical which one I should buy, a Chinese TC T7-H or a British DCA75 pro?Thanks

author: rsjsouza
author_rank: Super Contributor
timestamp: June 10, 2021, 01:21:32 am
content: IMO it depends for what you want to do. The major advantage of the DCA75 is indeed the interface with the PC. If you are interested in just a quick component checker, then the Chinese tester is a much better bang for the buck.At first glance the DCA75 tests a wider variety of devices, but the Chinese has a higher test voltage and current, which skews the tip in its favour.

author: SteveyG
author_rank: Unknown
timestamp: June 11, 2021, 07:10:18 pm
content: The DCA75 is pretty solid, I've not had any battery issues either - the last time I replaced the batteries was about 5 years ago!
Can't install driver for Furuno GNSS Conductor - Page 1
Forum section: electronics / general

author: WPXS472
author_rank: Regular Contributor
timestamp: June 08, 2021, 02:16:40 am
content: Just acquired a Furuno VN-872 and when I installed the GNSS Conductor software to talk to the GT87 GPS, the driver didn't install. I got a message saying the install software couldn't be run on my operating system. Windows 10, in this case. So, I tried compatibility mode and it ran, but failed with a message saying it couldn't be installed. This happened on 2 different PCs, both running Windows 10. The VN872 has a regular serial port, and the documentation says it can be used for communication, but I could not get it to work. The software is supposed to use USB by assigning it a com port number, which it didn't, of course. The GPS seems to be running because it is putting out 1 PPS. I just can't look at anything it is doing, and can't make any adjustments either. I do have an XP machine, but I doubt the software will even try to install on something that old. I can update tomorrow with more detail about the messages I get. Just wondering if anyone has had similar problems. I know the VN-872 isn't a very common gadget, but I thought it worth a try.

author: WPXS472
author_rank: Regular Contributor
timestamp: June 09, 2021, 12:31:06 am
content: Uh, never mind. The problem was Windows 10. It wanted nothing to do with the FTDI drivers. Installed under XP and everything worked fine. That GT87 is one fine GPS receiver. After only a few minutes of operation, it compared favorably to my Thunderbolt. No sawtooth error at all that I could see. Can't wait to slap my GT88 in there and see what it does. Furuno says it is about 3 times better with respect to 1PPS timing.
POP! He’s back!! - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: June 12, 2021, 04:06:18 am
content: https://youtu.be/0mGhhdPgXG8

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 12, 2021, 07:32:31 am
content: https://www.eevblog.com/forum/chat/photonicinduction-passed-away-(unconfirmed)/

author: Ian.M
author_rank: Super Contributor
timestamp: June 12, 2021, 07:42:16 am
content: Quote from: Cyberdragon on June 12, 2021, 07:32:31 amThe above topic was renamed "Andy/Photonicinduction Alive And Well" shortly after it was first posted, when its originator realized he'd been mislead by a vicious Youtube troll.Unfortunately the SMF forum software doesn't (and can't) change the URL when the originator renames a topic as doing so would break all external and cross-topic links to it.TLDR: Andy is 100% fine.

author: Cyberdragon
author_rank: Super Contributor
timestamp: June 12, 2021, 11:09:39 pm
content: Obviously OP understands this, he saw the videos. Just pointing out that it's already a thread. Unfortunate about the URL but as you said, it's permanent now.

author: Ian.M
author_rank: Super Contributor
timestamp: June 13, 2021, 02:27:03 am
content: Yep. However you *could* have linked it as:Code:[url=https://www.eevblog.com/forum/chat/photonicinduction-passed-away-(unconfirmed)/]General Technical Chat: Andy/Photonicinduction Alive And Wellto avoid posting the unfortunate raw URL 'in your face' without an explanation.Now, it matters not as I saw fit to explain the URL to anyone else reading this.N.B. SMF breaks auto-linked URLS if they contain ! (and IIRC some other symbols), and the number of broken URLs that I have see here due to failure to put whitespace after an auto-linked URL, is totally ridiculous, so its as well to be in the habit of explicitly using URL tags in your posts.

author: Red Squirrel
author_rank: Super Contributor
timestamp: June 13, 2021, 03:42:45 am
content: Yes when I posted that I unfortunately fell for a troll who said he was his cousin or something and said he passed away. When Dave did more digging and found it was not true, he changed the title, and I also edited my post to reflect that. No harm was intended by my post, but yeah the URL stayed the same.

author: Bud
author_rank: Super Contributor
timestamp: June 13, 2021, 04:38:14 am
content: Oh no, another thread about that poor guy.

author: Halcyon
author_rank: Unknown
timestamp: June 13, 2021, 04:46:50 am
content: Yes, Andy from Photonicinduction is back. Let's keep the discussion in theexisting thread.
Piezo Technology Inc. VCXO - Page 1
Forum section: electronics / general

author: rockwell
author_rank: Regular Contributor
timestamp: June 07, 2021, 12:05:26 pm
content: I bought a box with used electronic parts.Among these parts is a rather big 30 MHz. wide pull VCXO from Piezo Technology Inc.I searched the internet but I can't find anything about this oscillator.Is there maybe some one who knows the pin connections from this oscillator ?The model number is X01045The oscillator has 3 connection pins and ground or case.
2021 Volkswagen ID.4: Battery Teardown - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 05, 2021, 11:34:59 pm
content: Interesting tear down and info on the design of VW ID4 battery.Maybe not so much as a tear down but a design and construction analysis.

author: Homer J Simpson
author_rank: Super Contributor
timestamp: June 07, 2021, 10:41:37 pm
content: Added motor / gearbox tear down.

author: nctnico
author_rank: Super Contributor
timestamp: June 08, 2021, 09:06:47 am
content: Pfff... more ranting against using screws. And his comment that car electronics aren't being repaired at the component level is simply not true. Even in a small country like the NL there are a few companies that specialise in repairing electronic car modules like ECUs.edit: to me the inverter from VW looks like it has been designed for easy module / component level repairs. They could have filled the entire thing with silicon snot for example.

author: tom66
author_rank: Super Contributor
timestamp: June 08, 2021, 09:15:59 am
content: Every time I watch Sandy's videos, I do wonder why people pay this guy for consulting. He may understand the mechanical engineering aspects quite well but he's clueless about the electronics or systems integrations parts. Making a battery casing from thermoplastics? Come on! Have he not seen the Tesla fire saga?

author: tszaboo
author_rank: Super Contributor
timestamp: June 08, 2021, 10:14:50 am
content: Quote from: tom66 on June 08, 2021, 09:15:59 amIMHO this guy is very opinionated and just clueless in general.The battery pack is made this way, modular so they can configure the car for different battery sizes. It might be even possible to replace the pack per module. The ID3 uses the same modules. There it's more efficient to produce these modules, assemble them somewhere else, not directly into the car, and just slap it together on the production line.He proposes to replace the aluminioum extrusion with polimer. Probably some glass filled plastic. Very hard to recycle, Aluminium (written the correct way) is very easy to recycle.His video is basically how to turn a modular, well engineered battery pack into an unrepairable mess (just like a tesla).I also loved, how he said in the begining that this is worse than the model 3 because it weights more. Weight/capacity is almost the same
How I feel looking at schematics, sometimes... - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: June 05, 2021, 12:47:09 am
content: Classic!

author: retiredfeline
author_rank: Frequent Contributor
timestamp: June 05, 2021, 12:59:07 am
content: xkcd

author: CatalinaWOW
author_rank: Super Contributor
timestamp: June 05, 2021, 01:09:02 am
content: I like it.

author: VK3DRB
author_rank: Super Contributor
timestamp: June 05, 2021, 01:02:04 pm
content: Looks like Dave Cad.

author: PlainName
author_rank: Super Contributor
timestamp: June 06, 2021, 12:13:36 am
content: Quote from: eti on June 05, 2021, 12:47:09 amNot to be a spoilsport, but if you nick someone's work the least you should do is note whose it is.

author: eti
author_rank: Super Contributor
timestamp: June 06, 2021, 01:05:02 am
content: Quote from: dunkemhigh on June 06, 2021, 12:13:36 amI noted who the artist is, on my pad next to me. I won't forget.- don't forget to credit the creator of the font you're typing with

author: GlennSprigg
author_rank: Super Contributor
timestamp: June 06, 2021, 10:09:53 am
content: As a Musician also, imagine how I felt when I found THIS once! hahaha...
Macpro fans - Page 1
Forum section: electronics / general

author: cowasaki
author_rank: Frequent Contributor
timestamp: June 04, 2021, 01:17:47 pm
content: Probably asking the reverse question to most but I have a dead Mac Pro and there a four nice fans in there. I have extracted them but cannot get them to turn. There is a four pin header with ground, VCC, OP and VMSticking 12v and ground into the fan does nothing but there are then two additional pins. Allegedly 2.5-5v to be me of these changes the speed but I can’t get anything to happen with any of the four fans.Any ideas?

author: tooki
author_rank: Super Contributor
timestamp: June 05, 2021, 10:25:23 pm
content: Quote from: cowasaki on June 04, 2021, 01:17:47 pmSay what now?

author: cowasaki
author_rank: Frequent Contributor
timestamp: June 05, 2021, 11:11:48 pm
content: Quote from: tooki on June 05, 2021, 10:25:23 pmI typed this on the phone which has a tendency to mess around with spelling or whole words!Allegedly 2.5-5v on another pin changes the speed but I can’t get anything to happen with any of the four fans.

author: Nominal Animal
author_rank: Super Contributor
timestamp: June 05, 2021, 11:42:51 pm
content: According tothis, the pinout is GND, 12V (VCC), tachometer output (O/P), and Motor Voltage (VM).VCC is used for the tachometer logic, not to power the motor. The motor is actually controlled by a 2V - 12V voltage on the VM pin – this is MUCH wider range than the typical ~ 7V to 12V on 3-pin PC fans. Apparently, for "normal" speeds, VM is about 5V, which, again, is very low for typical voltage-controlled 12V fans. The motor current is drawn on the VM pin (the ones on Mac Pro 5.1, up to 750mA).So, I suggest you try connecting VM to +5V, and GND to ground (these are the two outermost pins), and you should get them spinning at a "typical" speed.(I would not be surprised to find out they're not rated to run at +12V continuously.)
pesky wabbit holes - Page 1
Forum section: electronics / general

author: themadhippy
author_rank: Super Contributor
timestamp: June 01, 2021, 02:41:38 pm
content: Been working on a project for the last week or so.The initial twist and pray / breadboard got me to a working stage,as is usual around here the transfer to pcb didn't go without a couple of hiccups so as always "thou shall check thy voltages" theirs the problem +5v sitting at around 8v and +3v is sitting at 5v,double check id used the right bits in the right holes and decided it must be down to not enough load,lashed in a couple of leds across the power rails remeasure,and no different,stripped the board back to just the power supply and the voltage has gone up slightly.Sod it coffee and fag time.Returned to it this morning ,switched on the meter and the low batterer symbol appears,fitted a new battery back to the circuit, the 5v rail now measures 4.9v and the 3.3v rail is solid at 3.4v,grabbed my other meter which confirmed things put the rest of the circuit back and everything is fine,well apart from the original problem.If only id grabbed my other meter when the reading didn't seem right or even just tested the meter on a know voltage source,an afternoon wasted due to low meter battery's.

author: jmelson
author_rank: Super Contributor
timestamp: June 02, 2021, 04:21:35 pm
content: Quote from: themadhippy on June 01, 2021, 02:41:38 pmYeah, I have a couple Protek meters at home, if the battery is strong enough that the digits can be seen, the reading is within spec. We have a Fluke at work, that the readings go haywire LONG before the low battery flag shows up!Horrible!Jon
New IEEE Open (Access) Journal of the Solid-State Circuits Society (OJ-SSCS) - Page 1
Forum section: electronics / general

author: graybeard
author_rank: Frequent Contributor
timestamp: June 02, 2021, 09:44:39 pm
content: It appears the IEEE feels the winds of the open access journal movement and Solid-State Circuits Society is starting an open access journal. As an author of past papers I received the following message yesterday.Quote

author: Weston
author_rank: Regular Contributor
timestamp: June 03, 2021, 02:21:37 am
content: Its nice that IEEE has open access journals now. I have published in IEEE Open Journal of Power Electronics and its nice that I can share the paper with random people online that are not in academia.However, the IEEE open access journals charge a few thousand dollars to publish (and they do not do any copy editing. I really don't know where the money goes....). They get their pound of flesh either way.I would say the biggest advantage to publishing in the IEEE open access journals is the publication time. My paper took around two months from submission to publication, including one review cycle. A previous IEEE paper took around 8 months and some of the conferences are close to a year between initial digest submission and final publication.

author: Rick Law
author_rank: Super Contributor
timestamp: June 03, 2021, 09:54:53 pm
content: Quote from: Weston on June 03, 2021, 02:21:37 amProp tax? Building cleaning? Snow removal?Quite a nice campus they got in Piscataway, NJ, a couple of miles from Rutgers University Campus. It has to cost a bit of green to keep that much green here in NJ. Your few thousand dollars probably paid for a few milliseconds of operating that facility.See attached Google Map photo...
bios for EM-H8316_178B_v1.0 - Page 1
Forum section: electronics / general

author: klazaridis1
author_rank: Newbie
timestamp: May 31, 2021, 11:58:25 am
content: Hello,does anybody knows how to find the bios for the EM-H8316_178B_v1.0. Is a "motherboard" from the cheap Chinese laptop often called "multilazer","vero" etc I bought a laptop from the marketplace and someone did a shity job, maybe he was trying to change the bios? IDK, the problem was on the keyboard... and now the laptop turns on(the power on led), and the display is off.edit: I found some bios from this site:https://badcaps.net/forum/showthread.php?t=89197but all the bin files are different, so I don't know what to use, I read my bios and it has a lot of difference with these files. I tried to reflash it but when I verified the content it was not the same.Thank you in advance
Cheap Chips for SMT Testing? - Page 1
Forum section: electronics / general

author: fourfathom
author_rank: Super Contributor
timestamp: May 29, 2021, 11:32:58 pm
content: I will probably be getting a cheap Pick and Place unit (perhaps the CHM-T36VA), and am wondering if I can find a source for guinea-pig chips? I don't mind wasting a few spools of 0402 and 0603 resistors, but I don't want to spoil my expensive QFN36 and 48TQFP chips, or some of the more expensive SOT23 and SC-70 parts. Can anyone suggest a source for cheap parts in these packages? This is just for dialing in the physical placement, they don't have to be functional.

author: jmelson
author_rank: Super Contributor
timestamp: May 29, 2021, 11:44:25 pm
content: You might be able to buy small amounts of chips on eBay or Alibaba sort of listing.Jon

author: Miti
author_rank: Super Contributor
timestamp: May 31, 2021, 01:55:37 am
content: You may have solderability issues with random chips from ebay. We use Practical Components.https://www.practicalcomponents.com/
Heat sink Vias on FR4 Vs Aluminum core PCB - Page 1
Forum section: electronics / general

author: alderbaran748159
author_rank: Newbie
timestamp: May 31, 2021, 03:34:35 am
content: Hi everyone,I would like sink the heat from mosfets on a PCB and I am curious about using aluminum core PCB instead of using regular FR4 and add lot of vias to sink the heat from the top to the bottom.I was wondering if it's actually more effective to use an aluminum core, if we compare a FR4 with lot of vias, the top and the bottom are directly connected using copper with a low thermal resistance.Now if we take an alu PCB, there is the dielectric between the copper and the aluminum that might also be low thermal resistance but not as better as copper?!I did not find a lot of info about the comparaison, let me know if you have any experience with alu PCBThanks

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 31, 2021, 02:35:55 pm
content: Which process would this be, one-side build (layups on one side of core only) or two (layups on both sides, insulated thru vias)? Obviously the latter will work better but be careful that it is what you are getting!Tim

author: alderbaran748159
author_rank: Newbie
timestamp: May 31, 2021, 05:07:59 pm
content: I was thinking of this:Regular 2 layer FR4 with vias vs one layer aluminum core

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 31, 2021, 05:21:19 pm
content: But that doesn't have vias...OH, you meant a comma there, the FR4 with vias, versus plain aluminum core? I see!You can run the numbers, take typical footprint dimensions and combine with the specs of the adhesive layer to find thermal resistance.The thermal spreading of aluminum is obviously far higher than FR4. You can apply the same steps (take typical via dimensions, copper plating thickness, copper conductivity, etc.) and derive the values for FR4. It's rather unimpressive, which is why we use metal core for things that need it, like lamps.Additional routing layers tend to be difficult to fab (expensive) so metal core PCBs aren't used so much for power electronics; a single routing layer isn't enough to realize most designs. But it's more than adequate for simple designs like chains of LEDs.Tim

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: May 31, 2021, 05:42:02 pm
content: Quote from: alderbaran748159 on May 31, 2021, 03:34:35 amYes, it's far more effective to use an aluminum core board versus an FR4 board with vias to another copper layer on the other side of the board.
Chinese chip manufacturer startup goes broke - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: May 09, 2021, 04:39:35 pm
content: Chip Scam: China's 15 Billion USD Chip Project Goes Bankrupt | HSMC | Huawei | TSMC| SemiconductorThat's from March this year. Was it already posted here?Incidentally, that huge unfinished development site shown in the video, both as a shiny illustration and actual empty derelict, I recall seeing a video of a couple of urbex guys with a youtube channel exploring it. Is it actually part of the semiconductor scam company saga? Or just some unrelated abandonment the video maker threw in for background visuals?Edit to add: This is the video. But no, it's not the same place.

author: TerraHertz
author_rank: Super Contributor
timestamp: May 30, 2021, 02:03:05 pm
content: ANOTHER one.Chip Scam Ⅱ: Another 10 Billion USD Chip Project Fails in China | QXIC | HSMC | TSMC | SemiconductorMay 28, 2021
Interesting book thread - with links - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: June 27, 2020, 08:53:24 am
content: Hi guys,Over the years I have posted links to a few books that are available for download and are very interesting. Instead of making a new thread each time, I will be adding these links here.The Golden Book of Chemistry Experiments, the book that inspired the legendary David Hahn, so good that it was pulled from the shelves:https://library.sciencemadness.org/library/books/Brent_GBC.pdfThe same site has multiple interesting titles on chemistry, see:https://library.sciencemadness.org/library/On RF Design:https://repository.lib.ncsu.edu/handle/1840.20/36776Not my post, but definitely interesting:https://www.eevblog.com/forum/chat/hp-journal-download/I'll add some later on. If you have any similar links, I will be glad to take a look at them, if you post them hereEnjoy,David

author: daqq
author_rank: Super Contributor
timestamp: May 30, 2021, 12:14:52 pm
content: Interesting resource/library:http://www.survivorlibrary.com/library-download.htmlWhether or not you share the beliefs of the site owner, it seems like a wonderful resource with all kinds of useful knowledge and he deserves a lot of thanks for gathering this kind of library.
SMB Fakra prettiness  - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: May 29, 2021, 12:34:55 pm
content: These are pretty.https://www.digikey.co.uk/product-detail/en/amphenol-rf-division/3FA1-NCSJ-C01W0/115-3FA1-NCSJ-C01W0-ND/11312320?gclid=CjwKCAjwzMeFBhBwEiwAzwS8zPmbTFNpJsnify_-QB966l8EBscgy7MC_ZAN89muU7ibJeIBB-gwaRoC6HIQAvD_BwE
Iffy “smart” bulb;  could you help? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: May 28, 2021, 04:55:16 am
content: Hi. I’ve got one of them fandangled “smart” bulbs which I’ve had about a year, and then a few months ago, when on, say 60-100% brightness on the white setting, two or more pairs of the white LEDs (highlighted) go into strobing mode - about 20hz I’d think. Eventually it stops, but it’s very distracting obviously.I just turned it on at 100% and pressed a couple and they extinguished, but then came back and strobed.Any idea what could cause this - bad psu components? (Capacitive dropper I assume). In anticipation of “just toss it and replace it” - yeah I am aware of that option. Let’s skip the captain obvious please, I’d like to know the weak points of these devices.Thank you so much.

author: alexnoot
author_rank: Contributor
timestamp: May 28, 2021, 05:17:29 am
content: I've had this problem a lot with cheap LED strips from Ebay etc. Cheap components, driven too hard, bad thermal dissipation and so on.The LEDs start to fail after a while. The LED dies are usually a series string of tiny LEDs, so there are many points of failiure. The heat could cause some expansion inside it that breaks the string, then it cools down and reconnects -- free strobe light!

author: amyk
author_rank: Super Contributor
timestamp: May 28, 2021, 01:34:16 pm
content: Bond wire failure is the likely cause.That doesn't look like a cap dropper - the low-value resistors suggest this is a current regulator, probably linear.

author: jmelson
author_rank: Super Contributor
timestamp: May 28, 2021, 06:43:39 pm
content: Inspect the solder joints on the LEDs and resistors in the area of the strobing ones. There might be a bad joint that is actually accessible.Jon

author: nali
author_rank: Frequent Contributor
timestamp: May 28, 2021, 08:43:50 pm
content: FWIW I've investigated intermittent LED failures in matrix panels in a high brightness / high ambient environment and like amyk says it was down to bond wires in the LED itself. I even de-soldered some and hooked them up using magnet wire - and could make them work/fail just by squeezing the resin body with a pair of pliers.
Good quality capacitors New Zealand - Page 1
Forum section: electronics / general

author: HendoNZ
author_rank: Contributor
timestamp: May 25, 2021, 06:18:00 am
content: Anyone know where you can get some good quality capacitors in New Zealand?Looking for something a bit better than you can get at Jaycar. Caps like Panasonic, nichicon and so on.Any help would be great.Cheers

author: TMM
author_rank: Frequent Contributor
timestamp: May 25, 2021, 08:54:53 am
content: Probably best to order online from the usual suspects (Digikey, Mouser, RS components, Element14/Farnell). The cap manufacturers have so many different series/sizes/values/voltages so if a brick and mortar shop stocked them all it would be take up an entire Jaycar sized building and you'd probably be buying stock that has sat on the shelf for 20 years.

author: HendoNZ
author_rank: Contributor
timestamp: May 25, 2021, 10:21:13 am
content: Cheers for the reply.I hear you. I was just looking to see if there was a alternative, shipping costs from those places are huge - If I only need a fee components.Cheers

author: sleemanj
author_rank: Super Contributor
timestamp: May 25, 2021, 11:42:18 am
content: As above, the big players realistically.You could try SICC -https://www.sicom.co.nz/but probably have to call and ask them if they have a name brand

author: HendoNZ
author_rank: Contributor
timestamp: May 27, 2021, 03:10:03 am
content: Quote from: sleemanj on May 25, 2021, 11:42:18 amI've tried them. Sadly they won't tell me what brands they stock - and that I can't order form them (they only do B2B apparently)

author: twospoons
author_rank: Frequent Contributor
timestamp: May 27, 2021, 05:40:30 am
content: I've picked up stuff at the RS warehouse before. You could try that. But if you're driving around Auckland you will spend as much in fuel as getting stuff couriered.

author: coppercone2
author_rank: Super Contributor
timestamp: May 27, 2021, 05:41:37 am
content: i wonder if wool works as a dielectric
(Aus) National Film and Sound Archive offering up some of its int. collection - Page 1
Forum section: electronics / general

author: aargee
author_rank: Frequent Contributor
timestamp: May 26, 2021, 05:29:06 am
content: https://www.abc.net.au/news/2021-05-26/nfsa-giving-away-some-of-its-collection/100165690Hopefully some audiophile will curate the collection.
Crazy 1960s radio transmitters - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 25, 2021, 09:08:14 pm
content: Six of them if the article is accurate. It's from the Encyclopaedia Britannica Book of the Year 1966...I also found this short article about it:https://archive.macleans.ca/article/1965/9/18/broadcasting-your-biteI'm not sure I'd volunteer for this type of nuttiness, couldn't they just glue sensors to a normal tooth and have wires to the outside??And how the heck did they recharge those batteries? Did the volunteer have to stick his head into a 1965 Amana Radarange?I wonder if this really happened or it was just someone's plan at the time, I can't find any corroborating info. If the idea was to have the tooth broadcasting continuously you'd need to be near a receiver and a chart recorder when chewing I suppose. There weren't any IBM 360s that could fit in a tooth in 1965. Right?Anyone ever hear of this??

author: amyk
author_rank: Super Contributor
timestamp: May 26, 2021, 04:16:52 am
content: It seems the original paper for that was titled "The use of Multiple Radio Transmitters in Studies of Tooth Contact Patterns":https://pubmed.ncbi.nlm.nih.gov/14248780/...and while I can't seem to find the full text of the article anywhere, attached are two of the related ones I could find. Yes, this was really a thing back then!

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: May 26, 2021, 05:00:18 am
content: Cool, thanks. I really thought they looked for people to yank a tooth out... Of course it makes more sense to use someone who already has a missing tooth.
Retro Electronic Decorations - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: June 09, 2021, 01:27:01 pm
content: here is someDecoration that does not work or do anythinghttps://www.aliexpress.com/item/1005001359424275.html?spm=a2g0o.productlist.0.0.67d719fcOzgdnp&algo_pvid=7a5b9b1c-279b-4d54-893f-c68aa298d3e7&algo_expid=7a5b9b1c-279b-4d54-893f-c68aa298d3e7-0&btsid=0bb0623916232449346356037e260f&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

author: madires
author_rank: Super Contributor
timestamp: June 09, 2021, 01:40:24 pm
content: A broken used one might be cheaper and looks much more realistic.

author: bob91343
author_rank: Super Contributor
timestamp: June 09, 2021, 04:49:16 pm
content: It would only be realistic if it came from Radio Shack.So while I have your attention, I do have a couple of old boom boxes in the closet so PM me if you have an interest.
Need help identifying this vintage IC - Page 1
Forum section: electronics / general

author: DiddlyJackSquat
author_rank: Contributor
timestamp: May 23, 2021, 08:02:38 pm
content: Found this while I was sorting out my logic ICs and uh, I can't figure out what it is[ Specified attachment is not available ]

author: Benta
author_rank: Super Contributor
timestamp: May 23, 2021, 08:25:15 pm
content: National Semiconductor. Probably with customized marking.

author: themadhippy
author_rank: Super Contributor
timestamp: May 23, 2021, 08:55:00 pm
content: maybe an op amp or 2

author: josh132
author_rank: Contributor
timestamp: May 23, 2021, 09:04:24 pm
content: Get one of those IC tester thingamabobs. It might tell you what is is.

author: DiddlyJackSquat
author_rank: Contributor
timestamp: May 23, 2021, 10:16:23 pm
content: Quote from: Benta on May 23, 2021, 08:25:15 pmThat's what i thought until I tried to google the part number...natsemi 643 doesn't come up with anything nor does LM3532 make any sensebut here's their old logoYup that's right

author: Benta
author_rank: Super Contributor
timestamp: May 23, 2021, 11:04:01 pm
content: I repeat: "customized marking".

author: DiddlyJackSquat
author_rank: Contributor
timestamp: May 23, 2021, 11:48:04 pm
content: Quote from: Benta on May 23, 2021, 11:04:01 pmI should triple check next time, i thought you meant customized natsemi logo

author: amyk
author_rank: Super Contributor
timestamp: May 24, 2021, 12:22:20 am
content: Was there ever an NE3532? Perhaps it's an op-amp?

author: DiddlyJackSquat
author_rank: Contributor
timestamp: May 24, 2021, 05:31:26 am
content: Quote from: amyk on May 24, 2021, 12:22:20 amIts definitely from the 80s... a whole lot of chips and transistors was bequeathed unto me and the previous owner used to do audio repair so these could be anything as I have seen strange driver chips like these in the boxhttps://www.radiomuseum.org/tubes/tube_ay-5-8100.html

author: amyk
author_rank: Super Contributor
timestamp: May 24, 2021, 07:21:08 am
content: That is not a tubeHere's the datasheet for that one:http://www.supermoduul.com/PDF/AY%205%208102.pdf

author: magic
author_rank: Super Contributor
timestamp: May 24, 2021, 01:41:36 pm
content: It may be from early '70s because the 1977 NS transistor databook already uses their later logo.Test every pair of pins in diode mode in both directions and see what happens. The pin which has a PN diode to many (not necessarily all) other pins is likely ground.

author: DiddlyJackSquat
author_rank: Contributor
timestamp: May 24, 2021, 05:53:59 pm
content: Quote from: amyk on May 24, 2021, 07:21:08 ami do know that's the datasheet but that's how radiomuseum hyperlinks themQuote from: magic on May 24, 2021, 01:41:36 pmonly one pin has a PN diode to another

author: magic
author_rank: Super Contributor
timestamp: May 25, 2021, 07:55:32 am
content: That could be a bandgap shunt reference but I'm not sure if National made anything like that in DIP8 at the time.Which pins are connected with the diode?I just tested µA741, NE555, UC3842 and LM358 and sure enough, they all have multiple diodes.