hybridfree/eevblog-posts huggingface dataset:
What DCDC VRegs have a constant current limit feature? Its hard to search for it - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: November 02, 2020, 10:26:01 am
content: I'm looking for a little monolithic DCDC VReg chip but I'm having trouble finding an all-in-one IC solution that fits my requirements.Anyone know a chip that has the following specs?- My main requirement, (the one causing issues), is a built-in constant current regulation feature.I want it do CC mode at around 3A with the output going down to a few volts in CC mode.I have found some chips that have CC mode, but they sense current in the ground line. For my application input and output ground must be common.- Built-in switching mosfet- Input 12/24v system, so needs to be spec'ed to run up to 32V- Output regulated to 15V (if Vin high enough)- Step-down (or could be step-up/down)- Ideally automotive rated spec- Price per chip can be high-ish, if needed. $8 each at 100pcs is not out of the question.Any recommendations welcome.

author: daqq
author_rank: Super Contributor
timestamp: November 02, 2020, 10:49:17 am
content: Could this work?https://www.analog.com/media/en/technical-documentation/data-sheets/3477fd.pdfedit: See page 14 for higher voltage operation.

author: Psi
author_rank: Super Contributor
timestamp: November 02, 2020, 10:57:22 am
content: Quote from: daqq on November 02, 2020, 10:49:17 amSadly the circuit on page 14 that allows higher voltage operation removes the common ground between input and output.

author: tom66
author_rank: Super Contributor
timestamp: November 02, 2020, 10:59:18 am
content: You could implement this function by driving the FB line of many conventional DC-DC converters with an external op-amp. That op-amp could use a high side current sensor (e.g. Zetex ZXCT10xx) to monitor output current. If you use a diode to OR your feedback signal, then you could have CV/CC operation.I appreciate this is more complex than an off-the-shelf solution but it may end up giving you the most availability.

author: Psi
author_rank: Super Contributor
timestamp: November 02, 2020, 11:02:51 am
content: Quote from: tom66 on November 02, 2020, 10:59:18 amyes, this is my fallback option.I just really want something that's ready to go and am willing to pay a bit more for it.For this project being able to take the example schematic from the datasheet and know it will work first time will be a big time saver. It will require less testing and validation.
AKM factory fire - Page 1
Forum section: electronics / general

author: nudge
author_rank: Contributor
timestamp: November 01, 2020, 12:52:40 am
content: https://www.prosoundnetwork.com/business/akm-factory-fire-shakes-up-pro-audio-industryBad news if you have an AKM ADC/DAC/ASRC or sensor part in your design.QuoteAKM parts are in a lot of prosumer and commercial audio equipment, Akai, RME, Focusrite, Pioneer DJ, just to name a few. Hopefully we see AKM bounce back quickly.
Main eevblog page link to Russian language aliexpress - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: October 27, 2020, 11:19:52 am
content: On the main pagehttps://www.eevblog.com/there is an ad for an Aneng AN8008 multimeter that leads to a Russian language AliExpress "page not found". Not very useful in it's present state.

author: SilverSolder
author_rank: Super Contributor
timestamp: October 27, 2020, 12:49:49 pm
content: Quote from: Circlotron on October 27, 2020, 11:19:52 amSaves you a lot of money though?

author: wraper
author_rank: Unknown
timestamp: October 27, 2020, 12:55:44 pm
content: Link is broken but it's not in Russian. Aliexpress has a very annoying feature of changing language to localized version you visited sometime previously. Also it works inconsistently. You change language manually to English, and after a while Aliexpress greets you in Russian, Italian or some other language again randomly if you visited a localized link of that language previously.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: November 01, 2020, 10:50:24 pm
content: Do not give hints for aliexpress to fix something - they will make it even worse.It is better to get used to old mistakes than to suffer from new ones.

author: Circlotron
author_rank: Super Contributor
timestamp: November 02, 2020, 05:24:02 am
content: Now that i figured out by trial and error how to get the page to display in English, it stays that way every time. But still no link to the Aneng AN-8008 multimeter. That page is gone.
US mobile phone service in the 1940s - Page 1
Forum section: electronics / general

author: AlbertL
author_rank: Regular Contributor
timestamp: November 02, 2020, 01:04:59 am
content: This Bell System film shows how the system worked and the equipment used:It looks like there were two variants: one had transmit-receive base stations spaced along major highways, while another, for city environments, had multiple receive-only base stations and a single centrally-located high-powered transmitter.Note that the “highway” version faced the same challenge as modern cellular networks: when calling a mobile unit, the location of the unit had to be known accurately enough to select the nearest base station. In this early system, the calling party had to supply that information to the operator, as the film shows when the dispatcher places a call to one of his trucks.I assume neither version had a provision for handoff from one base station to another.
2-pads printer ink chip? - Page 1
Forum section: electronics / general

author: bitwelder
author_rank: Super Contributor
timestamp: November 01, 2020, 05:38:11 pm
content: I was recently replacing the toner cartridge of my Oki laser printer.Looking at the 'smart' ink chip on it, it's a 6-pins SMD chip (SOIC-6 perhaps?) with only 2 pins connectedto external pads on the tiny PCB.With only 2 terminals, how does in general such a chip work?Is the exchanged data encoded in the supply voltage, or does it communicatein some other way, e.g. a Hall (or other magnetic field) sensor?

author: ebastler
author_rank: Super Contributor
timestamp: November 01, 2020, 07:13:28 pm
content: One solution is commercially available as "1-Wire", by Dallas Semiconductor.https://en.wikipedia.org/wiki/1-WireIt charges a capacitor to buffer the supply voltage while serial data communications are underway.

author: daqq
author_rank: Super Contributor
timestamp: November 01, 2020, 07:32:03 pm
content: There are a few standards that allow communication and power over a single wire + GND. 1 Wire or the Microchip standard:http://ww1.microchip.com/downloads/en/DeviceDoc/AT21CS01-AT21CS11-Data-Sheet-DS20005857D.pdfThere are actually crypto authentication devices that enable single wire communication, can't remember which devices, designed precisely for this situation.
See all my posts? - Page 1
Forum section: electronics / general

author: aneevuser
author_rank: Frequent Contributor
timestamp: October 30, 2020, 02:24:14 pm
content: Maybe I'm missing something obvious, but I can see no way to get a list of all of the posts that I have made, or threads that I have started, through the links available at the top of the page. Do these exist?

author: oPossum
author_rank: Super Contributor
timestamp: October 30, 2020, 02:26:30 pm
content: Profile, Summary, Show Postshttps://www.eevblog.com/forum/profile/?area=showposts;u=176220

author: aneevuser
author_rank: Frequent Contributor
timestamp: October 30, 2020, 02:46:55 pm
content: Thanks. It's slightly hidden though, so I don't feel quite as dim as I might have done.

author: ataradov
author_rank: Super Contributor
timestamp: October 30, 2020, 04:41:48 pm
content: A slightly shorter way. Click on a user name on any of the posts. Then on the left under the user name you will see "Show Posts", "Show Stats".

author: andy3055
author_rank: Super Contributor
timestamp: October 31, 2020, 01:27:35 am
content: I simply do a search for my login name and select entire site.
question electrostatic discharge microSD - Page 1
Forum section: electronics / general

author: classicsamus87
author_rank: Regular Contributor
timestamp: October 28, 2020, 10:48:47 am
content: Do microSD cards also suffer from electrostatics through handling and touching the gold contacts?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 28, 2020, 10:14:50 pm
content: Yes?Specifically: SD Card Association,Part 1: Physical Layer Specifications, Section 6.8.The document is free (I think?) but you will have to register to access it.Tim

author: classicsamus87
author_rank: Regular Contributor
timestamp: October 29, 2020, 10:16:02 am
content: NOTE: This message has been deleted by the forum moderator Halcyon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is: Completely pointless and repetitive.

author: classicsamus87
author_rank: Regular Contributor
timestamp: October 30, 2020, 11:45:15 pm
content: NOTE: This message has been deleted by the forum moderator Halcyon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is: Completely pointless and repetitive.

author: Halcyon
author_rank: Unknown
timestamp: October 31, 2020, 12:52:50 am
content: @classicsamus87- If you aren't going to make a meaningful post, don't post at all. You've already been flagged as a potential spammer. If this keeps up, you will be banned.
Hallowe'en oscillofuns? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 31, 2020, 04:08:43 pm
content: For giggles I want to display some sort of pumpkin or monster animation on my Tektronix 547 big box scope, and shove it in the window.Something like thishttps://giorgiomagnanensi.com/all-hallows-eve/I can't seem to rip or download mp3 from this one. Does anyone have a better search term or maybe have a Hallowe'en themed oscillofun they know of?
Component Identification help - Page 1
Forum section: electronics / general

author: andrevamp9297
author_rank: Newbie
timestamp: October 29, 2020, 03:13:54 pm
content: Hi thanks in advance for you help,I have a component (I believe it is a thermistor. Can you confirm) de soldered from a device. Could somebody help me identify the type of thermistor and suggest a method/procedure to identify the resistance ?Also on close examination I found that the there are two thermistor connected in series with each other. Could somebody guide me to find the values ?I am enclosing the picture . On one of the thermistor it is written as "151" and on other as "52 56"Thanks again

author: Jetecnet
author_rank: Contributor
timestamp: October 30, 2020, 02:20:43 pm
content: 151 in a sot23 is likely an NXP KTY82/151 Silicon temp sensor
112c798e8990347eb4fb45c2dcc5b1fb - Page 1
Forum section: electronics / general

author: barycentric
author_rank: Newbie
timestamp: October 30, 2020, 09:00:06 pm
content: 7fbdbfd9bbb818be689bc884177d4a297ea3c2593288567127eee2b0bcdd3e5f683aff49509087685c36d4209de6b3209bb1d578912e76078b0ca4665f428517

author: TimFox
author_rank: Super Contributor
timestamp: October 30, 2020, 09:12:34 pm
content: At 4:12 PM CDT, Mouser is up.

author: jeffheath
author_rank: Regular Contributor
timestamp: October 30, 2020, 09:14:00 pm
content: They're up for me too, but I haven't tried checking out.
Right to repair in Australia - hope yet. - Page 1
Forum section: electronics / general

author: aargee
author_rank: Frequent Contributor
timestamp: October 29, 2020, 09:30:28 pm
content: The ACCC has taken up the Right to Repair cause here in Australia, as much as the ACCC is a toothless tiger, we live in hope that the government listen.Tractor repair (John Deere et al) is at the top of the list but it extends to all forms of repair, and the tractor situation may just get the whole idea over the line.https://www.abc.net.au/news/2020-04-19/right-to-repair-tractors-taken-up-by-the-accc/12156196

author: jpanhalt
author_rank: Super Contributor
timestamp: October 29, 2020, 09:43:15 pm
content: I am with you. If the repairs are totally free, then the OEM has control. After that, the owner has as much right to repair as any service station.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: October 29, 2020, 10:38:10 pm
content: Quote from: aargee on October 29, 2020, 09:30:28 pmWish Professor Allan Fels was still running the ACCC. He was really good.
www.fseyirci.com fraud - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: October 28, 2020, 10:37:16 am
content: We just noticed that our ASA100 product is up on this obscure websitehttp://www.fseyirci.com/electron-plus-asa100-analog-signature-analyser-vi-tester-curve-tracer-p-741113.htm- we definitley aren't selling via 3rd parties or at this price. No contact infomation/address/email address available to ask them.Not quite sure what to do about this or even if we can do anything?

author: fcb
author_rank: Super Contributor
timestamp: October 28, 2020, 11:00:05 am
content: There seems to be a few websites out there doing this. Although the funniest thing I've found so is:https://rocketreach.co/ben-fisher-email_53270101Obvs scraped off LinkedIn, and the pic is one of my LinkedIn contacts.

author: nctnico
author_rank: Super Contributor
timestamp: October 29, 2020, 10:52:25 am
content: Order one and see. Likely it is a clone.BTW the layout of Fseyirci website is identical to that of the German electronics & gadgets seller Conrad (which has been in business for many decades).

author: ChristofferB
author_rank: Frequent Contributor
timestamp: October 29, 2020, 11:21:04 am
content: I've noticed this too, suddenly a site, forgot the name, appeared after a few weeks of heavy searching for certain NIM modules, that had a lot of listings cloned from Ebay. Note that the category trees are identical to ebay's as well.Too bad I lost the name.

author: fcb
author_rank: Super Contributor
timestamp: October 29, 2020, 01:06:39 pm
content: Quote from: nctnico on October 29, 2020, 10:52:25 amIt crossed my mind it could be a clone. But as the website appears to be 41 days old my guess is fraud:https://www.aetrustscore.com/listing.php?website=fseyirci.com

author: tooki
author_rank: Super Contributor
timestamp: October 29, 2020, 04:46:51 pm
content: It won’t even load now. Server not found. Downforeveryoneorjustme.com agrees.
The Calculator Wars: A video history of Japan's electronic industry (Part 3 - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 25, 2020, 08:28:44 pm
content: YouTube recommended this to me and besides being pretty cool, you get to see a circa 1980 assembly line for calculators. Sweeeeet!

author: edy
author_rank: Super Contributor
timestamp: October 26, 2020, 05:38:49 pm
content: Thanks for sharing, that was a very interesting retro documentary to watch. We take so much for granted today and quickly forget how hard these giants worked before us to get us here. Those retro-commercials were also hilarious!

author: RoGeorge
author_rank: Super Contributor
timestamp: October 26, 2020, 06:05:16 pm
content: Nice, thanks.All the 4 parts of the documentary "A video history of Japan's electronic industry":Birth of The Transistor (Part 1)Circuits in stone (Part 2)The Calculator Wars (Part 3)The technologial giant of the micron world (Part 4)

author: tooki
author_rank: Super Contributor
timestamp: October 26, 2020, 10:06:54 pm
content: Quote from: RoGeorge on October 26, 2020, 06:05:16 pmI watched those a few years ago, great series. Probably about time to watch them again!
Has anyone hacked the Panasonic call blocker? - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: October 28, 2020, 08:31:27 pm
content: I have had a Panasonic KX-TGA710 call blocker (https://shop.panasonic.com/cordless-corded-telephones/cordless-corded-telephones-accessories/KX-TGA710.html) for 2 weeks, and so far, it works great. I have not opened it yet to see what memory it uses.Has anyone done that to read the pre-programmed blocked numbers and potentially update them? Can additional memory be added?I do not like the big red "block call" button. It seems a bit theatrical, but it works, and this model is a lot cheaper than other models.
CREE has sold LED division to Smart Global Holdings - Page 1
Forum section: electronics / general

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: October 25, 2020, 10:55:58 pm
content: https://epsnews.com/2020/10/23/cree-divests-led-business-to-focus-on-sic-and-gan-devices/For those that have experienced something similar in the past, what would this mean for CREE's current LED lineup?

author: rdl
author_rank: Super Contributor
timestamp: October 25, 2020, 11:38:36 pm
content: I didn't know Cree had any other businesses besides making LEDs. After reading that article, it seems they probably made the right move.

author: tooki
author_rank: Super Contributor
timestamp: October 26, 2020, 12:52:07 am
content: Quote from: ANTALIFE on October 25, 2020, 10:55:58 pmA better question is: which semiconductor companieshaven’tbeen divested at least once in their lifetimes? TI... Intel... umm...

author: HwAoRrDk
author_rank: Super Contributor
timestamp: October 26, 2020, 11:03:36 am
content: Quote from: tooki on October 26, 2020, 12:52:07 amWell, Intel are planning to sell off their memory business to SK Hynix, so the list is becoming increasingly small...

author: fourtytwo42
author_rank: Super Contributor
timestamp: October 26, 2020, 06:48:36 pm
content: Are this bunch asset strippers or technology thieves I wonder ?
how do I know this tip is genuine - Page 1
Forum section: electronics / general

author: mikemag
author_rank: Newbie
timestamp: October 24, 2020, 11:34:08 pm
content: I know there are a lot of fake Hakko tips out there sold from China. This seller has sold a lot of them and is in California.but are they genuinethe price is quite good if I am buying just one tip so I am suspicious.....https://www.ebay.com/itm/HAKKO-A1006-1-3MM-DESOLDERING-NOZZLE-FOR-802-808-809-807-817-NEW/254646430233?epid=3019269750&hash=item3b4a1c2a19:g:7UUAAOSw849d4kWnhttps://www.ebay.com/itm/HAKKO-A1005-1-0MM-DESOLDERING-NOZZLE-FOR-802-808-809-807-817-NEW/254710016331?hash=item3b4de6694b:g:sMAAAMXQNOZRDtBi
New (near) room temperature superconductor!  But with a caveat. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: October 24, 2020, 12:05:39 am
content: New (near) room temperature superconductor! But with a caveat. Were getting close....

author: cdev
author_rank: Super Contributor
timestamp: October 24, 2020, 01:35:58 am
content: I want that ambient cooling paint for my roof.

author: BrianHG
author_rank: Super Contributor
timestamp: October 24, 2020, 02:39:11 am
content: Quote from: cdev on October 24, 2020, 01:35:58 amNot only for my roof, If I were to buy an EV, for my car as well.
Future of Electronics & Robotics on the Bench - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: October 23, 2020, 10:14:33 am
content: ahypotheticalpost about the future of possible robotics in the electronics leb.operation and use of robotic arms to stop or eliminate all human tremorsin the hands or shake. particularly with the use of high magnification in small spaces.particularly with aftermarket and repair work. were human input is still needed.here is a video about a high magnification 3D robotic systemThe da Vinci Surgical System is a robotic surgical systemmore about the da Vinci surgical systemnow just imagine if you had a similar but somewhat less expensive robotic system for the electronics leb.robotic soldering station with test probe & test equipment integrationparticularly for repetitive surface mount pcb repair & or testing.be interesting to know if you have ever considered getting your electronics leb or work space automated?to save time or eliminate human physical weaknesses.repetitive strain injury (RSI) or repetitive eye strain.okyourwithout referring to any existing developed for soldering, or particularly of electronics product & or service is a bit too mushfor most people to comprehend, the future of anything by speculatingwhat may or may not happenor service or things that haven't been invented yet.themedicalrobotic surgical system seen in the video, is an example of how a hypothetical robotic product.or service or things that haven't been invented yet. or existing robotics can be adapted or modified for use in theelectronics industryparticularly with aftermarket and repair work were human input is still needed.that's all folks

author: Pack34
author_rank: Frequent Contributor
timestamp: October 24, 2020, 12:42:55 am
content: I use that daily. I don't see the application to the electronics lab. Ramping down the sensitivity helps with keeping the manipulator steady, but reflow is superior for rework and assembly. Tin both and hit with heat. Surface tension will handle the heavy lifting for you.
U.S. Justice Department files antitrust lawsuit against Google - Page 1
Forum section: electronics / general

author: Bud
author_rank: Super Contributor
timestamp: October 20, 2020, 05:21:58 pm
content: This one will be interesting to watchhttps://www.cbc.ca/news/business/google-antitrust-1.5769105

author: fourtytwo42
author_rank: Super Contributor
timestamp: October 26, 2020, 06:44:14 pm
content: About time too, there voracious appetite for my personal details is a complete pita and mores the pity some stupid regulatory incompetents allowed them to takeover Youtube that has now become unusableHowever it would seem most are social media users and do not understand this exploitationMicrosofts destruction of Skype is a similar exampleOf course I don't expect anything to happen in my lifetime but at least it may serve to open some peoples eyes.
Alternative Math (Joke) Morale... - Page 1
Forum section: electronics / general

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 14, 2020, 07:40:25 pm
content: at boring time (after brain saturated with hobby work) i watch short sci-fi movies, and then this one caught me...2+2=22... in the end she should have said 2000+2000=20,002,000, not 22,000.. joke aside, there are certain things thats happening in real life in this world are viewed as or subject to "subjectivity", different places with different views, in the end long after will lead to bad consequences, but unfortunately they are unable to relate with what has happened in the past, like the judge/admin said in the video... "they themselves brought this to themselves"... there are certain "absolution" that they just cant admit... cheers.

author: spudboy488
author_rank: Regular Contributor
timestamp: October 15, 2020, 12:28:15 pm
content: I'm a weekend watcher of this genre as well and just saw this one. Great ending.Side note, look for the Dust and Omeleto channels. Both have a lot of offerings that fit your short sci-fi interests. Dust is my favorite.

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 15, 2020, 12:56:27 pm
content: all dust films that popped up when i make a search i've watched them all and most of the time i got super dissapointed because they are too short before i can understand anything. my youtube google now is "sci fi award winning" much more understandable plots, if i want to vote something i'll vote "the surface" its the most complete "short movie" i've ever seen and the moral is among the best...

author: Microdoser
author_rank: Frequent Contributor
timestamp: October 19, 2020, 03:22:36 pm
content: There are 10 types of people. Those that understand Binary and the ones that don't.

author: edy
author_rank: Super Contributor
timestamp: October 20, 2020, 01:58:58 pm
content: Very funny... I just watched "Idiocracy" and this is how it must have got started.
SK Hynix to buy Intel's NAND business - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: October 20, 2020, 03:09:02 am
content: Reuters ->South Korea's SK Hynix to buy Intel's NAND business for $9 billion"The move marks the latest effort by the U.S. chip giant to divest its non-core businesses, move away from the volatile commodity NAND chip industry and focus on its remaining memory business, Optane."
Your favorite cables and why - Page 1
Forum section: electronics / general

author: Muffins
author_rank: Regular Contributor
timestamp: October 19, 2020, 10:45:15 am
content: I was looking around for what kind of wire harnesses guys are using to route hardware to boards inside machines. I'm busy with a project that uses Teknic servo motors. These have molex minifit jr connectors on them that definitely aren't the worst connectors to work with but can be a pain in the butt to make up and install, especially when the mating connector is not visible or is in a tight spot. Anyway I feel like I don't have a good solution for this and in general I find wiring things together to be difficult, time consuming and sometimes confusing.What kind of wiring you guys come across in your work and do you have any opinions and preferences regarding it?

author: rdl
author_rank: Super Contributor
timestamp: October 19, 2020, 06:41:00 pm
content: For inside an enclosure I will use IDC type (with flat ribbon cable) if at all possible. I have occasionally used Molex SL, but stripping and crimping individual wires tends to get annoying. I'm only doing things at a hobby level, so I don't have an expensive crimper tool.
Experience Hassle Free Shifting With Movers And Packers - Page 1
Forum section: electronics / general

author: easymysearch
author_rank: Newbie
timestamp: October 23, 2020, 07:40:23 am
content: NOTE: This message has been deleted by the forum moderator Halcyon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is: Spam belongs in a can, not on this forum.

author: Halcyon
author_rank: Unknown
timestamp: October 23, 2020, 07:59:10 am
content: There we go, much better company logo. ;-)
Interesting "IC" - QFN SMD battery  - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: October 14, 2020, 09:19:59 pm
content: OK, not exactly something you can run your Tesla off of, but nice and small. Good for RTCs I guess:https://www.cymbet.com/products/enerchip-solid-state-batteries/

author: amyk
author_rank: Super Contributor
timestamp: October 17, 2020, 07:44:08 pm
content: QuoteWhat utter BS. Now the "life of the product it powers" is going to be limited by the life of the (very difficult to replace) battery.

author: ConKbot
author_rank: Super Contributor
timestamp: October 18, 2020, 07:54:32 am
content: QuotePretty bold to call it 50uAH if only 5uAH is usable without trashing the battery.

author: Nominal Animal
author_rank: Super Contributor
timestamp: October 19, 2020, 05:01:16 am
content: Quote from: ConKbot on October 18, 2020, 07:54:32 amAnd how marketing-wankery of them to use "at a 10% depth of discharge" in the hopes of readers believing they meant "to a 10% state of charge".At least the datasheet says "Charge/discharge cycles: > 5000 times at 10% discharge", which is clearer and less wankery. And lower down, they do admit that at 40°C, only 500 charge/discharge cycles at 50% discharge.The only use case I can think of these is when you have a bare die on your board under a blob of epoxy, and want to hide a small battery for RTC/RAM backup there to keep some Super-Secret SauceTMlike the most important one, License/Warranty Expiration Date. You know, to "optimize" device life.

author: hans
author_rank: Super Contributor
timestamp: October 19, 2020, 09:51:51 am
content: I think these devices can be interesting, but only for a very niche case. Compared to supercaps at these small dimensions,you can get a few kind of 11mF caps in 1210, but their energy density is an order of magnitude off. At least on paper.., if you don't look at recharge cyclesNot sure if that cell series resistance is anything to be happy with. 5k ohm at 1k cycles, 10k nominal at -20C, ouch! Good luck pulling a few ten uW of a battery in bursts for anykind of energy harvesting/IoT application..

author: SiliconWizard
author_rank: Super Contributor
timestamp: October 19, 2020, 04:59:31 pm
content: Yeah, those solid-state batteries have been around for a few years now. They never really took off. A few companies designing them even went bankrupt or just discontinued them.When you look closely at the specs, it's not hard to understand why.
Simple request: need a 6000 count DMM from Amazon UK (delivered today) - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: October 14, 2020, 03:35:59 am
content: {bought HT118A £16 delivered}ThanksGot Amazon Prime, need a 6000 count DMM delivered tonight via prime (there's a few, I'm looking at HT118A) - am no one's fool, abundantly aware that the torrents of "reviews" Amazon churns out are of as much worth as a wax kettle.So... I'm here seeking advice from those whom have amassed vast collections of DMMsOh and my budget is £30 UK.Muchos GravyBoats.

author: MosherIV
author_rank: Super Contributor
timestamp: October 14, 2020, 07:02:49 am
content: Apprently Amazon sell a clone of the UT139Chttps://www.eevblog.com/forum/testgear/new-trms-uni-t-ut139c-dmm-is-available-now/msg2261307/#msg2261307

author: eti
author_rank: Super Contributor
timestamp: October 15, 2020, 09:00:06 pm
content: Thanks for the input. I got me a "Kaiweets" (straaaaange name...) HT118A - I can't work out how to measure 200Khz or 5Mhz with it, though, I seem to get no reading. Maybe I am missing something - why are there "Hz" markers on multiple range switch selections?

author: tom66
author_rank: Super Contributor
timestamp: October 15, 2020, 09:16:33 pm
content: The frequency count function on most multimeters is a toy at best. Use a real universal counter, or an oscilloscope if precise frequency measurement isn't critical. For one, the thresholds and amplitudes are rarely well controlled, and their behavior on complex inputs (with more than just a fundamental) is also poorly defined.

author: eti
author_rank: Super Contributor
timestamp: October 15, 2020, 10:25:44 pm
content: Quote from: tom66 on October 15, 2020, 09:16:33 pmYep, I got that impression. However, seeing as the feature is there, I'd still like to use it, and so how would I achieve that please? Thanks.

author: tooki
author_rank: Super Contributor
timestamp: October 15, 2020, 11:49:06 pm
content: Quote from: eti on October 15, 2020, 09:00:06 pmLook at the product images on Amazon or Aliexpress carefully, I bet you can figure it out!

author: eti
author_rank: Super Contributor
timestamp: October 15, 2020, 11:56:25 pm
content: Quote from: tooki on October 15, 2020, 11:49:06 pmYes, sorry, that was excessively lazy of me!

author: tooki
author_rank: Super Contributor
timestamp: October 16, 2020, 12:00:42 am
content: Did you figure it out now?

author: eti
author_rank: Super Contributor
timestamp: October 17, 2020, 01:00:59 am
content: Quote from: tooki on October 16, 2020, 12:00:42 amNot yet, although I now have a somewhat more troubling issue with the HT118A... contrary to YouTube teardowns etc, the rear of my unit has ZERO access holes through which to facilitate the insertion of a screwdriver to remove the back and replace fuses etc... (On the YouTube review units there appeared to be four holes, one per corner on the rear) but on mine it's over-moulded with what seems to be a PERMANENT flexible shroud which is non-removable ...Absolute genius! Back it goes
paint for repairing solder mask - Page 1
Forum section: electronics / general

author: vivi-d
author_rank: Regular Contributor
timestamp: October 19, 2020, 05:44:20 pm
content: Hi, I do occasional PCB repair at my current workplace. We have some tools and processes in place, but there is always room for improvement. I've, in a sense, inherited this task...What I'm really looking for is something less messy than UV cured solder mask. The stuff we have now just oozes everywhere and is a pain in the butt to work with. Would it violate IPC (or form, fit, function) to use something more like paint? Such as what is used to paint miniatures for WarHammer?Please share your thoughts!

author: Microdoser
author_rank: Frequent Contributor
timestamp: October 19, 2020, 05:50:03 pm
content: I have read that enamel paint like you would paint miniatures with, has a high electrical resistance. I have been told to cover bare solder points on high voltage LED strips with it to stop shocks if you handle it when live.I do not know whether it would resist solder though and I suspect it would not look as good as solder mask paint designed for the job.

author: Fgrir
author_rank: Regular Contributor
timestamp: October 19, 2020, 06:25:20 pm
content: I've used these in the past with good results:https://www.chemtronics.com/circuitworks-overcoat-pensI've also used clear acrylic nail polish in a pinch, but not sure I'd use that professionally.

author: vivi-d
author_rank: Regular Contributor
timestamp: October 19, 2020, 07:46:42 pm
content: I've tried the overcoat pens, but they always seem kind of runny. I think I'll experiment with the enamel based miniature paint. I just want to brush it onto the PCB using a microscope. That way I'll have more control.

author: ajb
author_rank: Super Contributor
timestamp: October 19, 2020, 07:54:07 pm
content: You can also get UV-cure solder mask in syringe cartridges that should be fairly close to the sort of material that's used during normal manufacture. I bought some cheap stuff on amazon a while ago just to have on hand in that style but haven't used it much. Amusingly it included a "UV" flashlight which was just a bog standard white LED job that obviously didn't do shit to cure the mask material, but fortunately I have other UV lights on hand that will do the job.
Yahoo Group is Shutting Down Bring all Your Bag Come Down Here... - Page 1
Forum section: electronics / general

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 14, 2020, 12:17:23 am
content: i got a message...Quote from: Yahooi frequently see members posting giving links to yahoo group on ee materials. so what impact it can be? i believe alot of the ee gems are deep buried down there.

author: Bud
author_rank: Super Contributor
timestamp: October 14, 2020, 05:19:30 am
content: Most of the groups have migrated their content to groups.io , the owners of which were giving you premium account for free if you are anti-Trump. Any guess why they wanted to acquire the massive yahoo groups audience?

author: james_s
author_rank: Super Contributor
timestamp: October 14, 2020, 05:39:11 am
content: I thought Yahoo Groups shut down some time ago?I used to be on several thriving groups and was a moderator on one, they worked well and were very popular. Then Yahoo decided their platform looked dated and revamped everything, in the process completely ruining groups. The new design was so buggy it was unusable and members abandoned them almost overnight fleeing to other platforms. Despite outrage in the community Yahoo steadfastly refused to roll back the changes. Screw Yahoo, they did it to themselves.

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 14, 2020, 12:39:43 pm
content: Here's how to archive the data:https://archiveteam.org/index.php?title=Yahoo!_GroupsQuote from: Bud on October 14, 2020, 05:19:30 amHow do they prove the users really are against Trump?

author: DrG
author_rank: Super Contributor
timestamp: October 14, 2020, 04:44:37 pm
content: Quote from: NiHaoMike on October 14, 2020, 12:39:43 pmApologies, I just could not resist that

author: DeanA
author_rank: Regular Contributor
timestamp: October 16, 2020, 12:59:25 am
content: Quote from: DrG on October 14, 2020, 04:44:37 pmThanks, I needed a good laugh today. lol.

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 16, 2020, 10:35:08 am
content: yeah coincidentally,https://www.eevblog.com/forum/chat/alternative-math-(joke)-morale/?topicscreen... now we have the tool and the method of verification... 4 + 6 = 46 (Trump's supporters).. another method i can think of is islamophobic and Made in USA only. so if you find someone who reviewed or own Made in China T&M, thats a good sign of anti-Trump movement...
Amusing eBay product photos - Page 1
Forum section: electronics / general

author: GnatGoSplat
author_rank: Regular Contributor
timestamp: October 14, 2020, 07:00:13 pm
content: A couple of the product photos for this eBay item made me LOL.https://www.ebay.com/itm/1000W-DC12V-Inverter-Module-High-Frequency-Module-Board-Current-Boost-Step-I9S0/254646230438I mean, I assume they didn't intend to imply it's likely to suffer from transistors and electrolytic caps blowing up.

author: james_s
author_rank: Super Contributor
timestamp: October 14, 2020, 07:10:47 pm
content: Well, I'll give them some credit for being honest.

author: srb1954
author_rank: Super Contributor
timestamp: October 14, 2020, 10:10:42 pm
content: It's a new product feature: factory pre-exploded capacitors and transistors.No longer does the user have to suffer the stress and anxiety of their latest piece of electronic junk exploding at an inopportune time as it is delivered already pre-exploded.

author: tszaboo
author_rank: Super Contributor
timestamp: October 14, 2020, 10:26:16 pm
content: This was the best joke today.Sales guy took all the pictures from the board, including the QC FAIL pile investigation ones.Oh, this is brilliant.
Need Hakko USA discount code - Page 1
Forum section: electronics / general

author: mikemag
author_rank: Newbie
timestamp: October 14, 2020, 06:16:34 pm
content: sorry if this is not the right forum for this question.I need to order some supplies from Hakko USA, I read that if I signed up for their newsletter I would get a discount code. I never did get a code.Does anyone know what the current discount code for Hakko USA is ?thanks
Function Generator Waveforms - Page 1
Forum section: electronics / general

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: October 16, 2020, 08:13:02 pm
content: Nearly every function generator I've ever seen has at a minimum sine, square, and triangle outputs with various modifications thereof. I have a need for sine and square fairly often, but not once have I needed triangle where nothing else would do, especially at higher frequencies. At lower frequency I can see a need for a ramp for timing or level comparison, but that's about it. Please enlighten me to any other common uses for triangle waves.

author: ledtester
author_rank: Super Contributor
timestamp: October 16, 2020, 08:21:58 pm
content: With a triangle wave you can produce a PWM signal where the center of the ON state stays in the same place. This could be useful for certain applications and is called "phase-correct PWM".

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: October 16, 2020, 08:24:44 pm
content: Quote from: ledtester on October 16, 2020, 08:21:58 pmThanks, I like that one.

author: nfmax
author_rank: Super Contributor
timestamp: October 16, 2020, 08:27:16 pm
content: Providing input to characterise a circuit with a non-linear response, such as an optocoupler. Use a scope in X/Y mode, with the X axis showing the input voltage (the triangle wave) and the Y axis the output.

author: bob91343
author_rank: Super Contributor
timestamp: October 16, 2020, 08:31:43 pm
content: I use a triangle wave to create a sweep generator by using it to frequency modulate my signal generator.

author: TimFox
author_rank: Super Contributor
timestamp: October 16, 2020, 09:11:29 pm
content: The traditional analog function generator starts with a triangle wave, then derives the square and sine waves from the triangle. A good analog generator can easily vary the symmetry of the original triangle wave to generate a ramp or non-square pulse waveform.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: October 17, 2020, 12:06:16 am
content: Using a triangular wave allows you to check threshold elements.
are there legal requirements for factory ventilation? - Page 1
Forum section: electronics / general

author: engineheat
author_rank: Frequent Contributor
timestamp: October 14, 2020, 03:51:55 am
content: I wonder if there are legal requirements in the US when it comes to ventilation in factories, specifically regarding how much outside fresh air should be mixed with the indoor air in the HVAC system. What's to prevent a plant from using 100% recirculated air all the time and save money?I understand there are OSHA requirements when there are hazardous particles or chemicals, but I'm wondering in a general sense if there are required minimum % of outside air that factories HVAC must abide by.Thanks

author: NiHaoMike
author_rank: Super Contributor
timestamp: October 14, 2020, 04:09:44 am
content: There is no set number, what matters is making sure the air quality (most notably CO2 and VOCs) stays within acceptable limits. So basically it depends a lot on how much the processes inside are polluting the air.That said, a HRV or ERV will go a long ways to cutting down on energy use in many cases.
2716 ROM replace, can I use flash? - Page 1
Forum section: electronics / general

author: johnsonlam
author_rank: Newbie
timestamp: October 13, 2020, 01:04:35 am
content: Hi,Got an old Apple //e which keyboard ROM seems have some problem, it's an 2716 ROM but it's now obsolete, don't want to buy the Chinese old one, as they maybe fake or fail soon. Remember see some post that can replace with 27C256 (which I have an ATMEL OTP), but how to do this? Seems need an adapter or some pins modified, please advise.Thanks in advance.Rgds,Johnson.

author: edavid
author_rank: Super Contributor
timestamp: October 13, 2020, 02:07:17 am
content: You can use a 28C16, no adapter needed.

author: johnsonlam
author_rank: Newbie
timestamp: October 13, 2020, 02:28:21 am
content: Seems it's obsolete and can't buy from Digikey and Mouser, only AliExpress and eBay have old stock

author: terminus
author_rank: Contributor
timestamp: October 13, 2020, 04:42:24 pm
content: Hi Johnson,did you try to reprogram it? it could simply be beyond the data retention period.wbrvictor

author: Benta
author_rank: Super Contributor
timestamp: October 13, 2020, 05:52:14 pm
content: For an old Apple, it probably a DIP package. Choose some SOIC/SSOIC EEPROM or Flash, use an SO-to-DIP adapter PCB (can be bought ready-made) and you're done.

author: james_s
author_rank: Super Contributor
timestamp: October 13, 2020, 06:49:42 pm
content: I've bought lots of EPROMs from China sellers and haven't had an issue yet, the quartz window ICs will be used pulls in most cases but not fake. The EEPROMs you have to be more careful with, I got burned on some 28xx parts that turned out to be some random IC that had been blacktopped and re-marked.You might also try simply re-programming the EPROM you already have. I've had them fade before and get corrupted and have been able to refresh them in my TL866 and they worked again.

author: greenpossum
author_rank: Frequent Contributor
timestamp: October 13, 2020, 06:51:34 pm
content: For just over a buck a 28C16 is worth risking. If you were local I could send you one I extracted from old equipment. I also have some 2732s. You need a programmer capable of handling the voltages. Otherwise you could make an adaptor from larger (E)EPROMs which are in a 28 pin package rather than 24 pin. You just need to ground the extra address lines. Tedious and you may not have the vertical space.
Spider in PC and related topics - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: October 11, 2020, 07:03:09 pm
content: Today I noticed some cob webs in a pc. I am thinking if spiders were on PCBs they would not be good conductors and mostly not do anything. In the old days when computers were all 5-12V TTL, I am guessing splashing a few volts around would not matter. If signal levels are around 2V, maybe this can be an issue? I don't know if there are really sensitive places, like tuners?In general though I thought people were not conductors, but things became conductors with higher voltages. Is this accurate?

author: TimFox
author_rank: Super Contributor
timestamp: October 11, 2020, 07:11:49 pm
content: There is a large safety literature about electrocution. From my days in MRI, the basic thing I learned about electricity and the human body is that the interior is basically saline (inside a cellular structure) that is fairly low resistance compared with the resistance through the skin, but the skin resistance is a strong function of skin moisture. Back in high school, we played lie detector using only a Simpson 260 in its highest resistance setting, safely measuring the resistance between hands (pinching the probes between thumb and forefinger), to see if lying made the skin sweat.

author: KaneTW
author_rank: Frequent Contributor
timestamp: October 11, 2020, 07:30:03 pm
content: I find it hard to imagine a spider will cause a failure -- it'd have to both touch exposed metal and also touch a part where the resulting current is large enough to cause a significant shift in voltage.As for conductivity, skin is a decent isolator, both due to oils on skin and other factors. Wet or sweaty skin is weakly conductive, and your innards are quite conductive. High voltages will find it easier to basically cause dielectric breakdown (not sure if it's actually dielectric breakdown, but close enough).

author: Syntax Error
author_rank: Frequent Contributor
timestamp: October 11, 2020, 09:30:22 pm
content: Tell your kids it's where theGoogle web spiderlives... in time for halloween.

author: newbrain
author_rank: Super Contributor
timestamp: October 11, 2020, 09:32:26 pm
content: Quote from: KaneTW on October 11, 2020, 07:30:03 pmHave you ever heard of bugs in computers?Not a spider, though.

author: David Hess
author_rank: Super Contributor
timestamp: October 11, 2020, 11:57:05 pm
content: I have encountered a couple of PCs which failed because a mouse moved in.
Supplier packaging of components - Page 1
Forum section: electronics / general

author: negativ3
author_rank: Regular Contributor
timestamp: October 12, 2020, 02:51:49 am
content: Hi all,I recently had a package of small qty components come in to Thailand from Arrow with truly hideous local tax and delivery charges. The two of each component which I had ordered was complete however one IC was packaged in a (90% empty) tube (12-14" long) necessitating a very large cardboard box. If they had all been in per-part packaging, the total package would have been around a postal envelope in size. The crazy charges were due to the package volume, not total $ value, as detailed by the local courier, so for $60 of components, the total bill was close to $140 delivered.Is there any way to formally request minimal component packaging that you know of?Thanks
I need good light on work bench - Page 1
Forum section: electronics / general

author: Jan Audio
author_rank: Frequent Contributor
timestamp: October 10, 2020, 01:26:19 pm
content: Hi, i search for a light for my workbench.I cant find any good ones.I need something that stands above my pc-monitor with 2 feet on both sides, only i dont know how to search for such a model if they still exist.Can you show me what lights you use ( not on the ceiling, on your bench ), and can you tell me how to find it in a shop ?thanks