hybridfree/eevblog-posts huggingface dataset:
Curiosity Killing The Cat - Reverse Engineered Schematics - Page 1
Forum section: electronics / general

author: spsb
author_rank: Newbie
timestamp: April 03, 2022, 02:54:28 am
content: This may of course be a very silly question with an obvious answer to some...But I was curious in knowing about the legality of "publishing" (to a forum) a reversed engineered schematic of the raspberry pi 4?I was surprised and also not surprised to discover that I couldn't get a detailed schematic of said pcb. My reasons are motivated purely by curiosity and started when I ended up with 8 dead rpi4's from a previous job. Started hoping the problem was related so some supporting component failure, I decided looking at doing a diagnosis and repair - despite the obvious bad cost versus outcome, I was more interesting in the learning experience. Then I hit this wall...So. Now I have 8 boards and some time to spare. I wondered if anyone has attempted to do what I am suggesting? And what legal traps one could find along this journey?Any insight would be appreciated, Cheers.

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2022, 03:21:04 am
content: It may depend on what country you're in, but here in the US it's legal to publish a reverse engineered schematic. When you reverse engineer something, you own the results of your work.

author: spsb
author_rank: Newbie
timestamp: April 03, 2022, 03:34:22 am
content: That is very interesting, then why is it so that I can not find any detailed schematics of the rpi4. I am sure there are many smart people in the US (or that rest of the world) that could do this far more quickly than I could, or is it that no one is bothered LOL

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2022, 03:58:57 am
content: I have no idea, certainly I've never bothered. I've never had a reason to.

author: amyk
author_rank: Super Contributor
timestamp: April 03, 2022, 04:15:25 am
content: The RPi "community" has always been full of people who aren't bothered by Broadcom's infamous closedness, so it's probably the case that no one cared enough to do it.Maybe you can make a working one out of the 8 dead ones?

author: james_s
author_rank: Super Contributor
timestamp: April 03, 2022, 04:22:13 am
content: I don't like Broadcom's closedness but I also have never needed a schematic for a RPi. I've never had one fail and I wouldn't bother trying to build one myself even if I could get the parts. It's little more than a breakout board for the SOC, I don't expect a schematic to be all that interesting so I've never had a reason to try to locate one. More often than not when I fix something I don't have a schematic for it, it's a rare luxury when there is one.

author: sequoia
author_rank: Unknown
timestamp: April 03, 2022, 06:23:42 pm
content: Interesting, I've only looked Pico schematics in the past... Indeed looks like for Pi there seems to be only "reduced" schematics available:https://www.raspberrypi.com/documentation/computers/raspberry-pi.html(is there something else "missing" from these than details on the Broadcom SoC?)
AUSTRALIA: New Budget Business Tax Incentives  - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 30, 2022, 02:12:08 am
content: The Australian budget just dropped:QuoteI heard about it here but need to check full detailhttps://www.myob.com/au/blog/federal-budget-2022-taxes-cashflow-and-write-offs/Wondering if there is anything I've been holding off doing that could make this a bit more worthwhile, like maybe upgrading my website, or moving this server to the cloudThere used to be (still is?) a 150% R&D tax concession, but the amount of paperwork made it an unpleasant experience. Not sure if this one will be the same.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: March 30, 2022, 02:26:36 am
content: Say you invested in web development. How does the above scheme work in terms of accounting for the actual deductions?

author: EEVblog
author_rank: Unknown
timestamp: March 30, 2022, 03:31:01 am
content: Quote from: AntiProtonBoy on March 30, 2022, 02:26:36 amWeb development (and anything else business related) would already be 100% tax deductible. Now it would be 120%.So if I spent $1000 then I can claim $1200 as the expense. So $200 extra comes off my taxable income. Which of course is not the same as getting $200 back, it's way less than that.Presumably there will be some form you have to fill in (or some accouting category) to state that this expense meets the new rule category.
Typical accepted trace temperature rise - Page 1
Forum section: electronics / general

author: MathPi
author_rank: Newbie
timestamp: March 28, 2022, 08:21:34 pm
content: Hi All,I tried searching through the forum but couldn't quite find what I am looking for. When designing PCB and calculating current rating for a given trace (let's say a trace on an outer layer), what is a typically accepted temperature rise? Reading through other forums/blog/online I see a large range anywhere between +10C to +85C. I'm thinking 20C is a good reasonable temp increase, but can't quite find anything to confirm/deny that. If ambient temp is 25C and trace increases in temp by 20C, then the result is 45C, which isn't going to burn the user if they touch it. I realize that the components nearby the trace will play a factor in this consideration, but for my particular application let's assume the trace is stand-alone trace without anything else nearby it. Looking for a rule of thumb, etc. Any user experience out there?Cheers,MathPi

author: Vovk_Z
author_rank: Super Contributor
timestamp: March 29, 2022, 01:53:37 pm
content: Possibly, it depends on your design restrictions and reliability/size ratio.As I know, for a commercial design 70 C is not a high temperature.What a design it is where a user is allowed to touch parts and PCB?

author: TimFox
author_rank: Super Contributor
timestamp: March 29, 2022, 02:02:30 pm
content: Important question: at what temperature is there a risk of copper delamination from the substrate?
Any Problems with Smaller Chip Process?  - Page 1
Forum section: electronics / general

author: msuffidy
author_rank: Frequent Contributor
timestamp: March 27, 2022, 03:18:38 am
content: Are there any issues with making chips at smaller process? I am guessing cpus may have some sort of ESD protection? Could smaller transistors break down sooner?

author: ataradov
author_rank: Super Contributor
timestamp: March 27, 2022, 03:30:48 am
content: That's a pretty broad topic. As applied to the MCUs one of the issues is the leakage current. It goes up with smaller process. This increases static current consumption, and one of the bigger advantages and pushes for the MCU in recent years is the low current consumption and long run times with battery power.ESD is not really an issue, since it is handled by the I/O pads and protection circuits there, which are already huge compared to the reset of the logic, and they are not getting smaller. There is no point in making them smaller as you are limited by the physical bonding pad size, which can't get any smaller.Smaller node size devices are more susceptible to radiation, but for consumer applications that is rarely a concern.

author: amyk
author_rank: Super Contributor
timestamp: March 27, 2022, 05:28:10 am
content: Electromigration is another thing that becomes a significant life-limiting factor.c
What is this symbol? - Page 1
Forum section: electronics / general

author: Whyknot
author_rank: Newbie
timestamp: March 26, 2022, 04:00:52 pm
content: What is the symbol: Vertical line with intersecting line at base at a 45 degree angle falling top right to bottom left? (ground, hot ground, cold or ground or? Cannot find on the net. Thanks

author: mazurov
author_rank: Frequent Contributor
timestamp: March 26, 2022, 05:23:52 pm
content: Is there a number next to it? If yes then it could be a bus.

author: SiliconWizard
author_rank: Super Contributor
timestamp: March 26, 2022, 08:25:39 pm
content: I suppose you're talking about something like that?If so, that's usually a ground. I've more often seen that kind of symbol on hand-drawn schematics though, in particular microelectronics schematics.

author: TimFox
author_rank: Super Contributor
timestamp: March 26, 2022, 08:40:28 pm
content: I have seen that symbol used, with letters and/or numbers next to it, to indicate a power supply voltage.

author: Benta
author_rank: Super Contributor
timestamp: March 26, 2022, 10:24:49 pm
content: That's a ground. Which kind exactly is anyone's guess.The only internationally standardized symbol is "protective earth" or PE, which is this one:

author: andy3055
author_rank: Super Contributor
timestamp: March 27, 2022, 01:03:20 am
content: If I remember right, they used this symbol in old German tube circuits. However, I can't remember what it was representing.

author: schmitt trigger
author_rank: Super Contributor
timestamp: March 27, 2022, 02:18:38 am
content: The anode of XRay tubes is sometimes drawn like that.Of course within an envelope which also contains a directly heated cathode.

author: Whyknot
author_rank: Newbie
timestamp: March 27, 2022, 02:21:56 am
content: Thank you SiliconWizard I thought my description might have been off a bit. And to all who responded, much appreciated.
Contacted by Mogultech a chinese IC distributor - fishy or not ? - Page 1
Forum section: electronics / general

author: ratatax
author_rank: Regular Contributor
timestamp: March 26, 2022, 12:54:41 pm
content: Hi,Yesterday I received that email on my pro and personal email address. (see attached)Out of curiosity, I asked if they had the Atmega chip i'm looking for. They answered in 30 minutes and yes they have it, at 2.5x the normal price but it's fine compared to other chinese distributors I contacted, they were all like 40x the normal price.However I don't know if I can trust them. By searching for mogul-tech or mogultech on the web I can find some results, mostly chinese websites and some references at Rochester Electronics... What do you think ?

author: m98
author_rank: Frequent Contributor
timestamp: March 26, 2022, 01:16:02 pm
content: They provide us with a worldwide shortage of ICs. I like that kind of honesty...

author: wraper
author_rank: Unknown
timestamp: March 26, 2022, 01:24:52 pm
content: At least appears to be a real company, unlike many websites selling components which are outright scam.

author: ataradov
author_rank: Super Contributor
timestamp: March 26, 2022, 04:57:21 pm
content: Your communication with the company started with them spamming you. If they are willing to start business with a sketchy practice, I automatically assume they will continue to do business the same way.Don't engage spammers, it will only encourage them.

author: ratatax
author_rank: Regular Contributor
timestamp: March 26, 2022, 05:04:26 pm
content: Quote from: ataradov on March 26, 2022, 04:57:21 pmI agree on the principle, but I really need these chips for my business. Maybe they bought tons of them and directly contact potential customers because they struggle to sell ?I think I'll try my luck...Never had a problem with chinese sellers yet, even those who looked a bit dodgy (bad websites, bad english, slow response time...)But that may be too good to be true. That chip is $2/pc under normal times. They offer $4.5/pc. All other scam ic distributors I contacted offered between $60-$90/pc

author: Tomorokoshi
author_rank: Super Contributor
timestamp: March 28, 2022, 12:49:41 am
content: I looked up the two web sites on the Wayback Machine:https://web.archive.org/web/20220815000000*/mogul-tech.comhttps://web.archive.org/web/*/www.hqewgroup.comMogul-Tech seems to go back to 2004, while HQEW Group first shows up in 2020.At least there is some presence. The same telephone number matches from 2009, so at least they're moderately stable as an organization.I can't comment on the quality of their parts.
Cheap, easily available, 1.27mm/1.25mm pitched wire to board cable assemblies? - Page 1
Forum section: electronics / general

author: Infraviolet
author_rank: Super Contributor
timestamp: March 24, 2022, 10:45:24 pm
content: Any tips for good options for cheap and "generic" (available from multiple manufacturers, the way 0805 resistors or 7400 series ICs are) cable assemblies (premade and precrimped) and corresponding board headers (though hole types desired). I've used things like molex picoblades in the past for this sort of thing, but they are awfully pricy and I'm working on something which will use quite a lot of these, plus a lot of the length and conductor count combinations aren't seemingly available right now. I'm interested in 2,3,4,6 and 12(or higher up to 16) way options particularly, and I'm after single row types not grids or the shifted grids of some ribbon cables which in practice have two sets of 2.54mm connectors pitch shifted by half. Any suggestions of the names of any such connector and cable series? As I said, ideally generic due to all the logisitical difficulties inherent in buying pretty much anything specific which comes from only a single manufacturer thesedays. Thank you

author: Someone
author_rank: Super Contributor
timestamp: March 25, 2022, 12:14:53 am
content: https://en.wikipedia.org/wiki/Flexible_flat_cableCheap, multi-source, variety of conductor counts....Through Hole? well thats not where the volume market is, so you dont get the benefits above.

author: Infraviolet
author_rank: Super Contributor
timestamp: March 27, 2022, 12:16:33 am
content: Thanks for the tip, turns out there are through hole* FFC compatible headers, just one trouble though, FFCs can't snake around complex shapes in 3D. Yes, you can do some cunning fold angles, but they can't bend in multiple directions at once the way a wire or ribbon cable can.*I do use SMD stuff, but for connectors I always swear by through hole, just incase more force somehow gets applied to it than one intends.
Any flex PCB manufacturers with fab in Australia/NZ? - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: March 17, 2022, 02:36:06 am
content: I'm having issues with china pcbs due to the lockdowns their currently. Does anyone know of a flex pcb fab in AUS/NZ ?I've done some searching but lots of them that seem to be in AUS actually turn out to source from china.

author: Mr_Computer
author_rank: Newbie
timestamp: March 21, 2022, 02:34:22 am
content: I know from experience that Lintek manufactures their PCBs in Aus. But unfortunately they don't indicate whether they can do PCB flexes.Perhaps they can of some help if you contact them.https://www.lintek.com.au/

author: Someone
author_rank: Super Contributor
timestamp: March 21, 2022, 03:40:49 am
content: Quote from: Mr_Computer on March 21, 2022, 02:34:22 amQuote from:https://www.lintek.com.au/products-and-capabilities/Their fixed price prototype product looks quite attractive!

author: Psi
author_rank: Super Contributor
timestamp: March 21, 2022, 10:16:14 am
content: It's ok now, the flex pcb package that had been stuck in china due to pandemic outbreak seems to have got out ok now and is on its way

author: tautech
author_rank: Super Contributor
timestamp: March 22, 2022, 03:30:05 am
content: Stumbled on a crowd today that makes flexies inside some of Trutest's products:https://www.markitgraphics.co.nz/Their affiliate Penmark seems who you need contact:https://www.permark.co.nz/products/membrane-keypads/
Rossman: detailed onewheel repair interview - Page 1
Forum section: electronics / general

author: thm_w
author_rank: Super Contributor
timestamp: April 02, 2022, 07:11:52 am
content: "Introducing Onewheel repair wizard, Josh Haley from Fiction Factory Boardworks"Incredibly long and detailed interview with Onewheel repair expert.Lots of interesting design notes, failure modes, etc.Interesting failures:- Unglued ferrite bounces around and can pull connector from board- Nut holding power button in place comes loose and smacks into bluetooth module- Board rubs up against the enclosure, wearing down the tracesSome of the various design progressions:- Locking out external battery packs from being used- Changing the tire size slightly so you can't use an off the shelf go-cart tire- Changing charge connector to non-standard smaller type, that can burn out- Changing the motor phase connector, to a smaller one, that can burn out- Serializing the BMS and motor controller so neither can be swapped out- Encrypting the BMS communicationTheir warranty:Quote
Hello from a new user! - Page 1
Forum section: electronics / general

author: Oli.Hall
author_rank: Contributor
timestamp: March 17, 2022, 05:57:56 pm
content: Hi,I wanted to say a quick hello to everyone!I am based in London, UK. I used to be a member a couple of years ago, but I had to re-register as my old account appears to have been deleted.I guess I will have to try and post a little more so that my user account remains active this time!Kind regards,Oli.

author: PlainName
author_rank: Super Contributor
timestamp: March 18, 2022, 10:46:07 pm
content: o/

author: Capernicus
author_rank: Frequent Contributor
timestamp: March 19, 2022, 09:56:14 am
content: What are ur interests and skills?im into digital logic, fpgas, gpus, high voltage power supplies, i do a bit of 2 bit chemistry, and my favorite machine is a robotThats what I'm looking to put together.

author: Oli.Hall
author_rank: Contributor
timestamp: March 19, 2022, 11:11:07 pm
content: I studied EE at University of Leeds then went into IT and Management Consultancy.I am returning to EE now with a particular interest in embedded systems and power electronics.I am interested in Personal Electric Vehicle and Ebike product development.If anybody else in the London area is into EE and ebikes then shoot me a PM!Oli.

author: Capernicus
author_rank: Frequent Contributor
timestamp: March 20, 2022, 01:41:28 pm
content: E-bikes are basicly a robot except they only have 1 em (electromagnetic) actuator on the back wheel.Maybe you could sell a high-voltage electrostatic bike, maybe there would be people willing to buy it cause its novel.I want to make an e-bike too, but never got around to doing it, the bikes on that classic manga Akira, had alot of e-bikes in it, thats the main movie that came out that pushed them into popularity.I bet u could make a self riding motorbike as well, that would be interesting.So what do u do exactly with them, u source the motor, driver and battery and u put them together?
Device class of Emporia Vue Gen 2? - Page 1
Forum section: electronics / general

author: siggi
author_rank: Regular Contributor
timestamp: March 21, 2022, 05:47:15 pm
content: The "new" Emporia Vue Gen 2 is a pretty compelling device for power monitoring. It has some 19 current transformer inputs, built-in power supply and runs on an ESP32 - so people have obviously reversed it and support is coming for ESPHome.I had a look at the device, which is UL listed, and I found myself wondering which "Appliance Class"https://en.wikipedia.org/wiki/Appliance_classesit would fall into. It's not clear to me, as while the device contains a switch-mode power supply, that's clearly galvanically isolated from the mains, it also divides down the mains (up to 3 phases and the neutral) and connects that directly across the isolation boundary. There's no provision for protective earth connections on the device, it only takes the phases and the neutral.Now, I don't know the precise topology, but I see a string of 4*499k resistors for each phase and the neutral on the hot side, so I'd guess the LV side ends up mains-referenced with a 500kOhm resistance. Presumably on the LV side the device is then doing differential measurement from each phase to the neutral.
Component manufacturers  - Page 1
Forum section: electronics / general

author: Ben sage
author_rank: Contributor
timestamp: October 17, 2019, 03:58:35 pm
content: Hey guys I was wondering if there is still American made components like resisters capacitors etc. thanks guys

author: tooki
author_rank: Super Contributor
timestamp: October 17, 2019, 04:30:37 pm
content: I’m sure lots of high end mil-spec ones are made in USA. I think Vishay still makes lots of stuff domestically.

author: andy3055
author_rank: Super Contributor
timestamp: October 17, 2019, 04:38:11 pm
content: Very unlikely. Most companies manufacture various parts in various countries including the U.S. It is a mixed bag so to speak. Take Vishay for example:https://en.wikipedia.org/wiki/Vishay_IntertechnologyIt is all a matter of economics and business sense (one of the reasons why countries like China has got a lot of the technology developed by US, UK and other pioneering industrialized countries).Having said that, some of the US government contracts may be filled with US made stuff like Ben has mentioned above.

author: wraper
author_rank: Unknown
timestamp: October 17, 2019, 04:50:47 pm
content: There are. But I wouldn't say that general purpose stuff has some exceptional quality compared to decent parts produced elsewhere.

author: grifftech
author_rank: Frequent Contributor
timestamp: October 17, 2019, 05:11:30 pm
content: Samsung has a fab in Austin

author: Ben sage
author_rank: Contributor
timestamp: October 17, 2019, 05:14:53 pm
content: Thanks guys for all the commentsSo what are some other good brands and what are some of the bad ones And I Heard that Rubycon is good and do I even need to worry about quality

author: andy3055
author_rank: Super Contributor
timestamp: October 17, 2019, 07:45:34 pm
content: Quote from: Ben sage on October 17, 2019, 05:14:53 pmRubycon is a good brand as well as Nichicon. But the easier thing is to buy from a supplier like Digikey, Mouser etc. You can see all the info on the product you are ordering on the web site itself.

author: Zero999
author_rank: Super Contributor
timestamp: October 17, 2019, 08:09:01 pm
content: Lots of US companies will have factories in China, simply because it's cheaper to manufacture over there. Not only is labour cheaper, but there's easier access to the raw materials.Manufacturing locally is better for goods which need a quick turnaround and is normally on a smaller scale, than in China.

author: impetus_maximus
author_rank: Contributor
timestamp: March 18, 2022, 11:21:45 pm
content: Quote from: andy3055 on October 17, 2019, 07:45:34 pmi looked at both sites (i have a Mouser account) but i don't see Country of manufacture when looking at components.a little help please? Mouser chat was no help.nothing againstthePeopleof China, but i'd rather support an American company if possible. if not, then Taiwan etc.*not going to argue about this.
Pockit: A tiny, powerful, modular computer  - Page 1
Forum section: electronics / general

author: ledtester
author_rank: Super Contributor
timestamp: March 12, 2022, 06:19:23 am
content: A pretty impressive demo of a modular hardware system:More details at:https://pockit.ai/

author: PlainName
author_rank: Super Contributor
timestamp: March 12, 2022, 06:17:44 pm
content: 'Impressive' is a bit of an understatement!

author: Exosia
author_rank: Contributor
timestamp: March 13, 2022, 12:58:13 pm
content: That is a lot of work

author: cdev
author_rank: Super Contributor
timestamp: March 16, 2022, 01:53:24 am
content: When I was a kid one of my first electronics toys of any kind was an electronic erector set that used magnetic blocks and a steel board made by Raytheon. The blocks consisted of electronic components which made up the signal chain. It was quite good. Since then the concept of electronic building blocks has always appealed to me. I still have a problem (literally) with solderless breadboards.. too many of them. Ive triedto make them neater by attaching projects semi permnently to dedicated cardboard boxes, and standardizing on their interconnects.. Its still too messy..
Hardcore:  PCIe spec missing timing of PERST to ActiveLink ?? - Page 1
Forum section: electronics / general

author: frogblender
author_rank: Regular Contributor
timestamp: March 15, 2022, 06:14:36 pm
content: Attached (pg26 and 31 from pcie CEM) shows powerup for a system with PCIe devices. I need to know what "4. Minimum PERST# inactive to PCI Express link out of electrical idle" is. The spec doesn't state what the value should be, despite having all the other values.Anybody know?I have a plug-in card, with a dingbat-of-a-chip that requires a full 2 seconds after PERST to suckle it's firmware from an eeprom before it's ready for action... I suspect this chip is busy suckling when the system bios enumerates pcie devices, and I miss the window of opportunity.

author: dmills
author_rank: Super Contributor
timestamp: March 15, 2022, 07:40:13 pm
content: I don't have an official answer, but recall there being some discussion in one of the Xilinx PCIe IP block app notes where this can clearly be an issue.https://www.xilinx.com/support/documentation/application_notes/xapp883_Fast_Config_PCIe.pdfFirst paragraph says 100ms, but that appears to be derived from the minim length of TPVPREL (SEE UG517), so they are assuming that configuration starts as soon as the power comes good and must complete and be ready for link training and enumeration by the time PERST goes high.Can you do a re enumeration once the OS is up?Regards, Dan.

author: frogblender
author_rank: Regular Contributor
timestamp: March 16, 2022, 03:51:55 pm
content: Quote from: dmills on March 15, 2022, 07:40:13 pmThanks Dan!PCIe base spec Rev1.1: Sec 6.6: "A system must guarantee that all components intended to be software visible at boot time are ready to receive Configuration Requests within 100 ms of the end of Fundamental Reset at the Root Complex". (where "fundamental reset" is PERST#).Yes, we are working on getting OS-level rescanning working...

author: dmills
author_rank: Super Contributor
timestamp: March 16, 2022, 07:57:36 pm
content: Note that I THINK the link training sequence has to fit into that 100ms because you kind of need the physical layer up before you can enumerate...While I LIKE PCIe as a bus, this aspect of it can be a ball ache.Regards, Dan.
PC1602K-P9 LCD pinout - Page 1
Forum section: electronics / general

author: jdev99
author_rank: Regular Contributor
timestamp: February 25, 2022, 02:34:04 pm
content: Can any body help me with the pinout for this display please?It is a "POWERTIP" PC1602K-P9 module (16x2 characters), based on a S6A0069 controller, which is similar to the HD44780.It is from an old network switchI traced out what I can, see attached schematic and photos.Thank you for any assistance.

author: amyk
author_rank: Super Contributor
timestamp: February 26, 2022, 03:36:29 am
content: If you have the device it came from, and a scope or logic analyser, you can find out the remaining pins. It's probably being used in 4-bit mode judging by the number of pins left over on your schematic.

author: kjr18
author_rank: Regular Contributor
timestamp: February 26, 2022, 09:26:59 am
content: Hi, I found this datasheet, it might be what you're looking for:datasheet link here.

author: jdev99
author_rank: Regular Contributor
timestamp: February 26, 2022, 02:49:40 pm
content: That is the one, thank you very much.How did you find it, if I may ask?

author: kjr18
author_rank: Regular Contributor
timestamp: February 27, 2022, 03:08:38 pm
content: First I tried searching for "pc1602k-p9" then on images I found some photos fromthis page.Last post contains dead link to datasheet, but provides another parts number that shows what you look for.

author: jdev99
author_rank: Regular Contributor
timestamp: March 14, 2022, 01:13:57 pm
content: Quote from: kjr18 on February 27, 2022, 03:08:38 pmBrilliant! I also initially tried to search for images, but only found this site:https://www.elektroda.pl/rtvforum/topic3408653.htmlWhat search engine do you use?

author: jdev99
author_rank: Regular Contributor
timestamp: March 14, 2022, 01:31:48 pm
content: Just for completeness, this display work 100% using the provided datasheet bykjr18.It seems to be 100% compatible with the HD44780 and associated Arduino libraries.Just take note, EN (pin9) and VO (pin15) must be connected to +5V.

author: kjr18
author_rank: Regular Contributor
timestamp: March 16, 2022, 02:51:56 pm
content: Quote from: jdev99 on March 14, 2022, 01:13:57 pmI used Google. DuckDuckGo only shows this one thread on this one forum.
ID this Linear Technology part please LT25203? - Page 1
Forum section: electronics / general

author: VA3SU
author_rank: Newbie
timestamp: March 11, 2022, 05:45:43 pm
content: I believe it's a LDO. I've spent a lot of time googling and no luck...RegardsKevin VO1SU

author: 1Ghz
author_rank: Unknown
timestamp: March 11, 2022, 06:18:29 pm
content: It's LT1129CST-3.3.https://www.analog.com/en/products/lt1129.html

author: VA3SU
author_rank: Newbie
timestamp: March 14, 2022, 12:32:35 pm
content: So it's the other series of numbers not the ones after the LT... Bastards.
China boycott next? - Page 1
Forum section: electronics / general

author: peter-h
author_rank: Super Contributor
timestamp: March 14, 2022, 09:12:14 pm
content: Re the Russian war on Ukraine, it is very fortunate that Russia makes no electronics; in fact they "make" very little of anything.But if China supports Russia (I hope they won't be so stupid) everything will change. Forget the £1.50 ESP32 versus the £5 ST32F4xx. Forget a lot of electronic components actually. You will be paying $0.10 for an 0805 resistor at the list price from AVX, instead of the no-name-and-his-dog Chinese resistor at $0.002 which most of us buy.I am extracting a moulding tool out of there, which I was trying to do anyway (the moulder increased the price 3x and stuck a finger up) but I am very happy to be doing it. Much of Chinese business is run either short-term or very-short-term nowadays, with blatent opportunism bordering on extortion.

author: gnif
author_rank: Unknown
timestamp: March 14, 2022, 09:33:24 pm
content: This is not technical chat... this is not the place for politics like thisLocked
Looking for reliable 12V to 18V DC step-up (boost) converter 8A - Page 1
Forum section: electronics / general

author: perdrix
author_rank: Frequent Contributor
timestamp: March 12, 2022, 11:37:23 am
content: I have been using some sealed units of Chinese origin bought on eBay. Like this one:https://www.ebay.co.uk/itm/165145242820I've have a couple fail on me. They aren't being used at anything like their "notional" rated current (more like 3 or 4A maximum).So I'm looking for recommendations of a suitable replacement. It is used outdoors (but inside a box) so the "waterproof" bit is relevant though condensation is the problem not immersion.ThanksDavid

author: Zero999
author_rank: Super Contributor
timestamp: March 13, 2022, 09:36:55 am
content: https://www.mouser.co.uk/ProductDetail/ABB/ABXS005A4X341-SRZ?qs=sGAEpiMZZMsc0tfZmXiUnQ%252BwKZhbvwnuK2zgqSwoIoNgfWpkCc4Opw%3D%3Dhttps://www.mouser.co.uk/ProductDetail/ABB/IND065BLV?qs=sGAEpiMZZMsc0tfZmXiUnQ%252BwKZhbvwnuP6IW9nnOkYfeI7hKDYfk%252Bw%3D%3D

author: perdrix
author_rank: Frequent Contributor
timestamp: March 13, 2022, 12:42:10 pm
content: Thanks - but they don't look very waterproof to meD.

author: tooki
author_rank: Super Contributor
timestamp: March 13, 2022, 01:06:58 pm
content: Quote from: perdrix on March 13, 2022, 12:42:10 pmThat's what watertight enclosures are for.
Anybody have a Wyze or August smart lock? - Page 1
Forum section: electronics / general

author: Peabody
author_rank: Super Contributor
timestamp: March 12, 2022, 02:25:56 am
content: I'm looking for a smart lock that has a separate keypad that can be placed some distance away from the lock. I'm trying to understand how the keypad communicates. If it's bluetooth, does that mean it will work when there is no internet connection or cell phone? Does it communicate directly with the lock? In general, does anybody know of a detailed description of how these smart locks work? I haven't been able to find one.
Need someone to replace the fans in our power supplies. - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: March 11, 2022, 11:40:06 am
content: Hi,We have a large batch of 1000’s of SMPS’s for which we want to renew the fans in them. They are starting to fail due to fan failure. We need to send them to somebody who can replace the fans in them all.There are companies who do this but only in China….do you know their address?

author: perdrix
author_rank: Frequent Contributor
timestamp: March 11, 2022, 12:31:45 pm
content: How quick do you want them, and how much work is involved in getting to the fans? A 2 minute job is one thing, a 2 hour job because the unit wasn't designed to be serviced is another!What sort of £££ do you expect to pay?D.

author: mc172
author_rank: Frequent Contributor
timestamp: March 11, 2022, 01:41:11 pm
content: I'll do it. I'm not in China and last I checked am not Chinese so you should have no reason to not use me. Send me one of the PSUs and the new fans and I'll give you a free quote.

author: Gyro
author_rank: Super Contributor
timestamp: March 11, 2022, 07:27:48 pm
content: Trying not to state the obvious, but why aren't you getting the manufacturer of the "large batch of 1000's of SMPS's" with defective fans to do it?

author: MrMobodies
author_rank: Super Contributor
timestamp: March 11, 2022, 11:15:45 pm
content: That sounds lot.May I ask how many years old are they and what are they being used for?
Edith Clarke - Page 1
Forum section: electronics / general

author: HuronKing
author_rank: Frequent Contributor
timestamp: March 11, 2022, 07:37:41 pm
content: It's women's history month so in the interest of recognizing that AND celebrating a GIANT in the history of electrical engineering, let's put a spotlight on Edith Clarke:https://en.wikipedia.org/wiki/Edith_ClarkeShe invented the first graphing calculator, first woman to work professionally as an EE in the US, and literally wrote the book on AC Power Analysis:https://archive.org/details/in.ernet.dli.2015.278653/page/n19/mode/2upIt's kind of startling how little the textbooks have changed from what is mostly a compilation of her lecture notes to GE.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 11, 2022, 07:53:27 pm
content: Add to the list Hedy Lamarr.https://www.womenshistory.org/education-resources/biographies/hedy-lamarrA bioptic on Howard Hughes had a nice scene with her too.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 11, 2022, 08:08:45 pm
content: Great pick!One that comes to mind offhand is:https://en.wikipedia.org/wiki/Judith_Love_CohenIt seems greatness runs in the family; on top of engineering for NASA, she also bore famous musician Jack Black.Tim
Anyone familiar with the BecTek company? - Page 1
Forum section: electronics / general

author: ledtester
author_rank: Super Contributor
timestamp: March 11, 2022, 06:31:51 am
content: Just wondering if anyone is familiar with the history of the BecTek company.Attached are some pics of some of their test equipment products. From ebay I also found an AM/FM receiver they produced:https://www.ebay.com/itm/254405062449
Magnetizing my ESD-safe screwdrivers? - Page 1
Forum section: electronics / general

author: NicholsMatt
author_rank: Contributor
timestamp: March 08, 2022, 09:19:43 pm
content: Hi all,I got a nice set of theWeraESD-safe screwdrivers a little while back and while working with them a common gripe of mine is that they are not magnetized.Would there be any big reason not to magnetize these specific screwdrivers? I'm not doing anything particularly delicate and I have other magnetized screwdrivers in my lab but it would be nice if these were also magnetized. Just wanted to check with the hivemind to see if there were any reasons I was overlooking.Thanks!

author: Gyro
author_rank: Super Contributor
timestamp: March 08, 2022, 10:01:51 pm
content: You can always demagnetise them again.

author: NicholsMatt
author_rank: Contributor
timestamp: March 09, 2022, 12:51:06 am
content: Fair enough. Thanks!

author: SeanB
author_rank: Super Contributor
timestamp: March 09, 2022, 08:09:45 am
content: The cheap magnetising and demagnetising unit you buy will work with those.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 09, 2022, 10:40:01 am
content: I just stick a small, cylindrical rare earth magnet to the screwdrive about 1 to 3 cm above the tip. Works great for holding tiny screws, and once removed, there may be some residual magnetism, which is easily removed if needed.

author: NicholsMatt
author_rank: Contributor
timestamp: March 11, 2022, 02:17:03 am
content: Thanks guys. I have one of the screwdriver magnetizers/demagnetizers so I'll just use that on it!
TechIngredients on YT demonstrating the principle of microwave weapons - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: March 08, 2022, 07:42:13 pm
content: I'm sure the 5g conspiracy nuts will think they've hit a gold mine here. Awesome video though.

author: dannybeckett
author_rank: Contributor
timestamp: March 09, 2022, 12:35:21 pm
content: Just watched this myself. Great video, really sad we've got to this point.Relevant reading material:https://en.wikipedia.org/wiki/Havana_syndrome

author: paulca
author_rank: Super Contributor
timestamp: March 10, 2022, 08:08:38 pm
content: Quote from: dannybeckett on March 09, 2022, 12:35:21 pmWorld's gone nuts. I think it was better when....... and everyone just calm down and smoke a joint.

author: Someone
author_rank: Super Contributor
timestamp: March 10, 2022, 10:41:44 pm
content: of the metal screen: "there is a small voltage that can develop in the conductors here, but its small enough and it is lost in the resistance of the aluminum, so that you can touch this and you dont get a shock"of the horn antenna: "you just cant get in front of it else well you might get some cancerous tumors"They don't understand any of it, sure its a cool physical demo, but the explanations and conclusions are baloney.

author: LaserSteve
author_rank: Super Contributor
timestamp: March 11, 2022, 02:22:46 am
content: He's lucky he did not damage his corneas.Steve

author: jh15
author_rank: Frequent Contributor
timestamp: March 11, 2022, 03:02:15 am
content: As scary as the Mythbusters show when they were filming an unshielded magnetron on the front of a car to defeat cop radar.I remember the 70;s hoopla of leaking oven concerns. It gave old tv and appliance stores a little lease on life using leakage detectors to detect danger.

author: paulca
author_rank: Super Contributor
timestamp: March 11, 2022, 06:57:34 pm
content: On leakage, there was a good "Physics Girl" video where a comment in her video started an argument about whether a microwave can interfere with Wifi.Long story short, microwaves can and do leak. The safety spec is a set amount of Ws per m2 of area, something like X watt(s) of scattered microwaves if effectively permitted, which could interfere with Wifi and other comms. However, most microwaves are much, much better than the minimum requirement, but some not by much.Then there is the metal in the microwave. I was always one who would say, Don't put it in the microwave. YMMV but just don't bother. However, my microwave came with a metal stand and has a section on using metal, asking people to put some of the metal into the microwave with a glass of water. After 30 seconds if the metal is hot to the touch, it's not appropriate.I even put something wrapped in foil in it and it didn't generate showers of sparks.... it did end up making "that noise" though, so I took it out. "That noise" being the light saber noise of plasma forming or the magnatron overloading the transform, I don't know what causes it.
Linear power supply & pumps - Page 1
Forum section: electronics / general

author: jackjr
author_rank: Newbie
timestamp: March 09, 2022, 11:13:08 pm
content: Hi there,Some time ago I hooked a small PC water-cooling pump to my lab power supply, a GW Instek GPD-3303.The pump was one of thesepopular Eheim ones, 12V.The power supply kept triggering the current limiter and after a few seconds stopped working altogether.One of the internal fuse had blown up and I had to tear-down the entire PSU to replace it.Any idea why a small pump did that? Connected to any other basic 12V switching PSU the pump works just fine.

author: jwet
author_rank: Frequent Contributor
timestamp: March 10, 2022, 04:56:40 am
content: I have the exact same power supply that is front and center on my bench- I love it. Mine has an "S" suffix- I don't know what that means but mine has been flawless.Motors very have high inrush current and significant inductance. The inrush is kind of luck of draw thing depending on where the rotor is on startup. This is a brushless motor and can likely draw some pretty healthy peak currents at strartup. Running motors on a precision supply can be difficult but I'm surprised that the Instek couldn't handle it. My best guess is when the supply kept going in and out of current limit and shutting off the output- the motor inductance was getting charged and discharged and the smart motor stuff was gettging confused. This created big voltage spikes across the motor inductance on each interruption and it worked its way back to supply. It might have been enough to break down the motor driver FET's. This is a torture test for a power supply. I imagine with all this up and down, the load went shorted and drew enough overcurrent fast enough to blow the fuse. Fuses have a time dependent reaction time but at 10x or so at the current, they can blow very fast. I guess the lesson is that if you're driving something "smart" and inductive, don't let the current limit hammer on it.

author: Circlotron
author_rank: Super Contributor
timestamp: March 10, 2022, 06:53:54 am
content: Try putting a big capacitor across the power supply output. Say 4700uF.

author: penfold
author_rank: Frequent Contributor
timestamp: March 10, 2022, 08:04:53 am
content: Quote from: jackjr on March 09, 2022, 11:13:08 pmThat is interesting, I have a similar model of PSU and have had similar kinds of experience. I've never really sat down to study its (the PSU's) characteristics in any detail, but I did find that it was quite sensitive to negative impedance loads (anything with a constant power feedback loop, if the voltage increases the current decreases, therefore, has negative incremental impedance), where it goes a bit marginally stable and very sensitive to step-changes in load. I also found it was a bit twitchy when it does a transformer tap change around 15V, often oscillates with anything other than a purely resistive load.I've needed to change fuses a few times now. I kinda chalked it up to bad design, maybe a quality control issue.
Drop in Induction Cooktop Upgrade - Page 1
Forum section: electronics / general

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: March 09, 2022, 12:43:40 pm
content: Just wondering if there is any place to purchase a suitable two burner induction cooktop replacement for my old Jenn AirOpening is 10 3/4 by 18 3/16, It is 240 V, of course.Just wondering if there is an easy way to convert two burners to induction, The entire cooktop is 47 inches and contains three burner openings and a downdraft fan.Anybody done this?Wally

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 09, 2022, 12:55:04 pm
content: Have you asked a appliance dealer, given your specs?

author: thm_w
author_rank: Super Contributor
timestamp: March 09, 2022, 09:59:21 pm
content: That is a tiny opening, can you make it larger? Why not use the entire 47" area?A standard 2 burner is something like 12"x20".Unless you go for those cheap standalone plug into the wall units.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: March 09, 2022, 10:17:12 pm
content: Very sorry bad typing should read 18 not 8.I will change it in the original postThank you
What are pcbway votes? - Page 1
Forum section: electronics / general

author: Dinos Tsakalakis
author_rank: Newbie
timestamp: March 04, 2022, 06:19:44 pm
content: Hallo as i was searching through internet i came across this webpage(https://www.pcbway.com/project/shareproject/Automatic_Hand_Sanitizer_Dispenser__Version_2___Using_ATTiny13.html) which as you can see when you move the cursor on the current picture it shows some votes for 4 sections( design , usability , creativity , content ) ,and i was wondering what does those ratting do?Are those useful for something , or are like voting on Instagram.Thanks.

author: thm_w
author_rank: Super Contributor
timestamp: March 04, 2022, 10:26:50 pm
content: Vote for winners who get coupons, t-shirts, etc.

author: floobydust
author_rank: Super Contributor
timestamp: March 05, 2022, 06:37:04 pm
content: Are their coupons real? Mentioned everywhere on the website but never had one work lol.
South African Post Office Delay Pedal - Oklo Instruments - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: March 07, 2022, 12:06:45 pm
content: South African Post Office Delay Pedal - Oklo InstrumentsNot me, but an appropriate instrument if you are feeling unhappy about postal delivery. I wonder if they offer as a shipping option the South African Post Office, whose motto seems to be "We deliver, whatever we do not take", eventually.
Slow-Mo Guys exploding caps... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: March 01, 2022, 07:37:04 pm
content: Enjoy the explosions and imagine the smell...

author: Gyro
author_rank: Super Contributor
timestamp: March 01, 2022, 08:28:32 pm
content: The third thread today. That's going to take some merging!

author: SeanB
author_rank: Super Contributor
timestamp: March 01, 2022, 08:42:04 pm
content: Quote from: Gyro on March 01, 2022, 08:28:32 pmTell me about it, seems the Slow Mo guys are popular on here.https://www.eevblog.com/forum/projects/the-slow-mo-guys-exploding-electrolytic-capacitors/Still had the URL in the copy buffer.........
84ea66b02c194a8849ef040b9bf9ff47dcae14e9afe3087f99fd94ac108058b5 - Page 1
Forum section: electronics / general

author: barycentric
author_rank: Newbie
timestamp: February 26, 2022, 10:17:05 pm
content: d0f55623803c544d45cf69f6a8ab6ea33f216ca1bc7537062866ff5e4d43259f

author: RJSV
author_rank: Super Contributor
timestamp: February 27, 2022, 05:22:43 am
content: Waste of time, I don't know what he is reading, did he ever mention 'Politically Activist' ,Or 'Censored by Admin'

author: RJSV
author_rank: Super Contributor
timestamp: March 03, 2022, 04:54:00 am
content: Yeah, he IS dumb and phoney.This video whoever that guy is, just starts talking, droning on about WHAT ?No intro, no subject, the guy just starts, abrupt, no mention WHAT about, just: metalkyoulistenNOW.
Rigol DP1308A firmware updates - Page 1
Forum section: electronics / general

author: LuckyJaker
author_rank: Contributor
timestamp: January 12, 2013, 06:59:05 pm
content: Am I the only one who has trouble contacting rigol about firmware updates ? I sent them numerous emails from their contact in their website about firmware updates for the DP1308A (a $900 power supply should be supported correctly) and I never even got an answer !.

author: nquantum
author_rank: Regular Contributor
timestamp: July 29, 2013, 03:29:18 pm
content: what u feel about this model? U owned it right? I'm interest in this model.thank

author: dr.diesel
author_rank: Super Contributor
timestamp: July 29, 2013, 03:31:12 pm
content: See my post here:https://www.eevblog.com/forum/testgear/rigol-support/But yeah, their support sucks ass.

author: huhu6608
author_rank: Newbie
timestamp: March 02, 2022, 03:58:47 am
content: Did you get it? I call rigol and tell them if they find firmware they will send it to me. But few days ago, nothing.If you have it ,give me one please. Thank you!
CPU transistors electron microscope - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: March 05, 2022, 02:29:33 am
content: 14nm and 7nm are NOT what you think it is - Visiting Tescan Part 3/3

author: mawyatt
author_rank: Super Contributor
timestamp: March 06, 2022, 12:23:24 am
content: Amazing video, thanks!!Best,
Slo-Mo guys blowing up electrolytics at 187Kfps - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: March 01, 2022, 03:47:23 pm
content: https://www.eevblog.com/forum/projects/the-slow-mo-guys-exploding-electrolytic-capacitors/Here as well, perhaps the mods can merge the threads.....