hybridfree/eevblog-posts huggingface dataset:
Running HDMI signal over ethernet twisted pair - Page 1
Forum section: electronics / general

author: Axk
author_rank: Regular Contributor
timestamp: January 28, 2022, 05:44:37 pm
content: There are these cheap RJ45 -> HDMI, HDMI -> RJ45 adapters on Aliexpress like this one -https://www.aliexpress.com/item/1005001577157733.htmlLooks like they are just connecting the HDMI pairs to the twisted pairs without any smarts in them (I guess just impedance matching) - there's a teardown photo in one of the comments in the feedback.Is there a standard for this type of thing or is it just kind of works but is not standardized?I cannot find a standard for this, there's ethernet over HDMI, more complex adapters which actually convert it to ethernet packets, but nothing for these dumb passive connectors.

author: thm_w
author_rank: Super Contributor
timestamp: January 29, 2022, 01:21:03 am
content: Attached the photos you are talking about.I don't think there would ever be a standard for something like this, as its not HDMI compliant.

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 29, 2022, 01:27:36 am
content: A proper HDMI over CAT6 adapter has chips to boost the signal.

author: Algoma
author_rank: Frequent Contributor
timestamp: January 29, 2022, 02:50:53 am
content: Such passive adapters could operate over short distances at best, Even HDMI seems to need active cables for any remarkable length (30ft+)Any signal integrity problems would cause HDMI to renegotiate its data rate, causing intermittent video issues. Longest (active) HDMI cable I've used was was 50ft active cable to a rear classroom camera as AUX input for a Conference system.
Help Epprom identification - Page 1
Forum section: electronics / general

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 28, 2022, 07:50:11 pm
content: I search these chip numbers but had no luck, can somebody tell me which is the epprom. Thanks

author: BrokenYugo
author_rank: Super Contributor
timestamp: January 28, 2022, 09:17:03 pm
content: Include the package in your search terms.Google "15532 SOP-8">"BA15532F"=low noise op amp."7421 SOP-8"> probably ISO7421EDR "digital isolator" or IRF7421 mosfet+ diode.I struggled to quickly get concrete data on the third one, but it probably isn't an EEPROM with 4 pins tied together, perhaps a mosfet or some power supply chip.Last one I'm not sure on, can't quite read the first few characters, but again, probably not a serial EEPROM with two pins tied together.

author: gamalot
author_rank: Super Contributor
timestamp: January 28, 2022, 09:58:21 pm
content: The last one should be an I2C EEPROM produced by Microchip.

author: Hornnumb2
author_rank: Regular Contributor
timestamp: January 28, 2022, 10:08:55 pm
content: Thanks that last ones numbers are terrible...
Atmospheric Electricity - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: January 27, 2022, 11:44:33 am
content: my augment is that atmospheric electricity has frequency, imparts a low alternating current in a wire.here the video shows what looks like 1Hz 3 kv atmospheric electricity to power the compass type radiant energy motor.the rectification atmospheric electricity?can this slow AC 1Hz atmospheric electricity be slow rectified to boost the current in an atmospheric capacitor?lightning in a bottle.making it available to drive a higher current. deadly but necessary for voltage step down .has any one ever tried this experiment.the compass type radiant energy motor in the video is proof of slow alternating current.how would you rectify atmospheric electricity with diodes.has anyone rectified atmospheric electricity to drive a useful load?helium balloons can replace drones, to keep the wire uphttp://www.mareasistemi.com/DIDATTICA%2027/Hermann%20Plauson%20%20Conversion%20of%20Atmospheric%20Electricity%20%28Articles%20&%20patents%29.htm
Masked ROMs failing, expected lifetime - Page 1
Forum section: electronics / general

author: Xenon
author_rank: Contributor
timestamp: January 23, 2022, 06:57:59 pm
content: Hello all,In a Tektronix 4051 I have 2 out of 16 ROMs failing (MCM6832). One verifies bad in my programmer, the other verifies good but doesn't function in the 4051.One dataline of this ROM pulses from 1,5V to 5V. Apparently the programmer says "1,5V is 0" and the 4051 says "1,5V is 1".Anyway, I have replaced those ROMs with EPROMs and it seems to be functioning again. It crashes from time to time but that can be due to bad connections in my "quick and dirty" ROM adapter.I have designed an adapter pcb to fit 2732 EPROMs. As soon as I have this fabricated I will know if the crashes remain.Now I wonder what the expected lifetime of the ROMs is. These are 45 years old.Here on the forum I read they last about 30 years max. On other websites I read they last as long as any other 74xx logic and EPROMs last only 10 years.Now what is true?Will it be wise to replace all ROMS while I'm at it? I have enough used 2732s in stock.Or is it better to leave as much as possible original (the 4051 is placed in a museum) with the risk of having to open it up again within 6 months or so.My quick and dirty adapter:

author: David Hess
author_rank: Super Contributor
timestamp: January 25, 2022, 05:54:06 pm
content: Operating life for a mask ROM should be essentially indefinite but there have been reliability problems with mask ROMs from companies like MOSTEK.

author: floobydust
author_rank: Super Contributor
timestamp: January 25, 2022, 07:59:13 pm
content: What you are seeing, it can be your IC sockets as well. I didn't have great luck with that style of IC socket, fragile and thin metal on the springs and silver black oxides.

author: David Hess
author_rank: Super Contributor
timestamp: January 26, 2022, 01:41:32 am
content: Oh, if those are edge wipe sockets from Texas Instruments, then they are known to be unreliable even on shorter scales of time.

author: Xenon
author_rank: Contributor
timestamp: January 26, 2022, 04:53:13 pm
content: The high "0" level can also be seen when it is being verified in the programmer. So it is not (only) the socket.Thanks for confirming these sockets are unreliable. I found it strange to see the contacts on the sharp edges of the ic pin instead of the flat side.And the contact force is so low the ROM's slide out of the socket from hanging upside-down for 45 years.This what I saw after opening it:

author: David Hess
author_rank: Super Contributor
timestamp: January 26, 2022, 05:09:14 pm
content: Quote from: Xenon on January 26, 2022, 04:53:13 pmI do not know how a mask ROM can fail but like I said, some are known to be reliable. Some fuse based programmable logic suffers from a problem with a similar result where the blown "fuses" regrow.Quote from: Xenon on January 26, 2022, 04:53:13 pmThermal cycling will do that whether the sockets are upside down or not. Heat will cause those edge wipe sockets to become loose relatively quickly, and then I always replace them.
Issues with Instant Setback on pace ST50 intelliheat (doesn't seem to work) - Page 1
Forum section: electronics / general

author: eeBright
author_rank: Newbie
timestamp: January 23, 2022, 07:00:02 pm
content: Hi everyone,I've recently lost the stand and handle for my pace ST50 soldering iron. It was enough for me to do occasional repair around the house, so I've decided to simply buy the new replacement parts.While at it, I've bought the stand with instant set back capability as my ST50 seem to support it (has a port for it).Since then, I've never been able to get the functionality working, and went as far as removing the front cover and checking the DC voltage at the PCB connector to verify 5V while tip is loose and GNDed signal while in the stand.I've also took the stand apart to verify that ISB switch uses only two lines (signal and GND) and connectivity (while off) from the switch to the PCB connector inside (less than 5 Ohms).I have the software setback set to lowest (1 = 10 min) and have waited up to 2 minutes for the ISB to kick in. Is my ST50 broken (works seemingly well besides ISB functionality), or am I missing something?If needed, I've bought the TD-100A 6993-0319-P1 bundle and trying to use it with older ST50 interlliheat. It doesn't mention anything about not being ST50 compatible, and simplicity of control would indicate that it should work.Thanks for all the fish.

author: PlainName
author_rank: Super Contributor
timestamp: January 23, 2022, 07:09:43 pm
content: Try setting the temperature setback to 0 (that is, off). If you enable it then it might override the stand input - with the stand input you don't need to have auto-setback at all.

author: eeBright
author_rank: Newbie
timestamp: January 24, 2022, 02:20:10 am
content: You sir are a genius!!! With software setback disabled, ISB turns the heater off in 30 seconds. This has been me nuts as I couldn't find the info on this in any manual.Thank you!!!

author: PlainName
author_rank: Super Contributor
timestamp: January 24, 2022, 09:50:31 am
content: Fortuitous timing. Just had exactly this with a Weller setup
Shielding removal idea ? - Page 1
Forum section: electronics / general

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: January 26, 2022, 09:41:14 pm
content: Shielding removal idea , especially with smaller stuff like cell phones etc.It's TOO EASY , to affect other components .Typically hot-air station .The idea is to connect leads to shield and put some current through it --- the idea being putting as little heat into surrounding area / parts & and most heat into shield .Haven't seen / heard other doing , so checking to see of other have tried , or issue's doing ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 26, 2022, 10:24:50 pm
content: Connect how? I think you'll find the amount of current needed to heat a, what is this anyway, tin plated steel shield? is rather incredible compared to the item and its size. Like, over a hundred amps. Plus the shield is connected to board ground which will see some current draw and voltage drop, maybe not enough to cause problems but it's a weird concern to have in the first place.Induction heating might be something as well, but the risk of inducing voltage directly into signal traces is even higher. (This is however the standard method for opening hermetically sealed enclosures, like for avionics.)Anyway, there's nothing wrong with plain old hot air reflow soldering. If you're having trouble like, bumping other components, perhaps try covering them with polyimide film or tape (be careful with tape, as it'll be under tension and may shift, making everything much worse of course), or consider getting some tooling to simplify the action (some kind of grasping and lifting jig?). Or, consider using a preheater so that the hot air machine has less work to do, maybe possibly able to get more localized heat that way?Tim

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: January 26, 2022, 11:01:46 pm
content: Tim , thanks for the reply , have considered to either buy or build a preheater & bumpup with hot air .But throwing this to see if it could stickMaybe lean more on amperage & low voltage - and consider as a preheater .At this point just practicing on fine pitch surface mount on stuff / working up to / or down to no-see-em [ without microscope - do have one ] .Surface mount is not an issue for repairs , until very small and tightly packed / nearby , to generally offer repair , been doing lots of repair for yrs. , just added microscope about a yr. ago , hot air a few yrs. ago , using Metcal , JBC & Hakko .Started electrical with auto repair , ham radio got me into more general electrical , like to research the market on best radio / gear for my tastes , then find broken radio / test gear to buy cheaper , and repair --- to me this is kinda like a to-fer - have a working gear & learn in one
Found this while shopping online - Page 1
Forum section: electronics / general

author: Retro Jack
author_rank: Contributor
timestamp: January 23, 2022, 06:33:32 am
content: Hi all,I just went to my local electronics shop's website and started typing "flux" and this is what I got!And when I clicked on it, I got this:https://www.jaycar.co.nz/flux-capacitor/p/OUTATIME?pos=1&queryId=b869539e1a73aa891dd447706b2afea4

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: January 23, 2022, 11:41:21 am
content: Still outta stock.

author: Brumby
author_rank: Unknown
timestamp: January 23, 2022, 12:25:06 pm
content: Yes ... I saw that a while back. (Gee, how many years ago was that?) I had a laugh.Quote from: Ed.Kloonk on January 23, 2022, 11:41:21 amYeah. I don't remember Jaycareverhaving them in stock.
Training or taking a class or spontaneous enlightenment - Page 1
Forum section: electronics / general

author: depot
author_rank: Contributor
timestamp: January 22, 2022, 03:43:19 am
content: Lately I feel down on the hobbyist attitude that goes like, "pick up a project and learn as you go".But also some engineer co-workers give feedback that I could do more things professionally. And it's the kind of feedback that stings a bit, like it's 50% or more true. In college days we wrote reports all the time and explained many nuanced design decisions and worked through calculations. These days my attitude is more to expect something like a switching regulator to work and tweak it later if something is wrong. College was only 5 years ago. I foresee that I might become one of the engineers laid off early in favor of younger people.Cash is king of course, so I really, actively want to avoid wastes of time.But there are a lot of things I could try to pick up, especially that boring mess of things related to standards. Maybe what I'm really looking for is something about technical communication. Or even like how Dave Jones here makes his youtube videos explaining some concept.Do any of you happen to vibe with me? Perhaps offer some suggestions? Thanks ahead.If there's some worthwhile online training I can probably even wrangle some boss to pay for it for me, but I'm not sure if they get the same kind of "employee training tax write off" that people in the states get.
Need N Connector "gasket" - Page 1
Forum section: electronics / general

author: xrunner
author_rank: Super Contributor
timestamp: January 21, 2022, 05:17:31 pm
content: I need some of the rubber gaskets shown in the pic for N connectors. Cannot locate a supplier for the gasket only. Please advise if you know of a source of these gaskets.Thanks in advance.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: January 21, 2022, 06:08:31 pm
content: Is this what you're looking for?https://www.americanradiosupply.com/large-silicone-gasket-washer-for-uhf-and-type-n-bulkhead-connectors/

author: xrunner
author_rank: Super Contributor
timestamp: January 21, 2022, 06:13:18 pm
content: Quote from: Sal Ammoniac on January 21, 2022, 06:08:31 pmSal - it doesn't appear so. Those are for bulkhead connectors and it looks like it goes between the connector and the chassis. The ones I want go inside the N connector.

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: January 21, 2022, 06:52:34 pm
content: Your best bet might be to buy a whole N connector and remove the gasket.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 21, 2022, 07:24:17 pm
content: Since you will need to remove the gasket to replace it, why not just measure and make your own from a suitable material, like silicone rubber?
Lighting type? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: January 22, 2022, 11:46:01 pm
content: Does anyone know what sort of lighting (LED? Incandescent?) would cause the girls to "disappear" (or more like blend in / camo against drapes and stage) like this; is this UV? Stunning dancing!!

author: ajb
author_rank: Super Contributor
timestamp: January 23, 2022, 12:06:06 am
content: That just looks like really, really saturated blue light. Could be done with incandescent and color filters if you're willing to accept extremely low efficiency (way worse than incandescent sources in general I mean) and replace your color filters every show. Nowadays LED sources will do that way better, and I'd assume that's what they're using. LED stage lighting fixtures capable of additive color mixing (RGB+W, sometimes with variable color temperature white, and sometimes with additional monochromatic LED colors to expand gamut/improve saturation) are quite common these days. It's not UV, which would look more like pastel-ish purple than blue.The basic effect here is that with light in a single saturated color--and LEDs with their sharp monochromatic output are about as saturated as you can get--it ceases to matter what color the things you're illuminating are. With white light, or simply less saturated colors, the objects that are being illuminated will reflect some wavelengths more than others, so you can still discern differences in color between the objects. But if there's only one color of light, there's only one color that will be reflected by the illuminated subjects, and you lose the ability to differentiate the colors of the objects. Some will look 'brighter' than others if they happen to reflect more of that wavelength, but that's it.The fact that it's blue also helps here, human eyesight tends to not do as well with blue, and camera sensors seem to have a more difficult time with it as well. The trick would be slightly less impressive in real life, there's a sort of compression effect inherent to recording something with a camera and playing it back on a screen, both in terms of color/luminosity resolution (the human eye has extremely good dynamic range) and in the fact that you lose the depth information that comes with direct viewing via parallax and focus information from your eyes.
eSIM vs. external SIM cards for IIoT device - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: January 21, 2022, 02:00:35 pm
content: Hi all,We're developing a compact data logger with cellular functionality. As part of this, we're discussing whether to go for an eSIM (integrated on the PCB) or a slot holder for external SIM cards.About our setup:We specialize in designing and offering "open" hardware tools, with open source software/API tools. We do not host servers or charge any subscription fees (and we do not wish to do so). Our devices target automotive engineers. In some cases we might sell a single device - in others a very large volume.From a mechanical & PCB design perspective, the eSIM is attractive because it's compact and does not affect the IP rating. Further, we hypothesize that it may be attractive for users that need to easily deploy e.g. 100 devices (rather than having to source and manually insert SIM cards in each device).However, we are unsure if we can keep the device "open" with an eSIM. Ideally we'd like to allow end customers as much freedom as possible. A user may buy 1 device in USA and wishes to use an AT&T subscription - if so, that should ideally be possible and fairly easy to setup for the user (e.g. by parsing relevant details via our device configuration). At the same time, another user in Germany may want to use a Deutsche Telekom subscription for deployment across 100 devices. In this case, ideally there would be a practical way for the user to do this via the config or some form of remote provisioning.Our understanding is that eSIM options typically involve working with global roaming partners, though we are unsure if there is a way to make that "optional" for our users. Note also that our users typically have large data transfer requirements (uploading 0.5-5.0 GB per month per device).Happy to hear any experiences/thoughts on this!
Did Australia invent the Circular Case Electronics Resistance Substitution Wheel - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: January 20, 2022, 04:23:38 am
content: Resistance Wheel or one knob resistance box, a basic tool for most beginners in electronics was first sold by Dick Smith Electronics in the 1980s now it is sold by jaycaras far as I know. the one knob circular case resistance substitution wheel is an Australian invention.A look inside a dial based resistance substitution box.

author: tom66
author_rank: Super Contributor
timestamp: January 20, 2022, 01:08:00 pm
content: Hasn't DSE been mostly an import business since it was founded? It seems an odd thing to engineer - likelihood is it was being sold by a Chinese or Hong Kong-based manufacturer and they bought them in and successfully marketed them.

author: jonovid
author_rank: Super Contributor
timestamp: January 21, 2022, 01:30:52 am
content: I have not seen this circular case design sold outside Australia until recently also has no brand or trademark on the case.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: January 21, 2022, 04:02:27 am
content: I've never seen one of those here in the US, but it looks like a convenient and useful form factor for that application. Glad someone invented it.

author: Brumby
author_rank: Unknown
timestamp: January 21, 2022, 12:18:27 pm
content: I've got one of those .... somewhere.
Really nice, ultra compact workshop/workbench/machine shop in NYC (video) - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: January 18, 2022, 02:39:02 am
content: This is by far the nicest shop (workbench doesnt do it justice) Ive ever seen. Lots of good ideas in here!Space is at such a premium in NYC Ive seen many very ingenious small shops there. When I was a little kid I used to spend many of my weekends there visiting the many electronics stores in the Canal Steet area where huge amounts of surplus was sold often from very packed stores below steet level. Oftentimes the proprietors also lived there, even with their pets. In amazing spaces. None of them are left, with maybe two or three exceptions. this was before Silicon Valley too. (the building of the World Trade Center triggered the demise of the Radio Row stores..

author: Cubdriver
author_rank: Unknown
timestamp: January 18, 2022, 05:08:40 pm
content: Holy shit! Want!!!-Pat

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: January 21, 2022, 08:04:30 am
content: Jeesus I feel so inadequate now.
B-Field inside thick coil (solenoid) - Page 1
Forum section: electronics / general

author: T_guttata
author_rank: Regular Contributor
timestamp: January 21, 2022, 05:40:37 am
content: Hi everyoneThe B-Field inside a coil is quite simple for L>>R, B=mu0*mur*N*I/L. It gets more complicated for thick coils. From high school I know that there is the law from Biot-Savart, but I have never actually used it.How could you calculate the B-field inside a thick coil with non circular cross section (example: rectangular, a=1, b=5) at least approximatively (numerically)? I'm sure you could do it with matlab, but I don't know if this is the simplest way to do it.Thanks for your help.
Login issue on this forum  - Page 1
Forum section: electronics / general

author: syau
author_rank: Frequent Contributor
timestamp: July 20, 2021, 11:38:41 pm
content: Since last Sunday, I got an issue in accessing this forum. I always greet by a message saying:-Sorry Guest, you are banned from using this forum!This ban is not set to expire.-I tried to login using my ID and password, same message show up (still say Guest!). Tried diff device (MAC, iPhone), diff browser (Safari, Chrome, Firefox), clearing all cookies, cache. Same result. Some times I managed to get in (like this time) using Private Mode in Safari but this trick not always work.Would like to know if anybody has similar experience. I also tried diff internet connection (home wi-fi, cell phone 4G, company wi-fi)

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 21, 2021, 11:44:24 am
content: It seems unusual that you were able to make THIS post then ??

author: nfmax
author_rank: Super Contributor
timestamp: July 21, 2021, 12:04:13 pm
content: Yes, I had the exact same issue, from multiple different IP addresses as well as different computers. Today, for the first time in nearly a week, a private window worked. I wonder what is happening?

author: syau
author_rank: Frequent Contributor
timestamp: July 21, 2021, 01:31:06 pm
content: I also tried VPN to UK or USA with same resultsPrivate window works but not always

author: Halcyon
author_rank: Unknown
timestamp: July 21, 2021, 10:18:10 pm
content: There was a problem with one (or more) of the ban triggers that I set up to try and reduce the amount of porn spam over the past few weeks. The bans were set a bit too broad which meant that a small number of users were effectively banned from the forum based on their hostnames (even before they could login).Sorry to those who got caught up in that. It should all be resolved now. If you're still having problems, clear your browser cache.FYI, I have retained the ban on all hosts connecting from a TOR exit node. Realistically, this shouldn't impact "normal" users of the forum.

author: syau
author_rank: Frequent Contributor
timestamp: July 22, 2021, 12:12:45 am
content: Quote from: Halcyon on July 21, 2021, 10:18:10 pmNope, it didn’t work for me (I am now on a 4G network). Neither clearing the cache fix the issue.

author: nfmax
author_rank: Super Contributor
timestamp: July 22, 2021, 07:50:45 am
content: Same machine, same ISP, same IP address (static, with reverse DNS in place). A private Safari window lets me access the site, a normal one gives me the banned message.Clearing all cookies etc., - whatever Safari chooses to include under the heading site related information - fixed the problem

author: syau
author_rank: Frequent Contributor
timestamp: July 22, 2021, 08:01:19 am
content: Restart Safari on my phone after clearing the cache seems to work

author: JustSquareEnough
author_rank: Unknown
timestamp: January 21, 2022, 05:00:44 am
content: starting happening to me today , protonvpn, multiple locations.
Incubators? - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: January 19, 2022, 03:07:52 am
content: What is nvolved i setting up an incubator. I have some business neighbors and they have lotof space they want to rent out and it would be ideal for beginning busineess, even very big ones as its totally set up to work withhuge work pieces, its realy got a lot of space, its a absolutely huge building. Its also right next to a train that goes straight to new yourk city and has tons of parking. that work with huge things. It even has its own railroad track, and is big enough to be visible from space. Its one of the biggest buildings in northern new jersey. You could assemble rocket ships in there, they have all the infrastructre to do it. It used to be a huge steel warehouse for the beams that went into NYC skycraers came from here. So has railroad tracks, has railroad connectivity into NYC (around 30 min trip) It would be the ultimate New Yrk Area maker space..They have fast internetHas lots of space. Can be seen from space.. (yes its big)Ideal for business startups. I know they want to rent out space, the bigger the better. Its absolutely hugge

author: Nominal Animal
author_rank: Super Contributor
timestamp: January 19, 2022, 06:19:53 am
content: Dammit. As I read your post, I started getting worried about exactly how many eggs you intend to incubate, until the end. (I'm writing this at breakfast time.)

author: cdev
author_rank: Super Contributor
timestamp: January 20, 2022, 11:00:31 pm
content: It depends.Have you ever seen the film, "Q"? (the winged serpent)Quote from: Nominal Animal on January 19, 2022, 06:19:53 am

author: PlainName
author_rank: Super Contributor
timestamp: January 21, 2022, 12:09:09 am
content: QuoteMarketing?
Keysight Archive Manual Quality? - Page 1
Forum section: electronics / general

author: Chris56000
author_rank: Frequent Contributor
timestamp: April 28, 2020, 02:49:35 pm
content: Hi!What on earth have Keysight used to scan old HP manuals with?I've just downloaded the 1710a Oscilloscope manual from them and like nearly all the others, it looks like they dipped spiders in toner–powder and left 'em to scuttle across the paper, and they're getting progressively worse each one they upload!I really feel I'll end up having to rewrite this one from scratch all over again and Dave @ Artek hasn't got it – he did post on here asking for an original 1710a manual I believe!Chris Williams

author: edpalmer42
author_rank: Super Contributor
timestamp: April 28, 2020, 03:15:16 pm
content: AFAIK, Keysight doesn't scan anything. They, actually HP started it, just offered to host the files. Anyone could scan and upload a manual to their FTP site. As a result, you get wildly varying quality.They claim that it's a temporary staging area, but file dates of 2005 to 2009 suggest that it's been abandoned. I don't know if you can still upload.For some reason, the site is still atftp://ftp.agilent.com/manuals/Ed

author: bsdphk
author_rank: Regular Contributor
timestamp: April 28, 2020, 07:34:51 pm
content: Some of the manuals are scanned from microfilm copies of the original manuals.

author: Cubdriver
author_rank: Unknown
timestamp: April 29, 2020, 02:01:46 am
content: Yes, some of them are truly awful. That being said, there are others that are pretty good, and I'll take a truly awful scan (for free) over NO manual at any price every time. I much prefer paper hardcopies, and try to get them whenever possible, but am very happy that Keysight is willing to host these copies of long out of production legacy equipment.at the 'spiders dipped in toner' analogy - it is very fitting in some cases.-Pat

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 22, 2020, 07:41:59 am
content: Hi!To make matters worse, I've just read it and it's incomplete as well – chapters 1 to 4 are completely missing, as are most of the component layouts and circuits, along with the Troubleshooting Guide from Chapter 8!Since I made the first post it's now disappeared from Keysight altogether!Chris Williams

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 20, 2022, 03:15:05 am
content: Hi!Further to the above, I've now discovered that some manuals that were previously reasonable quality have been replaced by ones that can only be described as bloody atrocious – look at 01725–90902 for the HP 1725A Oscilloscope for example – page 1.2 is now a very dark grey–practically black page which makes the text impossible to read, page 1.3. is half of a page of similar dark–grey smudge, and all the diagrams in the "Manual Changes" chapter 7 are unreadable!I know for a fact that the old Agilent portal had a better one than this!Chris Williams
Norway - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: January 20, 2022, 02:28:32 am
content: 😁

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: January 20, 2022, 02:30:29 am
content: There is a eev meme thread that this would have been perfect for.
New terminology - Page 1
Forum section: electronics / general

author: Transconductance
author_rank: Newbie
timestamp: January 17, 2022, 04:36:16 pm
content: I say and write "bypass capacitor" so much, I've decided to coin a new term. I can't decide how it should be spelled. So, I am asking for input from the forum.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 17, 2022, 05:12:09 pm
content: First choice: bypass capacitorSecond choice: bypass condenser

author: Bud
author_rank: Super Contributor
timestamp: January 17, 2022, 05:18:11 pm
content: Still, it is just a use case for a capacitor, not a type of a component.

author: tom66
author_rank: Super Contributor
timestamp: January 17, 2022, 06:09:23 pm
content: I am fine with just "bypass capacitor" or "decoupling capacitor"In some cases I abbreviate the latter to a "decoup."

author: themadhippy
author_rank: Super Contributor
timestamp: January 17, 2022, 06:17:31 pm
content: All capacitors should be free to be called what they want to be known as and not forced to have an identity forced upon them.

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 17, 2022, 06:29:22 pm
content: We very often just abbreviate capacitor with "cap", thus leading to "bypass cap". And funnily enough, "bypass cap" is actually shorter to say than "bypacitor" (whatever the spelling), it's 1 syllable shorter. So yeah, no. =)

author: SiliconWizard
author_rank: Super Contributor
timestamp: January 17, 2022, 06:30:05 pm
content: Quote from: themadhippy on January 17, 2022, 06:17:31 pmthis is woke time

author: magic
author_rank: Super Contributor
timestamp: January 17, 2022, 09:10:04 pm
content: Go all out: bycap

author: eti
author_rank: Super Contributor
timestamp: January 17, 2022, 09:51:40 pm
content: Something makes me think you have too much free time on your hands, and that you're either sleep-deprived, and/or have inhaled too many RA flux fumes.

author: Brumby
author_rank: Unknown
timestamp: January 18, 2022, 11:46:55 am
content: IMHO there's enough terminology to absorb as it is without creating more things to learn, especially when there is no good reason.Component type + functionis simple, self explanatory and has worked quite adequately for decades.

author: asmi
author_rank: Super Contributor
timestamp: January 18, 2022, 07:56:18 pm
content: Quote from: tom66 on January 17, 2022, 06:09:23 pmI often use a similar term "decup" as it refers to their function being "a cup of current" for the IC.

author: amyk
author_rank: Super Contributor
timestamp: January 19, 2022, 01:13:56 am
content: "Proadlizer".I personally tend to call them "reservoir caps".
"EE" (UK) broadband "disabling"... "Smart WiFi" mesh discs - being spun a yarn? - Page 1
Forum section: electronics / general

author: eti
author_rank: Super Contributor
timestamp: January 18, 2022, 09:01:58 pm
content: 18 mths ago, we took out an "EE" fibre package (UK) and pay +£10 for a "Smart WiFi" add-on, which basically encompasses a "Smart Router", "Mesh" WiFi discs, x3, and they supply a "4GEE" 4G mini hotspot, which they keep topped up with 2GB per month, and if your broadband goes down, you contact them and they add an extra 250GB to see you through the fibre b/band outage.Here's where I smell a rat - the mesh discs are available to purchase OUTRIGHT, here:https://shop.ee.co.uk/broadband/smart-wifiNowhere on that page is this "Smart WiFi" add-on to a home broadband package, mentioned as being a pre-requistite for these "Mesh" discs to work. I have just called "EE", and they spun me the line that "Your Smart WiFi discs will be disabled if you cancel the add-on"I think this is (conveniently for them), a (deliberate?) mis-understanding of how these discs work. I have PAID OFF the cost of ALL the equipment, so, does this sound fishy to you, too? If anyone has any in-depth knowledge of the inner machinations of "EE" (same as "BT" and their same "Smart WiFi" discs - BT are the parent co, the "EE" discs are re-brands) and how these "mesh" things work?I also refer you to this cached "EE" forum post, where another subscriber has the same query:https://webcache.googleusercontent.com/search?q=cache:6LoAsXzB_osJ:https://community.ee.co.uk/t5/Broadband-home-phone/Smart-WiFi-Add-On-Mis-selling/td-p/1113137+&cd=1&hl=en&ct=clnk&gl=ukMany thanks indeed.
4G LTE Cat 1 vs. Cat 4 - practical throughput? - Page 1
Forum section: electronics / general

author: Martin F
author_rank: Regular Contributor
timestamp: January 21, 2022, 02:39:35 pm
content: Hi all,We're looking at whether to select a 4G LTE Cat 1 or Cat 4 module for an IIoT device.We ideally need to upload at a rate of 3-5 Mbit/s, hence a Cat 1 should in principle suffice (5 Mbit/s UL speed). However, from vendors we hear that the "practical" throughput on such a Cat 1 module may in reality be around 50% (i.e. 2.5 Mbit/s).What we are unsure of is this:1) If the "practical throughput" in terms of upload speed of an LTE Cat 1 module is e.g. 50% of 5 Mbit/s in a specific area (e.g. rural area), would the practical throughput of an LTE Cat 4 module variant then be 50% of 50 Mbit/s in this area (i.e. 25 Mbit/s) - or would it in reality be capped to the same level as LTE Cat 1 (i.e. 2.5 Mbit/s)?2) Are there other practical advantages in an LTE Cat 4 module vs. Cat 1 expect the upload speed, everything else equal? (e.g. stability, coverage, ...)Your inputs would be helpful in us trying to identify pros/cons between Cat 1 and Cat 4 in this regard.Thanks!
quick way to straighten ANY wires.  - Page 1
Forum section: electronics / general

author: SilverSolder
author_rank: Super Contributor
timestamp: January 13, 2022, 09:13:18 pm
content: Clever - I like it!

author: RoGeorge
author_rank: Super Contributor
timestamp: January 13, 2022, 09:49:02 pm
content: He, he!

author: jpanhalt
author_rank: Super Contributor
timestamp: January 13, 2022, 10:09:18 pm
content: BS. It's a breadboard. The wires do not need to be perfectly straight. Copper work hardens as do most metals, which means bending it back to its original is almost impossible. Probably the ends have already been bent to fit in the holes. How do you roll them? Just use your fingers, If you're a tool junkie, get a pair do duck bill pliers or "hand seamer."

author: Martin Miranda
author_rank: Regular Contributor
timestamp: January 13, 2022, 10:14:41 pm
content: Quote from: jpanhalt on January 13, 2022, 10:09:18 pmK.

author: jonpaul
author_rank: Super Contributor
timestamp: January 14, 2022, 12:03:50 pm
content: Bonjour,A neat breadboard with straight wires is easier to work on and professional appearance.Since 1970, our procedure for wires to use on perforated or other breadboards and prototypes:1/ Use bare solid bus wire # 20...262/ Use two needle nose pliers or a vise and one plier.3/ Wind one turn of wire around the plier tip spaced by desired length.4/ Pull slowly until the wire stretches about 5..10% of lengthResult: Perfectly straight wire.Bon soireeJon

author: jpanhalt
author_rank: Super Contributor
timestamp: January 14, 2022, 12:24:30 pm
content: You'll get no disagreement from me about the advantages of a neat breadboard. I effectively stopped using solderless versions years ago, except for the simplest and temporary projects. For solderable boards, I usually use something with THP contacts arranged similarly to the solderless boards. Layout is easy using Eagle, and one gets schematic capture that way too.Here's an example done years ago without PTH: (attached)My preferred wire is 24 AWG with Kynar insulation. Insulated wire allows "trunks" to be built. Kynar avoids the ugly burn/melt back of PVC wire.Yes, stretching annealed copper wire will make it straight. I just roll it on the bench with my finger. However, I interpreted this thread to be about solderless boards in which the wires are re-used.

author: thm_w
author_rank: Super Contributor
timestamp: January 14, 2022, 10:56:48 pm
content: Quote from: jpanhalt on January 13, 2022, 10:09:18 pmI don't think OP said they needed to be perfectly straight.I was told in class not to use straight wires, and do point to point loops. Of course for a less dense design straight wires will work and be easier to trace.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 14, 2022, 11:07:40 pm
content: Is that what's mean tby "ratsnest?"
Can anyone recommend a durable single position wire-to-board connector (female) - Page 1
Forum section: electronics / general

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 11, 2022, 07:37:12 am
content: Can anyone recommend a single position receptacle for wire to board that is good for repeated insertion/removal?I don't fine the generic "dupont" connectors (pictured below) to be very durable for single position use, after a few insertion/removal cycles the contact starts to loose tension.The "official" Amphenol Mini-PV single position (65039-036LF) is oddly expensive at $1.50 each.I could have sworn I've used a TE/Molex part that came in single position receptacle and had a better quality contact but checking KK254, CGrid III etc everthing starts at 2 position.Thanks!

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 11, 2022, 05:40:41 pm
content: I knew I'd seen an AMP. I much prefer the inner connector on this. Can anyone ID it?

author: tooki
author_rank: Super Contributor
timestamp: January 16, 2022, 09:23:08 am
content: It’s one of the AMPMODU series, either MOD II or MOD IV, IIRC.FYI, what also works is to use genuine Mini-PV contacts in cheap Chinese DuPont housings.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 16, 2022, 04:33:05 pm
content: Quote from: tooki on January 16, 2022, 09:23:08 amSorry. Forgot to follow up. Finally got a reply from AMP that it was 87175-2 ampmodu as you say. I ordered some samples to confirm.To me the AMP contact looks even more durable than the genuine mini-pv as the housing is rectangular allowing more space..Regardless. I didn't know the genuine mini pv fit the clone housings, I'll buy some. Thanks for suggesting.

author: ajb
author_rank: Super Contributor
timestamp: January 16, 2022, 07:06:19 pm
content: I've been buying Harwin M20 terminals for this sort of purpose and they've been pretty solid. They're the same basic design as the generic 'dupont' connectors, but, ya know.... good. Offhand I don't know if they make a single-position housing. I often don't bother with the plastic shell for single connectors (like squid cables) and just cover them with heat shrink instead, which makes it easier to fit multiple single connections next to each other on a header, and a little easier to write labels on. They'll fit into the generic 'dupont' housings though, and I have a bunch of those hanging around from pulling them off of cheapo jumper wires.The M22 series is the 2mm pitch equivalent. I tend to use 1.5mm pads on a 2mm pitch for test points, so on development units I'll solder on a 2mm header to connect the M22s to. Like the M20s, they have a self contained spring contact so you can use them with heat shrink instead of the plastic housing for individual connections.
New Livingroom sound system. - Page 1
Forum section: electronics / general

author: paulca
author_rank: Super Contributor
timestamp: January 13, 2022, 07:39:53 pm
content: I still can't kill the Sony amp from 1994 in the living room, still sounds as good as it did day one. It just looks damn ugly and I'm itching for tech.I could just buy an amp and speakers, but... it's the main TV room, it would be shame to look straight past Dolby 5.1, 7.1.I was hoping that wireless surrounds were a thing, but while apparently they are, via numerous sound bar add-ons or £1000+ bleeding end WISA rigs, they are mucho $.I was hoping I didn't need to buy a big bulky receiver in 2022 but, it seems I do.I just wanted to check I understand what actually happens if I go with the receiver approach, like a Yamaha or Denon.My main input to the TV is the multimedia PC via HDMI 2.1 4K @ 60Hz. In addition the TV is a smart TV and as Netflix only support 4K via their app, I still use the smart TV apps.So in those cases, the HDMI lead from the PC goes as an input to the receiver and the output from the receiver goes to the TV. The eARC or ARC HDMI from the TV goes to the eARC input on the reciever. If I am "watching" the PC, I set it to HDMI1 and if I'm using the smart TV I set it to ARC?How linked are the A/V on the HDMI? For example if I wanted to listen to music from a BT source, will it still pass through the HDMI video of my choice?Sorry for having no clue about these things, I just don't want to spend money without understanding what exactly I need and what it will or wont do.How likely is this to work and can the PC output Dolby/THX et. al. over HDMI?

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 13, 2022, 11:29:50 pm
content: Quote from: paulca on January 13, 2022, 07:39:53 pmAre you looking to go to an all digital setup with digital amplifiers or just looking to add surround to your existing setup? For the latter, you can just get some amplifier modules to add surround channels and a sound card with surround or a HDMI audio extractor with surround. (Too bad digital amplifier modules are still a lot more expensive than analog amplifier modules of comparable power output. Also, using them for surround generally only works for the two front speakers and that's if the sound card or audio extractor can output digital and analog at the same time.)
Image problem with attached pictures - Page 1
Forum section: electronics / general

author: Benta
author_rank: Super Contributor
timestamp: January 17, 2022, 12:23:46 am
content: Attached thumbnails no longer open, but disappear instead.Clicking on thumbnails in older posts work, but as of yesterday/today thumbs in new posts no longer work.Pursuing the picture link, I get a "You're not allowed" error or something like that.This is both on my Win10 and my Linux machines, so the problem is not with me.

author: jonovid
author_rank: Super Contributor
timestamp: January 17, 2022, 02:26:19 am
content: looks like regional censorship!try a VPN

author: jmelson
author_rank: Super Contributor
timestamp: January 17, 2022, 04:57:40 pm
content: Quote from: Benta on January 17, 2022, 12:23:46 amCan you provide a link to a message with this problem?It would be interesting to see if it happens other places.Jon

author: Benta
author_rank: Super Contributor
timestamp: January 17, 2022, 08:24:55 pm
content: Thanks, the problem is gone.Seems to have been some intermittent hitch. Whether with EEVBlog or my provider: No idea.
Original USS Enterprise Model at the Smithsonian - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: January 13, 2022, 02:22:34 am
content: History and restorations of the original USS Enterprise model.

author: SilverSolder
author_rank: Super Contributor
timestamp: January 13, 2022, 02:45:13 am
content: Now, let's build a real one...

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: January 13, 2022, 02:46:08 am
content: Makes you wonder how the crew fitted into those tiny space ships in those days. Suspect they borrowed a bit of Tardis technology.
old br ln series of trains - Page 1
Forum section: electronics / general

author: m3vuv
author_rank: Super Contributor
timestamp: January 09, 2022, 03:57:26 pm
content: just been looking at a yt vid about the uk early electric locomotives,3000hp runing on 25kv ac from overhead lines,rectified to dc using mercury arc rectifiers,just wondered if anyonyone has pics of them in operation?,would be seriously scary to be near i imagine.

author: m3vuv
author_rank: Super Contributor
timestamp: January 09, 2022, 03:58:04 pm
content: was talking about the rectifiers not the loco.

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: January 09, 2022, 11:22:26 pm
content: Yup,even moving pictures.

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 11, 2022, 07:55:39 am
content: Quote from: m3vuv on January 09, 2022, 03:57:26 pmScary how? No more scary than any other HV system other than they emit really pretty light (that has some spicy UV) and have a little spark dancing around at the bottom. If you're thinking they make some sort of loud sci-fi zapping noise or something, absolutely not, they are pretty quiet except for a bit of hum/buzz and a fan.