hybridfree/eevblog-posts huggingface dataset:
[TIPS] How to identify SMD devices from the marking codes - Page 1
Forum section: electronics / general

author: gamalot
author_rank: Super Contributor
timestamp: March 29, 2018, 06:03:29 pm
content: The answer is taobao.com, search in Tabao by using the marking code as keyword, you will find it has never been so easy!

author: icezebra
author_rank: Contributor
timestamp: February 05, 2023, 08:13:38 pm
content: Thank-you, this is very helpful. I also got traction doing the same thing onwww.Ali-Express.com.Also, note that characters sequences that appear to start with upper case 'I' may actually be a vertical bar that must be omitted from your search. The attached photo marking code "IP5MW" was identified by searchingTSOP23andP5(Searching more than two or three leading chars will yield poor results as trailing chars may be date codes)Resulting part number: MP2370 (Datasheet attached, to see the vertical bar in the marking code)Also see this:https://www.eevblog.com/forum/repair/fluke-179-repair-info-incl-partial-parts-list/msg4162816/#msg4162816and this:https://ipcamtalk.com/threads/reolink-hardware.68214/#post-740670
1/6th scale BTTF DeLorean for $825 - Mrs EEVBlog is not going to be happy. - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: February 04, 2023, 03:52:40 am
content: It's huge! 72cm L x 35cm W x 25cm H (28x14x10 inches)https://www.sideshow.com/collectibles/back-to-the-future-delorean-time-machine-hot-toys-910430

author: Benta
author_rank: Super Contributor
timestamp: February 04, 2023, 04:38:32 pm
content: If it's stainless steel like the original, the price is OK.
Need Help With Germany Purchase - Page 1
Forum section: electronics / general

author: MotoDan
author_rank: Contributor
timestamp: February 01, 2023, 03:00:06 pm
content: Hello All,I am in the US and am trying to purchase a somewhat special USB-I2C converter from a vendor (ELV) in Germany who doesn't sell outside of Europe. The converter is required in order to use RTC chip vendor Micro Crystal's GUI development tool. While not absolutely necessay for development, the GUI does have some nice features and appears to only work with the ELV USB-I2C converter.I'm hoping that I can get some help from a group member from Germany who might be willing to assist with this transaction.The product can be boughtr on Amazon.de:https://www.amazon.de/-/en/interface-including-housing-connection-cables/dp/B07BR6WL2DThanks in advance for anyone willing to help!Dan

author: mendip_discovery
author_rank: Super Contributor
timestamp: February 01, 2023, 05:02:09 pm
content: Part of me smiled at this only as the tables have turned. Anyone ordering electronics from america have to fill out a whole load of daft questions about the end user etc and state you will not sell it to anyone that isn't a friend of America.I wish you luck.

author: MadScientist
author_rank: Frequent Contributor
timestamp: February 01, 2023, 05:25:57 pm
content: I’m on holiday in Greece that vendor won’t even ship inside the EU nor to most countries outside Germany

author: thm_w
author_rank: Super Contributor
timestamp: February 02, 2023, 10:53:24 pm
content: If you don't find someone here, use a shipper forwarding service.https://www.google.com/search?q=ship+from+germany+to+usa+forward

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: February 03, 2023, 03:30:50 am
content: When I need an item from Germany I use mygermany.comhttps://mygermany.comUsed this service many times, very quick service and you can choose to ship them a package which they will forward or have them purchase and forward.
How to solve Apple unlock security problem - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: February 01, 2023, 08:12:45 pm
content: 1;goto apple store to unlock your device2;pay reasonable fee and give personal data for a year in case device is stolen3;donein stolen case it would be problematic to prove ownership except first owner of particular deviceprobability for scamspermanent locking will solve it but device can be easily dissembled and sold for parts (higher demand higher price)permanent locking is bad for environmentwho is winning and who is losing ?how to solve it? the way people did it before Apple.

author: tooki
author_rank: Super Contributor
timestamp: February 02, 2023, 07:10:14 pm
content: (Bearing in mind that I didn’t watch the video because I can’t stand that guy.) You need to understand that it’s not only an issue of Apple notwantingto unlock the devices, but rather that the hardware encryption is designed such that they can’t easily do it.I also think that people need to pay attention when it comes to setting things up. They give you multiple ways to save your recovery key, including key escrow and printing it out. I won’t go quite so far as to say the user is entirely to blame, but they’re definitelymostlyto blame.

author: wraper
author_rank: Unknown
timestamp: February 02, 2023, 07:17:01 pm
content: Quote from: tooki on February 02, 2023, 07:10:14 pmIt's an online activation so they are perfectly capable of unlocking them.
Supporter Lounge access? - Page 1
Forum section: electronics / general

author: MarkS
author_rank: Unknown
timestamp: January 31, 2023, 07:47:21 pm
content: How long does it typically take from starting a subscription and emailing Dave to getting access? I really want to laugh at and talk down about the "little people" on the forums.

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 31, 2023, 08:20:03 pm
content: You have to keep on posting. Only 418 more posts to go. When you reach a 1000 you get accessBut talking down on members without access is frowned upon

author: xrunner
author_rank: Super Contributor
timestamp: January 31, 2023, 08:24:21 pm
content: Quote from: MarkS on January 31, 2023, 07:47:21 pmKeep posting, but when you get close they "the Overlords" will have to remove all our posts in there in which we've talked down and laughed about you. It's just standard procedure.

author: pcprogrammer
author_rank: Super Contributor
timestamp: January 31, 2023, 08:29:04 pm
content: I was just thinking, that I needed to add that members talked about could also gain access at some point and see what was written about themQuote from: xrunner on January 31, 2023, 08:24:21 pmWhen things become to bad the moderators do it for us

author: MarkS
author_rank: Unknown
timestamp: January 31, 2023, 08:39:31 pm
content: Quote from: pcprogrammer on January 31, 2023, 08:20:03 pmEven if you financially support the forums via Patreon?Quote from: pcprogrammer on January 31, 2023, 08:20:03 pmYour secret is safe with me!Quote from: xrunner on January 31, 2023, 08:24:21 pmOf course. Totally understandable.

author: thm_w
author_rank: Super Contributor
timestamp: January 31, 2023, 09:56:43 pm
content: If you donate money via Patreon, can send your forum member name there to Dave and he should give you access, at some point.I don't know if there is a specific $ cutoff or whatever. But I didn't message him prior to reaching 1000 posts, its not really worth bothering to do so, imo.

author: Gyro
author_rank: Super Contributor
timestamp: January 31, 2023, 10:18:36 pm
content: Quote from: MarkS on January 31, 2023, 07:47:21 pmI really wouldn't build up too much anticipation, the posting frequency is very low and there's nothing much of interest.

author: EEVblog
author_rank: Unknown
timestamp: February 01, 2023, 08:54:34 am
content: Quote from: MarkS on January 31, 2023, 08:39:31 pmI upgraded your account yesterday, you should have got a DM.

author: Gyro
author_rank: Super Contributor
timestamp: February 01, 2023, 09:31:23 am
content: Quote from: bigfoot22 on February 01, 2023, 08:26:35 amI can help you there... Nothing.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 01, 2023, 09:49:30 am
content: Quote from: Gyro on February 01, 2023, 09:31:23 amYeah you would say that won't you@bigfoot22: You just have to keep on posting to see for your self
Displayport 2.0 MST HUB chips anywhere ? - Page 1
Forum section: electronics / general

author: Hella_Wini22
author_rank: Contributor
timestamp: January 29, 2023, 07:33:40 pm
content: It irks me that there are no good small cheap AMD Motherboards that could drive 3 or more DP 4K monitors at the same time.Even though SoC itself offers 4 graphic outputs (DP/HDMI), MoBo manufacturers charge those DP connectors as if they were made of gold.Which leaves using MST hub as the only option.But MST HUBS are generally expensive AND they are limited to older versions of the standard (1.4a), which means only half the bandwith that is availableon latest AM5 chips (DP 2.0) etc.Since these are in general quite simple PCBs (basically only HUB chip + connectors), I've thought about rolling one of my own.Even better, as people generally change MoBo/CPU/RAM more often than monitors these days, such a DIY hub couldbe even more cost effective, especially if done in open-source fashion...But I've problem with finding a HUB chip that supports the latest version of the standard.Basically, all that I've managed to find is Kinetic Technologies HUB. it's $14-ish (which is fine), but it only does DP1.4:https://www.kinet-ic.com/KTM5030/Would anyone care to share better idea ?

author: Miyuki
author_rank: Frequent Contributor
timestamp: January 30, 2023, 04:25:10 pm
content: For AM4 there are some boards with 2x DP + 1x HDMI and 1x DP + 2x HDMIIf you are okay with 4K@60 then you can use a cheap 1.4 hubI was looking at this bad situation recently as I wanted to upgrade my computer where I use Thunderbolt hub for all monitorsBut the situation was solved with one huge 8K screen

author: Hella_Wini22
author_rank: Contributor
timestamp: January 31, 2023, 01:25:48 am
content: I know about those boards. But their spectrum is very narrow, they are usually very expensive and still far from ideal in that respect.For example, there is still no decent mini-ITX AM5 board that could run 3x 4k@60Hz.There is no board with 4 DP connectors, even though SoC supports that.Existing MST HUBS are at most DP 1.4, so they can do up to 2x 4k@60HzIn the meantime, it seems that I've found my answer (which is yet to come) - VMM9430:https://www.synaptics.com/company/news/synaptics-introduces-displayport-21-and-displaylink-quad-display

author: Hella_Wini22
author_rank: Contributor
timestamp: February 01, 2023, 01:29:46 am
content: QuoteAFAIK those are no different than ordinary DP port as far as the display goes, except for the suppoprted bit rate. USB-C in that case operates in DisplayPort mode, except that it sometimes doesn't support highest bit rates.That solves me nothing. USB-C with DP as rarer than DP output on AM5 boards.QuoteI was counting on universal MST support that is part of the spec.But that still means that I need MST hub, which is currently lagging the newest available standard version (2.1) and is expensive to boot,QuoteThey are the same thing, only connector is different. But that's a good idea. Maybe there are cheaper options in that form, even if I end up needing DP to USB-C cable.
What was the resolution of a Tektronix 4051? - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 06, 2023, 11:06:09 am
content: I'm currently bathed in nostalgia as a pair of Tektronix 4051s just sold on ebayhttps://www.ebay.co.uk/itm/354539833673I was outbid by > £2K so I guess I'll never own the real thing... anyway... (I played with these back in the day)this got me thinking... I presume that the X and Y is controlled by a pair of DACs... what was the resolution of those DACs? i.e. is it actually perfectly possible to emulate those on a raster screen now or did they actually have very high resolution even compared to today's standards?Just interested!

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 06, 2023, 11:20:10 am
content: Looking at the schematics it looks like X and Y DACs are 10bit? Slightly confused by the character generator part... maybe that can increase the resolution?

author: Stray Electron
author_rank: Super Contributor
timestamp: February 06, 2023, 01:48:56 pm
content: I owned one of these and a 4052 back in the day. I don't remember the resolution but it was good compared to other small computers of it's day. And the display in the 4051 used vector graphics and not an X-Y display. I gave mine to a friend of mine along with all the manuals, disk drives, SW etc and he may still have it. If anyone gets seriously interested in these, contact me and I'll try to put you in contact with him. I doubt that he's interested in selling it but if you need help with one he should be able to help. The last that I heard, he had it in storage in north Florida. Sorry I can't help with the specs other than the 4150 used a 6800 CPU and had IIRC 16k of memory and ran BASIC and had 4 external 8" floppy drives. I used mine a bit but never got into it's internals.

author: tggzzz
author_rank: Super Contributor
timestamp: February 06, 2023, 02:46:06 pm
content: Quote from: NivagSwerdna on February 06, 2023, 11:06:09 amhttps://w140.com/tekwiki/wiki/4051indicates "logical coordinates are 1024 by 1024 of which the physical screen displays 1024 by 780".I used one briefly c1976; all I can remember is the display looking better than glass TTYs of the time, and the fun of not erasing the screen.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: February 06, 2023, 04:23:08 pm
content: FWIW They occur in movies of the period and battlestar galactica etc since they don't suffer from screen raster flicking issues.http://www.starringthecomputer.com/computer.html?c=298They seem very collectable currently. @StrayElectron you might have something of value there!
Generator Parallel Connectors - Page 1
Forum section: electronics / general

author: justindd
author_rank: Newbie
timestamp: January 31, 2023, 10:24:53 pm
content: Does anyone here have a clue where to source the plugs and sockets that are used for the generator end of this sucker?https://onetak.com/products/onetak-square-plug-to-tt-30r-3-prong-female-receptacle-y-combiner-30amp-generator-inverter-parallel-cord-cable-kitThey are commonly used by multiple generator brands - it is a regular 4mm banana plug within a square safety shroud.If only someone would do something useful with AI and make it find connectors from pictures we take with our phones
If the Saturn V, Space Shuttle,Falcon Heavy and SLS were transparent. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 21, 2023, 10:08:53 am
content: See what the inner fuel tanks look like during a launch if the rockets were transparent:

author: RJSV
author_rank: Super Contributor
timestamp: January 28, 2023, 03:25:16 am
content: Fascinating, Brian, thanks.Brings up a bunch of questions, about those ROCKETs in comparison. RE: Those solid boosters;Looked like the solid boosters generally burn, in that center well, and so the question is, does that 'burn' extend all the way, up and down the cylinder ? (Rather than some pattern like burning the solid propellant from bottom up).Of course, that would be, about, a 43 year old question, now.

author: rdl
author_rank: Super Contributor
timestamp: January 28, 2023, 11:10:15 am
content: Each of the SRB segments are basically the same and burn from the center out. The shape of the hole can be used to control the burn rate and therefore the thrust to some a degree. I'm pretty sure Scott Manley has a good video on solid rocket boosters.

author: BrianHG
author_rank: Super Contributor
timestamp: January 28, 2023, 11:26:58 am
content: Quote from: RJHayward on January 28, 2023, 03:25:16 amWatch the video again carefully looking at the solid rocket boosters. When they start, they have a thin long central tube where all the propellant burns, top to bottom, pushing through that long tube opening. As propellant burns away, that tube opening widens until it's all gone, reaching the rocket's outer cylinder.That is the level of what I know, but Youtube search 'Scott Manly SRB or solid rocket boosters' and he has a few detailed video on the subject.https://www.youtube.com/results?search_query=Scott+Manly+SRB
How Nuclear Fusion works. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 22, 2023, 10:45:59 am
content: For those who really want to know the ins and outs of exactly what going on with fusion research today.This is a three part series. Part #3 goes in deep with how magnetic confinement works and the difficulties in maintaining a fusion reactions with our most popular types of fusion reactors today.Part 1.Part 2.Part 3.Enjoy!

author: jonpaul
author_rank: Super Contributor
timestamp: January 22, 2023, 12:04:51 pm
content: The real thing!Greenhouse George 1951 25 gms H3https://youtu.be/LNrYAMXnlZkIvy Mike 1952 Cryogenic 10.7 MThttps://youtu.be/Q3ezhvCzWCMCastle Bravo 1954 LiD 15 MTFrom an optimist in the nuclear age...Jon
Source of 1/4" shaft panel mount dual potentiometers - Page 1
Forum section: electronics / general

author: antenna
author_rank: Frequent Contributor
timestamp: January 19, 2023, 06:55:33 am
content: Does anyone know of a supplier/manufacturer that has 2-in-1 potentiometers? I don't mean just dual gang, I am looking for the ones that have two controls for two different pots on one shaft.Thanks,Brandon

author: EPAIII
author_rank: Super Contributor
timestamp: January 19, 2023, 09:03:58 am
content: https://www.google.com/search?client=firefox-b-1-d&q=dual+shaft+potentiometer

author: antenna
author_rank: Frequent Contributor
timestamp: January 19, 2023, 06:06:56 pm
content: Google does return more than duckduckgo does, thank you, but I was hoping for something from a reputable company. Whenever I go to mouser or or the like, their potentiometer filters do not offer the dual adjustment option. I want something with a datasheet, not a used mystery pot off ebay/amazon that wears out in a few turns. Ive tried Mouser, Digikey, Jameco, Elliot, All Electronics... Alibaba has minimum orders of 500-1000, I only need a few.

author: themadhippy
author_rank: Super Contributor
timestamp: January 19, 2023, 06:22:18 pm
content: Quoteconcentric? If its only a few maybe try your local guitar shop

author: EPAIII
author_rank: Super Contributor
timestamp: January 21, 2023, 09:34:18 am
content: DigiKey, Mouser, Newark, Allied are prime sources for name brands. Jameco, not so much. Elliot, All Electronics, Alibaba, and other web only sources are often selling surplus parts that have sat on a shelf for years; I never would have used them in my career except as an absolute last resort.First, use one of the prime sources to find and go to the OEM's web sites. Then search for what you need there. ASK FOR THEIR HELP. THEN, ask where you can buy what you need, in the quantities you need.There are parts that are hard to find. One way to get them is to find a product where they were used and try to buy them as repair parts. This does not necessarily mean that product is the item you are trying to repair or build. And do not tell them why you want them. Just let them believe they are for repairing their product. This will cost more, but when all else fails, you do what you must.Quote from: antenna on January 19, 2023, 06:06:56 pm

author: EPAIII
author_rank: Super Contributor
timestamp: January 21, 2023, 09:53:24 am
content: Search results, mostly from lesser sources:https://www.ebay.com/itm/224391459247https://www.google.com/search?q=dual+shaft+potentiometers&client=firefox-b-1-d&sxsrf=AJOqlzVEzcotvME4dBTj7aoWjHCVv5YxBw%3A1674293765705&ei=BbLLY9zfKqelqtsPl52EsAQ&ved=0ahUKEwic9p2prtj8AhWnkmoFHZcOAUYQ4dUDCA8&oq=dual+shaft+potentiometers&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQDDIGCAAQFhAeMgYIABAWEB4yBQgAEIYDMgUIABCGAzIFCAAQhgMyBQgAEIYDMgUIABCGAzoKCAAQRxDWBBCwA0oECEEYAEoECEYYAFCmH1imH2CwMmgFcAF4AIABiAGIAYgBkgEDMC4xmAEAoAECoAEByAEIwAEB&sclient=gws-wiz-serp
Cheap low-res camera sensor with high frame rates? - Page 1
Forum section: electronics / general

author: demute
author_rank: Contributor
timestamp: January 08, 2023, 03:49:20 pm
content: I'm planning to use a camera sensor to measure flicker from luminaries. In some environments there are many different luminaries with different flicker characteristics in the ceiling. Because of that I would like to use a cheap camera sensor to build a flicker meter that will create a heatmap of the luminaries.I need frame rates up to about 50 kHz but the number of pixels of the image isn't very critical. Ov2640 has a throughput of 1600x1200 pixels @ 15 fps = 28.8 MPixels/sec, so given the same data rate I would like to use a cheap camera sensor to sample an image of 320x240 pixels. So if the frame rate is 50 kHz, I would typically fit 28.8e6/50e3=576 pixels in one window and then scan it for 50 000 times or so, then moving on to the next window until I have scanned the entire image.I wish ov2640 could be used for this but from what I understand from the datasheet the frame rate doesn't depend on the window size. Does anyone know about a cheap camera sensor that can do this?

author: RoGeorge
author_rank: Super Contributor
timestamp: January 08, 2023, 04:01:59 pm
content: Why does it has to be a camera?I'll use a photodiode attached to a transimpedance amplifier.

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 08, 2023, 04:12:45 pm
content: Optical mouse sensors are high framerate and low resolution, but I'm not aware of any that support reading the raw data at a fast rate.

author: demute
author_rank: Contributor
timestamp: January 08, 2023, 04:29:53 pm
content: Quote from: RoGeorge on January 08, 2023, 04:01:59 pmI am using a photodiode in my current measurement device. However when I tried it in a store with 20+ different lights, it was hard to tell how much flicker came from each light source. So making an image of the flicker would be useful in my application.

author: demute
author_rank: Contributor
timestamp: January 08, 2023, 04:33:19 pm
content: Quote from: NiHaoMike on January 08, 2023, 04:12:45 pmI think that will result in a too low total resolution. Still, I need a sensor of at least 320x240 pixels.

author: Someone
author_rank: Super Contributor
timestamp: January 08, 2023, 09:20:09 pm
content: Quote from: demute on January 08, 2023, 03:49:20 pmIt hasn't been since the single ADC CCD days that readout depended on the pixel count, CMOS image sensors are generally row based (but have many other constraints/configurations/paths).50k FPS is getting off into very specialised devices. Is this a $100,000 device/job ? then time to redesign the concept.What is the method that requires 50kHz? direct FFT of pixel data in time? What interest is kHz rate flicker?

author: LaserSteve
author_rank: Super Contributor
timestamp: January 21, 2023, 06:17:07 am
content: Your overthinking it.Undersample, or two cameras , or acousto-optic modulator in between the lens and ccd.Steve
What a beauty - Page 1
Forum section: electronics / general

author: Messtechniker
author_rank: Frequent Contributor
timestamp: January 20, 2023, 03:34:28 pm
content: "Initially, a positive voltage is applied to the nonirritating input(Va) of the op amp. At that time the output of the op amp will..."Taken from Vishay AN50 IL300We all have a bad day sometimes

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 20, 2023, 04:13:22 pm
content: LOL good catchhttps://www.vishay.com/docs/83708/appnote50.pdfright there

author: gamalot
author_rank: Super Contributor
timestamp: January 20, 2023, 05:44:50 pm
content: Thanks, I'm learning English and your post is very helpful!

author: jmelson
author_rank: Super Contributor
timestamp: January 20, 2023, 05:54:43 pm
content: Quote from: Messtechniker on January 20, 2023, 03:34:28 pmWow, that sure looks like an autocorrect misfire.Jon

author: schmitt trigger
author_rank: Super Contributor
timestamp: January 20, 2023, 06:11:52 pm
content: You should know that nothing irritates an opamp more than having unbalanced inputs.The opamp will throw a temper tantrum, and its output will swing violently towards either rail depending on the nature of irritation, its fury limited only by its slew rate and output voltage swing.To avoid that, you should tame and de-escalate the opamp with negative feedback. Only then, can you ensure that the opamp will be a good boy and behave linearly. Warning! too much negative feedback and the behavior will be oscillatory. Make sure that you compensate accordingly if you intend to use excessive negative feedback.
Returning VR games to the arcade & addressing the problem of VR motion sickness - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: January 21, 2023, 12:59:42 am
content: VR helmet & gloves without any body feel is like a ghost in a fish bowl. you can see it but have no feeling of touch.the VR hand grips are just as gloves floating in the air, leading to motion sickness.however, with a VR mech resistance suit. feel and resistance is added to the arms and legs. by way of geared motors at the suit’s joints.with rotary encoders tracking the body of the operator in 3D space.hands can also feel touch. walls are solid to the touch. objects have mass when picked up, feet feel the floor or ground as you walk.game console manufacturers need to understand VR with a mech resistance suit, is more suited to arcade machine designbecause of the cost and complexity. also, a VR suit the head helmet with gloves are all tied together to a spine or vertical polethat the operators back are leaning against and feet set on foot platforms. it’s a strap yourself in experience. See the image example this is a powered exoskeleton gives some idea as to how a VR arcade setup would work. virtual reality laser tag game.The emergency stop button, this is the only immersive breaking experience added to the VR videoSo, the operator can end or stop the game if needed. An always viable red stop button on screenAbove the player’s head. That is also on the head helmet. This would cut the video and shutdownOculus needs to look at this.

author: james_s
author_rank: Super Contributor
timestamp: January 21, 2023, 01:42:35 am
content: A friend of mine has a VR setup at home. I used it once and it was pretty amazing but I got so nauseous that I felt physically ill for the rest of the day. I never tried it again, even just thinking about VR makes me feel a bit sick now.

author: jonovid
author_rank: Super Contributor
timestamp: January 21, 2023, 04:52:54 am
content: Quote from: james_s on January 21, 2023, 01:42:35 amhoping someone will finally figure it out. the uncanny valley in VR is seeing it, but not feeling it in an immersive moving 3D world.just as trying to read a book in a moving car when you not in control of it.gaming console companies interested in VR need to look into VR video arcade development. or public VR zones.
Simultaneous equations getting solved - Page 1
Forum section: electronics / general

author: WatchfulEye
author_rank: Regular Contributor
timestamp: January 19, 2023, 07:02:48 pm
content: I thought it might be an interesting idea to write a 2D quasi-static field solver for PCB impedance calculations.Not really knowing what I was doing, after a couple of false starts, I stumbled on a suitable discretisation for Gauss's law which allowed it to be applied in inhomogeneous conditions, and could easily be written in matrix form.What I hadn't given any consideration to was actually solving the resulting very sparse, but absolutely huge, system of equations. Never having tried anything like this before, the solution was to try every method in the textbook, and see which one worked best. I found it quite astonishing at how profound the differences in solution times were.I subsequently had the code export the intermediate steps towards the solution, just for interest to try to understand what was actually going on. The result was this video:https://www.veed.io/view/973ce332-82c9-4656-a811-e18e176f90ca?What is being solved here is the potential field (φ) surrounding a differential pair over ground plane. The electric field (E) is the spatial derivative of this - i.e. E=∇φ. An example solution for φ is attached, together with a solution for E (not quite the same problem as in the video, but close enough).
Rovus cordless vacuum improving / unknown charger IC - Page 1
Forum section: electronics / general

author: Krotow
author_rank: Regular Contributor
timestamp: June 09, 2020, 11:14:06 pm
content: Got Rovus BR-33B6 cordless vacuum as giveaway. Wanted to use it for casual computer cleaning. Then noticed that fully charged thing works only 15 seconds and then gradually fizzle out in next 20-30 seconds. Charging was painfully slow and happened only in switched off position. After few charging cycles decided to gut it out to see what is inside. Sorry, forgot about making "vanilla" photo and threw out battery before stumbled upon subject. AAA size 7.2V 1200 mAh NiMH "green" battery array, spot-welded together in series and tucked in gap around motor. Motor - most likely Chinese RS365. Drawed a circuit of this PCB in Kicad - had a reason to learn Kicad at last. See attached PDF.As expected - switching NiMH battery between charger and DC motor. I'm curious about which charging control IC Chinese "ingenious" mind used here. From function here it is more like a simple NE555 timer used to blink blue LED in 1 second interval. But pinout is different.Nothing to fix in vanilla state. Simply "improved" existing design by soldering out redundant components and connecting motor and switch directly to power connector on PCB. Only LED indicator remained to indicate working state. Test with lab PSU clearly stated that original battery was... erm... a little too weak for prolonged cleaningSo next task is to find suitable and handy enough PSU for this thing for cheap.Rovus_BR-33B6.pdf(30.46 kB - downloaded 274 times.)

author: amyk
author_rank: Super Contributor
timestamp: June 10, 2020, 12:15:40 am
content: I don't see how that LED could light unless the IC had a negative voltage generator...Is there any marking on it? It could be what BigClive refers to as "anonymous 8-pin microcontroller".

author: Krotow
author_rank: Regular Contributor
timestamp: June 10, 2020, 07:30:30 am
content: Quote from: amyk on June 10, 2020, 12:15:40 amOuch... my badYes, another reason to avoid drawing circuits at 2 AM.Update: Replaced PDF above to one with corrected LED position.Quote from: amyk on June 10, 2020, 12:15:40 amBigClive seems correct again. Can't see and touch anything on that IC nor wash away the top layer with isopropil/acetone. Look like IC came in preordered batch from manufacturer without any labeling on it.

author: Krotow
author_rank: Regular Contributor
timestamp: January 19, 2023, 10:52:07 am
content: An epilog to correctly finalize this thread. Turned out that battery fizzling out was simply a dead battery. Particular IC is some NiMH charger controller, probably custom made.However this all doesn't make sense anymore, because I have a new better vacuum now. And dumped the subject of this topic in electronic waste container.
what the S-M-T ?! - Page 1
Forum section: electronics / general

author: strawberry
author_rank: Super Contributor
timestamp: January 22, 2023, 09:32:27 pm
content: Good soldering

author: tooki
author_rank: Super Contributor
timestamp: January 23, 2023, 07:47:03 am
content: Quote from: strawberry on January 22, 2023, 09:32:27 pmNot particularly. It’s not awful, but it’s not spectacular.
I want to buy a solar panel - Page 1
Forum section: electronics / general

author: administr4tor
author_rank: Contributor
timestamp: December 10, 2022, 04:10:08 am
content: Hello,I have no idea where to buy from?which brand is good?I just want a solar panel in case of emergency and charging my phone.Please suggest well known brands with good reputation, high efficiency.Best Regards

author: MrMobodies
author_rank: Super Contributor
timestamp: December 10, 2022, 05:02:37 am
content: Is it like a little single panel solar thing that you could take around with you?

author: G7PSK
author_rank: Super Contributor
timestamp: December 10, 2022, 03:27:17 pm
content: Amazon, get at least 350 watt panel as under most conditions it will only produce a third of that, and if the weathers like it is today here nothing, as it is foggy so no wind either so a storage battery is a good idea as well.

author: administr4tor
author_rank: Contributor
timestamp: December 15, 2022, 01:29:27 am
content: Quote from: MrMobodies on December 10, 2022, 05:02:37 amyes

author: themadhippy
author_rank: Super Contributor
timestamp: January 03, 2023, 04:21:19 pm
content: a nice spam message trying to sign a a canadian up to a scheme only us brits are eligible for

author: SeanB
author_rank: Super Contributor
timestamp: January 06, 2023, 10:53:59 am
content: Funny thing is I have a plain 15W panel, used to charge SLA batteries to camp, so that we can have light at night, and not run a generator or make car batteries dead. No charge controller, work in progress, but before Christmas power was out for half a week due to the substation being vandalised, so I needed to power the gate motor, so put this across the battery as it was, and the 0.8A charge kept it going for most of that time with no mains power. Estimate to charge the battery fully it would take a week, but it kept enough charge in to keep it partly charged.What OP wants is basically a solar power bank, any number of them around, some good, most cheap and, as Dany would say, "Sooper Dodgy", and you just buy one off the river site, or off of the slow boat from the express, and guess the specs are overstated, safety is something they heard of, and quality control is "it did not blow up".

author: Nassau Cable
author_rank: Newbie
timestamp: January 17, 2023, 08:30:17 pm
content: When it comes to installing solar panels, there are several brands and mounting systems available on the market. The most popular solar mounting system is a roof-mounted solar system installed on the roof. This is equally true for both residential and commercial solar panels. There is, however, a difference that stems from the type of roofs used in businesses and personal homes.Look for 150 - 350 watt panels if you want a small one to use in specific situations or emergencies. Renogy, Go Power! or Jackery are the best options to find in Walmart or Amazon.
Are fiber optic borescopes still good? - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: January 17, 2023, 04:16:05 am
content: I bought a 1990s vintage fiberscope for real cheap and the picture quality is much better than the cheap camera-based things. But it does have that funny analog-pixelly thing going on, but the brightness and clarity are so much better than the cheap random camera thing I bought on eBay.Just for fun, I wanna ask at what price will electronic borescopes have a usable picture and what brands are good? Are there any that use a fiber bundle but a better camera in the handle instead of the tip for example? Like besides a hospital.Also how are you supposed to bend these things around a corner in a wall? Just twist and shove and hope it catches on something?
The almighty Tek 2215A... and the others. - Page 1
Forum section: electronics / general

author: Vincent
author_rank: Regular Contributor
timestamp: January 17, 2023, 02:50:19 am
content: Just came across this:Pretty entertaining to watch, but not sure whether it's outrageously biased or just moderately so. And it turns out I actually have that Tek scope (well almost. It's the original 2215, not the A revision LOL).Now I'm curious to get a scope from one of the brands in this comparison (Philips/BK/Leader) and see if these performance differences really are that significant.
My First ChatGPT Experience - Page 1
Forum section: electronics / general

author: DrNefario
author_rank: Contributor
timestamp: January 16, 2023, 05:27:18 pm
content: Up until a few days ago, I was unaware of the ChatGPT existence. I was having dinner with my son who told me about it. He said I should try it to see what it can do. This sounded intriguing, so I thought I would stump it with something hard. I asked it to write a program in Python that would read an HP3478A voltmeter via the GPIB bus. A few seconds later this is what it had:Code:import visaimport timeimport csv# Establish a connection to the voltmeterrm = visa.ResourceManager()voltmeter = rm.open_resource('GPIB0::7::INSTR')# Configure the voltmeter to measure voltagevoltmeter.write("CONF:VOLT:DC")# Set the measurement interval and the duration of the data collectioninterval = 1 # secondsduration = 300 # seconds# Open a file to save the datawith open('voltage_data.csv', 'w', newline='') as csvfile:# Create a CSV writercsvwriter = csv.writer(csvfile)# Write the header row to the CSV filecsvwriter.writerow(["Time", "Voltage"])# Start collecting datastart_time = time.time()while time.time() - start_time < duration:# Read the voltage valuevoltage = float(voltmeter.query("MEAS:VOLT:DC?"))# Get the current timecurrent_time = time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime())# Write the data to the CSV filecsvwriter.writerow([current_time, voltage])# Wait for the specified interval before taking the next measurementtime.sleep(interval)print("Data collection complete.")# Close the connection to the voltmetervoltmeter.close()The few things I had to do to run this was to:1. change visa to Pyvisa2. correct my GPIB address3. change the write and query statements to use proper HP3478 codes:a. voltmeter.write ("CONF:VOLT:DC")  voltmeter.write ("F1T4R0Z1N3")b. float(voltmeter.query("MEAS:VOLT:DC?"))  float(voltmeter.query("T3"))The older HP instruments like this were designed prior to SCPI language but the ChatGPT used SCPI commands which didn’t work. In fact, the meter thought that it was trying to write calibration values but announced that the CAL ENABLE switch was off. Good thing it was.All-in-all I was quite impressed. I next asked it to include a GUI with start and stop buttons which it promptly did using the “tkinter” modules. This one wasn’t 100% as the stop button was never read, but most of the code was there. Still, pretty impressive.
Using RF connectors as power connector - experince? - Page 1
Forum section: electronics / general

author: martin1454
author_rank: Regular Contributor
timestamp: January 16, 2023, 01:27:05 pm
content: Hello everyone!I'm in the middle of a project where I need an compact 'cheap' IP67 rated connector to mount in the back of an small chassis.The project is just running a small micro controller with a few sensors, and the plan is to use 12V with a buck converter, so I will only draw up to around 100mA.Looking at "compact" waterproof connectors that can be panel mounted, I realize most of them a quite expensive - A norocomp M5 connector in IP67 easily runs around $7-11 for the panel mounted connector and another $15-20 for the cable with connector. It makes it even more complicated since I need to extend this connector, so cutting up a cable also looks quite bad.But I was looking around, and found that some RF connectors are available for a decent price, IP67 rating and compact size (SMA or SMB for instance)What are your thoughts on using an RF connector for running 12V 100mA?

author: martin1454
author_rank: Regular Contributor
timestamp: January 16, 2023, 03:43:37 pm
content: BNC is a bit too large, I'm in the kind of "small is better" situation. My dream scenario would be something like a JST PH2 connector that would be water proof and chassis mounted receptacle. But since it is not possible to get in IP67, then a small RF connector might be easier to get.

author: martin1454
author_rank: Regular Contributor
timestamp: January 16, 2023, 04:21:37 pm
content: Quote from: bigfoot22 on January 16, 2023, 03:49:58 pmAh, yes sorry for not clarifying - The 12V is fed into a buck convter taking 12V to 3.3V, so it doesn't really matter if it is 7V-10V-12V etc....

author: martin1454
author_rank: Regular Contributor
timestamp: January 16, 2023, 04:29:05 pm
content: I don't have the schematic with me right now, but it is a TI buck converter that goes up to 28V, so close

author: langwadt
author_rank: Super Contributor
timestamp: January 16, 2023, 04:39:51 pm
content: 100mA and 12V should not be an issue at all, the datasheets I've seen for SMA list something like few mOhm and power handling any where from 50 to several hundred watt into 50R

author: tszaboo
author_rank: Super Contributor
timestamp: January 16, 2023, 04:41:28 pm
content: Most active GPS antennas will send power down the coax cable. But it's nowhere near 100mA, it's more like 10mA. And there could be quite a voltage drop on the cable it's high DC resistance as others said. It will probably work, you might need to up the voltage or work a bit on the power consumption. If you terminate it wit 50Ohm, just make sure it's AC terminated and not DC.

author: martin1454
author_rank: Regular Contributor
timestamp: January 16, 2023, 04:55:23 pm
content: Quote from: bigfoot22 on January 16, 2023, 04:44:50 pmDefinitely! luckily, I'm a bit more flexible at the power souce than in this end! Thank you for the suggestions from Gradconn - They look promising.
Fast handheld DMM for low voltage/electronics? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: January 16, 2023, 12:30:04 pm
content: What DMM would you recommend, please?- has to measure FAST, has to turn on FAST, has to have great LCD visibility- for hobby electronics use, low voltage only, less than 50V, less than 10A- CAT certification, fancy fuses, or how well it withstand to 1kV is irrelevant- indoor use only at room temperature- nice silicon probes- budget max 50-100 USD, the cheapest the better- preferable with PC logging, not a must- temp, capacitance, other useful features in an electronics lab are welcome- backlit LCD would be nice, not a must- 5000 counts would be plenty, the more, the better- a bar graph would be nice, only if it responds really fast- in stock and EU available now, not interested in AliExpress that will arrive 3 months later- again, has to be fast, FAST boot, FAST measurements, FAST continuity, GREAT visibility for the LCDIs that possible for the price range, what should I buy?
mushroom PCBs - Page 1
Forum section: electronics / general

author: madires
author_rank: Super Contributor
timestamp: January 15, 2023, 04:45:09 pm
content: Researches from the university in Linz (Austria) are producing mushroom PCBs.MycelioTronics: Fungal mycelium skin for sustainable electronics:https://www.science.org/doi/10.1126/sciadv.add7118

author: artag
author_rank: Super Contributor
timestamp: January 15, 2023, 05:32:56 pm
content: Excellent. Fibreglass is horrible for recycling. I hope they can get adequate performance.

author: Zero999
author_rank: Super Contributor
timestamp: January 15, 2023, 05:45:23 pm
content: Fibreglass isn't a big deal. It's the resin part, which can't be recycled. Phenolic paper is often used for cheaper boards, which also can't be recycled.The problem is finding something with good enough thermal, electrical and mechanical properties, which is either recyclable or biodegradable.
Faster playback speed in iPod nano 3rd generation? - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: January 11, 2023, 10:00:11 am
content: My iPod nano has for audiobooks playback a playback speed menu with only 3 positions: Slower, Normal and Faster.The 'Faster' mode is about x1.25 faster than normal. I need to make it play at least at x1.5, and sometimes at x2.0 faster. Don't want to preprocess each audiobook before loading it into player.Is there any way (service menu, alternative firmware, jailbreak, etc.) to make the player to play faster than x1.25, please?
Uploading Video - Page 1
Forum section: electronics / general

author: jpanhalt
author_rank: Super Contributor
timestamp: January 08, 2023, 04:59:04 pm
content: Is there a way to upload video, no audio, to this site?If one must use a link to an external site, what is recommended and is least invasive? That is minimal registration, not spam, etc.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 08, 2023, 08:45:42 pm
content: After a little searching, I am leaning to Vimeo as a posting site. Any opinions? (Compared to YT,Google Drive, and VEED)
Help identifying a part installed in a Harvey Wells Bandmaster TBS-50C Model - Page 1
Forum section: electronics / general

author: W3KW
author_rank: Contributor
timestamp: January 10, 2023, 11:11:20 pm
content: https://antiqueradios.com/forums/download/file.php?id=428047&mode=viewSo, what the heck is that thing riveted to the chassis of the Harvey Wells Bandmaster Senior TBS-50C model? It’s not on the schematic and measures a dead short and maybe .00001 pico farads. Useless…unless you want to short 8k ohms of 5 watt resistors. I’m always dumbfounded at the bafoonery found inside vintage gear. Who are these people doing unthinkable things to vintage gear when it wasn’t even vintage gear yet? Whomever you are, please stop.Phew. It felt good to get that off my chest.Any way, if someone knows what the heck that thing is, please let me know.Wes
Siglent SDS2104X plus - Page 1
Forum section: electronics / general

author: dperry20
author_rank: Newbie
timestamp: January 11, 2023, 05:58:42 am
content: Just purchased a new Siglent SDS2104X. I am new at this forum and wanted to know if I installed new firmware it would effect the hacks?

author: tautech
author_rank: Super Contributor
timestamp: January 11, 2023, 07:47:06 am
content: Quote from: dperry20 on January 11, 2023, 05:58:42 amWelcome to the forum.You have nothing to worry about unlike some other brands.

author: MathWizard
author_rank: Super Contributor
timestamp: January 12, 2023, 07:21:10 pm
content: I've been wanting to get 1 of these, looks like the price has gone up. Maybe this summer I'll get it.

author: tautech
author_rank: Super Contributor
timestamp: January 12, 2023, 07:32:59 pm
content: Quote from: MathWizard on January 12, 2023, 07:21:10 pmOnly back to normal after a 2 month promotion of a # of Siglent DSO's.Some had price reductions while others had free BW upgrades and all had the 6 optional decodes bundled free.
12V DC to AC power inverter for use inside vehicle - Page 1
Forum section: electronics / general

author: engineheat
author_rank: Frequent Contributor
timestamp: January 07, 2023, 02:25:47 am
content: Hi,I wanted to power an air purifier (120V, 60Hz, 48W) inside the car.I got this inverter from Home Depot:https://www.ryobitools.com/products/details/46396035363#specificationsIt says 120W of "continuous power" and it worked for the few times I tested it, albeit for only a few minutes. Lately there has been a winter storm around Christmas where the temperature dropped very low, and the inverter won't power on. It did power on once when after the interior of the car warmed up, but now it won't power up at all.I'm a novice when it comes to electronics so I wonder if the cold temperature could've ruined the inverter. If so, I'd like to know some possible reasons.I also wonder if the "48W" air purifier drew too much power and possibly burned a fuse inside the inverter?Lastly, the inverter states that it does not produce sinusoidal wave. I wonder if this could have anything to do with it. This last part is the most interesting to me. What is the ramification of powering an AC device via non-sinusoidal wave? For instance, what kind of products is it critical to use a sinusoidal input?I tried searching for Amazon for another inverter and there are many brands I've never heard of. Can you guys recommend a good one for a budget of $150? I just need to power the air purifier without it dying on me after 2 days.Thanks

author: 2N2222A
author_rank: Regular Contributor
timestamp: January 07, 2023, 04:36:42 am
content: There's probably a loose connection in the 12V DC power input somewhere. does the inverter have a light that comes on when it is working?

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 08, 2023, 12:51:58 am
content: Bad smells from automotive HVAC systems are often due to a dirty evaporator coil, try cleaning it with HVAC coil cleaner.

author: engineheat
author_rank: Frequent Contributor
timestamp: January 08, 2023, 06:20:14 pm
content: Quote from: bigfoot22 on January 07, 2023, 03:49:20 amThanks. Is this the brand you are referring to?