hybridfree/eevblog-posts huggingface dataset:
Wi(reless) Charge(ing) with laser beams [bullshit alert] - Page 1
Forum section: electronics / general

author: c5e3
author_rank: Newbie
timestamp: January 09, 2018, 04:01:56 am
content: I've just come across this weird product:http://www.wi-charge.com/The company claims that their devices are able to charge multiple devices wirelessly with laser beams emitted from a device mounted on the ceiling.Their high-end model is said to be capable of delivering 2.5 Watts of power with class 1 lasers, which are certified to have a max. emission power of 1mW (http://www.wi-charge.com/wp-content/uploads/2017/10/SII-Certificate.pdf)I guess, they're using some 'Batteriser'-technologyThere's even a fancy marketing video:

author: Muttley Snickers
author_rank: Unknown
timestamp: January 09, 2018, 04:23:43 am
content: It seems this gadget has been around for a couple of years without much interest and that particular video was uploaded twelve months ago, I wonder how many dogs and cats went blind during their testing.https://www.eevblog.com/forum/chat/infrared-laser-wireless-charging/https://www.eevblog.com/forum/chat/like-ubeam-but-with-safe-ir-lasers/

author: c5e3
author_rank: Newbie
timestamp: January 09, 2018, 04:29:39 am
content: Quote from: Muttley Snickers on January 09, 2018, 04:23:43 ami must admit, i only searched for 'wi charge' in this forum and didn't find anything. but yeah, it is nothing new
Chess: Automated Board - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: January 08, 2018, 01:26:37 pm
content: There is ahttps://www.kickstarter.com/projects/infivention/square-off-worlds-smartest-chess-board-relaunchedkick starter project for a chess board where the pieces are moved using a magnet.This project reminds me of Fidelity Phantom Chess (as described here...https://www.microsoft.com/buxtoncollection/detail.aspx?id=180)The Phantom's are very collectable but 1980s tech... I'm quite intrigued by the new version (and amazed they aren't being pursued by the original patent owner).Does anyone have one? I would be interested in a tear-down/photo of the mechanism.Thanks in advancePSI also stumbled across this...very fun
Powering a 1955 IBM 705 Vacuum Tube Logic Module - Page 1
Forum section: electronics / general

author: dave_k
author_rank: Frequent Contributor
timestamp: January 08, 2018, 10:33:04 am
content: See Ken's blog for more information ....http://www.righto.com/2018/01/examining-1954-ibm-mainframes-pluggable.html
Silly EM questions - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: January 06, 2018, 07:58:14 pm
content: Hi guys,I'm having a bit of trouble with some questions on weird EM situations. Specifically:1. Assume a cylinder* of a dielectric material, where wave propagation speed of light is lower than c. Lets say that it gets hit by an RF pulse (wave paket). Part of the pulse gets reflected, the rest travels through the material. Now let's rotate the cylinder very fast by 180 deg around its axis (which is perpendicular to where the pulse hit the object). The question: Will the RF pulse exit in the direction from which it came (basically will it travel with the mass of the object) or will it merrily travel onward, ignoring the movement of the object?2. Assume a cylinder with a dipole antenna inside of it. This cylinder rotates at an extreme velocity. In a CW RF field, is there any rate of rotation during which the antenna will have a constant DC voltage on it?**Thanks,David* - arbitrarily chosen shape, can be any 3D shape.** - the antenna must be encased in something with a lower propagation speed than c, because to get a DC voltage the ends of the antenna would have to travel at c.

author: ogden
author_rank: Super Contributor
timestamp: January 06, 2018, 08:40:29 pm
content: Quote from: daqq on January 06, 2018, 07:58:14 pmYou will get your question answered here:https://en.wikipedia.org/wiki/Sagnac_effect

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 06, 2018, 10:21:59 pm
content: 2. is the inverse of the spinning dipole emitter. As such, it is a parametric system, where the EM field couples with the rotational power, and the dipole is merely a polarizer where no power is consumed.To see that it couples with rotational power, consider if the dipole and the field are at an angle to each other. Therefore there is a torque upon the dipole. If this torque remains positive (which it will, if the field and rotor have the same angular frequency), then power is consumed from or delivered to the rotor.Relativity being what it is, this works equally well for a magnetic bias, too.Tim

author: daqq
author_rank: Super Contributor
timestamp: January 07, 2018, 10:30:37 am
content: Thanks guys!
Merry Christmas and happy new year - Page 1
Forum section: electronics / general

author: IconicPCB
author_rank: Super Contributor
timestamp: January 06, 2018, 07:03:31 pm
content: To all members celebrating Christmas according to the Julian AllendaleMerry Christmas and a happy and blessed new year.

author: Zero999
author_rank: Super Contributor
timestamp: January 06, 2018, 07:47:41 pm
content: Same to you. It's a bit late don't you think? Or have you just got back to work?

author: Gyro
author_rank: Super Contributor
timestamp: January 06, 2018, 08:33:44 pm
content: He means "JulianAllendaleCalendar" (Today = 24th Dec 2017)

author: IconicPCB
author_rank: Super Contributor
timestamp: January 07, 2018, 04:08:47 am
content: yes that... where did Allendale come from?
What is reality?  Going beyond relativity and QM... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 06, 2018, 04:20:11 am
content: I though this one is right up the alley of many here:

author: Brumby
author_rank: Unknown
timestamp: January 06, 2018, 04:53:07 am
content: Like the watch...

author: BrianHG
author_rank: Super Contributor
timestamp: January 06, 2018, 05:08:40 am
content: Yes, I noticed that. Keeping the tubes illuminated, if real, must both eat current and keep her arm warm...

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 06, 2018, 06:35:09 am
content: Quote from: BrianHG on January 06, 2018, 05:08:40 amWell they might be glass, but they are definately fake as the getters on the ends are fake.
Microscopic high speed Vinyl Record Playback video... - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 06, 2018, 07:06:20 am
content: Coooool... This is what it looks like....Enjoy...

author: helius
author_rank: Super Contributor
timestamp: January 06, 2018, 07:08:55 am
content: See also

author: Ampera
author_rank: Super Contributor
timestamp: January 06, 2018, 07:10:00 am
content: Everything's better in slow motion.

author: TerraHertz
author_rank: Super Contributor
timestamp: January 08, 2018, 03:18:20 am
content: Quote from: BrianHG on January 06, 2018, 07:06:20 amArrgh! This is what it looks like when you don't clean off dust first, and deliberately force the needle to skip tracks, scoring cut lines between tracks over and over again.Could someone who doesn't hate vinyl records redo this please?

author: Ampera
author_rank: Super Contributor
timestamp: January 08, 2018, 03:44:40 am
content: Quote from: TerraHertz on January 08, 2018, 03:18:20 amI've never figured out why people who enjoy vinyl records get so defensive about other people's stuff.Nobody who uses compact cassettes, CDs, 8-track cartridges, or the like that I know of gets upset at people for abusing their own things.

author: helius
author_rank: Super Contributor
timestamp: January 08, 2018, 04:54:52 am
content: There are far more valuable phonograms than the other media types you listed, and correctly playing phonograms always requires more work and care than the other types.The high-speed footage is marred by a very strange aluminum-foil setup which may be responsible for much of the dust. I actually find it very helpful to be able to see the damage caused by skipping the needle as a way of showing why you shouldn't allow that to happen.

author: BrianHG
author_rank: Super Contributor
timestamp: January 08, 2018, 06:41:39 am
content: After looking again, yes, skipping the needle, you can see the actual physical damage to the vinyl. I can understand the lighting difficulty while trying to maintain the temperature of everything. Looking at the difficulties involved in high speed filming this actual playback, I can forgive the dust, not to mention that that dust would be pretty much invisible at normal viewing size.At the second set of skipping, played back at 1/4 speed, you can clearly see the needle carve out 2 thin shaving streaks of vinyl and leave the dent over the middle bump.
"Self healing" Stretchable printed circuits? - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: January 05, 2018, 03:49:31 am
content: https://news.ncsu.edu/2017/12/metal-printing-electronics-2017/The paper "“Electrohydrodynamic (EHD) Printing of Molten Metal Ink for Flexible and Stretchable Conductor with Self-Healing Capability” in Advanced Materials Technologies was written by Yiwei Han and Jingyan Dong of North Carolina State University"Direct printing of flexible and stretchable conductors provides a low-cost mask-less approach for the fabrication of next-generation electronics. In this work, an electrohydrodynamic (EHD) printing technology is studied to achieve high-resolution printing of low-melting-point metal alloys, which enables low-cost direct fabrication of metallic conductors with sub 50 µm resolution. The EHD printed microscale metallic conductors represent a promising way to create conductive paths with metallic conductivity and excellent flexibility and stretchability. A stable electrical response is achieved after hundreds of bending cycles and during stretching/releasing cycles in a large range of tensile strain (0–70%) for the printed conductors with properly designed 2D patterns. Due to the low melting point of the metal alloy ink, the printed conductor demonstrates self-healing capability that recovers from failure simply by heating the device above the eutectic temperature of the metal ink and applying slight pressure. A high-density touch sensor array is fabricated to demonstrate the high-resolution capability of the EHD printing for the direction fabrication of flexible and stretchable devices."
Look inside 1959's PDP-1 computer which had a 1024x1024 screen+bonus video game. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: January 03, 2018, 03:04:57 am
content: Enjoy a piece of history:

author: xrunner
author_rank: Super Contributor
timestamp: January 03, 2018, 03:10:03 am
content: Yea cool video - I've seen it before but it's worth another viewing.

author: sony mavica
author_rank: Frequent Contributor
timestamp: January 04, 2018, 11:36:39 pm
content: cool video thanks for posting
Sci Fi Series on the Development of 3D TV - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: December 30, 2017, 07:31:40 pm
content: I need help, I'm trying to remember the name of a four or five part Sci Fi series that was on TV in the late 70's to early 90's. It concerned the development of a 3D TV system but unlike our flat panels this was a small box that sat on the table. The only other thing I can remember is that The Rolling Stones were on the soundtrack.Does anyone else remember it?

author: Zermalmer
author_rank: Regular Contributor
timestamp: January 03, 2018, 09:16:43 pm
content: I didn't know the series you are searching for...BUT if you really know that the Rolling Stones have done something for the Soundtrack, than you normally will find it in the imdbHere are the link related to soundtracks in Mick Jaggers profile*click*maybe you find there the title

author: rfeecs
author_rank: Frequent Contributor
timestamp: January 03, 2018, 11:21:39 pm
content: Might be "Wild Palms"?:https://en.wikipedia.org/wiki/Wild_PalmsMini-series featuring virtual reality, holography and some Rolling Stones in the sound track.

author: German_EE
author_rank: Super Contributor
timestamp: January 05, 2018, 04:39:17 pm
content: That's it!A big THANK YOU to rfeecs, this has been bugging me for weeks.
Legendary Instruments - Jean Michel Jarre: Amazing video and appealing to TEA! - Page 1
Forum section: electronics / general

author: Bicurico
author_rank: Super Contributor
timestamp: December 23, 2017, 06:04:17 pm
content: Hi,Just found this cool video on Youtube:It is Jean Michel Jarre showing his collection of sythesizers and explaining them.As a TEA I can somehow relate!Regards,Vitor

author: nctnico
author_rank: Super Contributor
timestamp: December 23, 2017, 07:40:13 pm
content: This reminds me of a visit to the French city called Bergerac (yes, the city from Cyrano). They played the music from Jean Michel Jarre in the streets throughout the city center (a speaker every 20 to 50 meters or so). Maddening!

author: MT
author_rank: Super Contributor
timestamp: December 23, 2017, 10:33:03 pm
content: Sonic terrorism i call that. In London the boots and clothes shops are basically loud discos, its impossible to hear have a normal conversation.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 23, 2017, 10:39:52 pm
content: Before he got big, JMJ was making music for all kinds of novelty acts. Here's one of my favorites:If that could play downtown every 20 meters, I'd be happy!

author: bd139
author_rank: Super Contributor
timestamp: January 03, 2018, 09:39:13 am
content: Here's a video which really explains what happens in context to TEA as well from Jarre. Nothing quite goes right here, so just was you want to use some old kit, it gives you the stink eye and then packs in:

author: bd139
author_rank: Super Contributor
timestamp: January 03, 2018, 09:43:23 am
content: Quote from: MT on December 23, 2017, 10:33:03 pmTry cyberdog in Camden. You'll never complain again (check youtube for videos of the place)

author: CJay
author_rank: Super Contributor
timestamp: January 03, 2018, 10:51:48 am
content: Cyberdog Camden Market, yes, full on occular and aural assault, I do rather enjoy going in there because I look rather 'straight' and enjoy the look of disdain from the staff and other customers.

author: bd139
author_rank: Super Contributor
timestamp: January 03, 2018, 11:03:05 am
content: They hate it even more when I take my kids in there(perhaps ironically I'd have fitted in quite well in there in the early 90's)
Topic Idea: Electronics-related TIL? - Page 1
Forum section: electronics / general

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: January 03, 2018, 09:50:58 am
content: So, I had this idea, don't know where to put it or how to impement it, but I thought I might share it so others could potentially build on top of it?A lot of us might know the TIL page on reddit, where you can post things you learned (TIL = Today I learned). Usually this is small details/facts kind of things. I thought it might be interesting to have either a sub-forum or dedicated topic to discuss them and provide an opportunity for others to discuss them as well? This way we could have one dedicated to electronics and related stuff, which I think might be cool?Just thinking out loud, not sure if this is a good idea or not.
Lost article from Electronic Engineering Design magazine from '90s - Page 1
Forum section: electronics / general

author: yorgabr
author_rank: Newbie
timestamp: January 04, 2018, 08:02:24 pm
content: Hello, everybody!Folks, I'm looking for an specific article from one that magazine's issues. I can't remember its title, but I remember it was about technology gradually driving people inside personal bubbles. It was illustrated with a picture showing people flying inside The Jetson's cars, chatting with smiling persons inside, but wary about people outside at once.I've dug around the web for it last three years, but without success. I'm pretty sure that issue was published between '95/'98.Please, could anyone who have a collection of that magazines check for that article? I'll be very glad.Thanks in advance,Marcio.
A visit to the Vintage Radio and communications museum in Windsor CT - Page 1
Forum section: electronics / general

author: jcrubin
author_rank: Frequent Contributor
timestamp: December 29, 2017, 01:25:48 pm
content: This pretty much covered electronics from the beginning up until now, a most interesting visit from which I documented some of the highlights of the days event into a video.Enjoy,

author: jonovid
author_rank: Super Contributor
timestamp: December 29, 2017, 02:46:04 pm
content: I got one of those,2:49 in the videowhen I was a 5 yr old as a teardown toy from my father. the base was thick black bakelite board inside a wooden dovetail joint box with a lid.remember it had three big black bakelite tuning knobs on the front panel like one's in this video. with white markings and inside the box all the wire had cloth insulation that was diped in resin.it had no valves only the sockets , tank circuit coils , and three big variable capacitors.you know what they say at the ------ take it apart!so I did at the time.

author: jcrubin
author_rank: Frequent Contributor
timestamp: December 30, 2017, 10:02:37 pm
content: I can safely say that I had all of the dynaco equipment and most of the computers.... but I already said that.... in the movie..

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: January 01, 2018, 11:51:09 am
content: This looks like my garage!

author: jcrubin
author_rank: Frequent Contributor
timestamp: January 01, 2018, 02:15:11 pm
content: Hope its climate controlled
uSleeve - Page 1
Forum section: electronics / general

author: mrjoda
author_rank: Regular Contributor
timestamp: September 27, 2017, 01:39:17 pm
content: Hello,I missed first batch of uSleeve. When will be available again ? It is very nice redesign of old idea which came from old photo negative film storage. I use it for long time and i think is it the best possible way to storage SMD parts.

author: Jeroen3
author_rank: Super Contributor
timestamp: September 27, 2017, 02:30:05 pm
content: they're sold out already? Good thing mine are already shipped.

author: EEVblog
author_rank: Unknown
timestamp: September 28, 2017, 01:01:28 am
content: A lot of the original stock had a manufacturing defect causing curling, we put up the video without checking how many good ones we had in stock.There are some more, just have to stock take and also order more.

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: October 04, 2017, 10:11:19 am
content: If you are a bit cheap like me thenhereis a link for the cheapest 35mm film storage sheets I could find.And a spreadsheet for more options:

author: Jeroen3
author_rank: Super Contributor
timestamp: October 07, 2017, 11:50:20 am
content: Quote from: EEVblog on September 28, 2017, 01:01:28 amThey do indeed curl a bit. But when you put the anti-rip sticker on they're fine.How come I got a pack with 9 SL10H?

author: neslekkim
author_rank: Super Contributor
timestamp: October 24, 2017, 06:18:55 pm
content: Quote from: EEVblog on September 28, 2017, 01:01:28 amHad a sniff around your webshop mainly to see if there was any news about the other multimeter, and found the uSleeve.. , these looks very neat, but none in stock.Is it totally out of stock now?

author: Kaziq
author_rank: Unknown
timestamp: December 21, 2017, 08:51:55 am
content: Hey Dave!I found the uSleeves too late - they were already out of stock, and they still are. Any hews when and if they will be back?

author: Seabird
author_rank: Newbie
timestamp: January 01, 2018, 06:45:00 am
content: Hi Dave:I too have just found out about these albeit too late! Are you planning another production run?

author: EEVblog
author_rank: Unknown
timestamp: January 01, 2018, 08:49:41 am
content: I have new stock now, just need to list them and sort out postage issues.

author: neslekkim
author_rank: Super Contributor
timestamp: January 01, 2018, 05:17:54 pm
content: How is the hole placement on them?, do they fit standard A4 binders, or are Australia also using Letter format etc?
New Years resolutions - And Happy New Year - Page 1
Forum section: electronics / general

author: mrpackethead
author_rank: Super Contributor
timestamp: December 31, 2017, 09:34:00 pm
content: Happy new Year everyone.My new years resolution is 3840x2160. Last years resolution was 1920 x 1080

author: GreyWoolfe
author_rank: Unknown
timestamp: December 31, 2017, 10:04:06 pm
content: I make a standard New Years' resolution that I have made for the last 30 years. I resolve never to run naked through the car wash, asking for the hot wax. I have never had a problem keeping it.

author: newbrain
author_rank: Super Contributor
timestamp: December 31, 2017, 11:25:27 pm
content: A happy new year to this virtual community!

author: Electro Detective
author_rank: Super Contributor
timestamp: January 01, 2018, 12:21:06 am
content: Car boot full of cash for everyone...and a prosperous 2018

author: KJDS
author_rank: Super Contributor
timestamp: January 01, 2018, 01:06:13 am
content: Happy new year allI'm going to start smoking, drinking whiskey and sleeping with ugly people

author: Electro Detective
author_rank: Super Contributor
timestamp: January 01, 2018, 01:16:13 am
content: Veterans Tip: Make sure the ugly people have a good paycheck to cover the expenses (smokes, booze, cabs, motel rooms...)

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 01, 2018, 01:25:27 am
content: I'm going to stop making every screw or other fastener I touch lose all association with anything and vanish into the junkpile ether. Then I'm going to start a charity called Screws for the Screwless...EDIT: I'm going to need a lot of metal fasteners...and possibly some of your ugly people.

author: Brumby
author_rank: Unknown
timestamp: January 01, 2018, 01:55:14 am
content: Quote from: Electro Detective on January 01, 2018, 12:21:06 amI'd better empty all the crap out of my car's boot then.

author: GreyWoolfe
author_rank: Unknown
timestamp: January 01, 2018, 04:12:48 am
content: Quote from: Electro Detective on January 01, 2018, 12:21:06 amI have a mini van sized cargo van. Really frikken big boot. All that cash would be wonderful.

author: Electro Detective
author_rank: Super Contributor
timestamp: January 01, 2018, 01:23:04 pm
content: Might be a bit of a wait, the cash genie has the answering machine on
Is this the new Tinfoil hat - Page 1
Forum section: electronics / general

author: GreenHW_GUY
author_rank: Contributor
timestamp: December 29, 2017, 09:03:04 am
content: http://www.ebay.de/itm/dbmesh-Cap-2-Dunkelgrau-Gr-M-Anti-Elektrosmog-Dockercap-Mutze-Funkwellen-RFID/172257558857?hash=item281b59c149:g:gIUAAOSwBahVC~KfI Personally don't think this has some protection if there is some EMF or Wave that hit you, so think this is just a Gimmick, but what do you think ?

author: ebastler
author_rank: Super Contributor
timestamp: December 30, 2017, 10:44:52 pm
content: Rest assured that, if you wear this cap, your head will not be damaged by radio transmissions. (Just as it won't if you donotwear this cap...)My favorite claim in that ebay listing is: "The inner protective fiber works effectively in both directions." So if you happen to have a radiating head, this cap will protect your family and neighbors from your emissions.

author: Mr. Scram
author_rank: Super Contributor
timestamp: December 30, 2017, 10:49:18 pm
content: Quote from: ebastler on December 30, 2017, 10:44:52 pmYou never know what they implanted in your head, do you?

author: Circlotron
author_rank: Super Contributor
timestamp: December 30, 2017, 11:32:18 pm
content: 46 Euros?Beware of cheap Chinese imitations.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: December 31, 2017, 03:16:41 am
content: Great. Now we have to be aware of the camouflaged crazies too.

author: Cyberdragon
author_rank: Super Contributor
timestamp: December 31, 2017, 03:46:12 am
content: Voltamort says the only way to properly test this device is to fire a maser at the subject for an extended time and observe the results.

author: VK5RC
author_rank: Unknown
timestamp: December 31, 2017, 09:50:42 am
content: Don't you guys 'know' the hats actually make it easier for mind control!https://www.theatlantic.com/health/archive/2012/09/tin-foil-hats-actually-make-it-easier-for-the-government-to-track-your-thoughts/262998/HiHi.. Sorry I couldn't get the original reference.

author: AllTheGearNoIdea
author_rank: Unknown
timestamp: January 01, 2018, 11:43:25 am
content: This is the new Hogwart sorting hat as it can find the bloody idiots!
Giant ocean whirlpool pairs, and cool pool tricks - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: January 02, 2018, 01:57:22 am
content: Not electronics, but it's neat.http://joannenova.com.au/2017/12/giant-double-whirlpools-in-the-ocean-and-the-diy-ones-you-can-make-in-your-pool/

author: Buriedcode
author_rank: Super Contributor
timestamp: January 02, 2018, 06:20:34 am
content: Interesting! thank you for the link

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: January 02, 2018, 09:54:14 am
content: Makes you wonder if tornados have some similar kind of structure underwater. Or in the sky. If so this could be really significant as it might indicate ways to destroy a tornado before it makes landfall.
Fake discount at Seedstudio - Page 1
Forum section: electronics / general

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 03, 2018, 01:58:46 pm
content: Hello All,I just received by mail some bargains from seedstudio, ashttps://www.seeedstudio.com/s/Xbee-Pro-IEEE-802.15.4-2.4Ghz-63mW-250Kbps-RF-Module-w%26-U.FL-Antenna-Connector-XBP24-AUI-001J-p-1967.html?utm_source=mailchimp&utm_medium=edm&utm_campaign=new_0103where the Xbeepro XBP24-AUI-001J module is offered at 14.95 $ instead of 81.75 $ .but if you check at Digikey, you see that the normal price is 32 $https://www.digikey.com/product-detail/en/digi-international/XBP24-AUI-001J/XBP24-AUI-001J-ND/3482671I hope it is just a mistake from seedstudio.
Hall effect sensors VS LVDT. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: December 29, 2017, 10:19:30 am
content: A common way in automotive industry to measure absolute position is the use of Hall effect sensors. Like TPS (Throttle Positions Sensor), APP (Accelerator Pedal Position), SAS (Steering Angle Sensor) etc.When it come to suspension systems the most common sensor is LVDT (Linear Voltage Differential Transformer).Why? Speed? Sensitivity?LVDT:Alexander.

author: b_force
author_rank: Super Contributor
timestamp: December 29, 2017, 01:11:39 pm
content: A LVDT is a mechanical way to measure things.Depending on your application, that could give an extra 'load' on the part that's moving, and therefor you will get different results.Also mechanical components in general will break or need to be replaced more often.Besides there are also obvious reasons, like speed, acceleration etc.That's just matter of checking the specs.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 29, 2017, 01:40:23 pm
content: The newest generation that we find in cars now, areSelf Calibrating TPOS Speed Sensors.They have higher accuracy and faster reaction times.LVDT is far too slow for most applications.Since the suspension is relative slow, it is ok to use LVDT

author: firewalker
author_rank: Super Contributor
timestamp: December 29, 2017, 01:58:53 pm
content: What does True Power On State refers to?Alexander.

author: David Hess
author_rank: Super Contributor
timestamp: December 29, 2017, 03:14:47 pm
content: LVDTs are much more reliable than hall effect sensors and especially so under adverse conditions. Hall effect sensors are just cheap.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 29, 2017, 04:30:18 pm
content: Quote from: firewalker on December 29, 2017, 01:58:53 pmHere is the datasheet attached.Features and Benefits:- Chopper stabilized; optimized for automotive cam sensing applications- Optimized absolute timing accuracy step size through gradual transition from TPOS to Running Mode- High immunity to signal anomalies resulting from magnetic overshoot and peak-to-peak field variation- Tight timing accuracy over full operating temperature range- True zero-speed operation- Automatic Gain Control circuitry for air gap independent switchpoints- Operation at supply voltages down to 3.3 V- Digital output representing target profile- Undervoltage lockout (UVLO)- Patented Hall IC-magnet system- Increased output fall time for improved radiated emissions performance

author: firewalker
author_rank: Super Contributor
timestamp: December 29, 2017, 06:05:20 pm
content: So, TPOS means it knows the absolute position of the object immediately after power up. Correct?Alexander.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 29, 2017, 06:29:58 pm
content: Yes, and it knows in which direction the shaft is turning.So, it is one more indication of possible backfire and a reverse running engine, to shut off all fuel supply and ignition.
Questionable safety in youtube DIY spot welder build video - Page 1
Forum section: electronics / general

author: filssavi
author_rank: Frequent Contributor
timestamp: December 30, 2017, 09:52:55 pm
content: I'd like to know what is your opinion on the electrical safety of the diy project in question (video link below)I would have liked to at least a fuse even a useless (and dangerous in that application) glass one would have been better than nothing

author: Macbeth
author_rank: Super Contributor
timestamp: December 30, 2017, 10:15:51 pm
content: Perfectly fine. A glass fuse would be fantastic, I would love to see one. I prefer the replacement copper tips which do the job without any Elfen Safety bollocks.

author: sleemanj
author_rank: Super Contributor
timestamp: December 30, 2017, 10:35:38 pm
content: I don't really like the mains micro switch being so exposed like that, if it was me I'd have the trigger switch be low voltage back to a relay in the box, or at least use double-insulated mains cable to the switch and zip-tie it to the top bar.

author: Nusa
author_rank: Super Contributor
timestamp: December 30, 2017, 10:45:02 pm
content: It's one of those cases where a fuse doesn't add much, much like a kitchen toaster (ever see a fuse on those?), due to the pure simplicity of the device. But sure, adding a formal fuse on the primary side won't hurt. Or perhaps use a circuit breaker instead of a wall switch.From the safety viewpoint, I'd actually be more concerned about the exposed high voltage wire going up to the handle switch. A little incidental damage to the insulation, and the user may get a nasty shock the next time he uses it.
Cheap ass but slow TMI service - Page 1
Forum section: electronics / general

author: TAMHAN
author_rank: Frequent Contributor
timestamp: December 29, 2017, 11:54:09 am
content: Hello Folks,know it is almost two years since I asked this question, but my lab has grown a lot. And I wanted to share a company which has helped me, given that I recently saw the discussion about the spectral analyzer and shit:http://www.usa-importservice.de/The idea behind them is simple: they collect your shit at a depot in Texas, and once a month, a container travels from Texas to Hamburg...and they then ship it on to you with DHL inside of Europe. I recently had three oscilloscopes shipped to me for like 265€ including customs.Of course, there is a disadvantage too. They are SLOW as MOLASSES. Expect two, maybe three months turnaroundtime...TamP.S. THis is NOT commercial. I am but a paying customer of USA Importservice, and WILL provide notarized proof of my accounts gladly if needed.
Ballantine 5500A counter, seeking info/manual/programming guide - Page 1
Forum section: electronics / general

author: zike
author_rank: Contributor
timestamp: December 28, 2017, 03:19:41 pm
content: EDIT: This topic was misplaced, it's now been movedhereunder the Test Equipment forum. Tx, Z.Hoping someone has a manual gathering dust to loan/scan/sell. Docs for similar 5500B (later, non-Nixie tube) may serve. Usual boat anchor sources came up dry.Thebrochureindicates the unit is "fully programmable" by way of a single contact closure on the rear panel (two banana jacks!!).It's a really a nice instrument, very glad I rescued it from the bin (just one shorted electrolytic), but that so-called 'programming interface' has really piqued my curiosity...Did I mention that it's "ACCUMETRONIC"
video: Ronald Resch  - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 28, 2017, 10:36:45 am
content: This is the guy behind the engineering of the Vegreville Egg.https://en.wikipedia.org/wiki/Vegreville_eggQuite an interesting topic, at least to me!https://youtu.be/imlMspPKfNo(fixed typo)
Heathkit IT-12 Visual Aural Signal Tracer Repair - Page 1
Forum section: electronics / general

author: jcrubin
author_rank: Frequent Contributor
timestamp: December 25, 2017, 02:27:38 pm
content: Here is a short video series that documents work that I did on this IT-12, very much like the series I did on the T4 but more condensed. In this series though more attention is made with regard to the power supply and replacing the single diode with a modern full bridge rectifier.Part 1 of 2

author: jcrubin
author_rank: Frequent Contributor
timestamp: January 01, 2018, 01:28:34 pm
content: Part 2 of 2
rant: furniture stupidity - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 27, 2017, 11:26:19 pm
content: Why can't office chair manufacturers decide on a pin size for the caster wheels?

author: Rick Law
author_rank: Super Contributor
timestamp: December 27, 2017, 11:53:29 pm
content: Quote from: Alex Eisenhut on December 27, 2017, 11:26:19 pmIn US-Imperial units or metric? Just that alone is troublesome.Then, for someone very petite, well, may be a quarter inch would do nicely. You can make a designer eye catching design of a chair. These days, form is as important as function, and nicer looking chair could bring in a premium even if it is still junk.On the other hand, for someone middle-age with extra extra fat stored around the mid-section, you know, individual who triggers earthquake sensors as he/she walks, those with the bio-mass of an army but still supported by just one single pair of feet... perhaps a 1-inch solid steel is needed at least for the appearance of the strength.

author: DimitriP
author_rank: Super Contributor
timestamp: December 28, 2017, 04:34:50 am
content: Quote...but then you could use the old casters from your out of warranty chair to fix the replacement out of warranty chair.How does any of this generate new chair sales ?You could also wonder why since they go to all the trouble to build a chair, why they don't use better foam that doesn't go flat after a couple of months , or better fabric that doesn't fall apart right after the foam goes flat ...it's a slippery slope

author: Muttley Snickers
author_rank: Unknown
timestamp: December 28, 2017, 04:55:01 am
content: Quote from: Alex Eisenhut on December 27, 2017, 11:26:19 pmThe shaft length is also a factor worthy of attention in addition to the diameter as not all receptacles are the same.

author: Keicar
author_rank: Regular Contributor
timestamp: December 28, 2017, 05:09:38 am
content: Obligatory XKCD reference:https://xkcd.com/927/

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: December 28, 2017, 09:19:58 am
content: Quote from: Alex Eisenhut on December 27, 2017, 11:26:19 pmThat is a deep and complex question.One could also ask, "why isn't there one type of star?", or "why doesn't Nature make just one type of bird?" That makes me suspect that the same rules that apply to the Natural world may also apply to the human domain.Actually, I would be gobsmacked if they didn't.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: December 28, 2017, 10:04:52 am
content: If that made sense, I'd like to know. Where are stars and birds manufactured?

author: R005T3r
author_rank: Frequent Contributor
timestamp: December 28, 2017, 10:10:51 am
content: it would be like IKEA made easy...
CRT ti LCD coverter - Page 1
Forum section: electronics / general

author: stanko
author_rank: Newbie
timestamp: December 27, 2017, 01:31:16 pm
content: Hi, I have Tek 475A oscilloscope but CRT (filament )is ded, im loking for possibility to replace CRT with LCD display, If any one did such modification or have tech info please let me know.Stanko.

author: Yansi
author_rank: Super Contributor
timestamp: December 27, 2017, 01:42:40 pm
content: I think that the cost of such solution pays you a new DSO. Either find a replacement tube for the scope, or buy a new one. I do not think the Tek 475 is such a great scope that it would deserve so much work to be refurbished with a LCD.On the other hand I think that replacing any CRT using a LCD is possible, it all just depend on your skill, time and money you want to put into such solution.Y.

author: David Hess
author_rank: Super Contributor
timestamp: December 28, 2017, 12:00:24 pm
content: Replacing the CRT with an LCD means adding a pair of digitizers with one being 250 MHz which will be no small task.

author: Zero999
author_rank: Super Contributor
timestamp: December 28, 2017, 05:03:55 pm
content: In short, it's as easy as building a digital oscilloscope.Quite often the CRT can be replaced, which is fairly straightforward.

author: Yansi
author_rank: Super Contributor
timestamp: December 28, 2017, 05:27:55 pm
content: Even replacing the whole oscilloscope is nowdays quiet easy
Math nerds: Why does this happen? - Page 1
Forum section: electronics / general

author: apblog
author_rank: Regular Contributor
timestamp: December 27, 2017, 07:56:47 pm
content: So I came across this strange bit of math today.I needed to know the frequency of a 26ns period. Which turns out to be:38,461,538.461538(repeating). Ok, not that strange. Now multiply it by 4:153,846,153.846153(repeating). Same digits repeating, same order. Multiply by 4 again:615,384,615.384615(repeating). And again:2,461,538,461.538461(repeating). Now there is a leading 2, but the same digits repeat.How does this work? Why four? Why 26?Just curious if there is an interesting math principle at work here. Just dumb coincidence?I'm not that great at math so apologies if this is something really basic.Thanks!

author: Decoman
author_rank: Regular Contributor
timestamp: December 27, 2017, 08:18:27 pm
content: I don't know much about math but this seems familiar. Maybe related to 'cyclic numbers'https://en.wikipedia.org/wiki/Cyclic_numberMaybe fractions and multiplication in a way being two sides of the same coin so to speak, in a decimal number system. *shrugs*In the video, it is stated that some third of all the prime numbers "will produce cyclic numbers".At the end of the video, the guy mention something called 'enneagram'.https://en.wikipedia.org/wiki/Enneagram_(geometry)Various related youtube channels:numberphilecomputerphilesixtysymbolssingingbanana

author: RoGeorge
author_rank: Super Contributor
timestamp: December 27, 2017, 08:35:37 pm
content: Any periodic (repeating number) multiplied with any other number will produce a similar result, because multiplication is repeated addition.As a general rule, combining any pattern with itself will also give a pattern.

author: chriswebb
author_rank: Unknown
timestamp: December 27, 2017, 09:20:28 pm
content: Quote from: apblog on December 27, 2017, 07:56:47 pmWhat you are looking at is just a quirk of dividing by 26 (really 13).1 000 000 000 / 26 = 38,461,538.461538 | 1 000 000 000 mod 26 = 124 000 000 000 / 26 = 153,846,153.846153 | 4 000 000 000 mod 26 = 2216 000 000 000 / 26 = 615,384,615.384615 | 16 000 000 000 mod 26 = 1064 000 000 000 / 26 = 2,461,538,461.538461 | 64 000 000 000 mod 26 = 14So none of these numbers are congruent mod 26. And definitely not congruent mod 13.While one of these repeating terms may represent a cyclical number (haven't found one yet), 1/26 isn't cyclical nor are the others i checked.You can look at the different fractions of 26 from 0/26 to 26/26 to see what the repeating decimals will be.And when you get to a multiple of 13 like 63 999 999 999 you get either .5 as the decimal or nothing because its divisible.I don't really see anything interesting here, because its not like it is ALWAYS the same. So mostly I'd just attribute this to a quirky decimal representation. But it's been a while since number theory.

author: apblog
author_rank: Regular Contributor
timestamp: December 27, 2017, 11:17:53 pm
content: Thanks everyone.
Apple G5 Temperature Sensor Identification  - Page 1
Forum section: electronics / general

author: Bskitter
author_rank: Regular Contributor
timestamp: June 30, 2017, 08:16:32 am
content: Hello All.I am building an ATX PC with an old G5 case. Apon stripping the case of all the internal I came across a couple of Temperature Sensors.I then had the idea to leave these in their orginal place and somehow implement them in the new build with an Arduino or something similar.Here is the actual board.The little IC is labled "7752" with a Capacitor and Resistor. This type of configuration looks similar to the 1 wire thermo sensor like a DS18B20.I have searched the internet for the data sheet on this component but have found nothing. Could it be a inhouse chip from Apple ?Byron

author: amyk
author_rank: Super Contributor
timestamp: June 30, 2017, 11:30:14 am
content: Google "7752" "sot23-5" and the very first result isthe datasheet for the DS1775.

author: Bskitter
author_rank: Regular Contributor
timestamp: June 30, 2017, 11:39:25 am
content: Thank you greatly ! I was just googling "7752" and trying different keywords like IC, Thermo, etc.just to clarify "sot23-5" is the package number ?

author: braincrush
author_rank: Newbie
timestamp: December 04, 2017, 01:28:24 am
content: did you have any luck reading the sensor please ?

author: Bskitter
author_rank: Regular Contributor
timestamp: December 27, 2017, 10:13:40 pm
content: No, I just replaced the boards with DS18B20 Breakout boards and used the included library to read the temps.
Quantum Weirdness Explained - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: December 25, 2017, 11:55:07 pm
content: https://www.smbc-comics.com/comic/quantum-weirdness

author: Zero999
author_rank: Super Contributor
timestamp: December 26, 2017, 04:43:03 pm
content: Quote from: TerraHertz on December 25, 2017, 11:55:07 pmWhy did god put that the age of the universe is only 6000 years in the bible, when observations suggest it's much older? Perhaps it was typo?

author: Lightages
author_rank: Unknown
timestamp: December 26, 2017, 05:02:13 pm
content: I am wondering if we really need to start another belief war here.

author: TerraHertz
author_rank: Super Contributor
timestamp: December 27, 2017, 02:10:00 am
content: We don't. Also, medieval monks didn't make typos. When they weren't corrupting texts by mistranslating them, they routinely obliterated priceless manuscripts from Antiquity, covering them with their pointless memetic religious blather. For instance the story of the Archimedes Palimpsest.https://en.wikipedia.org/wiki/Archimedes_PalimpsestArchimedes lived c.287 – c.212 BC. His work The Method of Mechanical Theorems used mathematics close to modern Calculus. It was overwritten by 13th century Christian monks, short of writing materials. The story of how most of that work was recovered is fascinating. And how close it came over and over to being lost completely, is enough to make you cry.How much further advanced would we be today, if ancient scientific works like that were not lost in their time?
The Best Christmas Advert of 2017 - Maybe - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: December 23, 2017, 11:42:01 am
content: I normally ignore cinema and TV advertising but once in a while something special comes along. There is a German electronics retailer called Media Markt and this is the advert they have created to show their Christmas goodies.https://youtu.be/V1zTJIfGKaAI'll never look at a garden gnome the same way again

author: nctnico
author_rank: Super Contributor
timestamp: December 23, 2017, 01:28:51 pm
content: LOL!

author: SL4P
author_rank: Super Contributor
timestamp: December 25, 2017, 09:30:21 pm
content: Perfect concept and execution...Love it!
Identify 3 Pin Connector - Page 1
Forum section: electronics / general

author: l0rd_hex
author_rank: Regular Contributor
timestamp: December 21, 2017, 11:52:02 pm
content: Hi folks,Does anyone know the proper name for this style of connector? There are some bayonet lugs on the side. It's from a Topcon SL-7E Slit Lamp.Thanks!

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 22, 2017, 12:31:06 am
content: That looks a lot like something from Tajimi Electronics:https://ssl.tajimi.co.jp/english/http://www.marshall-usa.com/cables/tajimi_connect/tajimi.html

author: BBBbbb
author_rank: Unknown
timestamp: December 22, 2017, 12:45:32 am
content: Maybe:https://www.digikey.com/product-detail/en/hirose-electric-co-ltd/RM15WTPZ-3P-71/H124370-ND/5134382I might have the service manual or spare parts list somewhere, but won't be able to check before Wednesday.Measure the diameter, that could help.

author: Halcyon
author_rank: Unknown
timestamp: December 22, 2017, 06:46:51 am
content: It looks a lot like those 3-pin connectors they use for hand held speaker/mic's on some consumer two-way radios.http://www.altronics.com.au/p/p0949-3-pin-female-line-microphone-connector/

author: tautech
author_rank: Super Contributor
timestamp: December 22, 2017, 06:54:06 am
content: Quote from: Tomorokoshi on December 22, 2017, 12:31:06 amYep, looks just like R05 with bayonet retaining pins.http://www.marshall-usa.com/cables/tajimi_connect/circular_connect/circular_on/r0135.htmlInsert # 6 - 3

author: l0rd_hex
author_rank: Regular Contributor
timestamp: December 26, 2017, 06:47:03 am
content: Thanks everyone!I think it might be a Hirose connector, there is a tiny "HR5" printed at the bottom along with a J off to the side (Japan?).Here's some measurements:Outer width: 13mm (?)Inner connector width: 7mm (?)Height: 6mm (?)
Resistor Divider Spreadsheet - Page 1
Forum section: electronics / general

author: Bootalito
author_rank: Unknown
timestamp: December 25, 2017, 04:00:53 am
content: I made a resistor divider spreadsheet to help me while doing some design work.What makes this one different and hopefully more useful:1. You input the resistor values and trim pots you actually have on hand on another tab.2. It takes into account a trim pot that is a part of R1 as per the schematic below3. You choose a value of R2 and a desired trim percentage and it will choose trim pot value and R1 value based on the resistor values you enter (using a simple Vlookup type search)4. It does error checking such as making sure you've met your desired trim percentage, and calculates worst case R1 and R2 resistor tolerances and tells you if you have enough R1trim to trim it back to the desired Vout.https://www.dropbox.com/s/npv1ypg16oz1qeh/Resistor%20Divider%20Calculations.xlsx?dl=0