hybridfree/eevblog-posts huggingface dataset:
Spekers wih no box or cone: using materials to make (great) sound - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 23, 2018, 07:00:58 pm
content: https://youtu.be/zdkyGDqU7xAThis is great idea. I always wanted to figure out how to make your walls into speakers using the empty space between studs where you would put in a large box, but this is a better idea.If they purposely made a foam or ather material for speaker you could see all speakers made like this in the future. Doesn't seem to have the compromises you make with regular speakers. I wonder how good you get the sound if you took the drivers out of really high end speakers. He is just using really cheap ones.This is also one of the best tech youtube channels as this guy is a genius with lots of money to spend on the hobby.

author: thm_w
author_rank: Super Contributor
timestamp: August 23, 2018, 07:28:06 pm
content: Yeah this guy has great insight and good production as well.
Youtube notifications comments rigged? - Page 1
Forum section: electronics / general

author: b_force
author_rank: Super Contributor
timestamp: August 23, 2018, 12:55:12 pm
content: Forgive me if this has already be mentioned on the forum somewhere, I couldn't find it.Do more people have issues with notifications on people that reply to comments?Since a couple of weeks it doesn't seem to work for me anymore.Which is EXTREMELY annoying, since I now manually need to check certain videos.And yes, in my profile settings notifications is turned on.
Negative absolute pressure? How it can be? - AUTOSOLVED - Page 1
Forum section: electronics / general

author: Zucca
author_rank: Unknown
timestamp: August 23, 2018, 08:25:40 am
content: Guys,Iamwas doing something wrong but I don't know where. It's a very simple physics problem.I have a bucket on the ground full of water. On the water surface there is 1 Bar of atmosferic pressure.Now I take a 20meter pipe open in one end and I fill it with water.Now I submerge the open pipe end in the bucket and I keep the 20 meter pipe full of water vertical.Let's think about the hydrostatic pressure in the pipe.10meter water are 1 bar, so at the 10 meter high I have 0 bar absolute. But if I move higher I go negative?What is the absolute pressure on the top of the pipe?-1 Bar? So below the vacuum, ehh?ahh while I was writing it I got it...In a static condition the pressure difference of 20meter water top-bottom are 2 bar.The 1 bar on the bucket water surface can't keep op with the 2 bar of the water.... so at equilibrium I have th e first 10meter pipe full of water and the rest is vacuum.Basically when I submerge the pipe, I create an atmosferic barometer... because the 10meter water on the top flows down in the bucket creating vacuum.Sorry for posting this but I had already almost written it up.

author: tautech
author_rank: Super Contributor
timestamp: August 23, 2018, 08:41:49 am
content: I think any of us that have been around here for a while have deleted a post/thread just before posting as after proof reading we see what was staring us in the face and we couldn't damn well see it.I know I have.As they say sometimes; one can't see the wood for the trees !When it happens, don't ya just feel like doing this:

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 23, 2018, 12:29:14 pm
content: Once the pressure goes below the boiling point of the water at its current temperature, the water will boil.

author: Zucca
author_rank: Unknown
timestamp: August 23, 2018, 01:16:32 pm
content: Mike, I was going to post that. So I assume above water it's not vacuum but H2O vapour.Dammm it... it's just a bucket and a pipe. How can it be so complicated....
Guess what is this? - Page 1
Forum section: electronics / general

author: gamalot
author_rank: Super Contributor
timestamp: August 22, 2018, 08:26:57 am
content: I just saw them in taobao.com, honestly, I didn’t recognize them at first sight.

author: Ian.M
author_rank: Super Contributor
timestamp: August 22, 2018, 08:54:48 am
content: Answer:Brand new original ELNA RJE 25V 4500UF high temperature capacitor with capacitor bracket(select to view)

author: gamalot
author_rank: Super Contributor
timestamp: August 23, 2018, 12:10:42 am
content: Quote from: Ian.M on August 22, 2018, 08:54:48 am
Upcycled Electronic Parts Creations - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: August 19, 2018, 04:23:39 pm
content: Never mind the cheesy music, at least worth a watch for the stuff, even if a few have been on here before.

author: amyk
author_rank: Super Contributor
timestamp: August 20, 2018, 12:39:00 am
content: More art than anything else......and "upcycled": because the word "reuse" isn't "trendy" and hipster enough.

author: duak
author_rank: Super Contributor
timestamp: August 21, 2018, 04:55:17 am
content: Honeywell comissioned some objet d'art for ads in the the mid 70's. Google "honeywell animals".eg.http://www.computerhistory.org/atchm/honeywell-animals/I thought they were kind of neat. My favorite is attached.
Where are my sent messages? - Page 1
Forum section: electronics / general

author: RichardK
author_rank: Regular Contributor
timestamp: August 20, 2018, 01:17:56 am
content: I have been corresponding with folks on here for years, all of a sudden my sent messages are POOF gone, where the F are they? All my received messages are still there but none of the relevant sent messages? Can an admit tell me what the hell is going on?

author: David Hess
author_rank: Super Contributor
timestamp: August 20, 2018, 04:24:07 pm
content: Doesn't the forum erase them after a year or something? Mine have been gone a long time.

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 20, 2018, 06:11:07 pm
content: My sent messages are all (?, at least back to 2013) still there, but I noticed that the 'thread' style presentation has been broken for the older ones.What do you see when you navigate to messages and then messages -> sent items?

author: xrunner
author_rank: Super Contributor
timestamp: August 20, 2018, 06:24:47 pm
content: Quote from: David Hess on August 20, 2018, 04:24:07 pmNo. Mine are all there going back to 2013.

author: David Hess
author_rank: Super Contributor
timestamp: August 20, 2018, 07:34:23 pm
content: Quote from: PA0PBZ on August 20, 2018, 06:11:07 pmMy oldest sent messages are gone. I remember looking for them at one point to find something I wrote and discovering them to be missing.I just assumed that the forum removes them after so long, presumably to save resources.

author: metrologist
author_rank: Super Contributor
timestamp: August 20, 2018, 07:58:39 pm
content: There is a checkbox below the text box: "Save a copy in my outbox"I only remembered to check that box one time, a couple years ago, and that message is the only one in my sent items.Ironically, there is no outbox that I could find. Another forum actually has an outbox, where messages will sit until the recipient opens them, and then move to sent items.
Rigol DS1054 vertical zero? - Page 1
Forum section: electronics / general

author: pauledd
author_rank: Regular Contributor
timestamp: August 19, 2018, 06:40:15 pm
content: Hi thereI am a very noobish electronics hobbyist and I got my new DS1054.While getting warm with the new device I am just wondering why I get about 80mV reading Vpp / Vmax with vertical set to 1V and connected nothing else to the scope and default settings. As I go down with the voltage the readings go down too.Is this expected with oscilloscopes? I know I should not use an oscilloscope as multimeter, but I am just curious about it.And another observation: I would expect the line sitting right on "0" on the grid if nothing is connected and vertical pos. is reset. But it looks like the line "sits" on top of the vertikal 0V gridline... Let me guess, this is nitpicking?

author: ataradov
author_rank: Super Contributor
timestamp: August 19, 2018, 08:59:54 pm
content: On a totally open probe almost any reading is normal depending on your environment. You need to at least short the probe to ground to get some baseline noise measurement.I believe the trace offset was fixed in the latest firmware update, but I have not tried it myself. I'm not bothered by small stuff like this.

author: pauledd
author_rank: Regular Contributor
timestamp: August 20, 2018, 07:31:10 am
content: Shorting to ground did not help but as you said I should not care on that small stuff.I just watched a bunch of DS1054 youtube videos and the little vertical offset seems to be commonon all scopes... The vertical label is exactly on zero but the signal "sits" everywhere on top of that...

author: nugglix
author_rank: Regular Contributor
timestamp: August 20, 2018, 08:33:52 am
content: First, you should learn to use the built-in screen-capture function.That photo is close to useless.

author: tom66
author_rank: Super Contributor
timestamp: August 20, 2018, 11:33:21 am
content: Yes, it's normal.You're seeing the ADC's quantisation and noise floor.Say the noise floor is 1-2 LSBs at 25'C, on an 8V range (1V/div, 4 divs either side of zero) that would be 63mVp-p of noise.So this seems quite normal to me.

author: Ducttape
author_rank: Regular Contributor
timestamp: August 20, 2018, 05:06:38 pm
content: I think you'll enjoy this video of Dave's.
Diode For Hitachi Excavator - Page 1
Forum section: electronics / general

author: GigaJoe
author_rank: Frequent Contributor
timestamp: August 20, 2018, 12:16:07 am
content: https://www.ebay.com/itm/-/222788704746Resistor for a crane?Zener diode for a Russian tank?Seems I missing a huge opportunity in some trade field ....

author: amyk
author_rank: Super Contributor
timestamp: August 20, 2018, 12:25:39 am
content: A quick Google shows that it's a 3A diode in a plug-in connector.Some discussion...https://www.heavyequipmentforums.com/threads/hitachi-ex200-2-diodes.66972/
I don't think you should trust your money to this guys "technical analysis"WTF - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 19, 2018, 06:33:48 pm
content: I was just amazed at this. For those of you who don't know who this guy is: His name is Trevon James and bitconnect got him to take the fall for the largest ponzi in crypto and really this century. The original creators of bitconnect got the hell out of what ever country they were wanted in and it left this guy constantly making youtube videos even after he was indigited for securities fraud. He is a prosecutors dream and a very easy target to make an example out of. He didn't even have a lawyer and he's certainly not listening to the one he has.It's like watching Beavis and butthead do technical analysis: "Duh this is er ah hehe support and um this is when you should have er bought er no sold heh heh er and we er need some more er support." Imagine what a stock broker looks like, imagine giving your life savings to that person. Now imagine this guy is your broker. He makes Wu-Tang financial look like your investments ain't nothin' to fuck with. If you are dumb enough to invest based on what this guy is telling you as he's out on bail for securities fraud, you don't deserve to have money. Well in reality he's not really saying much more then umm and err ahh so... I have a feeling he will go to jail for years since there really is no one else for the feds to go after besides this other guy that looks and sounds just like him.Its just amazing... I'm truly at a loss for words.https://youtu.be/y-zajUg9TdwAnd that's a face only a mother could... Punch.
not even free shipping - Page 1
Forum section: electronics / general

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: August 18, 2018, 03:58:00 pm
content: https://www.ebay.ca/itm/Quartz-crystal-ball-The-200-year-old-orbuculum-in-which-fate-and-the-dead-appear/302822670840?_trkparms=aid%3D333200%26algo%3DCOMP.MBE%26ao%3D1%26asc%3D20140728113831%26meid%3Dad5ab8bdb5474128a29cfc3ca9d5309b%26pid%3D100148%26rk%3D2%26rkt%3D4%26sd%3D192625592455%26itm%3D302822670840&_trksid=p2059210.c100148.m2813

author: JacobPilsen
author_rank: Regular Contributor
timestamp: August 18, 2018, 07:57:51 pm
content: Ha nem tudom.
pictures of modern military electronics PCB? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 18, 2018, 12:55:05 am
content: Does anyone have pictures of modern high tech military electronics, like the ones used in recent fighter planes, radios, etc?I never actually saw modern stuff that is used in field hardware. Don't really care where its from or what it is, but I want to see how something comes out looking when all those guidelines for milspec are met/followed.I have seen a few PCBs, like the ones that mikes electric stuff tore down, and some commercial stuff that was adopted by the military, but I don't think it will be the same as a PCB that is inside of a modern missile, f22 raptor, etc. I have also seen potted stuff that is milspec, like power supplies, but they are rather uninteresting unless you like heat sink chassis/mechanical design.Does anyone have some (declassified) stuff to share? Preferably from a first world country that does not skimp heavily on defense budgets.Built from the ground up by people who had military use in mind, not stuff that was 'tweaked' to meet standards.Is stuff from NASA similar?

author: bd139
author_rank: Super Contributor
timestamp: August 18, 2018, 08:54:24 am
content: Most of it doesn’t look any different to the usual commercial stuff these days. The packages are generally slightly larger due to derating and that’s it. Extended temperature or higher quality packages are used for ICs which are interesting but that’s about it. A lot of the guidelines were due to large TH devices with a significant mass which needed to be bonded correctly and then the entire board was conformal coated afterwards. This isn’t the case these days due to modern production techniques. The boards and parts are much lower mass.Look for tear downs of mobile phone mast equipment. Looks roughly like that.Edit: to note that the PCBs I was reworking in the late 1990s were far lower quality than the $10 box of 10 you can get from China from JLC etc these days.

author: coppercone2
author_rank: Super Contributor
timestamp: August 18, 2018, 01:31:30 pm
content: you mean like the grade of epoxies / resin / fiberglass /etching process used?The technology just got that much better?I have only seen basic control systems for use by military and it looked identical to commercial gear but they liked to use a more robust potted power supply that was a little brick rather then your typical tin can with vent holes/screw terminals (I guess its just a potted lambda with better input protection), for avionics useI got a atomic clock from a phone mast, which I have taken apart. It has those 'features' like multilayer PCB stacks joined by headers/connectors, like what I see is common in the missile electronics teardowns on youtube from the 1970's, in order to have some kind of specific high density shape that is still repairable.I was kinda wondering if it would be more pleasant and relaxing to design things like that because it looked visually better, guess its not like working in the MET and staring at art all day
Tesla suing Ontario government  - Page 1
Forum section: electronics / general

author: Bud
author_rank: Super Contributor
timestamp: August 21, 2018, 03:07:53 am
content: Tesla suing Ontario government over cancellation of electric vehicle rebates.We have a new elected premier in Ontario province, a no-shit guy who has taken several drastic measures scrapping the previous liberal government laws and programs. Among others are the so called Green initiatives that provided rebates of different types. One was the rebate for buying electric vehicles. Grandfathering was granted to those residents who paid or was going to pay for delivery of an electric vehicle by a certain date, but only if it was bought via a authorized dealership. Tesla does not have a dealer in Ontario and sells vehicles directly to consumers. Because of that , rebates for Tesla vehicles were halted in July. Musk is fuming all over that, crying for lost sales. Ironically, the new Ontario premier's last name is Fordhttps://globalnews.ca/news/4392076/tesla-ontario-government-rebate-lawsuit/The rebate amount blows my mind ($14,000 max). I cant get it why someone who buys a 70-100K car should be getting a rebate. The idea of a rebate on luxury items is atrocious. I am hoping Liar Musk will get a boot in Ontario Court.
Has any one got experience with GVIF, datasheet required - Page 1
Forum section: electronics / general

author: bob225
author_rank: Frequent Contributor
timestamp: August 18, 2018, 10:30:57 am
content: Has any one got any experience with Sony Gvif (automotive) I'm looking for a lower cost method of Gvif pass through and means to either inject a osd or switch between signalsI also can't seem to find the Datasheet (full technical one) for the Sony CXB1458R Rx Chip (I have spent hours going around in circles and ending up at the same places or alldatasheet)Any help appreciated.
Mr. Carlson reviews a Vacuum Tube Opamp module. - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: August 11, 2018, 11:20:09 pm
content: Here you go:

author: vk6zgo
author_rank: Super Contributor
timestamp: August 13, 2018, 01:19:29 pm
content: Interestingly, similar modules were used to provide bistable multivibrators for digital dividers.From memory, they used 12AT7s rather than the 12AX7s used in the Op-amp.

author: cpuerror
author_rank: Regular Contributor
timestamp: August 16, 2018, 09:16:52 pm
content: I wish he would get invited to be a guest on the amp hour.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 16, 2018, 09:41:13 pm
content: Maybe few of heard of it, but anyone who followed Bob Pease should know these well. He cut his teeth on them and talked about them in several of his blurbs on analog design.
Short video about "WORM" Rotterdam-based analog performance space/scene - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: August 16, 2018, 02:48:01 am
content: Look at all Dennis Verschoor's equipment. I like his 'music', it's strangely calming to me, like listening to random HF sounds is. It's clearly influenced by the stuff you hear on the shortwave bands.It looks like a lot of fun. What kind of equipment are the huge green devices with the large vernier dials?http://cdm.link/2018/08/immerse-yourself-in-rotterdams-sonic-voltages-in-the-worm-laboratory/also

author: helius
author_rank: Super Contributor
timestamp: August 16, 2018, 03:16:03 am
content: Quote from: cdev on August 16, 2018, 02:48:01 amhttps://en.wikipedia.org/wiki/Beat_frequency_oscillatorhttps://en.wikipedia.org/wiki/Wobbulatorhttp://djjondent.blogspot.com/2014/06/bruel-kjaer-beat-frequency-oscillator.htmlThere are also B&K random noise generators in the video etc.
Phase-shift transformer types single core vs double core - Page 1
Forum section: electronics / general

author: nForce
author_rank: Frequent Contributor
timestamp: August 14, 2018, 04:00:18 pm
content: I have a question regarding phase-shift transformers or sometimes called quadrature booster.What is the difference between single core and double core phase shift transformer? On the web there is so little literature about this.

author: nForce
author_rank: Frequent Contributor
timestamp: August 15, 2018, 06:16:09 pm
content: Anyone?

author: coppercone2
author_rank: Super Contributor
timestamp: August 15, 2018, 10:51:57 pm
content: I have some phase shift transformers, from corning I believe. I would like to more know about them too.Mine are little black potted boxes that specify phase angle and stuff on them, like cos/sin outputs. I thought it was maybe a potted TLC network.
New TV channel breaks Samsung TVs in country South Australia - Page 1
Forum section: electronics / general

author: station240
author_rank: Unknown
timestamp: August 15, 2018, 02:12:37 pm
content: http://www.abc.net.au/news/2018-08-15/samsung-tvs-turning-themselves-off-in-sa/10119962QuoteNasty bug this, add a new channel to an existing transmitter, and a variety of TVs from one manufacturer stop receiving signals.My guess is the software has gotten confused as to what region it's in, perhaps even what country.
How do you start a fire with a hammer - this topic is not for you, Thor! - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: August 14, 2018, 04:49:41 pm
content: Thats a lot of energy slammed in that poor piece of steel!!My arm would fall off. :-)

author: jmelson
author_rank: Super Contributor
timestamp: August 14, 2018, 07:47:03 pm
content: Quote from: RoGeorge on August 14, 2018, 04:40:36 pmTake a piece of paper, sprinkle a little gunpowder on it, and whack it ONCE with a hammer, and it will be ignited.Jon

author: In Vacuo Veritas
author_rank: Frequent Contributor
timestamp: August 14, 2018, 07:50:37 pm
content: https://en.wikipedia.org/wiki/Fire_piston

author: amyk
author_rank: Super Contributor
timestamp: August 15, 2018, 12:29:14 am
content: Rough calculation:~100g of steel~1000K temperature rise~500 J/kg-K~50s-> ~1kW of energy inputRelated:

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 15, 2018, 12:39:30 am
content: Quote from: amyk on August 15, 2018, 12:29:14 am1kW is kind of ridiculous for a human arm. But 100W, maybe 200W for a seasoned smith, would be typical, and that's not at all far off, as rough calculations go. Probably the ~5x difference lies in the mass (that was probably more like 20g of steel being beaten) and temperature (the red-orange heat seen is probably closer to 500C temp rise).Which is also to say, it's not something my weedy, unpracticed arms could pull off, but something you need to have practice at -- not only for swinging hard and often, but to have the confidence and precision in placing the blows.I thought that was an urban legend, lighting the forge with the hammer and steel. Cool to see it, thanks!Tim

author: amyk
author_rank: Super Contributor
timestamp: August 15, 2018, 02:23:32 am
content: Quote from: T3sl4co1l on August 15, 2018, 12:39:30 amhttp://www.smex.net.au/reference/SteelColours02.phphttp://www.blksmth.com/heat_colors.htm500C is barely glowing. In the video he got it closer to orange which is in the 900-1000C area.Your estimate on the mass is better than mine, now that I look at the more closely --- steel is ~8g/cm^3 and there was 3-4 cm^3 there. Some further Googling and ~100-200W is within the usual ability of a human arm for a short period of time.

author: innkeeper
author_rank: Unknown
timestamp: August 15, 2018, 02:32:40 am
content: the concept of flint and steel is not that the flint creates the sparks, but the steel does

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 15, 2018, 06:20:37 am
content: Oops, I let the kelvins confuse me into a circle there... I should've said more like 750C.Tim
What kind of weird motor winding is this? - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: August 13, 2018, 02:59:33 am
content: Ok, I was watching this motor stator winding machine youtube video and at the end, this weird type of stator winding appeared. It obviously looks like a pancake motor, but, it has an inner set of coils, then an outer set closer to the edge. What in the world is this? It's almost like it is being designed for 2 different RPMs, or torque, or, what kind of VFD would this motor require? This is so off the world to me and unexpected...https://youtu.be/C6qhP6mO2EM?t=622Can anyone say how this motor would work or be driven?My guess is a weird 2x2 phase system like a gigantic stepper motor, but, wouldn't part of the drive be less efficient than the other?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 13, 2018, 03:45:23 am
content: Hmm, two phase motor? Multispeed, could be? Where else do I... ah, yes!https://www.google.com/search?q=ceiling+fan+winding&tbm=ischMultispeed, slow (lots of poles), low power, most often box and ceiling fans.Should be a shaded pole on there (later step?), or it's using the difference in resistance of the windings, or there's a run capacitor (split phase type).Tim

author: BrianHG
author_rank: Super Contributor
timestamp: August 13, 2018, 03:54:48 am
content: Quote from: T3sl4co1l on August 13, 2018, 03:45:23 amThankyou Tim. You have found the one type of motor I have never torn apart as a kid or adult. I thought it was weird that the super high number of turns all connected in series made for a high voltage motor which would also allow slip without overheating at 120v or 240v. I should have figured a variable speed fan motor, but my lack of imagination on where such a pancake motor was used eluded me.
Rockby Electronics (AU) 1-day sale - Ends 1600hrs Tues. 14/08/2018 AEST - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: August 13, 2018, 05:00:50 am
content: http://www.rockby.com.au/Rockby/Mailer/MADD3318_1.cfm
FOSS Android 4.2.2 audio player with speed control and position memory - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: August 14, 2018, 10:52:05 am
content: Google doesn't helped me much with this. Also, I am using Android only when there is no other option, so it might be an obvious answer that I'm missing.Is there any Android audio player (mostly for audiobooks converted to mp3 format) that can do these:1. Works on Android 4.2.2 (Jelly Bean)2. Can remember the position for each file when closed (multiple audiobooks, each with its own bookmark)3. Can alter playback speed4. Can install and work offline5. Does not require unnecessary access rights6. Free, no ads or data harvesting, Preferably FOSSSometimes it is one very long mp3 file per each book, sometimes it is a folder with many mp3 files (about half an hour each) for each book.What player do you recommend for audiobooks already converted into mp3 files?

author: RoGeorge
author_rank: Super Contributor
timestamp: August 14, 2018, 04:01:53 pm
content: Finally, found one: "Voice", by Paul Woitaschek, thank you!Download APK:https://f-droid.org/en/packages/de.ph1b.audiobook/GnuGPLv3 project:https://github.com/PaulWoitaschek/Voice
Siemens FZJ 101 info/replacement? - Page 1
Forum section: electronics / general

author: The Soulman
author_rank: Super Contributor
timestamp: August 12, 2018, 11:59:49 am
content: I have device with a failed fzj101, they are available on aliexpress but might ask here first.It's some logic device in dip16 powered from a 15V rail (7815).Anybody has info (datasheet) or suggestion for a equivalent part?

author: amyk
author_rank: Super Contributor
timestamp: August 12, 2018, 04:53:39 pm
content: First page of search results for FZJ101...http://mirror.thelifeofkenneth.com/lib/electronics_archive/SiemensAnalogIntegratedCircuitsDataBook1976-77_text.pdfIt's a "JK-master-slave-flipflop with two J and K inputs" of the "LSL" logic family...https://de.wikipedia.org/wiki/Langsame_st%C3%B6rsichere_Logikhttp://www.ic-ts-histo.de/fad/ics/lsl/lslvergl.htmPerhaps the Germans here can find more information than me.

author: The Soulman
author_rank: Super Contributor
timestamp: August 12, 2018, 06:15:05 pm
content: Thanks Amyk, didn't find those links myself.Huhm, I think I throw the entire board out (24V dc motor speed control).And replace with something more modern..
Various physics experiments and apparatus - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: June 25, 2018, 07:26:00 am
content: For the love of (history of) physics experiments, this YouTube channel is gold:https://www.youtube.com/user/xofunkox/videosIt is full of very clean experiments with vintage apparatus, but sometimes shows less known effects demonstrated with current days available objects:The vintage apparatus are a great example of good engineering, a joy to watch for their simplicity, ingenuity and craftsmanship, all in good condition and still working:And oscilloscopes are overrated:

author: ataradov
author_rank: Super Contributor
timestamp: June 25, 2018, 07:55:14 am
content: Watched Applied Science recently?

author: RoGeorge
author_rank: Super Contributor
timestamp: June 25, 2018, 09:04:10 am
content: Yep, that's where from I got the link for the Zeeman Effect video, and it turns out that the wholexofunkoxchannel is gold, IMO.

author: GlennSprigg
author_rank: Super Contributor
timestamp: June 25, 2018, 12:27:53 pm
content: That is the Beauty my friend, of the GOOD aspects of the era we live in now, the things we nowunderstand as an intelligent species, and the experiments we share on the 'SOMETIMES' blessed 'Internet !!!As in true life, we 'ignore' the boisterous & vexatious, and set our 'Filters' to stream in the friendly, andknowledgeable. We 'LEARN', and then we better 'ourselves' by re-SHARING that knowledge.YOU, have just added yourself to such a friendly search for knowledge. Sleep easy

author: RoGeorge
author_rank: Super Contributor
timestamp: June 25, 2018, 08:17:50 pm
content: Glad you like those.Seems like some of his experiments are from old journals of physics and chemistry. For example, in the description of the video "Automatischer Cartesischer Taucher,automatic Cartesian diver" is written:Quotewith Google translate,QuoteA search inside archive.org for "Journal of Physical and Chemical Education" does not return any documents, but searching for "Zeitschrift für den physikalischen und chemischen Unterricht" returns lots of PDFs.Unfortunately I don't speak German, but I guess there might be many more interesting experiments in those journals from 1800+.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 12, 2018, 03:18:52 pm
content: Magnetostrictive effect will produce small length variations in a wire (in the tens or hundreds of nanometers range).How do you measure nanometers with household items?What a clever setup!

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 12, 2018, 03:32:43 pm
content: One of the wonders of our age is that these experiments, which were on the bleeding edge of science a century ago, which usually required either a rich patron or a university lab to create and support, can now be duplicated by literally thousands of people in their home shops. The combination of resources and understanding available today is truly stunning.
Visiting Singapore and Kuala Lumpur: Any tips for test equipment purchase? - Page 1
Forum section: electronics / general

author: Bicurico
author_rank: Super Contributor
timestamp: August 10, 2018, 10:43:53 pm
content: Hi,Next week I will be visiting Singapore and Kuala Lumpur.I would appreciate some tips and advice on what to visit and do as a tourist.But what I *really* would like to know: are there any good shops to get second hand test equipment (spectrum analyzer, signal generators, etc.)?Seems like a good opportunity to get away with no shipping cost and custom issues. Not looking for anything in particular.I am interested in electronics, too. Wouldn't mind a chance to get a second hand/refurbished Samsung Galaxy Sx/Note x (got a very cheap Note 4 in Hong Kong three years ago).Googled and found Sim Lim Square in Singapore. Is it any good?Thanks!Vitor

author: nctnico
author_rank: Super Contributor
timestamp: August 10, 2018, 11:05:44 pm
content: Singapore: go to Sentosa Island.Other then that you could go onto Ebay and find some test equipment dealers from Singapore.

author: Bicurico
author_rank: Super Contributor
timestamp: August 11, 2018, 12:21:24 am
content: Thanks!Seems I am not off in my thinking:Sentosa Island was already on my list and I did try to find eBay listings from both locations, but unfortunately for me (and luckily for my wife), I did not find anything interesting. Yes, I did look for "other items" of sellers in these cities.Regards,Vitor

author: all_repair
author_rank: Frequent Contributor
timestamp: August 11, 2018, 12:28:33 am
content: Nothing much in Singapore. The rent is so high that the shops at SimLim is surviving on margin that people need them urgently. Anything else items are much cheaper online.
shapeoko 3 questions - Page 1
Forum section: electronics / general

author: firehopper
author_rank: Frequent Contributor
timestamp: August 11, 2018, 01:04:45 pm
content: has anyone bought one? I'm pondering getting one at tax refund time. thinking the dewalt spindle. which would bring the total up to around $1450 ish plus shipping. what are your thoughts and or experiences thanks.
Are there power inverters without roar cooling? - Page 1
Forum section: electronics / general

author: Artlav
author_rank: Frequent Contributor
timestamp: August 10, 2018, 02:10:08 am
content: I have a battery backed 24V DC wiring at home, which powers most low power stuff directly or via DC-DC converters.I also have a NAS capable of pulling 250W (always pulling 100W except when the disks are spun up), which is sensitive to power cuts and can't realistically be powered from DC directly.So instead of getting a separate UPS for it, i decided to just connect it to the 24V bus using a small inverter. Simple, right?Well, not really.After going through several 24V->220V inverters in the 300-500W range from different origins (noname ebay, MeanWell from Mouser, one from a local store) i found all of them to have a critical flaw.The flaw is that they all have a fan and this fan have only two modes - either quiet full off or roaring-loud full on.Therefore the question is - where can i find a 300+ watt, 24V->220V (110V works too, the thing got universal input) power inverter with a gradual fan control (or enough efficiency to not need a fan at all)?

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 10, 2018, 02:14:55 am
content: Just find a used APC that takes a 24V pack and wire it into your existing system.If the NAS uses an ATX type PSU, you could use buck converters run from the 24V.

author: David Hess
author_rank: Super Contributor
timestamp: August 10, 2018, 05:07:26 am
content: Quote from: NiHaoMike on August 10, 2018, 02:14:55 amCommon standby UPSes are not intended to operate continuously and may overheat. An online UPS or standby UPS which accepts external battery packs should be suitable but they usually include a fan also.Inverter design with a passive heat sink and no fan is tricky because of the high voltage isolation needed between the exposed heat sink and transistors. Maybe look for an old used one?

author: james_s
author_rank: Super Contributor
timestamp: August 10, 2018, 06:11:58 am
content: You could get or build a temperature controlled fan speed controller with a thermistor attached to the heatsink so it has continuously variable speed and only runs full blast if it has to. Look around for a quieter fan, maybe see if you can replace it with a larger slower turning fan that moves as much air.

author: Red Squirrel
author_rank: Super Contributor
timestamp: August 10, 2018, 10:45:38 am
content: I noticed that too. Seems they are setup to run the fan based on load instead of based on temperature. I have a 350w inverter in my shed to power the lights and accessory outlets and it sounds like a data centre in there if the lights are on and I'm charging a drill battery at the same time.

author: Dr. Photon
author_rank: Contributor
timestamp: August 10, 2018, 02:50:53 pm
content: If the server/NAS is using something similar to ATX, you might consider one of the PICO-PSU type products sold by Mini-box, or other "carPC" type PSUs. They are generally designed for putting a PC into a car, but they do have models that can work from 24 volts as well as 12.
How many pounds the structure with profile t bosh will tolerate? - Page 1
Forum section: electronics / general

author: Jasonbit
author_rank: Regular Contributor
timestamp: August 07, 2018, 09:54:54 pm
content: I know which this website/forum it is a place where talk about electronics but this subject is also related with world electronicsI am thinking build my own table to my lab electronic! I am thinking use profile T Bosh to do this:https://5.imimg.com/data5/FC/PL/MY-14147906/t-slot-aluminium-profile-500x500.jpgBut before I start dreaming about this I need know (at least have an idea) how many pounds dos this profile support. The structure will be basic. Something like that:https://snag.gy/ps23GN.jpg(Sorry to my poor scratch).All suggest will be welcome, thanks

author: rdl
author_rank: Super Contributor
timestamp: August 07, 2018, 10:11:11 pm
content: You probably need to ask the manufacturer. I know of a similar product called 80/20 which is pretty sturdy. You could look at their web site and see what has been made with their products. It might give you some ideas.https://8020.net/gallery

author: HighVoltage
author_rank: Super Contributor
timestamp: August 07, 2018, 10:36:15 pm
content: It does not only depend on the profile but mainly on how you use the profile in your construction.In general this is very good material to start a table.

author: Jasonbit
author_rank: Regular Contributor
timestamp: August 07, 2018, 10:49:23 pm
content: Quote from: HighVoltage on August 07, 2018, 10:36:15 pmWith my super skills to draw and knowledge mechanics I will try build a super stable table

author: Jasonbit
author_rank: Regular Contributor
timestamp: August 09, 2018, 10:39:44 pm
content: Hello folks,This guys, 8020.net, it is very professional. I send an email yesterday and they, almost after 20 hours, respond my email!I am trying drawing the table, through software and advices 8020 company. But, let me raise this question "What table height do you suggest to have a comfortable working position? I'm more or less 1.80 meters (5ft)"Thanks

author: GreyWoolfe
author_rank: Unknown
timestamp: August 10, 2018, 02:15:58 am
content: Why not build out of wood? Granted, it's not as cool looking or aesthetically pleasing but I bet it's a lot cheaper and still quite strong.
So whadayaknow.....flukes really do bounce quite well! Thankfully....phew! - Page 1
Forum section: electronics / general

author: Terry01
author_rank: Frequent Contributor
timestamp: August 09, 2018, 09:24:45 pm
content: I was messing about on my bench with some stuff today when a swivelled round to get another box and caught my 289 sweet! Real sweet...it went flying! It was up on the tilting bail so was a nice big target for me to catch properly with my elbow! It made an awful thud as I caught it then even worse as it landed half bouncing and half skidding on the wooden floor. I feared the worst and thought it was done for!It fell about 850mm so not quite a meter but it flew horizontally well over a meter! The first i knew about it was the whack as i hit it so it was a full on elbow to the face for my 289, poor fella! Or so i thought!I am happy to report the meter is fine! Not even a mark! To say i am delighted is....well ya know??

author: Cubdriver
author_rank: Unknown
timestamp: August 09, 2018, 09:34:06 pm
content: Fluke makes a fairly robust meter.Our esteemed leader tortures a 28-II.-Pat

author: chris_leyson
author_rank: Super Contributor
timestamp: August 09, 2018, 10:34:13 pm
content: My Fluke 73 hasn't done too well for 30+ years, unfortunately a big chunk of plastic on the front half of the case broke off and now it's held in place with some Araldite, nice grey super hard Araldite that matches the case colour nicely. Damn it, I hope the battery doesn't run out any time soon, it will need a lot of work with a hacksaw blade, scalpel and maybe a dremel to get the case halves apart. Grrr. There's a good spot about a third of the way up from the bottom of the meter just above where it says WARNING, maybe I could cut the back case half thereBonus, I only have to undo two screws to the back off

author: Brumby
author_rank: Unknown
timestamp: August 10, 2018, 02:13:04 am
content: .... and as if once wasn't enough:But what it took togetto that state...!
That scene in '2 Fast 2 Furious' - Page 1
Forum section: electronics / general

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: August 03, 2018, 05:06:21 pm
content: So, I was watching a 'Everything Wrong with' video by cinema sins on youtube, this time about the movie '2 Fast 2 Furious'. In that movie, there is a scene where the camera 'flys' through the car and at one point focuses on a PCB (spoiler: to illustrate that the car is being tracked by the FBI, because everyone here knows a flashing red light on a pcb = cops are after you).What I did notice, however, is that every device on that PCB scene is a legitimate chip and while I can't read all part numbers with youtube compression, I suspect on the real movie you will be able to (I've spotted national semi, intel, I think BB, TI), and all of them are in (almost) the right packaging too. I thought this was interesting enough to warrant sharing here.Video at timestamp I'm talking about:https://youtu.be/WBwVuP756XU?t=403

author: mariush
author_rank: Super Contributor
timestamp: August 03, 2018, 06:21:26 pm
content: Looks to me like a regular computer motherboard, but from the times when ISA slots were still a thing (long black connectors on the left). Maybe a Socket 7 motherboard at best (pentium mmx , amd k6)You can see the ribbon cable of floppy disk or ide40 hdd in the picture... but they took some ISA cards (maybe sound card or ethernet and just placed them vertically with the connector on the side to make the whole thing more complex - the isa cards are just floating unconnected to anything on the right side of the image.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 03, 2018, 06:22:56 pm
content: Playing the youtube link frame by frame (pause the video then press ',' or '.' to advance one frame at a time, backward or forward) doesn't look to be a real device, one PCB is just floating disconnected in mid air.

author: james_s
author_rank: Super Contributor
timestamp: August 08, 2018, 11:09:45 pm
content: This is pretty typical of movies, prop artists cobble together stuff they think looks "high tech" and more often than not it looks laughably absurd to anyone who has any clue, which is probably not the target audience of such a dumb movie.

author: helius
author_rank: Super Contributor
timestamp: August 08, 2018, 11:21:05 pm
content: Those are not props; the entire sequence is CGI.

author: james_s
author_rank: Super Contributor
timestamp: August 08, 2018, 11:30:16 pm
content: Well props or CGI it's pretty much the same. With physical props someone will stick together stuff that looks high tech. For CGI an artist will stick together images to achieve the look they're after.
Ford brings 'exosuits' to workers in 15 factories - Page 1
Forum section: electronics / general

author: chris_leyson
author_rank: Super Contributor
timestamp: August 07, 2018, 09:08:50 pm
content: https://www.bbc.co.uk/news/technology-45097046Good to see companies useing exosuits in the workplace. This'll be interesting. Now all I want is may exoglove PnP

author: james_s
author_rank: Super Contributor
timestamp: August 07, 2018, 09:32:58 pm
content: Any bets on how many minutes it will take before they start having medieval battles or mechwarrior jousting or something?

author: senso
author_rank: Frequent Contributor
timestamp: August 07, 2018, 09:36:14 pm
content: VW/Audi and BMW also use them.And I think its VW that also as a powered one that allows the worker to lift heavier objects, or maybe that was from Toyota?https://www.topspeed.com/cars/car-news/audi-introduces-exoskeleton-suit-in-its-production-facilities-ar178919.html
shopping for the 121GD multimeter - Page 1
Forum section: electronics / general

author: Sac
author_rank: Contributor
timestamp: August 07, 2018, 01:04:50 am
content: YoI'm having difficulty adding the 121GD multi meter to my basket on the online store..... There's no Add to card button... any ideas?ChrSnow

author: ANTALIFE
author_rank: Frequent Contributor
timestamp: August 07, 2018, 02:47:31 am
content: Looks like 121GW is out of stock m8

author: Sac
author_rank: Contributor
timestamp: August 07, 2018, 07:34:19 pm
content: Really?..... Just when I wanted to up grade
Breathing all the Noble Gasses - Cody'sLab - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: August 05, 2018, 08:18:49 am
content: Heh. But he hasn't done all possible noble gasses. He left out Helium-3.That would certainly be the most expensive Donald Duck impression ever.When I discovered that I have a cylinder containing two liters of He3, the thought of doing this crossed my mind.But no...http://everist.org/spacejunk/sell/helium-3.htm

author: SeanB
author_rank: Super Contributor
timestamp: August 05, 2018, 10:57:25 am
content: Quote from: TerraHertz on August 05, 2018, 08:18:49 amYou could go to the Moon and back on that.......

author: newbrain
author_rank: Super Contributor
timestamp: August 05, 2018, 03:50:44 pm
content: Quote from: SeanB on August 05, 2018, 10:57:25 am

author: TerraHertz
author_rank: Super Contributor
timestamp: August 08, 2018, 01:35:35 am
content: It's been a long wait for another laugh as good as Iron Sky.But seriously, all that 'let's mine the Moon for Helium-3' stuff is insanely stupid. So is all fusion power generation research that assumes availability of Helium-3, oranyof the rare light isotopes.Hydrogen or bust. Specifically, our technological civilization bust.

author: RoGeorge
author_rank: Super Contributor
timestamp: August 08, 2018, 05:48:37 am
content: ROFL, no wonder he refuse to sign the EULA, everybody does!Can hardly wait for Iron Sky 2
Katsu 852D (the wee blue unit). A great wee station for 45 quid!  - Page 1
Forum section: electronics / general

author: Terry01
author_rank: Frequent Contributor
timestamp: August 07, 2018, 02:50:52 pm
content: I have been taking apart an old TV for the last week or so, right down to component level. So when I say "apart" I mean "A P A R T"!I find it very relaxing and therapeutic and it also gives me loads of practise soldering/de-soldering different components and I find it is a very good way to get examples of how and why components are set out the way they are. It also lets me see lots of different ways of getting power around a circuit and the different methods of making things work. Taking a tv apart is my strange way of learning but it works best for me.I use an fx-888 for soldering iron work and a Katsu 852D for hot air stuff so I manage to get by ok. The Katsu unit also has a copy Hakko soldering iron along with the hot air which I sometimes use as a second iron when required. The board I was working on required me to use both iron and the hot air together to get all the components off it.I used the Katsu iron for a change which was a pleasant surprise as I usually just use the 888 for iron work. The 888 defo has more punch when needed and feels more solid to hold in your hand but the Katsu(copy) iron does ok for what it is.
[Book] Electric Machinery ---- A. E. Fitzgerald - Page 1
Forum section: electronics / general

author: pedro10vitor
author_rank: Newbie
timestamp: August 07, 2018, 07:06:54 am
content: Hi everyone, I am looking to buy a gift for a friend but I am quite unsure about the true name of the book. He has all the editions of the "Electric Machinery" writen by Fitzgerald and Kingsley, except by the first one, so it would be nice if I could gift it to him. THe problem is, the names changed along the way and I am not sure the ones I did find are the right ones. THe name is:"Electric Machinery: An Integrated Treatment of A-C and D-C Machines", published in 1952;The publisher is the same, Mcgraw Hill, the dates check, but I am just unsure. If someone could help me here, pointing if this is indeed the book I am looking for I would apreciate. Thanks.Ps.: from the fourth edition onwards Stephen D. Umans is intruduced as well.

author: woodchips
author_rank: Frequent Contributor
timestamp: August 07, 2018, 01:10:28 pm
content: Two 1952 editions on ABEbooks, at wildly different prices.