hybridfree/eevblog-posts huggingface dataset:
New 9V alkaline battery at 9.6V? Used to be ~9.3V - Page 1
Forum section: electronics / general

author: jolshefsky
author_rank: Regular Contributor
timestamp: July 20, 2018, 03:19:17 pm
content: I was wondering if anybody knows why Duracell ProCell alkaline 9V batteries have a higher voltage now? I've been buying them for the better part of 10 years and for all that time, every single one had a new voltage of 9.20-9.35V (in circuit, light load ~20mA). The last pack I got had a different shape and the voltage on each one was around 9.6V. Is there a new alkaline technology around?

author: Zero999
author_rank: Super Contributor
timestamp: July 20, 2018, 03:31:42 pm
content: Pot luck?9.6V seems like a reasonable voltage, which is 1.6V per cell.Could it be the ambient temperature at the moment? I've heard it's quite hot in many parts of the US, at the moment, as it is in Europe: there's one massive heatwave going on in the northern hemisphere!

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 20, 2018, 04:22:06 pm
content: We'll have to compensate for higher battery voltages due to global warming.

author: alank2
author_rank: Super Contributor
timestamp: July 20, 2018, 04:27:26 pm
content: Fresh Duracells are almost always 1.64-ish V which *6 is 9.84V. Could the 9V you used before have been older? Maybe some procells were aged ones?

author: BrianHG
author_rank: Super Contributor
timestamp: July 20, 2018, 05:04:19 pm
content: Just read the datasheet:https://d2ei442zrkqy2u.cloudfront.net/wp-content/uploads/2016/03/PC1604US12141.pdfLoot at the last graph, as the temperature rises, 9.8v at room temp, could be as much as 10v on a hot day.Look at the speed that that voltage drops to a normal value, just leave the battery sitting on the shelf and this top voltage will drop over time.

author: BrianHG
author_rank: Super Contributor
timestamp: July 20, 2018, 05:10:02 pm
content: And no, there is not a new alkaline technology. In fact, all the duracell types are bogus, they are all basically the same no matter what the advertisers and prices might lead you to believe.Even the Quantum datasheets are bogus. The modified the vertical axis scale compared to their other data sheets to make it look like the battery has a lower impedance, but, convert the scales, and zoom into the .pdf and notice the photo-shopped painted in line over the original screenshot measured line from the measuring instruments and it turns out the double priced quantum batteries are identical to the regular cheap duracell coppertop versions.Energizer does the same BS, only the lithium AAA batteries deal better with high current loads, or, very low temperature environments. But in low current room temperature applications, Alkaline actually outperforms the lithium.
Impacts to soldering iron tips - Page 1
Forum section: electronics / general

author: Raj
author_rank: Frequent Contributor
timestamp: July 20, 2018, 08:51:37 am
content: Does impacts,even small ones like while sliding in and out of holder, really damage the tips?Cause I herd it somewhere and went on to make a magnetic base for my iron...(even if it doesn't, this one is quickest to take the iron onto and off of.https://www.instructables.com/id/Magnetic-Soldering-Iron-Stand/

author: Zucca
author_rank: Unknown
timestamp: July 20, 2018, 12:13:25 pm
content: Quote from: Raj on July 20, 2018, 08:51:37 amIn theory: no in the short term, yes in the long one.What damage the tip is not the small impact but the small scratch left on the tip by the impact.Instead of the acrobatic magnetic iron holder, buy one made by a no scratching (no metal) material.Look how Metcal, Hakko design their holders.
What happened to EEVBLOG #1105 LCD DC Bias experiment results - Page 1
Forum section: electronics / general

author: ignator
author_rank: Regular Contributor
timestamp: July 16, 2018, 06:59:21 pm
content: I watched the video, was trying to comment, but this failed. On reload, the video was removed by the user.Did Dave find a loose connection that resulted in failed segments?

author: station240
author_rank: Unknown
timestamp: July 17, 2018, 03:16:52 pm
content: Quote from: ignator on July 16, 2018, 06:59:21 pmYes

author: BrianHG
author_rank: Super Contributor
timestamp: July 17, 2018, 06:07:36 pm
content: Dave should check if there is any measurable impedance between the common and any of the segments in both polarities. They should all read above 100 mega-ohms if the LCD hasn't been damaged due to DC drive voltage. Otherwise, the LCD is actually damaged, however, the low impedance output of the MCU is strong enough to drive past the DC resistance, but now, a battery powered app will draw too much power.@Dave, please do a proper ultra high impedance test from the common to the segments in both polarities when measuring with your meter & report back. Also, one other test which might be too late to test is if the LCD turns on black at the same critical voltage threshold as a fresh new or AC driven LCD.

author: exe
author_rank: Unknown
timestamp: July 19, 2018, 07:37:17 pm
content: One of the most anticipated videos by me...
74LVC1G vs: 2G ?? - Page 1
Forum section: electronics / general

author: GreggD
author_rank: Regular Contributor
timestamp: July 17, 2018, 02:27:56 pm
content: I am missing something simple.What is the difference between a SN74LVC1G74DCUR and SN74LVC2G74DCUR ?I thought 1G was one gate and 2G was two but it is not.

author: GreggD
author_rank: Regular Contributor
timestamp: July 17, 2018, 03:46:51 pm
content: Not the answer andI need the xxx74 as it has RESET (CLR*)

author: Benta
author_rank: Super Contributor
timestamp: July 17, 2018, 04:33:50 pm
content: Your understanding the 1G is one function and 2G is two functions is correct. It seems TI messed up with the nomenclature at some point. The 2G datasheet is from 1999, where the 1Q datasheet is from 2009.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 19, 2018, 05:38:28 pm
content: Comparing both datasheets, it seems the 2G variant was a bit more thoroughly characterized over the operating temperature range of -40 to +125°C. although they did not push it to 200MHz at this range (the 1G is shown results at that frequency and temp range).Overall, the parts are functionally identical.
Dontronics is gone - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 19, 2018, 06:12:35 am
content: Dontronics is no more.A pioneering one-man-band Australian online electronics parts retailer.https://www.dontronics.com/

author: DerekG
author_rank: Frequent Contributor
timestamp: July 19, 2018, 06:52:37 am
content: Yes, the end of an era. Quite sad really........... If only he had sons rather than daughters ..................

author: aargee
author_rank: Frequent Contributor
timestamp: July 19, 2018, 06:55:14 am
content: We could have a big discussion about online shopping, China, etc etc...but for me it's - thanks Don for those years.and really? Sons rather than daughters? His 'sons' probably would be running the same online businesses as his daughters.

author: Zero999
author_rank: Super Contributor
timestamp: July 19, 2018, 07:50:07 am
content: Quote from: aargee on July 19, 2018, 06:55:14 amHe has a point that boys are more likely to do something like run an on-line electronics business, than girls, but it's also true they probably wouldn't be interested. I certainly wouldn't be interested. The margins are slim and it seems like a really boring job.

author: CJay
author_rank: Super Contributor
timestamp: July 19, 2018, 07:53:05 am
content: Fair play to him, shame there was nobody to pass the mantle on to but if he's 'comfortable' enough to be able to retire I figure he deserves it at 75, I wish him a long and happy retirement and I have a feeling he will continue to tinker for himself.
Lightning strikes correlate with the spinning Sun - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: July 19, 2018, 02:57:28 am
content: http://joannenova.com.au/2018/07/lightning-strikes-occur-in-time-with-the-spinning-sun-in-150-year-old-japanese-farm-records/#more-59651Lightning strikes occur in time with the spinning Sun in 150 year old Japanese farm records"Our understanding of the sun’s effect of Earth’s weather is so immature" - indeed.
Nonstandard input voltages into 100-240V PC PSUs? - Page 1
Forum section: electronics / general

author: lpc32
author_rank: Frequent Contributor
timestamp: July 17, 2018, 07:48:25 pm
content: Can PC PSUs work equally well (ignoring efficiency) with any input voltage in their range?

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 17, 2018, 08:32:51 pm
content: Apart from the 100-240V AC they're rated for, most will also work with 140-380V DC.

author: SeanB
author_rank: Super Contributor
timestamp: July 17, 2018, 09:21:45 pm
content: Aside from those with SCR switching of voltage range ( pretty rare these days aside from some really old designs) most will work fine anywhere in the input voltage range at full load, and often will be comfortable at part load at lower input voltages as well.

author: David Hess
author_rank: Super Contributor
timestamp: July 18, 2018, 02:09:45 pm
content: If the power supply says 100 to 240 VAC, then it often has an active power factor correction input stage and should work with any AC voltage within that range. The problem is with power supplies that use a switchable voltage doubler input stage which only works between say 90 to 140 and 180 to 280 but are marked "universal input" or 100 to 240 VAC.Most universal input power supplies will also work with a DC input voltage which is the peak of the designed AC voltage so between 170 and 340 volts DC.

author: Ian.M
author_rank: Super Contributor
timestamp: July 18, 2018, 03:05:55 pm
content: Yes, the old SMPSUs with SCR switched voltage doublers were notorious for blowing up when powered from 230V, if either there was a severe prolonged brownout, or if the input voltage detection circuit became faulty. The usual repair (if they couldn't simply be replaced) was to rebuild them for nominally 230V only, removing the doubler switching circuit.

author: lpc32
author_rank: Frequent Contributor
timestamp: July 18, 2018, 11:22:40 pm
content: I assumed it's either manual 115/230V selection (or fixed), or active PFC.How common were auto-switching ones? Any specific manufactures known to be fond of them?Though, if it's as wide as 90-140V and 180-280V, that's something too.
Detecting and mounting a file system of a flash chip. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: July 18, 2018, 08:23:01 am
content: When reading a flash chip with an external programmer, is there a way to detect the presence of a file system?I triedCode:file name.binname.bin: dataAlexander.

author: Halcyon
author_rank: Unknown
timestamp: July 18, 2018, 09:40:21 am
content: I guess the easiest way I can think of would be to throw the output into a hex editor and have a look at the first few bytes.

author: tsman
author_rank: Frequent Contributor
timestamp: July 18, 2018, 10:55:33 am
content: Usebinwalk. The file command only checks whatever is at the start of the file so if there are any headers or other data then it won't find anything located further in.

author: firewalker
author_rank: Super Contributor
timestamp: July 18, 2018, 11:25:16 am
content: Thanks you!!!Alexander.
slimware utilities windows driver advertising - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: July 19, 2018, 11:25:19 am
content: windows driver update advertisingis slimware utilities legitimate microsoft windows or a scam?has anyone used this? what its it? malware? ransomware?what is slimware utilities business model? as they paying for advertising.

author: amyk
author_rank: Super Contributor
timestamp: July 19, 2018, 12:07:30 pm
content: Everything like that is almost certainly a scam.

author: janoc
author_rank: Super Contributor
timestamp: July 19, 2018, 12:38:51 pm
content: Yep. "Update missing drivers" is an oxymoron to boot (can't update what is not installed).These "driver update" tools, "registry maintenance" utilities and similar are for the most part useless crap that only loads your machine with bundled adware and various time-limited crippleware, in the worst case it is malware.Unless the utility is directly from Microsoft or the vendor of your motherboard, stay away.Why don't you just google the thing? Slimware is a scam (scareware - aka trying to scare you about non-existent problems and extract money from you for "fixing" them):http://botcrawl.com/remove-driver-update-virus/

author: BravoV
author_rank: Super Contributor
timestamp: July 19, 2018, 12:39:09 pm
content: Assuming no ransomware, that is another great way to make your rig their digital currency miner, best part is you installed it willingly.

author: Halcyon
author_rank: Unknown
timestamp: July 19, 2018, 08:41:31 pm
content: Yes, it's a scam. Those "driver" advertisements are just a newer, sleeker version of the old, crude flashing "you're computer is infected" banner ads that try to get you to download "antivirus". Unless you know what you're doing,neverdownload drivers from anywhere apart from the device manufacturer and do not download anything that claims to be a "download manager" to enable to you download a driver. They are bullshit.It's the equivalent of going down to an auto-parts store and buying oil and an air filter, but also handing over a copy of your car key to the sales person just because they asked.

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 19, 2018, 08:58:07 pm
content: I think installing some of the lowest level software there is on a system from unknown sources is an excellent idea that can only lead to improved performance.

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 20, 2018, 01:37:54 am
content: Step 1: Install "DriverUpdate"Step 2: ScanStep 3: Can't proceed because entire screen has turned into Nyan Cat.
Chemical reaction between Solder and battery Alkaline? - Page 1
Forum section: electronics / general

author: Retromat
author_rank: Contributor
timestamp: July 17, 2018, 08:25:56 am
content: Greetings everyone!as i posted here:https://www.eevblog.com/forum/vintage-computing/retro-repair-repairing-a-leaked-battery-in-the-amiga-2000-and-more/our battery liquid spreaded on soldering joints over years turning them into some strange alloy and i wondered of someone with enought chemical knowledge wouldknow in what they turned into as they seemed to be resistant to any applicationf of heat.Thanks in Advance!

author: Stray Electron
author_rank: Super Contributor
timestamp: July 17, 2018, 09:24:03 pm
content: I don't think you're dealing with a changing alloy but with changing chemical compound(s) that has a higher melting point(s). I think the electrolyte in Ni-Cd batteries is mostly potassium hydroxide. I'm not certain of the chemistry but it seems likely that it is reacting with the copper and tin and forming copper and tin oxides and with co2 in the atmosphere and forming copper and tin carbonates (hence the vivid blue and green colors). Copper will also form double salts so it could be forming a copper-potasium carbonate.They sell a product here in the US that's made for cleaning sinks and showers called 'Lime-Away'. it's mostly phosphoric acid. It's the best thing that I've found to remove the corrosion with. However as you pointed out, the remaining alloy is difficult to solder to. The best way that I've found to deal with it is to melt more solder on top of it and it will usually melt the old alloy and mix with it and make it somewhat workable. However once the two are melted and fused together I usually use a solder sucker to remove all of the mix and then resolder with new solder.
Solar Voltage Drop. - Page 1
Forum section: electronics / general

author: mmpaaker
author_rank: Newbie
timestamp: July 17, 2018, 07:27:39 am
content: Hi,i have a 100w solar panel and 100A Lead acid battery. with 20a solar controller. i was using it around year no any problem. now aim getting problem battery not charging.i just remove all cables and check the voltage on solar its giving me 20.6 volt and very sunny time. once i connect the battery to the controller or direct to solar wire. voltage is drop 50% it show 10.3v without any load.how to solve this problem?

author: PlainName
author_rank: Super Contributor
timestamp: July 17, 2018, 07:57:11 am
content: The controller is probably doing MPPT so it would be worthwhile checking what current is being sucked out as well as the voltage. Could be a short on the output causing the problem.
Best equipment tear down ever. - Page 1
Forum section: electronics / general

author: GeoffreyF
author_rank: Regular Contributor
timestamp: July 16, 2018, 02:25:02 pm
content: HAL 9000 in the parts bin now.

author: German_EE
author_rank: Super Contributor
timestamp: July 16, 2018, 04:29:01 pm
content: Douglas Raine who did the voice over work for HAL was told by Kubrick to sound as relaxed as possible. He therefore wore his favorite slippers, smoked his pipe and put his feet up on the desk whilst working

author: station240
author_rank: Unknown
timestamp: July 17, 2018, 03:52:08 pm
content: Still waiting on component level repair and debugging videoOr perhaps it's just beyond economic repair.
Walabot - see through walls with Android -has anyone used one? - Page 1
Forum section: electronics / general

author: ez24
author_rank: Super Contributor
timestamp: January 07, 2018, 08:59:09 pm
content: From a YT ad:https://walabot.com/diyhttps://www.bhphotovideo.com/bnh/controller/home?A=details&O=&Q=&ap=y&c3api=1876%2C%7Bcreative%7D%2C%7Bkeyword%7D&gclid=Cj0KCQiAp8fSBRCUARIsABPL6JbXuydK3XDpz55D2Kg5PO8iIiQTNf2aWwUX7hVClZHr1eh2y0fdWtkaAst0EALw_wcB&is=REG&m=Y&sku=1316577Has anyone used one of these? How do these work?

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 07, 2018, 09:50:19 pm
content: Quote from: ez24 on January 07, 2018, 08:59:09 pmThe same way regular digital stud finders work. It's probably using some form of radar.

author: ez24
author_rank: Super Contributor
timestamp: January 07, 2018, 09:56:37 pm
content: I wonder if it could be using something like this:https://www.aliexpress.com/item/Free-Shipping-Human-body-induction-module-RCWL-0516-microwave-radar-inductive-switch-module-intelligent-sensing-detector/32712700620.htmlA 49 cent radar detector ?

author: Nusa
author_rank: Super Contributor
timestamp: January 07, 2018, 10:04:44 pm
content: I think it's just a low-end thermal camera combined with some image processing to make guesses about what things are.

author: Cyberdragon
author_rank: Super Contributor
timestamp: January 07, 2018, 10:31:56 pm
content: Quote from: Nusa on January 07, 2018, 10:04:44 pmNo, definitely not. That would only find pipes. This is a full blown stud finder. Plus it's too close to the wall and has no lens.

author: Bud
author_rank: Super Contributor
timestamp: January 07, 2018, 10:50:19 pm
content: It had already been discussed in a other thread, search for Walabot on this forum. It uses a GHz planar antenna array.

author: Nusa
author_rank: Super Contributor
timestamp: January 08, 2018, 01:38:53 am
content: Quote from: Cyberdragon on January 07, 2018, 10:31:56 pmI may be wrong about the technology used in this case, but you're also incorrect. Thermal cameras work pretty well as stud finders.

author: ChunkyPastaSauce
author_rank: Unknown
timestamp: January 08, 2018, 02:04:33 am
content: https://www.bdti.com/InsideDSP/2016/10/11/Vayyarhttps://www.google.com/search?tbo=p&tbm=pts&hl=en&q=inassignee:%22Vayyar+Imaging+Ltd%22

author: Bud
author_rank: Super Contributor
timestamp: January 08, 2018, 03:07:32 am
content: As far as I understand it is the same technology used for hostage/urban rescue. The secret sauce is in the software. I think Walabot and their dev kit is a bonanza for experimenting in this area, but TX power would need to be pumped up a bit and antenna array may need a rework. But the platform is there.

author: hendorog
author_rank: Super Contributor
timestamp: July 17, 2018, 06:27:21 am
content: I got one of these on the spur of the moment as it seemed cheap for what it is and on a gamble that it is hackable.As a stud finder it is a complete and utter disaster. Avoid at all costs if you actually want to use it for that.I really hope their open API stuff works with the DIY version...
Genesys system for TX-2 - MIT's Lincoln Laboratory 1967 - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: July 16, 2018, 04:41:16 pm
content: You would be surprised how much work went on at MIT Lincoln Lab, they were the people responsible for inventing inertial guidance and then later on applying this work in the Apollo guidance computer.

author: In Vacuo Veritas
author_rank: Frequent Contributor
timestamp: July 16, 2018, 04:59:49 pm
content: Quote from: German_EE on July 16, 2018, 04:41:16 pmAs a German EE, do you not know that was done on the V-2?

author: German_EE
author_rank: Super Contributor
timestamp: July 16, 2018, 06:45:20 pm
content: OK, if we want to be pedantic about this, Von Braun and his scientists came up with the first INS towards the end of WWII. It was however amazingly innacurate and certainly not good enough for point to point navigation. On the first flight of the Lincoln Labs instrument they managed to fly across the continental USA and their error on arrival was only 150m.I would not want to go to the moon using a Von Braun system for navigation.
Get a framed piece of Stuart Ashen's brown sofa! - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: July 13, 2018, 10:51:21 am
content: No, this is not spam. For those who follow Ashens on YouTube, you'll no doubt know about the new movie he and his crew are crowd funding.When initially launched, collectible framed bits of his brown sofa sold-out very quickly, but it seems as though he has more! Maybe he has chopped up his other sofa? Who knows?https://igg.me/at/ashens2

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 13, 2018, 02:54:15 pm
content: More bloody couch feet!

author: CopperCone
author_rank: Super Contributor
timestamp: July 15, 2018, 01:49:21 am
content: are you gonna clone him or some shit?
Bicycle quick detach project box - Page 1
Forum section: electronics / general

author: McMonster
author_rank: Frequent Contributor
timestamp: July 14, 2018, 05:22:18 pm
content: Hi, I'm looking for an idea for a quick detachable box for mounting some electronics on a bicycle. Needs to be able to stay in a more or less stable position. I've experimented with various screw-tightened camera mounts, but they are tedious to put on and off. And I've already broken multiple of those by tightening them barely enough to keep just the camera stable.It'll problably be a one-off project for me and maybe some of my friends, so it's ok if it needs some hacking to adapt. But if there is something that can easily reproducible in larger numbers then I'm also interested.

author: Twoflower
author_rank: Frequent Contributor
timestamp: July 14, 2018, 07:23:22 pm
content: I think you should be more specific. What weight and size we're talking about? Where should it be mounted?The first idea I had was something like the holder part of this:https://www.ortlieb.com/wp-content/themes/ortlieb-theme/pdf/anleit/ultimate6.pdfwith a 3D printed counterpart.

author: McMonster
author_rank: Frequent Contributor
timestamp: July 14, 2018, 07:40:56 pm
content: Not much, probably the size of a larger handheld multimeter and below 0.5 kg in weight. As for mounting place, preferably on the handlebar, but anywhere in the front of a bike would be fine.

author: Twoflower
author_rank: Frequent Contributor
timestamp: July 14, 2018, 07:58:48 pm
content: The holder from Ortlieb I posted earlier matches the position, can handle up to 5kg and extremely durable. I'm using that thing and never faced problems and it stays in position. The holder cost 20€ and issold separately. But there are most likely cheaper solutions similar to that one. If you scarify a decent quality bike basket you might get the both parts (holder and detachable part) together for little money.If you think ybout the Ortlieb part. Look at thepictureyou can see that the counterpart could be made very simple. One bar to grab behind the upper claws of the holder. And for the lower part a bend steel wire to latch into the grey snapper in the lower part (it opens if you press the key down). And as a plus: You can lock it, still the lock isn't very good.If you like I can post a picture of the part that grabs on to that holder.

author: McMonster
author_rank: Frequent Contributor
timestamp: July 14, 2018, 08:20:01 pm
content: Thanks, it looks to be a good concept. I'll order a cheaper alternative and see if it works well.
help me to find the Parts - Page 1
Forum section: electronics / general

author: mmpaaker
author_rank: Newbie
timestamp: July 09, 2018, 08:16:20 am
content: Hi all.This is my first post on this forum and i don't know i have post it on correct correct section.here is my problem. i have a 300w chinese 12v to 220volt invertor it was work fine recently its not working, once i open it i fount 2 transistors was burned and the parts number was erased on it. anyone know about this part number please let me know.( here some pics about my invertor i found it on google on a russian forum)there are Main 4 Transistor on it (IRF830)in the PCB i found SS4958 is written.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 09, 2018, 03:22:38 pm
content: If that's the low voltage side (no idea why they're labeled IGBTs), IRF3205 is a common part.

author: Lionered
author_rank: Contributor
timestamp: July 09, 2018, 06:01:06 pm
content: That's quite hard to guess but I think if you bring it to parts suppliers, they'll be able to identify it fast. They could also base it on the specification of other parts to ensure its compatibility. good luck, hope it will work!

author: mmpaaker
author_rank: Newbie
timestamp: July 10, 2018, 03:48:01 am
content: HiThanks for your reply. and in the board other end it has IRF830 4 pcs. for output voltage.and yes this is for low voltage side ( 12Volt directly connect to it)i have drew the connection how it goes.may be you can find it.

author: mmpaaker
author_rank: Newbie
timestamp: July 10, 2018, 03:49:15 am
content: Quote from: Lionered on July 09, 2018, 06:01:06 pmi have try it with many parts suppliers they don't have idea about it.

author: mmpaaker
author_rank: Newbie
timestamp: July 11, 2018, 08:40:31 am
content: Anyone know about these components?

author: mmpaaker
author_rank: Newbie
timestamp: July 14, 2018, 06:14:45 pm
content: Quote from: NiHaoMike on July 09, 2018, 03:22:38 pmHi,i try with IRF3205 but no luck.
What is the length twisted pair WIRE versus cable LENGTH? - Page 1
Forum section: electronics / general

author: Holes Flow
author_rank: Contributor
timestamp: July 16, 2018, 09:56:32 pm
content: Experts,In making calculations for lengths of twisted pair, there is the length of the cable itself, and based on the standard a tight or loose pitch, a different wire foot exists for every cable foot. See attached for differences in wire used per cable foot.And yes, while I understand the slight differences in pitch between pairs for interference/performance reasons, I'm looking for values good enough to use in TDR calculations, so averages of all 4 pairs are fine. I'm thinking just CAT5/e and CAT6. Maybe I've lost my Google-Fu, but all searches bring up are questions about what the max cable run can be with CATx. And I'm still uncertain about 22/24/26 AWG being different within a CAT spec.Thanks for any pointers!

author: rstofer
author_rank: Super Contributor
timestamp: July 16, 2018, 10:28:06 pm
content: The manufacturer's datasheet will give you Velocity of Propagation as a percentage - typically 70% for network cable.http://www.te.com/content/dam/te-com/documents/channel/marketing-materials/cat6a-ecard.pdfhttps://catalog.belden.com/techdata/EN/1227A1_techdata.pdfThat VoP is exactly the number to dial in to the TDR (at least the one I had).A lot of folks build a fast rise time pulse generator and do TDR measurements with a scope. You have to lay the wire out on the ground, it can't be left spooled. Measure 100' and see what you get - it will probably be on the order of 1.5 ns per foot. You can search around here for such a pulse generator. There is a project in one of these forums.w2aew has a project:

author: Holes Flow
author_rank: Contributor
timestamp: July 17, 2018, 01:42:15 am
content: @rstofer,Thanks for writing. I was actually looking for documentation or a reference that explains the relationship between actually length of wire in the various STP/UTP specs with relationship to the length of the cable the TP is in.For example, it if takes 13" of 24ga wire to make a single 12" of cable, that ratio. Pitch has a lot to do with it, but so the insulation thickness, most all of the specs being defined in the specs for CATx.These values don't matter at all for small lengths, but with a line driver at, say 30mA at 5V, the difference between physical and electrical length start to add up. And different CATx specs specify different twist pitches.

author: chris_leyson
author_rank: Super Contributor
timestamp: July 17, 2018, 02:55:33 am
content: Essentially you need to calculate the length of a helix to get overall wire length. You just need to know the pitch of the helix, which is also known as cable lay length, and the diameter of the helix which is just the diameter of the wire for simple twisted pair. Good explanation on page 7 "http://www.nexans.com/France/group/doc/en/General.pdf". For example, if I have 1mm diameter wire and a pitch or lay length of 10mm then the overall wire length works out to be 10.48mm.
Time to clone Dave's vocal ? - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: July 13, 2018, 10:00:29 am
content: No affiliation, just knew this, its quite scarry imo ->https://lyrebird.ai/vocal-avatarThe Trump & Obama's cloned vocals are very convincing, at least to my ears.Voice is artificially generated.https://youtu.be/EFHyzuqjaokVoice "and video" too ...https://youtu.be/YfU_sWHT8mo

author: In Vacuo Veritas
author_rank: Frequent Contributor
timestamp: July 13, 2018, 02:23:28 pm
content: The first video does not contain an artificial voice and I have no idea why you'd think that, and the second video's audio is so obviously synthesized it's painful.

author: EEVblog
author_rank: Unknown
timestamp: July 13, 2018, 02:43:57 pm
content: I wonder whatever happened to that (Garmin?) GPS voice I made once?

author: jh15
author_rank: Frequent Contributor
timestamp: July 14, 2018, 02:59:30 am
content: I hope his real voice doesn't decline to vocal-fry. This is the square wave sound mostly from millenials now. Opposite of a melodious voice.It should not be mistaken with his sometimes gargling voice while in a thinking/speaking mode. that is OK.

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 14, 2018, 04:37:16 am
content: It's pretty obvious that somewhere in the next 20 years audio and associated video are as easily faked as glamour photos are now. The era of seeing is believing is coming to an end and we'll have to figure out how we relate to the real and fake footage bombarding us.The transition might be painful though, as people may be slow to catch on that they're not getting a truthful picture. We already see that happening in other areas today.
Levitating DIAMONDS with a laser beam!! - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: July 13, 2018, 08:33:14 pm
content: I had absolutely no clue this was possible with mere scrap junk I have lying around my basement...I mean, it is a literal tractor beam for diamonds...

author: CopperCone
author_rank: Super Contributor
timestamp: July 13, 2018, 10:20:54 pm
content: I heard of doing this but ifigured you needed some kind of crazy control system or something, its like levitating a ping pong ball on an air stream

author: BrianHG
author_rank: Super Contributor
timestamp: July 13, 2018, 10:34:28 pm
content: Quote from: CopperCone on July 13, 2018, 10:20:54 pmYup, except it works horizontally as well as vertically up and down.
High-Energy 'Ghost Particle' Traced to Distant Galaxy in Astronomy Breakthrough - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: July 13, 2018, 12:20:19 am
content: https://www.space.com/41146-neutrino-source-blazar-cosmic-rays.html

author: tautech
author_rank: Super Contributor
timestamp: July 13, 2018, 01:27:09 am
content: Shame Stephen Hawking wasn't here to see it.

author: BravoV
author_rank: Super Contributor
timestamp: July 13, 2018, 04:56:08 am
content: Really curious what kind of components used in these modules to withstand the cold, I guess the design needs much less heatsink.Sensor modules buried under the ice.

author: a59d1
author_rank: Regular Contributor
timestamp: July 13, 2018, 05:08:02 am
content: Quote from: BravoV on July 13, 2018, 04:56:08 amThis has a lot of great details:https://spectrum.ieee.org/aerospace/astrophysics/icecube-the-polar-particle-hunter

author: BravoV
author_rank: Super Contributor
timestamp: July 13, 2018, 05:12:56 am
content: Quote from: a59d1 on July 13, 2018, 05:08:02 amThanks ! Quoting -> "Each module also has to use less than 5 watts of power" , seems like no need to worry about heat sinking at all eh ?
Digi-Key customers targeted with virus e-mails - Page 1
Forum section: electronics / general

author: Werecow
author_rank: Newbie
timestamp: July 12, 2018, 06:43:39 pm
content: Just a heads-up:My company received an email message today claiming to be from "Digi-Key Electronics Account", although the miscreants didn't bother spoofing to show originating from the digikey domain. Text of e-mail message is:Sir,My boss called your office today but no response. Attached is the Payment Voucher. Please confirm account details before we proceed to make payment.Sincerely,Ms Vic DanielAccount OfficerDigi-Key Electronics701 Brooks Ave., SouthP. O. Box 677Thief River Falls, Minnesota 56701United States of AmericaPhone : +1-800-344-4539Fax : +1-218-681-3380Website :http://www.digikey.com/en/supplier-centers/m/microchip-technologyAttachment is an xlsx file -- Kaspersky says,Scan resultFile is infectedDetected threatsHEUR:Exploit.MSOffice.GenericFile size13.59 KBFile typeOOXML/DOCUMENTScan dateJul 12 2018 14:33:43Databases release dateJul 12 2018 17:36:11 UTCMD5eb84b26936ccf1a5b017a6ca55772b04SHA1abf6f22eb7db912836d3103551079339903b6817SHA25656d7ecb835529bf4ed52b471ac20b62b3a8046368897cd71c48029a2f3f16108
LLNL releases newly declassified test videos - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: July 09, 2018, 07:45:43 pm
content: https://www.llnl.gov/news/llnl-releases-newly-declassified-test-videosLLNL YouTube Channelhttps://www.youtube.com/user/LivermoreLab/videos

author: CatalinaWOW
author_rank: Super Contributor
timestamp: July 09, 2018, 09:17:23 pm
content: It is an interesting sign of the times that a 20-30% error is regarded as huge. I am sure that those who did the original analysis were aware of error margins and were backslapping themselves for being able to get that close.A similar time change in accuracy standards is seen in the volt nut and time nut threads. Back when these tests were performed we were still content measuring distance based on a couple of scratches on a platinum bar. Now we count wavelengths of a very well controlled light frequency, and are looking for more. And I still see survey stakes scattered over a couple of square meters all purporting to be the same corner of a property boundary.

author: TerraHertz
author_rank: Super Contributor
timestamp: July 12, 2018, 02:44:22 pm
content: Sure beats fireworks.annnnd... there went the whole evening in youtube wandering. Highlights:watch?v=xYemnKEKx0c Strange answers to the psychopath test | Jon Ronsonwatch?v=vsMydMDi3rI Frank Abagnale: "Catch Me If You Can" | Talks at Google. (Don't miss the last few minutes, re Trusona, and also vehicle remote control.)
Capacitor Price Fixing - Page 1
Forum section: electronics / general

author: R_Gtx
author_rank: Regular Contributor
timestamp: November 04, 2016, 02:13:09 pm
content: It seems that some reputable companies have been up to less than reputable practices:https://www.justice.gov/opa/pr/five-more-individuals-indicted-their-roles-capacitors-price-fixing-conspiracy

author: Tomorokoshi
author_rank: Super Contributor
timestamp: November 04, 2016, 08:12:19 pm
content: What worse:1. Somewhat overpriced capacitors that work from otherwise reputable Japanese companies.2. Guaranteed to fail capacitors made using counterfeit electrolyte that isn't made properly.Have they gone after CapXon / etc.?

author: vodka
author_rank: Frequent Contributor
timestamp: November 04, 2016, 08:32:43 pm
content: Quote from: AcHmed99 on November 04, 2016, 03:49:32 pmYou don't complain , here when the crude goes up and the gas hits a pick ,when the crude goes down and the gas follows to go up or leave stagnant but with few frequency it goes down

author: xygor
author_rank: Regular Contributor
timestamp: November 04, 2016, 09:39:59 pm
content: Were the fixed prices too high or were they too low?

author: Back2Volts
author_rank: Unknown
timestamp: November 05, 2016, 09:56:18 am
content: Quote from: xygor on November 04, 2016, 09:39:59 pm

author: mtdoc
author_rank: Super Contributor
timestamp: July 09, 2018, 06:08:52 pm
content: Are others getting these notices?I'm guessing I got one due to past Digikey purchases.Sure, I'll rush right out and register so I can jump through hoops to collect a few dollars.Looks like $15 million of the $34.5 million will go to the lawyers....

author: schmitt trigger
author_rank: Super Contributor
timestamp: July 09, 2018, 06:12:23 pm
content: More than collect a few dollars, they may send you some "replacement components".

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 09, 2018, 06:26:22 pm
content: Quote from: xygor on November 04, 2016, 09:39:59 pmToo high for the good stuff, too low for the junk that doesn't last.

author: calexanian
author_rank: Super Contributor
timestamp: July 12, 2018, 02:14:06 am
content: Nothing new. this is from a few years ago. Its even more rampant now, and with the 25% tariff you watch what will happen!

author: Cyberdragon
author_rank: Super Contributor
timestamp: July 12, 2018, 04:33:19 am
content: Quote from: calexanian on July 12, 2018, 02:14:06 amNo...we'll smell what will happen (crap cap smoke).
Can I get some help translating Italian into English? - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: July 12, 2018, 12:56:12 pm
content: I have a business card in Italian and I need to get the address off it. I'm not 100% sure I "get" what the address is; can anyone here help me?

author: bsfeechannel
author_rank: Super Contributor
timestamp: July 12, 2018, 01:22:20 pm
content: Mostraci l'indirizzo, per favore.

author: Ian.M
author_rank: Super Contributor
timestamp: July 12, 2018, 01:46:32 pm
content: Having some idea of what an Italian postal address should look like will help:http://bitboost.com/ref/international-address-formats/italy/

author: Zucca
author_rank: Unknown
timestamp: July 12, 2018, 02:05:35 pm
content: What happens if you type the address in google maps?Why it is so difficoult to read an address from a business card?

author: cvanc
author_rank: Frequent Contributor
timestamp: July 12, 2018, 02:11:12 pm
content: Thanks for the offers; I've (hopefully) sent a PM containing an image of the card. Please take a look for it and thank you again.
Electronics more accessible to the wider communities, engineers,hobbiest, makers - Page 1
Forum section: electronics / general

author: 240_JOLTS
author_rank: Newbie
timestamp: July 08, 2018, 01:55:34 pm
content: With the expansion of electronics to the masses e.g makers designers, engineers. Is it becoming more difficult to get a head of the game in terms of electronics product design.My observations is that:You certainly have to be creative but now it's becoming more important to have a deeper understanding of electronics application and physics in order to provide novel product technologies and techniques that stand out.Science and mathematics will become more importantIn electronics development what ever route you takeIf you looking for the advantage.Be interesting to see others comments on this.
maximum power rating - Page 1
Forum section: electronics / general

author: rckanta
author_rank: Contributor
timestamp: July 07, 2018, 05:15:34 am
content: what is the of this transformer?I take this transformer from computer ups( intex )

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 07, 2018, 06:04:36 am
content: 5 to 50W.You could've helped yourself out here, like by putting a ruler in the picture...Tim

author: Delta
author_rank: Super Contributor
timestamp: July 07, 2018, 06:22:06 am
content: 23.7 Volt Amperes.
Mouser crazy shipping costs - Page 1
Forum section: electronics / general

author: dfnr2
author_rank: Regular Contributor
timestamp: July 07, 2018, 10:58:12 pm
content: I'm just curious if anyone else experienced crazy shipping costs from Mouser this week.I placed an order for a few small parts, less than 1 kg total, and the shipping cost was over $30, for UPS ground in the same metropolitan area. Normally the cost is $7.99 for anything up to a couple of kg. Reducing qty of some small plastic items by 1 shaved off a $1-$2 depending on the item. Removing all the small parts and leaving only a small programmer resulted in the expected $7.99 charge, and adding a second (different) programmer raised shipping less than $1.I called Mouser, and the sales guy found the same numbers. He told me Mouser just switched to a weight-based shipping calculation a few days ago. He fixed the charge based on my estimate of the weight, and said he'd send the issue on for analysis.Has anyone had a similar experience?

author: sokoloff
author_rank: Super Contributor
timestamp: July 07, 2018, 11:30:35 pm
content: Not with Mouser, but I run logistics for an e-commerce company and these type of bugs are often traceable to bad or missing product catalog data, especially if no one ever used the weight field for something. Maybe someone entered 1 (intending grams) into a field labelled kilograms. Maybe the weight is missing and they have it programmed to assume a default weight that's too high.Complaining is the right (and probably only) thing to do.

author: rdl
author_rank: Super Contributor
timestamp: July 07, 2018, 11:39:43 pm
content: Yeah, something in your order must have the weight entered incorrectly in their system or some similar problem. I think a $30 charge for ground in the same zone would probably have to be somewhere over 50 lbs.

author: German_EE
author_rank: Super Contributor
timestamp: July 08, 2018, 08:44:50 am
content: Just order more than fifty Euro and get free shipping.

author: Nusa
author_rank: Super Contributor
timestamp: July 08, 2018, 09:10:12 am
content: Quote from: German_EE on July 08, 2018, 08:44:50 amClearly a regional deal that doesn't apply to US buyers.Just to check, I put $200 (=170 euro) of in-stock resistors in the mouser cart and shipping was still $7.99
YouTube Send & receive private messages - Page 1
Forum section: electronics / general

author: joeqsmith
author_rank: Super Contributor
timestamp: July 07, 2018, 03:43:55 pm
content: Been seeing this for a while now. I wonder what they plan to focus on. More annoying pop-ups perhaps that never go away? Maybe they will start asking me to use Chrome again in more clever ways.Quote

author: Towger
author_rank: Super Contributor
timestamp: July 08, 2018, 07:40:23 am
content: Probably GDPR related. You may find the PMs were not very private (easy accessed by their staff etc) and the easiest option is to do away with the feature.
USITC sides with Motorola in Hytera patent dispute (DMR) - Page 1
Forum section: electronics / general

author: maiekmire
author_rank: Contributor
timestamp: July 06, 2018, 01:54:56 pm
content: Could be a big hit for Hytera, but I'm guessing they will have firmware workarounds.https://www.worldipreview.com/news/usitc-sides-with-motorola-in-hytera-patent-dispute-16279Motorola's complaint pdfhttps://newsroom.motorolasolutions.com/content/1107/files/ITC_Complaint.pdf
Patreon captcha: Can't update your browser without problems either.  - Page 1
Forum section: electronics / general

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: July 04, 2018, 09:33:43 pm
content: Following the grief this captcha is causing on Patreon, found out tonight that if you update your browser it then thinks you're logging in from an 'unknown device' and requires special verification.'Stupid' just doesn't even begin to describe this. Since it will deter people from patching/updating, it is a security risk in its own right.At the moment it's just Patreon doing this, but imagine if numerous sites did the same.It seems you can fool it by changing the useragent string back to the old value, but most users wouldn't know how to do that.

author: rstofer
author_rank: Super Contributor
timestamp: July 04, 2018, 09:37:25 pm
content: I can just imagine... Considerably reduced traffic would be my first guess. I don't have time for messing around with cantankerous web sites.

author: rdl
author_rank: Super Contributor
timestamp: July 05, 2018, 11:41:35 am
content: I've already switched from Newegg to Amazon whenever possible because of the recaptcha bullshit that Newegg added not long ago. I'm not against verification in general, but there are other ways to do it that are quicker and don't piss off your customers.
Teardown & Repair of an Agilent E4440A 3Hz - 26.5GHz PSA Spectrum Analyzer - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: July 04, 2018, 07:26:56 pm
content: TSP #124 - Teardown & Repair of an Agilent E4440A 3Hz - 26.5GHz PSA Spectrum AnalyzerThe Signal PathPublished on Jul 4, 2018The Signal Pathwww.TheSignalPath.comwww.YouTube.com/TheSignalPath