hybridfree/eevblog-posts huggingface dataset:
A question about shipping replacement boards into China - Page 1
Forum section: electronics / general

author: cvanc
author_rank: Frequent Contributor
timestamp: September 07, 2018, 02:32:59 am
content: I have some boards to ship from the USA to China. These are industrial motherboards and they contain two bootable devices - one hard drive and one PCMCIA memory card (they are old designs).I am being told to remove both from the boards before I ship them, as China Customs will not allow them and would probably confiscate the shipment. This is something I *really* don't want to happen, as you might imagine.I'm wondering if any of you have been in this situation and can offer up comments. Is it really true that I can't just leave the drives installed on the boards? What if I ship the drives by themselves in a separate box? Any other suggestions?All comments are welcome; I am by no means an expert on international shipping and I don't want to get this wrong. Thank you!

author: LapTop006
author_rank: Unknown
timestamp: September 07, 2018, 05:27:59 am
content: Whatever you do ensure you have images of the drives before they leave, so you can at least replace the data.I've not had, or heard of, issues like this in the past (not *trusting* any drives leaving China / Russia / etc. is common), but it does seem plausible.
It's September! - Page 1
Forum section: electronics / general

author: tooki
author_rank: Super Contributor
timestamp: September 06, 2018, 07:49:12 pm
content: I wonder if anyone ever tried seeing how the floppy drives from Macs behave as music transducers, since Mac floppy drives use a mode (GCR) for DD disks that's what we now call CLV, where the disk spins slower when accessing outer tracks, so the drives are themselves a bit different to support the variable rotation speed. (That's also why USB floppy drives cannot read 400K and 800K Mac floppies, only the 1.4MB ones that are identical to PC floppies, other than the file system.)
Really nice segmented colour LCD display [mikeselectricstuff] - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: September 06, 2018, 10:09:43 am
content: Cheers Mike, what an interesting video.

author: amyk
author_rank: Super Contributor
timestamp: September 06, 2018, 11:59:19 am
content: https://en.wikipedia.org/wiki/Field-sequential_color_systemApparently available in full graphic LCDs too:https://static1.squarespace.com/static/54dd8a95e4b03fb98aad7345/t/593c0af3bebafb0e231d7d70/1497107188933/Z86D-3C+datasheet.pdf

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 06, 2018, 02:00:26 pm
content: There was a tablet that used such a time domain multiplexed color display technology. The hard part is getting the pixels to transition fast enough.

author: tooki
author_rank: Super Contributor
timestamp: September 06, 2018, 04:37:45 pm
content: Quote from: NiHaoMike on September 06, 2018, 02:00:26 pmIt is in passive matrix displays. And that's precisely why we use TFT (thin-film transistor) active-matrix displays, because the transistor helps to transition the pixels (which are nothing but tiny segments, after all) quickly.As the datasheet in amyk's post demonstrates, it's possible nowadays to make LCDs that support hundreds of Hz.It'd be fascinating to see a large flat-panel TV or something using that system. But man would it have to be fast! (I'm quite sensitive to the DLP rainbow effect, which is precisely because of the fairly slow field rate in cheap DLP projectors. High end ones are perfectly fine.)

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 06, 2018, 04:47:22 pm
content: I think the main reason (other than cost) there aren't any current tablets using that technology is because refreshing the LCD so often offsets the power savings of eliminating the color filter losses. There's also a few displays that have blue backlights with red and green phosphors in the panel to eliminate the color filter losses without having to increase the refresh rate.One unique advantage of time domain multiplexed color displays is a low power black and white mode as a competitor to Eink. It can even be designed to not require a backlight in that mode.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 06, 2018, 06:58:08 pm
content: There was a line of Tek scopes back in the day (late 80s/early 90s?) that used a B&W CRT behind a "color wheel" LCD. They're notorious for the display growing bubbles (because of the optical gel between elements) or just dying outright...(Back in the day -- when color TV was new -- CBS introduced an experimental color-sequential system that used an enormous wheel, with RGB colored gels on it, to run color TV at 20 FPS. Upsides: compatible with existing B&W TV, no loss of resolution. Alas, it didn't catch on, as you can surmise.)Tim
good easy to install linux+truecrypt thats can dual boot with windows 7 - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: September 06, 2018, 12:32:45 am
content: I am going overseas to travel. I have a shitty new laptop, I wanted to dualboot Windows 7 (for a few games) and some kind of more secure linux, with whole drive encryption on everything.Does anyone have any suggestions? My previous experiments with archlinux have been annoying.I was hoping it would play Steam games at least (on the linux), but I require windows for some odd-ball gamesI don't have much time, only a few days and I am busy, so I would like to avoid fucking around with trying to make a FD encrypted dualboot (truecrypt) work, I found there are problems. I also don't have time to trouble shoot WINE or whatever. I need to be able to relax on the trip with games.I will have access to a residential connection so I can use windows there somewhat safely behind my own router, but I expect to spend a bit of time in hotels and airports and such so I need linux too.My first choice was mint but alot of people are like WTFNOOB so I thought I would ask. Might go to some shady countries like Ukraine and other old soviet republics.. I do plan on wiping the thing when I get back anyway. Don't know what will happen with a laptop in a Ukranian starbucks lolThe laptop is a Lenovo.I just wanna know if someone got something working first try with out having to spend monsterous amount of time on forums.Otherwise I will just mod a disconnect switch to the HD powersupply and just use a liveCD and truecrypt on the windows*whatever strain of truecrypt is good now I mean, not the original defunct one

author: coppercone2
author_rank: Super Contributor
timestamp: September 06, 2018, 12:51:21 am
content: I don't want to carry something over between nations or have to reinstall windows every time.I intend to go travelA->BB->AA->CC->Afrom a home base in a country I consider safer. All those wipes will be fucking annoying and time consuming.And because I can play some counterstrike or something from hotel internet in worse areas.But anyway I still wanna FDE dual boot that is known to work decent. I can't afford any hardware. Probably won't even take computers to places like Belrus, Ukrainian front lines, etc lol

author: coppercone2
author_rank: Super Contributor
timestamp: September 06, 2018, 01:10:35 am
content: I gotta visit family, I can't control timing or their location

author: ebclr
author_rank: Super Contributor
timestamp: September 06, 2018, 02:11:18 am
content: Install Vmware and many virtual machines witch any Linux you want there, Also VPNs are wide available anywhere

author: coppercone2
author_rank: Super Contributor
timestamp: September 06, 2018, 02:17:27 am
content: totally forgot about Vm's
Who's the proud granpa  - Page 1
Forum section: electronics / general

author: MK14
author_rank: Super Contributor
timestamp: September 06, 2018, 01:29:54 am
content: Congratulations!

author: alpher
author_rank: Frequent Contributor
timestamp: September 06, 2018, 01:39:00 am
content: Thanks, I don't know why but I feel so happy, maybe even more than when I had my own.

author: Brumby
author_rank: Unknown
timestamp: September 06, 2018, 01:45:32 am
content: That's because you can be proud as punch - and then hand them back at the end of the day.Congratulations.

author: alpher
author_rank: Frequent Contributor
timestamp: September 06, 2018, 01:56:21 am
content: Thanks.
Kangaroo - Page 1
Forum section: electronics / general

author: Puffin
author_rank: Unknown
timestamp: September 04, 2018, 02:27:22 pm
content: There's a kangaroo loose in Austria, not Australia!

author: John B
author_rank: Frequent Contributor
timestamp: September 04, 2018, 10:08:54 pm
content: Looks like a wallaby. Probably from a zoo with a 1m high fence enclosure, where the staff said "She'll be right!"

author: Halcyon
author_rank: Unknown
timestamp: September 04, 2018, 10:47:36 pm
content: Quote from: John B on September 04, 2018, 10:08:54 pmIt's been on the news here. Sounds like it was someone's pet. The zoos have reported that all Kangaroos/Wallabys are accounted for.

author: VK5RC
author_rank: Unknown
timestamp: September 04, 2018, 11:45:45 pm
content: There's always a few 'loose roos in the top paddock' in Australia! HiHi

author: bsudbrink
author_rank: Frequent Contributor
timestamp: September 05, 2018, 03:57:19 pm
content: Tie me kangaroo down sport.
Why boost Chopper circuit is not working? - Page 1
Forum section: electronics / general

author: radhika
author_rank: Regular Contributor
timestamp: September 04, 2018, 10:26:06 am
content: Respected,I am Electronics student as current working on boost chopper circuit. I want to convert 3.7V to 19.5V using PWM of Arduino as shown in attached link.According to requirements, Vin = 3.7V Vout = 19.5V, D = 81.02%, R = 50 Ohm, I = 2.5A, F = 100kHz.According to the formula, Lmin = (D((1-D)^2)R)/(2F) = 7.3uHCin = (I*D* (1-D)*1000)/(F*75m) = 50mFCout = (D)/(R*Vout*F) = 8.30nFUsing this formula I got required values, but still I am getting incorrect voltage. Is formula's are wrong or the circuit connection or the code. Where do I need to do improvement? Please guide.The Code i used for developing 81.02% duty cycle is :int ledPin = 9;void setup(){pinMode (ledPin, OUTPUT);}void loop(){analogWrite(ledPin, 206);}https://postimg.cc/image/f4kkolo0n/https://postimg.cc/image/gm6100853/

author: tom66
author_rank: Super Contributor
timestamp: September 04, 2018, 11:16:25 am
content: Is your circuit operating in continuous or discontinuous mode?Your output capacitor of 8.3nF with a 2.5A load is suspect. At 100kHz, I would expect more in the range of ~100uF.Be aware that if you do not have feedback, the output voltage will change by a large factor between load and no load situations.Also, this thread is in the wrong place.

author: radhika
author_rank: Regular Contributor
timestamp: September 04, 2018, 01:29:44 pm
content: Hello,This circuit operating in continuous mode.Can you guide me that how do I calculate the output capacitor and inductor value at required Vin and frequency for the 19.5V as output voltage.Thanks

author: tom66
author_rank: Super Contributor
timestamp: September 04, 2018, 02:39:57 pm
content: Well, I don't know. I would simulate your circuit in something like LTSpice if you are unsure.I know that from experience you are not going to make a boost converter with any substantial load operate from 8.3nF output capacitance.I note that your Cout equation does NOT have a ripple input, which I would normally expect, as the output capacitor determines the ripple amplitude.

author: radhika
author_rank: Regular Contributor
timestamp: September 05, 2018, 12:55:08 pm
content: The load current is around 2.5A.Can you guide me the correct formula for getting this circuit work?
EMI shielding material - Page 1
Forum section: electronics / general

author: nox1492
author_rank: Newbie
timestamp: September 04, 2018, 10:46:40 pm
content: Hi,I am looking for a material to shield interferences between a few 10 khz to a few 100 khz. I want it to be cheap and I don't mind if it is thick.I remember that on the hood of some cars there were some foam or fabric that was sticked above the engine. I don't know if this kind of material was used for EMI shielding or some thing else.Materials used used in the automobile Industrie would be cheap, since manufactured in large scale.Thanks.

author: rhb
author_rank: Super Contributor
timestamp: September 05, 2018, 12:32:49 am
content: At low frequencies the cheapest option is low carbon steel. Mumetal is better, but expensive since it is almost pure nickel.How large an enclosure do you need? A deep drawn, surface mount electrical box 4"x4"x2" covered with aluminum or copper foil tape should work fairly well. Otherwise, 1/4" cold rolled steel plate screwed together at the edges. Scrap 1/2" mild steel plate if you can afford the weight, have a scrap yard nearby and want to keep the cost to a minimum.Low carbon steel is used for formed articles. So almost any thick steel stamping is a good choice. Ideally it should be annealed, but that requires raising it to 900-925 C for about 5-6 hours and then slowly cooling it.You might want to read through this thread:https://www.eevblog.com/forum/metrology/shielded-test-chamber/msg1471450/#msg1471450

author: Eka
author_rank: Regular Contributor
timestamp: September 05, 2018, 03:21:23 am
content: The last EMI shield I made used two identical cheap steel toaster oven pans facing each other with their non stick coating ground off where they touched each other. I also had a flexible conductive gasket between them. To get wires in and out, I drilled holes, then used an awl to lift up one side and depress the other side. Then I fed the wire through, and used small plates of steel inside and outside to clamp the wire. I also applied a conductive glue to the plates.For another project I used conductive paint made for EMI shielding to line a 3D printed box interior the circuit ran in.I also will use copper foil tape that has conductive adhesive. You can get large sheets if you wish to pay for them.

author: Zero999
author_rank: Super Contributor
timestamp: September 05, 2018, 12:22:34 pm
content: LOL Good suggestion for hobby/prototypes, but I don't think the toaster oven pads are suitable, unless it's possible to buy them in huge quantities, as the original poster seems like he wants to mass produce this.Yes, steel is the way to go. Copper tape is better at high frequencies and screening the E-field but is no good for low frequency B-field, when a ferromagnetic material is better.
Self driving cars and more from 1953...1972 - Page 1
Forum section: electronics / general

author: RoGeorge
author_rank: Super Contributor
timestamp: September 04, 2018, 04:30:08 pm
content: Driverless Car 1971Farm Robot 1958Auto Tractor 1969French Taxi 1972Billy the Beacon 1953

author: Tomorokoshi
author_rank: Super Contributor
timestamp: September 04, 2018, 04:33:33 pm
content: Batmobile ~1967.

author: helius
author_rank: Super Contributor
timestamp: September 04, 2018, 04:53:57 pm
content: Tractors for the past 20 years have been GPS steered. Not driver-less, but automated for the majority of the time.A look at the history of transportation technology shows plenty of futuristic, automated designs, but the common thread is an unjustified faith in technology and blindness to matters of safety and reliability. TheAramisconcept is a good example: a "Personal Rapid Transit" system designed to drive passengers to any location, it was clearly a mugging waiting to happen.

author: RoGeorge
author_rank: Super Contributor
timestamp: September 04, 2018, 06:11:23 pm
content: Since you mentioned the GPS, here is an alternative from 1971:
Voltlog #179 - How To "Solder" Through-Hole Parts - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 04, 2018, 03:43:56 pm
content: Voltlog #179 - How To Solder Through-Hole PartsVoltLogPublished on Sep 4, 2018In this video I’m gonna show you how to solder through hole parts. I’m gonna take you step by step through the procedure as well as give you several tips & tricks that should bring your soldering skills to a new level.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 04, 2018, 03:55:59 pm
content: Given the timing, was that his answer to the videos that show it being done wrong?https://www.eevblog.com/forum/chat/instructional-videos-on-how-not-to-do-things/

author: voltlog
author_rank: Regular Contributor
timestamp: September 04, 2018, 04:54:40 pm
content: Quote from: NiHaoMike on September 04, 2018, 03:55:59 pmI had the idea of doing a tutorial for smd soldering and another one for through hole soldering for over a year. I managed to do the SMD soldering tutorial back in may and just now this one for through hole parts. I am not trying to correct or show anyone how it's done. It's just my way of doing things, I'm sharing my tips & tricks. There are probably other ways of doing it right as well.
Back to the Future Delorean Time Machine - Detailed Review and Ride Along - Page 1
Forum section: electronics / general

author: The Lavian
author_rank: Newbie
timestamp: September 04, 2018, 06:17:08 am
content: CLICK HERE TO BUY THIS CAR!https://www.ebay.com/itm/253843673045This is the most detailed review, walk through and ride along of a Delorean Time Machine ever done, a full hour of an in depth at one of the best Time Machine replicas ever made by Bob's Prop Shop in Dallas Texas, this being the 24th car they have built is a car for sale and this video will show every inch of how it works!https://youtu.be/hMPmF_FhcTw
a Bugatti chiron made of lego that you can drive :) - Page 1
Forum section: electronics / general

author: JPortici
author_rank: Super Contributor
timestamp: September 02, 2018, 12:26:12 pm
content: https://edition.cnn.com/2018/08/30/europe/lego-bugatti-trnd/index.html

author: timgiles
author_rank: Regular Contributor
timestamp: September 02, 2018, 12:50:29 pm
content: Amazing. At first I thought it was a Chiron with a lego skin, but the only parts that are not lego are:WheelsAxlesChassisBattery(s)The documentary (8 mins) shows just how little of the original car was used as a base. Seriously impressive, 1 million plus parts, 2300+ motors. I do not know if can steer though or if it can, by how much. Seems to get up to a reasonable speed (ie. faster than walking!) but looks like it was a bit bumpy.Looks like the motors are linked to a some sort of non lego battery. Likely with weight being an issue LiPo or some derivative. The motor block has some pretty thick cables coming off it.:-)

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 04, 2018, 04:56:13 am
content: The pneumatic lego car probably drives way better (lighter).
My first Uni-T meter! No a bad wee thing! - Page 1
Forum section: electronics / general

author: Terry01
author_rank: Frequent Contributor
timestamp: September 04, 2018, 03:13:59 pm
content: I got a Uni-T 210E delivered this morning! I had forgotten I even ordered it! A nice wee surprise!I must say I am quite impressed with it for what it is. It cost 25 - 30 quids, looks more like a dinky toy than a piece of "test equipment" and it's from a brand that has a so so name. Some love it, some hate it! Like Marmite! Anyways,,,,,I have been messing about with the meter for an hour or 2 now and from what I can see it does ok. This is my 1st clamp meter and I think it will come in well handy!Just goes to show right?

author: stj
author_rank: Super Contributor
timestamp: September 04, 2018, 03:47:58 pm
content: do a search, it's heavily mod'able.6000 or even 10,000 count with increased range,and customising of the power and backlight timers.

author: Terry01
author_rank: Frequent Contributor
timestamp: September 04, 2018, 05:34:30 pm
content: Quote from: stj on September 04, 2018, 03:47:58 pmCool!I am still a bit green when it comes to "modding" meters or doing anything like that. That's not to say I won't give it a go though!I quite like the sparks and smoke now and then Ha Ha!I'll have a look for the videos on modding mine for sure!Thanks!
Who bought the Fluke 5700A from ebay italy this time? - Page 1
Forum section: electronics / general

author: e61_phil
author_rank: Frequent Contributor
timestamp: September 03, 2018, 04:30:24 pm
content: Hi,I saw the Fluke 5700A was sold again for 1510€. Hopefully the buyer is aware of the fact, that the seller is a fraud.Best regardsPhilipp
OpenPNP and other stuff server requirement - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: September 02, 2018, 06:31:02 pm
content: Hi gurus here,I'm looking for a computer that can do the following things as a home server:1. Control an OpenPNP-based PnP machine (OpenPlacer) with 2 cameras,2. Control a GRBL-based CNC (Carbide 3D Nomad 883 Pro),3. Serve files from a relatively slow HDD array (software RAID 1, up to 200MB/s) over Windows file sharing,4. SMB also shares a Canon printer,5. Run a Brother scanner,6. Stream desktop to another computer over RDP remote connection.What kind of hardware should I need?Here are two candidates that I have:1. Intel NUC with Haswell i3, 8GB RAM, 256GB SSD2. Intel NUC with Kabylake i5, 16GB RAM, 512GB SSDI have both, but I want to sell one for some cash. Since I don't have OpenPlacer set up already, I can test out for real.The second one has a 28W CPU that's more powerful than most high end Ultrabooks, so I have no doubt for it.However, I prefer to use the first one since I can't really sell the first one for any reasonable amount of money, so I prefer to get rid of the second one.OpenPNP knowledge is much appreciated from PnP gurus here.

author: Halcyon
author_rank: Unknown
timestamp: September 03, 2018, 03:48:21 am
content: What you want to achieve is relatively low-end stuff. They don't take a lot of computing resources at all (even all at the same time).Your i3 NUC would do the job fine, but I guess it depends on how desperate you are for the money? I'd keep i5 NUC for myself and sell the older one but as you've already stated, you already have a preference so go with that.Although, if at all possible, avoid Windows 10, it's complete garbage. I actually find it slower than Windows 7 in many ways.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 03, 2018, 12:46:23 pm
content: Does OpenPlacer actually use the cameras for machine vision during operation? That can be quite GPU intensive.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 03, 2018, 01:08:44 pm
content: Quote from: blueskull on September 03, 2018, 12:56:34 pmIt has improved by a lot. In mid 2017, I worked on a test setup that used GTX 580s (what they had lying around) as part of a machine vision system for automated testing.https://opencv.org/platforms/cuda.html
Science documentary with some time-nut content (and rigol!) - Page 1
Forum section: electronics / general

author: Dubbie
author_rank: Unknown
timestamp: September 02, 2018, 08:45:53 pm
content: Just watched a popular science documentary on Netflix called "The Most Unknown". It looks at 9 different scientists and their work.One of the scientists is the lead of the team that built the most accurate clock to date. The documentary has some very interesting glimpses of the inside of his lab and also NIST.I got a chuckle when they were doing the requisite "blinking lights and screens" shots to set the scene inside the NIST lab, and there was a good old 1054z with some traces flickering up and down! (alongside a bunch of old CRT HP spectrum analyzers).Anyway, while the documentary was not technical, it was a nice inspirational science-fest if you're looking for something to watch on Netflix.
Drawing editors - Page 1
Forum section: electronics / general

author: gogoman
author_rank: Regular Contributor
timestamp: August 25, 2018, 05:16:50 pm
content: Hi are there any free editing tool which allows the editing of PDF + .DWGthanks

author: GlennSprigg
author_rank: Super Contributor
timestamp: September 01, 2018, 01:38:10 pm
content: Proprietary .DWG has been the bane of 3rd party people since inception.For OpenSource (free) editing,1sttry converting those files to '.DXF'...On OnLine Converter......https://cloudconvert.com/dwg-to-dxfA Downloadable Converter......https://dwg-dxf-converter.en.softonic.com/?ex=CAT-752.0Then use the free 'Inkscape' vector/graphics software to open .dxf files.
First of the 25 posts on page - Page 1
Forum section: electronics / general

author: StillTrying
author_rank: Super Contributor
timestamp: August 31, 2018, 07:49:19 pm
content: I tend to remember the first post of the 25 on a page, especially if it's an image, or a reply from or to me.Anyone noticed that the first post on a page sometimes changes to another post, or is it just me(going nuts).As an example, I think this one used to be the first on a page, and now it's not, or is it some post deletions or something.www.eevblog.com/forum/projects/the-ubeam-faq/msg1713416/#msg1713416

author: Muttley Snickers
author_rank: Unknown
timestamp: September 01, 2018, 12:37:45 am
content: It generally means somebody has deleted posts prior to yours, if you made a post at say #100 in a thread and someone later removed two prior posts then your one would become #98, this will in turn place your post at a different location on that page or even on a prior page.

author: StillTrying
author_rank: Super Contributor
timestamp: September 01, 2018, 02:07:35 am
content: Delete 1st post test.Edit: As expected you can't delete the 1st post of a thread.An Error Has Occurred!You cannot delete your own topics in this board. Check to make sure this topic wasn't just moved to another board.

author: Brumby
author_rank: Unknown
timestamp: September 01, 2018, 05:35:27 am
content: No, you cannot delete thefirstpost of a thread, but youcandelete any ofyour ownposts after that.

author: Brumby
author_rank: Unknown
timestamp: September 01, 2018, 05:37:10 am
content: Quote from: Brumby on September 01, 2018, 05:36:34 amHere I am quoting it, so you can see it existed.

author: Brumby
author_rank: Unknown
timestamp: September 01, 2018, 05:37:54 am
content: Now I have I deleted it.

author: StillTrying
author_rank: Super Contributor
timestamp: September 01, 2018, 12:30:25 pm
content: I almost expect a deletion or 2 in a current thread, but I'm surprised when the deletion(s) from the previous page(s)must beof posts which are weeks/months old.I thinkyou can delete the 1st subject post as long as there are zero replies to it, because I seem to remember on at least one occasion I've posted a question, and them changed my mind and removed it, of course I might just be imagining it.Another useless snippet. The message numbers ( #msg1790588 ), increment over 10 times faster than the total number of visible posts.
Teardown, Repair and Analysis of an Agilent 8449B 1.0 - 26.5GHz Microwave Preamp - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: September 01, 2018, 06:12:27 pm
content: Teardown, Repair and Analysis of an Agilent 8449B 1.0 - 26.5GHz Microwave PreamplifierThe Signal PathPublished on Sep 1, 2018
Tools For The Bench- High Voltage vaccum  tube  Power Supply Repair! - Page 1
Forum section: electronics / general

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: August 31, 2018, 03:33:38 pm
content: Tools For The Bench- High Voltage Power Supply Repair!Mr Carlson's LabMr Carlson's LabPublished on Aug 30, 2018Let's repair a High Voltage power supply designed by Heathkit. This IP-32 power supply will make over 400 Volts, with a bias and filament supply as well. We will look at the schematic, and I will explain (with a demonstration) showing you how it functions.
MJE3055T LIBRARY for PROTEUS - Page 1
Forum section: electronics / general

author: radhika
author_rank: Regular Contributor
timestamp: September 01, 2018, 01:16:49 pm
content: Respected,Currently, I am working on a circuit which require the usage of MJE3055T transistor. I have MJE3055.LIB file for Proteus but I don't have MJE3055.IDX for Proteus. Is there any possible solution or path to download this .IDX file.Thanks
Back to the future... with a 500X :D - Page 1
Forum section: electronics / general

author: JPortici
author_rank: Super Contributor
timestamp: August 30, 2018, 03:05:56 pm
content: Enjoy(though i can't find the shortened ad)

author: Halcyon
author_rank: Unknown
timestamp: August 31, 2018, 06:16:03 am
content: Well done for actually getting Christopher Lloyd to star in it.
Star Trek TNG Warp Core - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 31, 2018, 02:10:00 am
content: Not sure why but I have to have this for my desk. It's just too cool.Will make a base for it with a built in power supply. Who knows, maybe Arduino control, additional leds, sound....https://www.ebay.com/itm/Star-Trek-The-Next-Generation-Warp-Core-USB-Car-Charger-Brand-NEW/222871985976?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160727114228%26meid%3D98d29f80a5d341da9bf6bb10ac23c873%26pid%3D100290%26rk%3D3%26rkt%3D4%26sd%3D323121053734%26itm%3D222871985976&_trksid=p2060778.c100290.m3507

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 31, 2018, 04:37:17 am
content: (Just FYI, you can shorten the ebay link to justhttps://www.ebay.com/itm/222871985976, this works for Amazon too).Also, do want, but a bit pricey... I wonder how good the charge circuitry inside is?
AD online product selector - range selection almost unusable? - Page 1
Forum section: electronics / general

author: splin
author_rank: Frequent Contributor
timestamp: August 30, 2018, 01:52:44 pm
content: It must be just me as they must have spent a fortune on the website and surely would have spent even a few minutes trying it out?Try as I might, I can't fathom out how to change one of the minimum/max values in one of their product selector tables *if* the value has a scale postfix -eg. 35M for an opamp GBW. I'm using Chrome on an Android tablet and a second or two after changing anything in the selector box it reverts to the original value. Firefox on windows can sometimes be made to work but I haven't worked out how to do it reliably. If the value is purely numerical it works as expected.This is such a fundamental feature, that has not worked properly (for me) for months at least, that I have to worry that senility is at work here ('old people and technology' as my sons' say).Will someone put me out of my misery and tell me where I'm going wrong? OTOH, if it is a genuine bug, how has it existed for so long? Does nobody use this feature?

author: splin
author_rank: Frequent Contributor
timestamp: August 30, 2018, 02:49:30 pm
content: Ok, just realized that selecting (highlighting) and replacing the whole field in one go works. Not a good solution as it can sometimes be infuriatingly difficult to get both text selection markers to appear on a tablet (in Chrome at least) after seemingly random combination of tapping and holding and holding, re-tapping and holding, cursing, adjusting tongue angle, tap and hold, hold, hold etc. etc.It looks like a bug to me after all - I guess they put as much effort into testing/reviewing their website as they do their datasheets...

author: splin
author_rank: Frequent Contributor
timestamp: August 31, 2018, 12:13:15 am
content: Quote from: splin on August 30, 2018, 02:49:30 pmHmm - it turns out that the 'select all' 'solution' isn't - some fields work, some don't and I'd tried it on one that does. For example in the 'High speed ADC >= 10 MSPS' table:http://www.analog.com/en/parametricsearch/10826#/'Maximum sample rate' can be edited without problem, 'Minimum sample rate' and 'Minimum power' can't. 'Maximum power' behaves even more strangely, probably because the obviously incorrect default of '1.2k' confuses the hell out of it!Time to report it to Analog, but still surprised no one else here encountered this. I know many hated the website revamp - are you all boycotting it altogether now? Fixed typo. Have now reported it to AD
Need help identifying this wire wound? resistor - wierd code - Page 1
Forum section: electronics / general

author: wanglese
author_rank: Newbie
timestamp: August 28, 2018, 01:58:58 pm
content: Hey eevblog people, apologies for this being my first post, so be niceI'm repairing my son's Shark Lift-Away vacuum cleaner. The rotary brush on the vacuum head seized, (dog hair I think), and a bush broke, and a resistor identified as R6. I THINK it's wirewound, it's ceramic but the colour codes have got me confused. No, it's blown so my multi-meter gets nothing.The colour bands are Brown, Green, Gold, Gold, Black (picture) I've looked for circuit diagrams etc and codes everywhere, but I'm at a loss, and Shark is no help whatsoever. There are pictures of the circuit board I have looked at but I think the resistor varies with country voltage?Oh, I 3d printed the new bush, and it's fine. Not prepared to plug in the power till I get this bit sorted

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 28, 2018, 02:26:24 pm
content: 1.5 ohms would be the first guess, but the wire seems rather thick for that? And the black band must be saying something (I don't know what offhand). May be 0.15 instead? But I don't know why they wouldn't use a silver band for that.This says noninductive:https://electronics.stackexchange.com/questions/330208/what-does-a-black-band-at-the-end-of-a-resistor-meanwhich would be 1.5 ohm, NI, and whatever the size suggests, 3W or so I guess?Tim

author: wanglese
author_rank: Newbie
timestamp: August 29, 2018, 11:29:59 am
content: Hey T3sl4co1l,that might be the thing. Tanks for finding that. Since it's a resistor on a driver board for a big motor on the vacuum brush, the non inductive bit might explain it.' I might have to look for a 1.5 Ohm 3W, something with ceramics which should be safe. Can't hurt to try it out. I'll report back.

author: Ian.M
author_rank: Super Contributor
timestamp: August 29, 2018, 01:44:32 pm
content: There's probably only one break in the wire or metal film element. Try scraping away enough of the ceramic coating to measure from each lead to the break, which should at least give you an estimate of its value to check against your reading of its colour code

author: Brumby
author_rank: Unknown
timestamp: August 29, 2018, 02:31:19 pm
content: Reading the bands:Brown. .Green. .Gold. .Gold. .Black15x 0.15%250ppmSo: 1.5 ohm 5% with 250ppm/ºC temperature coefficient
Newsreader blames downed flight on a failed flux capacitator - Page 1
Forum section: electronics / general

author: Tomorokoshi
author_rank: Super Contributor
timestamp: August 30, 2018, 03:46:42 am
content: A failed flux capacitator? Really? What is this world coming to?Clearly, it was actually caused by a failed turbo encabulator!

author: vk6zgo
author_rank: Super Contributor
timestamp: August 30, 2018, 05:32:56 am
content: Sometimes I despair!A couple of weeks ago there was a TV news report on someone who backed their car out of the second level of a multi storey car park, & was left dangling perilously "half in, half out".The newsreader stated that the driver "Put her foot on the "reverse pedal" by mistake."I think Ford "T" models had something like that, but I've never heard of it otherwise.

author: SparkyFX
author_rank: Frequent Contributor
timestamp: August 30, 2018, 05:38:27 am
content: So he had reached 88MPH, but it did not work? That´s an outright scandal. I am sure the lack of unobtanium leads too piss poor quality flux capacitors, so manufacturers need to rely on turbo encabulators. OTOH i never had a failed turbo encabulator.

author: Bud
author_rank: Super Contributor
timestamp: August 30, 2018, 06:21:35 am
content: The flux capacitor was made in China.

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: August 30, 2018, 09:09:06 am
content: Oh, dear, see what happens when the flux capacitators go bad.

author: IanMacdonald
author_rank: Frequent Contributor
timestamp: August 30, 2018, 12:06:50 pm
content: Quote from: GeorgeOfTheJungle on August 30, 2018, 09:09:06 amTo a certain extent the problem is self limiting, since once past the use-by date they are very hard to solder in.

author: EEVblog
author_rank: Unknown
timestamp: August 30, 2018, 12:17:12 pm
content: First class prank, well done sir

author: Cerebus
author_rank: Super Contributor
timestamp: August 30, 2018, 03:19:36 pm
content: Quote from: vk6zgo on August 30, 2018, 05:32:56 amI wouldn't be surprised to find a Citroen with an arrangement like that, they've had all sorts of odd arrangements over the years. A former boss had a high end Citroen that I inherited after he left the company and I had to drive for a (mercifully short) while. It had the handbrake release on a pedal to the left of the clutch pedal, which made for veryinterestinghill starts involving a little right foot dance between brake and accelerator while doing a left foot dance of release handbrake, declutch, engage 1st gear, find clutch biting point without stalling.

author: David Hess
author_rank: Super Contributor
timestamp: August 31, 2018, 01:15:33 am
content: Flux capacitors for aircraft use are kept next to the prop wash and flight line.

author: vk6zgo
author_rank: Super Contributor
timestamp: August 31, 2018, 01:03:56 pm
content: Quote from: Cerebus on August 30, 2018, 03:19:36 pmThe foot "handbrake" is not uncommon--- some US cars used them, & from memory one model of Holden Torana did the same.The next model changed to a normal one.
EEVBlog gets a mention in September Silicon Chip Editorial - Page 1
Forum section: electronics / general

author: snoopy
author_rank: Frequent Contributor
timestamp: August 28, 2018, 06:44:16 am
content: September Silicon Chip Magazine for those of you who have not received it yet, makes mention of the EEVblog youtube channel as a serious alternative to free to air TV

author: Brumby
author_rank: Unknown
timestamp: August 28, 2018, 06:53:10 am
content: Will be interesting to see if there is any discernible increase in Dave's stats in the next couple of months ....

author: wilfred
author_rank: Super Contributor
timestamp: August 28, 2018, 09:51:34 am
content: Quote from: snoopy on August 28, 2018, 06:44:16 amHmmm. That could be said to bedamned with faint praise.
Powertech MP-3087 Half working - Page 1
Forum section: electronics / general

author: lesquishy
author_rank: Newbie
timestamp: August 29, 2018, 06:33:19 am
content: Alright. Well...Today i went out and bought a Powertech MP-3087 from Jaycar because i needed one immediately. Got home, Set it up, Swtiched it on and... only one display lights up.Im no expert but as far as i can tell the other side doesn't work. There no output I cant find anything online about something similar.Am i just being dumb and i need to switch it on somehow or is it broken? Any help is Greatly appreciated <3Thanks in advanced
Alfred Leitner - Liquid Helium and Superfluidity 1963 - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: August 25, 2018, 04:54:28 am
content: Those super-fluid properties are weirder than I originally thought. It has no viscosity, yet, you can still stir the fluid and still have reactionary flow. Also, that weird effect of the fluid instantly becoming 1000x more thermal conduction than copper the moment it passes that temperature threshold, or, over 1000000 times more thermal conductive than 1 second just before the superfluid transition point lambda.It's definitely worth the watch...

author: raptor1956
author_rank: Frequent Contributor
timestamp: August 25, 2018, 05:56:47 am
content: That was a very interesting video, it always amazes me to think of what they were capable of doing with technology that's 55 years old. Impressive.Brian

author: Tomorokoshi
author_rank: Super Contributor
timestamp: August 27, 2018, 03:59:48 am
content: Very interesting series.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 27, 2018, 05:04:24 am
content: Quote from: BrianHG on August 25, 2018, 04:54:28 amI recall something about Feynman having a go at the problem, and -- while not coming to a conclusive answer, unsurprisingly as condensed-matter physics is notoriously difficult and we still don't have one today(?) -- figured there were quantum vortices, i.e., the vorticity and inertia will be quantized.Tim
High voltage on perfboard - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 26, 2018, 07:13:13 pm
content: Reminds me of an "analog computer" someone built decades back to calculate the shortest path between two points on a map. It was basically a map of some city (New York IIRC?) etched onto a PCB, with the roads marked as dashed lines and empty space everywhere else. To find the shortest path between two points, connect a high voltage transformer between them and give the board a zap.
Q. When is a Harbor Freight meter worth $25? - Page 1
Forum section: electronics / general

author: breadbox
author_rank: Contributor
timestamp: January 14, 2016, 08:16:45 pm
content: A. When your local (Boston area) electronics dealer offers a dead-or-alive trade-in discount toward the purchase of a new multimeter.Their prices run high, though, so that $25 discount might be more like $10 or $5 or $0 when you take online competition into consideration.http://www.youdoitelectronics.com/Promotions/

author: Falcon69
author_rank: Super Contributor
timestamp: January 15, 2016, 12:05:48 am
content: I always treat all Harbor Freight tools as a one use time. Use em once, throw em away. There has been several times I have needed a tool to complete a job, and either i couldn't afford a REAL tool at the time, or Harbor Freight was closer.Their tools are just crap. Even their Bunjee Cords and ZipTies are junk.

author: 6PTsocket
author_rank: Regular Contributor
timestamp: August 25, 2018, 11:41:20 pm
content: Quote from: Falcon69 on January 15, 2016, 12:05:48 amYou haven't bought the right HF tools. I don't want to cover what has been commented on many times but some stuff like their tool cabinets are very well reviewed. Their Eartquake air tools are usually very good. Their better grade impact sockets are fine.There are whole threads devoted to the good and bad at HF. Their 5hp air compressor is made by IMC and a good unit for the home garage. Yes, there is plenty of garbage, too. The QC is terrible so it is often a matter of getting a good one. My second attempt at kitchen scale has worked for years. It matches the weights from the deli to a couple of decimal places.Sent from my SM-G900V using Tapatalk

author: GreyWoolfe
author_rank: Unknown
timestamp: August 26, 2018, 06:53:46 pm
content: My HF compressor and all but 1 of my nail guns are over 12 years old and they work when I need them to. My only issue with my compressor was my lack of knowledge and buying one too small for everything I would like to do. When it gives up the ghost, I will see what I can do at that point. I am on my 3rd tire inflator with gauge but I do use the crap out of it and one of them I broke.
how its actually made - Page 1
Forum section: electronics / general

author: tooki
author_rank: Super Contributor
timestamp: August 26, 2018, 12:34:32 pm
content: Hah, that's fantastic!I trust you've seen the "True Facts" series of animal videos?

author: Ampera
author_rank: Super Contributor
timestamp: August 26, 2018, 03:02:30 pm
content: These are pretty good.True facts is also nice, ZeFrank is the only alright person who is even remotely connected to BuzzFeed.

author: coppercone2
author_rank: Super Contributor
timestamp: August 26, 2018, 03:31:00 pm
content: no, link some good ones
Whats the oldest electronic video on youtube? - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: August 26, 2018, 12:12:02 pm
content: This to build an ELF radio from 2008. Way before eevblog.

author: EEVblog
author_rank: Unknown
timestamp: August 26, 2018, 01:10:06 pm
content: Mike's Electric Stuff was uploading stuff back in April 2007, but videos where he talked weren't until 2010 by the looks of it.Fat Man and Circuit Girl had a live show back in at least 2008 I think.I don't recall other names off-hand.I wasn't the first with electronics, but I think maybe the first with a "video blog" style regular electronics channel. Certainly the first to go full time at it in April 2011.

author: Beamin
author_rank: Super Contributor
timestamp: August 26, 2018, 01:21:27 pm
content: Quote from: EEVblog on August 26, 2018, 01:10:06 pmLets hope google doesn't get greedy with the ad revenue and make doing youtube full time impossible. Although I hear if patreon wasn't a thing many would have left. In some ways patreon is bad because it lets these companies off the hook from paying their fair share. Without video creators youtube is nothing or it will turn into cable TV/hulu service.
Anybody going to Electronex (Sydney)? - Page 1
Forum section: electronics / general

author: D3f1ant
author_rank: Frequent Contributor
timestamp: August 24, 2018, 09:26:25 pm
content: Not been to one of these for many years, am in Sydney while it's on so thought would pop in for a look.

author: Brumby
author_rank: Unknown
timestamp: August 25, 2018, 01:10:14 am
content: You might want to check this out:2nd EEVblog meetup!

author: julianhigginson
author_rank: Frequent Contributor
timestamp: August 25, 2018, 02:35:23 am
content: I'll probably pop into electronex..not sure when yet.last time it was pretty dead compared to previous years, but who knows.. I'll possibly see something useful or meet a new distributor for something I don't know about.
Simple Camera Surveillance system (looking for a tip)? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: August 24, 2018, 05:55:34 am
content: Hi All,We bought a house some time ago, but because renovations we can not move in. Got a text from my new to be neighbour yesterday, that 2 people came out of a car, where walking around our house. They asked them if they could help them, but they didn't responded. Now this house is close to the forest in somewhat remote area (does have a Jablotron alarm system).I already planned some camera's around the house, but since we are planning for a extra floor (which will not start before march '19: permits, winters, etc), I am wanted to look into to that next year (connect it to HA).Now looking for a simpler system. That could track movement (make photo) and store it on a SD card (since i have no Internet there yet). And of course needs to be outside.Now I'm looking for something that is really simple to installed (so I don't need to get wires installed, etc.). Anybody has a good tip?Much obliged.Thanks.

author: Gromitt
author_rank: Regular Contributor
timestamp: August 24, 2018, 08:36:08 am
content: Perhaps something like this: (in swedish I'm afraid)https://www.maxjakt.se/produkt/MaxJakt-atelkameraI have no idea what this kind of camera is called in other languages.

author: onesixright
author_rank: Frequent Contributor
timestamp: August 24, 2018, 08:45:22 am
content: Thanks! Lookin at. Its called wild life camera I think.Sent from my iPhone using Tapatalk
Putting IR reflow oven (with slits on the bottom) on a stand - Page 1
Forum section: electronics / general

author: beeboopbeep
author_rank: Contributor
timestamp: August 20, 2018, 05:40:49 pm
content: Hi everyone,I recently purchased an IR reflow oven (T-962C) and I noticed there are small slits at the bottom of the oven so the PCBs inside are visible from the bottom of the oven. For those of you not familiar, the reasons for the slits being there is to allow air to flow out when the oven cools the inside with its fans in order to meet the required heating profile.My question is, can I lift the oven by approximately 7 cm and operate it without issues even though there are slits underneath? I was planning on putting the reflow oven on one of these:https://www.amazon.ca/gp/product/B00LOTQQ90/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1.As additional info, my floor is fake wood (laminated plastic material) and the slits are approximately 2 cm long and 0.2 cm wide (don't quote me on this..).

author: PointyOintment
author_rank: Frequent Contributor
timestamp: August 23, 2018, 07:55:43 am
content: You use your benchtop reflow oven on the floor?