hybridfree/eevblog-posts huggingface dataset:
EEVblog #421 - Melbourne Hackerspace - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 09, 2013, 08:21:09 am
content: Dave visits the Connected Community Hacker Space (CCHS) in Melbourne on Feb 5th 2013Check out the Cray Supercomputer, automated RFID door access system, 3D printers, various robots, and a chat with the head software developer for the Raspberry Pi.http://www.hackmelbourne.org/Andy Gelme is part ofhttp://lifx.co/Jon Oxer is part ofhttp://www.freetronics.comAlex Bradbury is part ofhttp://www.raspberrypi.orgDave.

author: lapm
author_rank: Frequent Contributor
timestamp: February 09, 2013, 04:03:08 pm
content: Damn looks like fun/handy place to be if you need access to some more advanced machinery to get those rare oneoff parts done...i believe theres couple hackerspaces in my country as well...

author: xDR1TeK
author_rank: Contributor
timestamp: February 10, 2013, 06:29:35 pm
content: Bunch of guys making stuff that later make more stuff. How do they find each other? Who pays for all these gadgets?

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: February 10, 2013, 09:07:01 pm
content: Quote from: EEVblog on February 09, 2013, 08:21:09 amDave ,I Really enjoyed this .I am also interested in having a hackerspace in chandigarh my hometown .i would be starting a new thread asking about help and ideas before i dive into it .This was a very very memorable video that would be close to my hart foreever

author: kfitch42
author_rank: Frequent Contributor
timestamp: February 11, 2013, 07:12:53 pm
content: I need to rewatch the video, but which cray model was that one exactly? I think he said it was a Y-MP.Does an iPad really have more compute horsepower than that thing?According to wikipedia (http://en.wikipedia.org/wiki/Cray_Y-MP):QuoteThe best benchmark I can find of the iPad (http://www.anandtech.com/show/5688/apple-ipad-2012-review/11) has numbers going up to 557.0 MFLOPS for the 3rd gen iPad. Which puts it in the ballpark (or at least the neighborhood) of a 2 processor Y-MP.

author: blackjames
author_rank: Regular Contributor
timestamp: February 14, 2013, 10:19:38 am
content: where is the hacker space located?

author: uprightsquire
author_rank: Contributor
timestamp: February 14, 2013, 11:55:56 pm
content: Near glenferrie station/Swinburne hackmelbourne.org
EEVblog #420 - What Is Calibration? - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 08, 2013, 09:23:05 am
content: Peter Daly, metrologist at Agilents world leading standards & calibration laboratory in Melbourne explains what calibration is.Dave.

author: firewalker
author_rank: Super Contributor
timestamp: February 08, 2013, 09:34:49 am
content: This should put a nail to the coffin.Alexander.

author: Unknown
author_rank: Unknown
timestamp: February 08, 2013, 11:02:17 am
content: Nice video! but I think Bob Stern who is a Senior Agilent Metrologist describes the process better in his series of videos; here's one in the series entitled "who can do adjustments"

author: free_electron
author_rank: Super Contributor
timestamp: February 08, 2013, 05:30:46 pm
content: Calibrate : see where it is against a traceable standard. When i apply 1 volt from a known source : what does the machine show ?Verify : see if it falls within allowed tolerances. If applied 1 volt and allowed 5% error (factory specs) does it fall in this window?Adjust : bring it back inside the VERIFIED range !!! that does not mean it will be exact ! It may be exact , but if it passes VERIFICATION the job is done !

author: EEVblog
author_rank: Unknown
timestamp: February 08, 2013, 10:04:56 pm
content: Quote from: jucole on February 08, 2013, 11:02:17 amOf course, those videos are fully prepared. I just hit record and put Peter on the spot.I did the same for the other videos coming up as well.Dave.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 09, 2013, 12:20:28 am
content: When I saw the title I couldn't help thinking of this...http://tinyurl.com/a5jz2ps

author: cwalex
author_rank: Frequent Contributor
timestamp: February 09, 2013, 01:14:48 am
content: Quote from: mikeselectricstuff on February 09, 2013, 12:20:28 am

author: EEVblog
author_rank: Unknown
timestamp: February 09, 2013, 08:36:20 am
content: Quote from: mikeselectricstuff on February 09, 2013, 12:20:28 amThat crossed my mind when I chose the title!Dave.
Dave's still camera... - Page 1
Forum section: electronics / general

author: nitro2k01
author_rank: Frequent Contributor
timestamp: January 30, 2013, 06:05:54 pm
content: I was curious about Dave's DSC, so I went to the Flickr stream and sure enough, it says which camera the images were taken with. It's apparently a Samsung WB2000.Image from theMechanical gauges for battery and space left on the memory card?! That's novel. Do they keep their state when the camera is turned off?

author: EEVblog
author_rank: Unknown
timestamp: January 31, 2013, 12:36:30 am
content: No, they don't keep their state.It's not a bad camera, but has a few firmware issues. Shoots good video and decent audio, and capable of great quality stills. I use this for my walktime rants on the end of my monopod, and the occasional impromptu video when I don't have the main cam available.Dave.

author: baljemmett
author_rank: Unknown
timestamp: January 31, 2013, 01:10:03 am
content: Quote from: EEVblog on January 31, 2013, 12:36:30 amI presume that's to deter the opportunistic miscreant from glancing at the gauge, spotting a full battery and then trying to siphon all the charge out...

author: EEVblog
author_rank: Unknown
timestamp: January 31, 2013, 02:19:34 am
content: Turns out I didn't have the latest firmware, so just updated it. Hopefully will fix the issues with timelapse.It's got high speed capture too.Basically was the only camera 2 years ago that had 24mm wide angle, great HD video, high frame rate options, and pocketable.Shame it doesn't charge from USBDave.
Struts problem report : EEVBLOG forum - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: January 14, 2013, 01:42:25 am
content: .

author: free_electron
author_rank: Super Contributor
timestamp: January 14, 2013, 01:52:51 am
content: i've een that also a couple of times today. has something to do with the banner...

author: JoannaK
author_rank: Frequent Contributor
timestamp: January 14, 2013, 06:50:01 am
content: No-one should be having Java (not even serve side) allowed and running at the moment. There's way too many bugs in it and there's wild exploits and hacks.Appartently Corel just fixed one zero.day exploit, but AfaIk it was not good enough.

author: EEVblog
author_rank: Unknown
timestamp: January 14, 2013, 07:03:24 am
content: Yep, I've seen a few banner errors from SupplyFrame too. Something up with their server again I suspect. Happens occasionally.Dave.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: January 14, 2013, 10:26:27 pm
content: QuoteThe exploits use java browser plugins to infect your JRE.So turn off Java plugins (applets) in your browser and you should be relatively safe.Well at least as safe as using flash, javascript, python ruby etc.The exploit does not directly effect:javascript, serverside struts, apache, eclipse, Open Office or Minecraft.that said the error message might have had something to do with server side upgrading in order to fix non existent exploits because management decreed it.
EEVblog #403 - IR Thermometer Calibration Testing - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: December 26, 2012, 08:49:05 am
content: Dave.

author: Unknown
author_rank: Unknown
timestamp: December 26, 2012, 11:14:20 am
content: so, for electronic purposes it's better have a cheap thermo camera, but if you have to scan an entire facility you probably need an expansive one, right?
Upgrade file links - Page 1
Forum section: electronics / general

author: spelunker
author_rank: Contributor
timestamp: December 23, 2012, 11:04:16 pm
content: Quote from: Arp on December 06, 2012, 06:22:00 pmHello,I used the links from the quoted post above.Also followed page 1Did the upgrade the the manual way. The "automatic" produced an error, so I quit it and went to the manual method.Ran all on win 7 x64. Not certain if the auto method failed because of x64 O.S. or not.Either way, end result was achieved.George
How to reduce leakage current by design for medical grade toroidal transformer  - Page 1
Forum section: electronics / general

author: yoganand
author_rank: Newbie
timestamp: December 13, 2012, 11:38:53 am
content: Hi all,I need to design low leakage current for medical grade transformer. If anybody in the loop pls help me.Transformer specification : Primary 120V/60Hz, Secondary 120V/1000VA....leakage current < 50µA...Advance thanks for your help.

author: tom66
author_rank: Super Contributor
timestamp: December 13, 2012, 01:26:43 pm
content: Low leakage here presumably means SAFETY FIRST.So why are you asking on a public forum where any idiot, such as myself, can give you a silly answer?

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 13, 2012, 02:20:49 pm
content: Quote from: tom66 on December 13, 2012, 01:26:43 pmIn the wrong section, with only one post?Because the primary and secondary are the same voltage I assume it's an isolation transformer..*googles 1000va isolation transformer*First result:Code:SXKK3535 - ISOLATING TRANSFORMERS - RPG[url=http://www.radioparts.com.au/ProdView.aspx?...1000VA+ISOLATI]www.radioparts.com.au/ProdView.aspx?...1000VA+ISOLATI...1000VA ISOLATION TRANSFORMER, MEDICALLY APPROVED, SINGLE ...Specifically designed toroidal transformers to meet themedical requirements of IEC ...wut.
#234 - Page 1
Forum section: electronics / general

author: obsoletemac
author_rank: Newbie
timestamp: January 05, 2013, 02:41:45 pm
content: Will there ever be areviewof the U1733C?I feel that an LCR-meter could come in handy, and an Agilent should be excellent, but I want to see Dave give it a thumbs up first!Is the USB-adapter identical across all Agilent handheld devices?//c

author: EV
author_rank: Frequent Contributor
timestamp: January 05, 2013, 04:01:56 pm
content: Quote from: obsoletemac on January 05, 2013, 02:41:45 pmNo, multimeters have their own adapter.

author: obsoletemac
author_rank: Newbie
timestamp: January 12, 2013, 09:09:16 pm
content: @EVNo bonus for brand loyalty there
Job Interview apparel tips - Page 1
Forum section: electronics / general

author: jh15
author_rank: Frequent Contributor
timestamp: November 30, 2012, 07:56:16 pm
content: I tried your tip of showing up for a job interview in my lab coat yesterday. It really seemed to generate a positive review (even though it is a Faraday coat). We'll see...

author: free_electron
author_rank: Super Contributor
timestamp: November 30, 2012, 07:57:47 pm
content: If you are going for a job as digital designer : wear flipflop's ...

author: EEVblog
author_rank: Unknown
timestamp: November 30, 2012, 08:00:47 pm
content: Dave.

author: ftransform
author_rank: Frequent Contributor
timestamp: December 01, 2012, 06:44:09 am
content: how about a fake beard with analog components sticking out of it?though a beard is not ESD safe... maybe just resistors

author: free_electron
author_rank: Super Contributor
timestamp: December 01, 2012, 08:17:03 am
content: Quote from: ftransform on December 01, 2012, 06:44:09 amAh, the Bob Pease look ...
EEVblog #387 - Oscilloscope Trigger Jitter - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: November 19, 2012, 10:48:24 am
content: Dave.

author: nixxon
author_rank: Frequent Contributor
timestamp: November 19, 2012, 10:38:33 pm
content: The first wave of the CH1 waveform seemed to have a tad higher voltage peak than the rest of the waves, so a possible 4th way to avoid major jitter could possibly be to increase the trigger level to just below 2.39 volts (4.78 Vpp/2).This could be a solution if you use an old, analog scope without high tek standoff, pulsewidth stuff or if there were no sync pulse available.
EEVBlog #372 Fluke 27FM - Page 1
Forum section: electronics / general

author: mzacharias
author_rank: Frequent Contributor
timestamp: November 19, 2012, 01:52:20 am
content: I'm pretty sure my old grey one had an instantaneous latched continuity test. I don't have mine anymore. Can anyone confirm this? Dave's newer one has a slow continuity test, but I'm pretty sure the old ones were more typical Fluke in this regard.

author: grenert
author_rank: Frequent Contributor
timestamp: November 19, 2012, 02:08:59 am
content: Y'know, I thought the exact same thing when I saw the video. However, when I tried mine out, sure enough, it was pokey, just like Dave's. Memory hides imperfections
How To Select And Use Ferrite/Nanocrystalline(1) - Page 1
Forum section: electronics / general

author: szhighstar
author_rank: Contributor
timestamp: November 11, 2012, 10:57:00 pm
content: INTRODUCTION:COMMON MODE CHOKES.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 12, 2012, 07:35:45 am
content: Copied from here.http://www.coilws.com/index.php?main_page=index&cPath=208_211_250I don't know, but this smells pretty spammy to me...
blog 183=Soldering - Page 1
Forum section: electronics / general

author: LAZLOT
author_rank: Contributor
timestamp: October 29, 2012, 06:25:54 am
content: When soldering a through-hole IC, I first solder two diagonally opposite pins, then push the IC into place while re-heating the two pins (one at a time, of course). I believe this to be important especially when mechanical vibration may be an issue. After the other pins are soldered then I retouch the first two pins with a TINY amount of solder to ensure a good connection. Also you forgot to mention over-heating that can remove the pad from the board.
EEVblog #180 - Soldering Tutorial Part 1 - Tools- micro shears? - Page 1
Forum section: electronics / general

author: Kidsam
author_rank: Contributor
timestamp: October 17, 2012, 03:16:21 pm
content: Anyone know a shop in AU that stocks micro shears/flush cutters?in this video dave mentions you can get them for around $10, and i've looked through a couple different shops to try find a pair, bunnings, supercheap auto, and ebayand the only pair i could find was a no-name brand one on ebay that was worth less than the postageany ideas for shops in AU that might sell them?
Tektronix 460A oscilloscope problem. - Page 1
Forum section: electronics / general

author: stratogazer
author_rank: Contributor
timestamp: October 08, 2012, 10:07:41 pm
content: Hi, all. Hope you can help me. I have a Tektronix 460A scope I bought used. All self tests pass. all waveforms generated internally look as they should.The problem occurs when I try to measure a waveform made by something else - a battery operated voltage controlled oscillator for example. The VCO generates triangle and square waves. I see the wave form but SUPERIMPOSED ON TO A 60 HZ SINE WAVE. In fact, everything I try to measure is on top of the 60 HZ sine wave.I replaced the input filter. This had no effect. I inspected the power supply PCBs. There is no obvious signs of damage. The house AC is well grounded as is the scope. What else should I check??Thanks in advance.

author: SeanB
author_rank: Super Contributor
timestamp: October 09, 2012, 04:38:30 am
content: Probe ground lead open circuit? Check continuity of the probe to the scope case, and from the tip to the centre set to X1.

author: stratogazer
author_rank: Contributor
timestamp: October 10, 2012, 10:10:51 pm
content: I checked the probe continuity as you suggested. The ground clip has good continuity as does the probe tip to the input connector inside. The ground clip has continuity all the way back to the AC socket.Any other ideas? Appreciate all suggestions. Thanks in advance.

author: TerminalJack505
author_rank: Super Contributor
timestamp: October 10, 2012, 11:11:51 pm
content: You are connecting the ground clip to your circuit's ground, right? And have the scope switched to DC coupling?

author: stratogazer
author_rank: Contributor
timestamp: October 12, 2012, 01:23:28 am
content: Yes, I've tried connecting the ground clip to earth ground, circuit ground, case ground, any ground I can reach - same result.About the DC coupling, I'm not sure. I'll have to check to make sure.Thanks very much for the suggestion.

author: stratogazer
author_rank: Contributor
timestamp: October 14, 2012, 11:18:25 pm
content: Thanks TerminalJack! That was exactly the problem! When the 460A powers up the status page indicates that it is DC coupled. HOWEVER! Upon selecting the "triggering" page I found the scope was, in fact, using AC coupling. When I switched it to DC coupling the scope worked as it should. Pays to double check. Thanks again for the solution.
EEVBLOG #38 - LCR Meter - Page 1
Forum section: electronics / general

author: chrisjn52
author_rank: Newbie
timestamp: September 26, 2012, 05:10:16 pm
content: can anybody recommend a source of reference material on the LCR Meter technique outlined in Blog #38?I am haven't quite grasped the principle described.

author: lcr1
author_rank: Newbie
timestamp: October 12, 2012, 12:43:23 pm
content: Chris, You can download LCR meter guide athttp://www.ietlabs.com/notes/lcrprimerHopefully this is helpful in better understand LCR meter theory of operation.Sincerely,

author: robrenz
author_rank: Super Contributor
timestamp: October 12, 2012, 02:00:41 pm
content: Thanks for that great link lcr1 and welcome to the forum. You may want to visit this thread if you have not already.https://www.eevblog.com/forum/beginners/generating-a-100khz-square-wave/msg152569/#msg152569welcome chrisjn52 also.
EEVblog #367 - Live Show 8th Oct 2012 - Page 1
Forum section: electronics / general

author: LEECH666
author_rank: Frequent Contributor
timestamp: October 08, 2012, 07:57:32 am
content: Because some people asked in the live show how to get rid of the Ustream ads:Extension forChromeBrowserhttp://adblockplus.org/en/chromeExtension forFirefoxBrowserhttps://addons.mozilla.org/en/firefox/addon/adblock-plus/Extension forOperaBrowserhttps://addons.opera.com/en/extensions/details/opera-adblock/?display=enIt's less advanced, but works well enough.Extension forInter ExplorerBrowserAdblock IENo link since I've not tested this one, v1 seems to be free, v2 seems to be a premium (paid) extension.These Ad-blockers work for Youtube and general ads (Intellitext style in-text markup ads, annoying hover ads that hover over the web page, etc) too.In general I can say that, even tho they interfere with some web pages sometimes, it's worth to have one of these installed. They make the web a better, cleaner and easier to use experience.Florian

author: tom66
author_rank: Super Contributor
timestamp: October 08, 2012, 03:45:02 pm
content: I agree - I don't go anywhere without Adblock Plus on Chrome or Firefox.I of course disable it on sites I value such as EEVBlog and the Youtube channels I subscribe to.But the continuous and obnoxious advertising elsewhere - it's gotta go!

author: TerminalJack505
author_rank: Super Contributor
timestamp: October 09, 2012, 12:08:53 am
content: Thanks. I haven't used an ad blocker before but the ads are simply getting obnoxious anymore. I'll try it out.

author: LEECH666
author_rank: Frequent Contributor
timestamp: October 09, 2012, 02:26:56 am
content: Obnoxious is the cue.There are so many pages that are such a poor user experience simply because the hovering flash adds just don't work, or because they completely black access to a web page unless you click it. And many of these ads open a pop up anyway no matter where you click (for example the close button). I don't mind lean ads that don't try to force themselves onto you.
EEVblog #358 - Electronex 2012 - Page 1
Forum section: electronics / general

author: naimis
author_rank: Contributor
timestamp: September 23, 2012, 05:36:50 pm
content: Just wanted to say "thanks" to whoever ended up putting the pink feathered boa out there (presumably it was on Dave's cardboard avatar, though he didn't mention that)... You totally made my day

author: nitro2k01
author_rank: Frequent Contributor
timestamp: September 23, 2012, 06:48:38 pm
content: Video link:

author: T4P
author_rank: Super Contributor
timestamp: September 24, 2012, 04:41:57 am
content: Lol thermaltronics ... Those metcal copies most here knows
EEVblog #286 - Orders of Magnitude - Page 1
Forum section: electronics / general

author: tekati
author_rank: Contributor
timestamp: June 05, 2012, 11:56:14 pm
content: Pretty cool topic and here is a PDF of a chart taken from wikipedia.I like to take things like this and laminate them and create cheat sheets for the wall.

author: NiHaoMike
author_rank: Super Contributor
timestamp: June 06, 2012, 04:42:39 am
content: http://en.wikipedia.org/wiki/Book:Orders_of_magnitudeAs a note, 32-bit integers support about 9 orders of magnitude and 64-bit integers about 19. Floating point uses the bits a little differently - a 64-bit float (double) supports 16 orders of magnitude precision and can work in a space of 616 orders of magnitude.

author: notsob
author_rank: Frequent Contributor
timestamp: June 09, 2012, 01:07:41 pm
content: WHOSE ONE  BILLION do you ACCEPT and should we be encouraging the Media to use metric identifiers for the $dollarthe Original "billion" was english and was 1 million x 1 million - ie 10 to the 12th power - 1,000,000,000,000today we seem to accept the american version of 1000 x 1 million - ie 10 to the 9th power - 1,000,000,000Personally- I would prefer a campaign to encourage all [ including the media] to make a significant change, which clears the confusion.ie Giga dollars = $ x 10 to the power 9th power, Mega dollars = $ x10 to the power of 6, and of course Tera dollars [look it up]Why, well as dave refers to crappy product from a certain area as 1 hung low, I get pissed with TV news [mentioning BILLION] when it has no real reference

author: EEVblog
author_rank: Unknown
timestamp: June 09, 2012, 01:24:38 pm
content: Quote from: notsob on June 09, 2012, 01:07:41 pmAustralia and many other countries including the UK use the Short Scale (10^9)http://en.wikipedia.org/wiki/Short_scaleDave.

author: G7PSK
author_rank: Super Contributor
timestamp: June 09, 2012, 10:14:23 pm
content: Another one of Harold Wilson's little scams. Borrow a Billion pounds long scale and pay back the billion short scale.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 21, 2012, 03:13:11 am
content: Man walks into a bar and says to the bartender, "Give me ten times the number of drinks everybody in here is drinking."The bartender says, "Now that, my friend, is an order of magnitude."
EEVblog #37 - Rigol DS1052E Oscilloscope Teardown - Page 1
Forum section: electronics / general

author: SpiderElectronics
author_rank: Contributor
timestamp: August 21, 2012, 08:30:58 am
content: Hi everyone,I just bought a DS1102E here in the UK for less than £300 (excl VAT). It's a great scopefor the price.I have watched #37 a few times now, and it was a major factor in me buying this scope.I wonder if that 40PIN header that Dave ponders about might be a header for the Logic Analyzer which is the difference between a DS1xxxEand a DS1xxxD.If so, I wonder does anyone know if it is possible to upgrade an 'E' to a 'D' by simply fitting a duaghter card in, and a connector for the front panel?I must admit I have never seen the 'D' version and have no idea if it is any good or not, or what other internal differences there might be.RegardsKenny.

author: misisoso
author_rank: Contributor
timestamp: September 19, 2012, 08:39:53 am
content: Hi,Yes, that 40 pin header is header for LA.I do not think it is possible to upgrade it with a card... They left unpopulated places on the PCB, where should go the devices for handling the LA logic. You should have bought the D version.Misisoso
silicon chip  - Page 1
Forum section: electronics / general

author: blackjames
author_rank: Regular Contributor
timestamp: September 14, 2012, 09:53:51 am
content: hi, i watched the video where dave interviewed the people at the silicon chip stand. does anyone happen to know where they said that they got their prototype pcbs made? (not their production pcbs from china)

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 14, 2012, 10:21:44 am
content: Some place in Newport?

author: blackjames
author_rank: Regular Contributor
timestamp: September 14, 2012, 10:26:48 am
content: i tried searching stuff like 'newport pcb' on google, and i got nothing useful.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: September 14, 2012, 12:12:06 pm
content: It was typical Leo double speak. Question caught him off guard. It would seem that we will probably never know.Mr. Simpson in a million years would never logon here and throw his weight around.Edit: typo in name. Apologies.

author: EEVblog
author_rank: Unknown
timestamp: September 14, 2012, 12:27:53 pm
content: I have recollection of a one-man-band company called Instant PCB's around that area. Used to or still does advertise in SC.He used to make only tin plate boards using some home made process.I don't know if it's the same one.Dave.

author: blackjames
author_rank: Regular Contributor
timestamp: September 15, 2012, 04:00:53 am
content: i have bought prototype boards from circuit labs, and they were good quality and reasonably low cost. I'm just curious. it doesn't really matter
EEVblog #348 - Electronex 2012 - Behind the Scenes  - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: September 11, 2012, 09:31:59 pm
content: I don't know if you noticed it, but your booth was larger than Altium's!Alexander.

author: Alana
author_rank: Frequent Contributor
timestamp: September 11, 2012, 09:58:25 pm
content: And i see that Dave is damn proud of it.

author: xyzzy
author_rank: Contributor
timestamp: September 11, 2012, 10:30:02 pm
content: Dave:Any chance you'll either offer those rulers for sale or release the Gerber files for them? Great Scott they look cool, but unfortunately I'm 9300 miles from Sydney.Also, I heard a rumor that your booth is bigger than Altium's. Any truth to that?

author: SeanB
author_rank: Super Contributor
timestamp: September 12, 2012, 04:56:26 am
content: Add to that I see you have a full time booth man as well, though he does not speak much to the visitors.

author: kaindub
author_rank: Regular Contributor
timestamp: September 13, 2012, 09:56:17 am
content: Who visited Dave at his booth?I was there on Thursday at lunchtime. I swear Dave's stand had more people around it than the trade stands. What does that say about trade shows?Anyway I said the secret words to Dave, and he whipped out some rulers (in all three colours) and then asked if I wanted an LCD display. Never to knock back a free offer, I of course obliged.I was somewhat surprised to get a handful (six?) displaysMany thanks Dave!And yes, Dave is a real person. I managed to have a short chat with him, and he's just like the video character.Met his lovely wife and Sagan as well.Worthwhile going to the show just to meet Dave.I hope they can import him to Melbourne next year for the Mexicans

author: EEVblog
author_rank: Unknown
timestamp: September 13, 2012, 11:19:02 am
content: Quote from: kaindub on September 13, 2012, 09:56:17 amThe Makerbot sucked them all in!QuoteThat's because I don't play a characterQuoteWill almost certainly be at the Melb show next year, gig or no gig.Good to meet you, thanks for dropping by!Dave.
Livestream request - Page 1
Forum section: electronics / general

author: Flunze
author_rank: Regular Contributor
timestamp: September 03, 2012, 07:15:59 pm
content: I just wanted to know, whan and/or if Dave will make a Livestream. I'd like to see it, that'd be cool.

author: EEVblog
author_rank: Unknown
timestamp: September 03, 2012, 09:35:38 pm
content: I have one of those remote pan/tilt webcam things, but I'm buggered if I can get the stupid thing to work with the outside world yet...Dave.

author: Mikey
author_rank: Regular Contributor
timestamp: September 03, 2012, 11:28:06 pm
content: Quote from: EEVblog on September 03, 2012, 09:35:38 pmTime to hack it?I got an old Sony PCS-1600 conference camera, managed to poke enough around with it to be able to use it as webcam, and even be able to control the pan tilt and zoom (yay, real optical zoom) from my webcam site

author: Flunze
author_rank: Regular Contributor
timestamp: September 04, 2012, 04:31:18 am
content: I hope, you will get it done. And than I also hope, I will have the time. If you do a Stream at 9Am, I would have time.Well, it is Difficult in germany, also I have a job. I hope, I can make it.

author: EEVblog
author_rank: Unknown
timestamp: September 04, 2012, 08:51:41 am
content: I can always just use a regular webcam and have a dedicated notebook running for it.In fact that's better, because Ustream handles the load sharing.Dave.
Where did the electric bike video go? - Page 1
Forum section: electronics / general

author: mux
author_rank: Regular Contributor
timestamp: August 24, 2012, 10:31:21 am
content: Although the bike was awful compared to more modern designs, it was a great video to highlight how far we have come since the heyday of electric bikes (where you had to do everything DIY). I wanted to show somebody your video about the electric bike with the humongous battery, comically sized in-wheel motor and wires running all over the place when I found out it's gone! Why? It's one of the few videos on youtube with this set-up.

author: Mint.
author_rank: Frequent Contributor
timestamp: August 24, 2012, 11:25:24 am
content: Yeah, a few vids are missing for me too.

author: EEVblog
author_rank: Unknown
timestamp: August 24, 2012, 11:34:48 am
content: Read the video description.Those two videos have been removed at the request of the school. They will be back up when I get the word it's ok (after exams are complete).Dave.

author: mux
author_rank: Regular Contributor
timestamp: August 24, 2012, 12:27:45 pm
content: Well, the problem with reading video descriptions is that those videos kind of need to be accessible to read or view anythingSo I had no way of knowing what happened.

author: EEVblog
author_rank: Unknown
timestamp: August 24, 2012, 12:38:32 pm
content: Quote from: mux on August 24, 2012, 12:27:45 pmI have a blog website, and TwitterDave.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 26, 2012, 07:09:00 pm
content: That would be more accurately described as a plug in hybrid bicycle, since it still has the pedals.
EEVblog #332 - Mantis Elite Microscope Scratch'n'Sniff - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: August 11, 2012, 07:42:55 am
content: Dave.

author: PeteInTexas
author_rank: Frequent Contributor
timestamp: August 14, 2012, 05:06:44 am
content: From the looks of the arm, it seems like you can't move the head to all points on a plane parallel to the table without refocusing. This seems inconvenient for big boards that are clamped down for soldering.

author: EEVblog
author_rank: Unknown
timestamp: August 14, 2012, 05:25:28 am
content: Quote from: PeteInTexas on August 14, 2012, 05:06:44 amNot in the Y-Axis, no. In the X-Axis, or an X-Axis arc, yes.Dave.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 16, 2012, 10:10:52 pm
content: That is a limitation of the cheaper mantis units. You basically get an arc of coverage on the bench, with only a small change in radius with up/down to focus. In practice this isn't a big problem as that thing you are looking at can be moved into the working area.They do make some fancier arms if you really need more flexibility.

author: Trevor Matthews
author_rank: Newbie
timestamp: August 22, 2012, 10:26:55 am
content: Hi DaveJust registered as I don't know if you saw my message left on the video.I have just released a review of the Elite and thought it might be useful to you and your followers, like meThe review can be download fromhttp://www.mediafire.com/view/?l86zku3zk5hi46xIt is 2.2Meg so I can't attach it here.One of the other arms may be far more suitable depending on your uses.regardsTrevorTelevision-Magazine-Forum UK

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: August 22, 2012, 11:38:20 am
content: How do you drown a blonde? Put a scratch'n'sniff sticker at the bottom of a pool.
PFC inductor design guide - Page 1
Forum section: electronics / general

author: szhighstar
author_rank: Contributor
timestamp: August 26, 2012, 08:43:37 am
content: PFC inductor design guide1, selection core:We should be know below necessary information:(a) Minimum Inductance based on DC basic, e.g. 1mH(b) IDC current, e.g. 3AAccording to formula LI*I= 1.0*3.0*3.0=9.0We can find 60u which is in range from curve which is LI*I vs core part number, and find core55586 is suitable .Inductance factor of 55586 is 38uH/N*N+/-8%, so lower limit is 34.96uH/N*NFor meeting 1.0mH, it needs to wind 169Ts, according to formula IN=HL, get H is 56.6A/cm, wecontinue to review curve which is DC vs initial permeability, can find initial permeability at DCcurrent is 68% than initial permeability at 0A, so we adjust turns from 169Ts to 249Ts.2. wire selectionWe select AWG#20 when current is 3.0A, due to big current and high temperature raise, we usePEW or EIW wire, which temperature rate is 180 degree and reinfore insulation, ensure not shortbetween wire and wire.3. Verify design result249Ts AWG#20 is equivalent 157.9mm*mm, winding factor is about 39%, total area of windowis 401mm*mm.Minimum inductance at 3.0DCA is 1.04mH.4.Configuration designBecause PFC inductor is heavy and coil is big, we advise to add base, and full fix coil and baseusing epoxy glue, design pin pitch according to PCB of customer.5.Reliability testingWe run high temperature and low temperature testing, ensure the inductor can bear high and lowtemperature.6. Electrical parameter testingL at oAL at DC currentDCR for coilImpulse voltage testing for winding.see below curve drawing.see below curve drawing.

author: amyk
author_rank: Super Contributor
timestamp: August 26, 2012, 09:05:31 am
content: ...you want Dave to do an episode on designing PFC inductors?

author: s_lannan
author_rank: Contributor
timestamp: August 26, 2012, 10:50:46 am
content: Yeah I bet they do that for the SMPS that keep blowing up in our products from china lol

author: szhighstar
author_rank: Contributor
timestamp: August 26, 2012, 12:09:49 pm
content: Hi s_lannanDo you think my design is not right? if yes, please help to teach me, I am glad to study.Yes, I am in China, we designed and made many and many PFC inductors. even if these PFC inductors happened quality question, however never burnt SMPS.
EEVblog #320 - Mailbag Monday - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 23, 2012, 10:59:35 pm
content: Dave.

author: freddyk
author_rank: Newbie
timestamp: July 24, 2012, 12:45:41 am
content: Hi Dave,I'm the one who donated the PDAs.The iPAQ battery had started to bulge and would no longer fit in the battery compartment so I recycled it.../Fredrik

author: m12lrpv
author_rank: Regular Contributor
timestamp: July 24, 2012, 01:35:01 am
content: I love the Psion.I chose to program one of them as part of the thesis project for my surveying degree way back when.It was a fantastic bit of kit and was a real shame to have to hand it back to the Uni when I was done.

author: free_electron
author_rank: Super Contributor
timestamp: July 24, 2012, 01:42:08 am
content: ah.. the white breadboard problem. there's at least 4 different pin pitches out there for the power rail connections...an a true Psion... hilarious.. spreadsheet on a 2x16 char alpha lcd.... that has to be maximum usability.

author: bradleytron
author_rank: Regular Contributor
timestamp: July 24, 2012, 03:46:23 am
content: DaveThanks for the great videos. Regarding the package with the stamps, I think they may be a rendering of a butterfly wing.

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 24, 2012, 08:03:05 am
content: What are the other packages? Why didn't you open them? Not enough time?Should be a bunch of step down converters in the mail, I just want to see what the ripple is like on them at Max rated current.

author: Psi
author_rank: Super Contributor
timestamp: July 24, 2012, 08:18:15 am
content: Quote from: peter.mitchell on July 24, 2012, 08:03:05 am?He said he had two packages and opened two packages.

author: IanB
author_rank: Super Contributor
timestamp: July 24, 2012, 02:03:38 pm
content: Quote from: Psi on July 24, 2012, 08:18:15 amWatch more carefully. He had four packages and opened two of them to prevent the video becoming too long.

author: Psi
author_rank: Super Contributor
timestamp: July 24, 2012, 02:15:11 pm
content: i reject your reality and substitute my own

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 26, 2012, 02:30:41 am
content: Intel sold the Xscale division to Marvell. They did that because they came up with their own design that gives superior performance and competitive efficiency. Not surprisingly, the Atom's internal design is similar to that of ARM's.http://www.anandtech.com/show/5365/intels-medfield-atom-z2460-arrive-for-smartphones/2

author: EEVblog
author_rank: Unknown
timestamp: July 26, 2012, 04:29:27 am
content: Quote from: IanB on July 24, 2012, 02:03:38 pmCorrect, the video was already going to be long enough. 4 packages would have been too many.Trying to spread the love around...Dave.

author: T4P
author_rank: Super Contributor
timestamp: July 26, 2012, 08:11:51 am
content: Quote from: NiHaoMike on July 26, 2012, 02:30:41 amso that's how the FPU performance on ARM is similar to a PIII!*Mind you, the original Atom is based on the PIII
Dazhenz PS-1305 power supply build quality - Page 1
Forum section: electronics / general

author: e100
author_rank: Frequent Contributor
timestamp: July 14, 2012, 04:53:24 am
content: If you have one of these I would recommend that you have a look inside before you next use it. It may save you from electrocution.http://www.aliexpress.com/item-img/Brand-New-PS1305-DC-Regulated-Variable-Power-Supply-30V-Softkey-Wholesale-retail/299256590.htmlCheck the wiring close to the mains switch on the front panel.On mine there was a heat damaged ribbon cable on the low voltage side resting against the bare mains voltage connector on the power switch. There were blobs of solder still stuck to the ribbon cable insulation from when the soldering iron touched it.I only found this by accident because out of the box it wasn't working because one of the internal non latching signal connectors has fallen off in transit. That was easily fixed, but the build quality for the rest varies between OK and truely terrible.For example, the voltage and current pots case tags hadn't been soldered and there was flux gel still on the board.The voltage reading was out of spec. I'm going to pull it all apart inspect, clean and reassemble before I try using using it for anything.Mike

author: T4P
author_rank: Super Contributor
timestamp: July 14, 2012, 07:09:39 am
content: It's a bit pricey for what seems to be synonymous with other OHLJ PSU's

author: e100
author_rank: Frequent Contributor
timestamp: July 14, 2012, 08:31:59 am
content: Quote from: DaveXRT on July 14, 2012, 07:09:39 am$150 on Ebay plus shipping (it's heavy). I got it because of the 1mA current resolution and bright display. Most PSU in the same price range only have a 10mA resolution.I put it back together and it's working OK. The fan is always on and is annoying. When you disable the output, the current and voltage displays go to zero which means you cannot set the limits off line. The control circuitry looks all analog with only the display being digital. I guess power supply designs like this are as old as the hills.

author: T4P
author_rank: Super Contributor
timestamp: July 14, 2012, 09:29:42 am
content: Yeah sure, there's 10mA model on totobay for only 47.08 w/o shippingAnd the shipping isn't really alot.

author: beltal
author_rank: Newbie
timestamp: July 19, 2012, 08:35:49 am
content: you can buy it with Paypal and cheaper price athttp://www.beltal.com/dhgexpress?uri=/product-fm/299256590-Brand-New-PS1305-DC-Regulated-Variable-Power-Supply-30V-Softkey-Wholesale-retail-wholesalers.html

author: nitro2k01
author_rank: Frequent Contributor
timestamp: July 19, 2012, 10:19:52 am
content: Totally not spam, what are you talking about?
EEVblog #312 - Photocopier Teardown Follow-up - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 15, 2012, 12:58:16 am
content: Dave.

author: interoth
author_rank: Contributor
timestamp: July 15, 2012, 01:00:23 am
content: Those optical sensors would be useful in a coil gun.

author: aokman
author_rank: Contributor
timestamp: July 15, 2012, 01:29:30 am
content: those photosensors are common in every photocopier type machine. Its funny actually how similar the designs are to our machines...Those steppers are very handy i have a box full of them, the only problem with photocopier ones is they are all custom in terms of current draw, step rate, phase, shaft diameter etc which means you would need to tear apart multiple machines of the same type to get enough.But you do score sometimes, i managed to get an optical scanner stepper motor from one of our machines that is a high precision 0.6deg step typeended up hacking the existing driver board with a simple clock driver to control the focus on my telescopeI have to say using the existing boards are great as if you get the wiring diagram you can find all the inputs such as frequency>forward>backward>halfstep A>halfstep B> full stepping>motor lock
EEVblog #309 - Mailbag  - Page 1
Forum section: electronics / general

author: nitro2k01
author_rank: Frequent Contributor
timestamp: July 13, 2012, 07:48:12 pm
content: Why doesn't this episode have a thread yet? And why didn't I see it my subscription box until now? What kind of sorcery is this!

author: nitro2k01
author_rank: Frequent Contributor
timestamp: July 13, 2012, 08:05:29 pm
content: Comments:Finland is using the Euro! Just like most of Europe, except us Swedes, the Danes and of course that Old Dart. And of course Norway and Switzerland who are too cool to even join the Union, but I digress.Just to shed some light and that weird web address. We used to have second level domains for each municipality before 2003. This system was a pain, so it was abandoned. And so that device must be old as dirt. M means Skåne, right down at the southern tip of Sweden.And I'm disappointed that we didn't get to see a super quick pulse generator test with the probe.

author: icon
author_rank: Regular Contributor
timestamp: July 13, 2012, 09:21:48 pm
content: Quote from: nitro2k01 on July 13, 2012, 08:05:29 pmWounded - probably mid 2000's. And it worked fine on a Canon MV5imc and Sony HC42. I blame Dave's shonky modern camera.And 'castles'? Sheesh. Noob. Top left is Aylsham church, built with wool money, and top middle is Blickling Hall, famous among other things as (possibly) the birthplace of Anne Boleyn. Not remotely fortified.John
Where to buy spare parts for uCurrent adapter? - Page 1
Forum section: electronics / general

author: king.oslo
author_rank: Frequent Contributor
timestamp: June 27, 2012, 12:58:02 pm
content: Hello everyone,I have had my uCurrent for about a month (which I love), I am one of those people who forget to switch the nice adapter off, and when I come to use it next, the battery is drained and I feel like an idiot.I have carried out a few teardowns to admire the circuitlabs pcb and a few battery-changes of the unit, and the screws which I am fastening lightly has begun to wear out the threads in the box.I would like to upgrade to metal threaded inserts, (and hack in a circuit which auto-switches the adapter off for me). So my question is, does the australian manufacturer offer boxes with threaded inserts, or perhaps Dave knows of a manufacturer whom has one which fits the PCB /w threaded inserts? Or is the simplest solution going to be to to drill oversized holes and glue in some nuts of the right diameter?Thank you for your time.Kind regards,Marius

author: notsob
author_rank: Frequent Contributor
timestamp: June 27, 2012, 01:12:23 pm
content: I have had exposure to crappy screws in project boxes, that only work (screw) a few times we replaced them with stainless steel ones,we got them from a local supplier [from memory approx 2.5mm dia ]

author: rr100
author_rank: Frequent Contributor
timestamp: June 27, 2012, 01:37:44 pm
content: What about duct tape?

author: Short Circuit
author_rank: Frequent Contributor
timestamp: June 27, 2012, 02:27:15 pm
content: Fasten them even lighter, and 'search' the start of the old thread before fastening.

author: EEVblog
author_rank: Unknown
timestamp: June 27, 2012, 02:37:09 pm
content: Sorry, no threaded option in the jiffy box range.You can use 3 x AAA's/AAA's to power it to get much greater life.Dave.

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 05, 2012, 07:57:03 am
content: Or if you really wanted long life, instead of 3x AAAs in series, use 3x 10440 LiIons in parallel with a small resistor.
EEVblog #299 – Retro Phone Camera Teardown  - Page 1
Forum section: electronics / general

author: tecman
author_rank: Frequent Contributor
timestamp: June 26, 2012, 05:24:44 pm
content: The answer on the shielding is quite simple. When the assembly is sandwiched, the (memory) chip sits directly behind the flashtube. When the flash discharges, a fast rise current, likely in the 10's of amperes flows through the flashtube. This creates a small EMP (electromagnetic pulse) which can adversely impact any number of chips. The shield is to prevent this pulse from causing any issues with the adjacent parts. You can replicate the issue if you have a photoflash (separate, external type) from a camera. Place the window up to a circuit and pop the flash. You will see significant induced voltages in the circuit (with a scope attached) and you can easily get a micro based device to hang or reboot when the flash is discharged.paul

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 26, 2012, 06:09:36 pm
content: As well as the flash discharge current, the Hv trigger pulse - maybe 1-2kv with fast risetime and minimal loading can capacitively couple to nearby circuitry

author: G7PSK
author_rank: Super Contributor
timestamp: June 26, 2012, 09:00:12 pm
content: Also both the trigger pulse and the tube discharge itself produces a broad spectrum of RF as well.

author: PeteInTexas
author_rank: Frequent Contributor
timestamp: June 27, 2012, 04:15:09 am
content: What was that under the OK5 sticker?

author: codeboy2k
author_rank: Super Contributor
timestamp: June 27, 2012, 07:10:26 am
content: would that be a quartz window over the CCD? or just glass?

author: SeanB
author_rank: Super Contributor
timestamp: June 27, 2012, 03:33:00 pm
content: Plain glass, with an antireflection coating, and probably both a UV and IR filter layer. CCD's are rather sensitive to both.
eevblog itunes proplem  - Page 1
Forum section: electronics / general

author: r
author_rank: Contributor
timestamp: June 17, 2012, 07:05:53 pm
content: eevblog number 278 will not download keep getting 404 err witch means broken link

author: EEVblog
author_rank: Unknown
timestamp: June 17, 2012, 10:05:55 pm
content: Should be fixed nowDave.

author: r
author_rank: Contributor
timestamp: June 19, 2012, 07:23:34 pm
content: gust tried to downlode it steel getting 404 err

author: EEVblog
author_rank: Unknown
timestamp: June 19, 2012, 10:41:59 pm
content: Updated again.Might be a cache issue.Can download direct herewww.eevblog.orgDave.