hybridfree/eevblog-posts huggingface dataset:
Star trek electronics schematics - Page 1
Forum section: electronics / general

author: hanndoddi
author_rank: Contributor
timestamp: February 21, 2013, 07:37:30 pm
content: Okey this might be a bit nerdy but does any one know if there's any electronics schematics for star trek.It would be funny to print them out and have them laying around in the lab.I found this link it has a lot of blueprints but does not have any electronics if any one knows about it please sharehttp://www.cygnus-x1.net/links/lcars/blueprints-main2.php

author: andyturk
author_rank: Frequent Contributor
timestamp: February 21, 2013, 08:37:28 pm
content: Seriously nerdy. I had those blueprints up on my bedroom wall as a kid.Here's a schematic for theTricorder

author: Zad
author_rank: Super Contributor
timestamp: February 21, 2013, 08:53:44 pm
content: I totally deny having the original 1701 blueprints in a vinyl folder. And the Star Fleet Medical Reference Manual.A mate of mine at school did have the Star Fleet Technical Handbook, which had the schematic diagram for a "communicator" which was basically a walkie-talkie. From what I remember it was about 6 or so transistors, no ICs. All very 1970s. I still coveted it though.

author: Len
author_rank: Frequent Contributor
timestamp: February 21, 2013, 09:49:42 pm
content: Quote from: Zad on February 21, 2013, 08:53:44 pmMe too! um, deny it, I mean.

author: baljemmett
author_rank: Unknown
timestamp: February 21, 2013, 10:45:17 pm
content: Quote from: Zad on February 21, 2013, 08:53:44 pmIndeed; I wonder if I still have that somewhere. I suspect it'd be quicker to spend a few minutes asking Google where a .pdf might be found than to go digging around in boxes looking for it, though...[Edited to add: heh, no point even bothering with Google -- it'savailablefrom the site the OP linked, along with the rest of the manual by the looks of it!]

author: Homer J Simpson
author_rank: Super Contributor
timestamp: February 22, 2013, 02:32:15 am
content: I had the 1701 blueprints in the vinyl folderThad had to have been about 1978 or 79.Wow.

author: jh15
author_rank: Frequent Contributor
timestamp: February 22, 2013, 05:37:54 am
content: I have the Technical Manual, just yesterday I was about to put something on top of it on the shelf, I think my Systron Donner 7014d3n nixie tube frequency counter, then noticed it in time to not damage it.Notice in the "Japanese transistor radio with the white thing that hurts when you put it in your ear" communicator, it shows "led's" with incandescent lamp symbols.I think when I got my book as a birthday gift, I had just come home from a North East Research and Engineering Meeting (expo). With two incredibly futuristic red led samples I showed to my mom.The tricorder diagram shows a CRT as does the prop on tv.Also they were into through-hole soldering. Maybe Scottie had problems too, soldering smd.I said "you are looking at the future of lighting". This was even before the first energ crisis, and I was thinking only of indicators...
Iran now has its own version of youtube - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: February 23, 2013, 02:28:53 pm
content: Iran put up its own version of youtube.Watch , how in great detail, they instruct children on how to buy a book bag, complete with a doctor talking to the kidshttp://ir.mehr.ir/Multimedia-1-3172.aspx

author: opablo
author_rank: Regular Contributor
timestamp: February 23, 2013, 04:51:57 pm
content: I heard that the pr0n industry also made it''s own version of youtube. The intertubes are crazier every day...(I'm not making fun of you; don''t get me wrong; its just a joke)Speaking of own versions of X... anybody uses the GLONASS system ? is it as good as the GPS one ?

author: GeoffS
author_rank: Unknown
timestamp: February 24, 2013, 03:18:40 am
content: Quote from: ptricks on February 23, 2013, 02:28:53 pmIt'll never catch on until they have videos of cats.
PHYSnet - Page 1
Forum section: electronics / general

author: olsenn
author_rank: Frequent Contributor
timestamp: February 21, 2013, 02:07:27 pm
content: I just discovered a wonderful collection of puclic domain scientific documents which I thought you might like; here it is:http://www.physnet.org/modules/pdf_modules.html

author: mswhin63
author_rank: Frequent Contributor
timestamp: February 22, 2013, 12:55:45 am
content: Nice find very nice thanks

author: TerraHertz
author_rank: Super Contributor
timestamp: February 22, 2013, 01:14:58 am
content: Oh. For a moment I was all excited, and firing up Teleport to make a local copy.Then tried reading some of the sections. Sadly, the chapters are just very brief summaries of key points in external reference works, and some exercises (that also reference the external works.)It doesn't try to be a self-contained learning resource on the topics listed.Still useful though.
EMC Pre-Compliance - Spectrum Analyser Overloading - Page 1
Forum section: electronics / general

author: David
author_rank: Frequent Contributor
timestamp: February 21, 2013, 04:51:50 pm
content: Hi all,We have purchased a Rigol DSA815-TG (with EMI Filter) at work along with a LISN etc and have created a setup for conducted emission pre-compliance.I am analyzing a unit which is known to have high emissions at the low end (~180KHz). On the spectrum analyser I have started with 10dB attenuation and then increased this to 30dB (Rigol max), however I have noticed that the signal level increases with the increased attenuation! My knowledge is limited but I believe this is because the analyser is being overloaded? If I were to use an external attenuator in addition to the inbuilt one would this solve my problem? (increasing attenuation until the signal level does not change?). Is this to do with the dynamic range of the SA?Cheers,Dave

author: deephaven
author_rank: Frequent Contributor
timestamp: February 21, 2013, 05:12:14 pm
content: Sounds likely. If you don't have an external attenuator to hand, you could try disconnecting the cable that's plugged into you LISN and verify that you're getting a believable noise floor. Then offer the cable up to the connector on the LISN and observe the gradual appearance of the 180 KHz signal. You should soon be able to assess that it is increasing in amplitude by a sensible degree as you get closer. Then, if it is an overload situation, you should see the display limit, maybe with a suddenly less noisy baseline.

author: KJDS
author_rank: Super Contributor
timestamp: February 21, 2013, 06:18:41 pm
content: If the signal level on the screen is going up as you increase the attenuation, then it is likely that whatever signal that is causing the overload isn't visible on the screen, ie it is off frequency. It's possible that this could be dc.

author: AndyC_772
author_rank: Super Contributor
timestamp: February 21, 2013, 07:56:58 pm
content: An external attenuator will do no harm, but you probably don't need to actually buy anything to prove the point. If you have a spare BNC cable, snip it in half and add a series resistor - it'll form a potential divider with the 50 Ohm input of the analyser. If you think there might be a dc offset (measure it with a multimeter!), a small capacitor in series with the lead will remove it.Are you trying to create a calibrated setup, or just make relative measurements before/after making changes to the EUT?
i want to make something! - Page 1
Forum section: electronics / general

author: ElektroTehnicar
author_rank: Newbie
timestamp: February 21, 2013, 03:56:44 pm
content: Hello Electrical Engineers!I'm 17 years old and i study electrical stuff.AND i want to make an simple project on PCB!I want to make a multivibrator to flash the 2 LEDs! PLEASE SEND ME schematics or something useful!I use ELECTRONICS WORKBENCH 5.12 but it didn't help a lot!

author: david77
author_rank: Frequent Contributor
timestamp: February 21, 2013, 04:04:20 pm
content: Google for "astable multivibrator"

author: c4757p
author_rank: Super Contributor
timestamp: February 21, 2013, 04:15:09 pm
content: The only "electronics workbench" you need to work with multivibrators and flashing LEDs is made of wood.Many oscillators, multivibrators included, can be ornery and not start oscillating in a simulation. It can take some poking and prodding to make them start.

author: deephaven
author_rank: Frequent Contributor
timestamp: February 21, 2013, 05:18:52 pm
content: http://www.jamia-physics.net/lecnotes/lab/multivibrator.pdf
Hobart Hackerspace - Page 1
Forum section: electronics / general

author: GeoffS
author_rank: Unknown
timestamp: February 20, 2013, 12:04:38 pm
content: Just attended my first meeting of theHobart Hackerspace.It's only been in operation for a month or so and is still setting up. They have a Makerbot and a small CNC router (delivered and assembled tonight) and next week, a laser engrave/cutter.Not much in the way of electronic equipment except for an ancient Tektronix scope. I expect things will improve as more members joint up.I think these places are a great idea and I hope this one succeeds.One indication that the place was full of geeks. Later in the evening, someone tried to order some pizzas on-line but the app (or website) kept crashing and losing the order. Instead of just phoning up to order, there was a group huddle for 20 minutes to try and sort out the website issues. Someone ended up driving up to order over the counter,

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: February 21, 2013, 11:20:34 am
content: Good work to the hackers of Hobart, hope you get the makerbot thing going nicely.Alternatively, I just paid my $33 dollar membership to the Channel Men's Shedhttp://www.channelmenshed.org.au/It's not actually open yet but it should be finished soon.It is a huge shed workspace full of all sorts or heavy machinery, mainly wood work and metal work, we have what looks to be a new CNC machine but it is not set up yet, I hope your allowed to drink beer on the premises, it's not much of a shed if you can't.Unfortunately no laser cutters or 3d printers.http://maps.google.com.au/maps?q=google+maps+margate+tasmania&hl=en&ll=-43.03078,147.262065&spn=0.001592,0.004128&client=firefox-a&hnear=Margate+Tasmania&gl=au&t=h&z=19

author: GeoffS
author_rank: Unknown
timestamp: February 21, 2013, 12:02:57 pm
content: That's a decent looking shed!If you do have a CNC router then I might just pay a visit, it's not that far.

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: February 21, 2013, 01:31:39 pm
content: It's worth a visit, the shed is huge, I think our agm is on the 28th.
How to identify/order - Page 1
Forum section: electronics / general

author: orbiter
author_rank: Frequent Contributor
timestamp: February 21, 2013, 11:09:19 am
content: Hi all,I'm about to order some parts in for a repair I'm doing at the moment.. Now I've got all the main partsI need, but I'm also trying to get some SMD transistors. I've looked on Farnell's website, and also on DatasheetCatalog etc, but no results are being foundThe various transistors I'm after purchasing are all numbered similar to the ones in the picture below (Q9, Q10, Q18 etc) but no matter what numbers I input, no results are found. Please could you advise as to how I search for these lil' components please?Many thanks guys

author: amspire
author_rank: Super Contributor
timestamp: February 21, 2013, 11:51:06 am
content: The SMDs use short SMD codes instead of part numbers, and there are various lists - but it is still often not easy.In this case, the part 2C is a BC549C and the W on the end in this case means Made In China.The 4C part is a BC559C and the W is the same as above.There are a lot of lists of SMD codes, such ashttp://www.marsport.org.uk/smd/mainframe.htm,and there are books you can buy such as this sample of the book:http://www.turuta.md/demobook/SMD-2012-sample.pdf

author: orbiter
author_rank: Frequent Contributor
timestamp: February 21, 2013, 12:00:07 pm
content: Ahh ok.. Thank you.
Shed Alarm Schematic Wanted - Page 1
Forum section: electronics / general

author: snipersquad100
author_rank: Frequent Contributor
timestamp: February 20, 2013, 05:35:59 pm
content: Has anyone got a decent Shed Alarm Schematic on eagle preferably?

author: Strada916
author_rank: Frequent Contributor
timestamp: February 21, 2013, 04:40:48 am
content: Not sure on month and year however. Silicon chip magazine have made one. It's an Australian publication. They have a Web sitewww.siliconchip.com.au.
Opinions/Suggestions for Review Idea - Page 1
Forum section: electronics / general

author: psycho0815
author_rank: Regular Contributor
timestamp: February 20, 2013, 03:17:50 pm
content: Hi, For a while now I've been having an idea for a Review I'd like to do and I'd like your opinions and suggestions for it.When i started to get back into electronics about a year ago one of the first pieces of kit i bought was naturally a multimeter or rather two.My biggest Problem with that was not only to decide on a particular meter but even to decide on a price range. I was lucky enough to actually have some money to spend, but there also was a lot of stuff to spend it on and i didn't want waste money.So since i bought a couple Meters in different priceranges since then here is what I'd like to do.I want to round up, say 5 to 6 Meters in different Pricebrackets and compare them to each other, focusing on what your extra money buys you and trying to figure out at what point prices and quality don't increase at the same rate anymore.so far i have:an older super cheapy (~15€)ELV branded CEM re-brand DM9199 (~70€)Agilent U1241B (~200€)Fluke 87-V (~400€)Now what i would like to know isa) is there any interest in something like this at all?b) Any suggestions which other meters to include in the lineup?I was thinking something ~50€ and maybe something around 100 -150 €.Not sure if there is a point in going between 200 and 400.Thanks in Advance,Psycho
Wyong field day this Sunday, anyone else going? - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: February 18, 2013, 08:45:10 am
content: As the title says?http://www.fieldday.org.au/If anyone else is going from Sydney, maybe we can do a nerd road trip.Dave.

author: TerraHertz
author_rank: Super Contributor
timestamp: February 18, 2013, 08:58:54 am
content: Having missed it the last couple of years, I was looking forward to going this year. Then some friends set a date for a camping trip about the same distance south of Sydney as Wyong is North. That's on Saturday and overnight. So it doesn't look like I'll be able to come to Wyong this year.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 18, 2013, 09:27:07 am
content: Quote from: EEVblog on February 18, 2013, 08:45:10 amYou should take a table there & flog all your garbage room finds & dodgy ex-review multimetersYou'll probably get more genuine interest there than at Electronex.

author: jhalar
author_rank: Regular Contributor
timestamp: February 18, 2013, 09:56:46 am
content: Thanks for the reminder. I would have missed it again for the 3rd year running.

author: EEVblog
author_rank: Unknown
timestamp: February 18, 2013, 10:06:18 am
content: Quote from: mikeselectricstuff on February 18, 2013, 09:27:07 amI wasn't flogging anything at Electronex!Not sure how many people want LCD monitors at a field day?I probably should go through my junk and see what I've got though, but really, I don't think I have a huge amount, SWMBO doesn't allow me to hoard muchDave.

author: EEVblog
author_rank: Unknown
timestamp: February 18, 2013, 10:06:47 am
content: Quote from: jhalar on February 18, 2013, 09:56:46 amIt would be the 4th or 5th year running for me!Dave.

author: snoopen
author_rank: Contributor
timestamp: February 20, 2013, 11:39:15 am
content: It's 10 mins down the road from me so I'll be there for sure!I went for the first time last year and came back with lots of fun toys to take apart ^_^Dave, there we a lot of monitors for sale last year, but I wasn't around long enough to see any being bought.
Replacing AC fan in old test equipment - Page 1
Forum section: electronics / general

author: reagle
author_rank: Unknown
timestamp: February 20, 2013, 03:41:51 am
content: I just picked up a cool vintage (circa 1985) electronic load off ebay (Kikusui brand), and am looking to replace its cooling fan. The original is Minebea 2415PS-10W-B30 100VAC fan. The company seems to now be a part of NMB, but the 100VAC version is nowhere to be found in stock. Their 115VAC version though is easily obtainable. Hence is my question- what happens when you run a 115VAC rated fan off 100VAC? The load powers it off a separate winding on the mains transformer. I realize I could feed it off mains, but would rather not mess with the original wiring.Load teardown pictures are coming up in a separate thread;)

author: UPI
author_rank: Regular Contributor
timestamp: February 20, 2013, 04:19:20 am
content: This Orion with similar specs shows to operate from 80-130. It might do the trick for you.http://www.mouser.com/ProductDetail/Orion-Fans/OA825AP-11-1TB/?qs=sGAEpiMZZMtmglTKXDHoWhczmPfqpfdFaePKNT2aQx8%3dI'm not sure about the NMB voltage operating range.

author: SeanB
author_rank: Super Contributor
timestamp: February 20, 2013, 04:42:46 am
content: It will work fine, slightly lower airflow but you will not notice it. Will run a little cooler in the fan motor and have a longer life. Just make sure you get a ball bearing fan and not a sleeve bearing one.

author: reagle
author_rank: Unknown
timestamp: February 20, 2013, 11:49:49 am
content: Thanks! Will try and see
Motor stop capacitor? - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 19, 2013, 11:51:36 pm
content: I found a 400uF, 50V capacitor marked "motor stop". Exactly what is it? It is made by Epcos but I couldn't find any documentation on their website.

author: ivan747
author_rank: Super Contributor
timestamp: February 20, 2013, 12:21:47 am
content: Maybe it is related to this?http://www.epcos.com/web/generator/Web/Sections/Components/Page,locale=en,r=263282,a=973484.htmlI think it might be unlikely due to the low capacitance but it could be. Any pictures to give us a clue?

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 20, 2013, 02:02:40 am
content: It's about the size of a C cell and oddly enough, it is rated in AC voltage.

author: SeanB
author_rank: Super Contributor
timestamp: February 20, 2013, 04:46:56 am
content: Motor START capacitor, used in an induction motor to provide starting torque, then disconnected either by a centrifugal switch or a PTC element after a few seconds. Basically a 400uF 50V metal foil capacitor capable of withstanding a short term overload of 100V for around 10 seconds every 5 minutes. Not rated for full time operation at rated voltage.

author: NiHaoMike
author_rank: Super Contributor
timestamp: February 20, 2013, 05:09:55 am
content: Quote from: SeanB on February 20, 2013, 04:46:56 amIt really does say "motor stop".
pi is wrong!? - Page 1
Forum section: electronics / general

author: AlfBaz
author_rank: Super Contributor
timestamp: February 19, 2013, 04:00:34 pm
content: An interesting and convincing talk on why the circle constant pi is wrong...http://tauday.com/

author: c4757p
author_rank: Super Contributor
timestamp: February 19, 2013, 04:16:03 pm
content: That is a funny definition of "wrong"...

author: mariush
author_rank: Super Contributor
timestamp: February 19, 2013, 06:29:36 pm
content: I'll just leave this here:

author: firewalker
author_rank: Super Contributor
timestamp: February 19, 2013, 06:50:56 pm
content: Alexander.

author: firewalker
author_rank: Super Contributor
timestamp: February 19, 2013, 06:58:00 pm
content: In the same sense, base ten system is wrong for everyday use.Alexander.

author: MikeK
author_rank: Super Contributor
timestamp: February 19, 2013, 08:19:06 pm
content: And conventional current flow is wrong. So what?

author: AlfBaz
author_rank: Super Contributor
timestamp: February 19, 2013, 11:13:00 pm
content: Quote from: firewalker on February 19, 2013, 06:58:00 pmA bit late for these guys, 12 is already taken by Homer... Doh!

author: ivan747
author_rank: Super Contributor
timestamp: February 20, 2013, 12:17:05 am
content: I actually like the docenal system a lot. We would have 20 docenal hours a day, 10 inches would be 1 foot (and the metric system wouldn't have to be invented), ounces would work right, six packs would make more sense in my mind, and more importantly, I can express 2/3 in docenal (as opposed to decimal) without rounding.

author: free_electron
author_rank: Super Contributor
timestamp: February 20, 2013, 12:19:07 am
content: we should all switch to hexadecimal notation10 fingers , two eyes, two ears, two nostrils. there.that'll fix it once and for all.

author: ivan747
author_rank: Super Contributor
timestamp: February 20, 2013, 12:24:11 am
content: Actually, I think docenal to hexadecimal is easier than decimal to hexadecimal.
Where to get all the parts for this circuit ? - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: February 17, 2013, 02:37:47 pm
content: I think I got most things needed, need to source the 666 timer and the bat.

author: Spawn
author_rank: Frequent Contributor
timestamp: February 17, 2013, 03:03:12 pm
content: Parts are here:https://www.eevblog.com/forum/chat/test-your-circuit-diagnostic-skills-here/msg9459/#msg9459https://www.eevblog.com/forum/chat/funny-circuit-diagram/msg149725/#msg149725https://www.eevblog.com/forum/chat/funny-schematic/msg188101/#msg188101https://www.eevblog.com/forum/chat/xkdc-circuit-diagram/msg10486/#msg10486https://www.eevblog.com/forum/chat/my-wife-saw-this-and-thought-of-me/msg20768/#msg20768https://www.eevblog.com/forum/reviews/xkcd-circuit-diagram/msg36231/#msg36231goodluck with collecting the parts
Looking for specific OLED display - Page 1
Forum section: electronics / general

author: Jonny
author_rank: Regular Contributor
timestamp: February 20, 2013, 08:49:19 am
content: GreetingsI have a livescribe pen with well known dead display fault and no means to get a complete replacement through the normal channels.Oddly enough this seems to be the only device that uses a 96x18 matrix as a search for 96x18 OLED only results in livescribe pens.The only number on the thin film ribbon that shows up in a search is ssd1305u1, which shows up without the u1 and seems to be the number for the control IC rather than a complete module.My guess is this display was specifically made for this product/company with a strict ban on selling them to joe public.I found a 96x16 but it had too many connections, this only has 10 wires in.Or maybe you may know of a large OEM source of such displays?ThanksJonathan

author: jeroen74
author_rank: Frequent Contributor
timestamp: February 20, 2013, 09:25:13 pm
content: Most likely an custom module. Have you tried the pen manufacturer itself?

author: Jonny
author_rank: Regular Contributor
timestamp: February 21, 2013, 07:25:02 pm
content: Nah, I don't hold much hope but might flick em an email anyway
24 Port Gigabit Switch Teardown - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: February 16, 2013, 10:16:13 pm
content: interesting use of asics to switch a 24 port Ethernet switchhttp://blog.thelifeofkenneth.com/2013/02/tear-down-of-hp-procurve-2824-ethernet.html
Fun with traceroute ... - Page 1
Forum section: electronics / general

author: mamalala
author_rank: Unknown
timestamp: February 15, 2013, 09:21:30 pm
content: Hi all,if you are on a unix-like system, open a shell and enter:traceroute -m 66 216.81.59.173On Windows, the command is:tracert -h 66 216.81.59.173Someone had fun with a free netblock and DNS, showing the opening text from Star Wars, each hop = one lineGreetings,Chris

author: ecat
author_rank: Frequent Contributor
timestamp: February 15, 2013, 09:56:50 pm
content: That made me chuckleI could do twohakkoshaiku with mine

author: divelectservices
author_rank: Contributor
timestamp: February 16, 2013, 02:13:22 am
content: Reminds me of the totally awesome: telnet://towel.blinkenlights.nl (port 23)
Shout out to Jaqie - Page 1
Forum section: electronics / general

author: smashedProton
author_rank: Frequent Contributor
timestamp: February 17, 2013, 07:26:40 am
content: Hi Jaqie!You have mentioned in your previous topics that you are going through some tough times. If I remember correctly, you would almost be halfway through it by mow. Us at the eevblog forum wish you good luck! I hope that you can have the time to dedicate to the forum sometime soon. Go get em. %-B
Valve sacked about 30 members of staff including Jeri Ellsworth - Page 1
Forum section: electronics / general

author: Moshly
author_rank: Regular Contributor
timestamp: February 15, 2013, 03:20:33 pm
content: Wowhttp://www.bbc.co.uk/news/technology-21471974As the curtain was being lifted on the Linux store, Valve sacked about 30 members of staff including high-profile developer Jeri Ellsworth who was reportedly working on the hardware behind the company's console.Valve boss Gabe Newell took the unusual step of issuing a statement about the lay-offs to curb speculation about what they would mean for the company's many projects.He said the sackings did not mean it was cancelling any projects or changing its priorities."We're not going to discuss why anyone in particular is or isn't working here," he said.

author: andersm
author_rank: Super Contributor
timestamp: February 15, 2013, 05:41:38 pm
content: From whatpeople have dug up, the layoffs were not focused on the hardware group. Reportedly Valve does fire people frequently, but at the same time having so many go at the same time seems unusual.
"Coconut" + fusion thermo nuclear = yummy soup - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: February 14, 2013, 05:27:13 am
content: Although not as popular as LHC (Large Hadron Collider) project, personally I do follow enthusiastically the ITER project since the beginning.For those who don't know what "ITER" is (International Thermonuclear Experimental Reactor) ->http://www.iter.org/faqIts quite amazing that simple thing as a "coconut" plays a big role in fusion thermonuclear chamber.The most efficient coating material for the cryopanels that keep the vacuum in the ITER Tokamak clean: coconut-shell charcoal.Source ->http://www.iter.org/sci/beyonditer

author: TerraHertz
author_rank: Super Contributor
timestamp: February 15, 2013, 02:53:46 am
content: Well that was frustrating. WHY is charcoal beneficial as a cryo-panel coating, and why is coconut shell charcoal (from 2002 no less) the best kind?Not to go into the deeper issues of the viability of a fusion machine topology in which there's a fundamental no-win engineering problem - which should be closer to the plasma, the shielding water-heating layer, or the superconductor coils?Plus the other little problem - the (non)availability of He3.http://ihp-lx2.ethz.ch/energy21/fusionillusions.pdfFusion Illusions: Dangerous illusions of commercial energy production from deuterium-tritium fusion.

author: BravoV
author_rank: Super Contributor
timestamp: February 15, 2013, 03:57:29 am
content: Quote from: TerraHertz on February 15, 2013, 02:53:46 amThough I don't have any clue about this thing, but why not ?Any scientifically proven reasons why you're so frustrated that this coconut is not the best or the right coating material for the "thermonuclear" grade plasma soup chamber ?
EEVforum Chatbox - Page 1
Forum section: electronics / general

author: IonizedGears
author_rank: Regular Contributor
timestamp: February 14, 2013, 10:45:17 pm
content: I took the liberty to create a chatbox for the eevforum since there isn't one, the chatbox is hosted by chatango by the way . Don't worry the chatbox is by no means connected to this forum and is completely isolated and i made it so that the name includes unofficial just in casehttp://unofficialeevchat.chatango.com/

author: EEVblog
author_rank: Unknown
timestamp: February 14, 2013, 11:46:07 pm
content: I went to install one called SideSparks, but the host website looks to be goneski!Dave.
Fake Cheep Dangerous Power Supply's Mashup - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: January 16, 2013, 09:00:41 pm
content: http://www.arcfn.com/2012/10/a-dozen-usb-chargers-in-lab-apple-is.html

author: SeanB
author_rank: Super Contributor
timestamp: February 14, 2013, 07:28:43 pm
content: I will add this.....http://youtu.be/D1_v5yToTYk
UK - Southern manufacturing show - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 14, 2013, 12:01:31 am
content: Anyone go/going to this? I went today & it was heaving - they had to run buses to distant car parks.Show was bigger than last year, and also a lot busier. Must be a good sign...My best find - a company 30 mins from me who can assemble PCBs 1.6m long!

author: notsob
author_rank: Frequent Contributor
timestamp: February 14, 2013, 12:32:23 am
content: Says - [tongue in cheek]As England is sooo small isn't everything within 30 mins of you.

author: Neilm
author_rank: Super Contributor
timestamp: February 14, 2013, 06:44:53 am
content: Quote from: notsob on February 14, 2013, 12:32:23 amNonsense - you have obviously not driven in England. You can't drive more than 5 miles in 30 mins - you'll spend the whole time in traffic jams

author: G7PSK
author_rank: Super Contributor
timestamp: February 14, 2013, 01:42:21 pm
content: Quote from: Neilm on February 14, 2013, 06:44:53 amWhere I am you can drive 5 miles in ten minuets without even speeding. Providing there are no tractors on the road.

author: deephaven
author_rank: Frequent Contributor
timestamp: February 14, 2013, 02:00:53 pm
content: Quote from: mikeselectricstuff on February 14, 2013, 12:01:31 amI went yesterday. If I had known you were going I would have suggested meeting up for a chat.Yes, it was very busy and all the exhibitors I talked to were in high spirits on what a good turnout it was. I always find it a useful show, I never know what I'm going to get out of it till I go and always come back with lots of useful info on products and services.Maybe next year Mike?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 14, 2013, 02:23:58 pm
content: Annoying that all the stands I spent time talking to people on were the ones without the nice nibbles - you can sometimes do a complete lunch from foraged freebies, but I feel guilty grabbing sweeties from stands of companies I have no interest in!One thing I like about that show over others (most of which have died now) is it's a mix of electronics, mechanics and metal-bashing type people, with some cool CNC porn on view - they had the Hypermill cycle helmet on display (not machining one it live unfortunately)
Lockheed Martin to solve the world's energy problems? - Page 1
Forum section: electronics / general

author: Time
author_rank: Frequent Contributor
timestamp: February 14, 2013, 04:10:03 am
content: Google and Lockheed Martin? Interesting combo.Discuss!

author: smashedProton
author_rank: Frequent Contributor
timestamp: February 14, 2013, 04:22:18 am
content: He looks like a silicon valley hippy version of Nicholas Cage
A weird and wonderful RGB LED experience - Page 1
Forum section: electronics / general

author: TriodeTiger
author_rank: Regular Contributor
timestamp: February 13, 2013, 10:10:30 am
content: I felt for some reason to share this with someone.I had purchased some veroboard and never made anything with it for a year, so I wanted to show off a simple RGB LED fader (I got the common cathode LED with an Arduino kit) with button input and AVR.So - I hooked up the LED and tested it. It was bright with a 10k resistor at 5V so I removed the ground to the breadboard as it was hurting my eyes (coming from an Arduino with USB, so common with earth) and put in next the buttons. I put in a wire from button to ground and the LED lit up - huh?It seemed a little hit and miss - I wondered how on earth ground can be found through a button (which was d/c when not pressed) or if somehow it was fooling me and had a path through the button somehow, a 10k pullup to an output.Something clicked in my head and I discovered I was touching the exposed leads of the wire, it had nothing to do with the button.In the full blue, I measured, 1.4-4uA was enough to light up the tip of my finger with a desk lamp as background light. Red wasjustvisible, green a little brighter than red, but 1/3 of blue still. I did this before with 36V or so from 9V batteries and a red LED to show people I really can power an LED through me and earth - but it was hardly visible.Are RGB LEDs super super high efficient? It's not even clear, it is diffused. That blue is just insanely bright before it reaches 200uA! Can I make a blue/green flashlight that lasts seemingly forever? I am completely baffled why it is like this, and more so happy I knew to test "Lets take one foot off the ground and see if the brightness halves..."It is 2am so I am excited by random things - but discovery is what makes electronics fun.TriodeTiger.

author: Psi
author_rank: Super Contributor
timestamp: February 13, 2013, 10:21:51 am
content: Yeah, it doesn't take much current before you get light.Red/Orange are the most efficient.Lots of research is going into getting white leds more efficient at the moment.Interestingly, if you pulse leds for some reason (pwm etc.), you can even get them to produce a little light with one pin connected and the other pin floating in air.Happens if the switching frequency matches up with the length of your wiring and it acts like a transmitter, you get a small current through the led into the air.

author: houdini
author_rank: Regular Contributor
timestamp: February 13, 2013, 10:44:12 am
content: i have had the green ones light up while soldering them with one side in the air and the other on the iron.

author: Flávio V
author_rank: Regular Contributor
timestamp: February 13, 2013, 10:53:18 am
content: Some of my power LEDs also light up a bit when i touch the wires(6.6V,700mA LEDs, create a light of near 5V)

author: Psi
author_rank: Super Contributor
timestamp: February 13, 2013, 11:44:49 am
content: Quote from: houdini on February 13, 2013, 10:44:12 amI wonder if that's 50Hz earth hum radiating from the iron or a thermoelectric effect from the heat.
Do Say! - Page 1
Forum section: electronics / general

author: r90s
author_rank: Regular Contributor
timestamp: February 12, 2013, 08:34:02 pm
content: Robocalls are annoying...http://arstechnica.com/information-technology/2013/02/robocalls-are-annoying-so-this-man-is-using-raspberry-pi-to-stop-them/
Turing's Cathedral, The Origins of the Digital Universe - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: February 11, 2013, 08:00:15 pm
content: Greetings EEVBees:--I just discovered a new book about the history of computing, "Turing's Cathedral, The Origins of the Digital Universe" by George Dyson, son of Freeman Dyson. Although the title of the book mentions Turing, the main protagonist of the story is John von Neumann. It is the story of MANIAC, the ground breaking stored program computer. Some of my favorite usual suspects show up in this story; David Hilbert, Kurt Godel, Freeman Dyson, Max Born, who was Olivia Newton-John's grandfather, and many others. Oddly enough von Neumann who worked with Teller on the H-Bomb, was worried about the effect the computer might have on humanity."Turing's Cathedral" is available at Amazon, as a hard cover or e-book at the below link. I highly recommend.http://www.amazon.com/Turings-Cathedral-Origins-Digital-Universe/dp/0375422773“If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.”John von Neumann 1903 -1957Best RegardsClear Ether

author: Unknown
author_rank: Unknown
timestamp: February 11, 2013, 08:43:04 pm
content: Good one. Thank you

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 11, 2013, 08:49:17 pm
content: now i get it, Turing's Cathedral + Einstein's Quantum Mechanics = Tron.
Bamboo Chopstick Assisted Placement Die on PCB Panel - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: February 12, 2013, 07:23:27 pm
content: our old freind bunnie aka Andrew Huang has a tour factory that matureness USB sticksenjoyhttp://www.bunniestudios.com/blog/?p=2946
EEVBlog Apprentice - Page 1
Forum section: electronics / general

author: lewis
author_rank: Frequent Contributor
timestamp: February 09, 2013, 12:16:56 pm
content: So what happened to Phil the EEVBlog apprentice with the dodgy voice? Some stuff about laser physics (IIRC) would have been very insightful.

author: EEVblog
author_rank: Unknown
timestamp: February 09, 2013, 12:20:05 pm
content: Quote from: lewis on February 09, 2013, 12:16:56 pmHe couldn't find the left hand screwdriver, so I had to sack him.He's back working as a physics patent attorney (no jobs in lasers).Dave.

author: lewis
author_rank: Frequent Contributor
timestamp: February 09, 2013, 02:39:29 pm
content: I got my apprentice to root around in the drawer the other day for an 'aluminium magnet', he spent quite a while doing it too! Best of luck to Phil, would be good to get him back for other guest appearances if he's got time, Doug Ford too!

author: Pat Pending
author_rank: Regular Contributor
timestamp: February 10, 2013, 02:58:32 am
content: Now as an apprentice, I been on quests for a "rubber hammer", "can of multi-coloured paint" and a "long stand"

author: cwalex
author_rank: Frequent Contributor
timestamp: February 10, 2013, 03:49:34 am
content: best one I heard was send 'em to the hardware store and ask them to buy a "long weight"

author: Shuggsy
author_rank: Regular Contributor
timestamp: February 10, 2013, 07:08:06 am
content: Quote from: cwalex on February 10, 2013, 03:49:34 amSend them after some frequency grease, chemlight batteries, or a can of squelch.

author: M. András
author_rank: Super Contributor
timestamp: February 10, 2013, 06:18:40 pm
content: they can't be smart enough if the answer isnt f*****f instead of going to get the imagined item

author: G7PSK
author_rank: Super Contributor
timestamp: February 10, 2013, 06:29:19 pm
content: The one most used in my day was to send them out for a tin of elbow grease.

author: kizzap
author_rank: Unknown
timestamp: February 11, 2013, 02:02:06 am
content: Quote from: Pat Pending on February 10, 2013, 02:58:32 amrubber hammer...also known as a rubber mallet?http://www.google.com.au/imgres?imgurl=http://i.istockimg.com/file_thumbview_approve/2493482/2/stock-photo-2493482-rubber-hammer.jpg&imgrefurl=http://www.istockphoto.com/stock-photo-2493482-rubber-hammer.php&h=253&w=380&sz=17&tbnid=H1P47Q61e-OT6M:&tbnh=71&tbnw=106&zoom=1&usg=__hHJhZwX44fJFDSDZCuHqBv-Kq3Y=&docid=-h920jHCqvcW-M&sa=X&ei=9lAYUdWODIvtlAWS14GIAg&ved=0CEoQ9QEwAg&dur=1579

author: steve30
author_rank: Frequent Contributor
timestamp: February 11, 2013, 05:14:30 am
content: Quote from: G7PSK on February 10, 2013, 06:29:19 pmI remember when I was in Year 4 at primary school, the teacher sent someone round all the school to try and get some elbow grease to facilitate cleaning the whiteboard.

author: ColinA
author_rank: Contributor
timestamp: February 11, 2013, 11:45:27 am
content: Ah the new guy..."can you find the wire stretcher""grab the phloem tube of my tool box""go to purchasing and order a nool lab 100""Charmin called for ya"
Power Strip and AC Voltage Detector - Page 1
Forum section: electronics / general

author: Pagweb
author_rank: Newbie
timestamp: February 10, 2013, 02:51:14 am
content: Greetings, Everyone.I have a question. See, I purchased an AC voltage detector and was testing it around my house when I realized that some of my devices triggered it. Those devices were supposed to be off, but they triggered the voltage detector. They were connected to a power strip. When I unplugged them from the power strip they stop triggering the detector. But the power strip has a switch and it was set to off. This happened with all the power strips in my house. Whether they are switched on or off, they trigger the detector. Can anyone tell me what is up with that? I find it really weird.Thanks.

author: IanB
author_rank: Super Contributor
timestamp: February 10, 2013, 02:58:08 am
content: Is it a power strip or a surge protector?Non-contact voltage detectors are very sensitive and will give false positives on devices that are capacitively connected to the supply. For example, my iPhone will make a voltage detector beep like mad when it is plugged into the charger.

author: Pagweb
author_rank: Newbie
timestamp: February 10, 2013, 03:11:12 am
content: Yes. They are power strips with surge protection. Well, I guess that's the answer. And also, now that you mention it, my LG motion phone charger also does triggers the voltage detector...Anyway, thanks for info.
TI Blog on Op Amp Topics - Page 1
Forum section: electronics / general

author: RichardD
author_rank: Newbie
timestamp: February 09, 2013, 06:03:23 pm
content: I don't know if this very good blog by TI's Bruce Trump has already been mentoned elsewhere. It is called "The Signal" and provides a very crisp overview of analog topics that plague anyone working with Op Amps:http://e2e.ti.com/blogs_/b/thesignal/default.aspxRichard.

author: kg4arn
author_rank: Unknown
timestamp: February 09, 2013, 11:59:12 pm
content: Looks interesting. Thanks
ECL and Some Other Serious Electronic Goodness - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: February 09, 2013, 10:38:30 am
content: I was checkingwhat ECL is on Wikipediawhen I stumbled upon this graphic:It is hand drawn, so somebody has put some serious effort (and ninja skillz) into it, which made me wonder who the creator was because there may be some other good stuff behind it. Not only that I was not disappointed but I may have drooled a little!Check this out:Revealing the Basic Idea behind ECL Circuitsand this:How the Wilson current mirror equalizes the input and output currentsAnd ALL (!!) of this:http://en.wikibooks.org/wiki/Category:Circuit_IdeaProf. Cyril Mechkovfrom the University of SofiaHuge props to you sir!

author: amyk
author_rank: Super Contributor
timestamp: February 09, 2013, 11:53:32 am
content: Certainly great skills especially with graph paper, but I think this applies:http://en.wikipedia.org/wiki/Template:Should_be_SVG
Barrow lens and Dave's video - Page 1
Forum section: electronics / general

author: DavidDLC
author_rank: Frequent Contributor
timestamp: February 08, 2013, 05:50:52 am
content: Thank you Dave, I saw your video regarding Barrow lens to increase the working area on the microscope and I had the task to install one on mine.Well, today after coming back from my trip to China I installed a 0.75X barrow lens on my microscope and I'm happy with the results !Also I'm happy with the savings, the price of the barrow lens here in the USA is $100.00 USD, the price in China was $50.00 USD, half of the price.David.

author: robrenz
author_rank: Super Contributor
timestamp: February 08, 2013, 12:59:07 pm
content: Could have saved yourself the triphere

author: DavidDLC
author_rank: Frequent Contributor
timestamp: February 08, 2013, 05:41:24 pm
content: Dang it.I was checking their website for long time, so the sales are recent.Well, my company paid for the trip, so no cost added to the piece.( And I don't see a 0.75x barrow lens on that list )Thanks for the link.David.
Looking for Metex 4500 multimeter schematic/manuals - Page 1
Forum section: electronics / general

author: ttp
author_rank: Regular Contributor
timestamp: December 11, 2012, 10:29:16 am
content: Decided to bring my 22 year old Metex 4500H out of retirement. Has been working great, then stored on the shelf for few years (battery taken out). Now doesn't give any signs of life when swithed on. Would appreciate if someone could point me to service documentation of any kind.

author: ttp
author_rank: Regular Contributor
timestamp: February 08, 2013, 11:44:44 am
content: In the end it works fine, more info and pics athttp://mjlorton.com/forum/index.php?topic=170.msg1806#msg1806
Make your own Arduino Shield - Page 1
Forum section: electronics / general

author: oyvdahl
author_rank: Newbie
timestamp: February 08, 2013, 09:57:08 am
content: Hey!I am putting together a free webinar where I'll teach how to create your own Arduino shield. Focusing on the practical stuff of designing the board and making a prototype.I'm interested in what you think it should cover. What is the top two questions you would like to have answered in such a webinar?Not sure if I'm allowed to post link here, so if you would like some more info you can send me a message.Oyvind

author: Mr Smiley
author_rank: Frequent Contributor
timestamp: February 08, 2013, 04:44:51 pm
content: Hi,How to put the bootloader onto a blank atmeg, what's needed and how to do it.How to program after the bootloader is on the atmeg, what's needed and how to do it.I know its about the shield, but people want to go from the shield to a board, using the shield as a prototyping board for the software, and then want to take that software onto a dedicated project board, and that's where a lot of people give up because there not sure of what or how to do it with or without a bootloader. And how to continue icsp after it's there.How to take the program from the shield after development and put it onto a prototype pcb, what's needed, how to program on board and whats needed.Something up there you might want to include.Mr Smiley

author: Thor-Arne
author_rank: Unknown
timestamp: February 08, 2013, 06:33:26 pm
content: Thumbs up for the webinar of course.Main general issue with the Arduino is the strange pin-spacing, countless times I've seen newbies try to fit a standard strip board on the headers.Otherwise, there is the issue with clearance to the parts on the stacked boards.Some words about pin loads and power supply might be on its place.@Mr Smiley:I think that if someone is at the point where they want to make their own board they should be familiar enough with the Arduino forums, and/or try to google for "DIY ARDUINO".And it is possible to buy Atmel chips preprogrammed with the bootloader so one can "program" with the Arduino board.