hybridfree/eevblog-posts huggingface dataset:
Crazy Chinese shipping - Page 1
Forum section: electronics / general

author: Phaedrus
author_rank: Frequent Contributor
timestamp: July 22, 2013, 10:20:33 pm
content: I ordered a couple SMD resistor books off Amazon on Thursday. 1%, 5%, and some capacitors, all 0603. I paid about $12 in shipping. I got them today. The shipping label says they came from Hong Kong.How on earth did I get resistor books from Hong Kong in 3 days via DHL for $12 shipping?

author: Corporate666
author_rank: Unknown
timestamp: July 22, 2013, 10:34:17 pm
content: Quote from: Phaedrus on July 22, 2013, 10:20:33 pmThe whole country of China is an economic machine that is setup to make and deliver stuff cheaply. To that end, Chinese shipping is heavily subsidized by the government. What it costs to send DHL from them to you is a fraction of what it costs to send from you to them.

author: rkupka
author_rank: Regular Contributor
timestamp: July 23, 2013, 10:44:51 am
content: I´ve ordered 5 different items from 5 different locations in China, HongKong and Australia on the same day in June via ebay (SMD books, LEDs, transistors assortment packs...)The first order was delivered approx. 2 weeks later, followed by 3 others in the next 4 days.It took 5 weeks to deliver the last package.All shipment methods were "economy intl." So, it is really unpredictible to guess when the packages arrive, but what would you expect from "Free shipping, economy intl."Finally, Im satisfied with all items. It would be cool to have them all delivered in 5 business days for free, but you know... miracles happen only occasionaly and according to Murphy, they happen to everyone but me.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: July 23, 2013, 02:26:51 pm
content: I've found post from China tends to take 2-3 weeks, but I just got something that arrived in just under a week (ordered Tues, arrived following Mon), postage US$10 for around 500g weight.

author: Dago
author_rank: Frequent Contributor
timestamp: July 23, 2013, 02:37:59 pm
content: Quote from: mikeselectricstuff on July 23, 2013, 02:26:51 pmThere seems to be a large variance in shipping times from china. I've had stuff come in a week but mostly it seems to take around 3 weeks. I *think* I've noticed that stuff coming from Hong Kong takes the longest to arrive, mainland china stuff comes in faster.

author: Stonent
author_rank: Super Contributor
timestamp: July 23, 2013, 04:13:40 pm
content: I ordered a 10 pack of 28 pin DIP sockets that arrived in about a week. The actual product was 1 or 2 dollars in a small bubble pack envelope so I figure something that cheap wasn't bothered to be scrutinized.
Zimmerman Case - Page 1
Forum section: electronics / general

author: IonizedGears
author_rank: Regular Contributor
timestamp: July 24, 2013, 01:17:27 am
content: What do you guys think of it?Facts:Trayvon was much more muscular and bigger than Zimmerman due to football.The picture you saw in the news was a very old picture of Trayvon at around 14 years old so that people thought he was a kid and the news channel could get more views, Trayvon is 17 years old.Zimmerman followed Trayvon as he looked suspicious and the neighborhood he was in recently had problems with gangs? and violence.After Trayvon lost Zimmerman, Trayvon circled back and started bashing Zimmerman's head into the concrete to which Zimmerman shot Trayvon as self defense.Zimmerman wasn't racist at ALL, he voted for Obama and he even took a black girl to prom.Point is: Zimmerman is innocent, the news channels brain washes everybody by only giving partial info so that people remain as sheep. People need to do their own research to get a proper view of a situation.What do you guys think?

author: smashedProton
author_rank: Frequent Contributor
timestamp: July 24, 2013, 01:26:29 am
content: This forum has too much of this...___________________________It should not have gone to trial, it is a textbook self defense case. The much larger issue is that the US federal government seeks to extinguish an entire race of people.

author: JoeyP
author_rank: Frequent Contributor
timestamp: July 24, 2013, 01:29:04 am
content: Quote from: smashedProton on July 24, 2013, 01:26:29 amI agree. I'm sure you can find forums all over the place where you can debate this all day long. Seems far removed from electronics.

author: IonizedGears
author_rank: Regular Contributor
timestamp: July 24, 2013, 01:34:11 am
content: There are two main categories on the EEVForum. Electronics and EEVBlog. This is the general chat and is not under the electronics category so I thought this would fit perfectly here, which it does.And the description says offtopic stuff is okay, this is my first off topic post :/Otherwise i am not getting the encrypted hint here -_-

author: millerb
author_rank: Regular Contributor
timestamp: July 24, 2013, 01:36:52 am
content: No offence, but I don't come here to read about this kind of shit.

author: IonizedGears
author_rank: Regular Contributor
timestamp: July 24, 2013, 01:39:51 am
content: :/ Okay then, guess i shouldn't have posted it then.

author: free_electron
author_rank: Super Contributor
timestamp: July 24, 2013, 02:15:19 am
content: as long as the media keep talking about 'african american' , 'latino' etc... racism is never going to disappear.They don't call me and some of my collegues 'european american'. so why do we need african american ?

author: GeoffS
author_rank: Unknown
timestamp: July 24, 2013, 02:16:27 am
content: Quote from: smashedProton on July 24, 2013, 01:26:29 amTrue.
USPS service - Page 1
Forum section: electronics / general

author: Grayfox
author_rank: Regular Contributor
timestamp: July 21, 2013, 10:35:37 pm
content: Is it just my order or are they really this slow?Ordered a decade resistor box kit on the 12th and just left the country(well i hope) the other day.Electronic Shipping Info Received on July 12, 2013Acceptance on July 12, 2013, 12:53 pm in ACWORTH, GA 30102Dispatched to Sort Facility on July 12, 2013, 1:42 pm in ACWORTH, GA 30102Processed at USPS Origin Sort Facility on July 12, 2013, 7:51 pm in ATLANTA, GA 30320Depart USPS Sort Facility on July 12, 2013 in ATLANTA, GA 30320Processed through USPS Sort Facility on July 17, 2013, 7:04 am in MIAMI, FL 33112Depart USPS Sort Facility on July 18, 2013 in MIAMI, FL 33112I cant see what the 5 day hold up was from atlanta to miami

author: IanB
author_rank: Super Contributor
timestamp: July 21, 2013, 10:41:07 pm
content: If it is a package or a non-standard letter size it will (in my experience) go much slower than regular letter post. Standard letters go through automatic sorting machinery, but packages get sorted by hand when time and staffing allows and seem to spend a lot of time sitting in warehouses.

author: c4757p
author_rank: Super Contributor
timestamp: July 21, 2013, 10:41:33 pm
content: July 12 was a Friday; movement is slow or delayed on weekends.

author: Grayfox
author_rank: Regular Contributor
timestamp: July 21, 2013, 10:46:50 pm
content: And being a kit it would most likely be in a padded bag/envelope styled thing.Thanks for the info.
Why is E=MC2 wrong - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: July 21, 2013, 09:04:26 am
content: I came across these this today. On its own its very interesting but they do a whole series of video's that are very relevant to electronics, so I thought I would post this one and put the cat amongst the pigeons.http://youtu.be/mkiCPMjpysc

author: Psi
author_rank: Super Contributor
timestamp: July 21, 2013, 09:22:55 am
content: I like the one about pi being wrong.(Should be 6.28 because there's more uses of 2*pi than there are of pi by itself)

author: KedasProbe
author_rank: Frequent Contributor
timestamp: July 21, 2013, 09:32:36 am
content: The same story is true for F=m.aFirst of all it are vectors (except m)and second this is only true for a constant mass, this removes a term in the equation.(try to fire a rocket with f=ma and at launch you will say)

author: 4to20Milliamps
author_rank: Regular Contributor
timestamp: July 21, 2013, 03:18:07 pm
content: Science has a way to go before they can say what is wrong or right, I don't think anyone can argue that it wasn't a step in the right direction.http://www.independent.co.uk/news/science/einsteins-theory-is-proved--and-it-is-bad-news-if-you-own-a-penthouse-2088195.htmlScientist seem to be more interested in proving everyone else wrong rather than working toward a common goal, they tend to sweep things under the rug or discredit them based on political leanings.http://books.google.com/books?id=el5YAAAAYAAJ&dq=gravity%20saros&pg=PA110#v=onepage&q=gravity%20saros&f=falsehttp://en.wikipedia.org/wiki/Allais_effecthttp://en.wikipedia.org/wiki/Saros_(astronomy)As above so below?

author: Phaedrus
author_rank: Frequent Contributor
timestamp: July 21, 2013, 03:37:58 pm
content: Some people get butthurt when they're wrong or get told they have no evidence for their position.

author: IonizedGears
author_rank: Regular Contributor
timestamp: July 21, 2013, 04:57:51 pm
content: Quote from: Psi on July 21, 2013, 09:22:55 am2*Pi = Tau or T

author: sleemanj
author_rank: Super Contributor
timestamp: July 22, 2013, 06:43:47 am
content: Quote from: IonizedGears on July 21, 2013, 04:57:51 pm

author: Psi
author_rank: Super Contributor
timestamp: July 22, 2013, 10:17:11 am
content: Yeah, that's the video that showed me
Sagan's Cosmos getting a reboot (w/ Neil Degrasse Tyson) - Page 1
Forum section: electronics / general

author: Phaedrus
author_rank: Frequent Contributor
timestamp: July 21, 2013, 08:13:47 pm
content: The fact that it's Dr. Tyson and based on the original series by Carl Sagan is very hopeful.The animated scenes, the "Transformers" style soundtrack, and the fact it's aired on FOX are a bit worrying though.We shall see how it does.

author: c4757p
author_rank: Super Contributor
timestamp: July 21, 2013, 08:16:04 pm
content: Quote from: Phaedrus on July 21, 2013, 08:13:47 pmI was hopeful, but my heart sank when I saw the trailer. They're going to ruin it, I promise you.

author: c4757p
author_rank: Super Contributor
timestamp: July 21, 2013, 08:33:17 pm
content: Seth MacFarlane's producing. He has shamelessly admitted to a cynical "give them whatever sells even if I don't like it" attitude (fits right in at FOX), and judging by the nerd ejaculations at the pop-sci websites and the needlessly flashy trailer, I'd say he's continued to do precisely that. What a shame.

author: MacAttak
author_rank: Unknown
timestamp: July 22, 2013, 03:50:33 pm
content: I'm still hopeful, but the trailer is really disappointing.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 22, 2013, 06:24:16 pm
content: +1...However, to c4757p's comment: "'There's never been a more important time for Cosmos to re-emerge than right now. I want to make this so entertaining, and so flashy, and so exciting that people who have no interest in science will watch just because it's a spectacle' said MacFarlane." (source)Let's see how it turns out.

author: free_electron
author_rank: Super Contributor
timestamp: July 22, 2013, 06:30:40 pm
content: nah ! without "Heaven and Hell" from Vangelis it is just not the same ...

author: c4757p
author_rank: Super Contributor
timestamp: July 22, 2013, 06:31:06 pm
content: Oh dear lord. So once again he openly admits to being the McDonalds of entertainment.How sad. Hopefully theotherpeople involved with this don't let him ruin it. There's so much potential here...Quote from: rsjsouza on July 22, 2013, 06:24:16 pmI can sort of see the point of this. There are a lot of people who may just not have realized something could be interesting because they've never seen it presented in an interesting way. But making it generically "flashy" isn't the right way to go about bringing those people in; it might bring them in for a little while, but it cheapens it so much for people who actually try to be engaged with it that it won't last long and they'll just bugger off. As will everybody else who otherwise would have watched it. And you're not going to draw in the "unwashed masses", so to speak, with tactics like this anyway, unless you plan on not making it educational at all.It's such a pathetic, cynical way to view people that you could manipulate them into being interested in science by making it shiny, and it's a pathetic, cynical view of science that it needs that.
NASA Workmanship Reference - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: July 21, 2013, 02:31:53 am
content: http://workmanship.nasa.gov/insp.htmlWasn't there a 'Reference Works' thread somewhere? I though it would have been stickied, but apparently not.I still think it's a shame there are not a few more forum categories, like:* Reference Library.* Old Electronics Restoration Projects.* Hall of Shame (waste, bad designs, etc.)Oh well. Dave's Forum...

author: Unknown
author_rank: Unknown
timestamp: July 21, 2013, 01:14:11 pm
content: I would quite like a hall of shameI've certainly done plenty of things in the past that would've ended up there. Plus, it would be quite good to have an "I made this mistake so you don't have to" sort of category. Highlighting traps for young players by people that actually fell into them.
Northen Illawarra Makerspace - Page 1
Forum section: electronics / general

author: AlfBaz
author_rank: Super Contributor
timestamp: July 19, 2013, 06:31:47 am
content: ... who knew!?Went to jaycar in Wollongong and was given a sticker advertising a local makerspaceHoping they don't mind a mention here. I can't imagine they wouldn't have a "more the merrier" attitude so here are the details for anyone interested
Apollo 11 engine recovered by Bezos Expeditions - Page 1
Forum section: electronics / general

author: Stonent
author_rank: Super Contributor
timestamp: July 19, 2013, 06:41:24 pm
content: http://arstechnica.com/science/2013/07/confirmed-f-1-engine-salvaged-from-ocean-floor-is-from-apollo-11-rocket/QuoteQuote

author: Short Circuit
author_rank: Frequent Contributor
timestamp: July 19, 2013, 08:16:38 pm
content: One of these engines produces enough energy to power 10 DeLorean time travel machines.makes more sense on this forum

author: PeterG
author_rank: Frequent Contributor
timestamp: July 19, 2013, 09:45:48 pm
content: Quote from: Short Circuit on July 19, 2013, 08:16:38 pmHoly cow, thats a lot of energy....

author: ElectroIrradiator
author_rank: Frequent Contributor
timestamp: July 20, 2013, 12:24:55 am
content: How is this for a brain twister: Thefuel turbo pumpon a single Saturn V F1 engine had a rated shaft power of 55'000 HP. Fiftyfive thousand horse power. Just for the fuel pump.

author: PaulAm
author_rank: Frequent Contributor
timestamp: July 20, 2013, 12:44:56 am
content: They're actually revisiting Saturn V technology for future engines.Here's a NASA page with a video of an F1 Gas Generator test done in January this year.One word: awesome!!http://www.nasa.gov/exploration/systems/sls/f1_sls.html#.UenZ03w55aM

author: MacAttak
author_rank: Unknown
timestamp: July 20, 2013, 01:08:22 am
content: In somewhat related news, they did some engine tests in the past few weeks of the J-2X engine being developed for SLS:http://www.planetary.org/blogs/jason-davis/20130718-j2x-distant-dot.htmlImpressive engineering.
Yeah, I'll just go out and get some "Freon TF". - Page 1
Forum section: electronics / general

author: Jebnor
author_rank: Regular Contributor
timestamp: July 18, 2013, 08:27:59 pm
content: Oh, the old days...http://youtu.be/vpgMn88Qfjs?t=4m35s

author: David_AVD
author_rank: Super Contributor
timestamp: July 18, 2013, 10:42:17 pm
content: I remember that stuff from when I worked at a TV repair shop after school in my teens. Got in trouble a few times for leaving the cap off.

author: SeanB
author_rank: Super Contributor
timestamp: July 19, 2013, 06:19:09 pm
content: Still have some R141B around, and it is a great cleaner as well. Buy it in 5l plastic drums as well, or a 20l steel drum. It is now in a disposacan and is pressurised with R22 to clean out burn ups from compressor failures. At least is is less of a carcinogen than the Trichlorethane in the video, though I did use that as a cleaner, magic at cleaning to bare metal. Leave a board in it too long and it becomes copper traces in gel.

author: marshallh
author_rank: Unknown
timestamp: July 19, 2013, 10:40:06 pm
content: Those that were sitting on pallets of R-12 when it was banned made out quite well.R-134a has seen steep increases lately as well. The EPA is trying to get it banned from normal distribution, instead requiring a certification and license. Anything to make themselves feel relevant, I suppose.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 20, 2013, 12:39:18 am
content: Quote from: marshallh on July 19, 2013, 10:40:06 pmAnd ironically, it's pretty easy to find R134a in the form of duster cans and freeze sprays.For cooling stuff, Enviro-Safe is a good alternative to those CFCs and HCFCs. (I have used ES22a in a central unit about 6 years ago, unit still works great last time I checked.) I have no idea how well they work as cleaning solvents, but they carry oil better than the CFCs and HCFCs they replace.
free electronic test program. - Page 1
Forum section: electronics / general

author: anlsoft
author_rank: Newbie
timestamp: July 18, 2013, 08:14:20 pm
content: Try this...http://www.softpedia.com/get/Science-CAD/LTspice-IV.shtmlLTspice IV can help you easily create your own schemes in order to simulate switching regulators.It is a new SPICE that was developed to simulate analog circuits fast enough to make simulation of complex SMPS systems interactive. Incorporated into the new SPICE are circuit elements to model practical board level components.Capacitors and inductors can be modeled with series resistance and other parasitic aspects of their behavior without using sub-circuits or internal nodes. Also, a simulation circuit element was developed for power MOSFET's that accurately exhibits their usual gate charge behavior without using sub-circuits or internal nodes.Reducing the number of nodes the simulator needs to solve significantly reduces the computation required for a given simulation without compromising the accuracy or detail of the switching waveforms.Another benefit of these new simulation devices is that convergence problems are easier to avoid since they, like the board level component the model, have finite impedance at all frequencies.Modern switch mode power supplies include controller logic with multiple modes of operation. For example, devices may change from pulse switch modulation to burst-mode or to cycle skipping depending on the circuit's operation. An original new mixed-mode compiler and simulator were written into LTspice that allows these products to be realistically modeled in a computationally fast manner.But despite LTspice’s close association with SMPS design, it not a SMPS-specific SPICE but simply a SPICE program fast enough to simulate a SMPS interactively.

author: free_electron
author_rank: Super Contributor
timestamp: July 18, 2013, 09:56:12 pm
content: whoop-de-doo. anyone tinkering with electronics knows about that one.. and TINA as well. and why woudl one want to download it form a collector site... just get it directly from linear technologies or TI (for TINA) that way it hasn't been messed with...definition of redundant post : see 'redundant post' or , this topic ...
Sometimes I love ebay - Page 1
Forum section: electronics / general

author: PedroDaGr8
author_rank: Super Contributor
timestamp: July 20, 2013, 05:51:01 am
content: I came across a listing for what looked like metal foil resistors which weren't even listed as resistors. They were listed as electronic components 12-pcs 1PE0707A294R00TN. I was able to determine they were from a company called Wilbrecht (which I had never heard of). Seeing the 294R00 in it made me think it is a resistor. Also, having looked at precision resistors previously, I knew that typically the military designated tolerance code of T corresponds to a 0.01% tolerance. I was already buying some other stuff from this guy* so I decided to take a chance. Initial bid was $9 for twelve of them and I was the only bidder. Just received it today, sure enough they are 294R00 0.01% resistors. Researching further I discovered they are a NASA part. The first bunch unfamiliar digits in the part number was a Goddard Designator (dunno what that is) but the A294R00T was the important part. TheAmeans they are +/- 2.5ppm/oC (the best offered in this brand) the T was, as I suspected, 0.01%. So for less than a dollar a piece I got 12 relatively low ohm value high precision resistors, new and in their individually labelled plastic package.*I ended up getting 25x 630V 0.022uF PP Film caps, 25x weird Wima SMD film caps, 25x R0005 current shunts, 40x 27by27mm heatsinks, 100x gold plated connectors, 77x heatshrink fork crimp connectors, 20x weird dual inductors and the aforementioned resistors.

author: Josephine85
author_rank: Contributor
timestamp: July 20, 2013, 11:44:23 am
content: You're right, i found some great stuff there, too!

author: Stonent
author_rank: Super Contributor
timestamp: July 20, 2013, 08:05:12 pm
content: Goddard Space Flight Centerhttp://www.nasa.gov/centers/goddard/home/index.html

author: PedroDaGr8
author_rank: Super Contributor
timestamp: July 21, 2013, 05:47:46 am
content: Quote from: Stonent on July 20, 2013, 08:05:12 pmThat makes sense. No clue why I didn't put 2+2 together.
A nice explanation of the hall effect. - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: July 21, 2013, 09:26:09 am
content: http://youtu.be/AcRCgyComEw

author: IanB
author_rank: Super Contributor
timestamp: July 21, 2013, 11:06:29 am
content: You can post the video link directly, then we don't have to follow a blind link and guess where it points to.
Cheap 10 turn pots - Page 1
Forum section: electronics / general

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 16, 2013, 07:02:04 pm
content: Are the cheap 10 turn pots from china and hong kong on ebay any good?

author: amyk
author_rank: Super Contributor
timestamp: July 16, 2013, 07:12:54 pm
content: https://www.eevblog.com/forum/chat/bonens-(bochen-also-works-here)-counterfit-bourns-trimpot-analysis/

author: c4757p
author_rank: Super Contributor
timestamp: July 16, 2013, 07:22:06 pm
content: Do you mean the trimmers, or the panel pots? I've had awful luck with the ten-turn trimmers and good luck with the panel pots.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 16, 2013, 07:27:52 pm
content: Whats a panel pot lol

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 16, 2013, 07:30:11 pm
content: a pot that goes on a panel

author: c4757p
author_rank: Super Contributor
timestamp: July 16, 2013, 07:34:17 pm
content: Yes, a pot that goes on a panel.Panel-mount potentiometer:Trim pot:

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 16, 2013, 07:38:28 pm
content: ok thanks, Its a panel type.

author: smashedProton
author_rank: Frequent Contributor
timestamp: July 16, 2013, 10:20:15 pm
content: I second c4757p, the 10 turn panel pot on my psu has took a lot of abuse. I got it from ebay.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 16, 2013, 10:32:01 pm
content: To SmashedProtonWas it a cheap pot?

author: smashedProton
author_rank: Frequent Contributor
timestamp: July 16, 2013, 11:30:22 pm
content: http://www.ebay.com/itm/3590S-2-103L-10K-Ohm-Rotary-Wirewound-Precision-Potentiometer-Pot-10-Turn-/120971089939?pt=LH_DefaultDomain_0&hash=item1c2a705813It was this.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: July 17, 2013, 08:03:25 am
content: that's what I had in mind, thanks.
External triggering of Rigol DS1102E - Page 1
Forum section: electronics / general

author: m12lrpv
author_rank: Regular Contributor
timestamp: July 17, 2013, 06:18:55 am
content: I'm looking to use the external trigger on my DS1102e and cant seem to find any info on it apart from the "Trigger Level Range" of +/- 1.2VI find it difficult to believe that + 1.2V is the maximum voltage limit for the input and feel that it's just the range at which I can adjust the triggering point.My novice paranoia with scopes has me reluctant to just hook up my project's 5v square wave to trigger off without getting confirmation that it's safe (although seriously I feel retarded for even asking)Any assistance would be much appreciated.EDIT: Don't worry. I got home and realised it is clearly marked as having the input parameters of the other inputs so I have nothing to worry about triggering from any circuit I do (all low power)
Cool kickstarter project: RC spider tank - Page 1
Forum section: electronics / general

author: MadModder
author_rank: Regular Contributor
timestamp: July 16, 2013, 06:55:53 pm
content: A remote controlled toy spider tank with weapons and stuff. In a kit. Yes, soldering is required!By a crazy dude living in the woods.I want a kit!He only needs 5000 backers...http://www.kickstarter.com/projects/1089105581/the-greatest-toy-kit-in-the-universe-spider-tank-m

author: dr.diesel
author_rank: Super Contributor
timestamp: July 16, 2013, 06:59:55 pm
content: How about a Kickstarter for his giant walking robot? Imagine hundreds of those walking around!

author: MadModder
author_rank: Regular Contributor
timestamp: July 16, 2013, 07:39:40 pm
content: That would be cool. But quite expensive to ship...
great dumpster diving place without the dumpsters - Page 1
Forum section: electronics / general

author: the nerdling
author_rank: Newbie
timestamp: July 14, 2013, 09:09:16 am
content: here in Katoomba there is a tip and in that tip there is a wonderous place know to some people(probably all people) as "the recycling shed.me + my bros found many computers there:4gb ram, 1tb hard drive, 3ghz, 2gb graphics, HUGE cooling, antec casehp media computerlaptops chargers batteries hard drives wifi routers power supplies flat screen tv practically anything you can think ofbut yout not allowed to takje electronics. so be sneaky

author: Spunky
author_rank: Regular Contributor
timestamp: July 16, 2013, 12:18:35 am
content: I know the guy who runs our local tip, I've had TVs, car CD players and various other stuff, but all the really nice stuff he keeps himself. His whole house looks like a PC and electronics showroom, as well as all the high end domestic appliances.Most of it gets chucked because people don't know their stuff has a fuse in it

author: G7PSK
author_rank: Super Contributor
timestamp: July 16, 2013, 08:35:46 am
content: Not there now of course, but when I was a kid in the 60's I was allowed along with a few others access to PYE electronics dump on Coldhams lane Cambridge. I found al sorts of wondrous things on that pile, if it was not up to spec or did not work or jus surplus it was dumped in a pile at the back of the factory and when the pile got too big it was hauled of somewhere. I had things like microwave horns and guides Rotary converters transistors even whole transceiver's some of the stuff was still in its packaging when I got it. I still have an unused rotary converter (other than the few second I have run it to test) that I picked up still in its box, they were used for the HT supply in mobile transmitters in the 1950's to early 1960's.
What pitch are these? - Page 1
Forum section: electronics / general

author: Things
author_rank: Regular Contributor
timestamp: July 13, 2013, 10:00:12 am
content: Hi guys, trying to do a bit of work in my laser cutter, popped the side panel open and found they haven't included the extra terminals! Damn!I have seen these before, they're those removable terminal block thingies - but the odd thing with these is they're teeny! Not like the huge 5.08mm pitch ones.Does anyone know what to look for for the smaller ones? I tried 2.54mm pitch but didn't really get anything?Dan

author: David_AVD
author_rank: Super Contributor
timestamp: July 13, 2013, 10:11:51 am
content: 3.5mm and 3.81mm (0.15") are the most common of the smaller types. Even a steel rule is good enough to measure the pitch.

author: digsys
author_rank: Unknown
timestamp: July 13, 2013, 10:16:31 am
content: For a long time, they were more common in 0.15" (3.81mm), then as metric took hold 3.5mm is becoming more common,especially in new stuff. Most the industrial stuff I use still uses imperial. They DON'T interconnect, so get it right. Altronics / Jaycar etcall have them (plus RS, Farnell etc etc)

author: Things
author_rank: Regular Contributor
timestamp: July 13, 2013, 10:44:59 am
content: All these bloody odd sizes! Thanks guys

author: peter.mitchell
author_rank: Super Contributor
timestamp: July 13, 2013, 11:44:22 am
content: grab some bootlace crimps (ferrules) while you're there too.

author: David_AVD
author_rank: Super Contributor
timestamp: July 13, 2013, 12:22:15 pm
content: Quote from: peter.mitchell on July 13, 2013, 11:44:22 amWe bought a heap of ferrules from Altronics, but got the tool (hex crimp shape) from eBay for about $50 I think. They sure do make wiring into terminals neat.

author: nctnico
author_rank: Super Contributor
timestamp: July 13, 2013, 06:50:36 pm
content: Ferrules are a must have! When visiting a customer a few weeks ago I encountered a machine with tinned strands under screw terminals. Yikes!I thought it would be well known by now that such practise is a real fire hazard.

author: David_AVD
author_rank: Super Contributor
timestamp: July 13, 2013, 11:08:40 pm
content: Regarding the 3.5mm pitch connectors, I've found that different brands are not always interchangeable.We tend to use locally sourced ones (Sanhe Contact), but found the plugs don't fit properly into the sockets on some (3rd party) Chinese assembled boards we bought.Without a 3rd brand for comparison I really don't know which one is not "standard".

author: notsob
author_rank: Frequent Contributor
timestamp: July 13, 2013, 11:21:03 pm
content: Phoenix Contacts make a massive range, have a look at their products to see if you can find a matchhttp://www.phoenixcontact.com/index.php
OT: Star Wars Downunder - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 18, 2013, 12:56:33 am
content: Normally wouldn't post, but a lot of people love Aussie things, and well, this is star wars, and well, it's awesome!http://swdufanfilm.com/http://vimeo.com/65355628#

author: digsys
author_rank: Unknown
timestamp: July 18, 2013, 01:14:32 am
content: EXCELLENT workmanship .. pity some of the dialogue is hard to "hear". It sure would've been a whole different outcome if aussies wereleading the rebels ... or running the death star !!! ... beer fridges ... footy nights ... :-)

author: EEVblog
author_rank: Unknown
timestamp: July 18, 2013, 01:16:21 am
content: Quote from: digsys on July 18, 2013, 01:14:32 amI got that feeling too, it just didn't seemed to be mixed the best it could be.

author: Psi
author_rank: Super Contributor
timestamp: July 18, 2013, 02:31:07 am
content: Yeah, needs to be remixed but other than that its really well done.I've seen this sort of effect before, it happens when people do the editing/mixing on generic speakers.Generic (cheap) speakers have a frequency response which is all over the place with peaks/dips that are totally different to other generic speakers.So you end up mixing it perfectly for playback on the speakers your using which results in bad quality on other speakers.To mix properly it has to be done using studio quality speakers with a flat response so you get some degree of replay quality.

author: c4757p
author_rank: Super Contributor
timestamp: July 18, 2013, 11:03:00 am
content: Brilliant.

author: 4to20Milliamps
author_rank: Regular Contributor
timestamp: July 18, 2013, 11:40:14 am
content: Forget the lightsaber I want a laser boomerang.Awesome.

author: Vgkid
author_rank: Super Contributor
timestamp: July 18, 2013, 04:35:59 pm
content: Awesome, they have put alot of effort into that. There were only a few words that I had issues hearing.

author: free_electron
author_rank: Super Contributor
timestamp: July 18, 2013, 05:48:05 pm
content: Luke Bushwhacker. bwahahaaaaUse the Foster's luke ...
Breadboards - Page 1
Forum section: electronics / general

author: romovs
author_rank: Contributor
timestamp: July 13, 2013, 07:32:39 am
content: Up until recently I was prototyping most of my thru-hole projects using prototype panels and completely ignored breadboards.Not that I have anything in particular against them.., it's just this breaboard thing completely skipped over me for some reason.So I recovered one from the depths of my junk box and gave it a try.Now I have mixed fillings about this.On one hand it doesn't require soldering, so it's easier to replace components (let's ignore the stuff requiring adapters for now).On other, the process of transferring circuit/layout to a breadboard is somewhat cumbersome in my opinion, as it's usually ends up looking dissimilar to the initial board layout. At least twice now I spent time hunting for a wrong connection just because a component was mirrored or placed in different direction due to board constrains.As as remedy, I was thinking it could be nice to have a software which can produce a compatible breadboard layout from supplied schematic + pcb layout.Since this seems like a rather involved project, and I am, well... lazy, it might never come to fruition.But... what do you fellas think? Is this something that might be useful or maybe I am just overcomplicating things?And also what's you preferred way of protyping with breadboard, schematics -> breadboard or pcb layout -> breadboard?p.s. i am referring to single layer layouts only.

author: sleemanj
author_rank: Super Contributor
timestamp: July 13, 2013, 07:45:21 am
content: Quote from: romovs on July 13, 2013, 07:32:39 amBe sure to have a look atFritzing1before you go too far down the path there, not "autorouted" like you are talking about, but it does allow you to draw a schematic (or directly layout a pcb) and then transfer that to breadboard, or vice-versa, so it could perhaps provide a base to work from or some ideas at least.1Before we get various posters with guffaws of laughter, Fritzing is an educational tool, not a professional one, do not compare it to your favourite design tool... it's not what it is trying to be.

author: romovs
author_rank: Contributor
timestamp: July 13, 2013, 08:31:32 am
content: LOoks like an interesting project.Thanks sleemanj.
Farewell blog entry from a senior analog engineer - Page 1
Forum section: electronics / general

author: rsjsouza
author_rank: Super Contributor
timestamp: July 11, 2013, 11:12:50 pm
content: I found this farewell blog from Bruce Trump (ex Burr Brown, TI) very interesting.http://e2e.ti.com/blogs_/b/thesignal/archive/2013/06/25/knowing-where-to-tap.aspx

author: DenzilPenberthy
author_rank: Frequent Contributor
timestamp: July 12, 2013, 09:41:36 am
content: Nice little goldmine of good articles there, ta!
dI/dt  ?   math error?   - Page 1
Forum section: electronics / general

author: J4e8a16n
author_rank: Regular Contributor
timestamp: July 11, 2013, 09:45:58 pm
content: Hi,I checked an integration 'error?' in my book . See the red ! .Unfortunately the book is in french. Anyhow . . .

author: c4757p
author_rank: Super Contributor
timestamp: July 11, 2013, 09:56:58 pm
content: Yeah, should be -1/3 ln |5-I|. Somebody missed a factor of three...In my experience you don't usually make it far into a textbook with a bunch of math before you find an arithmetic error. Maybe my school just picks shitty books, though...

author: IanB
author_rank: Super Contributor
timestamp: July 11, 2013, 10:13:14 pm
content: Hmm? Let's work it backwards:f(I) = -1/3 ln(15 - 3I)Let u = 15 - 3I, then df/dI = (df/du)(du/dI), wheref(u) = -1/3 ln uSo:df/du = (-1/3)(1/u)du/dI = -3df/dI = (-1/3)(1/u)(-3) = 1/u =1 / (15 - 3I)Which is what the book has.So what did I get wrong?

author: c4757p
author_rank: Super Contributor
timestamp: July 11, 2013, 10:27:46 pm
content: Actually, you're right, thank you!The catch here is that we came to different answers through different methods, butboth are correctbecause of the constant that is being ignored.ln(5 - i) = ln(15 - 3i) - ln(3)And ln(3) is of course a constant.(I used a lowercase i for legibility)Kind of ashamed I missed that, I used to grade math papers...

author: J4e8a16n
author_rank: Regular Contributor
timestamp: July 12, 2013, 02:43:43 pm
content: Why not that way?integration sign ((1/ (15-3i) ) dI) =ln|(1/ (15-3i) | =-ln|(15-3i) | =-|15-3i| = e^(t-C)and be stuck with no 1/3 :-/

author: IanB
author_rank: Super Contributor
timestamp: July 12, 2013, 03:05:39 pm
content: Quote from: J4e8a16n on July 12, 2013, 02:43:43 pmBecause your working is wrong at the line indicated in red. The antiderivative of 1/x is ln x, and you are missing a factor of (-1/3):http://www.wolframalpha.com/input/?i=integrate+1%2F%2815-3i%29+di

author: J4e8a16n
author_rank: Regular Contributor
timestamp: July 12, 2013, 04:36:32 pm
content: substitute u = 15-3 idu/di = 0-3and du = -3 di:du/-3 = di1/-3 *du = diok-1/3 log(15+3i)) constant = t- C-1/3 log(15+3i)) = t- (C +constant)log(15+3i)) =-3( t- C)...Why Wolfgang say?Substitute back for u = 15-3 i: = -1/3 log(-3 (-5+i))+constantWhich is equivalent for restricted i values to:Answer: || = -1/3 log(5-i)+constant

author: IanB
author_rank: Super Contributor
timestamp: July 12, 2013, 04:44:24 pm
content: Quote from: J4e8a16n on July 12, 2013, 04:36:32 pmBe careful with your signs. In several places there you have changed a "-" into a "+". If you do that in a real problem you will lose marks in a test, or build something that doesn't work the way you expect...

author: KJDS
author_rank: Super Contributor
timestamp: July 12, 2013, 05:22:36 pm
content: For a long time, almost every paper and book I read had errors in the equations, probably so that those who don't understand the maths can't make use of them.
info - Page 1
Forum section: electronics / general

author: peterthenovice
author_rank: Regular Contributor
timestamp: July 11, 2013, 12:11:31 am
content: what info would you like to have in a laminated sheet for reference if you could put any thing on it.

author: Short Circuit
author_rank: Frequent Contributor
timestamp: July 11, 2013, 12:53:57 am
content: stretching exercises for the gym

author: Rerouter
author_rank: Super Contributor
timestamp: July 11, 2013, 08:24:10 am
content: all the relevant equations for magnetic and ac phase / power with the values defined with units,

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: July 11, 2013, 11:34:17 am
content: I have a bookmark collection of references like these broken down by category. Makes it easy to locate "the best" when I need a reference.The one laminated reference I do keep on hand has a drawing of the microcontroller circuit board I use for most of my projects with the port pins for every connector pin, LED and switch called out.One handy thing on the back side, a table showing the limits for each variable type.

author: madires
author_rank: Super Contributor
timestamp: July 11, 2013, 12:34:31 pm
content: Quote from: Jon Chandler on July 11, 2013, 11:34:17 amWith most compilers you'll get the min and max values as predefined constants in the header/include files. Just saying :-)

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: July 11, 2013, 02:40:01 pm
content: Quote from: madires on July 11, 2013, 12:34:31 pmWell, I definitely don't know aboutmost compilers– you must be a busy guy to know about so many different languages and all of the various versions to make such a statement.It's something I find handy; others may or may not find it useful.
PnP supply protection [Guess the function of following scheme] - Page 1
Forum section: electronics / general

author: Memphis
author_rank: Contributor
timestamp: July 15, 2013, 03:08:28 pm
content: So guess/examine/explain the usage of the following scheme:

author: hlavac
author_rank: Frequent Contributor
timestamp: July 15, 2013, 03:42:47 pm
content: Ummm, failed attempt at a synchronous rectifier?

author: Memphis
author_rank: Contributor
timestamp: July 15, 2013, 03:52:31 pm
content: Quote from: hlavac on July 15, 2013, 03:42:47 pmActually it works as it is... it is not a synchronous rectifier but you are very close to the main function

author: free_electron
author_rank: Super Contributor
timestamp: July 15, 2013, 03:59:40 pm
content: lossless rectifier. the mosfets short their internal bulk diodes so you don't lose 1.2 volt per alternance.

author: Memphis
author_rank: Contributor
timestamp: July 15, 2013, 04:05:03 pm
content: Quote from: free_electron on July 15, 2013, 03:59:40 pmTrue, it disallow reverse polarity, and it does one more, very important job.

author: hlavac
author_rank: Frequent Contributor
timestamp: July 15, 2013, 04:18:14 pm
content: Quote from: Memphis on July 15, 2013, 04:05:03 pmSo its protection circuit for DC power adapter input that protects from reverse polarity and overvoltage?That could be said about the left side, what about the right side?

author: Memphis
author_rank: Contributor
timestamp: July 15, 2013, 04:32:34 pm
content: Quote from: hlavac on July 15, 2013, 04:18:14 pmThe right part prevents current flowing when only positive polarity is connected to the left part and ground from right part is connected for example via signal cable to power supply. So it is some kind of Plug&Play supply. The "PnP bridge" will be opened only if both negative and positive polarity is connected on left side.This is very useful when you have lazy technician which connects/disconnects everything under the powered source, it will save you signal/bus drivers.So it is much better than the simple diode and also a cheap solution.
Ardo Electric Cooker odd behaviour - Page 1
Forum section: electronics / general

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 06, 2013, 04:01:40 pm
content: The firmware is not well implemented. I have never seen this on similar digital household product (like microwave oven or so.)This Ardo cooker is type6PA40 EE.

author: SeanB
author_rank: Super Contributor
timestamp: July 06, 2013, 05:04:25 pm
content: Code monkey - I need the code to work so we can ship... I need more time to get the bugs out......No time, we ship next week and the code needs to be done by tomorrow morning..... What about bugs?.... As long as the clock runs and the timer works who cares, get on it code monkey!...... I am going to need a case of red bull and a case of coffee then

author: romovs
author_rank: Contributor
timestamp: July 06, 2013, 05:09:50 pm
content: Reverse engineer the eeprom to fix multi key press issue and send the patch back to Ardo. Along with the oven

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 06, 2013, 08:26:44 pm
content: Quote from: romovs on July 06, 2013, 05:09:50 pmWell, the heating elements are OK.The whole digital timer can be eliminated when necessary... The oven has an oldschool mechanical turnable switch, too.

author: tom66
author_rank: Super Contributor
timestamp: July 06, 2013, 09:25:38 pm
content: My guess is they multiplex the buttons with the VFD and heater control, I wonder why.

author: SeanB
author_rank: Super Contributor
timestamp: July 07, 2013, 05:02:21 am
content: Saves pins on the micro, they probably did not want to step up to a bigger more expensive ASIC as then they would have to pay more for both silicon and the high voltage processing steps ( VFD needs a 30V process to drive it) and would have a lot of unused expensive blocks unused.

author: IanB
author_rank: Super Contributor
timestamp: July 07, 2013, 05:40:10 am
content: The worst problem is that such faults occasionally cause the oven to latch on full power and burn the kitchen down. It happens when the designers put the temperature control loop in the digital side instead of having an analog or electromechanical thermostat.

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 07, 2013, 10:03:02 am
content: Fortunately, my oven is semi-mechanical. The microprocessor can only turn off the heating element, when somebody turns it on. There is a true mechanical thermostat. The oven is not smart, it only has a timer.

author: Psi
author_rank: Super Contributor
timestamp: July 07, 2013, 10:09:50 am
content: Why does the autofocus motor on your camera sound like its from the 1950's

author: SeanB
author_rank: Super Contributor
timestamp: July 07, 2013, 12:02:10 pm
content: DSLR with built in microphone does that. You need an external microphone to get the noise down.

author: envisionelec
author_rank: Frequent Contributor
timestamp: July 07, 2013, 08:53:28 pm
content: Quite a cacophony of cool noises.I hear a dance remix in the near future.
Bunnies Openhardware Laptop  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: July 06, 2013, 08:25:47 pm
content: bunnies effort to build a complete open hardware laptop, called the Novena. bunnie has now posted a progress report on the laptop's design and construction very interestinghttp://www.bunniestudios.com/blog/?p=3265
I Discovered A New Fix It Guy - Maxxarcade - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: July 07, 2013, 09:26:33 am
content: Greetings EEVBees:--I am always trying to find out how to fix things. Dumpster diving, and friends and family provide me with a lot of stuff that I can repair or part out on eBay. Whatever I cannot sell, I donate to friends and family, or to Goodwill, or churches. I also donate 10% of all eBay sales to the Marine Corps and Law Enforcement Foundation, which helps with education expenses for children of the fallen. EBay has a number of good charities that you can donate to. I watch all of Dave's videos for repair tips and for general learning, I also watch NORCAL715 who fixes TV and appliances. I just discovered Maxxarcade (Link Below) who fixes amplifiers and many other things. The reason I recommend these fellows is, like Dave they make really really clean and audible videos. I know we are all tired of incoherent mumblers, with bad lighting, bad sound recording, and a $20 dollar camera shooting the back of their hand or the corner of the table, sheesh.https://www.youtube.com/user/Maxxarcade/videos"Don't give up the ship"Captain James Lawrence USN 1781 - 1813Best RegardsClear Ether

author: mariush
author_rank: Super Contributor
timestamp: July 07, 2013, 10:52:04 am
content: Subscribed since a long time ago... he has great audio amplifier repair videos, learned quite a bit from him.
For anyone in the Portland (OR) area... - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: July 05, 2013, 10:21:20 pm
content: Surplus Gizmos (NW Cornelius Pass Rd. just north of US 26 in Hillsboro) is having a one day sale tomorrow (Saturday). 50% off all surplus items, 10% off other items, selected items excluded, but I know them, they'll make it worth your while. You should come by and see what kind of deals you can get.(I don't work for them, though I think that'd be fun, I'm just an addict!)

author: SeanB
author_rank: Super Contributor
timestamp: July 06, 2013, 04:48:40 am
content: Bit far to fly there........

author: Unknown
author_rank: Unknown
timestamp: July 06, 2013, 05:09:34 am
content: I know that's at least one other member in this general area, and who knows how many more, so I thought I'd post it just in case someone was interested.

author: smashedProton
author_rank: Frequent Contributor
timestamp: July 06, 2013, 05:26:21 am
content: If only I saw this post earlier. I was down by the Lewis-mccord military base earlier Yesterday and this morning for the 4th. I was within as couple hours

author: Unknown
author_rank: Unknown
timestamp: July 06, 2013, 05:28:09 am
content: I didn't even know about it until around noon or so.You're still within three hours.