hybridfree/eevblog-posts huggingface dataset:
[News] China Embargos Rare Earth Exports To Japan - Page 1
Forum section: electronics / general

author: jpwack
author_rank: Contributor
timestamp: September 24, 2010, 06:24:38 pm
content: I don't know how many of you read Slashdot (or stumbled upon this news early):http://politics.slashdot.org/story/10/09/23/2035200/China-Embargos-Rare-Earth-Exports-To-JapanThis includes raw semiconductor materials? how seriopus can be this situation?Cheers

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 25, 2010, 10:43:20 am
content: i'll wait whats my local news will say about it. for now, i hope i still can get silicon and "rare low melt solder" from ebay or other international supplier.

author: Neilm
author_rank: Super Contributor
timestamp: September 25, 2010, 01:22:21 pm
content: That could get worring for the hybrid car market. China has some of the very rare elements required for the batteries.Neil

author: Zero999
author_rank: Super Contributor
timestamp: September 25, 2010, 01:28:49 pm
content: I thought it was for rare earth magnet motors, not batteries.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 25, 2010, 02:17:32 pm
content: We have also an recent thread about this subject ... here ..https://www.eevblog.com/forum/index.php?topic=1156.0

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 25, 2010, 02:33:59 pm
content: Quote from: Kiriakos-GR on September 25, 2010, 02:17:32 pmi think this one is quite a different issue which occured later. the quota cut occured earlier, this one happened only when their fisherman "slashed" 2 boats of japanese law enforcer and get jailed.this new issue may lead to a mass destruction war between China & Japan. Maybe China want to revenge from the past history of "Japanese Massacre". I dont know

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 25, 2010, 06:07:50 pm
content: They just need to clear up things about their border lines , its logical and it must happen , so to not be an open wound in the future ..Same story like Greece Turkey and Cyprus , this maters they must to clear out , once and for good.
Wear the colors! - Page 1
Forum section: electronics / general

author: PetrosA
author_rank: Frequent Contributor
timestamp: September 10, 2010, 09:57:15 pm
content: I decided to have some fun and turn the (as yet unaccepted) logo that I designed into a Firefox persona. If you use Firefox and want it, you can get it here:http://www.getpersonas.com/en-US/persona/293005

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 10, 2010, 10:03:25 pm
content: I use the Noia 2.0 theme for about an year , and I prefer it more than Firefox persona themes .It all about mater of taste .https://addons.mozilla.org/en-US/firefox/addon/72/

author: migsantiago
author_rank: Frequent Contributor
timestamp: September 11, 2010, 12:41:29 am
content: Quote from: PetrosA on September 10, 2010, 09:57:15 pmThat logo looks great! I wonder why Dave hasn't chosen a definitive one.

author: PetrosA
author_rank: Frequent Contributor
timestamp: September 11, 2010, 03:14:02 am
content: Quote from: migsantiago on September 11, 2010, 12:41:29 amThanks. Choosing a logo is a huge step and not one to be taken lightly, especially when something like EEVBlog grows at the pace that it has. A logo will become the defining stamp of the website and brand and I'm sure Dave will do his homework before making a final decision.

author: ElektroQuark
author_rank: Unknown
timestamp: September 11, 2010, 06:50:02 am
content: I am sure He is evaluating all the proposed logos.It is not an easy task, He must maximize the EEVBlog potential

author: Zero999
author_rank: Super Contributor
timestamp: September 11, 2010, 08:36:30 am
content: I've always been an Opera fan.Don't get me wrong, Firefox is good, I just prefer Opera because it has built-in features I use which are only implemented on Firefox with extensions that can be buggy, slow Firefox down and don't always work with newer versions.I think Opera has better theming than Firefox but I don't us it. I just have it set to use the same theme as Windows because I prefer all the programs I use to look similar.For me, the only advantage Firefox had was Adblock but then Opera implemented it too, albeit not so well (no subscription to a site which keeps a list of annoying adverts which is updated regularly but a list which you need to keep up to date yourself) but that doesn't bother me as long as I can block the annoying adverts on a certain site I use. I have no problem with advertising in general and think it's good for webmasters to recoup their server charges without having to make people pay to use their site but content links (annoying pop ups which appear when the mouse is moved over certain pieces of text), large animated flash objects and irritating sound effects just push me to use Adblock.
Ever just have one of those days? - Page 1
Forum section: electronics / general

author: ThunderSqueak
author_rank: Unknown
timestamp: September 09, 2010, 12:07:01 am
content: Yes, today was one of those days, I was sitting at work fixing mainboards for a train computer system and I needed a break, ... the wires all were crossed... or my eyes were, I still cannot tell.To take a break I decided to play with my monitor a bit... this is the result

author: TopherTheME
author_rank: Regular Contributor
timestamp: September 09, 2010, 03:18:25 am
content: haha, for a second I thought you just smashed out the screen and just had the monitor frame.

author: Zero999
author_rank: Super Contributor
timestamp: September 09, 2010, 07:55:37 am
content: Hide all the desktop icons and the task bard and it'll look even more effective.

author: McPete
author_rank: Regular Contributor
timestamp: September 09, 2010, 09:17:37 am
content: In answer to the question; I end up with a lot of "Those" daysIn relation to the photo; That's very silly, but very clever. The best of both worlds!

author: Rhythmtech
author_rank: Regular Contributor
timestamp: September 09, 2010, 04:51:27 pm
content: Cool! that's totally one of those "I wish I would have thought of that"

author: Simon
author_rank: Unknown
timestamp: September 09, 2010, 04:56:06 pm
content: hehe very good for a moment i assumed you had a screenless frame

author: DJPhil
author_rank: Frequent Contributor
timestamp: September 09, 2010, 05:06:44 pm
content: Now all you need is a screen saver that preserves the desktop background, perhaps something with a moth flying around?I can see it now, "Oh god, there's a spider building a web on your monitor!"

author: ThunderSqueak
author_rank: Unknown
timestamp: September 09, 2010, 05:30:21 pm
content: Quote from: DJPhil on September 09, 2010, 05:06:44 pmLOL that would be awesome

author: Neilm
author_rank: Super Contributor
timestamp: September 10, 2010, 05:48:51 pm
content: There was a screen saver kicking around a few ago that sat there quite happy for a little while - then put up a window blue screen of death.(with genuine possibility for the error code). Then it rebooted and sat there for a little while before repeating.I did teach someone to lock his machine when he left it with that.
One for the Aussies; Electronex - Page 1
Forum section: electronics / general

author: McPete
author_rank: Regular Contributor
timestamp: August 24, 2010, 07:24:41 am
content: G'day all,One of the tradesmen at work today mentioned an electronics show on in Sydney in early September- Electronex. He's talking to our managers to see about a few people from our section going along- Are any of the EEVBlog crowd planning to attend? I probably won't get to attend (3rd year apprentice= low on pecking order), but on the off chance that I can make it, I'd like to meet a few of you folk, given the chance.Here's the website;http://www.electronex.com.au/Thanks!P.

author: EEVblog
author_rank: Unknown
timestamp: August 24, 2010, 09:03:24 am
content: I forgot to mention it on today's TheAmpHour, but tweeted it the other day.I'll be there, with camera.Dave.

author: cksa
author_rank: Regular Contributor
timestamp: September 08, 2010, 10:59:33 pm
content: Anyone else going today? I will be heading there soon...

author: cksa
author_rank: Regular Contributor
timestamp: September 09, 2010, 06:52:18 am
content: I BUMPED INTO DAVE!

author: McPete
author_rank: Regular Contributor
timestamp: September 09, 2010, 09:14:39 am
content: I missed out, and so did everyone else in our department, I think. I had TAFE, and there's a crazy amount of work on. It just got forgotten! How was it?

author: EEVblog
author_rank: Unknown
timestamp: September 09, 2010, 09:52:55 am
content: Quote from: cksa on September 09, 2010, 06:52:18 amYou did indeed, and I have video footage!Thanks for stopping and having a chat.Ran into quite a few people today!I was hoping to get some good footage of the event, but I ended up spending all my time yapping away to people instead of filming, but I do have some stuff I'll upload.Dave.

author: Simon
author_rank: Unknown
timestamp: September 09, 2010, 11:50:44 am
content: Quote from: EEVblog on September 09, 2010, 09:52:55 ammaybe you can show us some of your meets, it must be a rare thing for a forum user to meet it's creator and growingly famous engineer
Digikey finally get Sort by Price - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 07, 2010, 08:54:59 am
content: At long last Digikey have fixed about the only thing that was wrong with their otherwise excellent search and now have sort by price.Not only that but they've done what I've been asking Farnell to do for ages - sort by price at a specific quantity, taking into account price breaks and stock available.

author: EEVblog
author_rank: Unknown
timestamp: September 07, 2010, 09:44:43 am
content: I don't see it.Dave.

author: Unknown
author_rank: Unknown
timestamp: September 07, 2010, 10:49:26 am
content: Don't see it either. The GreasemonkeyDigikey Sort By Pricescript fixed that problem a long time ago, although it is embarrassing that they don't have it on their site.

author: Simon
author_rank: Unknown
timestamp: September 07, 2010, 11:49:13 am
content: well they still won't get my custom until they lower UK prices

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 07, 2010, 01:37:03 pm
content: You need to be logged in.Info here

author: Zad
author_rank: Super Contributor
timestamp: September 07, 2010, 04:00:18 pm
content: Woohooo at last!I was struggling with it yesterday, trying to track down some parts. I gave up in frustration. One thing I wish they would all do, is to add a price range.As an aside, what on earth happened to supplies of the AD8343 RF/IF mixer? Nobody seems to have any stocks at all, not even Analog Devices themselves. Arrow claim to have, then tell you it s a 5 week lead time. Time to drop AD an email I think.

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: September 07, 2010, 04:06:03 pm
content: On a (somewhat) related note ...I noticed today that findchips.com has added Farnell and Element14 to their searches.Interestingly, they seem to have dropped Jameco.http://www.findchips.com/

author: Simon
author_rank: Unknown
timestamp: September 07, 2010, 04:21:57 pm
content: I thought they always had Farnell but then I've only used them lately, I've found that in the UK Farnell are the cheapest and RS come about the same but you have to pay postage and they don't do as much stuff
[Australia] eBay mobile happy hour next week = cheap things - Page 1
Forum section: electronics / general

author: johnboxall
author_rank: Unknown
timestamp: September 16, 2010, 12:02:49 pm
content: See here:http://pages2.ebay.com.au/happyhourHalf-price on eBay if you buy through their mobile application and pay with the Paypal application, up to $50 refund.Works on crackberry, apple i-things, and Android.Although eBay is riddled with counterfeit crap, there are some sellers that are quite good. For example, I get my LCD modules fromhttp://myworld.ebay.com.au/sureelectronics/.have funjohn

author: Hypernova
author_rank: Unknown
timestamp: September 16, 2010, 12:55:20 pm
content: *Stare at his ancient Nokia with B&W LCD*Ahhhh fuck......

author: Mechatrommer
author_rank: Super Contributor
timestamp: September 16, 2010, 01:35:30 pm
content: i bought things from sureelectronics too! multiple times. they are good, i think, but still not complete. its like they scattered around the world and got different names, sureelectronics1, sureelectronics2 etc, but i believe they will always send products from China.

author: johnboxall
author_rank: Unknown
timestamp: September 17, 2010, 01:25:52 am
content: Quote from: shafri on September 16, 2010, 01:35:30 pmYep, made in China. All I can say is their LCDs have been very good, they ship from Singapore so postage is fast.
Can a DS1102E be converted to a DS1102CA with just firmware? - Page 1
Forum section: electronics / general

author: PeterG
author_rank: Frequent Contributor
timestamp: September 07, 2010, 04:40:24 am
content: The main difference between the two is, the CA model can be connected to a Rigol Function Gen to send a signal from the DSO to the FG directly for the FG to reproduce. I am wondering if this is a simple firmware change or if there is some sort of hardware involved.Both models have USB connections.RegardsPeter

author: DJPhil
author_rank: Frequent Contributor
timestamp: September 07, 2010, 04:56:27 am
content: From what I've read you'd definitely need hardware. Tequipment.net sells thereplacement daughter board(I think that's what it is) for about $375US.There's some details buried here somewhere, I think someone was working on tinkering with the board.The short version as I remember it is that requires hardware and is somewhere between way too much trouble and impossible depending on your interest.

author: PeterG
author_rank: Frequent Contributor
timestamp: September 07, 2010, 05:07:26 am
content: Where would the extra hardware come in? I know it is almost impossible to add an Logic Analyser to an E class model due to the extra hardware. I cant see where the extra hardware comes in for the CA version which does not have a Logic Analyser?Regards.
Don't turn it on - take it apart! Then turn it on... - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 29, 2010, 11:11:41 pm
content: This thread was inspired by the following picture:That's an iPod taken apart and laid out on a sheet of paper, then turned on. The result is the interesting image you see above.Here's a LCD monitor:There is something that looks wrong in the picture but isn't, can anyone guess what it is?And feel free to post more interesting pictures of devices that are turned on after taking them apart.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 29, 2010, 11:36:39 pm
content: Its an laptop LCD connected with some sort of TV game .

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 30, 2010, 04:10:20 am
content: Nope, that's a 22" desktop S-MVA LCD.

author: armandas
author_rank: Frequent Contributor
timestamp: August 30, 2010, 07:45:19 am
content: Probably not that interesting, but just for the record

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 30, 2010, 11:02:55 am
content: More here

author: Rhythmtech
author_rank: Regular Contributor
timestamp: August 30, 2010, 08:45:33 pm
content: Quote from: NiHaoMike on August 29, 2010, 11:11:41 pmIt has a TV tuner?

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 31, 2010, 02:23:47 am
content: Quote from: Rhythmtech on August 30, 2010, 08:45:33 pmThat is one of the few monitors to have an integrated ATSC/QAM tuner, but that's not what I'm looking for.Those who have taken apart a LCD monitor or laptop screen before will notice something that looks out of place.

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 02, 2010, 03:34:10 am
content: Hint: that monitor doesn't have something that most LCD monitors do (apart from a case, of course), but it works fine without it.

author: McPete
author_rank: Regular Contributor
timestamp: September 05, 2010, 10:53:33 am
content: Idle observation here, but I'm not seeing a power supply large enough (I'd have thought) to drive a largish monitor. That wouldn't be it, would it?

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 05, 2010, 03:59:12 pm
content: Quote from: McPete on September 05, 2010, 10:53:33 amIt's 12V input, external power supply. And it only draws about 1.2A, although the included power supply is rated to 5A for some reason.

author: thedigitalprincess
author_rank: Contributor
timestamp: September 07, 2010, 03:26:45 am
content: Rather not turn it on, but I found this failure on the street. It used to be an N97, so anyone interested in turning this on, let me know o.0 I keep it in my pencil case for good luck kinda.
I designed a new logo for the EEVblog. - Page 1
Forum section: electronics / general

author: CompChris
author_rank: Newbie
timestamp: September 04, 2010, 10:30:30 pm
content: Hello David and the EEVblog community. I've been a long time watcher of the EEVblog, and have really enjoyed shows. I noticed that a logo contest was posted a few months ago, but I don't know if anything came out of it. I designed a logo for the blog myself. It may or may not be what you're looking for, but I gave it a shot anyways. David, if you like it and can use it, I'll email you the source files free (why? I like the blog a lot, and have learned quite a bit from the videos (Thanks!). I fully designed the logo in Adobe Illustrator, it's one colo(u)r, so it should go well on any background. It's also a full scalable vector, so it can be resized to as large as needed or be used in printing. It incorporates a screwdriver (the mentality of not "turn it on, take it apart.").Here is a sample image that shows the logo and some different scenarios in which the logo can be used.Thanks~Chris--Just noticed that 'blog' in EEVblog is not capitalized. I should be able to fix that easily enough.
How much resistance does a Multimeter produce? - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: September 06, 2010, 06:31:07 am
content: I have done a test to measure resistance of two different circuits. One of them contains just the Multimeter and the other contains a Power Pack and an ammeter. I used them to measure resistance in the circuit. The circuit involving the Multimeter gave higher resistance, so my question is...How much resistance does a Multimeter have?

author: EEVblog
author_rank: Unknown
timestamp: September 06, 2010, 06:50:41 am
content: Quote from: Brittanym101 on September 06, 2010, 06:31:07 amA multimeter doesn't have "resistance" as such.It sounds like you are trying to measure the "resistance" of an active circuit across the voltage rails. Unless you have very specific reasons to measure such a thing, it is not a valid thing to measure, and you will get varying results as you have experienced.The reason is that a circuit will typically have a "resistance" that changes with the applied voltage, and your multimeter will apply a different test voltage than your power supply, so the result will vary.Hope that helps.Dave.

author: Unknown
author_rank: Unknown
timestamp: September 06, 2010, 09:32:09 am
content: Dave is obviously correct that you can't measure resistance with a multimeter in a circuit with voltage or current sources connected (assuming power pack contains some sort of battery).A DMM does have a resistance, but it depends on how you connect it and the range. When measuring current, the resistance is fairly low, but depends on the range. The higher the current range (eg. 10A vs. 400mA), the lower the resistance. It's usually somewhere between 0.1 ohm and 10 kohm. In most other modes, especially volts, the resistance is much higher, usually >1 Mohm, depending on range. You can measure both yourself if you have a second multimeter. It should also be in the manual, usually in the specifications section.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 06, 2010, 04:09:13 pm
content: OK we got another Hoax account ... do not reply .. check the signature of him ... and do not make him happy by clicking on it.

author: Zero999
author_rank: Super Contributor
timestamp: September 06, 2010, 05:06:57 pm
content: Why hasn't his signature been removed?

author: Simon
author_rank: Unknown
timestamp: September 06, 2010, 06:52:14 pm
content: I think it is just a case of banning him when Dave gets around to it, in the mean time we will ping rubber bands at him and laugh at him (or her or it)

author: NiHaoMike
author_rank: Super Contributor
timestamp: September 07, 2010, 01:15:03 am
content: Well, Dave has tried to "measure" the resistance of a 240V line with a multimeter several times...But yeah, a multimeter has a very high resistance when measuring voltage (most are 10M, some can go higher) and a low resistance when measuring current (depends on range setting for normal type, "zero" for a Hall effect meter).I wonder if that was the ghost of Brittany Murphy...
Telefunken brand is being revived - Page 1
Forum section: electronics / general

author: TheWelly888
author_rank: Frequent Contributor
timestamp: September 01, 2010, 02:44:25 pm
content: Some German businessmen are working to revive the Telefunken brand by developing a new range of high end consumer electronics. Check out the valved audio amplifier near the end of this clip! They look rather like NAD and Bang & Olufsen stuff though.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 01, 2010, 03:33:10 pm
content: They dream getting at the old track , but its just an marketing thing .High end = Made in GermanyAll the rest , high volume of products = Turkey & Asia ...Its just an marketing game , I do not believe them.
AVR External Crystal Waveform - Page 1
Forum section: electronics / general

author: cksa
author_rank: Regular Contributor
timestamp: September 01, 2010, 12:27:46 pm
content: What is a properly working external crystal on an avr suppose to look like? In terms of its waveform?On one of my XTAL pins, the voltage is at 0.8v and the other is a sinewave swinging from 0.8 to 2.8v. My power supply is at 2.8vJust wondering if that is ok, or is the crystal signal supposed to swing from rail to rail.Thanks.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 01, 2010, 12:41:12 pm
content: The AVR has some config fuses to set the xtal drive power - 'full swing' and a frequency-specific range. The latter has advantages in reducing power draw.A good rule is that a 'happy' oscillator has similar signal amplitudes on each pin, but you need to use a low-capacitance scope probe, e.g. x100 to avoid loading affecting the oscillator. A series 10M resistor on a normal x10 probe is an OK method if you don't have a x100 probe.
Today's Faraday - Page 1
Forum section: electronics / general

author: easilyconfused
author_rank: Regular Contributor
timestamp: August 28, 2010, 03:45:35 pm
content: Do you ever wonder how much import we put on historical personalities due purely to their stodgy appearances? Would history assign as much respect to them if they had looked more like today's people? Would Michael Farady have been invited to lecture if he looked like this?

author: dmlandrum
author_rank: Regular Contributor
timestamp: August 28, 2010, 05:12:41 pm
content: I want one of those Faraday t-shirts now.

author: MightyTwin
author_rank: Contributor
timestamp: August 28, 2010, 11:56:50 pm
content: Quote from: dmlandrum on August 28, 2010, 05:12:41 pmSeconded.

author: Time
author_rank: Frequent Contributor
timestamp: August 29, 2010, 03:28:41 am
content: Why Faraday? Maxwell was more important.

author: dmlandrum
author_rank: Regular Contributor
timestamp: August 29, 2010, 08:05:14 pm
content: Faraday's ideas on action-at-a-distance being caused by fields with specific field lines was what allowed Gauss and Maxwell to mathematically codify the behavior of electricity and magnetism. Now, there's no way of knowing if someone else wouldn't have had the same ideas as Faraday, but without Faraday, Maxwell and Gauss would've had to build on someone else's work, and that might have happened much later, or proven false, or any number of other outcomes.So, no, we needed Faraday.

author: Time
author_rank: Frequent Contributor
timestamp: August 29, 2010, 08:10:52 pm
content: No one said we didn't need him.

author: Rhythmtech
author_rank: Regular Contributor
timestamp: August 30, 2010, 08:40:47 pm
content: Put me down for a Faraday shirt.

author: retched
author_rank: Newbie
timestamp: August 30, 2010, 10:21:10 pm
content: Put me down for a 'Dave's head on Faraday's portrait' shirt.

author: rossmoffett
author_rank: Regular Contributor
timestamp: August 31, 2010, 02:17:35 am
content: I think an iPod or a smartphone might be more appropriate than a cigarette these days.

author: dmlandrum
author_rank: Regular Contributor
timestamp: August 31, 2010, 02:59:08 am
content: Yeah, the cigarette makes Michael look a bit like Andy Warhol.
Dual Slope Integrating ADCs - Page 1
Forum section: electronics / general

author: David
author_rank: Frequent Contributor
timestamp: September 03, 2010, 03:21:50 pm
content: Hi all,I have just come across dual scope integrating ADCs and I am having a little trouble trying to understand them...any simple explanations out there? Is the input signal captured before it is integrated? If so, what is the point of the integration?Dave

author: Zad
author_rank: Super Contributor
timestamp: September 03, 2010, 04:33:35 pm
content: I think the initial integration is there for two reasons, firstly it averages the signal. This of course helps remove any noise present. Secondly it allows a certain amount of scaling to maximise the use of the dynamic range available. The only time I have used it was on a CCD sensor, where it is exceptionally good because it integrates the entire charge on each CCD cell.

author: Unknown
author_rank: Unknown
timestamp: September 03, 2010, 04:35:13 pm
content: Thisseems a decent explanation.The basic idea is to use a capacitor of constant (at least for the duration of the cycle) but not necessarily known capacitance. You charge this with the unknown voltage through a resistor for a certain amount of time, then disconnect the input signal and connect it to a known reference voltage of known value of opposite polarity that discharges it through the same resistor, and measure the time it takes before it returns to zero. The net change in charge is zero (you start with an empty cap and end with an empty cap), so the charge during the two cycles is equal. You can calculate the unknown voltage from the time it took to discharge it.The advantage is that it's quite easy to detect 0V and measure time accurately, and component values like R and C are not critical. The integrating feature gives good noise rejection. The disadvantage is that's quite slow, since you have to discharge fairly slowly to get good accuracy. There are various smart ways to improve this, by using multiple ramps. The dual slopes are there to negate the effect of a change in capacitance value (it's hard to make capacitors really accurate or stable).

author: David
author_rank: Frequent Contributor
timestamp: September 03, 2010, 05:08:04 pm
content: Ahh I think it has just clicked!...by knowing the time constant and using the reference voltage you know the voltage at any particular time through the discharge so when it reaches zero you can simple calculate it.
I2C Tutorial - Page 1
Forum section: electronics / general

author: DavidDLC
author_rank: Frequent Contributor
timestamp: August 29, 2010, 06:46:46 pm
content: I would like to have a good tutorial on I2C ?I want to use a Real Time Clock and it uses this communication protocol.

author: migsantiago
author_rank: Frequent Contributor
timestamp: August 29, 2010, 08:32:59 pm
content: HiThe RTC you're planning to use must have a time graphic which details the operation of I2C. It's not that complicated to understand it.There also also some good DS1307 or 1302 C libraries which make transparent the use of the device.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 29, 2010, 11:19:37 pm
content: http://www.i2c-bus.org/
looking for work experience in the electronics industry - Page 1
Forum section: electronics / general

author: chandin
author_rank: Contributor
timestamp: August 27, 2010, 02:29:29 am
content: Hi everyone I'm new to the forum and I've been watching Dave's vids for a while.So I'm a third year electrical engineering student currently at Usyd and been looking for work experience(hopefully paid) in the electronics industry. Now I've been applying to all the standard places like Energy Australia, Integral, Transgrid etc and I do not know what my chances are of getting into their programs are. But I know that there should be a hidden job market and places where people don't normally apply to, though I'm not sure what it is and how to look for those opportunities.Can someone give me some tips on this?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: August 27, 2010, 02:51:16 am
content: I got my pre-career experience working for a temporary help agency (I presume they have those there as well). Over the course of a year I worked at 5 different companies. Through that I met a lot of sales reps for components and equipment and -THEY- always knew whose business was growing and who was going to need people.

author: EEVblog
author_rank: Unknown
timestamp: August 27, 2010, 03:04:53 am
content: Altium currently have several "intern" work experience students in and I believe are always looking for more.If you are interested in/have skills in FPGA/VHDL and/or embedded programming shoot me an email.Not really electronics design per se, more applications based stuff, but still a stepping stone.If you are interested in defense, give Thales a try.Dave.
Comparison or Test - Measure the resistance of your body...    - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 01, 2010, 06:45:24 pm
content: Are you sensitive to static electricity ?Do you feel that the telephone line voltage ( 40-60v ) cause an annoyance to your body ,when you hold both wires " electricity passes from your body ?Well you can measure your body resistance and find how sensitive you are ...Set your DMM at the 1M Ohm , and wait about some seconds to some minutes , until the reading to stabilize.For best results , seat on a chair , and place its hand over the knee of your legs. ( by holding the DMM leads as well ) , keep your knees at 20cm distance , and place your hands over the trouser ( Not naked skin.)My results , 650 - 700K Ohm ..Post yours too , but do not take an fast measurement ... and confirm it with two DMM if possible.Have fun , and report back.

author: Simon
author_rank: Unknown
timestamp: September 01, 2010, 06:49:41 pm
content: ah but your DC resistance will be different from you AC resistance, I can feel 24VAC (50 Hz) but not 24VDC

author: TopherTheME
author_rank: Regular Contributor
timestamp: September 01, 2010, 06:50:59 pm
content: FYI, biological resistance is a very dynamic thing and is highly dependent upon things like electrolytes (salts) and oils on the surface of your skin. Often you're not measuring the resistance of your body but the surface resistance of your skin. This is a similar effect to the resistance of an unclean PCB.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: September 01, 2010, 08:59:06 pm
content: When we work with electricity next to us, the most important part its our fingers.Testing the isolation that your fingers could naturally offer , it is an measurable proof,of how conductive you are .My hands this days are very soft, in comparison with the old days , that my fingers was hard because was half burned from the continues hand soldering.Generally I have the feeling , that I have good skin isolation at my fingers , if I was over sensitive , I would probably doing today , another job than electrician

author: PetrosA
author_rank: Frequent Contributor
timestamp: September 02, 2010, 12:32:54 am
content: This will vary a lot depending on (as TopherTheME mentioned) the minerals on your skin and the ambient humidity level. I will never forget the shocks I've gotten during the summer when I was coated with sweat - winter shocks don't even compare!
Take it apart! . . . dot net? - Page 1
Forum section: electronics / general

author: DJPhil
author_rank: Frequent Contributor
timestamp: August 21, 2010, 06:49:52 am
content: Found this site today, so I had to post it up here.Take It Apart dot net - Dissecting electronic gadgetry. Just for fun.I imagined a partnership with logos on each site like "This site approved by Dave Jones!", and "This site approved by takeitapart.net!".Also, putitbacktogether.net is available, but who'd want to do that?

author: EEVblog
author_rank: Unknown
timestamp: August 22, 2010, 03:02:56 am
content: Looks like they just repost other peoples videos. No original content?Dave.

author: saturation
author_rank: Super Contributor
timestamp: August 22, 2010, 11:10:59 am
content: Not sure I would go here for any reason. When I look for dissections all you need do is google 'tear down' or strip down etc., or such synonym and you can find diverse places were such dissections are done, plus the the original thread as to why they did it.The important thing is to do the tear down, and make sure google indexes your site so anyone can find it, not to collect it in one site, because finding them all will be impossible.

author: DJPhil
author_rank: Frequent Contributor
timestamp: August 22, 2010, 06:49:08 pm
content: I agree guys, it's not very useful, it's just the name that caught my eye.Truly, I never even thought to look for instructions on disassembly online. I've been doing it most of my life, and I'm sure most of us can say the same!
TI Launchpad - MSP-EXP430G2 - Page 1
Forum section: electronics / general

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: August 25, 2010, 04:16:14 pm
content: In case anyone was looking to order the TI Launchpad; I placed an order for 3 of them directly on the TI website yesterday, and this morning got an email saying they were backordered. They didn't give any clue at all about the leadtime.

author: Rhythmtech
author_rank: Regular Contributor
timestamp: August 25, 2010, 04:22:42 pm
content: I got mine yesterday, haven't had a chance to do anything other than install the software and connect it up and watch the led's blink though...Update of Relevant info: Ordered mine June 24

author: migsantiago
author_rank: Frequent Contributor
timestamp: August 25, 2010, 04:24:02 pm
content: I ordered mine on july 26th and haven't received anything.It seems that international orders have low priority.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 25, 2010, 04:45:56 pm
content: is the same ashttps://www.eevblog.com/forum/index.php?topic=736.0?

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: August 25, 2010, 04:57:06 pm
content: Yes.
Reliable online shop for electronic components - Page 1
Forum section: electronics / general

author: exodia
author_rank: Contributor
timestamp: August 21, 2010, 05:03:43 pm
content: Hi there i would like to know from which e-stores you buy electronic components. I live in Greece, if they have free shipping or really small shipping cost is a major bonusThanks all

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 21, 2010, 05:41:19 pm
content: Well , I had start getting common stuff like banana plugs and 9V clips or mini switches ,directly from ebay & China ..But even so , I buy some quantity like minimum 20 items from its type.I have found also many German shops at the German ebay , lots of stuff at low prices.There is no simple answer about the three or four known web stores, about pricing and shipping,all of them have deferent policy s , and all the shipments does pass from the Greek customs.If you go for free shipping , you will have to buy quantity , and the medium amount of money ,it will trigger the Greek customs.

author: Unknown
author_rank: Unknown
timestamp: August 21, 2010, 07:33:49 pm
content: Mouser and Digikey have free shipping over something like €65 for some European countries, not sure about Greece. Farnell and RS (not to be confused with Radioshack) may be active in Greece, and may even sell to individuals. Some Chinese shops like Seeedstudio (not that cheap for components) or Sure Electronics have reasonable shipping, but I wouldn't call them reliable, I wouldn't use them for anything were counterfeit parts would be an issue or you need accurate specs.In Germany, Reichelt is pretty large and cheap, but they really dislike foreign orders (minimum order quantity €150 last time I checked).

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: August 21, 2010, 09:44:04 pm
content: I've had good luck with these guys. Not the fastest shippers, but the orders have always been right and the parts good.http://futurlec.com/index.shtml

author: Time
author_rank: Frequent Contributor
timestamp: August 22, 2010, 04:25:01 am
content: Mouser and Digikey are the best for me. I order in the morning and its here 2 days later (United States).

author: GeoffS
author_rank: Unknown
timestamp: August 22, 2010, 06:42:58 am
content: Who in Australia have used Digikey or Mouser?What was delivery time, shipping cost, etc like?I've been using Futurlec but have a parts list that they are unable to fill, all parts are ex stock Digikey.

author: Simon
author_rank: Unknown
timestamp: August 22, 2010, 07:43:49 am
content: I use a combination of Farnell, then ebay if cheaper (I also sell my surplus on ebay) and sometimes RS if they have a better part or have something specific.
One of Dave's hero "The Waz" keynote speech at Gnomedex 2010 - Page 1
Forum section: electronics / general

author: Kiwi_frog
author_rank: Contributor
timestamp: August 21, 2010, 10:55:30 pm
content: Just this week The Woz spoke to a large crowd at Gnomedex 2010. Gnomedex is a tech conference run by Chris Pirillo of Tech TV(RIP) fame. I thought I'd share this because as Dave said in the last Amp hour, The industry needs its heroes.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 21, 2010, 11:45:08 pm
content: boring presentation for my taste..By the way, welcome in the forum.

author: Kiwi_frog
author_rank: Contributor
timestamp: August 22, 2010, 04:01:08 am
content: Thanks,Funny enough I thought the same, but i thought Dave might enjoy it.Mike.

author: EEVblog
author_rank: Unknown
timestamp: August 22, 2010, 04:34:49 am
content: Nice find, thanks!Dave.
Tom Scholz and other engineer/musicians - Page 1
Forum section: electronics / general

author: djsb
author_rank: Super Contributor
timestamp: August 19, 2010, 07:59:59 pm
content: I'm a rock music fan and was wondering if anyone new of any musicians who are also professional engineers. I love my music and like to get inspiration from those who have combined the two.One example is Tom Scholz who started the group Bostonhttp://en.wikipedia.org/wiki/Tom_ScholzJust a throwaway topic really, but thought I'd post it anyway.David.

author: Zad
author_rank: Super Contributor
timestamp: August 19, 2010, 10:37:16 pm
content: Fergal Sharkey (The Undertones lead singer and now head of UK Music) was an IC designer.Not electronics, but:(Dr) Brian May was studying an Astronomy PhD when he left to start Queen, and recently went back to complete it.A couple of Pink Floyd (Nick Mason and Richard Wright) are both architecture graduates.

author: NiHaoMike
author_rank: Super Contributor
timestamp: August 19, 2010, 11:14:38 pm
content: Don't forget the parents of spread spectrum technology, Hedy Lamarr and George Antheil.http://en.wikipedia.org/wiki/Hedy_Lamarr#Frequency-hopping_spread-spectrum_inventionhttp://en.wikipedia.org/wiki/George_Antheil#Other_interestshttp://britneyspears.ac/physics/intro/hedy.htmQuote

author: Rhythmtech
author_rank: Regular Contributor
timestamp: August 20, 2010, 06:03:53 pm
content: Girl Talk aka Gregg Gillisdoes biomedical engineering work, not sure if he is a biomedical engineer by degree, but I assume he is.SIDE NOTE: Robert Heinlein the sci fi author and his wife were both engineers
Neat scope hack - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 19, 2010, 03:28:05 pm
content: This has been around a while but I don't recall seeing it here -YouscopeDoubt it will work well on low-end digital scopes, but worth a try...File under "people with waaaaaaaaaay too much time on their hands"

author: jahonen
author_rank: Super Contributor
timestamp: August 19, 2010, 04:12:12 pm
content: I talked with author on IRC when this was created. It requires a non-oversampling sound card, which excludes most modern ones. Oversampling cards yields to bad results (unless you can take the sinc interpolation into account, and you can't do arbitary jumps from sample to sample as with zero order hold), as the trick is to use the scope as vector display.Regards,Janne

author: migsantiago
author_rank: Frequent Contributor
timestamp: August 19, 2010, 05:13:02 pm
content: Woow!!Which were the first and second places?

author: Simon
author_rank: Unknown
timestamp: August 19, 2010, 05:40:08 pm
content: that's incredible, somehow i get the impression it would not work well on a Rigol ?

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 19, 2010, 06:01:03 pm
content: enjoyable event ..But with zero usability , thats why I do not care to learn the details ..

author: Unknown
author_rank: Unknown
timestamp: August 19, 2010, 06:09:20 pm
content: Don't think this will work with cheap DSO's with their few screen refreshes a second either. Higher end scopes with variable persistence and high refresh rates might be able to give a reasonable approximation, but probably not as good as the old analog scope.

author: sigxcpu
author_rank: Regular Contributor
timestamp: August 19, 2010, 07:52:36 pm
content: tested this with every scope I've had in the past few years:- analog scope (HM 1005 from 1988, manufactured in West Germany) => very good- Welec DSO W2012A => pretty OK (this was shocking)- TDS220 DSO => pretty OK- DS1052E DSO => sucks (XY mode is a joke on Rigol)

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 19, 2010, 09:47:43 pm
content: Quote from: alm on August 19, 2010, 06:09:20 pmYes - Works surprisingly well on my Agilent MSO6034A but way better on a Tek 2465

author: Zad
author_rank: Super Contributor
timestamp: August 19, 2010, 10:53:02 pm
content: I used to do something similar (but much simpler) with a Commodore C64 driving an 8 bit DAC (that tells you kinda when it was that I did it). Another way of doing it was to use a PC analogue VGA output. You draw whatever you want in a drawing package, and overlay an image that starts white at the top of the screen, going to black at the bottom.
The Sounds of Sorting Algorithms - Page 1
Forum section: electronics / general

author: DJPhil
author_rank: Frequent Contributor
timestamp: August 19, 2010, 04:06:20 am
content: I found this kicking around the internet and thought you guys might dig it. Someone made a youtube video of different sorting algorithms in action using audio to demonstrate the sweeping through of the array.(Don't have your speakers cranked when you visit, you'll regret it)It explains a lot just seeing them work, very hypnotic.Edit: Added Heap Sort, same author.

author: Simon
author_rank: Unknown
timestamp: August 19, 2010, 06:53:09 am
content: interesting

author: David
author_rank: Frequent Contributor
timestamp: August 19, 2010, 09:49:55 am
content: I wrote a C program at Univeristy to compare several different sorting algorithms including bubble sort, Quicksort, Knuth binary tree and pigeon hole. I may upload the program if anyone is interested.

author: EEVblog
author_rank: Unknown
timestamp: August 19, 2010, 12:24:19 pm
content: Neat!Whohasn'tplayed with sort algorithms at some point?Dave.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: August 19, 2010, 12:54:58 pm
content: I bet you could do something interesting by deriving sounds from a PCB autorouter routing a complex PCB.Maybe some tearing noises when it rips up tracks, 'bumps' when it finds a dead end, shuffling when traces are pushed etc...

author: migsantiago
author_rank: Frequent Contributor
timestamp: August 19, 2010, 01:43:03 pm
content: Quote from: David on August 19, 2010, 09:49:55 amWhich one was the fastest?

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 19, 2010, 09:29:14 pm
content: i saw some different review indicating different type of sorting efficiency. But i always trust the Gonnet-Baeza Shell Sortbtw, that sound is interesting and funny! never thought of that.
Do Fluke rebadge their Fluke DTX 1800's? - Page 1
Forum section: electronics / general

author: Joy at MCS
author_rank: Regular Contributor
timestamp: August 16, 2010, 03:59:04 pm
content: I am curious. Does anyone know if Fluke re-badge their Fluke DTX 1800's. If so who makes them?

author: Rhythmtech
author_rank: Regular Contributor
timestamp: August 16, 2010, 06:22:05 pm
content: Sorry, I have no experience with the DTX 1800. You may want to try a forum for (computer) network engineers. I believe most of us are closer to board level design than implemented equipment so the instrumentation we use would reflect that. Scopes, multimeters, logic analyzers, and power supplies are the usual suspects.
The father of Electronics ... ( video )  - Page 1
Forum section: electronics / general

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: August 14, 2010, 08:02:52 am
content: I believe that this is the father of the modern electronics ...See the video , comment if you disagree ..

author: Simon
author_rank: Unknown
timestamp: August 14, 2010, 08:15:18 am
content: well they are certainly pushing the limits
PCBs marked out - Page 1
Forum section: electronics / general

author: Strube09
author_rank: Regular Contributor
timestamp: August 13, 2010, 01:53:31 pm
content: Hey everyone,Just got a quick question. Sometimes when I am getting some PCB's and I order say 70 PCB's and there are 20 per sheet the PCB maker will mark out the exra 10 pcbs on the last sheet with a sharpie (sometimes a whole sheet S/S on it). Why do they do that and what is "S/S". Spare sheet maybe?Wasted the PCBs that I could have used for spares.Thanks

author: Simon
author_rank: Unknown
timestamp: August 13, 2010, 03:45:30 pm
content: are you referring to layouts of your board that the program sends to the manufacturer or the actual sheet board you get back ?

author: slburris
author_rank: Frequent Contributor
timestamp: August 13, 2010, 03:49:35 pm
content: I think boards marked S/S stands for solder sample.And I think *that* means not electrically tested.Scott

author: Strube09
author_rank: Regular Contributor
timestamp: August 13, 2010, 05:01:41 pm
content: Quote from: Simon on August 13, 2010, 03:45:30 pmRefering the the actual sheet I get from them.