hybridfree/eevblog-posts huggingface dataset:
New low for Chinese sellers - bathroom stall electronic shops   - Page 1
Forum section: electronics / general

author: ez24
author_rank: Super Contributor
timestamp: August 14, 2015, 08:45:39 pm
content: http://www.aliexpress.com/item/B3008-precision-CNC-DC-DC-constant-voltage-constant-current-buck-LED-driver-modules-solar-charging-B3606/32364233497.htmlmy guess this seller is at least honest on his location - look at his store name --> "Mall bathroom"also this item is about 4 times the regular price - toilet time costs moneyI have been to Chinese electronic malls and this is easy to visualizeProbably gets the order (while sitting on a toilet) then finds a shop selling it, actually not a bad waymaybe ? This gives a new meaning to electronic shit.

author: Augustus
author_rank: Regular Contributor
timestamp: August 14, 2015, 09:26:54 pm
content: Careful with that sniffing Dave... You now know where this "cheap Chinese smell" originates from...https://youtu.be/0GdV7XBae74?t=1m16s
@free-electron about his PCB design book - Page 1
Forum section: electronics / general

author: ElektroQuark
author_rank: Unknown
timestamp: August 10, 2015, 08:34:47 pm
content: ETA?

author: timofonic
author_rank: Frequent Contributor
timestamp: August 10, 2015, 08:44:12 pm
content: Uhm. That's interesting to know.I did read about it, but it was from some time ago.Is the project still alive?I have tons of issues designing PCBs, this can be useful for me.Will there be an epub version?

author: c4757p
author_rank: Super Contributor
timestamp: August 10, 2015, 08:57:17 pm
content: Ah, I totally forgot about that! I'm looking forward to it as well.

author: IconicPCB
author_rank: Super Contributor
timestamp: August 10, 2015, 10:07:25 pm
content: Yes it will be interesting to see an expert in action.

author: Gixy
author_rank: Regular Contributor
timestamp: August 10, 2015, 10:15:15 pm
content: Was expected Q3 2014...I already have two books from Vincent: Visual Basic for EE and Mastering SMT. I now wait for two other nuggets from him: Jim Williams pulser and PCB book. Stars like to keep us waiting...

author: EEVblog
author_rank: Unknown
timestamp: August 10, 2015, 10:26:49 pm
content: My guess is he got really really busy when he started at Tesla. Well, actually, that's a fact when you work for Elon musk

author: timofonic
author_rank: Frequent Contributor
timestamp: August 10, 2015, 11:20:55 pm
content: Quote from: EEVblog on August 10, 2015, 10:26:49 pmOh, is Elon Musk finding geeks here to hire?

author: Galenbo
author_rank: Super Contributor
timestamp: August 11, 2015, 08:42:10 am
content: Quote from: Circuiteromalaguito on August 10, 2015, 11:20:55 pmNo, being Geek is a side effect that sometimes occurs to skilled engineers.As it sometimes appears to unskilled loosers too.Better not to identify like that when applying for a job.

author: timofonic
author_rank: Frequent Contributor
timestamp: August 11, 2015, 07:08:11 pm
content: Quote from: Galenbo on August 11, 2015, 08:42:10 amOf course, that's obvious. I don't know the hiring policy of Mr. Elon Musk, but I believed he mostly hired university freshmen.

author: free_electron
author_rank: Super Contributor
timestamp: August 11, 2015, 08:24:10 pm
content: Quote from: EEVblog on August 10, 2015, 10:26:49 pm<- this. Although it is still in progress. I'm about halfway done...

author: ElektroQuark
author_rank: Unknown
timestamp: August 11, 2015, 08:35:30 pm
content: Quote from: free_electron on August 11, 2015, 08:24:10 pmThank you for the update Vincent.

author: timofonic
author_rank: Frequent Contributor
timestamp: August 11, 2015, 08:59:28 pm
content: Quote from: EdoNork on August 11, 2015, 08:35:30 pmYes! Thanks a lot!Will there be an electronic version to purchase? These days I try to avoid deadtree books, too much space and I prefer to be more minimalist about physical stuff.

author: Christe4nM
author_rank: Unknown
timestamp: August 14, 2015, 06:26:10 pm
content: Thanks a lot for the update Vincent! Looking forward to be able to read and work through it. Best of luck with the design and the writing.
2015 Sydney Maker Faire EEVblog Meetup - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: August 14, 2015, 06:54:21 am
content: It's on tomorrow!http://makerfairesydney.com/I figure it's a good opportunity for forum members to meet as well. So from 11am to 12pm on both days, EEVblog/Forum people can meet in the activities section of the faire next to the Jaycar stand. I'll be there. I don't think I need to bring cardboard cutout Dave.https://makerfairesydney.files.wordpress.com/2015/08/mmfsyd15_program_and_map.pdf

author: Muttley Snickers
author_rank: Unknown
timestamp: August 14, 2015, 07:04:35 am
content: Will you be shooting a video for those of us that cannot attend.

author: EEVblog
author_rank: Unknown
timestamp: August 14, 2015, 07:09:42 am
content: Quote from: Muttley Snickers on August 14, 2015, 07:04:35 amOf the actual meetup? No, can't see what I'd want to.Of the faire, yes, I can't help myself.

author: TheElectricChicken
author_rank: Frequent Contributor
timestamp: August 14, 2015, 08:40:21 am
content: argh, short notice, takes more than one day to get to Sydney. argh !!!

author: TheElectricChicken
author_rank: Frequent Contributor
timestamp: August 14, 2015, 08:48:40 am
content: I'm going to miss out on so much, TELL ME they won't have, instead of a kids ball pit, a massive 15 meter dumpster filled with old electronic gear. TELL ME they won't have a "Make your own electric DeLorean" workshophttp://evalbum.com/4238. This not fair this not fair !!

author: TerraHertz
author_rank: Super Contributor
timestamp: August 14, 2015, 02:29:52 pm
content: Ahh crap, such short notice. Was this advertised here a few days ago, and I missed it?

author: TSL
author_rank: Regular Contributor
timestamp: August 16, 2015, 04:34:37 am
content: Quote from: TerraHertz on August 14, 2015, 02:29:52 pmDave announced it a few months ago here...https://www.eevblog.com/forum/chat/sydney-maker-faire-2015/msg691426/#msg691426

author: TSL
author_rank: Regular Contributor
timestamp: August 16, 2015, 04:54:55 am
content: I had a great day at the Faire!Got to meet Dave...Got a T shirtthanks Dave.Saw some cool and interesting stuff like a Pi-Cluster...http://www.bitscope.com/blog/EK/?p=FH10BLots of 3D printers and such and it was great to see the kids catered for too with many little robots to play with and control.R2D2 was wandering around the Faire to everyone's delight.One stand had some interesting Retro computer stuff like wafers to show people.All-in-all a great day, canardly wait to see Dave's video of the event.regardsTim
Apollo Luner Rover Opperations Manual - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 12, 2015, 02:35:23 pm
content: This is a great reading if you are interested.It even has schematics.38 MB PDF.https://www.hq.nasa.gov/alsj/LRV_OpsNAS8-25145.pdf

author: Deathwish
author_rank: Unknown
timestamp: August 12, 2015, 03:21:58 pm
content: yeah but can we build it better any suggestions or alterations you wish to discuss ?

author: German_EE
author_rank: Super Contributor
timestamp: August 12, 2015, 04:17:10 pm
content: By all accounts the 'mudguards' over the wheels were not all that well made and one broke off during one mission. The vehicle was still usable but the astronauts ended up getting covered in dust.So, replacement guards should be made of carbon fiber which is stronger and lighter.One thing has always bugged me about the lunar rover and that's the tiny little dish antenna, it doesn't look big enough and anyway how did they keep it aligned with either earth or the command module, both of which are moving relative to the moon.

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 12, 2015, 06:50:55 pm
content: The main reason I looked for this was to understand how the onboard navigation worked.I believe the antenna pointing was all manual alignment. There is an optical sight on the dish.All in all not bad for almost 50 years ago.

author: cimmo
author_rank: Frequent Contributor
timestamp: August 13, 2015, 05:49:00 am
content: Quote from: German_EE on August 12, 2015, 04:17:10 pmThe LRV had two antennas, a medium gain antenna that could support only voice and telemetry, and a high gain (dish) antenna for TV. The medium gain antenna only needed approximate pointing so it could be used while driving. The high gain antenna had to be manually pointed at earth during each stop.This link has nothing to do with the LRV, but is related to the communications (amateur monitoring of Apollo 11):http://legacy.jefferson.kctcs.edu/observatory/apollo11/

author: Howardlong
author_rank: Super Contributor
timestamp: August 13, 2015, 06:40:08 am
content: Quote from: cimmo on August 13, 2015, 05:49:00 amI've long thought that the various independent receptions of signals from the Apollo era using their directional antennas at the time ought to be reasonable proof enough for the Lunar landing deniers.
someone kick my backside - Page 1
Forum section: electronics / general

author: Deathwish
author_rank: Unknown
timestamp: August 12, 2015, 11:12:27 pm
content: I purchased some Anti static foam a while back to put in boxes for my IC's, I thought tonight I would put it in the larger drawers I got the other day. Good plan till I could not find it, an hour later I worked it out that I had thrown it in the bin by mistake
6000mah 18650 - Page 1
Forum section: electronics / general

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 12, 2015, 04:07:48 pm
content: I recently purchased some 18650 batteries that were claimed to be rated at 6000mAH from ebay.I never thought they would be even half of the stated 6000mAH but I tested them anyway.I used a constant current set at 500mA and used a dataloger to graph the results.The results were 1004 mAH. WHAT A RIP!http://www.ebay.com/itm/4x-3-7V-6000MAH-18650-Protected-Li-ion-Rechargeable-Battery-For-Flashlight-Torch-/281501178903?pt=LH_DefaultDomain_0&hash=item418ac71c17http://www.ebay.com/itm/10PCS-3-7V-6000mAh-18650-Li-ion-Rechargeable-Battery-for-UltraFire-Flashlight-HG-/291441198224?hash=item43db3fc490http://www.ebay.com/itm/2PCS-3-7V-6000mAh-18650-Li-ion-Rechargeable-Battery-for-UltraFire-Flashlight-HG-/281670777047?hash=item4194e2f8d7

author: wraper
author_rank: Unknown
timestamp: August 12, 2015, 04:30:51 pm
content: But what did you expect from buying fakes. To be half if the capacity, it would need to be pretty good battery inside, Why should they need to be half of the rated capacity if they are lying anyway. IIRC max capacity what you can get in 18650 package is 3600 mAh Panasonic NCR18650G.

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 12, 2015, 04:58:24 pm
content: I knew it was a fake, it seems you missed the point, which is don't buy these (claimed) 6000mAH batteries.

author: ovnr
author_rank: Frequent Contributor
timestamp: August 12, 2015, 05:00:39 pm
content: And wraper's point was "don't make any assumptions about obviously fake products when you buy them".

author: wraper
author_rank: Unknown
timestamp: August 12, 2015, 05:21:05 pm
content: Quote from: ovnr on August 12, 2015, 05:00:39 pmyep

author: wraper
author_rank: Unknown
timestamp: August 12, 2015, 05:35:17 pm
content: To think it being 3000 mAh, is exactly the same as expecting quality/capacity of very good genuine battery from the cheap obvious fake.

author: gregfox151@gmail.com
author_rank: Contributor
timestamp: August 12, 2015, 05:59:20 pm
content: I never said half of 6000mAH, what I did say was "I never thought they would beevenhalf of the stated 6000mAH "Now don't all you cowboys (and girls) miss the point even more. I bought them to test, not to use them. I knew they were junk before the came into my lab, I an simply warning others that they are really JUNK!

author: wraper
author_rank: Unknown
timestamp: August 12, 2015, 08:25:21 pm
content: Quote from: gregfox151@gmail.com on August 12, 2015, 05:59:20 pmAh, have read that wrong. However you could spare your money, there wasn't any real need for a test. Just a googling a bit wold reveal that they are complete junk.http://www.candlepowerforums.com/vb/showthread.php?388599-Test-Review-of-UltraFire-SJ18650-6000mAh-(Black)http://www.ebay.com/gds/18650-Battery-Buying-Guide-test-on-all-from-eBay-below-3-/10000000178020340/g.htmlBlacks 6000 mAh actually are among the bestof the worst.
Gravity Battery Test - Page 1
Forum section: electronics / general

author: Richard Crowley
author_rank: Super Contributor
timestamp: August 12, 2015, 02:09:58 pm
content: https://youtu.be/Y_m6p99l6ME

author: continuo
author_rank: Frequent Contributor
timestamp: August 12, 2015, 03:00:09 pm
content: Now, repeat that test with a mounted batteriser and check how it bounces

author: Aodhan145
author_rank: Frequent Contributor
timestamp: August 12, 2015, 03:07:57 pm
content: Measuring the voltage without a load.

author: continuo
author_rank: Frequent Contributor
timestamp: August 12, 2015, 03:09:08 pm
content: Btw: Dave also did this in one of his vids:

author: zapta
author_rank: Super Contributor
timestamp: August 12, 2015, 04:16:37 pm
content: Quote from: Aodhan145 on August 12, 2015, 03:07:57 pm... and using different battery brands.

author: Richard Crowley
author_rank: Super Contributor
timestamp: August 12, 2015, 04:23:23 pm
content: Quote from: continuo on August 12, 2015, 03:09:08 pmThanks. I missed that one.My first thought was that drawing power out of the alkaline cell changes the physical nature of the internal contents ("dries up"?) which makes the depleted cell lighter and "bouncier".In addition to Dave's more scientific proposed test methodology, it would be interesting to see if batteries of other chemistries have any similar behavior. One might expect that a rechargable cell wouldn't behave the same way as a primary cell.

author: RickBrant
author_rank: Unknown
timestamp: August 12, 2015, 04:59:52 pm
content: Quote from: Richard Crowley on August 12, 2015, 04:23:23 pmIt can't possibly make it lighter unless there's a vent, which there isn't. Conservation of mass and all that.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: August 12, 2015, 05:12:34 pm
content: Quote from: RickBrant on August 12, 2015, 04:59:52 pmThe lost charge would lead to a (very, very, very, very, very) small drop in the mass. So I can see 2 options to what's happening. 1) when the battery is drained it's mechanical characteristics change making the cell more elastic or 2) Dave is in on a massive bit of trolling.

author: kolonelkadat
author_rank: Regular Contributor
timestamp: August 12, 2015, 05:47:31 pm
content: Quote from: Richard Crowley on August 12, 2015, 04:23:23 pmyes. fresh batteries are more fluid inside so kinetic energy isnt transferred as quickly as is required to bounce. dead batteries are solid inside thus the bounce.its the same principle that makes dead blow hammers work.
About PCB break-away tab - Page 1
Forum section: electronics / general

author: tina666
author_rank: Newbie
timestamp: August 12, 2015, 07:51:35 am
content: Who knows if the break tab of PCB add the copper?

author: tszaboo
author_rank: Super Contributor
timestamp: August 12, 2015, 08:57:56 am
content: Use a better translator please.

author: lutkeveld
author_rank: Regular Contributor
timestamp: August 12, 2015, 11:05:31 am
content: You can have copper there, if that's your question. For testing for example.
OT Check out this motorcycle crash. - Page 1
Forum section: electronics / general

author: nctnico
author_rank: Super Contributor
timestamp: August 10, 2015, 11:22:57 pm
content: I never got into driving a motorcycle. Probably the reason I'm still here...

author: SL4P
author_rank: Super Contributor
timestamp: August 11, 2015, 07:41:15 am
content: Now the bikes been trashed - he's taking up surfing.

author: AndyC_772
author_rank: Super Contributor
timestamp: August 11, 2015, 09:04:01 am
content: Quote from: nctnico on August 10, 2015, 11:22:57 pmIt's a really good antidote to time spent in the lab, though. The experience of riding a motorcycle is about as far as it gets from sitting at a desk, staring at a screen and poking at tiny components with a scope. Your eyes are focused on things in the distance, not right in front of you. You've got the noise, the wind, and a whole gamut of physical sensations that you just don't get from soldering or writing code. And it's a social thing; bikers are among the friendliest people you could ever hope to meet... at least, provided you're one of them. And often, even if you're not.It was my wife who got me into it. She'd been riding on and off for years, and one morning I went into the garage and saw her little Suzuki, sitting in its usual spot, slowly dripping oil onto the garage floor, and I said to myself "if you're not going to ride that thing, then I will".Best decision I ever made, IMHO.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: August 11, 2015, 03:25:10 pm
content: That idiot is very very lucky indeed. No leathers, could you imagine what would have happened if he'd hit the tarmac?

author: continuo
author_rank: Frequent Contributor
timestamp: August 11, 2015, 03:47:10 pm
content: Well, is this a real crash or some sort of made up professional stunt for a viral ad or something? This dude has some serious difference speed to the car, how on earth could he suddenly just lose all his momentum and stay on the slippery roof of the car?

author: IanJ
author_rank: Unknown
timestamp: August 11, 2015, 04:15:27 pm
content: On Facebook around here they call him the Russian Ninja Biker.Ian.

author: lewis
author_rank: Frequent Contributor
timestamp: August 11, 2015, 04:18:48 pm
content: Lucky bastard!

author: Deathwish
author_rank: Unknown
timestamp: August 11, 2015, 04:27:43 pm
content: Last time I went to hospital because some daft female in a renault turned right when indicating left and I went to overtake her I got called a parts donor by the nurse.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: August 11, 2015, 04:44:40 pm
content: Quote from: Deathwish on August 11, 2015, 04:27:43 pmAt least you're not a horse rider. 60 times more likely than a bike rider to die on the roads, also much more likely to kill someone else.
Optus launches Voice Over IP application to solve reception issues - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: August 11, 2015, 09:46:11 am
content: Original article here:http://www.news.com.au/technology/gadgets/optus-launches-wi-fi-calling-app-wi-fi-talk/story-fn6vihic-1227479166662It's an interesting concept and I guess one which makes sense. When at home, I automatically connect to my internal network for data, why can't my voice calls be routed down the same path? Optus isn't exactly renowned for it's network coverage, so this would probably prove very useful for many Optus customers. However I don't see it as a bad thing if someone like Telstra followed suit.Calls have the potential of being far more secure and help spread the load over other mediums. It would also mean those users who make a significant portion of their outgoing calls from home, could save money by choosing a cheaper plan. Handover from Wi-Fi over to cellular might be a bit of an issue initially, but not one that can't be solved.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: August 11, 2015, 11:29:33 am
content: Why use one from what you say is an abysmal telco and carry on paying them for calls you can make for free through a myriad of other apps? Shouldn't they just upgrade their network instead of expecting their customers to pay out for another connection so they don't have to so you can carry on paying them for making calls?
Magnetism in non-magnetic materials - Page 1
Forum section: electronics / general

author: FrankenPC
author_rank: Unknown
timestamp: August 11, 2015, 05:45:41 am
content: Really interesting article on synthetic magnets and magnetism in general. Very simplified article.http://www.gizmag.com/turning-non-magnetic-metals-magnetic/38805/"By subtly altering certain quantum interactions in matter, scientists from the University of Leeds have shown for the very first time how to generate magnetism in metals that aren’t normally magnetic. Synthetic magnets made using this technique may one day reduce our reliance on rare or toxic metals in such things as wind turbines, computer hard drives and magnetic field medical imaging devices.""...However, in ferromagnetic materials, where there are more "un-paired" electrons than paired ones (that is, where the Stoner criterion is greater than one), then the magnetic fields ordinarily canceled out by oppositely-oriented electrons are allowed to exist. As such, each un-paired electron can be said to act like a tiny magnet and, with many such electrons in a material, they provide an overall magnetic field to the metal in which they reside."

author: G7PSK
author_rank: Super Contributor
timestamp: August 11, 2015, 08:33:45 am
content: So if I read the article correctly which I think I did. They took something like a 316 stainless steel which is not magnetic melted it, added extra carbon in the form of bucky balls which no doubt degraded at the temperature of molten steel and by doing so made non stainless steel which is magnetic further a type of steel which will be prone to stress corrosion due to all the carbon chrome interfaces.Any one else looking for a grant renewal.
High powered Veractor Diode or similar - Page 1
Forum section: electronics / general

author: Coe Schlicher
author_rank: Newbie
timestamp: August 06, 2015, 04:38:58 pm
content: Is there such a thing that works like a Veractor Diode but can handle higher power? Hoping to get something that gets up to 800W but would take anything that gets me out of the 5W range. Does such a thing exist? Linearity is important for the application.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 06, 2015, 05:15:41 pm
content: At 50 ohms, that's 566 Vpp. To get any kind of linearity, the curve needs to be shallow over that range. Which is at odds with being able to adjust it at all, too. You'd have to do some serious calculus against a standard tuning circuit to see how much curvature is tolerable for a given amount of nonlinearity, but it's just say it needs to be no worse than 2:1 (p-p). To get a 4:1 average capacitance range needs about a 1700V rating. Certainly, it can't be silicon; SiC, GaAs or other compound semiconductors might do the job, but I don't know that such things are in production.You can try an SiC schottky, I guess? Don't be surprised if it stinks, though.Obviously, the voltage goes down with parts in series (and linearity improves for parts in anti-series), but you still have to contend with fairly high voltage parts, and high current ratings, that may not be available commercially. Not to mention blowing your available ESL in the string, making tuning harder again.The only kind of high power active tuners I've seen are servo driven vacuum capacitors. $10k's easily. You're probably better off solving your problem by reimagining the problem itself; e.g., try frequency tracking instead? (If it's in an ISM band, that kind of wouldn't work, so you'd need tons of EMI shielding. But hey, it's still cheaper than the alternative.)Tim

author: AF6LJ
author_rank: Unknown
timestamp: August 06, 2015, 06:11:47 pm
content: Quote from: Coe Schlicher on August 06, 2015, 04:38:58 pmI have seen veractors that would produce 40W but nothing like what you are looking for.

author: KJDS
author_rank: Super Contributor
timestamp: August 06, 2015, 06:55:06 pm
content: As has already been shown, you need at least 1000V. I had a look at the Macom sight as they do diodes as well as anyone does. The highest breakdown tuning varactor is 30V.

author: Coe Schlicher
author_rank: Newbie
timestamp: August 10, 2015, 09:17:11 am
content: Thank you for the responses. This confirms what I was finding. On to plan B I suppose.
Which carrier is the cheapest at Melbourne & Sydney ? - Page 1
Forum section: electronics / general

author: BravoV
author_rank: Super Contributor
timestamp: August 10, 2015, 03:56:44 am
content: Going to visit Oz soon, maybe just for about two weeks or less, and only around Melbourne & Sydney.Which carrier is the cheapest especially for it's data plan ? Of course good coverage around this two places.

author: EEVblog
author_rank: Unknown
timestamp: August 10, 2015, 08:13:53 am
content: Telstra generally has the best coverage, but AFAIK they don't let other use their network?Optus is generally next best, and then Vodaphone brigns up the rear.The small cheap companies will use the Vodaphone or Optus networks.

author: EEVblog
author_rank: Unknown
timestamp: August 10, 2015, 08:14:58 am
content: Found a list:http://www.mobilenetworkguide.com.au/virtual_operators_information.html

author: BravoV
author_rank: Super Contributor
timestamp: August 10, 2015, 08:23:53 am
content: Thank you Dave !

author: Halcyon
author_rank: Unknown
timestamp: August 10, 2015, 08:28:19 am
content: You might want to consider a pre-paid (or pay-as-you-go) SIM from a reseller instead of directly from the 3 carriers. For example Aldi Mobile (https://www.aldimobile.com.au) are a reseller for Telstra's 3G product. Whilst you won't benefit from Telstra's 4G network, their prices are quite reasonable.You can order their SIM online (not sure if they'll send overseas) or you can buy them from Aldi supermarkets.Others you can check out:www.boost.com.au(Telstra)www.amaysim.com.au(Optus)www.lebara.com.au(Vodafone)www.virginmobile.com.au(Optus)Prepaid SIM cards can be purchased at all major supermarkets and newsagencies in Australia. They'll most certainly have them at the airport as well.As for quality of product, Telstra have the widest coverage and fastest network in Australia by far. It's pretty much a toss-up between Vodafone and Optus in major cities. Optus have come a long way recently but their coverage can still be patchy (especially in Canberra).Just make sure whatever handset you decide to bring over to Australia supports our frequency bands:Telstra 3G: 850MHz, 2100MHzOptus 3G: 900MHz, 2100MHzVodafone 3G: 850MHz, 900MHzTelstra 4G: 700MHz, 900MHz, 1800MHz, 2100MHz, 2600MHzOptus 4G: 1800Mhz, 2600MHzVodafone 4G: 850MHzMore details here:http://whirlpool.net.au/wiki/mobile_phone_frequenciesEnjoy your trip!
Buck Rogers in the 25 Century. Dr. Theopolis. - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 08, 2015, 11:58:02 pm
content: I was about 13 or 14 when this show was on TV. I thought it was one of the coolest things to watch. The props and the special effects were way cool at that time.This was one of the shows that got me going in electronics. This and the original Battlestar Galactica The trips with mom to Radio Shack to buy LED's, diodes and resistors. The project kits 100 in one ect.Anyone remember Dr. Theopolis? I thought that thing looked so cool.I finally found a website yesterday that has pictures of the original prop. Amazing to see what it actually looks like compared to the way I remember it as a kid.Check out the 4 series cmos and the date codes on the ic's. Not to mention that they are just glued on.Original clip from the series.Actual pics of prop from this website:http://www.byyourcommand.net/cylongallery/displayimage.php?album=358&pid=11440#top_display_media

author: pickle9000
author_rank: Super Contributor
timestamp: August 09, 2015, 12:26:58 am
content: Amazing what you can get away with on TV. The effect is excellent.

author: netdudeuk
author_rank: Frequent Contributor
timestamp: August 09, 2015, 06:02:28 pm
content: I remember him well. He didn't half do a lot given he only had those chips. Maybe Woz designed him ?

author: pickle9000
author_rank: Super Contributor
timestamp: August 09, 2015, 06:06:56 pm
content: Quote from: netdudeuk on August 09, 2015, 06:02:28 pmSingle channel color organ, chips only function was visual, not connected. Classic numbers though.

author: Richard Head
author_rank: Frequent Contributor
timestamp: August 09, 2015, 06:15:47 pm
content: All I remember about Buck Rogers was the gorgeous babe in skintights. Erin Gray was her name. I'm getting heart palpitations just thinking about her.

author: grantbob
author_rank: Unknown
timestamp: August 09, 2015, 07:50:22 pm
content: I had a canteen from Sears that looked like this one:http://www.ebay.com/itm/2-Quart-Desert-Wool-Blanket-Canteen-Boy-Scout-Camping-Hiking-FREE-SHIPPING-/310404866343Used to pretend that was Dr. Theopolis...

author: netdudeuk
author_rank: Frequent Contributor
timestamp: August 10, 2015, 05:51:38 pm
content: Quote from: pickle9000 on August 09, 2015, 06:06:56 pmIt was a tongue in cheek comment relating to the fact that he was this smart being in the story, not that they could get a few lights blinking on the prop.
Fast Pulse Generator Kit? - Page 1
Forum section: electronics / general

author: prenato
author_rank: Regular Contributor
timestamp: September 17, 2012, 08:52:58 pm
content: I'm interested in buying (or building) a fast (sub 1 ns) pulse generator. It can be an avalanche mode such as the "Jim William" pulse generator covered in one of Dave's videos or some other implementation. Is there a kit available for purchase or even an assembled generator for a reasonable price somewhere (say, less than $50)? I really liked the Munaut.S build but, since at these speeds the layout is so critical, I would rather buy a kit or at least a PCB where the layout issues were already worked-out.Thanks in advance,Paulo

author: prenato
author_rank: Regular Contributor
timestamp: September 18, 2012, 06:19:21 pm
content: Surprised nobody knows of a kit or commercial product like this. Hmmm... maybe there's an oportunity here for someone willing to sell a kit!...

author: amyk
author_rank: Super Contributor
timestamp: September 19, 2012, 07:17:12 am
content: There's a picture of one in Appendix Dof this application note. "Layout" isn't really layout, all the components are just soldered together in one blob-like mass to keep all the leads as short as possible.

author: prenato
author_rank: Regular Contributor
timestamp: September 19, 2012, 04:57:15 pm
content: Thanks amyk. I might give that a try if I can't find a kit or pcb. Reading through the original thread on this forum, I found that free_electron had implemented what seems like an excellent layout and board design:https://www.eevblog.com/forum/blog-specific/eevblog-306-jim-williams-pulse-generator/45/I wonder if he is still planning to sell this? I would definitely be interested.Thanks,

author: Bored@Work
author_rank: Super Contributor
timestamp: September 19, 2012, 05:06:29 pm
content: I think someone here produce a PCB and did even send a complete generator to Dave. It was shown in one of the (mailbag?) videos.

author: prenato
author_rank: Regular Contributor
timestamp: September 19, 2012, 06:24:13 pm
content: Quote from: Bored@Work on September 19, 2012, 05:06:29 pmYes, that's the Munaut.S build I referenced in the post. Free_electron also has a nice build in his post. I was looking to buy a pcb or kit rather than build one from scratch (Munaut.S actually generously posted his source files for someone that wants to go that route).Paulo

author: free_electron
author_rank: Super Contributor
timestamp: September 19, 2012, 07:20:07 pm
content: i'm back from vacation. will prepare the kits over the weekend and throw them on ebay.

author: prenato
author_rank: Regular Contributor
timestamp: September 19, 2012, 08:17:45 pm
content: Great! Please keep us posted

author: heliosh
author_rank: Newbie
timestamp: August 11, 2015, 05:53:50 pm
content: Hi,Is this kit still available somewhere?
Light show - Page 1
Forum section: electronics / general

author: technix
author_rank: Super Contributor
timestamp: August 07, 2015, 03:02:25 pm
content: Just a pic. Try to ID everything involved in this pic.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: August 07, 2015, 05:15:36 pm
content: USB hub and a few USB UART adapters?

author: technix
author_rank: Super Contributor
timestamp: August 07, 2015, 07:01:28 pm
content: Quote from: Mechanical Menace on August 07, 2015, 05:15:36 pmYup an Orico 7-port USB 3.0 hub and a few M180v3 USB UART adapters.
Interesting viewing about space junk - Page 1
Forum section: electronics / general

author: Deathwish
author_rank: Unknown
timestamp: August 05, 2015, 09:09:07 pm
content: http://www.bbc.co.uk/iplayer/episode/b0656dbj/horizon-20142015-13-the-trouble-with-space-junk

author: unitedatoms
author_rank: Frequent Contributor
timestamp: August 06, 2015, 02:54:24 am
content: Can not view it in USA

author: albert22
author_rank: Regular Contributor
timestamp: August 06, 2015, 02:29:31 pm
content: Quote

author: Deathwish
author_rank: Unknown
timestamp: August 06, 2015, 03:19:27 pm
content: go get it herehttp://www.filedropper.com/sat_1
About AC/DC SMPS power supply - Page 1
Forum section: electronics / general

author: sreenathan
author_rank: Newbie
timestamp: August 09, 2015, 08:29:28 am
content: Dear Members.I brought about 10 nos of 24V ac dc power supplies in my local market but all are made in china. all the power supplies have failed ( Mosfet shorted). The SMPS used is a flyback topology and the 8pin DIP IC is plain ( no part number or any code). The pins does not match with regular 3842/3/4/5 or any other PWM controllers. The IC uses 8th pin as output and 7th pin as input supply from the auxillary winding. There is a high value resistor connected from pin 3 to the high voltage line, i think ic uses this power to initially switching ON.Please help me if your know the IC part number or equivalent IC.ThanksSreenathan

author: sreenathan
author_rank: Newbie
timestamp: August 09, 2015, 08:32:29 am
content: Quote from: sreenathan on August 09, 2015, 08:29:28 amThere is print found on the PCB as KH-350 and KEHAO
WireLess keys  Cars & Doors  KeeLoq  FAIL - Page 1
Forum section: electronics / general

author: C
author_rank: Super Contributor
timestamp: August 06, 2015, 06:06:34 pm
content: Just saw this on arstechnicaWidely used keyless entry systems can be hacked in seconds with wallet-sized device.$30http://arstechnica.com/security/2015/08/meet-rolljam-the-30-device-that-jimmies-car-and-garage-doors/C

author: PA0PBZ
author_rank: Super Contributor
timestamp: August 06, 2015, 07:04:44 pm
content: QuoteRight, but:- How does the device receive the first code while jamming the frequency so that the car does not receive it?- How does the device prevent the car from receiving the second code?

author: C
author_rank: Super Contributor
timestamp: August 06, 2015, 07:41:14 pm
content: The electronic key transmits at max powerDistance is the opening here.The receiver is expecting a digital signal.The jamming could be as simple as broadband noise. This would raise the noise floor of the intended receiver, the electronic key would need to be closer to still function.With the device creating the noise there exists the possibility of subtracting the noise out of what it receives. And the receiver could be better.C
CRT Class Action Lawsuit - US residents  - Page 1
Forum section: electronics / general

author: kwass
author_rank: Frequent Contributor
timestamp: August 03, 2015, 02:08:18 am
content: I came across this rather interesting lawsuit concerning price fixing of CRT's sold from 1995 to 2007.https://www.crtclaims.com/While this only applies to residents of some US states, I suppose that other states may eventually be included, possibly other countries as well. Given that it wasn't until 2003 that LCD-based monitors/televisions outsold CRT-based monitors/televisions this is a gigantic law suit.Has anyone here already filed a claim? While I bought several monitors and TV's in that time frame (but no oscilloscopes) and live in NY state, I was a bit put off by the on-line form that asks for part of my social security number and date of birth.

author: saturation
author_rank: Super Contributor
timestamp: August 04, 2015, 02:49:52 pm
content: That's very interesting and that it spans so long ago. Having receipts for those items would be difficult to obtain, as the periods involved are beyond normal record keeping practice.
Interesting plant-based photovoltaics - Page 1
Forum section: electronics / general

author: hurricanehenry
author_rank: Regular Contributor
timestamp: August 04, 2015, 01:13:07 am
content: Came across thishttps://youtu.be/Ku1-_MOzkTEI was surprised there is a voltage gradient between the plants and the roots.I guess in retrospect it should be obvious, as the leaves above-ground are on the opposite side of the equation from what is biochemically going on on with the roots.The trick I think was how they insulated the upper and lower parts so that there is no short circuit, and you then tap into the voltage potential.I wonder what is the voltage and current per "cell" in that arrangement? No doubt they would have to organize the various plant "cells" accordingly to make sufficient batteries of usable voltage and amperage.
WTF Farnell - About the recent changes in Farnell Russia/Ukraine - Page 1
Forum section: electronics / general

author: SolarSunrise
author_rank: Regular Contributor
timestamp: August 03, 2015, 06:32:32 pm
content: After spending several weeks of designing my hobby project (part selection, schematics, pcb layout, etc.), I was finally ready to build the damn thing. So few weeks ago I placed an order in Farnell, about 150 euros in total, and I get this jolly message:QuoteWhich a quick google translate told me that due to changes in "export policy," my minimum order had to be 300 euros.Yeah sure...300 euros...It turns out people in Russia and Ukraine are also complaining about this new "export policy." Even if I ordered 300 euros worth of parts, my order would have been stuck in customs for at least a month. And don't get me started on Digikey or mouser; their shipping charge is 120 bucks regardless of how much you order, and I am not even talking about customs.I am pretty sure that these changes are the result of current "global political situation". Right now I am just sad... Bye free shipping from mouser/digikey. Bye farnell. And those of you who can receive parts in 3 - 5 days with FREE SHIPPING, I envy you.

author: Artlav
author_rank: Frequent Contributor
timestamp: August 03, 2015, 07:11:22 pm
content: Quote from: SolarSunrise on August 03, 2015, 06:32:32 pmHm?Maybe it's a bit different for Russia, since i always got my orders from Digikey without much trouble, and the delivery is in the $50-$60 range.Last time was early July, for $350. Before then in late February, for $180 - no issues or "export policy".No custom fees or delays as well.I once had a problem with Digikey trying to bullshit something about $120 delivery "to company address only" due to "export restrictions", but repeated hammering of the support with facts resulted in the ticket being read by a conscious entity and the order being sent normally with an apology.For Farnell, i had to post a signed form to the effect of "i'm not going to sell that to the terrorists" in order to get a BeagleBone board, but that was back in 2009.

author: SolarSunrise
author_rank: Regular Contributor
timestamp: August 03, 2015, 07:18:49 pm
content: Quote from: Artlav on August 03, 2015, 07:11:22 pmReally? 50$ - 60$ shipping to here? Looks like I haven't read their shipping policies correctly. I think I've been too spoiled by free shipping (when I was in France, ah the good old days of 20% VAT) but that sound pretty reasonable. Nevertheless, I am quite uncertain about the customs in Ukraine though... Anyways thanks for the info!

author: Howardlong
author_rank: Super Contributor
timestamp: August 03, 2015, 09:25:59 pm
content: Shipping to Russia and Ukraine is a nightmare at the moment, with some carriers are refusing to ship to residential addresses (Fedex needs a commercial address at the moment for example for me to ship from the UK).
Test lead holder - Page 1
Forum section: electronics / general

author: Weaver
author_rank: Contributor
timestamp: August 03, 2015, 02:56:22 am
content: Hi guys, Been a long time reader/watcher of Dave's videos and here on the forum... I've had an idea and thought I'd post it here, I've found that those cheap test lead holders you find on the net can get really expensive if you need lots of them, so I've went out to an old surplus store around my area and found some old wire raceway molding, and It's pretty cheap... You can see in the pictures what I've done, I have just cut the raceway in half and you can cut whatever length you want and I've got 4 test lead holders out of one 4 foot section, which I paid $3.00 for... So I just thought I'd post it here, some may like it some may not..
An Electromagnetic and Ultrasonic Shield - Page 1
Forum section: electronics / general

author: 4beowulf7
author_rank: Newbie
timestamp: July 31, 2015, 06:58:43 am
content: Greetings,I like to present a Shielding Carpet for shielding Electromagnetic (EM) and Ultrasonic waves.Shielding EM waves is easy. You need to enclose whatever you want to shield by some metal. Faraday cage is a good example.But how are you going to stop Ultrasonics? Here is how.https://tr.scribd.com/doc/273042223/EM-and-UltraSonic-ShieldGreetings

author: daqq
author_rank: Super Contributor
timestamp: July 31, 2015, 07:29:01 am
content: Wouldn't using antistatic foam (the conductive type, or antistatic bubble wrap) be better for your bubble wrap region? Anyway what's it for?I couldn't help but look at some of your other papers...http://www.scribd.com/doc/273024727/Stargate...seriously? Do you actually build (or believe) these things?

author: DmitryL
author_rank: Regular Contributor
timestamp: July 31, 2015, 09:02:55 am
content: Quote from: 4beowulf7 on July 31, 2015, 06:58:43 amYou are too late with your invention, I'm afraid .I recently bought a roll of thermal insulation matherial, made of metallized bubble-wrap film, so, it is available in every DIY store.... one roll is enough to make about a dozen tin-foil-hats, shielding from ultrasound as well!

author: Mr.B
author_rank: Unknown
timestamp: July 31, 2015, 09:23:24 am
content: Quote from: daqq on July 31, 2015, 07:29:01 amAnother "rance varment" by any chance?

author: miguelvp
author_rank: Super Contributor
timestamp: July 31, 2015, 05:50:53 pm
content: It might come handy when you walk to a Starbucks that has UBeam ultrasound chargers blasting waves to all the customers inside:)
An Ancient Motor - Page 1
Forum section: electronics / general

author: 4beowulf7
author_rank: Newbie
timestamp: July 31, 2015, 08:27:06 am
content: Hi guys!I found something interesting and like to share it with you. It's about permanent magnet motors?https://tr.scribd.com/doc/273123513/Ancient-MotorGreetings

author: Mechanical Menace
author_rank: Super Contributor
timestamp: July 31, 2015, 02:10:05 pm
content: Quote from: 4beowulf7 on July 31, 2015, 08:27:06 amIt's aboutpareidolia, if it was about motors it'd mention it in the hieroglyphs and their use would have been mentioned in other sources too, definitely else where in Egypt and almost certainly by the Greeks as well.

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 31, 2015, 11:28:03 pm
content: Quote from: Mechanical Menace on July 31, 2015, 02:10:05 pmWhat do you mean, is this not a motor either?
Memristor No. 2? 3D XPoint  from Intel-Micron - Page 1
Forum section: electronics / general

author: wraper
author_rank: Unknown
timestamp: July 31, 2015, 09:01:46 pm
content: So a few days ago intel announced that we'll soon see some new memory type but don't say what exactly it is. Made some fancy pancy video.http://www.anandtech.com/show/9470/intel-and-micron-announce-3d-xpoint-nonvolatile-memory-technology-1000x-higher-performance-endurance-than-nand

author: miguelvp
author_rank: Super Contributor
timestamp: July 31, 2015, 09:23:19 pm
content: Interesting,It seems they are expanding on their 3D gate techhttps://www.google.com/search?q=intel+3d+gate&es_sm=93&tbm=isch
Xbox One - What is this ESRAM - Page 1
Forum section: electronics / general

author: XDroidie626
author_rank: Contributor
timestamp: July 30, 2015, 12:46:32 pm
content: So I understand how ram and how stacked ram works but what is this ESRAM, is it like a cache or something?Anyone able to explain it to me on a lower level or more engineer level?Sorry its short but I don't really know what to ask about it outside of what is it?Oh and I'm asking because I am thinking of getting a XboneThanks

author: DJohn
author_rank: Regular Contributor
timestamp: July 30, 2015, 01:21:07 pm
content: It's a bit like a cache, in that it's a block of high-speed memory embedded in the GPU. The difference is that a cache automatically manages what's in it, based on what data has been accessed recently, and it's always backed by external memory. ESRAM has to be managed through software (most likely by the games themselves). It's like an extra block of memory tacked onto the end, which happens to be much faster.Its size is limited, so it's important to choose carefully what goes in there. I can see that being a headache for developers of multi-platform games (since PC and PS4 don't have to worry about it).It's not the sort of thing you go choosing a console on though. Which has the exclusives that you can't do without? If you're into multiplayer, which is the one that your friends use? Which controller do you find most comfortable? Much more important questions.

author: miguelvp
author_rank: Super Contributor
timestamp: July 30, 2015, 06:55:48 pm
content: Quote from: mojo-chan on July 30, 2015, 02:41:20 pmI'll just put this in here, since I can't comment first hand:http://www.gamespot.com/articles/directx-12-a-game-changer-for-xbox-one-and-pc/1100-6427422/

author: Mechanical Menace
author_rank: Super Contributor
timestamp: July 30, 2015, 07:26:16 pm
content: Quote from: miguelvp on July 30, 2015, 06:55:48 pmNot according to MS as far as the XB1 is concerned.EDIT:Also GNM seems very similar to Vulkan, Mantle, Metal and DX12 to begin with.

author: Mechanical Menace
author_rank: Super Contributor
timestamp: July 31, 2015, 02:58:56 pm
content: Quote from: mojo-chan on July 30, 2015, 11:10:22 pmI know the PS4s GPU has slightly more stream processors but would it really give such a performance hit given the higher clockspeeds of the XB1s APU? They could also use the faster CPU cores to make up for a bit.
Forever 21 Thread Screen - Page 1
Forum section: electronics / general

author: tszaboo
author_rank: Super Contributor
timestamp: July 30, 2015, 09:36:13 pm
content: Such a unique idea. I had to share it with you.F21ThreadScreen.comQuoteI'm not affiliated with this project.

author: German_EE
author_rank: Super Contributor
timestamp: July 30, 2015, 09:46:32 pm
content: OK, that's neatSo far we've had dancing penguins and loops of colored cloth on rolls. Any other ideas for a low-res display?

author: Mechanical Menace
author_rank: Super Contributor
timestamp: July 30, 2015, 09:49:00 pm
content: I can spin and weave. I really hope that isn't the only reason I think this is very cool.Quote from: German_EE on July 30, 2015, 09:46:32 pmMinecraft can be cool for that. No I am not ashamed of saying that.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 30, 2015, 10:01:39 pm
content: Ah, the venerable DS1052E shows up on the video...(BTW, the screen is pretty cool)

author: amyk
author_rank: Super Contributor
timestamp: July 31, 2015, 12:18:26 am
content: Quote from: German_EE on July 30, 2015, 09:46:32 pmSimilar material:http://travisgoodspeed.blogspot.ca/2010/12/hacking-knitting-machines-keypad.html

author: Rick Law
author_rank: Super Contributor
timestamp: July 31, 2015, 04:15:36 am
content: Quote from: German_EE on July 30, 2015, 09:46:32 pmA bunch of fans sitting in specific seats in a stadium each holding different color cards. They raise different color card on cue. That is low res but done in many different kind of stadium games.While this is common in modern day football (and other) games, I wonder had the Romans tried that. Pure congesture on my part. Imagine: Caligula makes certain signal, and the fans in the Colosseum raise purple cards together display a dot matrix word saying (in Latin, of course) "Good Horse Makes Better Senators."