hybridfree/eevblog-posts huggingface dataset:
EMI and Large Switching Planes - Page 1
Forum section: electronics / general

author: tom66
author_rank: Super Contributor
timestamp: January 26, 2013, 02:23:27 am
content: I'm designing a little buck converter (5V @ 3A out from 6.5~50V in.) I'm using a reasonably cheap PMOS because cost is important.Currently I've got a plane like below... that large area is connected to the DRAIN of my FET and feeds the inductor. The layout around the inductor, bucking diode and vin/vout caps is very small so I'm happy there. But I'm worried about the datasheet saying large planes are a bad idea for EMI. I figure there's going to be large currents flowing through it, which makes it an antenna - not good.So, what if I chopped up the plane somewhat, so that there was still a very similar area, but most of it didn't go anywhere? As in, no connection, so no current? Would this reduce EMI but still provide effective thermal management?I have to dissipate about 1.3W at peak load (DPAK), with an ambient temperature of around 40°C. Even though I may be able to manage this with a small heat pad, I'm hoping to remain below a die temperature of 80°C, for reliability and longevity qualification.Note: On the PCB the diode footprint is the wrong way around. I haven't yet got around to correcting it. The striped end is connected to ground (this is actually the anode.)Any advice from those who have done buck converter layouts before is much appreciated.

author: Shuggsy
author_rank: Regular Contributor
timestamp: January 26, 2013, 03:48:19 am
content: How important is EMI to your application? If you have sensitive circuits around and can absorb the cost, a 4-layer board would enable you to put a ground plane right under the switching power plane. This would provide very good EMI reduction. If going to a 4-layer board is out (you mentioned cost was an issue), then is there any way you could switch the power on the top layer and keep the bottom as a ground plane? Keeping a ground plane right under/over your switching section can help a lot with EMI.Some examples are in the Linear Technology app note 139:Power Supply Layout and EMIAlso, in regards to cutting up the plane, efforts should be concentrated on reducing the size and shielding the loop producing the EMI rather than giving the current odd paths to flow around. This might work alright when you want to isolate some digital and analog sections on a ground plane since it can further isolate current loops, but for these purposes I don't think you'll get much improvement.
Who knows The Secrets Of The Black Magic Box ? - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: January 24, 2013, 09:04:37 pm
content: Chinese electronics recycle fun or what's inside gsm to landline phone terminalyou have to admit that it’s interesting to see a fully populated cellphone board creatively soldered into a consumer product.http://blog.avrnoob.com/2013/01/chinese-electronics-recycle-fun-or.html

author: Smokey
author_rank: Super Contributor
timestamp: January 24, 2013, 10:24:26 pm
content: Now what would be truly sick would be if the phone was running osmocomBB.http://bb.osmocom.org/trac/

author: amyk
author_rank: Super Contributor
timestamp: January 25, 2013, 08:28:12 am
content: Not surprising, some wireless routershave a complete wireless card inside. They avoid having to design the tricky RF and signaling bits.

author: codeboy2k
author_rank: Super Contributor
timestamp: January 25, 2013, 07:37:39 pm
content: I think that was also done with the early linksys models for time-to-market issues. It's much faster to make a box with mini-PCI and throw in a card then to make a complete board with the, as you said, tricky wireless stuff onboard.Later linksys models included wifi chipsets, and then when Broadcom made complete wifi SOCs they designed around these single chip solutions.I like the older models. I have one like that too, with a mini-PCI card in it, for 802.11b I think it is. I figured with the alternative firmware I could probably upgrade it to a N model.I also have an older Intel access point.. that one has a PowerPC chip and a complete PCMCIA card inside it. Could probably upgrade it too, but the Intel firmware won't support a newer card, and there's no open source firmware for this AP. So this one I leave for another day when I have time to hack on it myself.

author: peter.mitchell
author_rank: Super Contributor
timestamp: January 26, 2013, 01:32:07 am
content: A friend of mine has one of those boxes, never did i suspect.
Freelance Electronics Design - Page 1
Forum section: electronics / general

author: PICmonster
author_rank: Regular Contributor
timestamp: January 25, 2013, 04:54:30 pm
content: Dear AllI design electronics circuits for a living but would like to pursue other projects outside work. I have tried PeoplePerHour & Freelancer.com etc but I must say I am not that impressed with how these site operate and would prefer a more personal way of doing things, on these sites as you have to build up you credibility and adhere to the rules which are not generally in the Freelancer best interest but the sites do make money that way. The is also a lot of time wasters on there.Where can I get freelance work from, is there a forum somewhere, how do I go about this, is there a recommended place to advertise my skills to engage in projects for a fee?Any help on this would be appreciated.

author: 8086
author_rank: Super Contributor
timestamp: January 25, 2013, 05:00:21 pm
content: My advice would be to set up yourself a nice website, get it to the first few pages of google with relevant keywords, and if it's good people will come to you, in my experience.Being part of a "labour pool" is not the answer, imo.Maybe through work contacts you can spread yourself around a bit?

author: AndyC_772
author_rank: Super Contributor
timestamp: January 25, 2013, 06:37:13 pm
content: I looked at one or two of those sites too, and my concern was that jobs tend to get steered towards the lowest bids.That's not good for anybody. Experienced professionals who will do a good job are never going to bid less than people whose skills aren't up to scratch and who can't get work any other way. That pushes down the perceived value of expert engineering time, which is bad for our profession generally, and at the same time means that customer jobs get done by the people who bid low and therefore are unlikely to represent us in the best light. It's a lose/lose situation.Maybe you'd get lucky and happen to get a job for a company which ends up offering you repeat business. They're certainly the best customers to have; you get to know the people, the products, their way of working, and what they do and don't expect you to do for them. Certainly if you do a good job the first time, you have a very good chance of being their first port of call when something new comes up.Most of my customers are people who have seen my work before in some context, ie. former colleagues, manufacturers, subcontractors and so on. I have no web site and I don't advertise, other than mentioning to people in person what I do and handing out business cards.
Rigol DS1102E rotary encoder knobs don't work right!? - Page 1
Forum section: electronics / general

author: x18
author_rank: Contributor
timestamp: November 13, 2012, 11:13:25 am
content: hi,i got a little problem with my rigol oscilloscope. the rotary encoder knobs for voltage and time scale don't work right anymore. the scope ist about two years old now. when i rotate those knobs in one direction the scale on the screen sometimes goes up, sometimes down but not in one direction. what can i do? can i replace them with high quality encoders? or could dust be the problem? i have no idea what to do but it's very annoying!greetings.

author: tom66
author_rank: Super Contributor
timestamp: November 13, 2012, 12:18:20 pm
content: The encoders are likely dirty; sometimes contact cleaner can work (if they are electronic rotary encoders, and not optical.)

author: darrylp
author_rank: Regular Contributor
timestamp: November 13, 2012, 12:25:17 pm
content: Search forum, someone had faulty encoders on this scope before. Pics of encoder taken apart. Part no.s etc. Possible replacement and upgrade parts discussed if I remember correctly.Sent from my HTC One X using Tapatalk 2

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 13, 2012, 12:53:34 pm
content: Problem with rigol scope knobRigol DS1052E Annual Service (Knob Problem)i've bought 6 encoders from itead, but not sure if they are compatible. if i have time i will try to fix my problematic knobs (after repairing it once about a year ago) and report back. i thought if the encoders are not compatible, they still be usefull for my next project. the itead's encoders are "snap-snap" type when you rotate, similar to V/div and S/div adjustment, but not the smooth type rotation as the others rigol knobs.

author: Rick
author_rank: Frequent Contributor
timestamp: January 27, 2013, 09:27:47 pm
content: How often does that knob problem occur? Is it worth paying about $200 more and buy from a local seller because of the warranty?
Don,t watch this if you are squeamish about electric shocks - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: January 21, 2013, 10:26:01 pm
content: These two Dutch men undergo the pain of being in labor for research purposes, makes you wonder who came up with the apparatus, the CIA perhaps.http://youtu.be/ZlsPXpR2ORU

author: ftransform
author_rank: Frequent Contributor
timestamp: January 22, 2013, 12:49:26 am
content: They did it to get laid!I wonder how many of those are in guantanamo bay!

author: 8086
author_rank: Super Contributor
timestamp: January 22, 2013, 01:03:07 am
content: What I find interesting is how this is framed as a failure by men, do they not think that women would stop after a couple of hours too? If men were actually in labour, they wouldn't have a choice, and after the birth they could go on about how much pain they endured till the cows come home, just like women.Not to mention that these electric shocks aren't even going to be like the sensation of contractions that women experience during labour.

author: G7PSK
author_rank: Super Contributor
timestamp: January 22, 2013, 04:49:31 pm
content: I would think lot's of them are in Guantanamo bay, after all if they get caught out using torture the politicians and government lawyers can deny it and say that the prisoners are not experiencing anything more than nearly 50% of the population would on occasion.

author: M. András
author_rank: Super Contributor
timestamp: January 22, 2013, 09:23:20 pm
content: it was fun to watch. btw i would gladly try this out

author: StuUK
author_rank: Frequent Contributor
timestamp: January 22, 2013, 09:57:28 pm
content: Quote from: M. András on January 22, 2013, 09:23:20 pm"Gladly" Are you sure you're on the right website

author: M. András
author_rank: Super Contributor
timestamp: January 22, 2013, 10:05:17 pm
content: yeah im sure but this looks like fun for me, for teaser shocks i would say no

author: G7PSK
author_rank: Super Contributor
timestamp: January 23, 2013, 05:28:03 pm
content: My wife has one of those slendertone belts that stimulate the abdominal muscles electrically, that is most uncomfortable at the top settings.
3D Printer Hot End power consumption ? - Page 1
Forum section: electronics / general

author: Otatiaro
author_rank: Regular Contributor
timestamp: January 24, 2013, 03:47:23 pm
content: Hello,Was wondering, do somebody measured the power consumption of a 3D Printer hot end ?I know the heating bed can go up to 10A at 12V, but have no idea for the hot end (should be a lot less) ...Thomas.

author: george graves
author_rank: Super Contributor
timestamp: January 24, 2013, 04:53:38 pm
content: It depends on the type of hot end, the temp you are running it at(different temps for different materials)I believe the heater is usually PWM'ed so - there's that too. But for example, a J-head hot end uses a 5W resistor( 5.6 ohm, 1%, 5W ) as it's heating element - but I believe they overdriveing it at times, and that's one of the reasons the resistor fails.Not sure if that helps.Why are you asking? What are you trying to figure out?
The Two Thousand Year Old Computer. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: January 20, 2013, 06:28:23 pm
content: Just saw another documentary for theAnticythera mechanism. I liked a lot and just wanted to share it.Alexander.

author: ftransform
author_rank: Frequent Contributor
timestamp: January 21, 2013, 09:14:08 am
content: Quote from: firewalker on January 20, 2013, 06:28:23 pmI wonder if the maker of that had a long grey beard!

author: justanothercanuck
author_rank: Frequent Contributor
timestamp: January 21, 2013, 09:23:10 am
content: Watched this several hours ago... it may not have been electrical, but it was certainly interesting. I'm usually not big on Greek history/mythology.

author: Gall
author_rank: Frequent Contributor
timestamp: January 22, 2013, 11:42:12 am
content: I really like this description:

author: firewalker
author_rank: Super Contributor
timestamp: January 22, 2013, 11:54:39 am
content: I was staring at it for an hour when I visited the museum (before the complete solution of the puzzle). A magnificent piece of engineering.http://www.antikythera-mechanism.gr/http://www.hpl.hp.com/research/ptm/antikythera_mechanism/http://www.hpl.hp.com/research/ptm/antikythera_mechanism/full_resolution_ptm.htmAlexander.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 22, 2013, 12:12:41 pm
content: I love the attitude of the guy from theX-ray companyto build a custom machine for the job - I wonder if he'd be able to do something like this now that they are part of Nikon.Would be interesting to know if this led to more work/sales afterwards.Looks like maybethis machineis a result of the developmentMore info herehttp://www.xtekxray.com/applications/antikythera.html

author: firewalker
author_rank: Super Contributor
timestamp: January 22, 2013, 12:15:18 pm
content: Xtek was a UK based company?Alexander.
Jim Williams Books - Page 1
Forum section: electronics / general

author: free_electron
author_rank: Super Contributor
timestamp: January 17, 2013, 08:17:44 pm
content: Analog Circuit Design by Jim Willims And Bob Dobkin , has been around for a while , and is a collection of Jim Williams Appnotes and other publications., but now there is Volume 2 ! With even more Jim Williams stuff (1250 pages )YBoth are available with a substantial 30% discount thru Linear's website :http://www.linear.com/designtools/acd_book.phpI got mine yesterday

author: marshallh
author_rank: Unknown
timestamp: January 17, 2013, 08:36:38 pm
content: Thanks for the heads up. Picked up the first one

author: dfnr2
author_rank: Regular Contributor
timestamp: January 18, 2013, 07:56:18 pm
content: Care to post a quick review? I have treasured my copies of the Linear Applications Handbook volumes while in grad school in the 90's, alongside the NS Linear Applications Handbook. To me those handbooks are absolute classics. Especially for the Linear notes, there is so much collateral wisdom embedded in the discussion of the main topic, you can read them over and over and find something new each time.I'm really curious, do these books add any new material, or are they straightforward presentations of the app notes? Of course that is a value as well, since the handbooks are hard to come by nowadays, and having an index and table of contents, IMO, could significantly open up the content.I really love having these notes in book form--while having the info online is of course and indispensable boon, the experience and value of the online notes is different and complementary.

author: free_electron
author_rank: Super Contributor
timestamp: January 18, 2013, 10:12:41 pm
content: Quote from: dfnr2 on January 18, 2013, 07:56:18 pmah, good old blue an whitey. there's actually 3 of em. i still keep those around. i also have a rally old apps book from PMI ( precision monolithics ) those were really good apps books as well.

author: saturation
author_rank: Super Contributor
timestamp: January 19, 2013, 05:32:05 pm
content: Anything by Jim Williams is worth the money. Thanks freee! for the heads up.

author: dfnr2
author_rank: Regular Contributor
timestamp: January 20, 2013, 05:23:48 pm
content: So, any comment on the comparison between these books and the Linear Tech App note books?

author: mazurov
author_rank: Frequent Contributor
timestamp: January 22, 2013, 04:07:31 am
content: Amazon allows to "Look inside" the book. It seems like vol.2 is a lot like vol.1, i.e., reprints of app.notes.http://www.amazon.com/Analog-Circuit-Design-Immersion-Black/dp/0123978882/ref=sr_1_1?s=books&ie=UTF8&qid=1355267411&sr=1-1&keywords=analog+circuit+design+volume+2

author: johnboxall
author_rank: Unknown
timestamp: January 22, 2013, 06:02:40 am
content: Interesting, thanks for that. Just ordered the set.
Recommendation on bench top MAT - Page 1
Forum section: electronics / general

author: IvoS
author_rank: Frequent Contributor
timestamp: January 22, 2013, 01:11:30 am
content: I am looking for some mat to put on my bench but I am not sure if I should go with anti-static mat something like thishttp://www.all-spec.com/products/FTW110DB.htmlor just some kind of protective rubber isolating material. Share your ideas, experience and what you personally use and recommend. My working area would be something like 2x3 - 2x4 ft. Price range <$80.

author: Fsck
author_rank: Super Contributor
timestamp: January 22, 2013, 01:18:42 am
content: I like the Scientific Americas blue rubber ones.I'd guess there's a better source for them in the states, but as I'm Canadian- I buy from ebay:http://www.ebay.ca/sch/canvu0_0/m.html?_nkw=&_armrs=1&_from=&_ipg=&_requireRaptorProxy=false

author: notsob
author_rank: Frequent Contributor
timestamp: January 22, 2013, 01:29:23 am
content: AND for those in OZ, Mektronics have 10m rolls of antistatic matting on their January 2013 specials list, both 600mm wide and 900mm wide.

author: EEVblog
author_rank: Unknown
timestamp: January 22, 2013, 02:00:46 am
content: The Blue rubber ones are by far the best, worth every cent.So that one you linked looks perfect.Dave.

author: IvoS
author_rank: Frequent Contributor
timestamp: January 22, 2013, 02:20:13 am
content: Thanks.

author: Kilroy
author_rank: Regular Contributor
timestamp: January 22, 2013, 02:41:56 am
content: I use the Scientific Americas mats and have been quite satisfied with them.In any event, make sure to go with rubber over vinyl. And, I prefer a textured surface...keeps stuff from skidding about when your poking and prodding away, plus things like small screws don't seem to have the same annoying tendency to roll away before they are captured.Oh, and avoid any impulse to choose a color other than blue just to be different. Colors in the blue spectrum are supposed to have a more calming influence on our psyche and help our focus and concentration.Then again...that last bit could be utter rubbish.

author: notsob
author_rank: Frequent Contributor
timestamp: January 22, 2013, 03:04:01 am
content: Microsoft's BLUE screen of death wasn't all that soothing

author: SoftwareSamurai
author_rank: Regular Contributor
timestamp: January 22, 2013, 03:47:12 am
content: I bought a couple oftheseon eBay and they are very nice.

author: mazurov
author_rank: Frequent Contributor
timestamp: January 22, 2013, 03:56:33 am
content: My favorite are Velleman's anti-static mats, available in several sizes. They are pretty cheap here in the states.http://www.vellemanusa.com/products/view/?id=350001
ATMEGA chip without an Arduino Board - Page 1
Forum section: electronics / general

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 21, 2013, 08:01:13 pm
content: Hello i recently heard that you can use any Atmel chip without an arduino board (the mega i have is an smd one and i would like to know if i can make one using a breadboard)Is this possible?

author: Kremmen
author_rank: Super Contributor
timestamp: January 21, 2013, 08:24:37 pm
content: But of course you can.Arduino uses an Atmel chip, but an Atmel chip does not use Arduino, if you get my meaning.Just check fromwww.atmel.comand you will see what i mean.Breadboarding with SMD chips is possible but you may need a special breakout board to enable conections from the chip to the board

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: January 21, 2013, 09:05:35 pm
content: Kremmen summed it up. Here is a link to a YT video done by one of our members (FenderBender) the is a very good start to understanding how it all works:https://www.eevblog.com/forum/chat/first-youtube-video-ever-microcontrollers/msg184015/#msg184015

author: UPI
author_rank: Regular Contributor
timestamp: January 21, 2013, 09:37:10 pm
content: Here is a good source of info on building your own Atmega based board.http://www.theparsley.com/arduino/diy/#intro
New Arduino - Page 1
Forum section: electronics / general

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 21, 2013, 07:04:46 pm
content: My arduino mega will arrive very soon and i need some ideas for simple projects to do with it

author: Achilles
author_rank: Regular Contributor
timestamp: January 21, 2013, 07:13:32 pm
content: What are you interested in? There could be a lot done with it, but it's getting more interesting when you attach peripherals. If you don't have any experience at all, check out the Arduino Playground for some basic stuff to try out.Do you want to try out basic robotics, environmental monitoring, Datalogging, a game, some crazy stuff?!http://playground.arduino.cc//Projects/Ideas

author: StubbornGreek
author_rank: Frequent Contributor
timestamp: January 21, 2013, 07:39:56 pm
content: The word clock seems like a fun project (there's tons of tutorials on this one out there).

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 21, 2013, 07:57:17 pm
content: Quote from: Achilles on January 21, 2013, 07:13:32 pmHello thank you.I am a lot interested and i dont have any exp but i know how to program it and use it(basic stuff)

author: ChrisGreece52
author_rank: Frequent Contributor
timestamp: January 21, 2013, 07:58:20 pm
content: Quote from: StubbornGreek on January 21, 2013, 07:39:56 pmyeah i think this will be my first project
ESR/LCR Tweezer. - Page 1
Forum section: electronics / general

author: PeterG
author_rank: Frequent Contributor
timestamp: January 20, 2013, 10:39:32 pm
content: Hi all,has anyone played with one of these?eBay listing.http://www.ebay.com/itm/Smart-Tweezers-ST5L-LCR-ESR-Meter-Multimeter-SMD-Capacitor-Tester-agilent-/121054047533Product Pagehttp://www.advancedevices.com/Interested to know if it works as advertised.Regards

author: notsob
author_rank: Frequent Contributor
timestamp: January 20, 2013, 10:53:27 pm
content: Haven't used them, but here's a bit I marked some time agohttp://www.advancedevices.com/

author: tom66
author_rank: Super Contributor
timestamp: January 20, 2013, 11:19:22 pm
content: Dave has a review.

author: casinada
author_rank: Frequent Contributor
timestamp: January 21, 2013, 04:50:37 am
content: I wonder if these are worth anything?http://www.ebay.com/itm/CEM-Brand-Electronic-Components-Tester-Digital-Multimeter-automatic-scan-DC-AC-/121019113927?pt=LH_DefaultDomain_0&hash=item1c2d4d21c7Probably this would be cheaper if you have an LCR meter already or a regular DMM.http://www.ebay.com/itm/SMD-Test-Clip-Meter-Prob-For-Resistor-Tweezer-Capacitor-Component-Multimeter-/130686243105?pt=LH_DefaultDomain_0&hash=item1e6d81d121It might not be as fancy or convenient. But then, you can never have enough tools

author: JoeyP
author_rank: Frequent Contributor
timestamp: January 21, 2013, 05:22:11 am
content: Quote from: casinada on January 21, 2013, 04:50:37 amI tried the BNC/kelvin connected version of these tweezers from China. There is no shielding at all in the handles, so they are very sensitive to hand movement and any other stray capacitance. Useless for low value capacitance measurements, but might be fine if you only need to do simple resistance measurements.

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: January 21, 2013, 10:26:25 am
content: Quote from: casinada on January 21, 2013, 04:50:37 amWell,CEM Makes Some amazing Tools ->http://www.cem-instruments.com/.I Am Sure This is Not a amazing Tool Though Lol .The second one is utterly butterly hopeless lol

author: dr_p
author_rank: Frequent Contributor
timestamp: January 21, 2013, 12:13:16 pm
content: Quote from: casinada on January 21, 2013, 04:50:37 amSeems the same unit as these:

author: bitwelder
author_rank: Super Contributor
timestamp: January 21, 2013, 06:31:26 pm
content: Or go DIY:http://www.xyphro.de/blog/comments.php?y=12&m=12&entry=entry121227-233617
How are "standard" voltages determined? - Page 1
Forum section: electronics / general

author: MikH
author_rank: Newbie
timestamp: January 21, 2013, 05:56:04 am
content: Hey,Just curious, does anyone know how the standard voltages (5V, 3.3V, etc) were originally decided upon? Is there some cabal that decides this kind of thing?

author: ftransform
author_rank: Frequent Contributor
timestamp: January 21, 2013, 06:47:44 am
content: If there was a cabal then it would be 6.6 volts!

author: Simon
author_rank: Unknown
timestamp: January 21, 2013, 07:03:35 am
content: I'm guessing roughly randomly but bearing in mind what the components needed and could withstand on a physical level.You will find that 3.3V is 2/3 of 5, the first attempt at lowering processor consumption, and after that 1.6V which is about 1/2 and from then it was about how low can we go without crashing the processor, because the lower the voltage the less heat and the more stable, but there will be a sweetspot below which the voltage is not enough to keep the speed as more voltage means faster speeds but you much watch the heat because more heat means slower switching - Ah the fie art of overclocking.......

author: ejeffrey
author_rank: Super Contributor
timestamp: January 21, 2013, 07:51:36 am
content: Most of the values are from the E12 series of preferred values. I would guess that is why 3.3 V instead of say 3.1. The notable exception is 5V, presumably chosen for being 5.In specialized cases with strong power/performance constraints like PC DRAM banks, finer steps are common.

author: Simon
author_rank: Unknown
timestamp: January 21, 2013, 08:10:56 am
content: Well now that we have stopped wowing over processors that can work faster than we can see an LED flash at "standards" have been abandoned and fine tuning to squeeze the most possible has taken over. New processors work on 1.2V and the steps are like 0.05V

author: saturation
author_rank: Super Contributor
timestamp: January 21, 2013, 04:59:49 pm
content: I think its a mix between practical design noise immunity [ buses, cables etc.,], fastest logic switching speed and power dissipation.When TTL became the workhorse logic, 5V became the defacto standard, as different logic families came to be and excelled over TTL, like CMOS, they maintained the 5V to maintain compatibility; there are were hybrid designs using both technologies as logic evolved over time, and now that TTL is mostly obsolete, designers can lower rail voltages to those of the modern chipsets.http://en.wikipedia.org/wiki/Logic_family#Monolithic_integrated_circuit_logic_families_compared
Real-life Mario Kart is the best use ever for RFID. - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: January 21, 2013, 03:45:56 pm
content: http://www.slashgear.com/forget-mobile-payments-real-life-mario-kart-is-the-best-use-ever-for-rfid-21266052/Alexander.
Bad physics education + desperate marketing + cell phones = ??? - Page 1
Forum section: electronics / general

author: smashedProton
author_rank: Frequent Contributor
timestamp: January 23, 2013, 03:39:27 am
content: http://hps.org/hpspublications/articles/powerlines.htmlWe are all going to die!!Psuedo-science is taking over!

author: AlfBaz
author_rank: Super Contributor
timestamp: January 23, 2013, 12:36:17 pm
content: Not quite sure what your stance is herePerhaps I missed something but it seems to me that the article is saying the were localised pockets of leukemia in and around power lines, The scientists have not been able to link low em fields to cancer and the majority of studies support this. It goes on to say that some research into this continues.It may very well be a case of, if you are in a small enclosed yard with an agitated elephant you are unlikely to notice the small clump of poison ivy

author: tom66
author_rank: Super Contributor
timestamp: January 23, 2013, 01:10:03 pm
content: Studies like this have been examined before, and they always fall foul to three factors: confirmation bias, correlation != causation and poor statistics implementation.It is, indeed, true that pockets of leukaemia are found around power lines. But, do you know what else is found around power lines... lots of families, including lots of children. There are less power lines in the country side passing near houses and less families with children in the countryside. So, it would be natural to see a small increase in childhood leukaemia around such power lines.It's very similar to the one I saw in the Daily Mail recently, about asthma being more common around places with power lines within 100m... well, there's also a lot of smog in cities like that, so that's more likely to be the cause, rather than a bit of 50Hz (with limited power across a few more harmonics.)

author: rsjsouza
author_rank: Super Contributor
timestamp: January 23, 2013, 03:07:25 pm
content: Similarly to what the article concludes, I've seen several studies published on IEEE and its related societies and they all fail to reach a conclusion due to the complexity of having a clear correlation. The only thing in common I have seen is there is an effect on the surroundings of power lines, cell phones, etc., but with no way to prove harm or benefit.

author: SeanB
author_rank: Super Contributor
timestamp: January 23, 2013, 04:26:13 pm
content: Common thing as well is power lines tend to be strung alongside roads ( go figure, they need to get a truck out to build and service them, they are very expensive to fly in) where cars drive, which were often running leaded fuel, and often the houses built there used coal for heating.
electronic shop in Vancouver/BC or surrounding - Page 1
Forum section: electronics / general

author: hammy
author_rank: Unknown
timestamp: January 22, 2013, 09:16:08 am
content: Hi,I'm going to visit Vancouver/Canada (and then BC by car) in a few month and I want to ask if there is any good electronic shop. I'm searching for a walk-in shop to see some fluke and/or agilent multimeter, and I also want to visit a good bookshop with electronic books.With google maps I only found two stores in the Main St (Lee's and Main Electronics), but I don't know if they are the kind of store I'm searching. Especially for the books I'm searching a specialist bookshop.Some hints would be great, thank you!PS: If there are some other places a EE must see, like some surplus warehouses, please give me also a hint for this.

author: ve7xen
author_rank: Super Contributor
timestamp: January 22, 2013, 09:42:11 am
content: I don't know of any really great places, but if anyone else does I'd love to find out about them!Lee's and Main Electronics both cater mostly to hobbyists. Lee's has a lot of Arduino-esque gizmos for the arty crowd, Main Electronics has a bit better selection of components, enclosures etc. in my experience. Neither carry any decent test equipment or much specialty stuff. There's also MRO near Burnaby that I haven't been to yet, and RP Electronics who seem to sell Agilent and Fluke kit, so you might find demo units there, but I doubt they keep stock of the high end stuff.
Superman RC. - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: January 20, 2013, 03:01:38 pm
content: Love to see peoples faces when they get buzzed by one of these.http://youtu.be/zpO1D23IWhw

author: notsob
author_rank: Frequent Contributor
timestamp: January 20, 2013, 08:21:16 pm
content: Years ago, at an airshow, I saw a RC copter dressed up as a witch on a broom, very impressive.
Electronic Magazines [ List And Subscription Type ]  - Page 1
Forum section: electronics / general

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: January 20, 2013, 07:14:25 pm
content: Hello everyone ,I would like to have a thread in which we could have a list of Electronic Magazines And thier subscribtion types .Something like this1 : Silicon Chip [www.siliconchip.com.au] , [ Paper ] , [ Online Only No PDF ]2 : Etc Etc.Can people please make a list of Electronic Magazines "That They Know " .Even Regional Once .I Will Then Update The First Post With This List .Will Be Handy for Someone looking for the same in future .

author: SLJ
author_rank: Frequent Contributor
timestamp: January 20, 2013, 07:21:56 pm
content: Here's a couple I get:http://www.nutsvolts.comNuts and Volts - Hard copy and on-linehttp://www.electronicproducts.comElectronic Products - Hard copy and on-line

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: January 20, 2013, 07:31:22 pm
content: Quote from: SLJ on January 20, 2013, 07:21:56 pmSir ,Online Will Have Two Definations [ Only Viewable Online Or PDF Download ] ,Whats It With These Two .Reply So That i Could Update First Post .

author: ttp
author_rank: Regular Contributor
timestamp: January 20, 2013, 10:08:12 pm
content: Circuit Cellar - Hardcopy and PDF downloadhttp://circuitcellar.com/Elektor - Hardcopy and PDF downloadhttp://www.elektor.com/EPE - Hardcopy and online view onlyhttp://www.epemag3.com/

author: cwalex
author_rank: Frequent Contributor
timestamp: January 21, 2013, 03:12:52 am
content: www.nutsvolts.comprint and pdf download (you can view online as well)www.elektor.comprint and pdf download

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: January 21, 2013, 10:29:25 am
content: Hello ,Guys Keep The Pressure on.I am gonna update post no 1 at night ISD " Indian standard time "
Delorean Hovercraft - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: January 19, 2013, 07:22:06 pm
content: Greetings EEVBees:--Dave needs one of these.http://blog.sfgate.com/hottopics/2013/01/17/hovering-delorean-spotted-near-golden-gate-bridge/"Stay on the bomb run, Ace. I'm goin' down below and see what I can do...Stay on the bomb run, boys. I'm going to get them doors open if it harelips everybody on Bear Creek."Major T. J. King Kong, Slim Pickens (from Dr. Strangelove)Best RegardsClear Ether

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: January 19, 2013, 07:36:19 pm
content: LOL Nice copy of what Jesse James did with Monster Garage ...

author: Skimask
author_rank: Super Contributor
timestamp: January 20, 2013, 04:22:17 am
content: Except that "Jesse James" did it on a pseudo-reality TV show where everything was paid for by that particular TV network and everything was scripted for maximum ratings and viewership by the sheep that subscribe to that garbage.
Practical Electronics for inventors - Page 1
Forum section: electronics / general

author: casinada
author_rank: Frequent Contributor
timestamp: January 20, 2013, 12:10:58 am
content: It is finally out, 3rd edition, 1014 Pages. Just got it in the mail. Haven't had the chance to browse too much. The Table of contents, 47 pages, and the index of the book are posted at Amazon if you want to take look to see what's inside and you're not familiar with the previos editions.
Rice Develops Carbon Nanotube Fiber Thread  -  Fee  Fi  Fo  Fum - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: January 19, 2013, 10:38:13 am
content: Greetings EEVBees:--The Beanstalk is still a way off, but surely Carbon Nano-Tube Fiber Thread is a step on the way to one. Please see the below link for an article about Rice University R&D on this new strong conductive thread.http://www.theregister.co.uk/2013/01/14/carbon_nanotube_threads_spun/"No burden is so heavy for a man to bear as a succession of happy days."Max Planck 1858 - 1947Best RegardsClear Ether

author: JoannaK
author_rank: Frequent Contributor
timestamp: January 19, 2013, 10:56:32 am
content: Neat .. I just <3 the science..
Looking for a good clamp-on ammeter to measure voltage in jaguar - Page 1
Forum section: electronics / general

author: kdewitt
author_rank: Newbie
timestamp: May 26, 2012, 02:24:56 pm
content: Hi all,I'm an ee in Atlanta, GA and Iv'e got a small project under way. My wife's 2005 Jaguar has a finicky air conditioner that I'm trying to debug. Found an incredible web site that has provided an huge amount of detail on how these things work - Here's the link;http://jaguarclimatecontrol.com/diagnose/You'll see they recommend using a digital clamp-on ammeter to measure the current of a couple of the wires on a harness in the car. These wires are quite small and I'm not sure if there is a clamp-on ammeter out there that would actually fit into this small space.Does anyone have any suggestions for a small clamp-on ammeter that I could use to help me diagnose this one?Thanks for any help!KD

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: May 26, 2012, 02:30:24 pm
content: Better change the title of the thread to measure "amps"

author: T4P
author_rank: Super Contributor
timestamp: May 26, 2012, 02:32:43 pm
content: A UNI-T clamp meter can be okay.Any you want, UT203/204 or even 207 but mostly 203 is okay, since it has DC 400amps and i don't think the compressor can draw that much

author: dcel
author_rank: Regular Contributor
timestamp: May 26, 2012, 04:42:36 pm
content: Buy this meterhttp://www.sears.com/shc/s/p_10153_12605_03482369000PCraftsman Digital Clamp-On AmmeterSears Item# 03482369000 | Model# 82369I work on automotive and heavy equip. electric every day and the multimeter that I had got busted up. It was another older Craftsman and I had good luck with it. I decided to get amp clamp, sears had one. Best little meter for auto work I have found, other than my flukes, but they don't get taken to work for any reason. $60usd well spent and I don't have to worry about damaging an expensive meter. I liked it so well that I bought a second one. Like Dave says, more meters the better, u cant measure voltage and current at the same time with one meter.Hope this helps...Chris

author: siliconmix
author_rank: Frequent Contributor
timestamp: May 26, 2012, 08:01:24 pm
content: you could fit one of these on the dashboard.looks cool toohttp://www.ebay.co.uk/itm/230798215920?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1586.l2649#ht_500wt_1063

author: kale-nard
author_rank: Newbie
timestamp: January 19, 2013, 08:21:15 am
content: What's involved in having a permanently installeddc clamp on amp meter? What kind of maintenance is required?

author: SeanB
author_rank: Super Contributor
timestamp: January 19, 2013, 08:46:11 am
content: Keep it clean and away from temperature extremes is about all. That and no corrosive atmospheres ( not near a battery for example) and they will last pretty near indefinitely.
EPE axes PDF electronic subscription - Page 1
Forum section: electronics / general

author: ttp
author_rank: Regular Contributor
timestamp: January 18, 2013, 12:15:21 pm
content: Decided to give them a go, made sure they do PDF format (I have limited/patchy internet access and online reading is mostly impossible). Subscribed in Oct 2012 and downloaded 3 issues. Trying to get Jan 2013 issue for a few days - 404 Not Found. Shoot off couple of emails - no response.Finally today Googled "epe subscription problem" and found out from a couple of forums that they are moving to proprietary online format - read online (with beta version offline reader for Windows which seems to crash for some). Quite unusable option for me - prefer Android devices to read and when have time for reading I don't have internet access.I'm pretty piss off with their move (and I thought Silicon Chip has pissed me off, this is worse). Pretty poor ignoring my emails too.They say piracy is the reason. The way I see it legitimate subscribers will have to adjust and some will go away (judging by forum posts). Pirates who subscribed to PDF version and distributed it will be able to take a screenshot of whatever format the magazine will come and produce pirated copy for distribution/cheap resale. So EPE gains nothing and likely looses subscribers, innocent subscribers are shafted as their access to magazine reading is limited and pirates job is made a bit harder, they probably don't care.My plan: I will try to get some of my money back and will stay away from EPE.One of the discussions I Googledhttp://www.chatzones.co.uk/discus/messages/1633/13937.html?1358086824

author: David_AVD
author_rank: Super Contributor
timestamp: January 18, 2013, 12:45:59 pm
content: I would love to change my Silicon Chip subscription to electronic (pdf) download. Their online only format is of no use or interest to me.If EPE changed the format after you subscribed, you should be entitled to cancel it and get a partial refund.

author: ttp
author_rank: Regular Contributor
timestamp: January 18, 2013, 11:49:02 pm
content: Looks like you are in similar situation, online formats may work well for daily newspaper but not for reference materials.Silicon Chip - I hoped new website will bring them forward, what a disappointment.

author: Dataforensics
author_rank: Unknown
timestamp: January 19, 2013, 02:37:55 am
content: Yes, have cancelled my subscription as a result, although they did send me my last two issues in dead tree form after I complained.They also quoted copy protection as the issue. I just hope circuit cellar do not go the same way.Still thats saved me a few quid a year.
I can't even tell what this is. - Page 1
Forum section: electronics / general

author: BigBrother
author_rank: Regular Contributor
timestamp: January 17, 2013, 10:47:50 pm
content: 4 NEW Hakko 936 Soldering Stations ESD Safethe bottom half is all business but the top half is... party?

author: G7PSK
author_rank: Super Contributor
timestamp: January 17, 2013, 10:54:13 pm
content: Vacuum pumps?

author: krivx
author_rank: Frequent Contributor
timestamp: January 17, 2013, 10:56:38 pm
content: There is a soldering iron, a "DC driver", and what looks like some motor assemblies on top. I would guess a transformer/coil winding station?

author: Deepak
author_rank: Regular Contributor
timestamp: January 18, 2013, 04:56:53 am
content: I was going to see who would be up for a group buy, but $471 shipping

author: BigBrother
author_rank: Regular Contributor
timestamp: January 18, 2013, 04:29:35 pm
content: Quote from: Deepak on January 18, 2013, 04:56:53 amI live in East Texas, just a couple hours out from Dallas. They're claiming some 50LBS per unit which makes shipping expensive still, international would be a small fortune.
Kenwood DLE 1041 true rms multimeter - Page 1
Forum section: electronics / general

author: Robbie
author_rank: Newbie
timestamp: January 18, 2013, 03:46:57 pm
content: Hi can any one advise me on the Kenwood DLE 1041 multimeter I am new to electronics and looking to buy a decent multimeter I have been offered the kenwood for GPd £90 IS that a good price? I am working on old tube guitar amps so I need something thats not going to kill me any help would be appreciated thanks .
Pomona cable - Page 1
Forum section: electronics / general

author: kcs
author_rank: Regular Contributor
timestamp: January 17, 2013, 09:59:12 am
content: Can anyone be kind enough to check if Pomona cable 5908A can be fitted with 6728 on one end and 5916A on another. I am a bit lost with with terminology.Pomona catalog ishere.

author: ve7xen
author_rank: Super Contributor
timestamp: January 17, 2013, 07:41:46 pm
content: Looks like you could, but if you're after binding post compatible banana plugs on one end, why not get the 6358 retractable sheath version instead?

author: kcs
author_rank: Regular Contributor
timestamp: January 17, 2013, 09:04:00 pm
content: Thank you!Can you explain how 6358 is different from 5908. I don't understand the meaning of "retractable sheath".Visually they look very similar:

author: ve7xen
author_rank: Super Contributor
timestamp: January 17, 2013, 10:18:12 pm
content: The retractable sheath is just that, the plastic safety sheath around the banana plug retracts when you try to plug it into a device using non-shrouded banana jacks. The datasheet says specifically:Quote
Amateur Builds Polywell From eBay Parts - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: January 17, 2013, 09:14:32 am
content: Greetings EEVBees:--Mark Suppes duplicates the Sydney Polywell experiment and then builds his own Polywell WB-6 from eBay parts. See below link for his Wired 2012 presentation. This presentation contains damn near every EEVblog buzzword in existence."An expert is a man who has made all the mistakes which can be made in a very narrow field."Niels Bohr 1885 - 1962Best RegardsClear Ether

author: Noize
author_rank: Regular Contributor
timestamp: January 17, 2013, 10:20:03 am
content: Why not hear it directly from the horses mouth.

author: poorchava
author_rank: Super Contributor
timestamp: January 17, 2013, 10:40:28 am
content: Probably the best line to pickup a girl being an engineer: "I have built a nuclear reactor at home"

author: TerraHertz
author_rank: Super Contributor
timestamp: January 17, 2013, 01:58:12 pm
content: Thanks so much for the Bussard video. Very interesting. I wasn't aware there were any of his talks available. When will I *ever* learn to google right?Some related links:http://focusfusion.org/http://www.fusor.net/http://www.coultersmithing.com

author: SeanB
author_rank: Super Contributor
timestamp: January 17, 2013, 06:55:24 pm
content: One of the last interviews with the good Doctor Bussard was on The Space Show. Worth a listen. 9 shows in all, just use the Guest search feature and look up the dates then download and listen to these. A very intelligent man there.
what happens if you "starve" a zener of current - Page 1
Forum section: electronics / general

author: Simon
author_rank: Unknown
timestamp: January 17, 2013, 02:35:34 pm
content: I'm doing a circuit with a zener in it as a pre-regulator to protect the 78L05. what would happen if the supply voltage dropped a bit and the zener and my circuit needed to compete for current ? would the zener be the gentleman or would my circuit start to loose current ? I am not after precise regulation from the zener it is just there as protection more than anything

author: grumpydoc
author_rank: Super Contributor
timestamp: January 17, 2013, 02:40:03 pm
content: There will be a resistor** before the zenner, the voltage drop across that will rise with increasing current. Once the voltage at the zenner drops below the zenner voltage the diode will simply stop conducting.Edit: **: Even if it's the inherent series resistance of the supply or wiring.

author: Simon
author_rank: Unknown
timestamp: January 17, 2013, 02:49:02 pm
content: right, that makes sense and just what I want

author: FJV
author_rank: Regular Contributor
timestamp: January 17, 2013, 05:53:31 pm
content: If I'm not mistaken you basically move along the right side graph of the zener caracteristic.
A Big thank You To EEVBLOG - Page 1
Forum section: electronics / general

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: January 17, 2013, 04:36:03 pm
content: Well,I decided in March 2012 that i will quit my computer business and migrate into electronics .Those days i came across eevblog . I Figured out that if i just do little stuff the right way and learn that told and asked in eevblog i will mate it man .This is what i did ,i might never meet dave in my life but i would like him to know the effect this website and forum had in my life .I Sell unique stuff but i know what the hell it is and how it can impact someone in his work .Thank you dave and everyone in eevblog . I really appreciate this .Does anyone else too have something to say like me ?