hybridfree/eevblog-posts huggingface dataset:
appa505 - Page 1
Forum section: electronics / general

author: jakubxpl
author_rank: Newbie
timestamp: December 30, 2012, 08:37:24 pm
content: hi i would like ask about multimeter opinion I'm interested exactly APPA505http://www.appatech.com/appa_product_home.php?pdid=2009091810044515198&&kindid=2005081003113623241and looks the samehttp://www.idealindustries.com/prodDetail.do?prodId=490-series-digital-multimeters&div=1&l1=multimetershttp://www.conrad-uk.com/ce/en/product/124705/br---VOLTCRAFTbr---VC950TRMS-digital-multimeter-VC900-Series-10000100000-Counts-CAT-IV-600V/SHOP_AREA_17622&promotionareaSearchDetail=005I spent a lot of time to find the triplets and I think that's not all some models APPA looks like BENNINGthank you greetingssorry for my english
The real James Bond - Serbian Dusko Popov (History channel documentary) - Page 1
Forum section: electronics / general

author: Slobodan
author_rank: Regular Contributor
timestamp: December 28, 2012, 09:40:25 am
content: He was critical for the success of the "D day".He robbed the nazis of thousands of dollars in cash.He supplied vital intelligence to the allies about Hitler's flying bombs.He almost succeeded in preventing Japanese attack on Pearl Harbor.Dusko Popovhttps://en.wikipedia.org/wiki/Du%C5%A1an_Popov

author: tom66
author_rank: Super Contributor
timestamp: December 28, 2012, 12:02:07 pm
content: History channel showing actual history?Say it isn't true!

author: MikeK
author_rank: Super Contributor
timestamp: December 28, 2012, 03:46:50 pm
content: One of my favorite badasses, Count Rochefoucauld:http://www.badassoftheweek.com/index.cgi?id=390735217925
Ordering at Soanar Plus  - Page 1
Forum section: electronics / general

author: GK
author_rank: Super Contributor
timestamp: December 26, 2012, 01:36:10 pm
content: I just went to the Sonar Plus website to order some stuff for personal use. Now, to order from them, one apparently needs to register for a trade account first, providing both a business name and an ABN. You can't even look up prices anymore without being registered and logging onI guess they would now prefer me, as an individual, to purchase my bits for personal use from their Jaycar wing and pay their inflated prices instead; and without the complementary jellybeans.A$$holes!If they want to play that way I think I will now make a deliberate effort NOT to purchase work related items from them anymore, if the items can be readily sourced from elsewhere.

author: GK
author_rank: Super Contributor
timestamp: December 28, 2012, 07:11:53 am
content: What??So nobody else buys hobby bits from Soanar Plus and are now pissed that they have to submit an ABN??Wasn't the "trade account" thing what Electus Distribution was for?

author: johnboxall
author_rank: Unknown
timestamp: December 28, 2012, 07:42:27 am
content: Quote from: GK on December 26, 2012, 01:36:10 pmYes, that's what Jaycar is for. Shop around.

author: GK
author_rank: Super Contributor
timestamp: December 28, 2012, 01:50:36 pm
content: Well, only until very recently, it would seem. I was always under the assumption that Soanar, being mail order only, offered the lower prices to the public due to the lower operating overheads that must come with not having to operate and staff a few dozen stores over the country.
Guitar Amplifier Popping Noise - Page 1
Forum section: electronics / general

author: dfox416
author_rank: Contributor
timestamp: December 28, 2012, 06:53:29 am
content: Hi,I have a 1987 Roland JC120 solid state guitar amplifier that I have been working on for a while but I have not been able to fix my problem. When the amp is on, it makes intermittent popping sounds. It seems to take a couple minutes before the popping sounds start and turning up the volume of the amplifier does not affect the volume of the popping. The first thing I tried was replacing the filter capacitors in the power supply section (this didn't work but it was probably a good thing to do anyways given the age of the amp). One time when I had the amplifier circuit out of the cabinet, I put a fan behind it and the popping noise stopped. I'm not sure how to interpret this. I have noticed that there is a small portion of the circuit that gets very hot when it is turned on (so hot that I cannot touch it for more than a second or two), but I don't know if this is normal or not. The hot part involves 2 transistors, a 2SB647-C and a 2SB667-C, as well as a few resistors, but again, I don't know if this is completely normal or not.The schematic can be seen here:http://elektrotanya.com/PREVIEWS/45612216/23432455/hangszer/roland/roland_jc-120-82.pdf_1.pngDoes anyone have any ideas what could be wrong with this amp? Any help would be greatly appreciated. Thank you!

author: amyk
author_rank: Super Contributor
timestamp: December 28, 2012, 10:38:30 am
content: Are the hot transistors Q7 and Q8? Those form a push-pull amplifier. I suggest checking the +15V supply to make sure that it is not too high, and the caps and resistors around there to see if any are shorts.

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 28, 2012, 11:00:36 am
content: Does it stop when you plug something into the "MAIN IN"? If so, check the electrolytes between the volume control and the MAIN IN.If it does not stop the problem must be to the right of the MAIN IN, check the electrolytes there (C16, C24...)
DIY SMD Stencils  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 30, 2012, 12:50:13 pm
content: hard work to make very fine pitch stencilshttp://pmonta.com/blog/2012/12/25/smt-stencil-cutting/

author: Tuomas
author_rank: Contributor
timestamp: December 30, 2012, 05:57:49 pm
content: That is quite interesting. Wasn't even aware there were machines like that.Almost tempted to buy one. Amazon.de has one seller selling that thing. 320eur shipped to Finland.
Privacy And The Car of The Future  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 28, 2012, 12:04:05 am
content: To date, remote vehicle communications have provided little in the way of privacy. Much information and misinformation has been spread on what the system is and can do, especially within the information security community. The recent field trial in the US of a connected vehicle infrastructure raises the level of concern amongst all who are aware of existing privacy issues.In this talk I will examine a current system high level design for North American vehicles, conforming to IEEE and SAE standards and used in a recent road test in Ann Arbor, Michigan, USA. I will consider privacy concerns for each portion of the system, identifying how they may be addressed by current approaches or otherwise considered solutions. I conclude with a discussion of the strategic value in engagement between the privacy community and automotive industry during development efforts and the potential community role in raising privacy as a competitive advantage.
Intel Thunderbolt - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: December 26, 2012, 12:21:58 am
content: Reading more about the Intel thunderbolt technology, and have followed the development of it since it was called light pipe last year. This seems like it could be the holy grail of cables. One cable that can do data, 10 Watts of power and carry video, or anything else if needed. I can't imagine the day when a pc could have one kind of port where anything you have works in that port, without adapter, a and b style cables, cat 5 or cat 6, dvi or HDMI. Eventually intel is considering pushing it to the consumer market for things like tv and player interconnect, so it could be the one cable to rule them all.The main downside I see is cost, but that will decrease just like all tech. I also want to see what methods of interface will be available for lower end engineers that don't do 10,000 quantity parts orders.Promise is shipping an external drive soon that uses the connection, 750MB/sec, that is megabyte not bits, basically a blank 74 minute cd every second, using an SSD drive or 480MB/sec with platter based drives. Dual channels can also be used for 1.5GB/sec. After transferring several hundred GB this week to a friends external drive, I welcome its arrival.some of the intel highlights:https://thunderbolttechnology.net/QuoteWondering what others think ?http://www.promise.com/storage/raid_series.aspx?region=en-US&m=574&rsn1=40&rsn3=62Quote

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 26, 2012, 01:06:24 am
content: active cables in the current generation is pretty stupid imho.

author: NiHaoMike
author_rank: Super Contributor
timestamp: December 26, 2012, 01:34:47 am
content: What's missing are PCIe cards to add Thunderbolt to an existing PC. Not very many are willing to replace a recent PC just to get Thunderbolt, even if Thunderbolt devices become cheaper. Contrast that with interfaces like USB 3 and (e)SATA and while they might not be quite as fast, both upgrade cards and devices are cheap and commonly available.

author: McMonster
author_rank: Frequent Contributor
timestamp: December 26, 2012, 02:52:31 am
content: I think Thunderbolt had very bad start. USB 3 is there and it's everywhere. Cheap devices are common. Outside Apple world it is very likely the standard will disappear.

author: amyk
author_rank: Super Contributor
timestamp: December 26, 2012, 12:40:38 pm
content: Quote from: McMonster on December 26, 2012, 02:52:31 amIt also looks like Thunderbolt is proprietary and the specs are not freely available. I agree that USB3 is going to dominate, just like USB2 vs IEEE1394; while the latter was technically superior in many ways it was not as open as USB, and so manufacturers went with the former.
“Neuristor”: Memristors used to create a neuron-like behavior - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: December 25, 2012, 10:09:02 am
content: (From arstechnica)Computing hardware is composed of a series of binary switches; they're either on or off. The other piece of computational hardware we're familiar with, the brain, doesn't work anything like that. Rather than being on or off, individual neurons exhibit brief spikes of activity, and encode information in the pattern and timing of these spikes. The differences between the two have made it difficult to model neurons using computer hardware. In fact, the recent, successful generation of a flexible neural system required that each neuron be modeled separately in software in order to get the sort of spiking behavior real neurons display.But researchers may have figured out a way to create a chip that spikes. The people at HP labs who have been working on memristors have figured out a combination of memristors and capacitors that can create a spiking output pattern. Although these spikes appear to be more regular than the ones produced by actual neurons, it might be possible to create versions that are a bit more variable than this one. And, more significantly, it should be possible to fabricate them in large numbers, possibly right on a silicon chip.(...)read the rest of the article herehttp://arstechnica.com/science/2012/12/neuristor-memristors-used-to-create-a-neuron-like-behavior/
Mustek 1200 ED plus - Page 1
Forum section: electronics / general

author: Rick
author_rank: Frequent Contributor
timestamp: December 24, 2012, 08:47:18 pm
content: Hi,I have a Mustek 1200 ED plus bought in the year 2000, that I did not use for a few years since I bought my Samsung multifunction printer in 2008 which includes also a scanner.Recently I wanted to connect it to my PC to test it.It is not detected by the PC as a new device, hence I cannot install the driver. I measured the plug pack output voltage, it is ok.Does anybody have a service manual for this unit?I sent an email to Mustek but no answer yet, since it is Christmas.The board connected to the plug pack has several electrolytic capacitors, those have at least double their rated capacitance values, but I suspect they must be in parallel with each other somehow. Their ESR seem good. I checked the diodes in situ, but they seem to let pass some current in the reverse direction, that's why I want to see if there is anything connected in parallel to those.The output of the 7805 regulator is 5V. What else can that be? I changed the PC-Scanner connector but that did not help.How can a scanner which sit a few years on shelves go bad? I thought about capacitors or may be something happened the last time I used it...

author: houdini
author_rank: Regular Contributor
timestamp: December 25, 2012, 03:49:11 am
content: why does that prevent you from installing drivers?http://www.mustek.com.tw/Download/driv_scanr/europe/1200edplus.htmlaren't those the drivers?

author: Rick
author_rank: Frequent Contributor
timestamp: December 25, 2012, 11:58:50 am
content: May be I can install I don't know but if the computer does not detect any device connected to the printer port, it is not useful.

author: bitwelder
author_rank: Super Contributor
timestamp: December 25, 2012, 02:00:47 pm
content: If you have possibility to run a Linux machine (even if run from a LiveCD), you can just plug the scanner and have a look at bottom of output for 'dmesg' command, it should show if it has detected a new USB device (i.e. if it's alive). No drivers needed.

author: Rick
author_rank: Frequent Contributor
timestamp: December 25, 2012, 03:44:10 pm
content: Quote from: bitwelder on December 25, 2012, 02:00:47 pmOk. I shall run linux from the Linux liveCD I use for other purposes on a daily basis.Thank you.

author: rollatorwieltje
author_rank: Unknown
timestamp: December 25, 2012, 03:51:07 pm
content: Quote from: Rick on December 25, 2012, 11:58:50 amIs it supposed to be autodected? The parallel port is quite a dumb port, the only thing you probably need to do is install the driver and point it to LPT1.Also make sure your printer port is actually enabled in the BIOS and it is set to bidirectional mode.

author: Rick
author_rank: Frequent Contributor
timestamp: December 25, 2012, 04:54:12 pm
content: Quote from: rollatorwieltje on December 25, 2012, 03:51:07 pmRight it is on the parallel port and the device works actually as you said...Thanks a lot.I was going to screw up a working device.I have been too much influenced recently by Dave's repair videos;)
MOVs caught on fire (from DP) - Page 1
Forum section: electronics / general

author: AlphZeta
author_rank: Regular Contributor
timestamp: December 24, 2012, 06:52:23 pm
content: I just read this from DP. I am gonna test mine to see.....http://dangerousprototypes.com/forum/viewtopic.php?f=2&t=4915#p47583http://youtu.be/j53qtYc5ZeE?t=3m19s

author: saturation
author_rank: Super Contributor
timestamp: December 24, 2012, 09:14:37 pm
content: https://www.eevblog.com/forum/suggestions/surge-protectors-scams-and-saints/15/You can't really test a MOV based protector unless you destroy it, since it works like a fuse, once fully used its dead.

author: AlphZeta
author_rank: Regular Contributor
timestamp: December 25, 2012, 01:06:47 am
content: QuoteOf course, I should have chosen my words better... Anyway, I have more than 10 cheap power strips and I was thinking of sacrifice a couple to see if they indeed catch on fire when the voltage remains high for a prolonged period of time. Of course I don't have a variac on hand right now so I couldn't really give it a go. But it does look pretty scary when these MOVs caught on fire! I guess I would think twice before I buy a new power strip.
Uncle Lo Rare Earth Monopoly - No So Much - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: December 24, 2012, 11:43:54 pm
content: Greetings EEVBees:--El Reg article about the overblown China monoply.http://www.theregister.co.uk/2012/12/23/rare_earth_non_monopoly/"Don't give up the ship"Captain James Lawrence USN 1781 - 1813Best RegardsClear Ether
Seasons Greetings - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: December 23, 2012, 01:51:00 pm
content: Season greeting to one and all and have a happy new year.

author: saturation
author_rank: Super Contributor
timestamp: December 24, 2012, 04:46:15 pm
content: ... to one and all ...

author: AndyC_772
author_rank: Super Contributor
timestamp: December 24, 2012, 06:09:32 pm
content: Merry Christmas everyoneHave a little xmas project from me - you'll need a PIC18F25K22, a 7805 regulator, a handful of LEDs and resistors, and a piece of stripboard. Program it to twinkle in whatever pattern you like!

author: M0BSW
author_rank: Frequent Contributor
timestamp: December 24, 2012, 08:14:14 pm
content: Merry Christmas Everyone
Inverter Board Assembly - SMD, THT, Testing & Lacquer - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: December 24, 2012, 04:04:45 pm
content: Greetings EEVBees:--Nice video of board assembly at SMA in Germany."All business sagacity reduces itself in the last analysis to judicious use of sabotage."Thorstein Bunde Veblen 1857 - 1929Best RegardsClear Ether
Where to buy  - Page 1
Forum section: electronics / general

author: Jane
author_rank: Frequent Contributor
timestamp: December 24, 2012, 03:02:47 pm
content: Can anyone advice where I can buy one of these elastomer materials?First elastomer that consists of a fine pitch matrix (0.1mm x 0.1mm) of gold plated wires (40 micron diameter), which areembedded at a 63-degree angle in a soft insulating sheet of silicone rubber.Another elastomer consists of an ultra fine pitch matrix (0.05mm x 0.05mm) of gold plated wires (20 microndiameter), which are also embedded at a 63-degree angle in a soft insulating sheet of silicone rubber.I need them in sizes of 40 x 40mm or so.Thank you for help
'Tis the season and all that.. Christmas light question. - Page 1
Forum section: electronics / general

author: aargee
author_rank: Frequent Contributor
timestamp: December 24, 2012, 01:55:40 am
content: I've got some RGB Christmas lights. These are bauble types with each LED cycling through RGB. The lights are powered by 24V AC through a transformer.The lights have suffered some corrosion, but on dismantling them to do a bit of fixing (because they are aesthetically pleasing to SWMBO), I've found a 4.7uF/50V polarised electrolytic cap stuck across the incoming 24VAC (yes it is AC). The LEDS are constructed in a few series strings then in parallel with the AC (and cap). What function would this capacitor have? Is it there for when the LEDs are all conducting as some sort of filtering?I know the Chinese manufacturers wouldn't throw a cap in there if they could get away with it.- Rob.

author: David_AVD
author_rank: Super Contributor
timestamp: December 24, 2012, 02:09:57 am
content: Are you basing the 24V AC on the fact they come with a 24V AC transformer?Check the wire between the transformer and the first light. It's very common to have a diode bridge contained in a small lump in that section.

author: aargee
author_rank: Frequent Contributor
timestamp: December 24, 2012, 02:13:49 am
content: I'll have a look tonight when I get home but I'm pretty sure there are no other components apart from the LEDs and capacitor.Such a suitable task for Christmas eve- Rob.

author: Psi
author_rank: Super Contributor
timestamp: December 24, 2012, 02:15:17 am
content: Yeah.Either it's got a diode/diodes somewhere or it was intended to be run on DC.It's pretty common for china to ship stuff that's wired wrong.As long as it actually works they don't care about much else.They probably ran out of DC powerpacks.So after plugged in an AC one and seeing the lights work they started shipping them that way.

author: aargee
author_rank: Frequent Contributor
timestamp: December 24, 2012, 08:32:33 am
content: Yes, you were right. There are two diodes built into the connector, the cap is near the first LED. So it's half wave rectified DC, no wonder corrosion was such a problem.

author: amyk
author_rank: Super Contributor
timestamp: December 24, 2012, 09:30:22 am
content: Quote from: Psi on December 24, 2012, 02:15:17 am...and sometimes theydon't even check that they'll work safely for any length of time.
RSS feed hasn't updated in a week. - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 22, 2012, 09:00:25 pm
content: I've not been getting episodes.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 24, 2012, 06:21:58 am
content: Thanks to everyone who replied.QuoteI understand xml feed is to be dropped. My podcatcher failed to relay the last XML post since it only responds to media updates of new files. The last post had no media hence I had no clue.I can't do bit torrent here. I cant sit around and nurse a PC while it downloads a file at a snails pace. Or youtube either. I barely get 360p youtube without choppy-ness. Even when I try and pause and "read-ahead" the player stops pulling data down the pipe.My DSL router is too far away from the DSLAM. What I do is rely on a unix server snorting everything slowly while I'm at work. So BT or YT is hardly an option.The file server bandwidth hit is high for a reason Dave. It's convenient and it's miles better than youtube. There is more to life than youtube views, mate.
Orienting non-polarized caps - Page 1
Forum section: electronics / general

author: bitwelder
author_rank: Super Contributor
timestamp: December 23, 2012, 10:27:23 pm
content: This is something that I haven't thought about it before: whether non-polarized capacitors have an orientation and so whether there is a difference in how to place them on a PCB.http://e2e.ti.com/blogs_/b/thesignal/archive/2012/12/10/pcb-layout-tricks-striped-capacitors-and-more.aspx(via a recent hackaday post)

author: free_electron
author_rank: Super Contributor
timestamp: December 24, 2012, 12:08:03 am
content: jep. that is very well known ( or it should be ) . Wound and stacked film caps have an indicator stripe to tell you where the 'shell' sits ( the outer plate ). that is the plate that should be connected to the low impedance point of the circuit.lets say you got R-C chain for an oscillator and one terminal is ground. The capacitor shell should be ground so the cap shoud be installed with the stripe connected to ground. this in effect acts as a shield.when i was doing ADSL this was important. you needed to know where the transmitter and receiver node was. swapping the electrodes of the cap sometimes gave as much as 15dB attenuation of the TX into the RX ( which is what you want)important stuff to know. The same is true for electrlytics. the metal can is tied to the negative pole through the electolyte... so it acts as a shield.
is photoinduction back ? - Page 1
Forum section: electronics / general

author: Simon
author_rank: Unknown
timestamp: December 23, 2012, 08:44:21 pm
content: I watched one of daves videos and after it came the suggestions from youtube for other videos, one being 300 KV on a TV, I thought he took all of his videos down, there are some transition effects and text overlays so I suspect someone else has reposted ? the account is now called photonvids.

author: PeterG
author_rank: Frequent Contributor
timestamp: December 23, 2012, 08:48:23 pm
content: Photonicinduction is now photonvids. He changed the name about the time he got married.Regards

author: Simon
author_rank: Unknown
timestamp: December 23, 2012, 09:14:19 pm
content: Ah right, I thought he'd given it up, thing is "photoinduction" keeps appearing on the vodeos

author: EEVblog
author_rank: Unknown
timestamp: December 23, 2012, 09:46:10 pm
content: Quote from: Simon on December 23, 2012, 09:14:19 pmProbably because he's still capitalising on that name, because that's who he's known as PhotonicInduction.He (foolishly I think) shut down his old channel completely, so maybe could not get the old channel name back.Dave.

author: PeterG
author_rank: Frequent Contributor
timestamp: December 23, 2012, 09:49:31 pm
content: His older videos show "Photonicinduction" the intro. He may have changed it to "Photoinduction" on his newer videos.RegardsEdit: yeah, what Dave said .

author: EEVblog
author_rank: Unknown
timestamp: December 23, 2012, 09:59:22 pm
content: Quote from: PeterG on December 23, 2012, 09:49:31 pmI haven't looked!That's strange. Maybe it's the new guy who's editing the videos for him spelled it wrong?He was certainly know as PhotonicInduction, and his new channel name is PhotonVids, so "PhotoInduction" doesn't make sense...Dave.

author: Simon
author_rank: Unknown
timestamp: December 23, 2012, 10:05:17 pm
content: Maybe is trying to maintain some continuity. My first thought was that someone was ripping his videos off with some added editing.

author: orbiter
author_rank: Frequent Contributor
timestamp: December 23, 2012, 10:40:26 pm
content: I believe Photon's vids were being copied all over You Tube land which understandably he didn't want, or like. So between that and folk moaning about safety all the time it was getting too much.. So he gave-up on You Tube for a good while then decided to come back with the renamed channel.I think renaming the channel was just easier for him to do. Initially he was going to give up on You Tube all together, but returned with the new name and the intention of starting again on a much smaller scale.. However after a billion requests or so he started to re-upload most of the older content, this all needed to be edited first though to help protect the material, and include some safety clauses here and there.A You Tube mate called AintBigAintClever started off all the editing of Photonvids channel for him, and created the new start/end sequences etc.
Thoughts on this PS design? - Looks interesting! - Page 1
Forum section: electronics / general

author: george graves
author_rank: Super Contributor
timestamp: December 22, 2012, 09:46:44 pm
content: More info here:http://qwertyboydesign.wordpress.com/Github:https://github.com/qwertyboy

author: MikeK
author_rank: Super Contributor
timestamp: December 23, 2012, 12:23:35 am
content: Two comments from this amateur: Isn't that MCU kinda overkill? And why the OLED?...A power supply gets used a lot and OLEDs don't have the best lifetime.Other than that, isn't it your basic PWM controlled supply?

author: westfw
author_rank: Super Contributor
timestamp: December 23, 2012, 07:20:56 am
content: It's supposed to be based on Dave's design...QuoteAren't they all these days? It's a $3 part instead of the $2 ATmega328 that was originally used...And it operates at full speed at 3.3V, and had dual SPI ports (according to the website.)I don't particularly get the OLED. To me, the purpose of a homemade power supply is to be significantly cheaper than a bought supply, or to provide some unique capability. a "Fancy display" is irrelevant.

author: krish2487
author_rank: Frequent Contributor
timestamp: December 23, 2012, 08:31:26 am
content: I would prefer a larger display for the PSU rather than a OLED one.As far as the design goes, all the power supply designs share the same fundamental design as dave explained in the PSU deisgn series of videos..I think it was the first one or may be the second one..a current sense section, a voltage regulation section and a series pass regulator.I d think it would be a much more utilitarian to have a larger display which is easily visible from a couple of feet away.(IMHO 1" 7 segment displays would be perfect)But, each to his own.It is a good implementation of the PSU anyway.

author: Bored@Work
author_rank: Super Contributor
timestamp: December 23, 2012, 10:57:36 am
content: Quote from: krish2487 on December 23, 2012, 08:31:26 amOnly that the designer of this one even claims he is using Dave's design:Quote

author: krish2487
author_rank: Frequent Contributor
timestamp: December 23, 2012, 02:46:10 pm
content: True, he did..and thats actually very courteous of him.
GoPro Hero2 forsale on ebay - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 22, 2012, 09:51:18 am
content: http://www.ebay.com/itm/GoPro-Camera-HD-HERO2-Edition-Brand-New-/360491546271?pt=Camcorders_Professional_Video_Cameras&hash=item53eef8769fThe price.

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 22, 2012, 03:05:42 pm
content: Not to mention the extra warranty for just $299.99

author: gszo123
author_rank: Contributor
timestamp: December 22, 2012, 04:56:44 pm
content: Quote from: PA0PBZ on December 22, 2012, 03:05:42 pmFrom ebay: "Quality products at affordable prices."Now that's a deal!

author: Skimask
author_rank: Super Contributor
timestamp: December 23, 2012, 12:55:51 am
content: Free Shipping
looking for Bench meter Manula - Page 1
Forum section: electronics / general

author: M0BSW
author_rank: Frequent Contributor
timestamp: December 22, 2012, 12:29:44 pm
content: I have a black*Star Bench meter which were made locally to me, and do you think I can find one, I like Black*star test equipment, but finding this manual or a download is becoming impossible.

author: Bored@Work
author_rank: Super Contributor
timestamp: December 22, 2012, 01:57:49 pm
content: Try your luck with TTi, they bought black star.

author: M0BSW
author_rank: Frequent Contributor
timestamp: December 22, 2012, 02:50:57 pm
content: Quote from: Bored@Work on December 22, 2012, 01:57:49 pmI will thank you
What would you like to see/buy/know in SEG Shenzhen? - Page 1
Forum section: electronics / general

author: mianchen
author_rank: Regular Contributor
timestamp: December 21, 2012, 05:55:01 pm
content: Every time when I'm ordering parts from Farnell/Rapid etc I wish I was living near the SEG market in Shenzhen, so I can go and pick whatever I want. Now we ARE going to China next month, I can't think of what I should do when I am actually there...I've been there 7 years ago when I wasn't into electronic much, it seemed a bit too overwhelming to me

author: jeroen74
author_rank: Frequent Contributor
timestamp: December 21, 2012, 10:15:16 pm
content: What I read about that market is that you really have to build good relations first with the people there if you want good prices or any business at all. As an outsider you will be overcharged massively. And components go by the reel only. And hoping you get new components instead of pulled and/or fakes and/or cheap knockoffs.

author: johnboxall
author_rank: Unknown
timestamp: December 21, 2012, 10:22:16 pm
content: Do you know anyone over there? Planning and good connections (guanxi) FTW.Ian Lesnet made a nice video of his trip in China:http://dangerousprototypes.com/2012/04/19/video-hua-qiang-bei-market-in-shenzhen-china/

author: baoshi
author_rank: Regular Contributor
timestamp: December 22, 2012, 12:41:45 am
content: For components, some of my experiences for outsiders:1. For branded chips buy only highly specific ones, like mcu, ram. Avoid buying generic chip like opamp or regulator. They could be remarked or refurbished. Never believe factory package. They have their own refurbish machine and repackaging line.2. If you need small quantity of components ask price for whole reel first, then tell them you want sample "yang-pin". The price shall rise to about 1.6-1.8x of the whole sale price. Most of the times it is still a lot cheaper than digikey.3. Make sure to find shops having existing stock in the counter. Never let the runner "fetch from office". All gimmicks start from there.4. Happy shopping
Bad Santa steals cash from safe - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: December 24, 2012, 07:30:45 am
content: Too funny!By all means leave out beer and cookies, but to be safe, don't leave your wallets in site.http://www.smh.com.au/nsw/bad-santa-steals-cash-from-safe-20121224-2bul8.html

author: Razor512
author_rank: Regular Contributor
timestamp: December 24, 2012, 07:47:36 am
content: Someone should make a RFID enabled safe where if it detects the RFID tag, it shuts off a relay connecting the safe to a 240V line, of if they don't like using the mains, they can have it act as a stun gun.

author: McMonster
author_rank: Frequent Contributor
timestamp: December 24, 2012, 01:37:06 pm
content: Looks like in Oz everything works the other way around, people walking with their heads pointing down, Santas stealing instead of giving presents.

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 25, 2012, 01:35:37 am
content: Quote from: Sionyn on December 24, 2012, 03:30:24 pm10/10
Quantum Levitation   - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 20, 2012, 11:44:25 pm
content: It is a result of the Meissner effect in superconductors enjoy

author: G7PSK
author_rank: Super Contributor
timestamp: December 21, 2012, 12:49:11 pm
content: Now I know how flying saucers work.https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif
NASA on tin whiskers and Toyota - Page 1
Forum section: electronics / general

author: JonnyBoats
author_rank: Regular Contributor
timestamp: December 20, 2012, 05:36:49 pm
content: NASA study documents tin whisker problems with Toyota accelerators.http://www.edn.com/electronics-blogs/readers--choice-2012--jokes-about-engineers--iphone-5--30-years-of-dsps--more/4368865/Toyota-accelerations-revisited-hanging-by-a-tin-whisker?cid=EDNToday

author: Mechatrommer
author_rank: Super Contributor
timestamp: December 20, 2012, 06:13:19 pm
content: damned ROHS! auto giant got blamed for this. i hope i'll remember this thread for 10-20 years to come, when my toyota going whacko, then i'll know where to put lots of lead.

author: JonnyBoats
author_rank: Regular Contributor
timestamp: December 20, 2012, 06:21:50 pm
content: Looks like the Myan's were really smart people! How did they know so many centuries ago that this would be the day that a tin whisker would short out the computer that runs the world?

author: ftransform
author_rank: Frequent Contributor
timestamp: December 20, 2012, 08:24:14 pm
content: oh fuck. Imagine the soviet dead-hand system gets a tin whisker problem and launches nuclear missiles???

author: G7PSK
author_rank: Super Contributor
timestamp: December 20, 2012, 09:14:25 pm
content: What is more hazardous to health lead in solder or Cars running amok, apparently the British army is to remove lead from bullets as it is harmful to the health of soldiers.
MRI headphone power supply - Page 1
Forum section: electronics / general

author: AndreasF
author_rank: Frequent Contributor
timestamp: December 19, 2012, 08:36:20 am
content: Yesterday's story on TheDailyWTF featured a story not related to their usual topic (coding), and it's interesting for people her, I think. A little teaser:Quotehttp://thedailywtf.com/Articles/Power-Supply.aspx

author: Thor-Arne
author_rank: Unknown
timestamp: December 19, 2012, 11:04:00 pm
content: ROFL, this is ridiculous.

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 20, 2012, 12:10:12 am
content: They were probably going to do a good job but ran out of time/money and fudged it in. But still, rofl.

author: ftransform
author_rank: Frequent Contributor
timestamp: December 20, 2012, 12:22:43 pm
content: No wonder health care is so expensive.....

author: Fraser
author_rank: Super Contributor
timestamp: December 20, 2012, 03:23:29 pm
content: Hospitals are in a very difficult position.....I see no end of component and equipment specifications that state they are not to be used for Medical equipment or systems. I believe this relates to the public liability issues surrounding medical equipment. Medical equipment is supposed to be built to high standards using high quality components. If a Hospital were to fit a commercial 'non medical standard' power supply to a piece of their equipment they would likely have issues with both their insurance and the risk of injuring a patient with associated law suite. They just can't win...they have to go back to the manufacturer for spare parts and repair.In this case the equipment is acoustic, non-mission critical and safe to fail. That doesn't stop the medical equipment manufacturer ripping off the hospitals who are just trying to do the right thing. This MRI company should ashamed of themselves for making such a poor power supply. They don't seem to have considered the fact that commercial laptop type power supplies are designed to operate in free air for cooling, not sandwiched together in a closed box. What a crap unit !The only good news is that mission critical systems are built to very high standards and some that I have met will even warn of the impending service date and demand to be calibrated. All good ideas if you are hooked up to a machine that is supporting your health. I bought a spectrum analyser from Toshiba UK that was used for just one test on an MRI machine. It was used to align a coil assembly and has less than 100 hpurs use on it ! .That's a US$35000 instrument just to set up one small part of an MRI machine.... MRI support can be expensive.Fraser

author: Unknown
author_rank: Unknown
timestamp: December 20, 2012, 03:35:06 pm
content: can't believe it.... what a waste of money...
Jack Gansele highlights uCurrent! - Page 1
Forum section: electronics / general

author: PuterGeek
author_rank: Regular Contributor
timestamp: December 20, 2012, 02:47:58 am
content: Congratulations Dave!The uCurrent is highlighted at number 3 in Jack Gansele's "Top ten milestones in embedded 2012"!http://www.embedded.com/electrical-engineer-community/industry-blog/4403699/8/Ten-most-important-milestones-in-embedded-systems-2012Unfortunately he links to your alternatezones web page.Hey Dave, maybe you can replace that page with a redirect to your new page.I used to know how to do that but the brain cell expired due to lack of use. I'm sure Google can help you out.I did post the new website in a comment. Hopefully they will update the article.I hope you get some sales out of the mention!

author: EEVblog
author_rank: Unknown
timestamp: December 20, 2012, 07:17:26 am
content: Nice find, cool!ThanksDave.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 20, 2012, 08:47:50 am
content: "....and a new-new and very innovative product I'm not allowed to talk about yet. The bottom line is that designers of low-power systems now have tools that operate in the power/code domains."I wonder if this is something like a device I started work on a few years ago and then got distracted :A wide-range, integrating current measuring device, that could produce accurate avarage current draw figures for devices that bounce rapidly between different current-draw states (sleep modes). Anyone who's ever designed low-power battery powered MCU stuff will know how useful this could be....
Odroid - anyone got an opinion on these? - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: December 19, 2012, 07:55:02 am
content: /.

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 19, 2012, 09:45:51 am
content: eMMC is basically just NAND + a controller in a single for simple interfacing and management.In the case of this specific device, they do not provide on board storage, but they offer the next best thing; a header for attaching what would be used as on board storage in a marketed device so it would be interfaced the same way ect.They also provide a microSD slot.Pros of this device, the chip is a beast in its class, very good performance, though, depending on what you're emulating it may/may not be sufficient.Cons: This is a pretty obvious software dev board, so don't really consider doing hardware dev. I'd need more info on what you're looking to do with it to give you more info.
Spectrum Analyzer input level specs questions - Page 1
Forum section: electronics / general

author: videobruce
author_rank: Frequent Contributor
timestamp: December 19, 2012, 04:31:10 pm
content: 1. The max input level spec, is this figure based on a combination of levels fromallsignals within the full bandwidth of the scope, or just the specific range that is currently displayed?2. Assuming it is within the specific span you set, if you are in the FM broadcast band with many stations at high levels, that number has to be exceeded isn't it?3. A tracking generator that has a option called "Power Sweep", where the output of the generator increases across the frequency range under test. Why and how is this used?

author: w2aew
author_rank: Super Contributor
timestamp: December 19, 2012, 06:18:52 pm
content: Quote from: videobruce on December 19, 2012, 04:31:10 pm1) There are two factors involved. One is max power allowed before damage. It is usually spec'd as TOTAL RF power, regardless of frequency range of the instrument. It is limited by the power handling capability of the input attenuator and first mixer. There is often another max power rating, which relates to the maximum power level allowable that will result in measurements meeting the specifications (like SFDR). This is usually limited by the range of the input attenuator and the performance of the first mixer.2) Depends on how you are coupling these signals in. If you are using an antenna, it's unlikely you'll overload the SA unless you have a very high gain antenna or are located very close to the transmitting site.3) Power sweeps are usually used to perform linearity tests on amplifiers, mixers, etc. to look at things like 1dB compression points, 3rd order intercept, etc.

author: videobruce
author_rank: Frequent Contributor
timestamp: December 20, 2012, 01:09:46 pm
content: Various specs from two different SA's for input level;"Max+20 dBm/50 Vdc""CW RF Power - RF attenuation = 30db - +20 dBm (100mW)""Max. Damage Level - +30 dBm""+30 dBm, 50Vdc""+30 dBm max input with 30 db attenuation, 50 Vdc"Can I assume those are for a single signal generated on the bench as opposed to a combination of many external signals when connected to an antenna?

author: videobruce
author_rank: Frequent Contributor
timestamp: December 20, 2012, 01:11:46 pm
content: How would a "Power Sweep" show on a scope? As a rising level across the display as the level is increased just as if you were increasing the output level?
soic clips - Page 1
Forum section: electronics / general

author: Simon
author_rank: Unknown
timestamp: December 18, 2012, 05:42:47 pm
content: how useful are soic clips ? last time i bought one it didn't even make contact with the chip, do they generally depend on perfect soldering of the package ?

author: free_electron
author_rank: Super Contributor
timestamp: December 18, 2012, 11:13:15 pm
content: a lot depends on the actual clip.only good ones are the blue pomona's or the black 3M's.
Awwwwww - Page 1
Forum section: electronics / general

author: SoftwareSamurai
author_rank: Regular Contributor
timestamp: December 17, 2012, 06:13:43 pm
content: Awwwww

author: SeanB
author_rank: Super Contributor
timestamp: December 17, 2012, 06:34:03 pm
content: He got nowt, at least she did not get his money......

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 17, 2012, 09:08:22 pm
content: He says '2348' and then punches '1235'... fail

author: PetrosA
author_rank: Frequent Contributor
timestamp: December 18, 2012, 03:21:52 pm
content: the PIN is the least of his worries - that card reader is the kind you insert - remove card from - can't eat your card. Epic fail
White Paper on Fake Battery Packs - Page 1
Forum section: electronics / general

author: bullet308
author_rank: Frequent Contributor
timestamp: December 17, 2012, 07:17:35 pm
content: Thought this might be of some interest to some. As I have been using more and more lithium batteries (mostly protected 4Ah 18650s and little premade USB charger boards) in things I have been working on of late, I found it interesting.The Dangers of AftermarketCounterfeit Battery PacksElectrochem Solutions, Inc.www.electrochemsolutions.com

author: RCMR
author_rank: Frequent Contributor
timestamp: December 17, 2012, 07:58:07 pm
content: Excess flux can cause short-circuits in a battery pack? News to me!
Odd connection between fathers of mass shooters  - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: December 17, 2012, 01:30:07 pm
content: I don't know if people are trying to say this is how to remove guns from the USA or if it was a threat to the fathers to not testify, or if it is a way to discredit both fathers testimony,"your child is a killer what kind of father would have a son like that and you want us to believe your testimony ?"Normally I don't put much thought into conspiracies but this is one hell of a coincident.QuoteRobert Holmes has decided to not testify in the hearing after the shooting occurred.

author: tom66
author_rank: Super Contributor
timestamp: December 17, 2012, 01:47:24 pm
content: Very shallow conspiracy if there is one.I can think of far easier ways than killing school children in mass shootings.Perhaps the correlation here is rich parents care more for their business/job than for their kids. Otherwise, they would have noticed certain characteristics as being warning signs.

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 17, 2012, 02:03:57 pm
content: his mother taught him to shoot, she was one those end of world nobbers who are preparing for the end world. thats why she had guns there family was one of those doomsday preppers who think the end of world is Nye.so not a farther link just another bunch of crackpotshttp://au.news.yahoo.com/world/a/-/world/15659440/gunmans-mother-was-doomsday-prepper/

author: ptricks
author_rank: Frequent Contributor
timestamp: December 17, 2012, 02:08:12 pm
content: Quote from: tom66 on December 17, 2012, 01:47:24 pmI agree . Weird things are starting to be found though, like in the last batman movie , in the scene at 1:58:45 on the left side on the map on the table, the words "sandy hook" are clearly visible and the only words on the map that can be read.
What is the difference between these two? - Page 1
Forum section: electronics / general

author: etstudent
author_rank: Regular Contributor
timestamp: December 16, 2012, 05:30:56 pm
content: What is the difference between a Electronics engineering technology degree and a straight Electronics engineer degree? Just a curious question because I have no idea what the diff. is. Thanks for any info.

author: AndyC_772
author_rank: Super Contributor
timestamp: December 16, 2012, 08:31:28 pm
content: That's a question you'd need to direct at the institution offering them. Ask what's on the syllabus for each. Chances are there will be a fair bit of overlap, assuming it's the same institution offering both, of course.

author: etstudent
author_rank: Regular Contributor
timestamp: December 16, 2012, 08:52:59 pm
content: Here is the full syllabus if it help you answer and understand?ASAST in Electrical Technology Credit DistributionSubject Area/Category CreditsI. General Education Requirements 30A. English Composition 6B. Humanities 6C. Social Sciences 6D. Natural Sciences and Mathematics 12College Algebra or Above(6)General Physics(6)II. Area of Study: Electrical Technology 21A. Direct Current Circuits 3B. Alternating Current Circuits 3C. Digital Electronics 3D. Electronic DevicesSolid State TheoryBasic ElectronicsSemiconductor Devices3E. AC/DC MachinesElectric Motors and MachinesMotors and GeneratorsMachinery and Transformers3F. Industrial Motor ControlsElectric Motor Controls3G. Electrical Motor ControlsIndustrial ElectronicsElectrical Power DistributionElectric Power GenerationElectronic InstrumentationMicroprocessorsElectric Codes and Blueprint ReadingProgrammable Logic Controllers3III. Free Electives 9A. Computer Concepts 3B. Free Electives 6Total 60

author: tom66
author_rank: Super Contributor
timestamp: December 16, 2012, 09:10:11 pm
content: Engineering Technology may be less orientated to engineering but instead technicians job, i.e. manufacturing, process control...

author: etstudent
author_rank: Regular Contributor
timestamp: December 16, 2012, 10:01:53 pm
content: Quote from: tom66 on December 16, 2012, 09:10:11 pmNow that sounds like a good explanation. I think you may be correct. Are there a decent amount of careers in this area or its Engineer or bust? Sorry for all the questions, just in a bit of quandary right now.