hybridfree/eevblog-posts huggingface dataset:
Manson NSP 3630 | Tenma 72-8345 -> Rev 1.4 fail - Page 1
Forum section: electronics / general

author: LEECH666
author_rank: Frequent Contributor
timestamp: December 09, 2012, 01:42:00 am
content: (Mikes video on the Tenma, just for reference).I actually wanted to shoot a followup video on a newer revision (Rev. 1.4, Mike seems to have Rev 1.1) of this Manson NSP 3630 PSU, where they improved a few things, but my unit already crapped itself just sitting on the bench, being powered for around 3 hours total mostly doing nothing (output disabled). I didn't hook up anything weird to it, unless 4 CPU fans that draw around 850mA DC at 12V are a weird load. Not so sure about that.Anyway the voltage display is broken now, displaying weird values, while actual outputted voltage is close to the set voltage. Doesn't really speak for the reliability of this PSU. Not that happy that I have to send it back.Some stuff they updated in Rev 1.4:- the blue back light is gone (or broken), LCD is just black with shiny white digits.- minimum current limit seems to be 150mA, couldn't get it to any lower current limit setting than that (maybe broken?, shouldn't this be adjustable down to 1mA?)- coarse/fine output adjust option was added to both the voltage rotary encoder and the current encoder. You can push the rotary encoder knob to select the digit you want to adjust. Steps are 1 mV, 10 mV, 100mV, 1V for the voltage and 1mA, 10mA, 100mA for the current.Pictures below show the display @12.00V. U691 what's that supposed to mean?Any why is the output voltage 100mV high all of a sudden?Probably not as catastrophic a fail as the Korad in Dave's video, but still not very impressive that it only lived 3 hours.Cheers,Florian

author: T4P
author_rank: Super Contributor
timestamp: December 09, 2012, 04:33:15 am
content: Looks like a OLED screen now

author: LEECH666
author_rank: Frequent Contributor
timestamp: December 09, 2012, 01:26:16 pm
content: Yeah I guess it could be an OLED display. The contrast is excellent and the digtis are very sharp and clear, viewing angle is pretty good.Guess I will send it back tomorrow and wait for the replacement ...Cheers,Florian
What Noises Would The EEVBLOG Lyrebird make ? - Page 1
Forum section: electronics / general

author: McMonster
author_rank: Frequent Contributor
timestamp: December 06, 2012, 08:40:55 pm
content: Easy to figure out. The sound of abused multimeters.

author: lewis
author_rank: Frequent Contributor
timestamp: December 06, 2012, 08:44:50 pm
content: Stray-yer, not Austria. Bloody dickheads....

author: SeanB
author_rank: Super Contributor
timestamp: December 06, 2012, 08:45:20 pm
content: One would be " Ducks guts"......... "Beauty!".........

author: Unknown
author_rank: Unknown
timestamp: December 06, 2012, 09:15:04 pm
content: Easier to spot than the rainforest mimic is the Australian Liar-Bird!

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 07, 2012, 04:28:54 am
content: It would sound like fast forwarded whistling.

author: Pak_Engineer
author_rank: Contributor
timestamp: December 07, 2012, 04:50:17 am
content: half a bee's dick.. take it apart take it apart..

author: Psi
author_rank: Super Contributor
timestamp: December 07, 2012, 05:01:03 am
content: It would be the beeps of numerous continuity range tests being carried out

author: ivan747
author_rank: Super Contributor
timestamp: December 07, 2012, 11:00:32 pm
content: "oztraaalia" "the right tongue angle" "davecad"

author: smugtronix
author_rank: Contributor
timestamp: December 08, 2012, 01:13:28 am
content: Brilliant!Lotsa porn in here!Fail!

author: McMonster
author_rank: Frequent Contributor
timestamp: December 08, 2012, 04:25:44 pm
content: Quote from: Pak_Engineer on December 07, 2012, 04:50:17 amI've just imagined Dave with a parrot on his arm and the parrot screaming "Take it apart! Take it apart!". That would be brilliant!

author: lewis
author_rank: Frequent Contributor
timestamp: December 08, 2012, 11:54:46 pm
content: WHYYYYYYYYYYYYYYYY!
help with buying another scope... - Page 1
Forum section: electronics / general

author: Aido4ever
author_rank: Contributor
timestamp: December 07, 2012, 03:28:17 am
content: I'm thinking to buy another scope. i would like it to be with logic analyzer and/or with the option to analyze serial comunication like the rigol ds2072...i found this scope on ebay, what do you think of it.http://www.ebay.com/itm/300828868384I'm no expert in electronic like you guys, it's my hobby...

author: Lightages
author_rank: Unknown
timestamp: December 07, 2012, 05:17:27 pm
content: Try reading this thread for a long discussion on this brand of scopes and firmware. Do a search for other comments on this forum on the different manufacturers of scopes and similar models. I have never seen a discussion on the mixed signal Hantek.
A good place to get old amplifier schematics? - Page 1
Forum section: electronics / general

author: toli
author_rank: Frequent Contributor
timestamp: August 15, 2010, 05:54:05 am
content: Hi Guys,Over the last couple of years I've needed the schematics of a few old amplifiers (70's-80's), and most of them are hard to find. I usually find some post by someone else who asked for it, and than if someone placed an email and said he has it I just email as well, so far it worked a couple of timesI know there are a few sites that have these but require an account which costs money. Since it's no a business of mine and I only need these for myself I would prefer something which is free. Are there any good web-sites for this?Thank you.

author: DJPhil
author_rank: Frequent Contributor
timestamp: August 15, 2010, 06:01:51 am
content: Yep.http://www.schematics-free.com/- I'd check here first. As the main page says, it's being ported over fromhttp://www.schematics.ca/, so if you can't find what you need check there too.http://www.ssguitar.com/index.php?board=4.0- SSGA has a subforum especially for schematics. There's a sticky listing different manufacturer's schematic sites.http://www.about-guitar-amps.com/free_guitar_amplifier_schematics.html- If all else fails. Requires registering, but they haven't pestered me at all so I'd consider them ok. Use a throwaway email if concerned.You can also ask the nice folks at SSGA for help, as they're not just solid state.Hope that helps.

author: lewis
author_rank: Frequent Contributor
timestamp: December 06, 2012, 12:06:11 pm
content: Old thread, but check outwww.schematicsunlimited.com. Everything's completely free

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 09, 2012, 01:38:18 am
content: Another site that has a large free collection ishttp://www.elektrotanya.comif you can deal with the part Hungarian site. The search and download is pretty straightforward. Watch the download page until the little waiting text changes to something like get the manual.

author: LEECH666
author_rank: Frequent Contributor
timestamp: December 09, 2012, 01:55:22 am
content: http://www.elektrotanya.com/has already been mentioned, the downloading is a bit weird, but otherwise it's a great collection of schematics that has helped me several times already. Make sure you don't use an adblocker on this page, or it may not let you download anything. See attached picture for the link you're looking for when downloading. (Get Manual).http://www.eserviceinfo.com/is pretty good too.The Audiokarma Forum also used to have a download section for some brand (I remember Pioneer mostly) amps.Don't know if it's still there. I think it was called "the vault" or smth. like that.//EDIT:http://www.akdatabase.com/Cheers,Florian
Who is the manfacture for Radio Shack enclosures? - Page 1
Forum section: electronics / general

author: george graves
author_rank: Super Contributor
timestamp: December 06, 2012, 11:00:09 pm
content: Any one know who the OEM is for radio shack's enclosures?I looked at Hammond's stuff - and it's not an exact match.Here's a pics for those that's not familiar with their cases.http://www.radioshack.com/product/index.jsp?productId=2062279

author: jhansonxi
author_rank: Newbie
timestamp: December 06, 2012, 11:41:04 pm
content: Probably some Asian OEM. Try:http://www.alibaba.com/trade/search?fsb=y&IndexArea=product_en&CatId=150512&SearchText=enclosure

author: free_electron
author_rank: Super Contributor
timestamp: December 06, 2012, 11:59:55 pm
content: try bud ...

author: FenderBender
author_rank: Super Contributor
timestamp: December 07, 2012, 02:17:14 am
content: I almost thought I remembered seeing made in USA on them...but I could be TOTALLY wrong.

author: MikeK
author_rank: Super Contributor
timestamp: December 07, 2012, 02:52:44 am
content: I have several of these. The only thing stamped on them is the Radio Shack part number. And the protoboards that Radio Shack carries don't fit any of their boxes.
From London to Aus in just 4 hours, soon? - Page 1
Forum section: electronics / general

author: Noize
author_rank: Regular Contributor
timestamp: December 05, 2012, 11:38:14 pm
content: http://www.reactionengines.co.uk/

author: Noize
author_rank: Regular Contributor
timestamp: December 06, 2012, 12:17:39 am
content: BBC Documentary about the 3 engineers who designed it.

author: EEVblog
author_rank: Unknown
timestamp: December 06, 2012, 01:24:20 am
content: Unfortunately, flying at Mach 5 is a lot more involved than just getting the engine to work.Dave.

author: vk6zgo
author_rank: Super Contributor
timestamp: December 06, 2012, 01:39:22 am
content: Yes,the clip gives me that "It's 1969 all over again" feeling!

author: notsob
author_rank: Frequent Contributor
timestamp: December 06, 2012, 03:59:53 am
content: If you ever saw any 'inside pics' of the concord, 1 rack type panel was almost flush with a vertical divider on take-off, and there was a 100mm gap in flight at max fuselage temp, so heat of the airframe going at high mach speeds, even in the upper atmosphere will need a lot of work.

author: SeanB
author_rank: Super Contributor
timestamp: December 06, 2012, 04:55:14 am
content: Most large aircraft have the avionics cooled, so that they only reach around 120C or so. The skin will normally be at 130c plus from frictional heating at near Mach 1. On fighters part of the cooling is provided by the LOX system evaporator, the rest by evaporating a water alcohol blend to cool bleed air. Pilot gets oxygen cooled air and the electronics gets the blend, the excess being vented. It does not burn.

author: Noize
author_rank: Regular Contributor
timestamp: December 06, 2012, 07:04:32 am
content: Quote from: EEVblog on December 06, 2012, 01:24:20 amI think you are totally wrong there, compared to developing that engine the rest will be relatively easy. The SR-71 Blackbird was flying at mach 3.5 with mid sixties tech.

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 06, 2012, 08:39:13 am
content: Bah, who cares about top speed if you still have to wait on the runway... It's all about the F-35B Lightning II now and it's fancy STOVL marketing gimmicks.

author: SeanB
author_rank: Super Contributor
timestamp: December 06, 2012, 03:58:08 pm
content: Most air travel is limited by turnaround time. That is why the planes are getting bigger.

author: Noize
author_rank: Regular Contributor
timestamp: December 06, 2012, 05:10:49 pm
content: Quote from: peter.mitchell on December 06, 2012, 08:39:13 amThat plane will need its own runway, how slender it is, it is probably landing at the minimum 300mph?

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 06, 2012, 05:16:53 pm
content: kewl dave and mike can do simulcast
Product photography - Page 1
Forum section: electronics / general

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 03, 2012, 11:13:55 am
content: Well, we've all see product photography, and awkward models, or where a company is definitely trying to throw some "sex sells" in there... I think this takes the cakehttp://www.tomshardware.com/picturestory/612-gift-guide-pc-hardware-recommendation.html; all of the models looks incredibly awkward, and the basis of the entire article is what made me stop reading this particular websites news when they started doing this a few years ago every holiday season.

author: Psi
author_rank: Super Contributor
timestamp: December 03, 2012, 11:20:54 am
content: Yeah, that's just stupid.That sort of advertising has no effect on the target market for PC components.And, as you say, its just looks awkward. So it makes people less likely to buy the product, not more likely.

author: r90s
author_rank: Regular Contributor
timestamp: December 03, 2012, 12:04:25 pm
content: I am afraid that this models sexy display made me give in and buy.https://www.conrad.de/medias/global/ce/1000_1999/1200/1280/1281/128118_AB_00_FB.EPS_1000.jpg#

author: Achilles
author_rank: Regular Contributor
timestamp: December 03, 2012, 12:56:02 pm
content: ...Hmm....a lot of *bling* *bling* on the models. They probably want to target the eastern-european market ;-).....@ r90s: who couldn't resist when looking at that adequate photo :-D

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 04, 2012, 08:00:13 am
content: This thread is now all about unnecessary women in product photography;http://www.ebay.com.au/itm/170527140283

author: amyk
author_rank: Super Contributor
timestamp: December 04, 2012, 08:35:27 am
content: Quote from: peter.mitchell on December 04, 2012, 08:00:13 amhttp://photo.163.com/powerjacktank/timelineNow we know what's with their quality: they spent all their money on hiring women to take pictures with their product instead of R&D.

author: Achilles
author_rank: Regular Contributor
timestamp: December 04, 2012, 08:45:54 am
content: ....there were products?!..... I even don't know if that marketing is working in ANY way. Maybe it's just to move the Google-Page-Rank up.

author: ptricks
author_rank: Frequent Contributor
timestamp: December 04, 2012, 01:53:05 pm
content: Quote from: Achilles on December 04, 2012, 08:45:54 amI looked at the girls and then noticed the products only because I was looking for the product in the ad.

author: peter.mitchell
author_rank: Super Contributor
timestamp: December 06, 2012, 06:01:18 am
content: I wanted to get the link in the OP, so i went bak to the site and the had a PART 2, what the heck!?http://www.tomshardware.com/picturestory/613-gift-guide-gadget-recommendation.html

author: pickle9000
author_rank: Super Contributor
timestamp: December 06, 2012, 06:18:54 am
content: Check this out.http://www.radioshackcatalogs.com/catalog_directory.html

author: ee851
author_rank: Regular Contributor
timestamp: December 06, 2012, 05:05:29 pm
content: I'm sold!
Mystery transistor - Page 1
Forum section: electronics / general

author: grumpydoc
author_rank: Super Contributor
timestamp: December 06, 2012, 01:03:12 pm
content: Can anyone ID these?The position in the circuit suggests a PNP bipolar transistor. ?emitter to +5V, base fed active low strobe via CMOS buffer, ?collector to a common anode 7 segment LED. Still to trace out all the details but I'm pretty certain that's how it's wired up.Manufacturer logo looks like ON Semi but I can't find anything in their product list to match.

author: JVR
author_rank: Regular Contributor
timestamp: December 06, 2012, 01:30:49 pm
content: Those are ONSemi, but you would need to drop a rep a mail to resolve the package number into a part number.Biggest drawback of miniaturization IMO, you stuggle your ass off to get a part number. Like LM1117-3.3's, they get marked as N05A

author: JVR
author_rank: Regular Contributor
timestamp: December 06, 2012, 01:34:17 pm
content: http://www.onsemi.com/pub_link/Collateral/NTD25P03L-D.PDFThere is your part.

author: grumpydoc
author_rank: Super Contributor
timestamp: December 06, 2012, 01:49:14 pm
content: QuoteBrilliant! thanks hugely.

author: grumpydoc
author_rank: Super Contributor
timestamp: December 06, 2012, 02:48:20 pm
content: Turned out the FETs were OK, nice clean signal at all drains.BUT, there were some DIP switches on the board. These were labelled "Switch DIP switches to on when used in an <X>". They were delivered in the off position and as I wasn't using the board in an <X> I naturally assumed they were correct.Nope! What they do is actually connect the FET drain to the display output for the digits that weren't working - flipped them to "on" and everything is hunky-dory.Rather miffed that I had to trace the whole thing out due to lack of documentation to discover this :-(
NASA-NOAA Satellite Reveals New Views of Earth at Night - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: December 06, 2012, 12:47:54 pm
content: Quotehttp://www.nasa.gov/mission_pages/NPP/news/earth-at-night.htmlhttp://eoimages2.gsfc.nasa.gov/images/imagerecords/79000/79800/dnb_united_states_lrg.jpg
"Do engineers go to parties" - Page 1
Forum section: electronics / general

author: rbola35618
author_rank: Frequent Contributor
timestamp: December 05, 2012, 05:09:29 am
content: Funny video "Do engineers go to parties"

author: free_electron
author_rank: Super Contributor
timestamp: December 05, 2012, 05:16:12 am
content: Not with a t-shirt tat says LabView on it. You'd be the mocking staple of the real engineers ....I throw several pool / bbq parties a year amongst my fellow engineers.

author: Psi
author_rank: Super Contributor
timestamp: December 05, 2012, 07:25:08 am
content: hehe, that's so true.Random person:So, what did you do in the weekend?How i prefer to respond:Nothing much.The truth:Added a synchronous motor rotary sparkgap to my tesla coil and added some overvoltage protection to the capacitor bank.Just try telling a non-tech person what you actually did in the weekend, it never ends well.You either confuse them or make them feel stupid.

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: December 05, 2012, 09:19:24 am
content: Quote from: Psi on December 05, 2012, 07:25:08 amLOLOLOLOLOLOLI hope one day to have all my engineers degrees one day but I am also extremely proud to be a red neck ...HERE is how we party....

author: Short Circuit
author_rank: Frequent Contributor
timestamp: December 05, 2012, 10:29:11 am
content: Pick different parties...Where noone tries to ask, nor would be able to hear your response.

author: Psi
author_rank: Super Contributor
timestamp: December 05, 2012, 10:47:30 am
content: Kinda depends if you're an introvert or extrovert.

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: December 05, 2012, 11:29:28 pm
content: Or my personal favorite and I love this band so much and have seem them many times ...

author: Kibi
author_rank: Unknown
timestamp: December 05, 2012, 11:43:58 pm
content: LOL, I haven't listened to Lamb of God in ages. I've finally got into Parkway Drive after much badgering.

author: Unknown
author_rank: Unknown
timestamp: December 06, 2012, 02:55:28 am
content: Quote from: Kibi on December 05, 2012, 11:43:58 pmhttps://www.youtube.com/embed/EIyixC9NsLI

author: T4P
author_rank: Super Contributor
timestamp: December 06, 2012, 08:49:07 am
content: My sort of parties

author: EEVblog
author_rank: Unknown
timestamp: December 06, 2012, 10:39:12 am
content: Ah, An Engineering Mind.Shame about what happened to that.He left NI and they wanted to keep ownership of the "brand".Even worse, he went onto into social media marketingDave.
'Everyone in US under virtual surveillance' - Page 1
Forum section: electronics / general

author: r90s
author_rank: Regular Contributor
timestamp: December 05, 2012, 08:11:56 am
content: Well Now! Ladies and Gents...https://rt.com/usa/news/surveillance-spying-e-mail-citizens-178/Move over Great Britain! We are working on video surveillance too.

author: saturation
author_rank: Super Contributor
timestamp: December 05, 2012, 03:03:56 pm
content: Not really new, in all institutions today, including commercial ISP, they can monitor all network traffic and read all your data, except if your encrypt it using a proper cypher. So do so, and no worries. In a past life, I did so all the time and its part of most organization's policy. That's how they find illegal traffic, like p*rn within a network.

author: r90s
author_rank: Regular Contributor
timestamp: December 06, 2012, 01:41:32 am
content: I was aware of many aspects of the story years ago, but I refuse to accept the nothing to see here, everything is OK view. If you read the whole thing, then you will see an escalation of things, by a government, that can be used for whatever whim that comes along.See ya in the re-education camp.

author: vk6zgo
author_rank: Super Contributor
timestamp: December 06, 2012, 01:58:40 am
content: Everybody?There are around 300 million people in the USA.Technology is great,but that would be a major project in anyone's estimation.Where does the funding come from?By the way,Barack Obama/George.W.Bush/Bill Clinton/Hilary Clinton/Charlie Sheen/Tom Cruise/Bill Gates/Uncle Tom Cobley/ & all 'n all is the Antichrist.How do I know?Elvis told me!

author: r90s
author_rank: Regular Contributor
timestamp: December 06, 2012, 02:24:25 am
content: Really! The Antichrist, is he back in town?Even in vk land those are apples and oranges.Several years ago the NSA had to revise their transmission lines because the computers were drawing so much power, it was in the news. The funds are already spent on the new computer facilities. The internet backbone was bridged years ago.
PNP negative voltage control - Page 1
Forum section: electronics / general

author: shebu18
author_rank: Frequent Contributor
timestamp: November 26, 2012, 12:40:53 pm
content: Hello all,i want to design a small psu like the tuxgraphix psu. My question is about the negative voltage control. Where can i read about the negative voltage control with a pnp transistor and driving it with a opamp.thank you.

author: sorin
author_rank: Frequent Contributor
timestamp: November 26, 2012, 02:53:42 pm
content: https://www.eevblog.com/forum/projects-designs-and-technical-stuff/bench-power-supply-school-project/msg166244/#msg166244

author: shebu18
author_rank: Frequent Contributor
timestamp: December 04, 2012, 02:13:12 pm
content: Thanks.Some other information about this? i want to make a +/-10V and 1A PSU from a transformer.

author: Thor-Arne
author_rank: Unknown
timestamp: December 04, 2012, 10:44:04 pm
content: What transformer?Using linear regulators would be the first thing I'd consider.Very easy to work with, but dissipate a lot of heat if input voltage is considerably higher than output voltage.(I wonder why nobody using/suggesting the 78xx/79xx series?)

author: TriodeTiger
author_rank: Regular Contributor
timestamp: December 04, 2012, 10:49:28 pm
content: Quote from: shebu18 on December 04, 2012, 02:13:12 pmWell, maybe if you get 15/15V out of the transformer, rectification and regulation will drop the range roughly to 10 or 12V... an LM317 can get you 1.2-10V, and an LM337 will do the same except for the negative rail! You can do some tricks with an op-amp to offset 1.2 to 0V if going down to 0V is important...(assuming you mean adjustable of course!)So in other words, a split secondary (or centre tapped secondary) transformer is what you need to start with. Anywhere from 12 to 18 sounds good... Try to find what VA rating you need yourself as a learning exercise.Constant current should not be too difficult to add, just an op amp, sense resistor and fet might do it...

author: shebu18
author_rank: Frequent Contributor
timestamp: December 05, 2012, 05:58:02 am
content: Sorry, i did not express my self correct. I wnat to make a +/-0-10V 1A PSU with descrete components. I found a solution for the positive part of the coltage control but for the negative part i did not fount one.

author: shebu18
author_rank: Frequent Contributor
timestamp: December 06, 2012, 08:08:24 am
content: I simulated a PNP darlington configuration driven by a op amp and it worked, so i will use this to regulate the negative voltage and a npn darlington to regulate the positive voltage. Now i need to read more about current measurement with op amps.
Flash Memory Survives 100 Million Cycles - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 05, 2012, 08:06:26 pm
content: all you need is heathttp://spectrum.ieee.org/semiconductors/memory/flash-memory-survives-100-million-cycles

author: nukie
author_rank: Frequent Contributor
timestamp: December 05, 2012, 10:03:11 pm
content: I welcome technology but seeing how short lifespan devices are these days I doubt it would help.

author: Psi
author_rank: Super Contributor
timestamp: December 06, 2012, 12:36:30 am
content: HDD's you put in the freezer, SSD you put in the ovenAh well, at least there is symmetry.
Good Info On Batteries... - Page 1
Forum section: electronics / general

author: r90s
author_rank: Regular Contributor
timestamp: December 03, 2012, 08:46:25 am
content: It looks like my other topic has made it's way over the dismal cliff. But in looking for answers to the last wrinkle introduced, I found what seems a good site for information on batteries.http://batteryuniversity.com/learn/http://batteryuniversity.com/learn/article/types_of_lithium_ionFound that the archive section of the menu on the left of page is good. I also finally discovered Dave's fine video tutorials.I hope this is useful to someone.Have Fun

author: TriodeTiger
author_rank: Regular Contributor
timestamp: December 03, 2012, 10:12:47 am
content: That website is amazing, I am glad it exists - I see all sorts of difficult questions being answered by that website that would be so hard to come by otherwise being the average joe...

author: r90s
author_rank: Regular Contributor
timestamp: December 03, 2012, 12:18:47 pm
content: Thank you for the comment..

author: Poe
author_rank: Frequent Contributor
timestamp: December 04, 2012, 07:28:12 pm
content: He doesn't update or support the "Battery university" site. His company site (bushmann.ca) is much better.All the info you find at battery university:http://www.buchmann.ca/toc.aspHis book is only $20 and well worth it.http://www.buchmann.ca/orderbook.aspThe third edition was just released with some really useful lithium stuff.If anyone knows of another good battery source, please link it. I have foundindependentbattery data hard to find.

author: retiredcaps
author_rank: Super Contributor
timestamp: December 04, 2012, 08:47:00 pm
content: Quote from: Poe on December 04, 2012, 07:28:12 pmHave you seen this one by tom66?https://www.eevblog.com/forum/chat/large-scale-battery-test-done-by-me-as-part-of-an-internship/

author: tom66
author_rank: Super Contributor
timestamp: December 04, 2012, 10:27:38 pm
content: Yes, and I am going back over winter to do some more testingHopefully will be able to build a new tester with 9V/AAA/AA/C/D capability, plus a recharging option for NiMH cycle tests -- if I get the time.I have already bought £15 worth of discount shop AA's to test... the winners last time were discount shop ones offering nearly identical capacity to the premium cells.

author: r90s
author_rank: Regular Contributor
timestamp: December 05, 2012, 10:07:51 am
content: Thanks for the links.

author: Dagon
author_rank: Regular Contributor
timestamp: December 05, 2012, 10:58:04 am
content: QuoteThanks for that. Knew about battery university but didn't realise there was a more up to date site.
My name is Optimus Prime!!! - Page 1
Forum section: electronics / general

author: krish2487
author_rank: Frequent Contributor
timestamp: December 05, 2012, 06:18:12 pm
content: Hello Folks!!Quite an interesting bit of news..The japanese have done it again!!an actual 1/12 scale model of (one) transformer..Agreed it is limited of number of combinations of transformations (if that even makes sense!!)but it simply cool to look at.:-D

author: tom66
author_rank: Super Contributor
timestamp: December 05, 2012, 06:26:11 pm
content: I am genuinely impressed.

author: sprocket
author_rank: Regular Contributor
timestamp: December 05, 2012, 06:31:10 pm
content: I didnt know optimus prime could moon dance.. I learn something new every day

author: robrenz
author_rank: Super Contributor
timestamp: December 05, 2012, 07:03:50 pm
content: Wow, that is impressive!

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 05, 2012, 09:14:33 pm
content: Looks like he is using a PS3 controller, that's smart too!
Mastech PSUs good? - Page 1
Forum section: electronics / general

author: WhiteFireDragon
author_rank: Regular Contributor
timestamp: December 05, 2012, 06:20:07 am
content: I'm looking to get thisMastech HY3030EXvariable PSU that can run at 30v 30a, mainly for anodizing aluminum. Is this a good choice or should I look at another brand? Also with a high power PSU like this, is it also accurate and provide clean power in the milliamp and millivolt range for more sensitive electronics?

author: Gall
author_rank: Frequent Contributor
timestamp: December 05, 2012, 08:30:01 am
content: I use HY3003 (30V 3A) for many years. It worked well. Output is well filtered. One issue is that it has no separate output switch nor a relay so it may have spikes at output while powered on. The second one is that now the potentiometers are worn out (after 7 years).

author: T4P
author_rank: Super Contributor
timestamp: December 05, 2012, 08:38:25 am
content: Provide stability down to mV and mA? Are you kidding me?It's a 30amp PSU and it's not even remotely easy to dial in 100mA or so (Not going to be easy either with ten turn pots), in fact it's a switching PSU inside and well i wouldn't expect stability down to a single or double digit mA ... it's just nuts to be expect that from a 30amp SMPSUIf you want a mA stability power supply (really) buy a lower amperage (like 3-5Amps and mod it with ten turn pots) one not something that can taper off 30A!
History of copper wire. - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 03, 2012, 11:20:11 am
content: After having dug to a depth of 10 feet last year, British scientistsfound traces of copper wire dating back 200 years and came to theconclusion that their ancestors already had a telephone network morethan 150 years ago.Not to be outdone by the Brit's, in the weeks that followed, an Americanarchaeologist dug to a depth of 20 feet, and shortly after, a storypublished in the New York Times: "American archaeologists, findingtraces of 250-year-old copper wire, have concluded that their ancestorsalready had an advanced high-tech communications network 50 yearsearlier than the British".One week later, the New Zealand Herald, reported the following:"After digging as deep as 30 feet in his backyard in Onerahi, Bill Pakua self-taught archaeologist and avid Motorhomer reported that hefound absolutely fuck all. Paku has therefore concluded that 250 yearsago, New Zealand had already gone wireless."

author: r90s
author_rank: Regular Contributor
timestamp: December 03, 2012, 12:43:45 pm
content: Oh My!

author: ceecrb1
author_rank: Contributor
timestamp: December 03, 2012, 12:50:52 pm
content: But we all know that copper wire was invented by two scottsmen fighting over a penny!(yeah i'm scottish and yes its stealing a billy connolly joke).

author: AlfBaz
author_rank: Super Contributor
timestamp: December 03, 2012, 10:54:12 pm
content: Quote from: Ed.Kloonk on December 03, 2012, 11:20:11 amLOL, Thats a shame for the yanks, 250 years ago it was still a british colony, win, win for the poms

author: free_electron
author_rank: Super Contributor
timestamp: December 04, 2012, 01:44:30 am
content: Now , we have copper wire in the ground. But does anyone know why the telephone network uses a NEGATIVE voltage of -48 in respect to the earth potential ?No? well simply becasue of electromigration. If you apply a positive voltage to a copper wire embedded in humid earth , and the isolation were to break down you will slowly dissolve the copper wire... copper ions will break away and dissolve in planet earth leaving you with an open wire after a few years. Using a negative voltage would only make the wire thicker if there were copper deposits in the vicinity.

author: Wartex
author_rank: Frequent Contributor
timestamp: December 04, 2012, 05:01:48 am
content: Less politically correct:- How was the copper wire invented?- Two jews fighting over a penny.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: December 04, 2012, 05:12:54 am
content: Quote from: free_electron on December 04, 2012, 01:44:30 amOnce again, this old xkcd strip becomes relevant:
SeeedStudio.com - Page 1
Forum section: electronics / general

author: perfect_disturbance
author_rank: Regular Contributor
timestamp: December 03, 2012, 11:38:07 pm
content: Is SeeedStudio.com down for everyone else?

author: ecat
author_rank: Frequent Contributor
timestamp: December 03, 2012, 11:50:47 pm
content: http://www.downforeveryoneorjustme.com/http://www.downforeveryoneorjustme.com/SeeedStudio.comBut, yes. It looks broken for me too

author: perfect_disturbance
author_rank: Regular Contributor
timestamp: December 03, 2012, 11:54:01 pm
content: OK ecat that's pretty awesome I can't I've never seen it before.

author: ecat
author_rank: Frequent Contributor
timestamp: December 04, 2012, 12:01:42 am
content: hehe,bloody useful when you need itI never remember the URL, just google isitjustme and there it is.
CERN C'est Ne Pas Sorcier But Zombies ? - Page 1
Forum section: electronics / general

author: free_electron
author_rank: Super Contributor
timestamp: December 04, 2012, 01:47:14 am
content: a great, just what we need. more stuff to scare the dimwits so they can protest against scientific progress.

author: tom66
author_rank: Super Contributor
timestamp: December 04, 2012, 02:01:20 am
content: Looks cool.Anyone who takes it seriously is too stupid to convince otherwise -- I doubt it will affect the anti-science minority.

author: AlfBaz
author_rank: Super Contributor
timestamp: December 04, 2012, 02:37:35 am
content: LOL, another well thought out, original plot.Why is it that whenever humans get exposed to the unknown they become flesh eating psychopaths?If they're gonna re-hash the same story line why not something like "The computer wore tennis shoes" (http://en.wikipedia.org/wiki/The_Computer_Wore_Tennis_Shoes) . Loved it as a kid, probably one of the things that turned me to electronics
Ceramic SMD capacitor failure - Page 1
Forum section: electronics / general

author: Pentium100
author_rank: Frequent Contributor
timestamp: December 03, 2012, 04:40:47 am
content: I just finished repairing a server power supply. Finally tracked down the problem to a leaky ceramic cap (about 1uF) used for power-on reset. Its resistance was around 1M. I replaced it with a new one and now the power supply works OK (I hate 0603 components - they are a PITA to solder). Last time I encountered a bad non-electrolytic capacitor was in a >40 year old device (all the paper caps in it were leaky).So, I wanted to ask you - do ceramic caps develop low resistance usually or was my cap somehow manufactured faulty or damaged?

author: TerraHertz
author_rank: Super Contributor
timestamp: December 03, 2012, 07:01:34 am
content: Are you sure it wasn't just some conductive surface contamination, of the component or PCB? Not far between the end metalizations on 0603.That's kind of the opposite problem to one I've found several times now in cheap switchmode supplies. Some of them use a 1M resistor for a trickle start-up of the switcher on the mains side. So there's an approximately 1/4W metal film resistor with near full rectified mains voltage across it. They eventually go open circuit, so the supply never starts. Even though it would run fine if it did start. And because it's a 1M resistor, and the surrounding circuit has more leakage than that, with the resistor in circuit you can't tell it's open.I think it must be a kind of electro-migration of the metalization on the resistor.Replace it with two 470K R in series, and they work.

author: JuKu
author_rank: Frequent Contributor
timestamp: December 03, 2012, 08:03:57 am
content: Quote from: Pentium100 on December 03, 2012, 04:40:47 amNo. Yes. (I'd guess mechanical damage by flexing the circuit board.)

author: free_electron
author_rank: Super Contributor
timestamp: December 03, 2012, 08:05:11 am
content: Multiple possibilities. Cracking is the most likely cause. Body cracks and this causes an internal short.

author: SeanB
author_rank: Super Contributor
timestamp: December 03, 2012, 03:30:31 pm
content: Ceramic chip caps are very prone to shorting, often as a result from ESD ( there is a NASA study about this) that causes a weak spot that grows whiskers, or from cracking from stress during handling, soldering or mounting of the board. They were famous for this in early encasulated ceramic caps which could burn a hole through a board when they failed.

author: Pentium100
author_rank: Frequent Contributor
timestamp: December 03, 2012, 03:32:04 pm
content: I did not see any surface contamination.The power supply is not a cheap one (a new one costs ~$150 IIRC) and it worked for some time before failing.
How Many DMX Controllers  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 02, 2012, 09:41:52 pm
content: that is a hell of lot of dmx controllers watch thishttp://lightsondisplay.com/2012.html

author: ceecrb1
author_rank: Contributor
timestamp: December 02, 2012, 10:36:32 pm
content: Its kind of hard to tell and although I didnt have a good read into it, there was no obvious information standing out..I dont think there are that many universes involved but as hes got video going i'm guessing its got artnet if hes up to date, or midi and some media server sofware such as resolume, arkaos or screen monkey.The main thing is there is a LOT of prep time involved here.. some wysiwyg or capture polar software mockup of the rig connected to the lighting desk and running through it with time code step by step.... and thats not involving making up the fixtures etc.I hate christmas, but the guy really makes a good show of it.

author: Sionyn
author_rank: Frequent Contributor
timestamp: December 02, 2012, 10:49:16 pm
content: he was on leo laportes twit it all runs through a old hp running windows xpmore detail of his stuff here LOR DMXhttps://www.facebook.com/LightsonDisplay

author: David_AVD
author_rank: Super Contributor
timestamp: December 03, 2012, 08:05:51 am
content: I have a mixture of conventional DMX (RS485) and DMX over IP (E1.31) in my display this year. Only 600 channels used though.Some of the more hardcore people have dozens of DMX universes in their displays.
Circuit board holder. PanaVise? - Page 1
Forum section: electronics / general

author: WhiteFireDragon
author_rank: Regular Contributor
timestamp: December 03, 2012, 05:16:30 am
content: I'm looking to buy a circuit board holder, and all the panavise ones can only hold up to ~10" boards. I want it to be able to hold full ATX motherboards too, or keyboard PCB. I'm leaning towards buying thispanavise 324, which is the largest model, but it can only hold up to 12" PCBs. Are there any alternatives that you guys use to hold large PCBs?

author: george graves
author_rank: Super Contributor
timestamp: December 03, 2012, 05:32:14 am
content: Is there anything in this tread that would work for you?https://www.eevblog.com/forum/beginners/pcb-board-holder-what-are-you-using/Or you can buy that panavice, and just but a length of bar that is the horizontal bar, and cut it to what ever length you want.
Multimeter reviews by youtube user NoIdeaHowToCallMe (German) - Page 1
Forum section: electronics / general

author: retiredcaps
author_rank: Super Contributor
timestamp: December 02, 2012, 12:07:48 am
content: I don't understand German, but for those who do, this person has done a couple of multimeter reviewshttps://www.youtube.com/user/NoIdeaHowToCallMe

author: IanB
author_rank: Super Contributor
timestamp: December 02, 2012, 01:39:26 am
content: You can turn on captions and set automatic translation to English--the result is not too bad.

author: EEVblog
author_rank: Unknown
timestamp: December 02, 2012, 02:28:13 am
content: Martin Lorton has plenty of multimeter reviews too:https://www.youtube.com/user/mjlortonDave.

author: Achilles
author_rank: Regular Contributor
timestamp: December 02, 2012, 12:53:00 pm
content: ...Nice. I just took a quick look. He also had an DOA Agilent Multimeter U1273A.They also claimed they couldn't check if it's under still warranty....WTF?!?!?! I had other experience.Come on Agilent....work on your QC!

author: retiredcaps
author_rank: Super Contributor
timestamp: December 02, 2012, 10:49:21 pm
content: Quote from: IanB on December 02, 2012, 01:39:26 amThanks for the suggestion. I tried that and noticed the translate captions says beta. After watching for a few minutes, I decided that for this video, the term "beta" is being overly generous.It is interesting technology and could be the beginnings of the Universal translator.
Simple Question. owon sds7102 vs rigol ds1102e Which should I get? - Page 1
Forum section: electronics / general

author: ElectonicaThomas
author_rank: Newbie
timestamp: December 03, 2012, 12:42:15 am
content: I know Dave likes the Rigol, but I like the idea of a bigger screen ie Owon. I am a hobbyist, so for a first DSO either should be adequate. Any Thoughts? How about a Owon review Dave. Cheers Thomas.
cathay pacific, lithium batteries. Need help understanding watthours. - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 02, 2012, 04:38:31 am
content: Hi.http://www.cathaypacific.com/cpa/en_AU/helpingyoutravel/batteriesQuoteI'm trying to figure out my batteries that I will take away with me. And want to understand as much as I can in case I get pinged.A camera battery I just looked at says 3.7v, 1100mAh. Do you just multiply the two to get watt hours?

author: RCMR
author_rank: Frequent Contributor
timestamp: December 02, 2012, 04:41:16 am
content: Yes you do... so the watt/hr capacity of that battery is 4.07 W/H.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 02, 2012, 04:45:59 am
content: Quote from: RCMR on December 02, 2012, 04:41:16 amThat's exactly what my calculator said too!Thank you.

author: Bored@Work
author_rank: Super Contributor
timestamp: December 02, 2012, 08:12:58 am
content: Quote from: RCMR on December 02, 2012, 04:41:16 amIt is Watt times hour, not Watt divided by hour, dammit.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: December 02, 2012, 09:42:48 am
content: Quote from: Bored@Work on December 02, 2012, 08:12:58 amhahaha.Yes. You are right. The slash needs slashing.
Life story - Page 1
Forum section: electronics / general

author: poptones
author_rank: Frequent Contributor
timestamp: December 02, 2012, 04:52:50 am
content: Jason Greenblat, 59, of Brooklyn NY was walking home from work one day when, as he crosses the street, he is run down by a driver in a Chevy Volt. Unable to hear the car coming, and the driver being drunk and unable to pay proper attention, he was hit essentially at full speed, rolled over the top of the car and into the gutter where he was later found badly bleeding and unconscious. He was taken to the medical center, where he spent several months recovering from the accident. He had suffered such a concossion he was barely able to walk and had to undergo months of physical therapy before he could once again function in society.After being released from the hospital he was finally able to return to work. He spent several months readjusting to his old work, rebuilding his social life and trying to rebuild a sense of normalcy and a rhythm. Then, one day as he was walking home, two musicians who were preparing for a gig dropped a Marshall head out of a fifth story window, which struck Jason in the head, killing him instantly.And so the life lesson: it's not the Volts that kill you, it's the amps.

author: AlfBaz
author_rank: Super Contributor
timestamp: December 02, 2012, 05:15:01 am
content: ROFL !!

author: ivan747
author_rank: Super Contributor
timestamp: December 02, 2012, 05:31:32 am
content: Well, that was unexpected XD

author: SeanB
author_rank: Super Contributor
timestamp: December 02, 2012, 05:35:52 am
content: There I was thinking that you were going to go off at a high tension.......... But then you just amped up the irony, or is that just the inductance peaking.
Soldering in office - Page 1
Forum section: electronics / general

author: itdontgo
author_rank: Regular Contributor
timestamp: November 30, 2012, 08:22:28 am
content: My company is moving to a new office and most production is being done externally. However some low volume stuff will need finishing in the office i.e. soldering wires on to the PCB for assembly.Would this kind of soldering iron use be likely to set off a smoke detector? We just have normal bench extractor fans and will get some iron mounted fume extractors. Does anyone have experience of this?

author: EEVblog
author_rank: Unknown
timestamp: November 30, 2012, 09:27:24 am
content: Only time I've even seen (heard!) it happen is when someone was desoldering some old arcade boards - that lovelyold smell.Dave.

author: JuKu
author_rank: Frequent Contributor
timestamp: November 30, 2012, 11:02:07 am
content: You get trouble from worker's health concerns much before you get trouble from fire alarms.

author: itdontgo
author_rank: Regular Contributor
timestamp: December 01, 2012, 07:55:13 am
content: OK thanks. I can imagine how embarrasing it would be if the whole building was evacuated because of my soldering irons!

author: nanofrog
author_rank: Super Contributor
timestamp: December 01, 2012, 05:49:20 pm
content: Quote from: itdontgo on December 01, 2012, 07:55:13 amI would think you'd be fine using HEPA & gas filter based fume extractors (either iron fitted as you mentioned, or a larger unit that has an intake you move to the board work area), as it pulls the smoke out of the air.

author: T4P
author_rank: Super Contributor
timestamp: December 01, 2012, 06:19:28 pm
content: Be careful with HEPA though, they are very air restrictive so they should be at the back of a fan and you need a very uber high pressure fan for itThat's why you mostly see them on good vacuum cleaners that are cyclone-based or whatever it's called

author: bitwelder
author_rank: Super Contributor
timestamp: December 01, 2012, 07:43:55 pm
content: Quote from: itdontgo on December 01, 2012, 07:55:13 amBlame the "uncalibrated" fire alarm system!

author: IvoS
author_rank: Frequent Contributor
timestamp: December 01, 2012, 11:51:23 pm
content: If you have photo-electric type of smoke detectors, the only concern would be if the actual smoke (or dust) hits the smoke chamber. If you use fume extractor you should be fine. Ionization type of smoke detectors are more sensitive.

author: nanofrog
author_rank: Super Contributor
timestamp: December 02, 2012, 12:34:56 am
content: Quote from: T4P on December 01, 2012, 06:19:28 pmI was thinking of a commercial unit when I mentioned this (Hakko, Weller, ...), not building one.
This CAN'T be an original topic... - Page 1
Forum section: electronics / general

author: FrankenPC
author_rank: Unknown
timestamp: December 03, 2012, 07:55:27 pm
content: Requesting another touring test verification image blanks out everything you've typed.This has probably been reported a lot. So what. Add me to the list of appalled users. Whoever programmed the forum needs to be taken out behind the tool shed..

author: SeanB
author_rank: Super Contributor
timestamp: December 03, 2012, 08:05:13 pm
content: Post a little more, then you are assumed to be human, or at least a reasonable facsimile of one.................Of course, if you post corned pork and/or poultry then you will find those posts relocated into the heat death of the universe.

author: EEVblog
author_rank: Unknown
timestamp: December 03, 2012, 09:06:15 pm
content: I think it does this for the first few posts only.Dave.

author: FrankenPC
author_rank: Unknown
timestamp: December 04, 2012, 04:51:01 pm
content: Quote from: EEVblog on December 03, 2012, 09:06:15 pmo_0...