hybridfree/eevblog-posts huggingface dataset:
Weller EC2100 Soldering Station - Page 1
Forum section: electronics / general

author: philbaker
author_rank: Contributor
timestamp: November 29, 2012, 09:49:08 pm
content: Does anyone know about the internal layout/design of this station? My EC2100 has developed a fault, in that the display is stuck on "999" all the time. When there is no iron plugged in what should the display be? The iron's thermistor seems ok, it increases resistance when the tip is warmed. What is likely to be gone inside the station and is it fixable?

author: FenderBender
author_rank: Super Contributor
timestamp: November 29, 2012, 10:07:48 pm
content: While not stuck on 999, I've heard Weller irons getting stuck or blicking a certain number...http://linuxfocus.org/~guido/wesd51-blinking-888/Take a look at that. Gee another electrolytic capacitor related problem...

author: philbaker
author_rank: Contributor
timestamp: November 30, 2012, 07:57:20 am
content: Many thanks for the reply. It looks like that may well be a very good clue to the problem. The ec1201 iron on this station is not a magnastat as it has a thermistor not a magnetic sensor. However the electronic problem with faulty capacitor is probably similar and I'll look inside the case.....
ESR Meter Kit, back in stock @ Altronics  - Page 1
Forum section: electronics / general

author: Cozzmo
author_rank: Regular Contributor
timestamp: November 30, 2012, 04:01:37 am
content: Just a friendly reminder that the original DSE style black Jiffy Box version of the ESR Meter kit is back in stock at Altronics K2574). Fresh run of the kits (23/11/2012!). I purchased mine from the Sydney store, and although the website is yet to be updated to reflect the fact that they are in stock.While i like all things new, the blue version just doesn't tickle my fancy, i wanted the 'old' box style with Red displays so waited it out until the new batch run became availible. Soldering iron heating as i type!Cheers.

author: necroscope
author_rank: Regular Contributor
timestamp: November 30, 2012, 11:11:14 am
content: Thanks for the heads up mate,I tried to order one about 6 weeks ago but they ended up not having any and had to get a refund,will try again.

author: Cozzmo
author_rank: Regular Contributor
timestamp: November 30, 2012, 08:40:40 pm
content: All was going well until it turns out its missing the 1K resistors (since moving i cant find my box that has my resistor packets in it!) and some washers for the metal standoffs so the LEDs now hit the acrylic panel is annoying. I have to go back today and hit them up for the missing parts. Such a pain because Jaycar is closer.It will be worth it in the end i'm sure.

author: Cozzmo
author_rank: Regular Contributor
timestamp: December 01, 2012, 01:01:10 am
content: Ended up going to Jaycar, i got lazy, washers and resistors and a bit of time spent calibrating and making nice all done.Shame though, the caps i was sure were dead (i replaced them and an amplifier came back to life) tested OK on the meter (6800uf 80v - 0.02ohms). Oh well !Good little project none the less. I think a 10 turn pot would be better for the calibration though because its quite sensitive and just between calibration and final assembly it had flicked over to the next digit when i checked it. I tried to set the pot right in the middle of where it wanted to change between the two +1 / -1 when i did the calibration, but maybe i failed with that.
Zeners from Down Under - Page 1
Forum section: electronics / general

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 30, 2012, 10:42:13 am
content: Just noticed on a label from a Farnell package - they make Zener diodes in Australia - who knew...http://uk.farnell.com/vishay-semiconductor/1n5231b/diode-zener-5-1v-0-5w/dp/1612371?Ntt=1612371

author: EEVblog
author_rank: Unknown
timestamp: November 30, 2012, 11:02:06 am
content: Must be at the same factory they make pixie dustDave.

author: firewalker
author_rank: Super Contributor
timestamp: November 30, 2012, 11:27:33 am
content: QuotePackaging?:P:PAlexander.

author: SeanB
author_rank: Super Contributor
timestamp: November 30, 2012, 04:21:42 pm
content: That was the biggest value add process, all the hand labour at first world rates..........

author: free_electron
author_rank: Super Contributor
timestamp: November 30, 2012, 11:18:50 pm
content: A normal zener zeners in reverse and is a diode in forwar. Ff it comes from down under does that mean it zeners in forward and is a diode in reverse ? Oh, and watch the counterspin on those electrons in the depletion zone ...

author: c4757p
author_rank: Super Contributor
timestamp: November 30, 2012, 11:34:22 pm
content: Yes, it works in Zener mode forward and normal mode backward. Even better, they paint the stripe on the other side, so you end up connecting it the wrong way around.

author: ivan747
author_rank: Super Contributor
timestamp: December 01, 2012, 12:11:45 am
content: I had some issues on my Zener diode voltage reference. For some reason the thermal coefficient seems to be inverted.
Can LCD scratches be removed? - Page 1
Forum section: electronics / general

author: MikeK
author_rank: Super Contributor
timestamp: November 29, 2012, 01:08:38 am
content: Has anyone successfully removed scratches from an LCD?This is a Nokia 5110 and the metal cover does come off to give access to the screen. Maybe some 1000 grit wet/dry sandpaper and then rubbing compound? Or would I just wind up with a foggy display?

author: JuiceKing
author_rank: Regular Contributor
timestamp: November 29, 2012, 01:11:42 am
content: Toothpaste works wonders.

author: TorqueRanger
author_rank: Frequent Contributor
timestamp: November 29, 2012, 01:16:22 am
content: Try a buffing wheel...

author: notsob
author_rank: Frequent Contributor
timestamp: November 29, 2012, 02:16:05 am
content: Watch this video from NOVUShttp://www.novuspolish.com/for the 'plastic' cover part.

author: peter.mitchell
author_rank: Super Contributor
timestamp: November 29, 2012, 02:41:57 am
content: 1000 grit wouldn't be sufficient, 2000-3000 would be necessary but you need it to be done evenly, which is hard, and you need to not break the lcd, which is even harder.

author: RCMR
author_rank: Frequent Contributor
timestamp: November 29, 2012, 03:43:43 am
content: Aren't those LCDs available on eBay for like $1 a pop?Is it really worth wasting the time/effort when you could replace it for pocket-change?

author: MikeK
author_rank: Super Contributor
timestamp: November 29, 2012, 04:35:49 am
content: It was $5 from Deal Extreme (from China). The two I bought came from China already scratched. Looking on ebay, it looks like about $3 and another 3 weeks for another lottery ticket shot at it.

author: jeroen74
author_rank: Frequent Contributor
timestamp: November 29, 2012, 08:07:54 am
content: They're most likely pulled units.

author: Sionyn
author_rank: Frequent Contributor
timestamp: November 29, 2012, 08:36:21 pm
content: my granddad gpo engine swaered by brasso

author: aluck
author_rank: Regular Contributor
timestamp: November 30, 2012, 01:19:28 am
content: https://www.eevblog.com/forum/beginners/scratches-on-plastic-how-to-polish/

author: T4P
author_rank: Super Contributor
timestamp: November 30, 2012, 06:57:29 am
content: Quote from: jeroen74 on November 29, 2012, 08:07:54 amNo that's not the case, it's due to shipping.
Grease for old HP equipment? - Page 1
Forum section: electronics / general

author: WorldPowerLabs
author_rank: Regular Contributor
timestamp: November 29, 2012, 08:12:26 pm
content: Hello EEvbees,I own an old HP 240D audio oscillator. While the unit is in excellent shape electronically, the old grease on the gears and other moving parts within has oxidized and become gummy.I have received two different (and conflicting) suggestions from Agilent -- one with the disclaimer that the greases referenced in the service literature are no longer relevant and that his suggestions are not official Agilent recommendations, per se.One recommendation was to use dielectric grease (silicone). The other was white lithium grease. Naturally, I'll do my best to clean out the old gunk before replacing with anything new.Does anyone have a favorite grease for this sort of application? I've used white lithium before, and it always seems to separate into the oil and the soap base after a while.Thanks!-Ben

author: robrenz
author_rank: Super Contributor
timestamp: November 29, 2012, 08:35:07 pm
content: IMO steer clear of dielectric grease It has its place but general lubrication is not one of them. Silicone is next to impossible to remove and it also migrates on its own to places you dont want it to. Under certain conditions it can form silicon carbide a very effective abrasive.This threadcovers its quirks fairly well.Tri-flow synthetic grease is pretty good stuff for general mechanical lube (not for contacts). Most test instrument lubrication requirements are very low speed and load and is not that demanding anyhow.I like Caig Deoxit gold G100L for contactlubricationand Caig Deoxit D100L for contactcleaning.

author: WorldPowerLabs
author_rank: Regular Contributor
timestamp: November 29, 2012, 10:32:32 pm
content: Robrenz, good info -- thank you. I don't particularly like silicone greases because of their tendency to migrate, as you've noted. I'll probably try the Tri-flow synthetic grease. These parts needing lubrication are indeed purely mechanical (no contacts).I use Deoxit (red, in various concentrations) for contact cleaning and Deoxit (gold, 100%) for preservation and lubrication, too. I particularly like to use the latter on switches where the contacts are pads on a PCB and metal wipers slide across them, as in many multimeters.Thanks again...-Ben
Discovery could revolutionize semiconductors ? - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: November 29, 2012, 12:29:36 am
content: Even smaller electronics ? Time to start saving for an electron microscope to add that new parthttp://www.lunduniversity.lu.se/o.o.i.s?id=24890&news_item=5962Quote

author: FenderBender
author_rank: Super Contributor
timestamp: November 29, 2012, 12:41:43 am
content: English?
Samsung Quality Assurance Testing Testing Jig - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: November 28, 2012, 12:03:05 am
content: quite intresting???? ??, ?? ?? ???!

author: EEVblog
author_rank: Unknown
timestamp: November 28, 2012, 12:12:04 am
content: How to you calibrate the bum?Dave.

author: T4P
author_rank: Super Contributor
timestamp: November 28, 2012, 06:40:19 am
content: The "durable and waterproof" part got me laughingThe S3 is VERY far from durable, how durable is a phone that breaks easily when dropped?Waterproof ... i have heard many S3's getting damaged just by walking in drizzles

author: Colfaxmingo
author_rank: Contributor
timestamp: November 28, 2012, 05:36:33 pm
content: I for one would like to welcome our new robotic butt overlords.PS Rule 43 in 5...4...3...2...

author: SeanB
author_rank: Super Contributor
timestamp: November 28, 2012, 07:27:29 pm
content: Quote from: EEVblog on November 28, 2012, 12:12:04 amTill it just breaks an iPhone display....................

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 28, 2012, 07:33:41 pm
content: Quote from: Colfaxmingo on November 28, 2012, 05:36:33 pmDon't you mean rule 34? Rule 43 is usually "the more beautiful and pure a thing is, the more satisfying ti is to corrupt it". (Though this varies.) Rule 34 is the "there's porn of it" rule.
EEVBlog forum style :) - Page 1
Forum section: electronics / general

author: nardev
author_rank: Unknown
timestamp: November 28, 2012, 04:57:35 am
content: If you don't like SO SMALL "« previous next »" buttons, you don't need to ask Dave to change thatI hate looking in corners and navigating to those small buttons. So i changes some things for myselfJust install Google chrome or Firefox Stylish plugin:https://chrome.google.com/webstore/detail/stylish/fjnbnpbmkenffdnngjfgmeleoegfcffeAnd make a style with this dataApplies to: URL starting with:https://www.eevblog.com/forumAnd styles:.nextlinks_bottom, .nextlinks {height: 14px;clear: both;padding: 15px 0;}.nextlinks_bottom a, .nextlinks a {color: #fff;background-color: #9FC54E;padding: 3px 5px;margin-top: 5px;font-size: 18px;border-top-left-radius: 5px;border-top-right-radius: 5px;border-bottom-left-radius: 5px;border-bottom-right-radius: 5px;clear: both;}.pagesection {font-size: 16px;}center { display: none; }and you will get big buttons
Shopping With Dave - Page 1
Forum section: electronics / general

author: BobC
author_rank: Unknown
timestamp: November 29, 2012, 02:29:21 am
content: At work we were just asked to put in our wish-list for the 2013 lab equipment budget. Everything I submitted came from EEVBlog posts, and EEVBlog sponsors where possible:1. Mantis Elite (with LED Dimmer Hack!)2. Rigol or Owon Basic 100 MHz o'scope (from sponsor Saelig)3. Three Basic DMMs (best of the under $100 units)We already have at least one of each type of high-quality instrument (all regularly calibrated): We just need more knock-around gear for regular work, stuff that won't get calibrated every often, if ever. In prior years I put in for more of what we already had: Le Croy, Agilent, Fluke, Keithley, and other name-brands, and got little or none of it, unless we found it used on eBay.This year I expect to get everything, though the Mantis may take some arm-twisting.Thanks, Dave!-BobC

author: EEVblog
author_rank: Unknown
timestamp: November 29, 2012, 05:40:48 am
content: Thanks Bob, much appreciatedDave.

author: BobC
author_rank: Unknown
timestamp: November 30, 2012, 03:47:42 am
content: Got the word today that everything BUT the Mantis will be bought this year using the remaining 2012 budget. Our VP (my boss) was amazed at the value and performance available in equipment priced at 1/3 to 1/2 the price of the lowest-end name-brand equipment. He called it a "no-brainer", well worth trying at least once.This also means the Mantis Elite should have a very good shot in the 2013 budget. But my boss was concerned that if Engineering got one, then Production would want one too. I told him we could get multiple bases for the arm, making it easier to move where it's needed. I think we may have put another one into the "no-brainer" category.Thanks again, Dave!-BobC

author: BobC
author_rank: Unknown
timestamp: November 30, 2012, 03:55:21 am
content: P.S.: Thanks for helping me look great at work: This may affect my next review, and thus my bottom-line.

author: SeanB
author_rank: Super Contributor
timestamp: November 30, 2012, 04:35:44 am
content: Suggest in the request that it will reduce eye strain, and thus the reject rate......

author: Neilm
author_rank: Super Contributor
timestamp: November 30, 2012, 03:33:17 pm
content: Get a demo of the Mantis arranged and make sure the VP sees it vs fixed microscopes. My first company was a very small company (6 employees) that didn't do much SMD work so we didn't have much rework facilities except what a person bought personally (in my case a head band magnifier).When I moved to a larger company and found out about the Mantis it made a huge difference to soldering.Neil
ECA324E very old op-amp - Page 1
Forum section: electronics / general

author: DavidDLC
author_rank: Frequent Contributor
timestamp: November 27, 2012, 07:28:15 pm
content: Hi, I have looked on the www for the ECA324E datasheet and was not able to find it.I want to know the features of this op-amp to look for a replacement. Does anybody have the datasheet of this circuit by a chance ?Or do you know where can I buy this ancient IC ?I can use the LM324 as a replacement, but I would like to know a better quality quad-opamp to be used instead of the LM324.Please guys post your comments.The David.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 27, 2012, 07:56:24 pm
content: It's a standard pinout, so there are loads of compatible devices. The standard answer would be TL074. Of course, there are better speced parts than that. Google for TL074 substitute and read your brains out.

author: poptones
author_rank: Frequent Contributor
timestamp: November 27, 2012, 09:34:42 pm
content: That can be a dangerous assumption. LM324 has a low gbp, liw input and offset current, fairly low input impedance and inputs can swing to ground. A bifet amp in the same position could behave very differently.If an LM324 was used there originally chances are it doesn't need to be anything better. Why not just put one back in there?

author: c4757p
author_rank: Super Contributor
timestamp: November 27, 2012, 10:36:08 pm
content: Quote from: poptones on November 27, 2012, 09:34:42 pmI second that from experience, from a circuit I was just working on. The 324's output can swing to ground, so it can be operated in comparator mode. The TL074's output won't even drop below a VBEthreshold, let alone swing anywhere near ground, so you can't use it as a comparator without throwing something in (I used a ~4V Zener) to drop the voltage.

author: DavidDLC
author_rank: Frequent Contributor
timestamp: November 27, 2012, 11:43:48 pm
content: Thanks for your comments, I totally forgot to comment that is used on a Teac equalizer that I bought as non-working unit on Ebay, I already probed that replacing the damaged ECA324E with a LM324 works.This is a picture that I found on the internet from a different equalizer, but the boards are exactly the same.Will the TL074 work here ?The David

author: poptones
author_rank: Frequent Contributor
timestamp: November 27, 2012, 11:46:40 pm
content: A tl074 may work in that. It will change the frequencies a bit and may cost you some headroom, but will probably sound better when used within its limits. Changing one without changing them all will, however, be pointless.

author: free_electron
author_rank: Super Contributor
timestamp: November 28, 2012, 01:40:49 am
content: oh wow. the bottom two still sport the olde Samsung logo... like from mid 80's ...
Hyperlink for the clueless like me - Page 1
Forum section: electronics / general

author: robrenz
author_rank: Super Contributor
timestamp: November 27, 2012, 04:13:41 pm
content: Yeah I know, I am the only person on the forum who did not know how to do a hyperlink.Just in case, this is what I cut and paste when I need one. Replace the "URL" and "TOUR TEXT" with your data.Code:<a href="URL">YOUR TEXT</a>

author: Bored@Work
author_rank: Super Contributor
timestamp: November 27, 2012, 06:52:24 pm
content: Quote from: robrenz on November 27, 2012, 04:13:41 pmCode:[url=URL]TEXT

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 27, 2012, 08:16:46 pm
content: Google it!Code:[url=www.google.com]Google it!

author: HackedFridgeMagnet
author_rank: Super Contributor
timestamp: November 27, 2012, 10:52:44 pm
content: there is a button underneath the italic button that does a hyperlink over a selected url.

author: robrenz
author_rank: Super Contributor
timestamp: November 27, 2012, 11:02:53 pm
content: I have used that button to do a hyperlink but I didn't know how to add the text so the text is all that showed on the post. The method I showed was the first thing I googled. Now that I see Baw's code I can see what to add to what the url button pastes.Thanks all.
DIL switch - Page 1
Forum section: electronics / general

author: slashguitar
author_rank: Contributor
timestamp: November 27, 2012, 02:34:05 pm
content: Hello,I need to switch 8 data lines simultaneously ON or OFF. Has anyone seen a DIL switch where all the switches are connected together.What other alternatives do I have(It needs to be a mechanical switch-low voltage low current)Thanks

author: G7PSK
author_rank: Super Contributor
timestamp: November 27, 2012, 03:09:13 pm
content: You could glue a bar across all the toggles of a normal dil switch so that they can all be operated as one.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 27, 2012, 03:41:18 pm
content: Digikey stock some 4-pole ones, but expensive. As above, a standard switch with maybe a piece of PCB glued carefullt to operate simultaneously.I have seen 8-way 0.1" jumper blocks, which may be an alternative :http://uk.mouser.com/ProductDetail/FCI/69145-208/?qs=sGAEpiMZZMtsLRyDR9nM1wH1ETOqFdV87Hxqogqwflk%3d

author: senso
author_rank: Frequent Contributor
timestamp: November 27, 2012, 03:55:50 pm
content: An octal buffer with a single DIP switch connected to the enable pin, would that work?

author: ecat
author_rank: Frequent Contributor
timestamp: November 27, 2012, 04:07:18 pm
content: Not cheap but a pair of 4-poll or 6-poll wafer switches on one shaft?http://uk.farnell.com/jsp/search/browse.jsp?N=2031+204324&Ntk=gensearch&Ntt=wafer+switch&Ntx=mode+matchallpartialI'm sure you could once get stacking latching push button switches - my old man used to build studio mixing desks, but the best I can find is this 6-poll Alpshttp://uk.farnell.com/alps/spuj195500/switch-6pole-latching/dp/1123859Two of these, or the 4-poll equivalent and some sort of push bar?

author: slashguitar
author_rank: Contributor
timestamp: November 27, 2012, 05:01:58 pm
content: Thanks for the suggestions. I think I am going to use the jumper blocks mike suggestedThe ones from Alps also look great but they're a bit too big for my application.Thanks,Mihai
Can someone tell me what's going wrong???? - Page 1
Forum section: electronics / general

author: kgavionics
author_rank: Regular Contributor
timestamp: November 26, 2012, 02:05:18 am
content: hii'm trying to do a lab at home about op amp integrator and i have a weird problemnormally, i'm supposed to have a triangle wave in the output, i don't understand why i have a problem for positive output slope.can some one help me please

author: IanB
author_rank: Super Contributor
timestamp: November 26, 2012, 02:14:18 am
content: What happens if you make the period of the square wave shorter?

author: kgavionics
author_rank: Regular Contributor
timestamp: November 26, 2012, 02:58:57 am
content: Quote from: IanB on November 26, 2012, 02:14:18 amthank you for replynothing happens, but if i increase the input signal to the maximum of my generator (10 Vpp) i get most likely a triangle wave.this problem is getting me crazy, i'm giving up and i'm going to sleep...

author: IanB
author_rank: Super Contributor
timestamp: November 26, 2012, 03:33:45 am
content: Don't you need a resistor in parallel with the integrating capacitor to keep the output triangle wave centered around zero and stop it drifting? Remember that any tiny DC offset in your input square wave will be integrated to the limit unless this is compensated.

author: kgavionics
author_rank: Regular Contributor
timestamp: November 27, 2012, 02:34:49 am
content: Quote from: IanB on November 26, 2012, 03:33:45 amThank you so much Ianb, the trick is working finehere's the proof

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 27, 2012, 03:56:09 am
content: Out of curiosity, what are your power rails for the op amp?

author: kgavionics
author_rank: Regular Contributor
timestamp: November 27, 2012, 01:18:41 pm
content: Quote from: nitro2k01 on November 27, 2012, 03:56:09 am+- 12 V

author: jabramo
author_rank: Regular Contributor
timestamp: November 27, 2012, 03:10:31 pm
content: There's a video talking about exactly this made by the Signal PathHere's the first part out of 3
Finally! A hybrid Honda - A hybrid 1994 Honda... - Page 1
Forum section: electronics / general

author: poptones
author_rank: Frequent Contributor
timestamp: November 26, 2012, 10:41:39 pm
content: I've been wondering for years why someone hasn't produced a kit like this. Now all I need is that 2007 Scion xB and for less than ten grand I can have a cool 4wd hybrid that does 0-60 in 6 seconds and gets 70mpg!
DesignCon 2013 - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: October 27, 2012, 09:25:57 pm
content: I've recieved an email about this conference as well as noticed it on LinkedIn. Is anyone familiar with it? It's a conference on board and chip design. I'm looking to attend, if I can get my company to pay for it, or at least comp my time.http://www.designcon.com/santaclara/

author: EEVblog
author_rank: Unknown
timestamp: October 27, 2012, 09:28:56 pm
content: I've been to DesignCon, but had to man the stand most of the time, so didn't get to any of the lectures.Worth going t if you can get the company to pony up for it!Dave.

author: EEVblog
author_rank: Unknown
timestamp: October 28, 2012, 11:05:02 am
content: They even have a convenient Justification Toolkit!http://www.designcon.com/santaclara/registration/justification-toolkit.phpDave.

author: khadden
author_rank: Newbie
timestamp: November 26, 2012, 08:52:10 pm
content: Hi Dave,I'm on the DesignCon event team and would be happy to offer members of your forum and readers of your blog a 20% discount on conference passes from now until December 31, 2012. If you think this is something they'd be interested in, I can be reached atkate.hadden@ubm.com. Also, if you're interested in attending as Media, I can send you the registration link for a free media pass.Pack34 - feel free to contact me with any questions you may have about the show!Thanks!Kate

author: EEVblog
author_rank: Unknown
timestamp: November 26, 2012, 08:59:06 pm
content: Quote from: khadden on November 26, 2012, 08:52:10 pmThanks Kate, but I'm 15,000km awayDave.
Another Small Util for Rigol DS1000: Rigol Recorder (Vector Movie?) - Page 1
Forum section: electronics / general

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 25, 2012, 07:29:51 pm
content: i need a quick and interactive way of documenting and analyzing my project testing. so i build this to record whats on the scope. later i can play it back, insert some image and diagram notes, and compare with other testing setup. rigrecorder.zip is the app file (tested in WinXP). if you have not installed the externall dll required (those mbmp*.dll stuffs) then its patch.zip. if you still cannot run (COMDLG error) download and run the setup fromhttp://www.soasystem.com/eng/goltek/setup100.zipyou can test the app using sample test file rigol_recorder_test_file.zip (unzip the content). cheers.

author: george graves
author_rank: Super Contributor
timestamp: November 26, 2012, 06:13:28 am
content: Cool stuff. I don't know what I would use this for off hand - but it seems like it could be very useful!
What was this?? seems a multimeter but no ADC... - Page 1
Forum section: electronics / general

author: sorin
author_rank: Frequent Contributor
timestamp: November 25, 2012, 08:31:48 am
content: Seems a multimeter but don't have any ADC just some Operational amplifier and logic circuitSeems to be from GermanyAlso has just 2 terminal, and use a mechanical switch to measure currentSeems to be older than meSorry for the image quality.

author: SeanB
author_rank: Super Contributor
timestamp: November 25, 2012, 09:37:37 am
content: The Intersil cerdip is the ADC unit.

author: sorin
author_rank: Frequent Contributor
timestamp: November 25, 2012, 09:45:20 am
content: all intersil are operational amplifier with pA bais current

author: SeanB
author_rank: Super Contributor
timestamp: November 25, 2012, 09:59:57 am
content: It will be the comparator in the single slope converter, the logic does the counting up and other logic that you would normally get in a single chip unit.

author: ju1ce
author_rank: Regular Contributor
timestamp: November 25, 2012, 11:24:14 am
content: It seems like you don't have strict safesearch on

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 25, 2012, 12:03:53 pm
content: Quote from: ju1ce on November 25, 2012, 11:24:14 amI tried searching for dmm 1809:01 and that result actually comes up regardless of the SafeSearch setting. Well, Dave sometimes calls DMMs pornographic, but that's silly. What's next? "Hot power supply double penetrates sexy DMM, almost blows fuse and yellow rubber off"
Electronics markets in HK and Manila - Page 1
Forum section: electronics / general

author: Emil
author_rank: Regular Contributor
timestamp: November 24, 2012, 06:04:04 pm
content: I'm going to Hong Kong and Manila in january/february and I'm looking for some interesting things to do.Are there any good electronics markets, places to buy/look at test equipment/components in either of these places? I guess there must be some in HK, but I don't know where.. Not so sure about Manila.Others interesting things to see/do in either place?Emil

author: mianchen
author_rank: Regular Contributor
timestamp: November 25, 2012, 12:04:21 pm
content: go to SEG in Shenzhen, it's an hour away from HK. you may need a visa though.

author: peter.mitchell
author_rank: Super Contributor
timestamp: November 25, 2012, 12:34:05 pm
content: yeah, if you get a shopping tour of mainland you get a visa easily, and then you just stray from the tour.

author: Wytnucls
author_rank: Super Contributor
timestamp: November 25, 2012, 06:53:50 pm
content: In Hong Kong, go to Apliu street in Sham Shui Po. Look for WELC. All the good stuff is on the first floor. A bit expensive, but you will find most of what you're looking for there.http://www.weclonline.com/eng/index.asp?G/F & 1/F, Ming Chu Building,201, Apliu Street, Sham Shui Po, Kowloon, Hong Kong

author: T4P
author_rank: Super Contributor
timestamp: November 25, 2012, 08:00:40 pm
content: If you do go over to shenzhen, there's numerous buildings to look for, SEG Market being one of the most prominent but there's one that isn't packed with people over at a train stop known as "Lingzhi" Which is actually Bao'an in ShenzhenOver one of the exits there's a nice hotel and to the left there's a nondescript building which is actually a "electronics tower"

author: Emil
author_rank: Regular Contributor
timestamp: November 27, 2012, 09:51:33 am
content: I didn't plan on going to Shenzhen because I need a visa which is complicated, mostly because I need to go in person to the Chinese embassy which is not close to where I live.I'v been googling it now and it looks like it's possible to get a 5 day visa on the border. Does anyone have experience with this?
Secret military medical service? - Page 1
Forum section: electronics / general

author: ptricks
author_rank: Frequent Contributor
timestamp: November 23, 2012, 05:25:01 pm
content: While browsing for surplus equipment I found this in the medical/dental department:http://www.govliquidation.com/auction/view?auctionId=5815102&convertTo=USDQuoteThe transformers were real and this is what is left after repairsInteresting thing is that the site doesn't determine what category the items will be listed under, that is determined by the FSC the military assigns

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 23, 2012, 07:03:11 pm
content: Well, at least this one makes some sense:

author: bullet308
author_rank: Frequent Contributor
timestamp: November 24, 2012, 05:02:02 am
content: The Government Liquidation/DRMO guys are not always as careful as they ought to be. This mess of an auction is what happens when you have guys that don’t know what they are looking at just say screw it and lump it all together.

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: November 24, 2012, 05:44:43 pm
content: Quote from: bullet308 on November 24, 2012, 05:02:02 amI don't understand the purpose of this thread. The stuff from the link is from 1970's - it is not airworthy and good only for paperweights. Spending time categorising it is just waste of tax money.Leo

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 24, 2012, 06:41:51 pm
content: Quote from: Leo Bodnar on November 24, 2012, 05:44:43 pmKnowing the government they probably have a category for that too

author: djsb
author_rank: Super Contributor
timestamp: November 24, 2012, 11:19:29 pm
content: Is there a UK equivalent to this site?David.

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 24, 2012, 11:32:36 pm
content: Quote from: bullet308 on November 24, 2012, 05:02:02 amThe issue OP is pointing out is not that the items are lumped together, but that the auction is listed under medical/dental equipment. It probably should have been listed under, I don't know, what about aircraft parts...

author: SeanB
author_rank: Super Contributor
timestamp: November 25, 2012, 05:49:52 am
content: They looked at the pile, saw a chair that was not an office chair and said " Ahh, medical chair of some kind" and that was that.

author: bullet308
author_rank: Frequent Contributor
timestamp: November 25, 2012, 09:18:44 pm
content: Quote from: nitro2k01 on November 24, 2012, 11:32:36 pmA different but directly related problem. A general lack of give-a-shit leads to multiple overlapping forms of sloppiness. Unless its something unitary and simple to describe such as a truck, you can get some very screwy auctions some times...okay, a lot of times. .
Charging Li Ion Batts With Lower than Spec Voltages?  - Page 1
Forum section: electronics / general

author: bullet308
author_rank: Frequent Contributor
timestamp: November 23, 2012, 04:00:50 pm
content: Hi: Im working on a project where I have a 4000 mAh lithium ion battery that I am trying to rig a solar trickle charger for. I was planning on using a cheapie USB solar charger intended for cell phone use, but when I wired it up, found that it was only putting out about 1.6v. Normally you charge these batteries at about 4.3v or so. What happens when you pump 1.6v into a 3.7v battery that normally charges at 4.3v? Anything good? Anything particularly bad? If the latter, how does this charger manage to charge cell phones that nominally take 5v in?Once I asked the dean of the local university EE program about how to charge an obscure Russian night vision scope battery. He stroked his greying beard and mumbled something about battery charging being a bit of a dark art...TIA

author: NiHaoMike
author_rank: Super Contributor
timestamp: November 23, 2012, 04:52:00 pm
content: You'll need a boost converter (with MPPT or at least a duty cycle limit) for it to work. Limiting charge voltage to 4.1V (instead of 4.2V) improves the battery lifetime.

author: Flávio V
author_rank: Regular Contributor
timestamp: November 23, 2012, 04:53:13 pm
content: The battery will feed the output of the charger...that means than it will discharge and the circuit might get damaged if the ICs aren't protected...

author: tom66
author_rank: Super Contributor
timestamp: November 23, 2012, 06:04:24 pm
content: If you do manage to charge it to 1.6V, and it stays there for any longer than a few minutes, it will likely be permanently damaged.

author: FenderBender
author_rank: Super Contributor
timestamp: November 25, 2012, 09:14:26 pm
content: If you haven't watched this already...

author: IanB
author_rank: Super Contributor
timestamp: November 25, 2012, 10:04:53 pm
content: Quote from: bullet308 on November 23, 2012, 04:00:50 pmYou can trickle charge a lithium ion battery (in other words, charge it very slowly), but you must respect the voltage limits, and you must not charge it above 4.2 V. Safely charging lithium ion cells or batteriesalwaysrequires electronic charge control between the supply and the battery being charged. You cannot simply connect them to an unregulated power supply, solar or otherwise.QuoteThen the charger appears to be broken. Cell phone chargers need to supply about 5 V so that the charging circuitry inside the phone can regulate it down. Are you putting it in bright enough sunlight?(Note that if you are not charging a phone, you will need to provide your own charge control circuit that otherwise would be provided by the phone.)QuoteYou cannot "pump 1.6 V into a 3.7 V battery". This sentence is physically and grammatically in error.QuoteThe charger doesn't manage to charge any phones if it only generates 1.6 V. It is broken or it never worked.
One for the old computer geek - Page 1
Forum section: electronics / general

author: GeoffS
author_rank: Unknown
timestamp: November 25, 2012, 02:02:27 pm
content: If you were involved with computers in the early 80's (or earlier) then check out this article at The Register:http://www.theregister.co.uk/2012/11/23/test_template/It's a brief history of personal computers as seen through the magazines of the time. I think I've still got an issue or two of Byte magazine in a box somewhere ...

author: SLJ
author_rank: Frequent Contributor
timestamp: November 25, 2012, 02:59:29 pm
content: That stirs some old memories. I started with Micro Cornucopia. I still have a working Ferguson Big Board computer I built in 1980. Takes me awhile to remember with CP/M you had to press "B" to boot it and type in "stat" to see a directory of files.

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: November 25, 2012, 05:29:25 pm
content: If you want easy to digest entertainment of the times watch these:http://www.archive.org/download/http://archive.org/details/computerchroniclesGreat discussions, predictions, cockups and plenty of combovers.I love 80's microcomputers scene but I also have a sweet spot for the mainframes of the time. IBM370, AS/400 etc.LeoQuote from: SLJ on November 25, 2012, 02:59:29 pmQuick review of OSes of the time with Gary Kildall presenting CP/M :http://ia700304.us.archive.org/26/items/Operatin1984/Operatin1984.mpeg
Power cable labelled as 18 gauge, NOT! - Page 1
Forum section: electronics / general

author: Lightages
author_rank: Unknown
timestamp: November 23, 2012, 03:23:16 pm
content: Here in Chile I dragged along a bunch of parts and things from Canada. These included many different power cords with IEC connectors and North American plugs. When I need to have a power cable for something I just cut off the plug and put on a new plug for Chile.I had two of these from different old equipment and needed to make a couple for Chile. They both labelled as 18 gauge. One was as expected, the other not even close. The wire inside maybe is 22 gauge, and it is not even copper! It appears to be multistranded steel and maybe, not sure, copper coated.So the next time you have problems with a piece of equipment that seems to get voltage sags under load, this could be one of the reasons.
Analog Oscilloscope - Page 1
Forum section: electronics / general

author: dramanuj
author_rank: Newbie
timestamp: November 23, 2012, 01:42:10 am
content: Howdy Folks,Looking for a specific analog oscilloscope - NIDA 207 - for use in my training activities. I need a few that are in good working condition. If you have any that you can spare, I would be willing to buy it from you. It needs to be fully functional and ready for use. At a minimum I need both the channels working and the ability to trigger each channel. Thanks for a speedy response. Also, if you possess expertise with fixing this machine, I would love to talk to you. Thanks.

author: notsob
author_rank: Frequent Contributor
timestamp: November 23, 2012, 01:53:04 am
content: I will not bother to respond to your request until you ammend your profile to show which country you are in. Where you live in relation to where another member lives DOES make a huge difference

author: T4P
author_rank: Super Contributor
timestamp: November 23, 2012, 12:17:13 pm
content: No matter where you are i suggest looking away from that scope, because it's really REALLY unbelievably basic. Only goes down to 0.5VAnd this is the wrong section

author: nitro2k01
author_rank: Frequent Contributor
timestamp: November 23, 2012, 02:17:33 pm
content: Quote from: T4P on November 23, 2012, 12:17:13 pmThere's probably some dickhead who wrote a standardized curriculum 20 years ago, requiring that specific model, and no one bothered to review it.Personally, today, I would buy a mixed bag of used, but working analog scopes, then perhaps have students rotate between various scopes between sessions. A little bit less predictable, at the risk of making students have to (shudder) adapt and figure things out.
Higher Temperature Thermocouple For Fluke 87 V - Page 1
Forum section: electronics / general

author: SgtRock
author_rank: Unknown
timestamp: November 30, 2012, 07:33:11 pm
content: Greetings EEVBees:--Where can I get a thermocouple which is compatible with my Fluke 87 V, which will safely measure in a temperature range above the Type K Thermocouple? I want an accurate measurement of the temperature of aluminum slugs for hot extrusion, 350 to 500 °C. Funny thing, I was in my friends extrusion plant the other night when a really big thunder storm took out the power including backup (expensive). Only then did I notice that all the AL slugs ready to be squeezed were glowing a barely perceptible dull, dull, red. In the summer when the temperature is high and the wind does not blow, the heat on the working floor of this extrusion plant is like °50 C. Twenty years ago when I worked there, I had a hourly pattern of, drink 4 liters and pee 2, every hour. Now at age 65 I doubt I could handle it, so part time Millwright Consultant is just my speed."Measure twice. Cut once"Norm Abram 1950 -Best RegardsClear Ether

author: Unknown
author_rank: Unknown
timestamp: November 30, 2012, 10:52:33 pm
content: Type K thermocouples can go much higher, for examplethis probegoes to 600 °C. Other manufacturers also make them, Digikey lists some TPI probes for example.

author: SeanB
author_rank: Super Contributor
timestamp: December 01, 2012, 05:10:06 am
content: Just about any industrial control supplier has thermocouples for high range use. Type K will work up to bright cherry red ( with a short life though) and then you get into others that will not be compatible with the Fluke direct, but will need an interface unit. Have you considered a contactless IR thermopile from Fluke, they are quite accurate at that range, and will have a cal for mill finish Aluminium. The common cheap types do not have emissivity correction, so will read low on bright aluminium. I did a very short video demoing that.

author: saturation
author_rank: Super Contributor
timestamp: December 01, 2012, 02:32:08 pm
content: http://www.ebay.com/itm/K-Type-Thermocouple-Wire-for-Digital-Thermometer-High-Temperature-Sensor-PK1000-/310447148135?pt=LH_DefaultDomain_0&hash=item4848178c67I use these types on my 87V and 1272a, they are accurate compared to my other K probes and IR thermometer, read to their limits. This 1000C is my highest temp limit probe.

author: Unknown
author_rank: Unknown
timestamp: December 01, 2012, 06:22:50 pm
content: Hi, For my electric pottery kiln I use a K-type similar to these; the wire is thicker than the multimeter bundled ones you get and they have little ceramic segments. I take mine up to ~1280'c max. (random seller pic on ebay - search on "kiln thermocouple" )RegardsJules
solder alternative? - Page 1
Forum section: electronics / general

author: JonnyBoats
author_rank: Regular Contributor
timestamp: November 23, 2012, 05:35:44 am
content: OK, this is a real off the wall question:Are there alternatives to solder for mounting a surface mount components to a PCB?What I am thinking of is something like a conductive crazy glue of something similar.My interest would be for quick prototypes, not production work.

author: Dago
author_rank: Frequent Contributor
timestamp: November 23, 2012, 06:48:01 am
content: What are you hoping to achieve with this alternative?Conductive glue (if that would exist in a form that would be useful) would seem just a slower alternative of just using solder paste and an oven. Glue would take much longer to cure than using a reflow oven (3-4 minutes). And you can use a toaster oven/pizza oven as a reflow oven and they cost 50$ max.

author: mr_monster
author_rank: Newbie
timestamp: November 23, 2012, 07:18:18 am
content: Personally I think this is very unpractical... There are commercially available conductive glues, they contain carbon powder and some other spices. Note that they're conductivity is much worse than any kind of solder or wire.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 23, 2012, 08:05:02 am
content: You can get silver based epoxy and inks, which are conductive enough to use as solder substitutes but they are expensive and would only normally be used where solder can't for thermal reasons, e.g. on plastic substrates

author: JonnyBoats
author_rank: Regular Contributor
timestamp: November 23, 2012, 08:31:17 am
content: > What are you hoping to achieve with this alternative?One example would be to add a bypass cap to the back side of an existing board with components already mounted on the front (top) side.I am not looking to replace solder in general, rather I am trying to think about special situations where this would give another option in addition to solder.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 23, 2012, 08:45:38 am
content: Quote from: JonnyBoats on November 23, 2012, 08:31:17 amWhy would you not solder it?For double sided assy you reflow the side with the smallest parts first, turn over and repeat - surface tension stops the parts falling off on the second reflow.
The End of The World Fools  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: November 21, 2012, 11:11:58 pm
content: tremble in fear sell all your things and send your money now (in jesus name of course) to the televangelistsSo, this time next moth we'll get to laugh in face of those end of the world idiots.however could they be statistically right ?You'll have to watch the video to find the answer to that

author: M. András
author_rank: Super Contributor
timestamp: November 22, 2012, 11:17:55 am
content: i just leave this here

author: ciccio
author_rank: Frequent Contributor
timestamp: November 22, 2012, 08:36:11 pm
content: Prof. Cox was in a hurry because the world was ending.This is the reason why he did not stop the car...Best regards

author: Pentium100
author_rank: Frequent Contributor
timestamp: November 22, 2012, 09:33:20 pm
content: Never predict the end of the world - if you are wrong everybody will laugh at you and if you are right you won't be able to brag about it.

author: SLJ
author_rank: Frequent Contributor
timestamp: November 22, 2012, 11:20:54 pm
content: I thought for sure he was going to get hit by a bus at the end of the video...
Tektronix 2432 Scope Probes, Aftermarket or Reduced Bandwidth - Page 1
Forum section: electronics / general

author: beaker353
author_rank: Unknown
timestamp: November 22, 2012, 04:08:34 am
content: I just picked up a used Tektronix 2432 scope for $245 US. I think this is a pretty good deal especially that it's local person selling and I have 14 days to return it if I wish to. Is it as good of a deal as I think it is? The scope comes with manuals and a cover, but no probes. I didn't realize until after I committed to buy the scope the high cost of 300MHz probes. A set of two OEM models cost me more than the scope! I found a online retailer of some non-Tektronix branded probes that seem to be much more reasonable. I know that you generally get what you pay for in test equipment, but is this deal to good to be true (link below)? Secondly, other than reduced bandwidth, is there any problems using scope probes of lower bandwidth? I wouldn't think there would be, but I know enough about electronics to know I don't know enough about electronics... Thanks!http://www.ezprobe.com/probes/TEX300RA.html-EM