hybridfree/eevblog-posts huggingface dataset:
Comical Nigerian electronics repair service. - Page 1
Forum section: electronics / general

author: station240
author_rank: Unknown
timestamp: September 07, 2016, 12:09:24 am
content: http://aghos-electronics.blogspot.com.au/2014/02/repairupgrade-your-inverter.htmlQuoteROFL The "new" inverter is an even bigger mess inside than the old one.Yes they just shoved some circuitry in to replace the original, and reused the case, transformer etc.

author: bitslice
author_rank: Frequent Contributor
timestamp: September 07, 2016, 12:16:51 am
content: Well it is Africa, I'd imagine getting an new inverter is expensive/difficult, and any kind of repair is better than nothing.

author: XOIIO
author_rank: Super Contributor
timestamp: September 07, 2016, 12:17:49 am
content: My god I mean yeah in that country having one working would be great but holy shit there's like, no cable management whatsoeverI sure as shit wouldn't have posted those pictures.

author: Someone
author_rank: Super Contributor
timestamp: September 07, 2016, 12:22:59 am
content: They're doing a good effort to provide appropriate services for their community, and rounding out the electronics with general help in conserving energy. This sort of local support and empowerment is part of building a nation not just relying on foreign imports of products and services.Quote... and lots of twisted pair telecommunications wire in their examples.How about you offer them some help instead of belittling their work?

author: CJay
author_rank: Super Contributor
timestamp: September 07, 2016, 09:05:22 am
content: There's a really nice exhibit in the Science Museum, London which is a mobile phone repair shack they've uplifted from Cameroon, they offered mobile phone calls, battery charging along with computer and phone repair services.Not in any way a clean, tidy, professional working environment but a highly effective and very useful service for a 3rd world country.

author: dannyf
author_rank: Super Contributor
timestamp: September 07, 2016, 10:19:48 am
content: QuoteBut does it work?its only fault is its violation of my "right to repair repairs" law.

author: zapta
author_rank: Super Contributor
timestamp: September 07, 2016, 10:31:16 am
content: If I would live in Nigeria and built that I would be proud.Actually I would be proud building it anywhere in the world.
Product Placement - This thread was made to save another thread going off-topic - Page 1
Forum section: electronics / general

author: MK14
author_rank: Super Contributor
timestamp: September 08, 2016, 01:41:23 pm
content: Product Placement - This thread was made to save another thread going off-topic.Original thread:https://www.eevblog.com/forum/testgear/digital-oscilloscope-as-a-film-prop/

author: MK14
author_rank: Super Contributor
timestamp: September 08, 2016, 01:50:59 pm
content: Quote from: Wuerstchenhund on September 08, 2016, 01:20:31 pmJust because you are living in the UK (presumably because of your forum flag), and know some stuff, does not necessarly mean that everyone else knows about it. I am not that interested in exactly how the BBC works, so you could easily know stuff, that I don't about it.I did not realize that other countries had organizations, similar to the BBC. If asked before reading your response, I would have probably said I'm unsure.
Possible bug? Forum doesn't mark topics as read when you open them in a new tab? - Page 1
Forum section: electronics / general

author: XOIIO
author_rank: Super Contributor
timestamp: September 05, 2016, 06:27:47 am
content: So this is something I noticed when I first started using the forum actually but took a hiatus and forgot, the forum doesn't mark topics as read when you open them in a new tab, I'm wondering if anyone else has this issue. I'm using Firefox.It also seems to not always mark threads as read even if you just click on them, possibly due to having other topics open in tabs, not sure.It's minor but I figure I'd see.

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 05, 2016, 08:53:15 am
content: I can't make it fail, not in IE, Chrome or Firefox. Even when you copy the link to another browser and then refresh the unread page the topic is gone as it should be.

author: JPortici
author_rank: Super Contributor
timestamp: September 05, 2016, 10:20:37 am
content: firefox here.. working as usual.

author: MosherIV
author_rank: Super Contributor
timestamp: September 05, 2016, 11:00:57 am
content: HiI did see the bug in the last couple of weeks but now it is not doing it.

author: SeanB
author_rank: Super Contributor
timestamp: September 05, 2016, 05:51:42 pm
content: Only there if you were a page or more behind and opened the page in a new page. a few refreshes ( or press the all option) and it will be up to date.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 05, 2016, 06:10:24 pm
content: I open new tabs all the time, but it still works. I think you have to read a topic for a little while before the "mark as read" goes through. Popping in and out of a thread, very quickly, often leaves it unmarked.Tim
Youtube ad friendly videos? - Page 1
Forum section: electronics / general

author: firewalker
author_rank: Super Contributor
timestamp: September 04, 2016, 11:31:21 pm
content: WTF!https://www.theguardian.com/media/2016/sep/02/youtube-video-ads-youtubers-advertiser-friendlyI saw it in a NurdRage's video:Alexander.

author: station240
author_rank: Unknown
timestamp: September 05, 2016, 01:16:15 am
content: An example, original video was titled "Weed OS: The Mediocre HIGH"As explained in the comments, "There are apparently consequences to having too much weed related stuff on any particular video.... I'm now learning this.?" eg no ad revenue.

author: rsjsouza
author_rank: Super Contributor
timestamp: September 05, 2016, 02:21:29 am
content: I heard about this on the commentary video below:https://youtu.be/DqFf-UCRJm8

author: crispy_tofu
author_rank: Super Contributor
timestamp: September 05, 2016, 06:15:50 am
content: Funnily enough, I heard about this from a Louis Rossmann video:
How do I unbind a nano drone? - Page 1
Forum section: electronics / general

author: VinzC
author_rank: Frequent Contributor
timestamp: September 04, 2016, 02:09:33 pm
content: Hi all.I recently bought two nano drones at Hamley's in London: Hamley's Nano drone:When I got home (different country, of course...) I accidentally bound the second drone to the other remote instead of its own while testing them. Now I'm stuck and I can only drive both drones using one remote. Is there a way to unbind those drones from their remote?Thanks in advance for any hint or suggestion.

author: Halcyon
author_rank: Unknown
timestamp: September 04, 2016, 03:10:32 pm
content: Just repeat the process with the other remote that currently doesn't do anything??

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 04, 2016, 03:19:26 pm
content: Disconnect the drone batteries.

author: VinzC
author_rank: Frequent Contributor
timestamp: September 04, 2016, 09:03:12 pm
content: Quote from: Halcyon on September 04, 2016, 03:10:32 pmNope, doesn't.Quote from: Cyberdragon on September 04, 2016, 03:19:26 pmI didn't think of that! I removed the remote batteries though. Will try this and report.
Net induction effect of wrapping power cord around EMT conduit - Page 1
Forum section: electronics / general

author: Back2Volts
author_rank: Unknown
timestamp: September 03, 2016, 03:05:54 pm
content: I think it should be zero. The effect caused by the current in the live wire should be negated by return current in the neutral.This question came to my mind because I am trying to tidy up the power cords in my bench and I thought of a solution consisting in setting up a piece of EMT conduit under the table, on a couple of wood blocks to leave some space to run the plugs through. Then wind a few loose passes of a given cable to store the exceeds length. There would be many cables... I know I could use a wooden dowel but I have EMT on hand.Any thoughts, alternative solutions ? What do people do with the mess of cables ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 03, 2016, 07:21:07 pm
content: I would tie them off with cable ties, first to themselves, taking up the excess slack of each cable in loops, folded over on itself. Then to each other, preferably in a rack sort of arrangement where you can get at any one cable relatively easily, rather than having to dig through a messy bundle.Tim

author: Back2Volts
author_rank: Unknown
timestamp: September 03, 2016, 11:30:07 pm
content: That is the setup I have on my other desk. It does work, but I find is a bit of a pain when having to take a device away for some temporary reason. I am trying to come up with something better, but may end with some strapping. I am probably overthinking this.

author: SeanB
author_rank: Super Contributor
timestamp: September 04, 2016, 08:07:45 am
content: Plastic conduit and low current no problems. You run into issues with a large number of turns and with high current with any coil of cable, and with metal you also have issues with local eddy currents from the non perfect twisted pair construction of the cords.But for low current all you make is a very poor common mode choke inductor, which does at least reduce radiated EMI somewhat, and which might provide a little more reduction of power line noise, though it does increase impedance of the mains earth line slightly.
Can't post iPad photo on forum - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: September 03, 2016, 11:34:35 pm
content: Went to post a pic and got back this message.Edit -> I am aware of the irony of posting a pic regarding not being able to post a pic.

author: Circlotron
author_rank: Super Contributor
timestamp: September 03, 2016, 11:37:11 pm
content: Okay... It seems that I can post a full frame .jpg picture but when I cropped it I cannot post the resulting .jpeg picture. Dunno if other editing also produces a .jpeg from the original .jpgUsing an iPad Air.

author: mtdoc
author_rank: Super Contributor
timestamp: September 03, 2016, 11:45:59 pm
content: I just send it to another app such as FileApp or DropBox that lets you change the file extension to .jpg

author: Richard Crowley
author_rank: Super Contributor
timestamp: September 04, 2016, 12:08:03 am
content: Did you try simply re-naming it whatever.jpg?The forum software likely uses a dumb filter based simply on the file extention and doesn't even know anything about the actual content.

author: amyk
author_rank: Super Contributor
timestamp: September 04, 2016, 01:41:31 am
content: As far as I know, JPG is the standard extension for JPEG files. Apple are being problematic as usual with their "Think Different".
Techmoan's latest hi-fi video... - Page 1
Forum section: electronics / general

author: strangersound
author_rank: Regular Contributor
timestamp: September 03, 2016, 08:33:48 pm
content: So, Techmoan acquired a SAE MK6 vintage tuner (audiophile) and not only does it have nixie tubes for the tuner display, it also has a built in scope display. This thing is pretty, no doubt about it. Fans of vintage silver face components from the 70's have probably deemed this thing a legend for a long time. But just as soon as you think it can't get any cooler, he opens it up for a look inside. EE porn of the highest caliber. If you're not into audiophile gear, the inside look starts at 11:50.

author: Ampera
author_rank: Super Contributor
timestamp: September 03, 2016, 08:38:39 pm
content: Techmoan is a pretty cool guy, although he sometimes makes me want to make a new head shaped hole in my desk whenever he encouters a simple problem. He does a load of interesting stuff.

author: dannyf
author_rank: Super Contributor
timestamp: September 04, 2016, 12:17:23 am
content: I share his love for silver metallic plates + big meters. I never understood what drove the transition from silver to black, on electronics as well as cameras of the same era. There is a little bit of going retro now in that department, however.The scope is a gimmick to me. funny that how little true "audio" circuits there are in that thing.

author: helius
author_rank: Super Contributor
timestamp: September 04, 2016, 01:52:26 am
content: Professional photographers actually preferred black cameras because they werelessflashy, so drew less attention. They often taped over the logo, as well.The trend to black painted Hi-Fi equipment was part of a fashion for minimalist designs. '80s yuppies liked to believe that understatement equaled sophistication. And if that meant a weird black control that's labeled in black on a black background, turning on a small black light that lights up black, all the better.

author: jh15
author_rank: Frequent Contributor
timestamp: September 04, 2016, 04:01:56 am
content: I repaired (yes, that used to happen) high end (pre audiophool) stuff. I had to test out and tweak components to my satisfaction before returning to customers.I loved the Marantz tuner with the scope because I had just bought the new Sound Technology equipment I still have.I think the WBCN indie rock station transmitter chain could have put out dc.In that turntable (and on the mic) era, I could see subsonic studio HVAC stuff on that scope from the LPs.BTW, any amplitude modulation in the flat trace shown in his video is multipath.As we speak, I'm upgrading the tuner reception antennas for a hifi non-profit FM station EAS system using a 70's Kenwood tuner with scope output and multipath ports.I participated in the best hifi in the 70's. Before CDs, transmitting from a Studer Dolby A 30 IPS machine, tapes through a 100KW FM RCA transmitter on a large hill near Boston on Tuesday evenings.The compressors and limiters were bypassed, the Studer plugged directly into the Xmitter.Some FCC pink tickets were generated at times, but a good tuner would take it.
Robot Designed to Test NASA's Pre-Apollo Spacesuits Heads to Auction - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 03, 2016, 12:58:31 am
content: http://www.space.com/33960-nasa-apollo-spacesuit-robot-auction.html

author: Tomorokoshi
author_rank: Super Contributor
timestamp: September 03, 2016, 06:05:02 am
content: Perhaps there is a red arm somewhere that could be fitted to it.Someone with a lot of time and money could adapt a modern control system to it and make it do something useful.

author: Ampera
author_rank: Super Contributor
timestamp: September 03, 2016, 06:51:15 am
content: Most amazing thing I have ever seen. Sorta looks like a knight in armour.Honestly it would make a good coat rack, but I don't wanna be the guy digging through 40-50 year old hydraulics and rubber. That would not end well.

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 03, 2016, 05:24:01 pm
content: If only I had the money I could have my own terminator!Just need to build a replacement arm.EDIT:Quote from: TwoOfFive on September 03, 2016, 06:51:15 amWUSS! Some of us dig through 70 year old machinery!
So, why no six-layer aggregation service? - Page 1
Forum section: electronics / general

author: JoeN
author_rank: Frequent Contributor
timestamp: September 03, 2016, 07:12:20 am
content: Now that would be interesting. Is there no way OSHPark can talk their manufacturer into doing a six layer board every two or three weeks for them? I have to assume a 6 layer board isn't all that much more complex than a 4 layer board, just another FR4 sheet but no more work in terms of drill, mask, or silk. There has to be someone who would do that and for a big service like OSHPark they could probably fill a board more than once a week. The two layer stuff they fill a board several times a day anymore it seems like (from how fast I get messages that I have been sent to fab once I submit something).

author: janekm
author_rank: Unknown
timestamp: September 03, 2016, 09:15:25 am
content: Well, the major Chinese prototype PCB services do offer 6 layers and up. Nominal price for a 5x5cm board with basic specs would be starting at 500RMB (around $75) for 10 pieces with 6 layers. Which is around double what OSHpark charge for a 4-layer PCB that size so it's in the ballpark (the same factory's price for 4 layers is 250RMB).I suspect the market for low-cost 6-layer PCBs isn't quite as huge as you think... hobbyists in my experience start designing 2-layer boards then move up to 4 layers if that won't suffice for some reason (complexity of routing, ground / power plane requirements), it's rare to need to move up to 6 layers for Arduino-like levels of complexity.

author: JoeN
author_rank: Frequent Contributor
timestamp: September 03, 2016, 09:26:00 am
content: I just want it from OSHPark because I know they vet their manufacturer(s) and the quality is top notch and in the US the turnaround times are excellent. I don't see any reason to send it to China unless you are making some sort of huge board where the quality doesn't matter much (LED panels??). I bet they can make this work from the sales side, they just have to find a manufacturer that will do it. BGA parts and the number of components that are now appearing in BGA packages only is what make me think that this service would actually sell.

author: rob77
author_rank: Super Contributor
timestamp: September 03, 2016, 09:38:18 am
content: i think it wouldn't sell that well. a pool service for 6 layers would have way too long turnaround times because they would have to wait ages to fill up a panel. most hobbyists avoid BGA and anything smaller than 0603 and most hobbyists don't even have software for 6 layer routing.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 03, 2016, 09:47:45 am
content: I'm sure it's simply a case of lack of demand. I've done a few thousand PCBs over the years and only once needed 6LEurocircuits offer up to 16L but pricing suggests >=6L isn't pooled.Also as you get to higher layer counts you also have more potential variation in the process like blind/buried vias, controlled impedance etc.
Vintage audiophoolery: SAE Mk6 FM Tuner - Page 1
Forum section: electronics / general

author: Muxr
author_rank: Super Contributor
timestamp: September 01, 2016, 07:15:52 pm
content: What can be better than an integrated XY mode CRO and Nixie tubes?There is a teardown towards the end of the video.. pretty nice unit for 1971.

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 02, 2016, 02:31:30 am
content: I have a marantz 2110. Got it for something like $45 at a flea market.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 03, 2016, 12:48:47 am
content: This isn't audiophoolery.

author: Jwalling
author_rank: Unknown
timestamp: September 03, 2016, 02:01:27 am
content: Quote from: Alex Eisenhut on September 03, 2016, 12:48:47 amIndeed. I'd love to have that stereo!EDIT: Err. Tuner. Very cool!

author: edavid
author_rank: Super Contributor
timestamp: September 03, 2016, 02:13:05 am
content: Quote from: Alex Eisenhut on September 03, 2016, 12:48:47 amWouldn't spending $1250 on an FM tuner in 1974 count as audiophoolery?

author: retrolefty
author_rank: Super Contributor
timestamp: September 03, 2016, 02:17:12 am
content: I too have a collection of hi-end stereo equipment from the 70s and that was a 'golden era' of such equipment.

author: cvanc
author_rank: Frequent Contributor
timestamp: September 03, 2016, 02:28:47 am
content: That tuner is sexy as hell.So this is the only piece of hifi gear that has both a scope and Nixie tubes? Interesting. A million years ago I had a Marantz tuner (Model 120 maybe?) that had a scope. Fun to play with.

author: vk3yedotcom
author_rank: Frequent Contributor
timestamp: September 03, 2016, 02:30:37 am
content: Quote from: edavid on September 03, 2016, 02:13:05 amDepends on the motivation for buying it.Audiophools, to my mind, are people who spend megabucks on gear and accessories that by any objective test is poor or makes no improvement.One can still spend a lot of money on old gear and make no claims of its superiority.Instead the motivation for buying may be due to rarity or technical curiousity (eg all the 'orphan format' tape players he collects and reviews).

author: rdl
author_rank: Super Contributor
timestamp: September 03, 2016, 02:59:25 am
content: I have a Fisher Studio Standard RS-1020 from that era and its beautiful.

author: Muxr
author_rank: Super Contributor
timestamp: September 03, 2016, 03:29:56 am
content: Quote from: Alex Eisenhut on September 03, 2016, 12:48:47 amVintage Audiophoolery. Would you spend $6K on this thing in today's dollars?I do agree however this thing is nice which is what I said in my original post.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 03, 2016, 04:02:09 am
content: I don't see the audiophoolery, vintage or not.
Australian wedding present gift etiquette? In other words how much money to give - Page 1
Forum section: electronics / general

author: Towger
author_rank: Super Contributor
timestamp: September 02, 2016, 01:34:15 pm
content: I have a brother getting married to a Sheila soon and we are all invited. This leaves me with the problem of what to give the married couple to be as a gift. The wedding invitation mentions something called a 'wishing well', which I have been told decodes to 'We want money'.So to the crux of the matter, how much should I give?Taking into account:A) I am a tight arse.B) I am transporting SWMBO, three little ones and myself halfway around the world to attend the wedding.C) He has no interest in electronics.Awaiting your replies,Towger.

author: alanb
author_rank: Frequent Contributor
timestamp: September 02, 2016, 02:15:12 pm
content: I have two suggestions:-1 - Ask your brother what they have been receiving from other people and use this as a guide. You should explain however that due to the cost of transporting the family any gift from you will be at the lower end of the range.2 - Contact a store that does wedding lists in the town that the wedding is going to be in and ask them how much is spent on typical gifts.

author: DTJ
author_rank: Super Contributor
timestamp: September 02, 2016, 02:21:54 pm
content: Quote from: Towger on September 02, 2016, 01:34:15 pmI think the going rate equates to the reception cost, so maybe $150 - $200 per couple.I may be well out of code with this info.

author: Towger
author_rank: Super Contributor
timestamp: September 02, 2016, 02:45:54 pm
content: I initially thought they wold have a wedding list from a local department store etc, but the wedding invite has this Wishing Well thing. They have been shacked up together for years, so already have a house and all that entails.My sister thinks €200 which is $300 at current exchange rates. I think the going rate is here is €150, if they are just friends. Of course that does not take into account the cost of attending. I think the reception is in a fancy enough place and we are staying there a couple of nights, must ask if he is paying for that

author: EEVblog
author_rank: Unknown
timestamp: September 02, 2016, 03:09:09 pm
content: Quote from: DTJ on September 02, 2016, 02:21:54 pmYep, that's how it usually works.Fond memories of a wedding were I was tasked with taking care of the cash. Standing in the middle of the street in a dodgy neighborhood at 1am in the morning with 10's of thousands of dollars in cash and whipping out the wad to give the groom some honeymoon cash. Someone I and the money made it home...

author: Towger
author_rank: Super Contributor
timestamp: September 02, 2016, 07:32:06 pm
content: Quote from: EEVblog on September 02, 2016, 03:09:09 pmSounds like a money making venture!

author: Cerebus
author_rank: Super Contributor
timestamp: September 02, 2016, 07:58:13 pm
content: Quote from: EEVblog on September 02, 2016, 03:09:09 pmThat's what you get for being the one man at the wedding who's guaranteed to be stone cold sober - forced responsibility.
NASA SPOC (Grid Compass) Computer Used for Space Shuttle STS-51-I Mission - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: September 02, 2016, 02:12:42 am
content: On eBay.http://www.ebay.com/itm/191945867927?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

author: JoeN
author_rank: Frequent Contributor
timestamp: September 02, 2016, 06:38:43 am
content: Let's all chip in!

author: XOIIO
author_rank: Super Contributor
timestamp: September 02, 2016, 07:23:27 am
content: Holy shit that's awesome. He's asking a shitload more because it was in a mission though, I wonder if it will sell.Also, isn't it technically NASA property? lol

author: jonwil
author_rank: Contributor
timestamp: September 02, 2016, 08:06:40 am
content: Dave got a navigation compass from a Boeing B-52 Stratofortress bomber and it isn't unheard of for parts NASA no longer needs or uses to get sold off as surplus in much the same way.

author: XOIIO
author_rank: Super Contributor
timestamp: September 02, 2016, 08:16:39 am
content: Quote from: jonwil on September 02, 2016, 08:06:40 amOh man what I would give for some old aviation stuff, especially stuff with radium dials/paint, in the prairies in Canada though there's basically nothing :/ I'd love to go to that aviation junkyard they go to on mythbusters.

author: JoeN
author_rank: Frequent Contributor
timestamp: September 02, 2016, 08:28:13 am
content: Quote from: XOIIO on September 02, 2016, 07:23:27 amIs or was. Assuming it was disposed of properly (like at auction), it's legit. The government sells equipment all the time. Dave has shown off some real interesting kit he got from his government at auction. You should see some of the stuff ours sells off. We still sell off old M1 Garand rifles if you are an American and want one. Some people consider those assault rifles.If it was stolen and worth something the government will go after it forever. They were prosecuting a case of a few (very rare) gold coins that were stolen back in the 1930s until recently, those coins had only recently surfaced and the government knew perfectly well they were stolen.

author: Cyberdragon
author_rank: Super Contributor
timestamp: September 02, 2016, 03:19:17 pm
content: It's the same principal as getting military surplus, it was junked so it's public property.I've seen radium dial instruments at flea markets an auction before. Never bought any though.
YouTube Monetisation Drama - Page 1
Forum section: electronics / general

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: September 02, 2016, 09:30:52 am
content: Surprised it's not mentioned already, but this could arguably be a follow-on from Dave's #911 issue.These are NSFW.

author: R005T3r
author_rank: Frequent Contributor
timestamp: September 02, 2016, 10:09:20 am
content: So, they want to not to pay you for the stuff you produced, even if it's more than a 1 million wiewers on that video? And all of this is because of it's contnent? This is stupid enought for me... Time to move from youtube...

author: EEVblog
author_rank: Unknown
timestamp: September 02, 2016, 10:13:39 am
content: Another dumb-arse move from youtubeIt will of course backfire on them and they will eventually back down in 6 months time just like all their previous stupid changes.Yes a couple of my recent uploads were caught up in this, but now existing content except it seems my live shows which I think were monestised but are now not (I got no email).I'm glad the majority of my income doesn't come from Adsense.If you think this a really dick move then do your part by supporting your favorite Youtubers directly on Patreon, buy merch, or whatever some other scheme they use.
Will you call that ENIG? - Page 1
Forum section: electronics / general

author: blueskull
author_rank: Unknown
timestamp: September 02, 2016, 03:54:00 am
content: Attached are 4 (supposed to be) "ENIG" copper blocks used as demonstration target of a kit of Nanofoil.Seriously, Indium Corp. really wanted to skimp on ENIG cost? The kit of 10 bloody 1'' square 40um Nanofoil sheets costed me $193.5 plus shipping.Keep in mind that one set is shiny, while the other set is dull, which means poor inventory management as well as the electroplating is not made of any noble metal.The Nanofoil themselves, not shown in the pictures, are cut very roughly, definitely does not look like something comes from such an industrial leader.They look like being cut with glass cutter by a pair of shaky hand. FFS using a carbide scriber/cutter I can cut even better than this.I'll link the product page below:http://buy.solder.com/NanoFoil-Activation-Kit-Tin-Plated/P1111_1019/

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 02, 2016, 05:14:17 am
content: So... did they work? Because those don't look very solderable, and if it works, that's kind of neat, I guess...If not, it would be rather "duh" of them to ship something that doesn't actuallywork.Tim

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 02, 2016, 05:37:38 am
content: Indeed.Have to wonder about the reliability of a bonding agent that has to be cut with a carbide scribe, too...On the other hand, maybe e.g. QFP joints will crack at the pin, not the solder...The stuff looks to be Ni-Al, I suppose as an unreacted nano-powder composite that reacts to form the Ni-Al intermetallic. FYI, it's extremely brittle, so don't expect miracles once the stuff has been lit off. Au-Sn is surely the least of your worries in such a joint.The Al presence might also be a chemical corrosion concern. Not sure if it will be passivated (by aluminum or nickel; both have their advantages, alone, in that regard), or make one hell of a galvanic couple. Definitely keep away from acid and base, though.Tim
Help me out with this equation from Signals and Systems lecture - Page 1
Forum section: electronics / general

author: MrOmnos
author_rank: Frequent Contributor
timestamp: August 31, 2016, 10:22:54 am
content: So here in picture ejwktis the input to the LTI system and h(t) is the impulse response. So, by convolution integral shouldn't the response be h(t-T)ejwkTdT? but here it is h(T)ejwkt-TdT. What am I missing here?

author: Kremmen
author_rank: Super Contributor
timestamp: August 31, 2016, 12:49:06 pm
content: Offhand, isn't the system transfer function(not the impulse response) h(T) so when you convolve it with the input, it will produce a time displacement (t-T)?

author: whollender
author_rank: Regular Contributor
timestamp: August 31, 2016, 04:32:13 pm
content: Had to double check on Wikipedia, but, yes, convolution is commutative, so (f * g) = (g * f).

author: diegoperez
author_rank: Contributor
timestamp: August 31, 2016, 09:40:06 pm
content: AFAIK This is a proof of the following statement:"complex exponential signals (e^c t) are eigenvectors of LTI systems"or in other wordsif a complex exponential signal is applied to a LTI system, its output is the same input signal multiplied by a constant (so called eigenvalue, which is equal to the value of the fourier transfer function of the LTI evaluated at the frequency of the complex signal).- Therefore, in the picture the first line simply calculates the output of the system as the convolution of the input signal with the impulse response of the system.- The second line shows that the output signal is the complex exponential (the input signal) multiplied by the value of the fourier transfer function of the LTI evaluated at the frequency of the complex signal (the previously so called eigenvalue).I think my explanation may seem a little more complicated than necessary, feel free to ask any questions.

author: MrOmnos
author_rank: Frequent Contributor
timestamp: September 02, 2016, 01:24:20 pm
content: Quote from: diegoperez on August 31, 2016, 09:40:06 pmI thanks for the explanation. I understand every bit of it. I was confused why the input signal was delayed when every example I had seen so far the impulse response was being delayed. So, it clicked me that when convoluting you can either move impulse over the input or move the input over the impulse.
Ants in your.......? - Page 1
Forum section: electronics / general

author: lowimpedance
author_rank: Super Contributor
timestamp: August 31, 2016, 12:17:03 pm
content: Well in my case ants in my solar garden lights !!. Had a dim solar light and thought it was some moisture ingress from recent heavy rain affecting the battery but no it was a full on ant nursery.See pic. I wonder what the impedance across the blob of pupae was ?. Must admit getting the multimeter out did not cross the mind at that point, (shame on me).Currently cool-ish weather but this would be a very toasty environment come summer.And this is not the first time either. Around last Christmas the sensor light on the garage started tripping the RCD, so up a ladder to the light at 3 meters up, removed the globe to look for corrosion etc and was promptly covered in ants.The sensor was a complete write off but for the solar light it was left open on the front steps and the little buggers got the hint and packed up shop and were completely gone the next day with no sign they were ever there.Bl@@dy ants....... if its not my light fittings its the kitchen !.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 31, 2016, 12:55:19 pm
content: Quote from: blueskull on August 31, 2016, 12:45:43 pmplenty of them critters too but many many more ants.

author: Cyberdragon
author_rank: Super Contributor
timestamp: August 31, 2016, 11:39:33 pm
content: Solar lights and sprinkler timers/valves. And in the brick cracks (then into the house).EDIT: you have mercy. I deploy bug spray, even on PCBs
Sinewave squared (multiplied by itself) - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: August 31, 2016, 10:57:48 am
content: So we put a sinewave into both inputs of a four quadrant multiplier and out the other side comes another sinewave at twice the frequency, and offset so that it swings from zero to X volts, not equally either side of zero like the input waveform. Then we put the output through a cap to centre the waveform on zero, and (maybe) through a hi Q tuned circuit to reduce any slight amount of distortion. Then we put this double frequency sinewave through another multiplier so it is now 4X the original frequency, and so on and so on... What interesting property is there about a sinewave that allows us to do this?

author: dannyf
author_rank: Super Contributor
timestamp: August 31, 2016, 11:01:10 am
content: Trigonometry.

author: DmitryL
author_rank: Regular Contributor
timestamp: August 31, 2016, 11:09:07 am
content: Quote from: Circlotron on August 31, 2016, 10:57:48 amAll sinewave properties can be easily deducted from definition:e^ix = cos(x) + i*sin(x)

author: rstofer
author_rank: Super Contributor
timestamp: August 31, 2016, 04:37:36 pm
content: sin(w)^2 = (1 - cos(2w)) / 2http://www.sosmath.com/trig/Trig5/trig5/trig5.html

author: SeanB
author_rank: Super Contributor
timestamp: August 31, 2016, 07:25:47 pm
content: The offset comes from the non zero constants in the multiplier, you can use an offset compensating DC current to get them to zero, but it will always be there as a temperature and time dependant drift. You tend to forget those constants in Math, but in any multiplication and such those are always there and implied, even if you rarely write them down. Whatever plus c........

author: Circlotron
author_rank: Super Contributor
timestamp: August 31, 2016, 10:02:36 pm
content: Quote from: SeanB on August 31, 2016, 07:25:47 pmThe idea was that both multiplier inputs received the same identical signal, the product of which is only positive or zero. If there was an instant where one input was pos and the other neg then that would make the output swing neg, but yeah, I see what you are saying.

author: dannyf
author_rank: Super Contributor
timestamp: August 31, 2016, 10:15:35 pm
content: Any signal will have a non negative average if it is squared.That's by definition.
fluke 179 spare part, horror. - Page 1
Forum section: electronics / general

author: gowniak13
author_rank: Newbie
timestamp: August 31, 2016, 02:45:59 pm
content: Hello,long time ago i bought a second hand fluke 179, it was cheap, stinking, all in grease, with pernament marker marks. after some time of usage i thought - why not to clean it, my brilliant mind said lets use white spirit, it will take everything off. and it did, window/lens tootried to order spare part nr 648714 at uk technical support, ofc they told me to fuck off i dont have an account with them, so they send me to a local distributor which told i need to wait 4 weeks, i need to order min 35 GBP request so they can proceed it, and if its less than 35 GBP, they charge 35 GBP for themselves.this spare part cost 5GBP....... any advice? help ?or shall i cut a lens from plexiglass by myself?thanks !

author: CJay
author_rank: Super Contributor
timestamp: August 31, 2016, 02:59:29 pm
content: Find a calibration laboratory and ask them nicely if they can order one?Perhaps a second hand equipment dealer can order one for you...

author: retiredcaps
author_rank: Super Contributor
timestamp: August 31, 2016, 05:01:52 pm
content: Modemhead's blog has some ideas about polishing the lens with a real world example.http://mrmodemhead.com/blog/dirty-multimeter-clean-up/http://mrmodemhead.com/blog/gallery/uni-t-ut70b-dmm/With the UT70B, you can see the before and after pictures.

author: ModemHead
author_rank: Frequent Contributor
timestamp: September 01, 2016, 12:56:06 am
content: For badly damaged lenses, I wholeheartedly recommendMeguiar's Headlight restoration kit. It has the super-fine grit sanding pads and plastic polish included, and it's easy to obtain at the local auto parts store. Thanks to LDSishere over at badcaps.net for telling me about it.

author: calexanian
author_rank: Super Contributor
timestamp: September 01, 2016, 05:07:06 am
content: How about this?http://www.ebay.com/itm/U-S-A-FLUKE-77-III-77IV-175-177-179-Lens-Screen-Window-OEM-NEW-/252395969071?hash=item3ac3f8da2f:g:aWIAAOSw9k5XPhoN

author: retiredcaps
author_rank: Super Contributor
timestamp: September 01, 2016, 05:12:07 am
content: Quote from: calexanian on September 01, 2016, 05:07:06 amShipping from USA to United Kingdom is $19.07 USD according to ebay calculator.

author: rsjsouza
author_rank: Super Contributor
timestamp: September 01, 2016, 10:36:11 am
content: Can you order a couple of spare fuses or leads with the order? I am pretty sure these will mount up to 35GBP pretty quickly...Quote from: retiredcaps on September 01, 2016, 05:12:07 amStill cheaper than 35GBP... But with a lot more risk.
Australia - First Wi-Fi box ever - Page 1
Forum section: electronics / general

author: TerraHertz
author_rank: Super Contributor
timestamp: September 01, 2016, 01:05:19 am
content: http://www.theregister.co.uk/2016/08/03/first_wifi_box_ieveri_chosen_as_australias_best_contribution_to_global_history/First Wi-Fi box ever is chosen as Australia's best contribution to global historyHistory of the World in 100 Objects show gains 101st artefactI wonder if anyone can tell us what the various bits of gear are?Also I wonder what the software shown running on the laptops is/was?

author: SL4P
author_rank: Super Contributor
timestamp: September 01, 2016, 02:53:02 am
content: Following the coax cables - I'd guess the items from top to bottom :-LaptopRadio (Rx/Tx) transceiver (no idea of brand* or band)Ethernet Modulator . Demodulator to baseband (no idea of brand* or band)Probably a Eurocard frame with custom in-house cards for the modulation scheme and frequencies they required. The blue circular logo in top LH corner of each chassis may give a clue !!https://www.google.com.au/search?q=CSIRO+logo&espv=2&biw=1153&bih=712&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiS2fDElO3OAhVBk5QKHfB-CoEQ_AUIBigB

author: helius
author_rank: Super Contributor
timestamp: September 01, 2016, 03:35:25 am
content: What, not ANZAC crackers or Crocodile Dundee?

author: EEVblog
author_rank: Unknown
timestamp: September 01, 2016, 03:52:23 am
content: Hmm, I wonder where that gear is now? Somewhere at the CSIRO?I'm thinking video...

author: SL4P
author_rank: Super Contributor
timestamp: September 01, 2016, 03:54:41 am
content: Quote from: EEVblog on September 01, 2016, 03:52:23 amAs the 'first' wifi link, I'd hope it's in a tech museum somewhere... but Australia aren't very good at things like that.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: September 01, 2016, 04:56:35 am
content: The silver laptop looks like a Dell D610. The black one is also a Dell, but I don't know which model.The spectrum analyzer is a Hewlett Packard of the 8560 or similar series.
Bletchley Park - Page 1
Forum section: electronics / general

author: Napalm
author_rank: Contributor
timestamp: September 02, 2016, 11:22:23 am
content: I recently went toBletchley Parkto see the home of the code breakers of WWII. Beautiful place to visit and learn what really happened during that period in history. They have a really nice museum and all sorts. Definitely worth going to see if your visiting the UK.Anyway, I got a few pictures of the inside of their reconstruction of the BOMBE (the actual electro-mechanical code breaking machine). Thought the forum might appreciate a look see.Here's a video of it in action. (Not mine, found it online)I couldn't upload all the photo's to the forum. So here's a album link so you get get the higher quality ones.https://goo.gl/photos/19cuhyFkZsCFj54g8

author: tggzzz
author_rank: Super Contributor
timestamp: September 02, 2016, 11:32:20 am
content: Don't forget that right next door there is the world’s largest collection ofworkingpre-1970 computers, including the world's oldest working computer. And what's far more important is that the staff thereactually knowabout the exhibitsin detail.When I went I started discussing the first computer I used, an Elliott 803. The person I was talking to then whipped out theoriginal circuit diagramsfor an even deeper discussion. There's also a large collection of magazines you can read.I don't know any other museum where that would - or even could - happen.http://www.tnmoc.org/doesn't get any lottery funding, so is well worth supporting.Highly recommended.

author: MosherIV
author_rank: Super Contributor
timestamp: September 02, 2016, 11:46:57 am
content: Thanks tggzzz, we try our bestThe Bletchley Park side can be seen in 1 day. If you are into computing, TNMOC can take 2 days to see and do everything.The best day to come and see TNMOC is Sat because that is the busiest day for volunteers to be in doing restoration/repairs.
Saw this creepy device on our local auction site - Page 1
Forum section: electronics / general

author: apelly
author_rank: Unknown
timestamp: September 01, 2016, 05:59:04 am
content: It appears to be a device for creating RF burns. Presumably for use in some kind of medical research.http://www.trademe.co.nz/1153598386

author: mtdoc
author_rank: Super Contributor
timestamp: September 01, 2016, 06:06:13 am
content: Probably used for doing RF lesions in specific areas of the brains of rats, etc for neurobiology research. Afraid to say I did some of that back in my undergraduate and grad school days. The rats were sedated but as a friend of mine at the time used to say: "If god's a rat, I'm going to hell".

author: sleemanj
author_rank: Super Contributor
timestamp: September 01, 2016, 06:09:38 am
content: Interestingly a quick google reveals that this type of device is used for creating lesions with the intent of actually treating chronic pain. I couldn't easily find a laymans explanation of why, I can only guess that by literally frying specific nerve endings, the pain is lessened long term.

author: helius
author_rank: Super Contributor
timestamp: September 01, 2016, 06:12:22 am
content: Cauterization is also used in clinical medicine, for pain control. This device emits power at 1 MHz.The target temperature range is around 50° C according to some papers I found.

author: mtdoc
author_rank: Super Contributor
timestamp: September 01, 2016, 06:22:52 am
content: Quote from: sleemanj on September 01, 2016, 06:09:38 amOh yeah. I hadn't considered that. They do do lesions of spinal sensory nerve roots sometimes. Usually people who are having specific, localized, recurrent pain due to bony impingement of nerve roots as they exit the spinal cord and pass through the spinal foramin. IME it's not done that often but I've had a few patients who've gotten good relief from it.

author: CJay
author_rank: Super Contributor
timestamp: September 01, 2016, 06:47:21 am
content: Similar to the cardiac ablation generators that crop up from time to time, I've often considered them to be worthy of a tear down but never managed to find one cheap enough.

author: XOIIO
author_rank: Super Contributor
timestamp: September 01, 2016, 06:51:11 am
content: Whoa.... creepy and I want it!

author: Brumby
author_rank: Unknown
timestamp: September 01, 2016, 07:02:37 am
content: Yes, creepy ... and you can have it.

author: mtdoc
author_rank: Super Contributor
timestamp: September 01, 2016, 07:03:14 am
content: Ah, I see now a clue that it is used as a medical device and not for research - the output jack on the bottom right is labeled "patient".

author: VK5RC
author_rank: Unknown
timestamp: September 01, 2016, 09:40:56 am
content: RF ablation was used on my father's primary liver cancer and he survived 18months not the usual 3months, not sure if that is the same type of device, I recall the RF used on Dad was about 2GHz cw.

author: rsjsouza
author_rank: Super Contributor
timestamp: September 01, 2016, 10:41:33 am
content: Wow, that is a big honking Metcal soldering iron base!
Resistor code alarm for android. - Page 1
Forum section: electronics / general

author: Nexo
author_rank: Regular Contributor
timestamp: August 31, 2016, 05:50:19 am
content: Hello everyone!I'm not sure where else to post this idea but I'm sure that, if I'm not in the right place, Mods can move it to right one.I have an alarm app which only goes off when you solve a preset number of equations and it has helped me to wake on time and I was wondering, what if instead of solving equations, we solve some exercises on resistor's color code? For example, to solve 3 Color to value and 3 Value to color, otherwise the alarm won't go off.This might sound silly for most of you because the color code is already a part of you but it will be helpful for those who have just started with Electronics.The only downside is that I don't know how to create it because Java (Android's programming language) is not my language, I'm barely learning C and C++ so as to try to learn another one and that's the reason why I'm posting this, can or would someone be able to help me out with this project? I mean, some ideas, a piece of code or a few tutorials that can help me program this in Java.I hope you can help me out and if the we are able to make it, it will, obviously, open source and I'll take the time to create (after I've learn it) video tutorials in order to help others customize and create new apps based on this one.Thanks for your time reading me!See you!

author: Nexo
author_rank: Regular Contributor
timestamp: September 01, 2016, 03:24:19 am
content: Anyone ?

author: MK14
author_rank: Super Contributor
timestamp: September 01, 2016, 03:56:16 am
content: https://developer.android.com/training/basics/firstapp/index.html