hybridfree/eevblog-posts huggingface dataset:
50kHz lighting bus for contactless LED lighting system - Page 1
Forum section: electronics / general

author: ocset
author_rank: Super Contributor
timestamp: August 04, 2019, 09:15:46 am
content: Hi Guys“Contactless LED lighting”It’s a lighting system that uses a 50kHz power bus, and the energy is coupled out to various LED lights, via inductive couplers. (literally ferrite blocks with a secondary in them which you place round the 50khz power bus…the 50khz power bus is the primary) So its “contactless”, and therefore supposedly has properties that make it very useful for very wet environments.But why don’t they just use normal 50Hz mains with waterproof luminaires with waterproof connectors?Here is some info on it….https://www.electro-tech-online.com/threads/worldwide-lighting-made-20-more-efficienct.135162/Heico lighting used to do it, and others still are, but Heico I think sold out.http://www.heicolighting.com/index.cfm

author: T3sl4co1l
author_rank: Super Contributor
timestamp: August 04, 2019, 09:19:01 am
content: Sounds like something we played with (more theoretically than practically, don't think we ever built one of it), for induction heating. That case being a rotating transformer, so you have some degree of freedom on the work head instead of everything being bolted in place by bus bars and copper pipes.Tim

author: ogden
author_rank: Super Contributor
timestamp: August 04, 2019, 10:09:11 am
content: Domain isotera.com for sale, 5.5k$. Do not look like successful company at allContactless bus clamp transformers are cool only for those who do not know about gel-filled t-taps which are definitely cheaper. Idea kind of cool, but one gigantic issue - EMI. You do not want that 50KHz cable to be near any communications copper cable (*DSL, Ethernet and so on).

author: ocset
author_rank: Super Contributor
timestamp: August 04, 2019, 01:59:02 pm
content: Thanks, i think isotera was bought out.
In need of inspiration for your small apartment/bedroom/etc labs! - Page 1
Forum section: electronics / general

author: rawrs
author_rank: Contributor
timestamp: July 31, 2019, 01:05:52 am
content: Hi all,I'm sharing a house at the moment which is just about driving me to drink, and I'm starting to look for ways on how to get out, once I've gotten some work that I can actually do, some kind of income that will allow me to get my own place. I've always dreamt of an apartment in the city. Because I live in Brisbane, that might actually be attainable in not too many heat deaths of the universe from now.But this brings up an interesting proposal. What about ideas for a tiny electronics lab? I bought my cheapy oscilloscope off a guy who had a lab in his RV. I know that doesn't sound dodgyat all, but here are a couple of pics. He made use of every inch of space, and I actually really loved the idea of it. I hope this kind gentleman doesn't mind me using these photos, but I loved the setup.So I'm curious about what you guys have done. It seems a lot of new apartments have a hole-in-the-wall "study nook", which is pretty useless when you're used to an office. An office the size of a regular bedroom would be no worries for a full workstation and lab setup, but not all of us can afford an apartment with a large office like that in it! Plus I think many of us can draw inspiration from what others have done.Apologies if this has been done before, but I tried having a quick look and couldn't really find much. I'm sure I wasn't looking hard enough or something, though.Thanks,Rory

author: MarkF
author_rank: Super Contributor
timestamp: July 31, 2019, 11:40:41 am
content: Here is an old picture of my workbench in a small bedroom:I had to move the soldering station to a small desk on the opposite side of the room.I was getting small solder flecks on the anti-static mat that I was afraid would short my protoboards.Plus the thread of other's workbench setups:https://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/msg988168/#msg988168

author: rdl
author_rank: Super Contributor
timestamp: August 03, 2019, 10:46:38 am
content: Electronics is a great hobby for small spaces. Here is a pic of my setup just before I moved it out of the closet.

author: BillB
author_rank: Unknown
timestamp: August 03, 2019, 12:21:00 pm
content: Secret hide-away mini-workshop... In a closet - two TV trays for the bench.https://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/msg1460081/#msg1460081

author: Dubbie
author_rank: Unknown
timestamp: August 04, 2019, 02:06:58 am
content: Here is my closet lab. I fear if it was any larger, the mess would just get bigger and working space would stay the same.Out of frame on the right is microscope, reflow oven and laptop.

author: BrianHG
author_rank: Super Contributor
timestamp: August 04, 2019, 02:37:16 am
content: Quote from: BillB on August 03, 2019, 12:21:00 pmNice one...
MIT Centennial Round Table 1961    The significance of science and technology - Page 1
Forum section: electronics / general

author: German_EE
author_rank: Super Contributor
timestamp: August 04, 2019, 02:57:15 pm
content: TV used to show stuff like this when I was young, and at the end of the programme you actually felt smarter. Now it's all cooking competitions, talent contests and crime shows, so I go on the Internet instead.
Mars 2020 Rover construction pictures (big pics) - Page 1
Forum section: electronics / general

author: Homer J Simpson
author_rank: Super Contributor
timestamp: August 01, 2019, 04:05:00 am
content: From JPLhttps://www.jpl.nasa.gov/missions/mars-2020/MMRTGhttps://en.wikipedia.org/wiki/Multi-mission_radioisotope_thermoelectric_generator

author: German_EE
author_rank: Super Contributor
timestamp: August 02, 2019, 08:45:34 pm
content: Never seen so much kapton tape!

author: MyHeadHz
author_rank: Regular Contributor
timestamp: August 03, 2019, 03:14:06 am
content: Do they put all that kapton tape on by hand from rolls? ... and are those manually tied knots to secure the wires and tape? It just seems odd to me that with all the advanced tech on the thing we would have invented better ways for that by now.

author: TheNewLab
author_rank: Frequent Contributor
timestamp: August 03, 2019, 05:07:17 am
content: as I understand, a lot of the hand assembly stuff is because they need it absolutely clean room build environment.Funny before I knew waht kapton tape was, I just thought of it as gold foil, or gold leaf, and was amazed at hhow much money NASA spent on gold LOL
basic literature beginings for laboratory laser optics ? - Page 1
Forum section: electronics / general

author: coppercone2
author_rank: Super Contributor
timestamp: August 05, 2019, 03:04:32 am
content: So what is a equivilant to a microwave book such as introduction to microwaves by wheeler or introduction to microwave theory and measurements by al lance?Preferably 'old' books that cover the basics in a laboratory fashion (if you look at the books I listed they show you all the cool pictures like drawings of waveguide parts, old experiments, block diagrams, etcI am interested in learning about things like mirror mounts, focusing optics, inferometry etc. From a practical standpoint, not just equations and graphs.
Sumsour 858D hot air station without a transformer vs with a transformer - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: August 02, 2019, 04:25:04 pm
content: I just received a Sumsour 858D Hot air station. I wanted to have a look inside before I powered it on. I discovered there was no transformer. Every 858D I've seen has a transformer.Is the 858D with a transformer a superior product?

author: bdunham7
author_rank: Super Contributor
timestamp: August 02, 2019, 08:53:43 pm
content: The yellow thing is a transformer. Obviously it is just for the control circuits. Do other 858Ds have a big, heavy transformer ~1KVA or so? I think they just have a different configuration with a control-circuit only transformer. FWIW, I have this exact unit (Sumsour) and it appears to work flawlessly.

author: RazorRust
author_rank: Newbie
timestamp: August 02, 2019, 10:59:10 pm
content: I am the OP. Didn't realise I made my username my email.Thanks! That is good to know. Yea the other 858d's ive seen have a transformer like this.

author: amyk
author_rank: Super Contributor
timestamp: August 03, 2019, 12:14:52 am
content: It's basically a very high temperature hair dryer. Do hair dryers need transformers?No, a mains-voltage heater can output the same power for a lower current draw.It looks like this version uses a small SMPS to power the control circuitry, which might be slightly less reliable than a linear supply but I doubt it'd make much of a difference.
Built in resistors in PCB - Page 1
Forum section: electronics / general

author: daqq
author_rank: Super Contributor
timestamp: July 31, 2019, 09:50:49 am
content: This is pretty awesome:https://www.pcbcic.com/wp-content/uploads/2017/10/5-Ohmega_Design_Version_18_1.pdfBasically resistive material is built into the conductive layers (even internal) of a PCB and the technology seems pretty precise, enabling stuff like termination/pullup resistors on the inner layers between the balls of a fine pitch BGA.

author: Brutte
author_rank: Frequent Contributor
timestamp: July 31, 2019, 11:44:30 am
content: Carbon ink comes to mind, although carbon ink can be only applied to surface and vias (no internal layers afaik).I am not sure how to integrate that in a toolchain (managing libraries, testing, DRC, etc). For termination of GHz signals under FPGA it might have its place but in mainstream electronics the access to this kind of service seems quite limited. For analog applications and 3% tolerance - niche market.I am waiting for a built-in transistor

author: soldar
author_rank: Super Contributor
timestamp: July 31, 2019, 03:26:02 pm
content: I can see in the future PCBs where the tracks are really printed and the ICs are embedded inside the PCB, not on the surface.

author: daqq
author_rank: Super Contributor
timestamp: July 31, 2019, 05:45:17 pm
content: QuoteSome of this is actually being done already:https://www.microsemi.com/product-directory/services/3710-package-miniaturization-serviceshttps://nmi.org.uk/wp-content/uploads/2016/10/1-IMAPS_UK_2016_Ostmann.pdfThe initial costs must be insane, but probably worth it.

author: GlennSprigg
author_rank: Super Contributor
timestamp: August 01, 2019, 12:00:30 pm
content: I was led to believe that some original IC's, had 'Pseudo' components, like....Very thin 'tracks' as resistors, and very CLOSE tracks as Capacitors ??

author: SiliconWizard
author_rank: Super Contributor
timestamp: August 01, 2019, 01:30:53 pm
content: Yes you can embed components inside a PCB.https://www.we-online.com/web/fr/index.php/show/media/04_leiterplatte/2015_1/webinare_4/embedding/WE_CBT_ECT_How_to_handle_a_PCB_project_with_embedded_components.pdf

author: @rt
author_rank: Super Contributor
timestamp: August 01, 2019, 02:15:25 pm
content: If I etch the copper I might get a capacitor.
UV Glue that doesn't set - Page 1
Forum section: electronics / general

author: NivagSwerdna
author_rank: Super Contributor
timestamp: August 01, 2019, 04:32:39 pm
content: I bought some cheapo UV glue pens from China and the latest version.... don't seem to set.Is this because UV glue has a short shelf life or because I got sold UV glue that doesn't set!?Thanks in advance

author: windsmurf
author_rank: Frequent Contributor
timestamp: August 01, 2019, 04:39:52 pm
content: Did they specify a particular wavelength UV light to set it? Are you using a UV source with that spec?EDIT: Oh I missed the "pen" part so it came with a UV source presumably that works with the glue... maybe they gave you a bad UV light pen? Perhaps test the glue in sunlight?

author: soldar
author_rank: Super Contributor
timestamp: August 01, 2019, 05:20:52 pm
content: Sounds like the setup for a joke.- What do you call glue that doesn't set?- Goo?Never mind. Carry on.

author: james_s
author_rank: Super Contributor
timestamp: August 01, 2019, 05:25:56 pm
content: Two things I can think of. One is possibly the wrong wavelength, that can be quite critical.The other is defective glue, past shelf life, contaminated or perhaps just a bad batch.

author: NivagSwerdna
author_rank: Super Contributor
timestamp: August 01, 2019, 07:36:21 pm
content: I've used the light at the end.... not settingAnd a few alternatives.. no joy.I guess I'll bin it and try again.

author: james_s
author_rank: Super Contributor
timestamp: August 01, 2019, 07:51:35 pm
content: Inform the seller, they might just send another.

author: rdl
author_rank: Super Contributor
timestamp: August 02, 2019, 01:49:44 am
content: Smear a little of the glue on a piece of glass or something non-porous and put it out in the sun. It may take a little while, but it should set eventually. If it doesn't it's probably a bad batch.
Heroku - Page 1
Forum section: electronics / general

author: nForce
author_rank: Frequent Contributor
timestamp: July 30, 2019, 05:30:30 pm
content: Hello, does anyone know what Heroku is? I would like to know how many apps can you have per 1 account?

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 30, 2019, 06:41:31 pm
content: Google "Heroku Apps per account":https://stackoverflow.com/questions/48524995/how-many-apps-are-allowed-on-a-hobby-heroku-plan

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 30, 2019, 06:51:23 pm
content: Quote from: nForce on July 30, 2019, 05:30:30 pmThis looks like a thinly veiled plug.

author: exe
author_rank: Unknown
timestamp: July 30, 2019, 07:35:30 pm
content: We used to use it. It was horribly expensive. We were paying ~300 or 400 euro for a simple service, log storage, SSL, mysql, and three pipelines (dev, stage, prod). I reduced costs by a factor of 10 when moved from Heroku to bare metal. As a bonus, we got twice more horsepower. Not that I recommend using bare metal for unexperienced users, just there are better options. I'd say avoid, unless their free plan fits you and you know you won't exceed it. It's also a proprietary solution compatible with nothing.PS that was in 2016, don't know about their current pricing.

author: nForce
author_rank: Frequent Contributor
timestamp: July 31, 2019, 04:25:37 pm
content: Sorry, but I was asking for the free account.My question is: What do I get for free on Heroku? The number of apps, storage limit, etc...

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 31, 2019, 04:27:10 pm
content: Quote from: nForce on July 31, 2019, 04:25:37 pmIf it's free, why bother asking us? Just sign up and see for yourself. Maybe report back so others don't have to try.

author: bd139
author_rank: Super Contributor
timestamp: July 31, 2019, 04:28:40 pm
content: Heroku is for people who like being locked in an inescapable cage that charges you every time you breath out.

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 31, 2019, 06:14:26 pm
content: Quote from: nForce on July 31, 2019, 04:25:37 pmWhich is exactly what the link I posted shows, did you even bother to click it?Never mind, why I'm doing the research you seem to be too lazy to do yourself?

author: nForce
author_rank: Frequent Contributor
timestamp: July 31, 2019, 06:29:55 pm
content: Quote from: PA0PBZ on July 31, 2019, 06:14:26 pmYes, I clicked your link. But I thought that things have changed from 2018, so if someone can give a fresh answer, from today. I also asked about the size limit of your app.I am not even sure if it's now really free, because some answers are against my thoughts beeing something free.

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 31, 2019, 07:32:13 pm
content: Why don't you just try? It's not as if you'll lose much. I don't understand how asking here and waiting for answers is supposedly better than making an account and checking it out yourself.
Apple recalls 432000 macbooks after injuries, fire risk; still allowed on planes - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: June 29, 2019, 08:57:38 pm
content: https://www.theregister.co.uk/2019/06/28/recalled_macbook_injuries/

author: Raj
author_rank: Frequent Contributor
timestamp: July 30, 2019, 02:08:55 pm
content: Modern Macs: Blows budget and itself
Identify RF ambients - Page 1
Forum section: electronics / general

author: DeanA
author_rank: Regular Contributor
timestamp: July 29, 2019, 05:15:10 am
content: Hi,Anyone help me identify some large RF ambient signals, see attached, location Sydney Australia.First block is around 710MHz,Second block around 757MHz to 786MHz,Third block is around 862-891MHz,Fourth block 941-961Mhz,I tried looking for something from ACMA but nothing easily searchable. I'm guessing some are mobile phone frequencies. The 710Mhz one is intermittent but the others are constant.Thanks,

author: Whales
author_rank: Super Contributor
timestamp: July 29, 2019, 05:46:50 am
content: 915-928 is ISM in Aus. Below 915 isn't technically allowed here, but a lot of imported stuff still uses it (many countries have this band starting down in the 800's). Not sure about the higher freqs or the 700MHz.What are ACMA like? Are they the sort of people you can just ring up and ask what/who this band in this location is being used for? I know their website feels like fancy garbage to navigate through

author: DeanA
author_rank: Regular Contributor
timestamp: July 30, 2019, 12:46:24 am
content: Ok,I've done some more research and found some information from ACMA here:https://www.acma.gov.au/Industry/Spectrum/Spectrum-planning/About-spectrum-planning/band-plans-spectrum-planning-acmaSo the signals at 942MHz to 960Mhz are CMTS (Cellular Mobile Telephone Service) Base transmit.862-890Mhz maybe radiolocation, we're close to the Airport.Still not really sure about the other frequency.Regards,Dean.

author: mjs
author_rank: Regular Contributor
timestamp: July 30, 2019, 08:38:45 am
content: First block is around 710MHz - TVSecond block around 757MHz to 786MHz - TVThird block is around 862-891MHz - LTE band 5 Downlink 869-894MHzFourth block 941-961Mhz - LTE band 8 downlink 925 – 960 MHz
Apollo project egress - building escape hatch replica - Page 1
Forum section: electronics / general

author: soldar
author_rank: Super Contributor
timestamp: July 28, 2019, 08:09:01 am
content: As part of the commemoration of the Apollo Moon project Smithsonian and Dan Savage built a replica of Apollo 11 escape hatch. Many people built different parts and sent them to the Smithsonian to be assembled. Mostly mechanical part making.https://airandspace.si.edu/events/project-egress-buildhttps://www.youtube.com/results?search_query=project+egresshttps://www.youtube.com/watch?v=d6SbRkM0C3s?t=0https://www.youtube.com/watch?v=DDttNgCpquo?t=0https://www.youtube.com/watch?v=PqXEFe4NIW4?t=0

author: sleemanj
author_rank: Super Contributor
timestamp: July 28, 2019, 11:35:02 am
content: Quote from: soldar on July 28, 2019, 08:09:01 amAdam

author: soldar
author_rank: Super Contributor
timestamp: July 28, 2019, 01:10:47 pm
content: Quote from: sleemanj on July 28, 2019, 11:35:02 amYes, sorry, I don't know what I was thinking when I got those Savages mixed up.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 28, 2019, 11:32:56 pm
content: Tim
Does SRAM have sense apmplifier? - Page 1
Forum section: electronics / general

author: vlad777
author_rank: Frequent Contributor
timestamp: July 28, 2019, 07:25:12 pm
content: I am looking at this datasheet for SRAM and on the page two diagram it shows sense amplifier?https://eu.mouser.com/datasheet/2/12/AS6C62256A-1288444.pdfIs this a mistake? SRAM doesn't have sense amp?How about row and column addresses ?

author: ataradov
author_rank: Super Contributor
timestamp: July 28, 2019, 08:07:29 pm
content: Row and column addresses are fine, they just show how the memory is organized internally. From the outside it does not matter.The sense amplifier probably is their name for logic that converts internal voltage (probably 1.0 -1.2 V) to the I/O voltage.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 28, 2019, 09:23:00 pm
content: Yes they do, to decrease read time.You may find this interesting:https://www.ijarcce.com/upload/2015/may-15/IJARCCE%207.pdf

author: ataradov
author_rank: Super Contributor
timestamp: July 28, 2019, 09:44:27 pm
content: Ok, that actually makes sense, since you naturally get a differential output from the SRAM cell, so a fast differential amplifier will be able to provide an output faster.
New AutoFocus Camera noise problem - Page 1
Forum section: electronics / general

author: goldfinger_
author_rank: Newbie
timestamp: July 28, 2019, 04:06:22 pm
content: Does anyone here have a Auto-focus microscope camera ?Recorded this up close, I'm told there is some noise from the motor but this sounds gritty to me.Just got this and have no reference to know if this is a normal healthy sound for this type of camera or is something I need to get the vendor to resolve ?
help out Becky Button with a massive distributed array of low power computers - Page 1
Forum section: electronics / general

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 27, 2019, 03:55:27 am
content: Background:https://twitter.com/einsteinunicorn/status/1153854150846889984Quick summary is that Becky Button got into a pretty bad accident, she survived but at a big financial cost. (Please no discussions on the circumstances of the accident. I also did not know about her until another member of the maker community announced her situation.)https://www.gofundme.com/f/beckybuttonacccidentfundIt's in my nature to help those in need, but that's clearly a situation well beyond the capacity for just one person to (directly) make a difference. It's also easy to understand that not everyone wants to just give away their own money. My interest in cryptocurrency mining, however, does offer a solution. One Raspberry Pi and one Android smartphone (on one IP) can make about $12/month or so mining Swagbucks. Multiply that by a few thousand setups run by makers and we'll end up with a distributed supercomputer, each piece working on a small part of the problem.Here's the script to run on the Pi in order to supervise the mining, will require tweaking to get it to work:https://pastebin.com/XvACe09KHope the code is clear enough for other makers to understand how to make use of it. It was developed when Swagbucks mining was far more profitable and I never thought I would ever share the code with anyone else or have it run on any setup except my own. But now, I have little to lose and the maker community has a lot to gain. Even if that skyrockets the difficulty and significantly cuts into my mining profits, I'll be happy if it means the maker community is gaining far more than I could otherwise give them.

author: edy
author_rank: Super Contributor
timestamp: July 28, 2019, 04:31:33 am
content: Lots of comments on the GoFundMe page saying they got there because of Naomi Wu. Awesome to see another Maker helping to spread the word... the community is gathering together.

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 28, 2019, 05:26:28 am
content: I would like to see the option of Bitcoin or other cryptocurrency donations. Ideally Curecoin/Foldingcoin even though that would be more appropriate for medical bills due to cancer. But not Swagbucks even though that could theoretically allow the miners to directly fund her, since the Swagbucks exchange is not particularly trustworthy with large exchanges. (In fact, I think the only good thing about Swagbucks is the good mining profitability.)
Has anyone seen the inside of a color matching system? - Page 1
Forum section: electronics / general

author: ezalys
author_rank: Frequent Contributor
timestamp: July 27, 2019, 05:27:55 pm
content: Hey all, has anyone looked at the inside of a color matching device? I’m curious what light sources are used, if multiple sources are used at different angles, and what kind of sensors are typically used.

author: tooki
author_rank: Super Contributor
timestamp: July 28, 2019, 03:56:33 am
content: You mean things like the spectrophotometers they have at paint stores for matching paints?

author: NiHaoMike
author_rank: Super Contributor
timestamp: July 28, 2019, 04:51:36 am
content: The one I used in chemistry class long ago was just a RGB LED and solar cell on opposite sides of a test tube holder, then there's a rotary dial to select the color and a digital panel meter calibrated to display absorbance, all packaged into a generic black project box. Very low tech and primitive, but it works!
Electrochromic Effect - Page 1
Forum section: electronics / general

author: 741
author_rank: Frequent Contributor
timestamp: July 27, 2019, 06:35:27 pm
content: This linkhttps://www.americanscientist.org/article/switching-colors-with-electricitydiscusses the electrochomic phenomenon.I actually came across it whilst trying to recall something I read about an element which develops coloured lines when an electric current is passed through it. I thought it was lithium, now I'm not sure.However, the search I entered did lead me to the above. Not the result I was after, but interesting nonetheless.
What is this type of bulb or lamp? - Page 1
Forum section: electronics / general

author: Axxel
author_rank: Contributor
timestamp: July 31, 2019, 03:14:11 pm
content: Dear friends.As I can see, this type of lamp is powered with 3000...4500V, it this case this lamp is used to generate ozone () and when it's powered it acts like a little plasma ball, but with a orange color.Here they are selling this types of bulbs, and the tranformer:https://www.todoelectronica.com/es/1695-lamparas-y-tranformadoresWhat is the type of this lamp, what type of gas have?Hope you can help me!Do you think this lamp is on purpose buided to make ozone OR this lamp is used for other thing in industry?Regards

author: technix
author_rank: Super Contributor
timestamp: July 31, 2019, 03:17:48 pm
content: This looks like some kind of discharge tube to me.

author: Stray Electron
author_rank: Super Contributor
timestamp: July 31, 2019, 03:37:47 pm
content: Orange discharge would indicate that it's filled with neon gas. What does the label say? 3000 volts sounds HIGH! Is that continuous or only pulsed? I've never heard of a neon lamp that produced ozone, most of the lamps that produce ozone are mercury vapor lamps and they emit mostly UV-B and UV-C and they have a quarz (not glass) tube because quartz passes the UV better. Are you SURE that 3000 volts isn't the ignition voltage and that the operating voltage isn't considerably less?You might want to go look up UV germicidal lamps.You can go buy one of those piezo-electric spark generators like those that are used to ignite gas grills and hold the wire next to the glass envelope and fire it and it will usually made a flash inside the tube and you can tell from the color of the flash what kind of gas is it. You can find the spark generators at Home Depot in the US. You don't have to connect to an electrode on the lamp just place the wire lead next to the glass and that is usually enough to generate a small flash.PS. The old EPROM erasers also used UV lamps in them to erase the contents of the EPROMs.Fair Warning! UV, particularly UV-B and UV-C is extremely damaging to the eyes and somewhat damaging to exposed skin. You've been warned.

author: themadhippy
author_rank: Super Contributor
timestamp: July 31, 2019, 04:25:25 pm
content: QuoteOr low pressure sodium

author: duak
author_rank: Super Contributor
timestamp: July 31, 2019, 05:21:04 pm
content: I think it might be from an ozone generator:http://www.jelight.com/wp-content/uploads/2018/03/Model-610b.pdfI'm guessing it's a low pressure mercury lamp that has neon in it to improve the mercury UV discharge.

author: Axxel
author_rank: Contributor
timestamp: July 31, 2019, 06:40:11 pm
content: Thanks for your answers!Here I added more informations on the main topic!Regards.
Rutger Hauer has passed away - Page 1
Forum section: electronics / general

author: bsudbrink
author_rank: Frequent Contributor
timestamp: July 24, 2019, 08:31:42 pm
content: https://arstechnica.com/gaming/2019/07/rutger-hauer-genre-actor-and-blade-runner-icon-has-died-at-75/

author: Kjelt
author_rank: Super Contributor
timestamp: July 24, 2019, 08:39:36 pm
content: RIP"All those moments will be lost in time, like tears in rain"

author: chris_leyson
author_rank: Super Contributor
timestamp: July 24, 2019, 08:54:25 pm
content: RIP. Roy Batty's monologue seems even more poignant now.

author: edy
author_rank: Super Contributor
timestamp: July 25, 2019, 11:29:52 am
content: One of my favourite movies, and favourite scenes.... apparently he didn't follow the script exactly but the result was still incredible.https://en.m.wikipedia.org/wiki/Tears_in_rain_monologue

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 26, 2019, 01:57:06 am
content: Hobo with a ShotgunWhat a crazy movieIt's R rated so here' a review , IDK how to make it a link and not the video, out this after youtube .com/watch?v=r38jR88vnlwHobo with a Shotgun Review - Off The Shelf Reviews

author: digsys
author_rank: Unknown
timestamp: July 26, 2019, 02:08:04 am
content: Also one of my most favourite of all time .. still have all the collectors edition CDs with directors versions. He was an awesome actor
History of early electronics - Page 1
Forum section: electronics / general

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 26, 2019, 01:14:10 am
content: I've watched some good documentaries on the early years of electricity, but there's not near enough, nor lectures on it. I'm wondering stuff like when Volta and others made batteries, what all did they start doing ? When did they really get going and realize there's switches, resistors, capacitors and inductors, and lets make some circuits ? I'll start reading some wiki or something later, I swear. I've forgotten a lot of it too.Pretty early they found it can effect chemicals (besides burning). But about how long was it from having DC sources, to anyone with the money/know how (there's lots of secrecy, lack of instant communication, etc, I know) would have known = , I should build/buy some resistors/cap's/inductors and see what they can do together? I guess the time of Faraday, and they were really getting math involved.After lights, what was the early circuits they'd make ? Tanks circuits, jeez. What size scale and frequencies was stuff on so that they noticed anything ?Frequency wise, did they go from making things at a few Hz, then making audio freq stuff. How long did that take? How long after that till they where at the door steps of radio frequency machines ?

author: amyk
author_rank: Super Contributor
timestamp: July 26, 2019, 01:57:23 am
content: Go to archive.org, search "electricity", sort by date, and start reading...I suggest to start here (yes, 1775 --- a year before the US became independent):https://archive.org/details/historyandprese00priegoog

author: tggzzz
author_rank: Super Contributor
timestamp: July 26, 2019, 08:46:20 am
content: Quote from: lordvader88 on July 26, 2019, 01:14:10 amThis is becoming tedious, and you are making yourself look like a twat.Use google for questions like that.
Understanding a particle horizon diagram - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: July 23, 2019, 06:33:34 pm
content: I found a video to this but I can't find the thread I just made, anywaysWhat does the graph on the bottom represent since it starts us not at 13.8 Ba? The scale on the right is Lorentz transformation?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: July 23, 2019, 10:03:04 pm
content: The Hubble sphere reaches a maximum (x axis) value of about 13.8 Ga.Tim
Classical Portrait of David Jones per aiportraits.com - Page 1
Forum section: electronics / general

author: sambonator
author_rank: Regular Contributor
timestamp: July 23, 2019, 07:33:51 am
content: Here's what was output when I pointed aiportraits.com to Dave's picture.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 23, 2019, 09:15:34 pm
content: I've tried a couple times and never got it to work. It was always too busy and would ask to try later.Now the site is completely down.I dunno whether this is your post that triggered all this sudden interest!
"Walking On Water" 'trick'.... Not what you think!!!! - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 20, 2019, 12:41:24 pm
content: We've all seen the crap on the likes of 'Mythbusters', where they try to re-create scenes of peoplerunning fast from the shore-line, and supposedly "Walking on water". OBVIOUSLY this is FAKE, andthey are running on slightly submerged boards.... HOWEVER !!............The following is NOT 'faked' as such. There are NO hidden boards, and the 'runner' is truly doingwhat his body does !!... The 'illusion' is simply that the CAMERA view is turned up-side-down!!The 'runner' is under water, with his feet just touching the surface. Most impressive !!!!

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 20, 2019, 12:49:28 pm
content: I noticed that 'oxdeadbeef' always looks at my posts !! haha....

author: soldar
author_rank: Super Contributor
timestamp: July 20, 2019, 01:32:38 pm
content: I had seen that footage and noticed a strange feeling about the movements but never suspected how it was done.Interesting.

author: vtwin@cox.net
author_rank: Regular Contributor
timestamp: July 22, 2019, 03:55:04 pm
content: the movement doesn't look natural, so even without the fish in the camera view, I would have suspected something amiss.I walk on water all the time.... just happens to be in a solid rather than liquid format.

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 22, 2019, 04:10:38 pm
content: Well, staying that straight upside down under water must certainly take a lot of practice IMO.

author: BrianHG
author_rank: Super Contributor
timestamp: July 22, 2019, 06:25:37 pm
content: The scuba diving buoyancy cancellation weights in the opening photo is a dead giveaway what he is upside down.

author: soldar
author_rank: Super Contributor
timestamp: July 23, 2019, 08:17:41 am
content: Similar video used in Spain to show what multiple sclerosis feels like and to promote awareness. I had no idea how it was done. It now makes me think of those choreographed water gymnasts and how they do things that seem almost impossible.
HackRF One as a Antenna Analyzer or Just a SWR meter? - Page 1
Forum section: electronics / general

author: Fusion
author_rank: Newbie
timestamp: July 22, 2019, 07:24:22 am
content: Do you think it's possible to use the HackRF One to determine SWR of an antenna at a specific frequency? I have a noise generator in a directional coupler. I have read an article on this subject but the tools they provide seems not to be compatible with the HackRF One.Tools at my disposal.Tektronix 465 Scope :http://bit.ly/2XXgvnbMultimeter : no linkLNA 0.05-4G NF=0.6dB With 19dB gain :https://ebay.to/2M9It8t3 Watt Power Amplifier :http://bit.ly/2Z6w1cYDirectional coupler :http://bit.ly/2Z6w8VWNoise generator :https://ebay.to/2Z0tcu2100Mhz frequency counter : no linkOS = Windows 10GNU Installed.Thanks,Brian

author: bd139
author_rank: Super Contributor
timestamp: July 22, 2019, 08:51:51 am
content: Yes you can do that. It's pretty much an old fashioned way of doing it though similar to a noise bridge.Not sure what tools are present with the HackRF one but all you need is a reference power into the SDR front end from a 50 ohm termination instead of the antenna, then the peak return loss at the frequency of interest. You can convert that into a VSWR using the table here:https://www.electronics-notes.com/articles/antennas-propagation/vswr-return-loss/vswr-return-loss-conversion-table.php... it's easier to look for the power dip though in the SDR waterfall as that represents where the most power is being eaten by the antenna and lowest VSWR.If you want absolutely measurement it's much better to skip the noise generator and use a signal generator and power sensor. I use an AWG and homebrew AD8307 power sensor for this.

author: awallin
author_rank: Frequent Contributor
timestamp: July 23, 2019, 07:22:03 am
content: For inspiration you might look at the block diagrams or schematics of rigexpert antenna analyzershttps://rigexpert.com/(ofcourse if you have 3-500 $/eur to spare and don't need to go up to 6 GHz then a rigexpert will do the job well..)

author: bd139
author_rank: Super Contributor
timestamp: July 23, 2019, 07:54:27 am
content: Yeah I have an AA-55 Zoom. Nice bit of kit.
How Apollo 14 was saved by a computer hack - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 22, 2019, 12:03:27 pm
content: Actually, the quick thinking Coder, ORIGINALLY made a change to entertain the Astronauts so thatthe arrangement of the digits on the display would read 'BOOB' when they viewed it up-side-down !!However, he quickly realized the error of his ways... (sorry)Seriously though, that was quick thinking!! Imagine if he got it wrong !

author: Sal Ammoniac
author_rank: Super Contributor
timestamp: July 22, 2019, 03:58:58 pm
content: The story straight from the guy who did it:https://www.amazon.com/Sunburst-Luminary-Apollo-Don-Eyles/dp/0986385905
Space time with stuart gary: - Page 1
Forum section: electronics / general

author: Beamin
author_rank: Super Contributor
timestamp: July 21, 2019, 07:54:35 pm
content: For those who don't know:https://youtu.be/q4rpdYuHwLYI can listen to this for hours : its like the news but science and its not dumbed down, don't worry he never explains the Doppler effect. Seems to come out every few days.

author: Chriss
author_rank: Frequent Contributor
timestamp: July 21, 2019, 08:35:44 pm
content: Thank you for the link.Sent from my SM-J500F using Tapatalk
'Cyber Security' (In Japan??) - Page 1
Forum section: electronics / general

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 17, 2019, 12:40:41 pm
content: Being the incredibly complex & important topic that this IS, in todays World...It seems that Japans latestcyber-security minister,Yoshitaka Sakurada, has been quotedas admitting that he has "Never used a computer in his life" !!He doesn't think that this 'impedes' his capabilities at all though...Reporters asked him a quite relative question, about if the use of 'USB' devices/drives werein use at the country's nuclear power stations. He was totally stumped, and they doubtedif he even KNEW what aUSB device/driveeven WAS !!!We KNOW there are 'levels' of management, but maybe this 68-yo should know a LITTLE bit more,to be in his position... It SMACKS of power & ignorance, over modern necessities

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 17, 2019, 12:56:21 pm
content: That's fun. But I think this is pretty much the same with most ministers in most countries.In many regimes if not most, a minister is basically just representing their ministry and giving TV interviews. There's a myriad of people working for them. Their decisions always depend on a series of reports from their team and from external experts. To me they are basically just a name and a signature.That said, it's a management question as you mentioned. As a top manager, you will sometimes have (even if it's not often as a minister) to make a decision based on contradictory facts and reports. That's obviously when knowing a bit about the subject may help...OTOH, having specialists as ministers is not always a good thing either. As specialists with a career path in the field, they will often have a large professional network and the possibility of a conflict of interest is much higher.I admit that the level of ignorance you mention is mind-boggling though.

author: Sparky49
author_rank: Regular Contributor
timestamp: July 17, 2019, 10:49:35 pm
content: If you have no computer, you must be very hard to hack.Saying that, if this was going to happen anywhere I would've guessed Japan. They are still very much focused on paper for daily business, and meetings are conducted in person - even short ones. Many businesses still do not have websites, and a surprising number do not even use computers at all. It is an interesting reality, which contrasts with the world-leading, high-tech aspects of the country.

author: GlennSprigg
author_rank: Super Contributor
timestamp: July 20, 2019, 12:10:37 pm
content: Quote from: Sparky49 on July 17, 2019, 10:49:35 pmI rest my case......
Need help identifying a MFG IC Mark - Page 1
Forum section: electronics / general

author: Sarcarean
author_rank: Contributor
timestamp: July 19, 2019, 01:58:39 am
content: The logo is a stylized "MR" with lines shooting around it. Anyone know who this is?[ Specified attachment is not available ]

author: gamalot
author_rank: Super Contributor
timestamp: July 19, 2019, 04:23:20 am
content: I think it's a 25Q40 serial flash memory chip, but I don'rt know what's "MR" ......

author: daqq
author_rank: Super Contributor
timestamp: July 19, 2019, 06:10:55 am
content: I'm not sure about the specific manufacturer, but it should be interchangeable with any other 25Q40 memory of the same package.
I've created a YouTube channel for electronics and meter reviews - Page 1
Forum section: electronics / general

author: Perrin21
author_rank: Regular Contributor
timestamp: July 19, 2019, 09:15:21 am
content: Hi, I've been working on my UK based YouTube channel (oh no not another one I hear you cry). however I am trying not to make another me too channel (which isn't easy). is there anything you would like to see or any niche that you believe could be fulfilled that may win your support as a subscriber or viewer?I don't have much money and I know there are many more popular ways to get clicks and views with more popular mainstream content however, I am a geek and tbh I don't have much interest in mainstream content. The ideas I have so far are Fix at home, learning electronics, meter reviews, product reviews etc but I also have some random content ideas that could also help with some viewership. I'm not a marketing or influencer (hate that name) expert, just trying to use video to document my learning and hopefully help others. I'm also fairly broke at the moment and any small revenue this generates would be helpful though Im sure it will be more pennies than pounds. At this point YouTube won't even monetise my content as I don't have enough views lolif you are I terested, please take a look, I only started this recently so don't be too harsh.https://www.youtube.com/user/markperrin1ps, I've also managed to get an AVO835 multimeter to review and compare with the Brymen, hope some find that interesting.
Keysight Used: Discount for EEVblog members. - Page 1
Forum section: electronics / general

author: Brumby
author_rank: Unknown
timestamp: July 19, 2019, 05:18:16 am
content: I've only just noticed this (but then I tend to glaze over with Ads)...I know the EEVblog has good relationships with Keysight - but how long has this benefit been offered?

author: Towger
author_rank: Super Contributor
timestamp: July 19, 2019, 07:11:04 am
content: No excuse now Brumby, time to put the missus in her place and start spending :-)

author: Brumby
author_rank: Unknown
timestamp: July 19, 2019, 07:15:31 am
content: The bank account is the controlling parameter at this point.After that comes the "business" case.Thenwe'll worry about management....

author: BravoV
author_rank: Super Contributor
timestamp: July 19, 2019, 07:18:13 am
content: Quote from: Brumby on July 19, 2019, 05:18:16 amAs Murphy's law ... it will end right after you decided to pull the trigger.

author: Zucca
author_rank: Unknown
timestamp: July 19, 2019, 07:24:47 am
content: I don't know if the -10% still apply when you trade in somenthing. Probably not.
Holy crap, what would youe store on Amazon Web Services 100 petabyte Snowmobile? - Page 1
Forum section: electronics / general

author: BrianHG
author_rank: Super Contributor
timestamp: July 18, 2019, 06:37:10 pm
content: Amazon web services mass data transfer ain't fooling around...

author: tooki
author_rank: Super Contributor
timestamp: July 18, 2019, 07:24:05 pm
content: Odd for the TV host to call physical transfer “innovative”, though... online backup services have been doing the same thing for a long, long time, and I’m sure it’s been widely done in datacenter replication for decades.
Shedding light on why shipping on electronics from China is so cheap... - Page 1
Forum section: electronics / general

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 17, 2019, 07:59:40 am
content: You'd think that buying inexpensive electronics from overseas wouldn't make sense due to high shipping costs.I just found a video that explains why shipping something half-way around the globe from China is cheaper than shipping things across the country.

author: soldar
author_rank: Super Contributor
timestamp: July 17, 2019, 08:17:49 am
content: Previous thread:https://www.eevblog.com/forum/chat/countries-other-than-china-that-offer-outgoing-epacket-shipping/

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 17, 2019, 08:52:58 am
content: Quote from: soldar on July 17, 2019, 08:17:49 amYea but the video I posted goes a bit deeper. What if I'm in China and want to ship something as cheaply as possible? Video goes into how much it really costs, and how you can't just ship something from China using ePacket.

author: OwO
author_rank: Super Contributor
timestamp: July 17, 2019, 09:53:30 am
content: ePacket is reasonably priced and accessible to small volume customers:http://shipping.ems.com.cn/product/findDetail?sid=500033There isn't really a minimum quantity and they will open an account for you if you ship one a month. But yes, it's not for one-offs or personal use.
Super capacitor for "Obelisk of Light" type weapons ? - Page 1
Forum section: electronics / general

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 20, 2019, 04:05:29 am
content: I can't find a good clip of just the "Obelisk of Light", but there's lots of them in this video, starting around 0:22, the big red laser towersAny idea's on how to make 1 in real life for home defense ?

author: BravoV
author_rank: Super Contributor
timestamp: July 20, 2019, 04:12:39 am
content: Almost there, 1K post count ... keep going.

author: lordvader88
author_rank: Frequent Contributor
timestamp: July 20, 2019, 04:51:45 am
content: Getting cooked alive in a tank by that thing is scary.IRL, Hellfire missiles, what a name, if 1 hits you, it really is HellFire, if I was a tanker, I'd never want to be without air cover.

author: windsmurf
author_rank: Frequent Contributor
timestamp: July 20, 2019, 09:12:40 am
content: I prefer photon torpedos. Why can't they include that in Command and Conquer?

author: mindcrime
author_rank: Unknown
timestamp: July 20, 2019, 09:52:55 am
content: I dunno about an obelisk of whatever, but if you have a bunch of supercaps laying around, and some magnet wire, and some steel ball bearings, you could probably cobble together a passable coil-gun!

author: Psi
author_rank: Super Contributor
timestamp: July 20, 2019, 09:58:21 am
content: Might be able to make something that fires smoke rings and illuminates them with a laser.Probably the only way you'e going to make the laser visible.

author: MosherIV
author_rank: Super Contributor
timestamp: July 20, 2019, 05:12:36 pm
content: QuoteSo, you want to make a fictional device real.How about making hover boards from back to the future.

author: gnif
author_rank: Unknown
timestamp: July 20, 2019, 05:50:05 pm
content: Locking the thread