hybridfree/eevblog-posts huggingface dataset:
tantalum capacitor? - Page 1
Forum section: electronics / general

author: Kopernik
author_rank: Contributor
timestamp: November 16, 2015, 04:51:22 pm
content: Hi!Is this maybe a tantalum capacitor?I believe that is 1uF 35V.what kind of case is it?

author: helius
author_rank: Super Contributor
timestamp: November 16, 2015, 05:07:46 pm
content: Looks like solid tantalum. Radial rectangular case, maybe CX06

author: Kopernik
author_rank: Contributor
timestamp: November 16, 2015, 05:45:52 pm
content: So I can replace it with any case tantalum cap?

author: Zero999
author_rank: Super Contributor
timestamp: November 17, 2015, 08:43:48 pm
content: Quote from: Kopernik on November 16, 2015, 05:45:52 pmOf course you can.

author: Stonent
author_rank: Super Contributor
timestamp: November 18, 2015, 04:08:42 am
content: Quote from: Hero999 on November 17, 2015, 08:43:48 pmAs long as the leads will fit.
Back to the future in actual 2015 - Page 1
Forum section: electronics / general

author: vulpine
author_rank: Newbie
timestamp: November 17, 2015, 11:05:56 pm
content: Saw this on youtube and thought of Dave. Sorry if you've already seen it.Back to the future in Actual 2015https://youtu.be/J4LI_EqnJq8

author: Stonent
author_rank: Super Contributor
timestamp: November 18, 2015, 04:08:12 am
content: Yeah that's about it.
VOLT – Electronic Component Selection Engine  - Page 1
Forum section: electronics / general

author: VOLT_SE
author_rank: Newbie
timestamp: November 17, 2015, 04:31:36 pm
content: We've been working on a new visual search engine for finding electronic components. Almost 30,000 manufacturers, 28m documents, 18m part photos.It's early beta and we are still some way off the complete functionality but feel free to have a play with it.http://www.volt.ac/
Probe compensation question - Page 1
Forum section: electronics / general

author: fubar.gr
author_rank: Unknown
timestamp: November 16, 2015, 04:51:26 pm
content: I've watched the excellent video made by w2aew here:I have a question that I don't think was properly addressed: At around 12:30, when adjusting the trimmer cap and the square wave becomes rounded, that's because higher frequencies are attenuated more than lower ones.Ok, that's pretty straightforward. But what exactly happens when he turns the cap the other way and the square wave becomes pointy? The voltage overshoots above and below the original 0 to 5 Volts of the test signal.What exactly causes this overshoot?

author: Stray Electron
author_rank: Super Contributor
timestamp: November 16, 2015, 05:14:28 pm
content: The center of a square wave is made of the low frequency, the corners are made up of the high frequencies. (Odd harmonics). The misadjusted probe that shows overshoot in the corners is over attenuating the low frequencies.

author: tggzzz
author_rank: Super Contributor
timestamp: November 16, 2015, 05:20:21 pm
content: Instead of the higher frequencies being subjected to positive attenuation they are subjected to negative attenuation, also known as gain. In other words the higher frequencies are emphasised.

author: fubar.gr
author_rank: Unknown
timestamp: November 16, 2015, 05:25:08 pm
content: Quote from: tggzzz on November 16, 2015, 05:20:21 pmBut how can a probe made of entirely passive parts add gain to a signal? Is it due to some resonant effect?

author: grumpydoc
author_rank: Super Contributor
timestamp: November 16, 2015, 06:07:11 pm
content: QuoteAll components are attenuated, but if the low frequencies are attenuated more than the high frequencies then there isrelative"gain" and you will get the peaking on the rising edge that you see in the video.

author: Someone
author_rank: Super Contributor
timestamp: November 17, 2015, 04:53:19 am
content: Quote from: fubar.gr on November 16, 2015, 05:25:08 pmThe overall impedance of the probe provides a 10:1 attenuation when attached to an oscilloscope, so the adjustment is a relative amount of loss. It needs a trimmer as each input on a scope (and different scopes) have slightly different capacitance, to make it easier the range of adjustment is small and each probe has only a range of oscilloscope input capacitances that it can be adjusted to match.
In case anyone missed XKCD yesturday... - Page 1
Forum section: electronics / general

author: jnz
author_rank: Frequent Contributor
timestamp: November 19, 2015, 12:14:33 am
content: http://xkcd.com/1604/Took me a second to get it, because I've only rarely used non-SMT resistors

author: rolycat
author_rank: Super Contributor
timestamp: November 19, 2015, 01:09:39 am
content: Deja vu...https://www.eevblog.com/forum/chat/xkcd-was-interesting-today/msg801371/#msg801371

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 19, 2015, 02:05:19 am
content: Quote from: jnz on November 19, 2015, 12:14:33 am

author: jnz
author_rank: Frequent Contributor
timestamp: November 19, 2015, 05:18:52 pm
content: Quote from: rolycat on November 19, 2015, 01:09:39 ammy badQuote from: crispy_tofu on November 19, 2015, 02:05:19 amYea... I know... I'm a relatively young, new to this, and have a budget large enough to prototype my designs on SMT usually. I mean, I get the resistor codes, I've just rarely had to use them. Much faster for me to just meter them.

author: Len
author_rank: Frequent Contributor
timestamp: November 19, 2015, 05:38:19 pm
content: Quote from: jnz on November 19, 2015, 05:18:52 pmBut, as this comic shows, knowing the resistor colour codes could save your life someday.

author: TSL
author_rank: Regular Contributor
timestamp: November 19, 2015, 07:55:07 pm
content: Quote from: Len on November 19, 2015, 05:38:19 pmTwo of the most dangerous snakes in Australia are 20 and 1Damn it!..... now everything I look at has a number
Researchers use COTS 3D printer to print new organs, could change healthcare - Page 1
Forum section: electronics / general

author: cdev
author_rank: Super Contributor
timestamp: November 15, 2015, 05:54:15 pm
content: Apparently, lives are already being saved by the use of some (other) 3D printed organs. This really is an amazingly helpful new development.3D Printing Breakthrough Could Change Healthcarehttp://www.eetimes.com/document.asp?doc_id=1328180&
Familiar functions missing from eevBlog forum. - Page 1
Forum section: electronics / general

author: vk6zgo
author_rank: Super Contributor
timestamp: November 15, 2015, 02:47:43 am
content: OK,don't nobody move!What have you done with the "Replies to your previous posts" & "New posts since your last visit" functions?I thought I had done something funny,so I logged out,& back on again,but sure enough,they're still gone.We can obviously live without them,but they do enhance usage of the site.

author: Deathwish
author_rank: Unknown
timestamp: November 15, 2015, 03:05:22 am
content: still there, you done what I did once ?, clicked the little white arrow in top right corner of forum header .

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 15, 2015, 03:07:38 am
content: Quote from: Deathwish on November 15, 2015, 03:05:22 amhehe +1, why is there even a button for that?

author: ataradov
author_rank: Super Contributor
timestamp: November 15, 2015, 03:45:02 am
content: Quote from: crispy_tofu on November 15, 2015, 03:07:38 amEven with this thing closed, the useful information begins at around 50% of my screen. With it being opened, useful information starts at 2/3 of the screen.
casio fx-9750g plus programs  - Page 1
Forum section: electronics / general

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 11, 2015, 10:52:12 pm
content: anybody know how to program this or know of any already made programs code that i can use ?

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 12, 2015, 02:10:44 am
content: This linkmight help, it's the programming section of the user guide.

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 12, 2015, 06:40:08 am
content: Quote from: crispy_tofu on November 12, 2015, 02:10:44 amty
Medium Wave (AM Radio) Propagation Characteristics - Page 1
Forum section: electronics / general

author: Halcyon
author_rank: Unknown
timestamp: November 11, 2015, 06:33:44 am
content: I often drive between Sydney and Canberra for work and I've noticed this week that many of the AM radio stations I listen to are reaching further than they previously have. We've had a bit of bad weather so I don't know if it's the cloud cover that has had an effect or if the broadcasters have changed something at their transmitter sites.For example: On 873 kHz, I would normally get a lot of noise and lose any useful signal around 60-100 kilometres from the transmitter site. On two occasions recently, I've been able to pick up a fairly loud and clear signal from ~200 kilometres away (that said, passing under any overhead high voltage transmission lines overwhelmed any AM signal).Same thing has happened on 576 kHz (ABC Radio National; they use a different transmitter site in Sydney). On ABC especially, I used to have to change between three different frequencies on the drive down to continue listening to that station. This afternoon, I could pick up all three from the Federal Highway.I should make note that on each occasion, I was driving during the day. I understand that atmospheric conditions at night often increase the range of low frequency broadcasts. How much of an effect does weather have on AM radio broadcasts? Will the cloud cover be reflecting a lot of the signal back down to earth at greater distances?
Electronic Gadgets  - Page 1
Forum section: electronics / general

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 10, 2015, 09:20:33 am
content: anybody know of any other gadgets like mobile phones Dictaphone voice recorders mp4 mp3 mp5 players cameras Electronic Dictionary translators pda's ectas i like playing around with Electronic Gadgets and collecting them and maybe there is something ive missed

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 10, 2015, 09:26:59 am
content: Calculators?

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 10, 2015, 09:24:53 pm
content: Quote from: crispy_tofu on November 10, 2015, 09:26:59 amthanks im supersized i missed them

author: Macbeth
author_rank: Super Contributor
timestamp: November 10, 2015, 09:46:00 pm
content: Poundland dick rings?

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 10, 2015, 10:17:40 pm
content: Quote from: Macbeth on November 10, 2015, 09:46:00 pmlol he goes into great detail about it
The end is nigh for Betamax - Page 1
Forum section: electronics / general

author: KJDS
author_rank: Super Contributor
timestamp: November 10, 2015, 06:13:38 pm
content: Sony will soon stop making the tapes.http://www.bbc.co.uk/news/technology-34776424I am not surprised at this, what really surprises me is that anyone has bought a betamax tape in the last 15 years

author: dr.diesel
author_rank: Super Contributor
timestamp: November 10, 2015, 06:24:37 pm
content: I was surprised to read this as well. Heck my VCR player hit the dump probably more than 10 years ago and it won the format war.Long live vinyl!

author: Ian.M
author_rank: Super Contributor
timestamp: November 10, 2015, 06:28:40 pm
content: https://en.wikipedia.org/wiki/BetacamIts not exactly clear from that typically wet and woolly BBC tech article what format tapes Sony are actually discontinuing. Some of the digital Betacam formats can use an ordinary Betacam cassette, and its quite likely that a few such cameras are still in service with impoverished 3rd world station O.B. crews and freelance cameramen.

author: daqq
author_rank: Super Contributor
timestamp: November 10, 2015, 08:58:20 pm
content: Wow... I'm surprised that they were in production that long. Honestly, I assumed that the last tape (any non-data) exited the factory 10 years ago.

author: calexanian
author_rank: Super Contributor
timestamp: November 10, 2015, 09:07:34 pm
content: Something tells me there will NOT be a ground swell of support and a new cottage industry like was the case with professional Reel to Reel tape a few years ago or records and record players some years before that.
Hedy Lamarr - frequency hopping - Page 1
Forum section: electronics / general

author: bigsky
author_rank: Regular Contributor
timestamp: November 10, 2015, 12:01:18 pm
content: This interesting factoid popped up in my Facebook feed:9 November 2015 marks the 101st anniversary of the birth of Hedy Lamarr, an actress and engineer who co-invented frequency hopping.Check out these links, and be sure to expand the text under the photo in FB.https://www.facebook.com/amightygirl/photos/a.360833590619627.72897.316489315054055/925896134113367/?type=3&theaterhttps://en.wikipedia.org/wiki/Hedy_Lamarrhttp://www.google.com/doodles/hedy-lamarrs-101st-birthdayI'm a huge advocate of equal opportunities, and it always encourages me to learn of people like this.

author: rolycat
author_rank: Super Contributor
timestamp: November 10, 2015, 12:14:58 pm
content: Already noted:https://www.eevblog.com/forum/chat/the-most-beautiful-electronic-inventor-would-have-been-101-years-today!/msg796673/Her achievements were also discussed on this forum earlier this year:https://www.eevblog.com/forum/chat/modern-technology-we-use-everyday-invented-by-hollywood-movie-star/msg600450/
the 'legitimate' Rigol license generation is borked... - Page 1
Forum section: electronics / general

author: agronaught
author_rank: Contributor
timestamp: November 10, 2015, 11:47:17 am
content: So we know the DSA815 'riglol' license generation no longer works on recent DSA815's with boot loader 00.01.04 Unfortunately this is what I have and I'm not keen on the idea of opening up the unit to apply the 'bridging' fix some people have resorted to. After much internal debate I've actually 'paid' for the VSWR license and received the 'Key' that need to be used to 'Generate' the actual license.This provides two sets of instructions for generating the required license.QuoteEh... it _may_ be there but I don't speak (or read) any of the languages normally used in china, and there doesn't appear to be an english site option. Maybe I'm missing something but 'I Dunno'. So far the appropriate page doesn't seem to be present.The second option:Quotereturns a '404' error, not goof Rigol.I have sent a request to both tech support and the company I bought the license from.If you actually want people to pay for this cruft:* Fix the pricing... I mean, really ?* Fix the process.../whinge over... Thanks for listening.note - through perserverance and some random link clicking I have since found the necessary page. For reference:http://www.rigol.com/CustomerService/ProductRight
p-Channel JFET negative GS-voltage - Page 1
Forum section: electronics / general

author: Grottenolm85
author_rank: Newbie
timestamp: November 09, 2015, 10:29:30 am
content: Hi,i want to use a J-FET to resuse a Header-Pin either as reset or as ground. The circuit is the picture.My Idea is:Normal Mode:S is connected to GNDG is connected to +5VUgs=5V -> JFet Pinching OffProgramming Mode:S is Connected to Reset from Debugger (Push_pull)G is Connected to GNDIf reset is active(low):Ugs=0V -> JFET is open -> Pull reset µC to gndIf reset is off high):Ugs=-3,3V -> JFET does what?The graph of the datasheet ends at 0V. As i see it a negative Voltage on the Gate should produce more holes in the channel and the conductivity should go up? Is this correct? Are there any nasty parasitic komponents in a JFET? from what i know there is only a p-dotted area around the gate? Shouldn't have any undesired effect?An insight from an silicone expert?Thanks..

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 09, 2015, 11:05:35 am
content: Typical JFETs are symmetrical, i.e., there is no identity to source or drain.How can you tell what it's doing, then? Simple: the source is whichever pin has the higher voltage. (Or for N-channel,lower.)So you've actually got a source follower, and will need quite a bit more voltage than you think.Are you not simply trying to drive the reset pin? Why not use an open collector or open drain (NPN or N channel) switch?!P-JFETs are extremely rare (still available, in a few flavors -- but not thousands as with BJTs and MOSFETs), and should have absolutely no place in a design unless there's a very good reason to use them!Tim

author: Grottenolm85
author_rank: Newbie
timestamp: November 09, 2015, 11:34:39 am
content: Thanks for the hint about the S and D. Shouldn't change anything for the function though?On my connector i've got two pins, lets say Pin a and bDuring normal operationpin a=5Vpin b= GndDuring Programming:pin a=0Vpin b=ResetSo how can i switch the function from GND to reset? The only indicator that i am programming is the missing 5V on pin a.How is a circuit with a pnp supposed to work?

author: Zero999
author_rank: Super Contributor
timestamp: November 09, 2015, 12:55:27 pm
content: Quote from: T3sl4co1l on November 09, 2015, 11:05:35 amP-channel JFETS are very common, just look at the input stage of any BiFET op-amp.Just playing, I know you were talking about discrete components!

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 09, 2015, 02:46:07 pm
content: Why do you need anything at all?Tim

author: Grottenolm85
author_rank: Newbie
timestamp: November 09, 2015, 07:34:16 pm
content: What?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 10, 2015, 01:33:02 am
content: I mean, connect programmer RST to MCU RST? Or with a diode (to preserve open collector type drive)?Tim
Step-by-step circuit solution generator - Page 1
Forum section: electronics / general

author: MONODA
author_rank: Contributor
timestamp: November 11, 2015, 04:10:57 am
content: Hey everyone, I've been working on a web app that will generate the step by step solution to a circuit problem that you give it. Right now, it will take a netlist as input and determine the node-voltage equations and solve the system of equations. In addition, it will generate problems for you to solve and then guide you through the solution.I have yet to launch it but if you are interested, feel free to add yourself to the mailing list here:http://solved-problem.launchrock.com/
The most beautiful electronic inventor would have been 101 years today! - Page 1
Forum section: electronics / general

author: ErikTheNorwegian
author_rank: Frequent Contributor
timestamp: November 09, 2015, 03:49:43 pm
content: Hedy Lamarr born Hedwig Eva Maria Kiesler, 9 November 1914 – 19 January 2000)Animated Google Doodle celebrating the 101st birthday of Inventor and Hollywood star, Hedy Lamarr.Was an Austrian and American film actress and inventor. After an early and brief film career in Germany, which included a controversial love-making scene in the film Ecstasy (1933), she fled her husband and secretly moved to Paris. There, she met MGM head Louis B. Mayer, who offered her a movie contract in Hollywood, where she became a film star from the late 1930s to the 1950s.She was the inventor of Frequency-hopping spread spectrum in 11 August 1942 ! its the basis of todays for modern spread-spectrum communication technology, such as GPS, Bluetooth, COFDM (used in Wi-Fi network connections), and CDMA (used in some cordless and wireless cell phones)!https://en.wikipedia.org/wiki/Frequency-hopping_spread_spectrum

author: miguelvp
author_rank: Super Contributor
timestamp: November 09, 2015, 04:56:51 pm
content: You sure she was Austrian and not Australian and a member of CSIRO?I kid, I kid.

author: SteveLy
author_rank: Regular Contributor
timestamp: November 09, 2015, 05:14:51 pm
content: Austrian or Australian, she was amazing, and there was a great radio tribute to her on the Australian ABC Radio National Science Show last year (click the pic for link):

author: LaserSteve
author_rank: Super Contributor
timestamp: November 09, 2015, 05:25:12 pm
content: That goes down as best Goggle doodle ever. Great production values.Steve
The low-tech explanation thread. - Page 1
Forum section: electronics / general

author: Circlotron
author_rank: Super Contributor
timestamp: November 09, 2015, 09:10:32 am
content: Sometime we see something running and we instantly imagine there is some insanely complex and sophisticated technology behind it all. Later on we discover things are somewhat cruder than we first imagined...Back in 1981 I bought this record player turntable that had a sinewave oscillator -> small power amp -> synchronous motor. The blurb proudly trumpeted "FG servo". Lah-de-dah! Anyway, if you let your finger drag on the periphery of the platter you could see the stroboscope pattern on perimeter slow down, pick up, then stabilise at the original speed. Conversely, if you then let it go it would speed up momentarily, then back off from this overshoot back to normal speed. I was envisioning all kinds of proportional, integral and derivative loops doing their stuff in a speed feedback loop. Oh, the ecstasy of it all! Then one day I realised there was no control theory magic going on at all. It was simply the rubber belt that couples the motor to the platter stretching as it got loaded, and springing back with with contraction (the overshoot) as the load was released. How embarrasment.Surely others have seen similar.
Bicycle wind cellphone charger - Page 1
Forum section: electronics / general

author: LukeW
author_rank: Frequent Contributor
timestamp: November 08, 2015, 07:50:00 am
content: http://interestingengineering.com/diy-bicycle-cellphone-charger/What do you think? Plausible or bullshit?Personally I don't think so.A more traditional bicycle wheel dynamo combined with an appropriate regulator would be more plausible.Let's assume perfect Betz limit efficiency for a wind turbine, assume circular cross section at r = 50mm, cyclist speed at 15 km h-1, air density at 1.225 kg m-3P = (8/27) * 1.225 kg m-3* (15 km h-1)3* pi * (50 mm)2= 200 mW.Can you charge a cellphone with 200 mW? Even if you cycle several times faster than that, say 1.6W at 45 km/h, since it scales as v3, still seems like you're really pushing your luck - and this is making huge generous assumptions about the efficiency of this system.

author: djQUAN
author_rank: Frequent Contributor
timestamp: November 08, 2015, 08:34:52 am
content: Not to mention cogging. It would take a strong wind to start the turbine. Unless, you have to flick the turbine to start it... While the bike is moving.this made me laugh inside.http://www.instructables.com/id/5-Bicycle-Cell-Phone-Charger-Wind-Turbine-with-bui/step6/Waterproofig/The energy you can harvest with a small turbine is indeed quite small but he does use a battery to store the energy then use it all once to charge a phone. Although I have not done the math on how long it would take to refill the battery from empty but I'm guessing - a long time.

author: amyk
author_rank: Super Contributor
timestamp: November 08, 2015, 02:35:07 pm
content: http://www.cas.mcmaster.ca/~rzheng/course/CAS765fa13/CH10.pdf200mW may just barely charge an older smartphone or a dumbphone, but could be close to the idle power consumption of a newer one with some apps running in the background.

author: Halcyon
author_rank: Unknown
timestamp: November 09, 2015, 04:31:37 am
content: Are (i)phones these days really that terrible that we need chargers everywhere we go? How about Apple and the rest make less-crap phones at the expense of stupid curved screens and the never ending quest for "thin-ness".
Discharge Lamp Voltage Rating - Page 1
Forum section: electronics / general

author: kolbep
author_rank: Frequent Contributor
timestamp: November 08, 2015, 12:08:46 pm
content: Hi All,I am getting 2 intelligent light fittings that use 575w discharge lamps.I know, everybody says go for LED fittings, but because these fittings are discontinued, and their bulbs have burned out, I am getting them at a steal.Now, the specs for the replacement Lamps are :Code:Lamp: 575W dischargeApproved models: Philips MSI-575/HR (1000 hr; 6000K)Philips MSI-575/2 (1000 hr; 6500K)Osram HMI-575/GS (750 hr; 6000K)Now, If I look at the specs for the Osram Lamp, it showsQuoteThis fitting has a Magnetic Ballast in it. Now I am wondering about the 95V Lamp Voltage.I know the Ballast Limits the current, does it do that by limiting the Voltage?So, will this bulb be suitable to run on 230V using the choke that is in the fitting {IOW does the choke cause the voltage to be within the lamps limits}?As these bulbs are a bit pricey locally (South Africa), I thought I could just get one or 2 of the R300.00 (20USD) ones from Ebay. Even though it might take 2 months (or never) to get here. As long as the voltage thing works out.

author: SeanB
author_rank: Super Contributor
timestamp: November 08, 2015, 01:52:04 pm
content: Yes, the ballast inductance limits the current to the lamp, which is the important thing. The voltage will be 95v over a very large range of current once the lamp is lit, though it will increase with lamp aging till it is so high that the lamp cannot generate enough internal heat to keep the gas fill ionised, which results in the familiar cycling of the lamps as they age, though these typically do not cycle for long, they tend to have such a high internal pressure and power dissipation as they age that the arc tube bursts at EOL, so make sure you use either protected lamps with an internal glass blast shield, or never use the fitting if it is missing the outer tempered glass protection. Sadly the lamps are not long lived, the 1000H runtime is going to go fast if left on, and they are also limited in the number of ignition cycles, and typically need to cool for 20 minutes after switch off before you can restrike, though if there is a superimposed ignitor in the fitting ( has 2 connections to the ballast, and a single high voltage isolated output to the lamp and a neutral connection) it can restrike a hot lamp in around 10 minutes after turn off.When buying the Ebay ones be wary of the Chinese manufactured ones, they might not be the best quality. With SAPO at it's current dysfunction you might want to see if the seller offers Fedex or DHL as a shipping option, they often do do that, though you will get bent over again when they show up at your door. R1600 delivery fee........ps If you are looking for 150W R7s MH lamps I have a few that I bought for R5 on auction. Only got one display light fitting a few weeks ago for R100, so lifetime supply of lamps for it.
Clean / chaoticly organised lab? Which is yours? - Page 1
Forum section: electronics / general

author: Weistek
author_rank: Contributor
timestamp: November 08, 2015, 03:38:12 am
content: I can never seem to keep my lab/office clean, either there are multiple projects going on or too much bench equipment (one can never have too many scopes right?) To be sorted etc.So how do you organize your lab/work area?I'm just curious I've always thought of myself as a chaoticly organised individual, I always know where something is but the second I clean the lab i can't find it.Plus I like to see what other people's labs look like.Here's a pic of my work area in my lab, thus is after a project, the lab explodes...Sent from my SM-G920T using Tapatalk

author: Weistek
author_rank: Contributor
timestamp: November 08, 2015, 04:01:32 am
content: Quote from: wilfred on November 08, 2015, 03:57:10 amThanks I must have missed it.Sent from my SM-G920T using Tapatalk

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 08, 2015, 04:51:57 am
content: Don't forget to check out this onehttps://www.eevblog.com/forum/chat/whats-your-work-benchlab-look-like-post-some-pictures-of-your-lab/msg661483/#msg661483
iPad sized power bank - 300,000mAh?! - Page 1
Forum section: electronics / general

author: sammyhwang
author_rank: Contributor
timestamp: November 07, 2015, 12:05:55 pm
content: Slightly smaller than an iPad.A lithium-polymer power bank, marked at... 300,000mAh.At 3.7v that would be 1110 Watt Hours!To put things in perspective, this pretty common 18650 Li-Po battery is 12.58WhThat's 88 of those 18650 batteries. Should be around 3.8 kilograms.What, am I to believe 88 of these batteries + a solar panel would fit in that?It's not news that Chinese manufacturers have been marking up batteries, but this is by far the craziest, thought this would be worth sharing.

author: Cubdriver
author_rank: Unknown
timestamp: November 07, 2015, 03:50:36 pm
content: Maybe they are using the lower case 'm', which we're interpreting to mean milli instead as an abbreviation for micro, which also begins with m. The devil is in the details. Or, using Occam's Razor, they're just plain flat out lying.-Pat

author: amyk
author_rank: Super Contributor
timestamp: November 07, 2015, 04:28:40 pm
content: 300Ah in a cell of that size would definitely NOT be a good idea to short out...

author: rx8pilot
author_rank: Super Contributor
timestamp: November 07, 2015, 05:21:12 pm
content: I hope no one takes that on a commercial flight.Sent from my SAMSUNG-SM-G890A using Tapatalk

author: djQUAN
author_rank: Frequent Contributor
timestamp: November 07, 2015, 05:33:39 pm
content: I made one with about 180,000mAh* and it was pretty big. Granted I used LiFePO4 cells*If all cells were all wired in parallel for a 3.2V pack

author: Ian.M
author_rank: Super Contributor
timestamp: November 07, 2015, 05:50:35 pm
content: Quote from: amyk on November 07, 2015, 04:28:40 pmQuote from: rx8pilot on November 07, 2015, 05:21:12 pmThat's 100 KJ/gram, and Dynamite only releases 75KJ/gram. ISIS probably cant get enough of them!

author: Stonent
author_rank: Super Contributor
timestamp: November 08, 2015, 04:22:48 am
content: How about more like 23,000mAh?http://www.amazon.com/Poweradd-Apollo-Pro-Multi-Voltage-Compatible/dp/B00F4KBA3M/ref=sr_1_5?ie=UTF8&qid=1446956439&sr=8-5&keywords=19v+power+bank

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 08, 2015, 04:48:48 am
content: Quote from: Ian.M on November 07, 2015, 05:50:35 pm*unleashes the power bank**the sky turns red**helicopters fall from the sky*

author: peter.mitchell
author_rank: Super Contributor
timestamp: November 08, 2015, 05:09:16 am
content: using nissan leaf cells you're probably lucky to get 60-90ah @ 3.7v in that formfactor.

author: GK
author_rank: Super Contributor
timestamp: November 08, 2015, 06:32:10 am
content: Quote from: amyk on November 07, 2015, 04:28:40 pm
300gb hdd repairing sectors - Page 1
Forum section: electronics / general

author: sony mavica
author_rank: Frequent Contributor
timestamp: November 07, 2015, 03:24:09 am
content: how long would it take using PartitionGuru 4.6.1 Professional Edition to repair the sectors on the hdd that got corrupted as it does not give an estimated timewould it be longer then say 5hrs? i don't really want to start the process right now if its going to take hrs and hrs

author: kc8apf
author_rank: Regular Contributor
timestamp: November 07, 2015, 05:02:52 am
content: Depending on how many sectors are bad, it can take days. By corrupted do you mean that bad data was written to them or that the sector fails to read? The latter is rarely recoverable. Tools can likely repair the partition tables and filesystem metadata but the actual data for that sector is gone.

author: Psi
author_rank: Super Contributor
timestamp: November 07, 2015, 05:09:30 am
content: I've had luck using spinrite to recover data from damaged areas.It can take days though.
Hope I am not giving away one of Dave's secrets (from his past life) - Page 1
Forum section: electronics / general

author: ez24
author_rank: Super Contributor
timestamp: November 06, 2015, 05:28:14 pm
content: Dave has a Kindle book if you are getting bored here:http://www.amazon.com/The-Internet-Dating-David-Jones-ebook/dp/B004MDLVAOAnd it has GOOD reviews !This along with member Al's profile picture should keep us busy(thanks Al - it all started because of you)I believe this is legit - if not I will get this down ASAP and will not be offended if removed

author: Ryano
author_rank: Regular Contributor
timestamp: November 06, 2015, 05:38:08 pm
content: You're all good. He mentions it, with a link no less, in the "About" section of the EEVBlog.

author: Mark
author_rank: Frequent Contributor
timestamp: November 06, 2015, 07:09:20 pm
content: ...waiting for threads asking "Book on internet dating or DS1054Z??"...

author: ez24
author_rank: Super Contributor
timestamp: November 06, 2015, 09:46:33 pm
content: Quote from: Mark on November 06, 2015, 07:09:20 pmFor a successful date you need to bring along a DS1054Z
404 / 403 Errors - Page 1
Forum section: electronics / general

author: JoeN
author_rank: Frequent Contributor
timestamp: November 05, 2015, 10:24:41 pm
content: Seems like the board was down several hours last night. Last night by my watch, about 16 hours ago? This happened a few days back as well. Is the board being attacked or just some technical issues?

author: marshallh
author_rank: Unknown
timestamp: November 05, 2015, 11:09:23 pm
content: Read thishttps://www.eevblog.com/forum/news/test-ignore/60/

author: JoeN
author_rank: Frequent Contributor
timestamp: November 06, 2015, 12:04:58 am
content: Quote from: marshallh on November 05, 2015, 11:09:23 pmQuote from: dr.diesel on Yesterday at 10:33:48 PMQuote from: firewalker on Yesterday at 10:27:57 PMWhat was the complaint for?Alexander.If I was a guessing man, probably firmware files posted to forum threads.Nope. Someone wanted their quoted posts on the forum removed.Dave should get a new host. One somewhere that doesn't give a flip about DMCA requests.F*ck the Americans and the DMCA. I say this even though I am an American.
Anybody remember Singer Instrumentation? - Page 1
Forum section: electronics / general

author: vk6zgo
author_rank: Super Contributor
timestamp: November 05, 2015, 02:16:07 pm
content: The Singer family seem to be extraordinarily productive in the fields of Industry & Technology.There are the Sewing Machine ones,way back,there were Singer cars,but the mob I am asking about made Electronic Test Equipment.Back in the day,at least in the PMG's Dept/Telecom Aust,their stuff was nearly as common as HP & Rohde & Schwarz,particularly among the RadioComm crowd.They seem to have sunk with nary a trace---never seen on eBay,nobody seems to have any of their spectrum analysers,etc.I never used it myself,but it looked to be the same standard of quality as HP,R&S,& the other high end stuff.Has anybody ever owned any Singer Test Equipment?

author: alsetalokin4017
author_rank: Super Contributor
timestamp: November 05, 2015, 04:03:14 pm
content: I have an old Singer-Sensitive Research high-voltage voltmeter (ranges up to 15 kV or maybe 30 kV). Unfortunately it is up on a shelf that is blocked with other stuff and I can't get to it without cleaning up the lab... so that's not going to happen unless I really really need to use it for something.Googling it leads me to a blurry image of it from one of my videos!

author: AF6LJ
author_rank: Unknown
timestamp: November 05, 2015, 04:06:40 pm
content: Sure do remember them.I used a singer signal generator at a two way shop I worked at part time.It was an HP-8640 clone.

author: Bassman59
author_rank: Super Contributor
timestamp: November 05, 2015, 05:29:35 pm
content: Quote from: vk6zgo on November 05, 2015, 02:16:07 pmThe Singer company was also into motors and such; all of the Black and Decker tools used to use Singer parts.They also got into aerospace, and merged (bought?) Kearfott in New Jersey a few decades ago. Then it was bought by a corrupt corporate raider called Paul Bilzerian (who later went to jail, he was that bad). Ancillary businesses were shed to pay the debt incurred. Singer Electronic Systems, the aerospace component, was sold to Plessey in the UK, which was then absorbed by GEC, which was then taken over by BAE Aerospace.

author: Davesaudio
author_rank: Newbie
timestamp: November 05, 2015, 07:56:06 pm
content: I do remember the Singer communications monitor in the two-way radio shop (summer job).

author: IconicPCB
author_rank: Super Contributor
timestamp: November 05, 2015, 10:11:39 pm
content: I have a Singer Alfred Oscilloscope 8000 main frame with a Singer Alfred Sweep analyzer model 7051 with a photocopy of the manual.In essence a display section and a control section consisting ofa dual channel logarithmic amplier and reference attenuator set in need of an external RF sweeper.
Site Reliability - Page 1
Forum section: electronics / general

author: PedroDaGr8
author_rank: Super Contributor
timestamp: November 05, 2015, 01:47:56 pm
content: Anyone else been having issues with Nginx 404s on this site? Had one again yesterday for the most of the day.

author: fivefish
author_rank: Frequent Contributor
timestamp: November 05, 2015, 02:17:00 pm
content: I take advantage of site downtime as time to finally be able to do some real work.

author: Jeroen3
author_rank: Super Contributor
timestamp: November 05, 2015, 03:29:21 pm
content: Dave, you should get pingdom to get at least a bit of data regarding downtime.Midnight wake-up text service is optional.Here is the free version, which they hide very well.https://www.pingdom.com/free#signup
bench magnifier - Page 1
Forum section: electronics / general

author: Deathwish
author_rank: Unknown
timestamp: November 04, 2015, 03:47:01 am
content: the title may not be apt, but I was thinking of whether it would be of any use putting together a 3d type magnifier for the bench, 3 usb or cctv type lenses one directly overhead and one to each side all focused at a specific point or even self adjusting to focus. would it give depth etc to the screen ?. it is not my type of thing but hey ho

author: Deathwish
author_rank: Unknown
timestamp: November 04, 2015, 04:11:02 am
content: Fair enough. Oh well it was just an idea.

author: pickle9000
author_rank: Super Contributor
timestamp: November 04, 2015, 04:23:10 am
content: this kind of rig for experimenting with.http://www.aliexpress.com/item/Best-Price-Black-Universal-Virtual-Reality-3D-Video-Glasses-for-3-5-to-5-6-inch/32283007713.html?spm=2114.01020208.3.47.z9ilqa&ws_ab_test=searchweb201556_9_71_72_73_74_75,searchweb201644_5,searchweb201560_9

author: Deathwish
author_rank: Unknown
timestamp: November 04, 2015, 04:27:09 am
content: possibly, I was thinking more in terms of a large monitor on a wall. Maybe even 3d glasses would do there too .
LSi /3ware / avago Poor thermal performance or clueless techsuport? - Page 1
Forum section: electronics / general

author: kingofkya
author_rank: Regular Contributor
timestamp: November 03, 2015, 07:35:45 pm
content: Or both?SO i don't deny the controller is running hot it defiantly is but there airflow figure seams to be off by quite bit.A reply from them.QuoteIts running in a server chassis with 3 of thesehttp://www.nidecamerica.com/fanpdfs/v80e_a5.pdf73cfm each onesJust as a sanity check there number is way off right? Or do i not understand something about cfm?This is not the first time one of there cards has had thermal issues on there 3ware 9750 cards someone though it was a good idea to stick a lithium battery above the ram and blocking the bath of air over the cpu i am sure you all know what happens when a lithium battery gets hit with heat 2-3months was the avg lifespan.

author: Little Brutus
author_rank: Unknown
timestamp: November 03, 2015, 08:16:18 pm
content: Raid adapters can run hot. You say your case has 3*73 CFM (cubic feet per minute) fans. That is 219CFM. Less than their recommended 300.In addition, those 219 would be for the whole case and cooling everything.I had a similar issue with an Adaptec 6805.My solution was something like thisThats not the actual one I used, but the idea is to force additional air over the heatsink.

author: dr.diesel
author_rank: Super Contributor
timestamp: November 03, 2015, 08:21:52 pm
content: Much of that stuff was designed to run in full server chassis with an army of 10,000RPM fans.On my IBM M1015s I replace the stock low profile heat-sink with one that has the same foot print, but 4x taller. Matching the mounting holes is not required, just use heat-sink glue.

author: Towger
author_rank: Super Contributor
timestamp: November 03, 2015, 08:33:56 pm
content: As Dr. D. An army of fans, running at full speed in a line the width of the case would be common enough in highend rack servers.Not something you want to listen to. .

author: dr.diesel
author_rank: Super Contributor
timestamp: November 03, 2015, 08:48:35 pm
content: Here is a recent example of one I modded, I cut the ears off of course:

author: kingofkya
author_rank: Regular Contributor
timestamp: November 03, 2015, 11:33:26 pm
content: Yeah in this case it acceley is in a 2u server chasse that basicly has one fan dedicated to the card.And it is in a datacenter that run the cold isiles at 70-68FI just find it kinda pathetic that they undersized the heatsync that much on what is a $500+ cards.This really sucks if the thermal issues are that bad we have a few hundred servers with this cards at this point.
Burning Amp event, this coming weekend (oct-17, sat, redwood city, calif.) - Page 1
Forum section: electronics / general

author: linux-works
author_rank: Super Contributor
timestamp: October 13, 2015, 03:27:59 pm
content: this weekend is the DIY audio annual event known asBurning Amp(sample photo from the 2009 event; someone's interesting spkr build project)its where the audio audio crowd gets together to show what they have designed, built or modded over the last year. we didn't have an event last year so this is 2 years worth of pent-up hacking that needs to come out in the open and show itselfI will be giving a half hour talk on my arduino remote control project that I've been working on, quite heavily, over the last year. my talk is at 10am - attendance and parking is free and the 'show network' of audio gear is sure to have many things there that are worth seeing and hearing.this is not a commercial vendor event; its all about DIY and self-made audio stuff. it has a very unique feel to it.hope to see some of you there.cheers,Bryan Levin (aka, linux-works, sercona audio)links:http://www.stereophile.com/content/burning-amp-rekindles-next-saturdayhttp://www.burningamp.org/http://www.diyaudio.com/forums/clubs-events/277751-burning-amp-2015-schedules-info.html#post4404110previous show write-ups from stereophile magazine:http://www.stereophile.com/content/burning-amps-slow-burnhttp://www.stereophile.com/content/burning-amp-sizzles-san-francisco(and yes, I was written-up in both of those stereophile online articles, plus one paper-printed edition)

author: German_EE
author_rank: Super Contributor
timestamp: October 13, 2015, 07:48:41 pm
content: Oh my, that sounds like fun!!

author: linux-works
author_rank: Super Contributor
timestamp: October 18, 2015, 11:01:10 pm
content: link to the slides I used for my presentation (pdf):(Arduino-based-Remote-Controls_final.pdf)http://www.netstuff.org/ba_2015/Arduino-based-Remote-Controls_final.pdf

author: kc8apf
author_rank: Regular Contributor
timestamp: October 19, 2015, 01:02:57 am
content: It was a pleasure meeting you there Bryan. Thanks for posting your slides. I didn't get there until after noon and missed a few talks including yours.

author: linux-works
author_rank: Super Contributor
timestamp: November 03, 2015, 03:26:40 am
content: video is now online:thanks to linear systems for doing the recording an upload.(I'm not great at public speaking, but hopefully the material and demos might be useful).
Signal Private Messenger - Encrypted Cross Platform Messaging - Page 1
Forum section: electronics / general

author: LabSpokane
author_rank: Super Contributor
timestamp: November 02, 2015, 11:13:59 pm
content: https://whispersystems.orgFor those of you in the UK, you might want to download this while you're still able. It might not matter if they make you hand in your current smartphones, but it might be worth a shot.This particular system appears to be well-vetted by Ed Snowden and others. The code is open sourced as all good encryption should be.

author: Halcyon
author_rank: Unknown
timestamp: November 03, 2015, 09:27:08 am
content: I like the new version. Far more integrated than the old TextSecure. Whisper Systems have been around for a while. Their products work quite well.

author: HighVoltage
author_rank: Super Contributor
timestamp: November 03, 2015, 01:36:06 pm
content: I can only recommend this as well.For all sensitive stuff I have been using it.This is what "Trillian" used to be for the PC
Bedpan  vs  bedchamber  and microcontroller uses for the disability wanted - Page 1
Forum section: electronics / general

author: ez24
author_rank: Super Contributor
timestamp: November 01, 2015, 08:01:56 pm
content: Bedchamber is not a common word in the US and it means bedroomWhen I first read the title of thishttp://ijircce.com/upload/2014/april/19_AZigbee.pdfmy brain read "bedpan" not "bedchamber"So I glanced over the article seeing temp, light, and fan. Then I tried to figure out what the temp of poop had to do with anything. Light maybe turn off and certainly a fan but temp ? I thought maybe they wanted the temp to go down before an alarm went off. Or a high temp meant there was something there. ??After reading the article and finding no "empty pan" feature I went back to the title and read "chamber" not "pan" and then looked up the word "bedchamber" and found out it is a bedroom.Well anyway if you have gotten this far, do you have any micro-controller projects to help the disability you would like to share ? Or disability projects that you would like to see.thanks

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 02, 2015, 04:50:27 am
content: Who even uses the word 'bedchamber'? Even Google says it's archaic...

author: amyk
author_rank: Super Contributor
timestamp: November 02, 2015, 08:20:49 am
content: The writing style of that article seems like it was deliberately verbosified(?) to make it look longer and more complex than it really is.Some fun quotes from there:QuoteQuoteQuoteI mean, do you really need a whole paragraph to describe how a keypad works?

author: briselec
author_rank: Regular Contributor
timestamp: November 02, 2015, 08:38:55 pm
content: I've recently been trying to think of ways electronics could help those with Parkinson's Disease. Haven't come up with anything yet.

author: Ryano
author_rank: Regular Contributor
timestamp: November 02, 2015, 08:43:33 pm
content: Quote from: briselec on November 02, 2015, 08:38:55 pmNo worries..... Someone else already did.https://www.liftware.com/

author: ez24
author_rank: Super Contributor
timestamp: November 02, 2015, 08:52:53 pm
content: Quote from: Ryano on November 02, 2015, 08:43:33 pmInteresting - I think it is a gimbal device, no mention of batteries but highly rated and expensivehttp://www.amazon.com/Liftware-Starter-Kit/dp/B00JDSIOJE/ref=sr_1_1?s=hpc&ie=UTF8&qid=1446497393&sr=1-1&keywords=liftware