hybridfree/eevblog-posts huggingface dataset:
new phone charger with no leads - Page 1
Forum section: electronics / general

author: siliconmix
author_rank: Frequent Contributor
timestamp: June 24, 2012, 11:07:09 am
content: http://gizmodo.com/5920743/the-worlds-smallest-iphone-charger-skips-the-cables-altogether?popular=true

author: Stephen Hill
author_rank: Regular Contributor
timestamp: June 24, 2012, 02:22:36 pm
content: Doesn't look like there is alot of room for the electronics. I wonder what the maximum current draw is and how clean the DC output is...

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 26, 2012, 02:12:56 pm
content: Quote from: Stephen Hill on June 24, 2012, 02:22:36 pmand how good the isolation is....and how hot it runs....

author: Psi
author_rank: Super Contributor
timestamp: June 26, 2012, 02:41:54 pm
content: Yeah, for just $25 it's probably not going to be using a high spec 95% efficient SMPS IC.Probably only $5-10 worth of actual partsMaybe it uses the metal mains prongs as a heatsink, that would be an interesting approach.Mains socket and house copper wiring as heatsink

author: nitro2k01
author_rank: Frequent Contributor
timestamp: June 29, 2012, 01:25:09 pm
content: Dave, Mike, you know what to do...

author: tom66
author_rank: Super Contributor
timestamp: July 02, 2012, 12:15:38 am
content: I don't really see how this saves you from losing the charger, it's just got rid of the cable which you could have kept attached to it anyway... Why not just keep the charger plugged in? Standby power of most of these chargers nowadays is insignificant, measured in 10's of mW.
Mantis Elite - Page 1
Forum section: electronics / general

author: Roger Parsell
author_rank: Newbie
timestamp: June 27, 2012, 11:48:23 am
content: Hi Dave,Are you going to do a review of the mantis elite you had delivered the other day?I have wanted one for some time but I don’t know if they are good for electronics work.RegardsRoger

author: EEVblog
author_rank: Unknown
timestamp: June 27, 2012, 11:53:12 am
content: Yes, a review will be coming.I did an unboxing in the 300th live show.They are the defacto standard industry microscope for soldering and electronics work, perfect for the job. I've spent may hundreds of hours soldering under them and can vouch for their suitability. Nothing else matches them IMO. But the lens stop at x15, so if you need more than that for some reason, you'll need something else.Probably most of the their sales go to electronics work I would suspect.I like the x4 and x8 lens option combo.Dave.

author: Roger Parsell
author_rank: Newbie
timestamp: June 27, 2012, 12:18:44 pm
content: I should have watched the #300 show to the end. Sorry.Looking forward to the review.Congrats on the #300 show, keep it up.Roger

author: free_electron
author_rank: Super Contributor
timestamp: June 27, 2012, 01:20:49 pm
content: I got the original mantis with a super long working distance x8 and x4 lens.They are super machines.
A new "donated teardowns" idea.. - Page 1
Forum section: electronics / general

author: emberglow
author_rank: Newbie
timestamp: June 26, 2012, 11:06:20 am
content: I've just finished watching the mobile phone camera teardown, and enjoyed it thoroughly. Dave - how about making "donated teardowns" a regular weekly thing? I know, for myself, I have a load of stuff that could prove interesting fodder for examination - surely I'm not the only one. Your mailman might not appreciate all the extra packages, but could make for good video..Cheers from Alaska..~Julie

author: EEVblog
author_rank: Unknown
timestamp: June 26, 2012, 12:09:09 pm
content: Well, one persons "interesting" is not necessarily anothers!But yes, I'm happy to receive things for teardown, but can't guarantee that I will though.Dave.

author: Unknown
author_rank: Unknown
timestamp: June 26, 2012, 12:50:44 pm
content: Quote from: EEVblog on June 26, 2012, 12:09:09 pm"Don't throw away your old, dull and lifeless technology castoffs - Send them to Dave, and he can throw them away!"

author: Bored@Work
author_rank: Super Contributor
timestamp: June 26, 2012, 01:58:44 pm
content: Land fill Australia! They need it

author: Psi
author_rank: Super Contributor
timestamp: June 26, 2012, 02:03:40 pm
content: A data projector would make an interesting teardown. Lots of interesting optics, tiny motors, high voltage metal halide lamp driver etc.Just need to find a stuffed one.I have a really old data projector that has plug in cards and would be awesome to teardown, but it's still working and far to heavy to ship.It's a meter long!It's on its last legs though. I reset the lamp counter on the same lamp because a new one costs $4000!So it will explode eventually.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: June 26, 2012, 02:11:51 pm
content: Quote from: Psi on June 26, 2012, 02:03:40 pmno shortage of dead projectors on ebay.Here's a big one :

author: Psi
author_rank: Super Contributor
timestamp: June 26, 2012, 02:17:00 pm
content: Thats right, i did watch that a while back.Mine is about the same size but not quite as advanced, and it's LCD.It has a sort-of 5 module rack mount system running the entire length of the rear for various i/o cards which is quite interesting.
teardown or theroy of electronically controlled resistance source [ohm source] - Page 1
Forum section: electronics / general

author: croyleje
author_rank: Regular Contributor
timestamp: June 20, 2012, 08:17:52 pm
content: hi everyone,there is a discussion in general chat and the idea of seeing one torndown or at least Dave's ideas of how they work came up. its a ohm source, found plans on line that basically use lots or relays to shunt precision resistor but I don't think that is how it is down. would love to see in one and also think it would make a cool project would be nice to be able to type in needed resistance and out it comes.http://www.tequipment.net/IETOhmSource.htmlwould like to know your thoughts Dave.thanksJason
Electronic tutorial: Function Generator - Page 1
Forum section: electronics / general

author: Scarionn
author_rank: Contributor
timestamp: June 17, 2012, 06:18:54 pm
content: Hi Dave. I'm thinking why not build a function generator. You always said "A good function generator must have a modulation input" or something like that. So why not build your own function generator. I mean a analog one, with discrete components, a few op amps. Please give it a try.Bye, have a great day.

author: SeanB
author_rank: Super Contributor
timestamp: June 17, 2012, 06:26:42 pm
content: No market and new/used with much better specs are cheaper as they have volume production. For a cheap FG use a sound card, free up to 15kHz and arbitary waveform generation is there.

author: Rerouter
author_rank: Super Contributor
timestamp: June 17, 2012, 08:46:50 pm
content: and though you lack a modulation input, its far too easy to grab a stand alone dac module and hook it up with an encoder and lcd to your favorite micro, you get a wide frequency range, minimal issues on edge ringing etc, and you can do arbitary through your micro if your update rate is sufficient,however modulation is the hard part there, AM is fairly easy, you would just feed your input into a mosfet inline with the amplifier output, or sum into the amplifier op amp, FM though i dont quite know how that would be done,

author: codeboy2k
author_rank: Super Contributor
timestamp: June 18, 2012, 06:27:43 am
content: Quote from: Rerouter on June 17, 2012, 08:46:50 pmFM would be way, way, easy in your system, with a micro and DDS. Here's how it's done. It's not that complex.According to Wikipedia:If the baseband data signal (the message) to be transmitted isand the sinusoidal carrier iswhere fcis the carrier's base frequency and Acis the carrier's amplitude, the modulator combines the carrier with the baseband data signal to get the transmitted signal:In this equation,is the instantaneous frequency of the oscillator. See the wiki article for more details of FM, instantaneous phase, and instantaneous frequency.Ultimately, you continuously integrate the incoming signal, multiply it by 2*pi*the frequency delta(FM has a bandwidth delta above and below the center frequency), and add this as an offset to the base frequency to get a new frequency at that point in time). That new frequency is sent to the DDS, and it changes its output frequency.So you need an external integrator for the input signal, the micro uses it's ADC, get a digital value for the integrator output, multiplies it by 2*pi*deltaF, and adds it to the center frequency (Fc*2*pi) All that 2*pi stuff is just to convert frequency in Hz to radians/s. Internally you'd probably stay in radians. There's probably some details I missed, and the devil is in the details.and like I said, a micro + DDS chip is great at this.
Shoutbox - Page 1
Forum section: electronics / general

author: chrome
author_rank: Regular Contributor
timestamp: May 30, 2012, 11:55:46 am
content: Could you add a timestamp for the shoutbox? I never know if I can still respond or the comment was made a few hours ago.

author: DarkPrince
author_rank: Regular Contributor
timestamp: June 25, 2012, 12:37:42 am
content: The problem with this, which was brought up before if I am recalling, is time zones and related issues.To adjust this request, how about just the comment age, such that this post was 2m ago, or 2d, or whatever. No more precision than the most significant unit (s, m, h, d).

author: digsys
author_rank: Unknown
timestamp: June 25, 2012, 12:52:23 am
content: This poor donkey has been beaten to death a few times :-) There's been long(ish) discussions about time-stamping,even been reversed. Not sure how far back the shoutbox scrolls, but it's all in there.Maybe we need a shoutbox STICKY !!??Edit: LOL, just as I posted this I saw "The EEVblog LIOVE show will be starting in 20 min" from the boss himself.I take it back :-)

author: Rerouter
author_rank: Super Contributor
timestamp: June 25, 2012, 02:06:31 am
content: was it just me or, when set in profile settings the time stamps read correct to my local time?

author: EEVblog
author_rank: Unknown
timestamp: June 25, 2012, 02:23:42 am
content: Yes, this has been debated before. The time stamp used to be there but everyone asked for it to be removed!The "3 min ago" thing is a good idea, but that would require custom code. I do not know how to do this.It only shows the last 50 messages, the rest are dropped out the buffer file.The chat box is only a play thing, and not meant as a serious live discussion forum.Dave.

author: chrome
author_rank: Regular Contributor
timestamp: June 25, 2012, 08:45:06 am
content: But why not just add it? I mean what are the options that you can set and maybe we can have a vote then?Personally I would like a time, and as Rerouter says it probably automatically chooses your own settings.
Troubleshooting Devices - Page 1
Forum section: electronics / general

author: Ryu.Hayabusa
author_rank: Contributor
timestamp: June 13, 2012, 10:05:46 am
content: What about having a few blogs on how to troubleshoot something that isn't working properly? Or better yet, invite viewers to send stuff that isn't working or has some quirk and blog on the process of finding and fixing the issue.I'll be the first to send something since the damn manufacturer for my speakers refuses to tell me what component needs replaced in the subwoofer to stop this dreaded clicking/popping noise when the lights dim on the control pod.

author: Rerouter
author_rank: Super Contributor
timestamp: June 13, 2012, 12:40:20 pm
content: He has already done some troubleshooting videos, e.g. the quad copter one, and i would think veiwers sending in stuff would be iffy... most people would send in things like cell phones and speaker amplifiers such as yourself, while dave finds unique and obscure thing with the odd commercial product to keep things interesting,as for your speakers popping when you turn it off, its from the amplifier dumping its bulk capacitance through the speaker coil, most cheaper units, such as my own compupal speakers do it, the only easy way to modify it is to add a delayed off relay, where the contact opening on the pod rapidly turns off a relay in between the speaker output, and then a delay be it an op amp and RC time constant or otherwise to turn the amplifier off afterwards,

author: T4P
author_rank: Super Contributor
timestamp: June 13, 2012, 03:46:59 pm
content: Many people don't even see his videos and the quadcopter video was only recently ... and ask about troubleshooting ... that gets on my nervesIn any case the only hope for the pop in amplifiers are delayed start

author: Ryu.Hayabusa
author_rank: Contributor
timestamp: June 14, 2012, 04:49:05 am
content: Thanks for the tip, though this popping occurs while it's on, whether there is audio playing or not. It kinda sounds like if you were to pulse on the input every ~500ms.The control pod has a capacitive touch w/ light segments for the different inputs, volume, etc. When the lights dim on that pod after you stop changing settings for a few secs, it begins that pulsed popping. So far my fix has been to take off the capacitive input panel since the lights do not dim when it's not attached.My guess was a capacitor not filtering something it should be, however I haven't been able to test all the caps due to my multimeter not giving a reading on some.
Where did the drive-time rant go? - Page 1
Forum section: electronics / general

author: Mercator
author_rank: Contributor
timestamp: May 06, 2012, 12:48:05 pm
content: Hi,Ever since Dave became a full-time video blogger the drive-time rant / stream of consciousness disappeared. Wouldn't it be great to get that back again? I'm sure he has somewhere to drive to.I think he tried to do that with those walks in the park, but those seem to have disappeared, too.This could also be part of his attempt to add more regularity to the blog. Maybe every Friday or Saturday as some kind of "end-of-the-week review". Something like "Summary Sunday" or "Wining Wednesday".

author: EEVblog
author_rank: Unknown
timestamp: May 06, 2012, 12:53:51 pm
content: No reason apart from sheer laziness!I am liking the idea of regular episodes, so maybe a small regular walk-time rant might be in order.Dave.

author: Mercator
author_rank: Contributor
timestamp: May 07, 2012, 02:07:05 am
content: Great. Thank you.

author: vk6zgo
author_rank: Super Contributor
timestamp: May 07, 2012, 03:22:08 am
content: Ranting whilst walking in the Park may attract unwelcome attention from guardians of Law & Order!

author: Christopher
author_rank: Frequent Contributor
timestamp: May 07, 2012, 11:06:23 am
content: Or 13 year old kids calling you weird? Really did like the drive times, not just for the rant but seeing the beauty of Aus, much better than rainy Britain

author: Rerouter
author_rank: Super Contributor
timestamp: May 07, 2012, 11:58:31 am
content: or perhaps a fly-time rant with the quadracopterhavent heard much on that in a while

author: codeboy2k
author_rank: Super Contributor
timestamp: May 07, 2012, 07:11:11 pm
content: Quote from: vk6zgo on May 07, 2012, 03:22:08 amOr a lamp post will jump in front of you.

author: ftransform
author_rank: Frequent Contributor
timestamp: May 25, 2012, 05:26:15 am
content: can you keep a coherent rant together after some heavy exercise?this is starting to seem more and more a psychological experiment...*scribbles notes*

author: SgtRock
author_rank: Unknown
timestamp: June 14, 2012, 01:02:13 am
content: Dear Dave:--Walk time rant please, with a helmet mounted cam, and maybe just a few minutes of hand held shots of you wearing the helmet cam and talking. Or maybe a bike time rant, with steady cam, it would give you a place to put the camera, now that you have no more use for the pram, as of yet.--I would think the main advantage of the walk/bike time rant would be that you can gin up some good content, without too much preparation, or getting bogged down in equipment, and it is an efficient use of your time.P.S. Try to get Leo Laporte on the Amp Hour or maybe a simulcast. There is plenty of overlap for you guys to get into. And, I would like to see you get more exposure in the USA, we have a lot of geeks with time on their hands."Evabody gotta be some place."Jackie Mason 1936 -Best RegardsClear Ether
analog multimeter teardown - Page 1
Forum section: electronics / general

author: croyleje
author_rank: Regular Contributor
timestamp: June 10, 2012, 08:16:33 pm
content: how about a teardown Tuesday of an analog multimeter i think it would be cool to see the inside and especially the mechanical setups for the read out.thanksJason

author: EEVblog
author_rank: Unknown
timestamp: June 13, 2012, 06:03:53 am
content: I did that on one of my live shows I think. A Triplett 630Dave.
Show unread posts and sticky threads - Page 1
Forum section: electronics / general

author: Psi
author_rank: Super Contributor
timestamp: June 10, 2012, 06:08:49 am
content: Is it just me, or do new posts inside sticky threads fail to show up when you click "Show unread posts since last visit" ?

author: baljemmett
author_rank: Unknown
timestamp: June 10, 2012, 03:49:44 pm
content: Quote from: Psi on June 10, 2012, 06:08:49 amThey show up in there for me -- they stand out a bit in the listing, too, as they get the darker 'sticky post' background to their row.

author: billclay
author_rank: Regular Contributor
timestamp: June 11, 2012, 04:53:47 am
content: Quote from: Psi on June 10, 2012, 06:08:49 amThe "show unread posts since you last visit" feature leaves much to desire. I don't want to see the entire thread again, just the new posts!

author: Psi
author_rank: Super Contributor
timestamp: June 11, 2012, 05:49:50 am
content: Quote from: billclay on June 11, 2012, 04:53:47 amna, it would produce an insane amount of posts if it worked like that.For viewing this forum i really only use the 'show new posts' button and i think other people do as well.But i noticed replies to my post in a sticky thread weren't showing up.

author: billclay
author_rank: Regular Contributor
timestamp: June 11, 2012, 06:49:41 am
content: Quote from: Psi on June 11, 2012, 05:49:50 amI should clarify my original comment. I wish the function would show new posts only, as threads.
Adsense Warning - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: July 16, 2012, 06:51:32 am
content: I just got this email from Google Adsense:QuoteSo WTF am I supposed to do if they can't provide any info?I'm obviously not stupid enough to try and game the system!Dave.

author: TerminalJack505
author_rank: Super Contributor
timestamp: July 16, 2012, 07:08:07 am
content: I wonder if it is because a lot of people are using the Find Chips ad to find datasheets and such?

author: EEVblog
author_rank: Unknown
timestamp: July 16, 2012, 07:23:05 am
content: Quote from: TerminalJack505 on July 16, 2012, 07:08:07 amThe Findchips ad and search bar have nothing to do with Adsense.Dave.

author: Psi
author_rank: Super Contributor
timestamp: July 16, 2012, 07:25:33 am
content: What areas does adsense do, Youtube?

author: EEVblog
author_rank: Unknown
timestamp: July 16, 2012, 07:36:06 am
content: Quote from: Psi on July 16, 2012, 07:25:33 amYoutube, plus the ads in the text description for the first three posts at eevblog.com, plus various ones on my other sites.Dave.

author: DrGeoff
author_rank: Frequent Contributor
timestamp: July 16, 2012, 11:12:36 am
content: Could be some bots that are intentionally going around to annoy Google by generating clicks through popular sites.

author: Ferroto
author_rank: Frequent Contributor
timestamp: July 16, 2012, 01:23:00 pm
content: How on earth does google know if a click is invalid or not.

author: Psi
author_rank: Super Contributor
timestamp: July 16, 2012, 02:03:04 pm
content: Quote from: Ferroto on July 16, 2012, 01:23:00 pmI don't think they class individual clicks as valid or invalid. It's more that they look for unusual patterns/activity.I'm sure its quite complex and a combination of factors and statistics are used, but some examples might be..Large, out of the ordinary, spikes in click numbers.Lots of clicks from a single IP.Click count vs actual sales ratioEvidence of clicks repeating at a static rate.Clicks on ads where the connection is closed after the click and the linked page never gets to load.Unusual change in click distribution by country.Unusual change in click distribution by time.Unusual change in click distribution by browser.Footprint detected that corresponds to any known click hacking tools.Clicks on an ad not showing any increase in clicks on the resulting webpage ads (it's a chain of ads pointing to a website which has other ads etc.)

author: richcj10
author_rank: Unknown
timestamp: July 16, 2012, 02:50:21 pm
content: Google: " You are a bad person, I can't tell you why"....

author: Simon
author_rank: Unknown
timestamp: July 16, 2012, 03:29:04 pm
content: their methods of detection are obviously not that good

author: Mechatrommer
author_rank: Super Contributor
timestamp: July 17, 2012, 02:48:00 am
content: Quote from: Simon on July 16, 2012, 03:29:04 pmbecause the person(s) who made it are not that good. "all person", for that matter.
A more angry review style... - Page 1
Forum section: electronics / general

author: ftransform
author_rank: Frequent Contributor
timestamp: May 24, 2012, 09:32:46 pm
content: I think that dave should switch to a more angry review style for his future videos.Two things that come to mind:The guy from boston:And.The angry video game nerd.Let your feelings out dave.Can you guys even imagine that?

author: EEVblog
author_rank: Unknown
timestamp: May 24, 2012, 10:44:50 pm
content: Hilarious!I'm very careful not to drop the F bomb and get too angry, I could certainly outdo him if I wanted toDave.

author: caroper
author_rank: Regular Contributor
timestamp: May 24, 2012, 10:57:04 pm
content: QuoteI love that line, but with his version of PC one could question his definition of beaverSill it is interesting that he has been given a radio show. The Yanks may be PC but they respect freedom of speech.

author: ftransform
author_rank: Frequent Contributor
timestamp: May 25, 2012, 03:22:09 am
content: He is like a fat version of Joe Pesci.

author: obiwanjacobi
author_rank: Super Contributor
timestamp: May 30, 2012, 07:34:50 am
content: Nah, I prefer you express your frustration as you do now. Especially those phrases / expressions you use are great, more of those please. "better than sex on a stick" (what does that mean!? - I'm from the Netherlands, so...)As a general rule, people listen better if you keep it civilized. That doesn't mean you cannot occasionally...Love you show, Dave (I think blog doesn't really cover the entertainment value)...

author: EEVblog
author_rank: Unknown
timestamp: May 30, 2012, 07:52:23 am
content: I do have a rule about not dropping the F bomb on the blog. Pretty easy to avoid with editing, but slips through on some lives shows occasionally.Dave.

author: Short Circuit
author_rank: Frequent Contributor
timestamp: May 30, 2012, 09:28:04 am
content: Fat fuck from boston should stop complaining about gas prices and start walking.Note that aggressive style is reserved for people that don't do shit themselves, or are terribly stupid.'Value added' people tend to be a bit more carefull, as too much attitude may backfire.After all, everybody doing more than nothing screws up every now and then, really

author: codeboy2k
author_rank: Super Contributor
timestamp: May 30, 2012, 09:45:14 am
content: I am pretty sure it's his "act" ... i.e. a character he created.That said, he looks like Fred Flintstone to me
teardown - apple - Page 1
Forum section: electronics / general

author: matfox
author_rank: Newbie
timestamp: June 07, 2012, 11:42:53 pm
content: Some early apple computer teardown would be great

author: free_electron
author_rank: Super Contributor
timestamp: June 08, 2012, 04:14:57 am
content: nothing to teardown... apple 1 was a wooden plank with a circuitboard screwed on ..

author: EEVblog
author_rank: Unknown
timestamp: June 08, 2012, 04:20:53 am
content: Quote from: free_electron on June 08, 2012, 04:14:57 amNo, it was just a circuit board. BYO wooden plank!You'd think that for $666.66 they throw in the plank huh?If a mortgage my house again I can afford one for teardown:http://www.huffingtonpost.com/2012/06/02/apple-i-auction-sothebys_n_1562894.htmlDave.

author: free_electron
author_rank: Super Contributor
timestamp: June 08, 2012, 05:41:19 am
content: so it was overpriced from the get-go ...

author: codeboy2k
author_rank: Super Contributor
timestamp: June 08, 2012, 06:35:32 am
content: Quote from: free_electron on June 08, 2012, 04:14:57 amApple bonfire, anyone?
Old Computer - Page 1
Forum section: electronics / general

author: JoeAtl30319
author_rank: Contributor
timestamp: May 26, 2012, 06:37:21 pm
content: It would be pretty neat to do a tear down of an old computer. When I say old, I mean something like the apple II or an 80286, etc. There is typically a lot of pretty neat stuff going on in there...

author: rolycat
author_rank: Super Contributor
timestamp: May 26, 2012, 07:22:03 pm
content: This would be in addition to the 8088-based Tandy 1000 teardown Dave did in episode 32?...and the 80C85-based Tandy 100 notebook teardown he did in episode 116?

author: JoeAtl30319
author_rank: Contributor
timestamp: May 26, 2012, 07:28:29 pm
content: I must have missed those. I'll take a look. Thanks!
power generation from a 3 ph motor - Page 1
Forum section: electronics / general

author: mmknee
author_rank: Newbie
timestamp: May 21, 2012, 08:34:39 pm
content: I have seen on a few other sites, about using a 3 phase motor and a gasoline engine to create an emergency backup generator. I would love to see Dave do a blog on this, and how to rectify it use on such things as refrigerators, or TV's... just a suggestion! Thanks!
Suggestion regarding a mixed signal layout episode - Page 1
Forum section: electronics / general

author: elmohandis
author_rank: Contributor
timestamp: May 24, 2012, 01:28:33 pm
content: Hi Dave!Let me start off with thanking you for the great blog! I know you cannot cover everything, and that no one can please all tastes.However I would like to suggest that you do an episode regarding the PCB layout of a modern mixed signal design. Let's say interfacing an FPGA with a high speed ADC for instance. Your take on the layout of 16 lines of LVDS pairs , FPGA breakout and decoupling, and most importantly on how to best handle digital and analog ground issues would be very nice to hear.You once did an FPGA layout episode which was very very nice. This episode could be a sequel to that in some wayRegards

author: wosser
author_rank: Contributor
timestamp: June 15, 2012, 11:21:53 am
content: I'd be interested in this too, for sure.
Raspberry Pi  - Page 1
Forum section: electronics / general

author: Rellum
author_rank: Newbie
timestamp: May 09, 2012, 02:25:29 pm
content: Hello Dave and all , greetings from Brazil ! . Dave as you are one of the few guys that I trust and because you've have stolen a couple of my ideas , ok in fact I didn't tell anyone else besides myself and here in Brazil things are little more diffcult , ok that's another discussion , but congrats anyway for the good work and keep going. I prefer to see things materialized than on my mind... But pls as I said before you showed to be a trust-able pro and I would like a lot to see you reviewing this. It seems a great promise and revolutionary piece of hardware but I have my doubts if it is all that promises to be . As I don't have the resources (T&M(aka - time and money)) to do that and I trust in your judgments I think you are the right guy to replace me in that effort. Don't want to misjudge the other requests but I think this is one of the top requests around the forum . Just an idea of what I'm talking about :http://www.drdobbs.com/blogs/tools/232901444?cid=DDJ_nl_upd_2012-05-08_h&elq=6b11def2f6294cec937d2617d75caf1eBest regards...Fabio
auto electronics design - Page 1
Forum section: electronics / general

author: kaindub
author_rank: Regular Contributor
timestamp: May 14, 2012, 12:56:27 pm
content: DaveI really liked the amphour show where you talked about car electronics.I just replaced the alternator in my car (its a Merc), and the regulator is mounted on it.Uses a custom made regulator chip. When oyu flip the plastic cover you can see the silicon and the wire bonded connectionsIf you want this for a teardown, I'm happy to get it to youI'm in the northern suburbs of SydneyRobert
Spectrum Analyzer - Page 1
Forum section: electronics / general

author: JoeAtl30319
author_rank: Contributor
timestamp: May 17, 2012, 12:19:12 am
content: I have not seen a single review of a spectrum analyzer! Perhaps it might be good to do a review on a cheap one the average geek can afford. Perhaps the Rigol DSA800 series?http://www.rigol.com/prodserv/DSA800/

author: EEVblog
author_rank: Unknown
timestamp: May 17, 2012, 12:40:01 am
content: Rigol have promised me a DSA815 for sometime this month, so stay tuned!Dave.

author: rleyland
author_rank: Newbie
timestamp: May 17, 2012, 12:52:56 am
content: After playing with the Rigol 'scopes, and being quite impressed, I got one the spectrum analyzers a couple of weeks ago.So far its pretty good, oddly it didn't come with any test leads or pickups - I had to purchase those separately. It uses N-type connectors, and I had to hassle with adapters to get some nifty pickup coils to work with the device.I look forward to Dave's review as my experience is limited.cheers,Robert

author: EEVblog
author_rank: Unknown
timestamp: May 17, 2012, 02:13:05 am
content: By all accounts it's a real good value spectrum analyser. There is another thread on it here:https://www.eevblog.com/forum/product-reviews-photos-and-discussion/spectrum-analyzer-rigol-dsa815Dave.

author: JoeAtl30319
author_rank: Contributor
timestamp: May 17, 2012, 11:33:08 pm
content: Thanks! I look forward to the review. I won't have to sell a kidney for the DSA815.

author: Rerouter
author_rank: Super Contributor
timestamp: May 19, 2012, 11:20:35 am
content: my old dataprecsion spectrum analyser, is currently in in pieces waiting for me to repair the PSU, so i guess i could do a build up (in place of a tear down as its currently in pieces)also if i where to go and upload the manual here dave, it would become the only source of it on the internet :/
Teardown of a car alarm of the nineties - Page 1
Forum section: electronics / general

author: Galenbo
author_rank: Super Contributor
timestamp: April 21, 2012, 04:48:20 pm
content: Hello, a teardown of a car alarm of the nineties could be interesting.for example something like this:How does the ultrasonic detection work, what microprocessor is used, what chip is used for the remote control,how is the remote control receiver made, what kind of backup battery is used,...Basic electronics, but a nice combination.

author: free_electron
author_rank: Super Contributor
timestamp: April 21, 2012, 05:17:23 pm
content: Microprocessor ? Bwahaaaaaaa. You are lucky if it has 4 flipflops in it.Those things were typically built around some monoshots like 4538's an mm53200 did the remote controlcode ( you had to scratch or drill pcb traces to set the code )If the remote used infrared they were sometimes emplogin a tea5500 from philips.The siren was nicd and built with transistors. Not a chip in sight.Remote control receiver is a regenrative type built with 2 transistors and a seaw filter.The picture looks like an italian alarm made by Meta. When i was a kid 1988 and 18. A had a vacation job installing such things... I ripped a few apart. No smart stuff in there.The later ones started using a simple pic 16 series and employed keeloq rolling code engines.

author: Galenbo
author_rank: Super Contributor
timestamp: April 21, 2012, 07:38:06 pm
content: It would be nice to see a blog article on it. Whatever is on the inside.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: April 21, 2012, 07:58:14 pm
content: Yeah these were pretty crude, took far too long to incporporate remotes that couldn't be scanned or grabbed. Bit of a problem especiall when linked to central locking.I worked in a car audio shop when they were fairly new - a common prank was to sneak up behind someone with a self-powered sounder and let it off....Only differences in todays ones are rolling-code remotes, now at 432MHz instead of 418, using a 3V lithium battery instead of 12v alkaline, main unit MCU controlled with a few configurations possible via combinations of ignition and remote buttons, and ability to learn a few extra remotes.

author: T4P
author_rank: Super Contributor
timestamp: April 22, 2012, 12:55:28 am
content: Quote from: mikeselectricstuff on April 21, 2012, 07:58:14 pmAnd a massive price , but you forgot immobilizers .

author: free_electron
author_rank: Super Contributor
timestamp: April 22, 2012, 01:45:04 am
content: Quoteoh god yes the 1/2 aaa size 12 volt cells made out of unobtainium ...

author: SeanB
author_rank: Super Contributor
timestamp: April 22, 2012, 10:21:02 am
content: Those 12V batteries are common and cheap. 50c Us retail. Worst are the 7.5V remote batteries, those are difficult to find, and are $2 each.
New opening for EEV blog - Page 1
Forum section: electronics / general

author: JonnyBoats
author_rank: Regular Contributor
timestamp: April 05, 2012, 09:32:57 pm
content: I see Australia and New Zealand are considering adopting a common currency:http://www.telegraph.co.uk/finance/currency/9186360/Australia-and-New-Zealand-could-adopt-single-currency.htmlThis got me to thinking how assume it would be if Dave had some intro music for all the videos, perhaps something like this

author: Psi
author_rank: Super Contributor
timestamp: April 05, 2012, 11:58:18 pm
content: Are you trying to start a WAR! ?(Since your from USA I'll assume you're not aware.While NZ and AUS are really good friends, when it comes to sports we're both totally batshit crazy against the other side)Putting the NZ Haka on his Australian videos would be social-suicide

author: JonnyBoats
author_rank: Regular Contributor
timestamp: April 06, 2012, 01:24:37 am
content: NO war's please!don't put the Haka on the EEV Blog, I'm sure Dave could come up with something much better!

author: JonnyBoats
author_rank: Regular Contributor
timestamp: April 07, 2012, 12:54:18 pm
content: Uncle Vernon, thanks for that - that is a really funny video!It does give me an idea for an EEV blog episode though. In keeping with the motto: "Don't turn it on, take it apart!" perhaps we could have a segment involving a sheep and a barbie?
Cheap Digital Oscilloscopes - Page 1
Forum section: electronics / general

author: neilbus
author_rank: Newbie
timestamp: March 27, 2012, 01:52:03 am
content: Digital Oscilloscope ATTEN ADS1102CALI wounder if you could review the above oscilloscope made in China. It costs around 300 UK pounds. I am looking for a 100Mhz Digital Oscilloscope that is cheap and fully featured, which is reliable with good instructions if possible. In terms of cheapness around 300 to 400 UK pounds. Is the above oscilloscope any good.It is being currently being sold on ebay.RegardsNeil Bussey Bridlington UK

author: robrenz
author_rank: Super Contributor
timestamp: March 27, 2012, 02:41:51 am
content: Make sure you are in the top of the forum "EEVblog Electronics Community Forum" and search for "ADS1102CAL" You will get about 23 threads that mention it. You alslo may want to search for the Rigol DS1052E and DS1102E both very popular scopes on this forum. You must be at the top of the forum to do a complete search. It only searches the level you are on.
Measuring current to a  PWM device, RMS and other frequency related topics. - Page 1
Forum section: electronics / general

author: johnnyfp
author_rank: Frequent Contributor
timestamp: March 30, 2012, 09:07:10 pm
content: Hi,Be nice to have a blogg about measuring current(or apparent) to a pwm device, for example an led. Or RMS, watts and power.CheersJfp

author: Psi
author_rank: Super Contributor
timestamp: March 30, 2012, 09:49:46 pm
content: As i understand it, because its a square wave rather than a sine this is much easier to calculate.There are only two different 'levels' involved instead of an infinite number that need to be sampled and approximated to get the area under a sine curveie, If you have a 50/50 pwm signal, and the voltage is 12v into a 5R load. You can say the peak current will be 12v/5R = 2.4ATherefor, at 50/50 the average current will be 1.2A (2.4/2), So the RMS current will be 1.7A (1.2 * sqrt(2))Though i could be wrong. Someone check me.

author: AlphZeta
author_rank: Regular Contributor
timestamp: April 03, 2012, 02:50:55 pm
content: Hi Johnny,A while ago, I did some experiments on this very topic (http://www.kerrywong.com/2011/08/22/on-rms-voltage-measurements/) and it seems that most of the meters won't give you very accurate readings unless the meter is specifically designed for measuring PWM signals. You can take a look at the measurements I conducted and see how far the readings are off.Your best bet is probably use an oscilloscope.

author: Unknown
author_rank: Unknown
timestamp: April 03, 2012, 03:08:10 pm
content: It would indeed be easy with a scope, just duty cycle * peak current (no need for sqrt(2) fudge factors).Measuring PWM signals with a DMM may be an issue because either the relevant frequencies exceed the bandwidth of the meter (square waves have several odd harmonics), or because the signal exceeds the crest factor if the duty cycle is low. Low-pass filtering, and measuring the RMS value of the resulting signal, is also an option. This feature is available on some DMMs intended for the industrial market.
When will we see DaveCam on the air? - Page 1
Forum section: electronics / general

author: deephaven
author_rank: Frequent Contributor
timestamp: May 28, 2012, 08:44:34 am
content: Dave, I seem to remember you holding up a webcam some time ago. Are you going to install it at your workshop so people can keep an eye on what you're doing? I'm sure it would turn into a very popular Web TV channel.

author: EEVblog
author_rank: Unknown
timestamp: May 28, 2012, 08:58:20 am
content: That's the plan, it's still sitting on the bench waiting...Dave.
Suggestion: Instructional video for phase-locked-loops - Page 1
Forum section: electronics / general

author: avistel
author_rank: Newbie
timestamp: February 21, 2012, 01:18:42 pm
content: Hey Dave, I think that you have a way of explaining complicated stuff in a fairly easy-to-understand manner (the videos on chopper amps and choosing capacitors being one example).Can you do something similar to the chopper amp video on phase locked loops? As in, what they're used for, why they work the way they do, etc.Thanks in advance.

author: Joshua
author_rank: Regular Contributor
timestamp: February 21, 2012, 01:46:35 pm
content: Look at the YouTube channel...PhirePhly2007. He has an excellent intro to pll and an application demo.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 12, 2012, 10:10:25 pm
content: this is good
MFJ-259b Antenna Analyzer - Page 1
Forum section: electronics / general

author: JoeAtl30319
author_rank: Contributor
timestamp: June 02, 2012, 01:33:49 am
content: Exploring the insides of an MFJ-259b (or similar) antenna analyzer might be fun...

author: vk6zgo
author_rank: Super Contributor
timestamp: June 08, 2012, 01:31:52 am
content: I have taken the back of an MFJ-269 at work,as the "N" connector seemed a bit intermittent.I can vaguely remember one big board which was very difficult to remove,so I left it.Not a teardown,but this bloke has done a fairly in depth review:http://www.vk2zay.net/article/197He also has a repair on a MFJ-207,plus some other interesting stuff.

author: Zad
author_rank: Super Contributor
timestamp: June 08, 2012, 02:45:22 am
content: Those are pretty old technology now to be fair. I don't think Dave really does much RF work either, probably better to leave it to the many amateur radio sites. No short of strip-down photos and schematics on the web

author: Frangible
author_rank: Regular Contributor
timestamp: June 08, 2012, 03:00:11 pm
content: MFJ has always been known to Hams as Mighty Fine Junk. Of course, there are more profane versions of that, but they mean the same.

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: June 09, 2012, 03:31:31 pm
content: I have had several of the MFJ analyzers , all of them used , and the ones I kept & used were the 259 [ not a B ] , had to buy some parts from MFJ , then upgraded to the 269 again used , it had an issue , that I suspect was mis-handling on assembly .The variable cap - tuning nob , a couple of plates were making contact in one position , I used a toothpick to straighten out , while in there I found what looked like repairs / replaced surface-mount parts , they had excess solder & were mounted at odd angles , straightened those out also .I would also like to find better & correct schematic & calibration info .I think that for the price , they are OK and well suited for ham work .I have also picked a Timewave ,http://www.timewave.com/support/TZ-900/TZ-900.html, and very happy with it .It was also used and had an issue , but the company is local here , and met the owner many times at club meetings , field day - he always brings one out to help if needed , last yr we both noticed the issue mine had , he said bring it by to repair , I went to pickup , and there was no charge .I also have a used to me DSP 599zx , and watching for a used ANC 4 noise canceler .
SPice software blog - Page 1
Forum section: electronics / general

author: exodia
author_rank: Contributor
timestamp: March 16, 2012, 10:43:31 pm
content: Hey dave how about some tutorial on Spice specific software like LT spice

author: EEVblog
author_rank: Unknown
timestamp: March 16, 2012, 10:54:09 pm
content: Yep, I've been thinking about that one.Consider it on the cards.Dave.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 19, 2012, 01:48:57 pm
content: yes please
Manufacture of Printed circuit boards - Page 1
Forum section: electronics / general

author: G7PSK
author_rank: Super Contributor
timestamp: March 13, 2012, 06:44:52 pm
content: What I would really like to see is the inside of a pcb factory and how mullti layer boards are built up, Is this somthing Dave could arrange to do. I expect that us mere mortals would not be allowed in.
FPGA implementaion - Page 1
Forum section: electronics / general

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 11, 2012, 11:20:06 pm
content: this would be cool

author: olsenn
author_rank: Frequent Contributor
timestamp: March 12, 2012, 12:15:54 am
content: What are you talking about? An FPGA implementation for what?

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 12, 2012, 12:17:39 am
content: ways to use them .programming.i've only just heard they exist .

author: olsenn
author_rank: Frequent Contributor
timestamp: March 12, 2012, 01:16:34 am
content: Quote from: siliconmix on March 12, 2012, 12:17:39 amAh, we'll the most common ways of writing code for FPGAs are in the form of an HDL; most commonly Verilog or VHDL. Programming/debugging is typically done via JTAG.If you're not familiar with what an FPGA actually is, I'd recommend doing a Google search on it. In short, they are arrays of LUT's connected by programmable interconnects. Microprocessors contain a few functions (mnemonics) that can be used in succession to achieve a certain task, and FPGA's can do everything in a single clock cycle because you define the logic in hardware (you can create your own instruction set).

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 12, 2012, 11:15:16 am
content: thanks.yeah i did a quick search.i watched jeriellsworth playing with one but i just couldn't concentrate.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 12, 2012, 11:25:33 am
content: i see .so in effect these could be used to monitor events like the one in the pic and react , log stanalone from a pc.

author: joelby
author_rank: Frequent Contributor
timestamp: March 12, 2012, 01:25:20 pm
content: That looks like a low frequency spectrograph. There are plenty of alternatives to an FPGA if you want to analyse audio signals in real time, but you could certainly use an FPGA to do a fast Fourier transform in conjunction with an analog-to-digital converter, along with other digital signal processing steps.I think Dave mentioned that he isn't particular interested in HDL and FPGA implementation beyond board layout, but there are plenty of resources out there. You could try fpga4fun.com orFPGA Prototyping by Verilog Examples.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 12, 2012, 01:28:14 pm
content: will do thnaks
The Most Damning thing in Engineering IMO! - Page 1
Forum section: electronics / general

author: Richard Goodrich
author_rank: Newbie
timestamp: February 19, 2012, 04:41:36 am
content: To me the most damning thing in engineering is when something works for the wrong reasons! It leads you - especially the "new players" to wrong conclusions!And it is HELL to explain to management! Who think because it worked once it must be good practice. Like to hear Dave comment on how he has managed or FAILED like to me to handle this truth!

author: EEVblog
author_rank: Unknown
timestamp: February 19, 2012, 07:58:37 am
content: Yep, I've had that happen on quite a few occasions.More often though it is when something doesn't work (like an intermittent fault) and you find a entirely plausible culprit, fix it and then you don't see the problem again. So you think you've cracked it, and then management get a bit PO'd when the problem rears it's head again because it was something else (or another part of the problem) and Murphy is just screwing with you...Dave.

author: vk6zgo
author_rank: Super Contributor
timestamp: February 19, 2012, 08:50:33 am
content: Or when someone else finds a "plausible culprit",& is feted for the wonderful job they did,while you are still saying:"But,I don't think that is it!"You then become regarded as a "Naysayer",& frowned upon by Management.Your colleague goes on to greater things,& when the problem arises again & the so-called "fix" doesn't work.you get the blame!Management don't have a long enough attention span to reason through the sequence of events,so you still end up being regarded as the "incompetent whiner!"

author: EEVblog
author_rank: Unknown
timestamp: February 19, 2012, 12:11:40 pm
content: Quote from: vk6zgo on February 19, 2012, 08:50:33 amWhiner was my middle name!Dave.

author: SeanB
author_rank: Super Contributor
timestamp: March 04, 2012, 02:43:42 pm
content: Dave Whiner Jones, it just does not ring true...........All to easy to go down the wrong path and enter a world of pain.

author: T4P
author_rank: Super Contributor
timestamp: March 04, 2012, 05:16:28 pm
content: Like the "Flying Pig" Award of Dave Jones

author: mtkaalund
author_rank: Contributor
timestamp: March 10, 2012, 05:51:23 am
content: Quote from: vk6zgo on February 19, 2012, 08:50:33 amHe he, I had an experience as my first job, where I had to do the hardware to sniffing X10 components, and there was a problem the software engineer had, the timing was off, and he had sad to management that the problem lied in the hardware. So I looked in to the problem, and it was because of they taken the timing of a 60 Hz signal instead of an 50 Hz signal, even tough I had measurements that confirmed this, the management told me to fixed it in hardware.After two weeks I was branded as an naysayer and they finally fixed this problem in software, then it worked of course. But this was really an bad experience for me, and I learned that you need to get management on your side, before you can convince them of where the problem is.
ESD Varistors etc... - Page 1
Forum section: electronics / general

author: itdontgo
author_rank: Regular Contributor
timestamp: March 06, 2012, 09:54:30 am
content: Whilst on the subject of ESD, how about sharing your knowledge on TSDs (varistors and low cap zeners) etc...)I must be honest and say I'm not 100% sure on what is out there. I used datasheet recommended devices when designing for USB for simplicity.

author: T4P
author_rank: Super Contributor
timestamp: March 06, 2012, 05:44:07 pm
content: I believe you want TVS diodes , they are basically high power ( in a sense ) zener diodes .I believe they can suppress ESD , but yeah , varistors seem pretty cheap on taydaelectronics . ( Meh , looks rather wimpy )