EEVblog
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- เผยแพร่เมื่อ 10 ก.พ. 2025
- Mailbag time.
Forum: www.eevblog.com...
SPOILERS:
Atom Bombs Book: amzn.to/16dicgg
Making of the Atomic Bomb Book: amzn.to/1BRSYwW
The Bruces Monty Python Sketch:
• Video
Ideal diode (synchronous rectifier) datasheet: www.linear.com/...
Car ECU teardown
PAL to RGBS converter teardown
Pump controller teardown
Meet Edison Educational Robot: meetedison.com/
Casio FX790P scientific calculator pocket computer: www.rskey.org/C...
PAL/NTSC decoder: pdf.datasheetca...
Digilent ChipKIT WF32 www.digilentin...
Digilent Basys 3 Artix-7 FPGA Demo Board
www.digilentin...
EEVblog Main Web Site: www.eevblog.com
The 2nd EEVblog Channel: / eevblog2
Support the EEVblog through Patreon!
/ eevblog
EEVblog Amazon Store (Dave gets a cut):
astore.amazon.c...
Donations:
www.eevblog.com...
Projects:
www.eevblog.com...
Electronics Info Wiki:
www.eevblog.com...
Hi Dave:
Your interest in Atom made me remember my Cousins work a Los Alamo's N.M.. He invented a fast camera that would take pictures at the rate of over a million frames per second. His name is Willard E Buck. The camera was used to take pictures of the explosion. One camera was a bit to close so it melted. The other work. The basic design is a spinning three faced mirror. Driven by two tiny turbines made by a machinist who worked at the Bureau of Standards unit in Bolder Colorado. They were driven by compressed gas. They spun up so fast the it passed the sound barrier. The two turbines each produced seven and one half horse power. So the light comes in through one compound lens. The mirror is at the focal point. The light is moved around a large thin cylinder that held 35 mm film in place. The light moved with the film stationary.
The camera that this one took the place of had some 300 lens according to Willard.
This camera still exists. The owner has completely digitized the whole thing. He is noted for his pictures of lighting. There is an article about him in one of the National Geographic Magazines.
Willard has many patients to his name. Look him up.
18:50 The moment I heard 'pal converter' I thought ooh ooh, I bet there will be a delay line in there! (learned from the camcorder teardown and subsequent review of the delay line)....
Opened it up and bam...there it is!
Dave...you taught me something months ago and it stuck!
@Lan Party Hosting "I am become Death, the destroyer of worlds."
+EEVblog I actually prefer Rhode's follow-up tome called 'Dark Sun'. That is an absolutely FANTASTIC book Dave - I have four different copies - and highly recommend it. Although something tells me you probably have already read it!
One you might not have come across is 'The Plutonium Files' By Eileen Welsome and is also worth your time. The writer is clearly anti-nuclear and she is very alarmist in her editorializing. However, the actual historical facts and research are amazingly interesting. I have been nuke-obsessed since I was a kiddie in 1981, genuinely petrified and listening out each day for the four-minute warning to go up - and there were a few things in there which I had not heard about before.
You mentioned before that you have been to England in your travels. If you ever head up here again you should take the time to go look at RAF Fylingdales on Fylingdales Moor. One of the major world-wide components of the early warning system is up there - an immense solid-state electronically scanned phased-array radar installation. If/when the balloon goes up we'll get the warning from there first - in Britain at least! Admittedly it was more visually arresting before the old 'Golfballs' were demolished, but its still worth the trip. You can even fit in a quick pass of Menwith Hill at the same time!
The temperature variation in Minnesota from record high to record low is 97 degrees celsius.
You are one of the few youtubers to shoot high frame rate footage. What a lovely donation you got to keep doing it.
EdFact: The sound sensor they mention in "modern cars" in the manual to Edison, is call a 'knock sensor'. Signal from the knock sensor is fed to the ECU to monitor ignition timing / firing of the spark plug.
You get used HP z820 barebone workstations. The 2nd revision (make sure you get one of them) also supports the v2 Xeons. These are absolute workhorses. You should get an entire machine incl. ram for about $800.
Thanks for tearing down my ECU Dave, great point about the free-standing components.
I forgot to mention that these are mounted inside the car, maybe that's how they get away without conformal coating and a tighter chassis.
Thank you Bruces, Dave.
This Minnesotan winter has been pretty mild as of yet, avg of -16c by my memory. I have heard of registered tempurature differances across the state swinging as wide as 100f over the course of a day. Cold here in the north, hot down in the south (Rochester)
When too many days pass with no EEVblog in my TH-cam feed I tend to get depressed. There should be a warning sign for newcomers about the withdrawal symptoms that will last a lifetime :)
Another great video Dave really do enjoy your videos as I'm disabled and really look forward to them many thanks from the UK .........
Thx love hearing From you. Big up From Montréal
Dave is right about coming through Australia's customs with any type of nuts. Back when I came on trip a few years ago I had a bag of trail mix in my carry on. They had dogs running up and down the line and when it got to me it went absolutely crazy I thought I was going to be arrested or something.
Just bought myself a TRS-80 PC-6 from eBay based on this video. :) Can't wait to tippy-tap some BASIC into the little guy!
I got three Edison robots. Each performed completely differently. One did just like yours in that it kept going in a circle. None handled the obstacle avoidance very well out of the box. I haven't had a chance to try programming them yet.
I had to open up one of them because it wasn't making good electrical contact with one of the motors. They use just pressure to hold them in place.
So good idea, but execution is a bit lacking.
Pete Brown Ah, ok. Mine seemed ok. You'd think they'd all perform identically, it's two motors and micro after all!
About the lego thing, a lot of patent/legal stuff ran out a while ago, so you can now be "lego compatible" without much fear, not so a couple of years ago
Wow! I have the Tandy version of the Casio FX-790P! I never knew they re-branded it.
Nice mailbag Dave. Thanks.
Hi Dave. I work with pumps and you do occasionally see Multitrode controllers. It uses multiple electrodes (multitrode) and different depths in the water and uses the waters conductivity to complete the circuit between the common electrode and the various depth sensors. They use these instead of float switches which aren't as reliable as the cable insulation breaks down eventually and the micro switch in them does fail occasionally.
The Shawshank Redemption should have clued you to the pronunciation :-)
I was just about to go to bed. Guess I have to stay up another 40mins. Damn you Dave!!!
If you ever get the chance Dave, you should visit the Titan II Missile Museum just south of Tucson Arizona. I think you'd find it quite fascinating.... The Top To Bottom tour is definitely the way to go!
39:39 The last patents on the LEGO dimensions elapsed in 1988, so any company can make products that have studs or holes that are compatible with the LEGO bricks. Many did though that didn't stop LEGO from continuing to sue manufacturers that just made bricks based on "trademark". (they were OK with companies having products LEGO wasn't making themselves but had LEGO connectivity).
A final ruling in court in 2010 allowed even making regular bricks, citing that you cannot trademark a technical function (the brick interlocking). So since 2010 several companies have made bricks.
Yeah, Hasbro has their KRE-O brand that says on the package "Works With Major Brands". Those came out in 2011, which is pretty much in line with the ruling.
That square routing is absolutely beautiful. I've never seen anything like it.
The mosfet rectifier was indeed designed to have heat sinks on them. If it is actually required, depends on the mosfets internal resistance and on the current drawn from the output.
Fun fact: I showed the video to my dad and he said: Hey, that Casio calculator is almost the same as the one I threw out recently....
What are the small holes all over your pcb? Assembly test points? Thanks
St0RM33 No, those are via's. It's where the copper on the bottom connect to each other. I put in quite some to ensure a decent current capability. The pcb should be able to do 15A or something like that.
I understood that they where vias but didn't pay attention to the design of the board. I though it was two layer specifically because of the circuitry. Thanks!
So, when are we going to see an "EEVblog DIY mini nuke project"?
There is a large stump in my yard that needs to be removed and a small nuke ought to do the job :)
My brother built a Mini-ITX system with a Xeon E3-1220 processor in it last year. His decision to go with a Xeon was the fact that Intel was doing away with virtualization extensions in the Core I7.
Great Mailbag!
My step-Dad used to work on those Nuclear Devices. I wonder if that book has him in there.
Linear's parts are soooo expensive. Also, we found one which has a faulty design.
I used to work for a Panasonic authorized service center. Matshushita is the original name of Panasonic's parent company. They recently changed their name to Panasonic. Sort of like GM changing their name to "Chevrolet" or something.
It's pronounced Maht-shush-ta. (rough, it's difficult to indicate the Japanese pronunciation.) Somehow the "shit" is silent. A former colleague's last name is "Yamashita." Funny, our company's E-mail filter "shit canned" my e-mails to him because of those 4 letters. It's pronounced, "Yam-ahsh-ta" Romanjii pronunciations are often strange, with many silent syllables.
I miss working with the Japanese.
21:32 the white stuff on the ground is clearly sand desposited after a storm
South Africa's Custom inspects every incoming package. Only ever had one package denied. You did not say, but going by Stefan's name, I would guess it was from South Africa.
Lego's patent expired ages ago. As long as the bricks dont actually say "LEGO" on them, its no problem.
I also want to know what processor that ECU is running.
how complex is the firmware and what architecture does a car engine controller use?
I need to find myself some PCB design software to run on my IBM 5150...
Square traces...never seen that before.
i heard legos patent expired, and last year i saw 4 or so different brands of brick kits in target for sale. so might be quite easy to make things compatible these days.
Love the back to the future car
Intel Xeon E5-2630 v2 $500 each used - what US government or corporate "dumpster" did he get those from?
Winston Smith I don't want to know!
EEVblog ;-)
lego brick pin spacing is free to use. which is pretty spectacular.
For those in Australia, don't you just hate when the road gets covered in like 15 inches of snow, and the trucks plowing the streets, angle the plow in a way where it ends up piling like 4 feet of snow in front of your driveway that you then need to shovel a path through before you can leave for work?
Snow? What's that?
Australia not Austria. And yes here in Austria we have a few inches of snow :D
Dave,
I would like to see more repair and troubleshooting videos if you can fit them in.
thanks.
Notice the FTDI chip on the BASYS 3 next to the mini USB port.
Edit: Micro USB
one of the more interesting/odd things i enjoyed playing with was a loran c, ceramic chips all socketed, multiple boards, water tight, heavy.
1:02 You'll love Utsuho Reiuji
97c temperature swings, summer engine compartment near 90c, winter -20c
Stephen Woods Ah, right, I wasn't factoring in the engine compartment.
***** You got that right! Brrr!!!
EEVblog you didn't need to. I've done many a Subaru engine and trans swaps, with associated wiring, and as far as I know, these ECMs are mounted in the passenger footwell of the car, not in the engine compartment. You were right on though, they're built pretty well down to a price. I also work on BMWs and it's shocking how many corners Subaru cuts on their electronics and how massively advanced BMW seems to be in comparison.
Guys, I'm not trying to be a dick here but I see this way too often lately... Why are americans / native english speakers more often than not skipping the '°' (degrees symbol)? Units of measurement shouldn't be context sensitive. 100C means 100 Coulomb (electrical charge) and 100F means 100 Farad (electrical capacitance) but I'm pretty sure everyone on this channel knows that. I would really like to know why this is so common in informal english writing.
Oh and while I'm on that matter: I just can't get over the fact that in formal (scientific) english 'V' stands for both voltage AND volume. In Germany for example we use 'U' for Voltage and 'V' for Volume, so there is no redundancy. (i.e. in english 'R=V/I' could be interpreted as 'resistance equals volume over current' which would be nonsense)
John Ridley I have to apologize. I had no idea that the QWERTY layout doesn't include the degrees symbol. From now on it won't bother me anymore if people just skip it and you are awesome for trying to compensate by using an asterisk! Now I just need an equally satisfying answer to the voltage vs. volume problem. Is the upper case 'U' already used for something else?
oooh I was about to sleep, then I refresh and this pops in my sub box!
Dark Sun by Richard Rhodes is one of my all time favorite books.
69 bucks is easy too expensive for that chipkit. Considering you can get an ESP8266 and an A7 for 20 bucks.
dave, try using a good video card for video processing. I use the GTX970 CUDA for rendering video. It halved the time it requires to encode a clip.
he did, look back to a few videos ago he bought that same graphics card and it made his video rendering actually slightly slower, it only helps for specific software and specific codecs.
Hi Dave, Love the videos - thanks.
I'm a broadcast professional. I don't know any broadcasters outside of maybe Japan using 50p, it is overkill for your audience.
I would say very few people can either see or appreciate the difference. iPads or laptops won't display it. Every extra hour you spend in post production lessens your profit.
Cheers - Pete
50 fps*
Peter Moore Say that to the thousand of people who have commented on the big difference from 25fps.
EEVblog They could be "videophools". In a double blind test they probably couldn't tell the difference :-)
ib9rt I think even a blind person could tell the difference.
I think the high framerate videos are beautiful! They feel more fluid. Anyone telling you there's no difference is using the wrong browser, or not downloading the videos at full resolution and framerate and viewing them in a proper media player on a big screen with zero chance of buffering (like me! :)
Whatever motherboard you go with for that rendering rig go for a Supermicro brand board. They are the only company that makes good dual processor boards that are atx/eatx. The X9DRI is cheap (at least here in America) and probably overkill for what you need.
The Lego bricks patent expired in 1989 so they are able to use the blocks.But using the name Lego is another issue.
What are the small holes all over Stephan's pcb? Assembly test points? Thanks
Vias that connect the top and bottom plane to slightly improve current capacity and thermal dissipation. They are plated through during the manufacturing process.
*****
lolz
so, packages housing fragile components should probably have 'fragile' written on every side of the outer packaging.
Great video Dave! Very informative. Thanks.
I know you can use audio via headphone jack to send data, but since when can you SEND audio/data audio via the headphone jack to the computer?
Stefan is missing some mounting holes on his MOSFET Rectifier board.
***** Yeah, that could be. But it's also one of the most common beginner mistakes when designing PCBs.
That knife xD
You sir... are a true Australian.
Hi Dave. you are correct about that automobile device. I used to work for automotive company and that kind of design is not acceptable. all bigger parts must but glued it is not possible to be like than freely standing. as you said vibration would damage it so no that is not good design also i didn't see any seal or conformal coating.
Do a mailbag week!! every day a short mailbag video to get through all your mail :D
Dave, about the french name that you pronounced wrong: you should watch the movie ‘Shawshank redemption’. The main character has the same name (Dufresne).
When it comes to automotive ,cheapest is best attitude is how they make things
The electrons will just fly off the corners lol died laughing
I know this is about 12 months late, but those 2630v2's will still kick the shit out of a 5960x for things like rendering due to the massive core count.
Fat man was the plutonium device. Little boy was a gun type uranium fission device. Just to clarify for intrested players
Oops you got it right dave I spoke too soon. Good on ya sir
such non electron-friendly boards in there !
Hi Dave, I'm one viewer from Costa Rica. Love your videos.
Oh snap, someone sent you a thousand dollars worth of processors. What awesome fans.
I'm sure this is way too late, but the core i7-4770k & up will outperform this chip in all but the most heavily multi-threaded applications, even at their stock clock speeds. Fortunately, with their unlocked multipliers, they also have a great deal of overclocking headroom. I'm running a 4770k, which is normally clocked @ 3.5 GHz, at 4.4 GHz using a Noctua air cooler and a bunch of big, slow-spinning 120 mm case fans. I only had to bump vcore up to 1.25 volts to get the system rock-solid stable under 100% load.
If you're interested in the automotive tech I could probably send you a couple immo/ecu modules from various models. I'm a locksmith so only really interested in the immobilisers but some have quite interesting designs like Mercedes Bosch ecus reclaiming injector opening current to open the next injector.
Does your rendering computer not have a separate GPU to help process video editing?
Dave did a video about that, and there was no difference in speed between cpu and gpu rendering.
Is that same cpu not running an OS as well?
BashMonkeyRC
Yes, but even if gpu rendering helped, Dave uses Handbrake before uploading his videos to youtube so a better cpu is a better option for him.
That Subaru ECU, are those mounted inside the car or in the engine bay?
Inside the car, under the dash in the middle :)
I had assumed as much. Given that is is inside the cabin of the car, there really isn't a need for it to be conformely coated right?
Mine's on the passenger floorboard, under an aluminum cover. (2003 Imprezza)
All the Subarus I've swapped have had the ECM mounted in the passenger footwell. Dave is right though, they're pretty cheaply made, but that applies to much of Subarus electronics. When I work on my BMWs I'm amazed how much more advanced they are than Subaru for the same time period. Subaru is literally 20+ years behind. Oh well.
Holy shit Dave those Intel e5-2630v2's are worth around $800 EACH!... check it out on eBay.
According to Wikipedia, a person from Hong Kong is a Hongkonger or Hong Kongese
"University program" :D Where's the poop, Mr. Wong?
If you or any Digilent affiliates are reading this, can I order a Nexys3 from a local recognized reseller here in Europe and _still_ have my purchase be conform the university program policy? Resellers don't seem to offer that I've noticed.
I could order it from the US, but shipping would just as easily take a big bite out of the reduced price :(
i7 is faster in SINGLE THREADED operations. Those two XEONs are faster in MULTI THREADED operations (like video rendering).
Also buy a SuperMicro. They are great and pretty cheap.
I recommend you the Supermicro X9DAi board. It has all the features you need - It supports DDR3 non-ECC RAMs, has a sound card, has SATA III/6Gbps, has 3 16x PCI-E slots.
Your power supply will BE enough to power this thing, you do not need a new one. However, you need a reduction from Molex to 4/8pin CPU power connector. Those boards require 2 4/8pin CPU power connectors. Also check that you can fit the board into your chassis.
You're forgetting that the ivy bridge v2 E5's turbo-mode much faster than the sandy bridge variants.... we have both the sandy and ivy version of the 2630 and the fact that the v2's can turbo mode to 3.1ghz (on all cores!) is a massive improvement over the old version which could only turbo to 2.8ghz at the most on 1 or 2 cores only... the performance difference is huge. IPC is also slightly better on ivy-bridge. So this wasn't a case of someone handing down their old stuff, but a legitimate assist to David.
We use Supermicro boards everywhere in production, you cannot go wrong with such a solid board. The X9DAi is a rather large board though, so for something that is guaranteed to still fit in his current case the X9DRL series is a better choice. As for non-ecc support, DDR3 ECC-registered 1600mhz modules aren't that much more costlier than bog standard stuff.
Also iicr those xeons are hyper threaded, so each processor has 6 cores but 12 threads, so a total of 12 cores but 24 threads
passmark (which is what dave was using to compare the two) tests multithreaded performance not only single threaded performance and they both bench on pass mark at about equal performance with the i7 5960x coming out about 100points above so sadly you lose on both fronts there :P (the passmark score is for the use of dual cpus btw so yes its using all 12cores/24threads), its progress, the i7 5960x is 1 year newer in terms of release date but more than 2 years newer in terms of technology so getting the same performance with 33% less cores/threads is normal)
Suggestion for next Test/Teardown: "easyjumper(TM)" from Amazon.
Recently discovered this on photonicinduction´s Channel and would like to see a detailed test. Especially concerning the safety of this gadget.
Thats not a knife mate... this is a knife.
When It wont play it I mean at 50 frames per second most laptops, Ipads refresh at 25 frames per second so the extra overhead in bandwidth and processing is completely wasted. Only very fast moving filming is worth 50 fps ie sports.
I know this is probably a noob question but... In pcb design, is there really a reason one should avoid 90 degree angles? I etch my own boards as a hobbyist and like the way square traces look. Am I missing something important? By the way, love your videos Dave!
As a circuit board heats up and cools down the board and metal expand and contract. A sharp inside corner corner is a spot a crack can and will easily start. For example the 1st jet liner crashed because it had square windows, crack started in sheet metal window corner causing fusakge skin to split open. So now all corners, especially inside corners are rounded smooth transitions. That's why you drill a round hole at the end of a crack in metal to stop it from cracking firthure.
"dufresne hope I'm saying that right'
...didn't you ever see Shawshank Redemption?!
Not sure but if someone wrote software for a Nvidia gpu you might be able to get fast video processing
you didn't move anything on that board(ecu)
Watch the Shawshank Redemption, Dave. The main character's name is Andy Dufresne. It'll teach you how to pronounce it, and it's a good movie too.
I'm sure this ECU operates fine, however I must say the case it's housed in doesn't inspire words such as quality build. For the climate the sender described, I am guessing this must fit inside another water/air tight casing??? Surely.
Why would you be using recording 60fps video when the content you make dosent require a high frame rate
why is square routing so bad? i usually do square routing (hobby electronics) because it seems easier to me.
Yeyyy mail bang !
My old 90 integr'a's ecu is conformal coated.
So if the land of Oz blows up in the near future, we'll know why... :P
And that little lego-compatible robot is pretty neat...
Great shirt Dave!
I pierced my finger while removing an 8 pin op amp from a socket..... fingers yield a lot of blood.
MichaelKingsfordGray Yeah, it wasn't much, but I was shocked at the amount of blood that came out.
mmhm Atomic bombs and Electronics, now we are talking. Good stuff.
it will be great for sagan as you can put lego on it.
Well I'm currently working VHDL with a FPGA development board borrowed by the university because I can't afford one while you're getting it for free :(
32:50 An inhabitant of Hong Kong is called a Hongkonger.
For rendering more cores is faster and not the over all speed...
at 29.00 an electronic rotary converter