EEVblog

[@Thesignalpath]

The painting gift is so extraordinarily sweet and kind. You should be proud of your impact Dave.

[@trustthewater]

I don't normally go for abstract art but I actually really like this one.

[@SodAlmighty]

It sucked though.

[@iMagic16]

it is never about the quality, the thought behind it is what counts - regardless I think it's pretty cool personally

[@Lennyp4]

@@SodAlmighty no i just look at it and see something so uniquely organic. i won’t go all connoisseur on you but i really like it

[@CrazyRoadblockisbae]

Thumbnail at 12:24 thank me later!

[@whytho2301]

CrazyRoadblock Thank you! Now I can sleep

[@theUBERKron]

cheers

[@gilgameshismist]

Top selling product at ebay at this moment.. "WWII Cold War IFF USAAF B-17 B-24 B-25 Radio Destroy/ Destruct Switch Box BC-765" The guy selling is having a blast! :P

[@michaelwilkes0]

thank you

[@abd360g5]

thanks dude now i know that doohickey

[@blubb7711]

WARNING: Apply to input (FEED) jack only! Applying to output jack will overload your device. 26:13

[@leisergeist]

Fucking gold!

[@ELECTROHAXZ]

Ikr so funny

[@Knight_Astolfo]

I had to double take when I saw that

[@PaftDunk]

Wow, I just now got that. Great one

[@blackjebus]

Anyone found a place to purchase

[@williamsquires3070]

Each ruler is a decryption key - all you need now are top secret documents to use them on! The holes reveal the plaintext.

[@EEVblog]

Of course!

[@ghost_ship_supreme]

William Squires this deserves top comment!

[@gravelydon7072]

If you look at the rulers, you'd notice the design in the background is the same as a bee's honeycomb. There is your bee tie in.

[@TheStiepen]

fyi: The City Köln is internationally known as Cologne

[@juststeve5542]

And Łódź in Poland is pronounced Woodgz... Just be thankful it wasn't Wroclaw ;-)

[@mikeselectricstuff]

first "dc/dc" module pointed at looked like just a common-mode filter

[@DonkeyLearningIT]

Haha, I was saying the same while eating and watching the video. Even stopped chewing for a moment. It is funny that I was not the only one who thought that.

[@thehoovie]

those LTM4600 units are nice, 10A continuous @ up to5v, i could use some of those.

[@isettech]

Way late, sorry, but SSR to control the heater current, since everyone missed it so far. 3A heater max.

[@ghost_ship_supreme]

I like rulers that don't have the 0 at the end, because when it inevitably gets damaged on the ends, you can still use it!

[@BLOCKsignallingUK]

Also if you are drawing a line a certain length with a ruler, you don't want to start your pen right at the end.

[@AMalas]

You can always start from 1 and add 1 more to the drawing/reading

[@jspeare95]

The alcatel lucent device at the start is a line card, It'll go in a router chassis. Each line card will have it's own processor and memory to be used by the device to perform packet forwarding for the interfaces on that line card.

[@TomStorey96]

This won't be for a router, it will be for one of their optical transport platforms - more like a switch, but even slightly below layer 2. Terminology like "shelf controller" combined with the T1/E1/J1 card are dead giveaways. Reminds me a lot of the cards you would find in a 1655 AMU, but they didn't use levers to eject the cards IIRC. But yes, very common for large platforms to have distributed processing and forwarding.

[@UTubeRangerBob]

Ref 12:24, when I was in the USAF in the early '80s, we had special processing equipment in what we called 'the vertical drawers' in a 19" rack. If our detachment was overrun by anyone, the on-duty equipment operator was to set off the built-in mini shape charge that would blow a hole through the set of circuit cards in the vertical drawers. The cards were wire-wrapped so there wouldn't be any circuit board bits that might be possible to reassemble by the bad guys. P.S. Apex is still selling those 'DANGER' switches on their eBay store. $40, +$5 shipping.

[@killernoob756]

The red explosive devised can be found in the WW2 B24 liberators. They are used to destroy the very early auto pilot

[@twocvbloke]

Them bike lights have a clue as to where to fit them, they're called "TireFlies"............ :P (Hint: They attach to the valve stem on the wheels!!)

[@AAAyyyGGG]

Guess someone never rode a bike in his life!!

[@John_Ridley]

I wonder whether Australia uses Schrader valves on bicycles. I think they may be US only. Road bikes in the US and I think pretty much all bikes in the EU use Presta.

[@harbselectronicslab3551]

Those flashers screw onto the valves.....centrifugal force turns them on....

[@EEVblog]

Ah, of course!

[@jaas9457]

Harb's Elecronics Lab I was coming to write this. beat me to it

[@harbselectronicslab3551]

My knowledge comes from the University of Fatherhood.

[@cameronwebster6866]

I had a set of those when i was younger, they screw apart to change the batteries.

[@OverKillPlusOne]

they probably also unscrew to replace batteries, couldn't quite tell but looks threaded up top past the valve stem thread on.

[@bentfork]

The two flashing lights at 21:29 look like they go on the bike tire fill valves. Probably activate when the spring of the switch is forced out from centripetal force.

[@cameronwebster6866]

Bingo, I used to have some of those, till i took them apart.

[@andrewnz8753]

Cameron Webster ?

[@boldford]

They don't need to be banged.

[@truebluethecat]

That is exactly right. Put them on the tire valve stems

[@motaboy2002]

At 30:00 has the earth pin of the IEC socket been cut off? Considering the device is enclosed in metal I would hope its earthed!

[@3fus]

I don't think it's been cut off. If you see a few seconds later you see the PCB layout where the mains connector will be soldered in. The incoming mains have the pins bend at 90 degrees downto the PCB. The center pin goes to another hole which can take a screw or wire to connect to the case for earth contact.

[@theSuitMusic]

Hey Dave, I work as an ASIC designer at Nokia (formerly Alcatel-Lucent), and that board (or at least its form factor) looks quite familiar to me. I'll ask around to see what it's purpose was. Seems to be the processor platform for either a core/edge IP router or for a fixed access (DSL/PON) street cabinet. Wouldn't be surprised if those 2 other heat sinks had some Xilinx FPGA's underneath them. I'm sure our board teams will be honoured to be featured on this channel. As you said, these systems take a huge amount of effort to design, but no one really gets to see their (beautiful) guts :)

[@Steve211Ucdhihifvshi]

i reckon they should start making transparent street cases with led lighting ;) would look awesome

[@mycosys]

From the quad ISDN card, fast ethernet card and GE ports, im guessing it was used as some kind of commercial ISDN router?

[@GraemeWoller]

Hi bro! I've had a go at reflow in a frying pan and it seemed to go fairly well. I took my time to get the soak time etc about right and it reflowed nicely. No board cooking at all.

[@many-maker4420]

Hi Dave, Thanks a lot for showing off my ReflowR. I hope you try the test PCB soon, I am sure you will be impressed (even with the scraper/squeegee). The key to getting the “thermals” right is the proper ramp and soaking times, this ensures the entire board heats evenly and thoroughly. Looking forward to you trying it out. p.s. You can also now find it on tindie.

[@JohnMeacham]

Many-Maker it looks neat but I wish it had a front panel UI. at least a basic one to choose between profiles. it would be extremely annoying to have to use another computer when I just want to dial up the right profile and press go. especially when I dig it out in a few years and have to refigure out how to control it each time.

[@many-maker4420]

John Meacham, the front panel UI (not GUI) is really simple, one button and a beeper, just press the button 3 times to start the lowest temperature profile, (5 times for lead-free) and it will reflow your board. Press the button once to cancel, or twice to hold the current temperature. The app is useful fro more advanced features, like programming your own profiles, viewing logging info etc. For such more advanced features having a nice big screen phone or even PC is better than a tiny LCD panel.

[@many-maker4420]

simontay1984, They are $129 on Tindie : www.tindie.com/products/LafrasH/modern-electronics-reflowr/

[@theAGanimators]

A hot plate is only good for preheating? The Browne LR-6 was doing conduction reflow soldering of hybrid circuits at big name companies over 35 years ago. Kudos to Lafras if he can get this small unit and an Android phone to even closely mimic what a Sikama Falcon 5 or Browne LR-6 can do.

[@BLOCKsignallingUK]

I make a few thousand boards a year using a similar unit (UYE 946E). Heat to around 250C, then place the boards on. Takes about a minute or so for the solder to melt. Only problem I have had is with electrolytic capacitors which take a long time to heat, solved with a copper pad on the back of the board and vias to conduct the heat through to the top pad. Remove boards carefully with tweezers and a filling knife. Also, components near the edge of the boards take longer to heat, so keep large components away from the edge. You may need to temporarily hold the board down as the heat can make them warp slightly when first applied to the plate.

[@towerclimber7277]

That meter had to be a troll, you just can't escape it... But it's awesome that you showed it

[@cemx86]

At 41:22 - About the light green bodge board. This appears to be taking the place of a fourth language ROM slot. I think this because the keyboard has L1, L2, L3 and L4 (four languages?) but there are only three language ROM connectors seen.

[@VoidHalo]

Loved the video, Dave. And I ABSOLUTELY LOVE this channel. I'm not an electrical engineer, nor do I have anything but a rudimentary understanding of the subject, but your channel has helped me to become very interested in it and to learn more about a subject I might not have otherwise given any thought to. I hope soon to buy a kit of some sort and start getting some hands on experience and take my interest a bit further. Just wanted to say thanks for taking the time to make these and sharing your love of science and electrical engineering with all of us. Wishing you all the best.

[@nexaentertainment2764]

I actually really like the painting. I know a lot of people online are super harsh on art that isn't some renaissance grade piece of art. But I myself really like abstract art. I love the texture on it was well :D I also like Dave's voice :D It grows on you, it's quite comforting.

[@OneBiOzZ]

My mom watches your videos because she fell in love with your voice ... i mean it creeps me out but i suppose its flattering xD

[@EEVblog]

Consider me creeped out too.

[@markc2643]

As an old Air Force Radio Repairman, that 50 Ohm dummy load made me laugh.

[@toddberg3892]

29:00 Nice asbestos block - scratch n sniff!

[@Killerspieler0815]

@Todd Berg - Asbestos is still legal in many countries , incl. China

[@68pishta68]

its a refractory brick, not asbestos...at least I hope.

[@gordonmcmillan883]

I've got one of those self-destruct boxes too - new off that auction site. It is a WW2 US unit to allow air crews to destroy radios, bomb sites, and the like before leaving an aircraft over opposition territory. Mine is just wired as two push buttons in series. Saw it - couldn't not have it.

[@Soren_Marodoren]

That 50ohm dummy load is just perfect. Where can I get one?

[@Networkengie]

Dave, the card you were questioning about at around 1:20 is a DSU/CSU T1/E1/J1 quad port Wan expansion card made for what appears to be an IP edge router.

[@evefavretto]

Interesting is that specific Core 2 Duo is a mobile SKU, it's a T7400 intended usually for laptops and similar stuff.

[@marvin19966]

Everton Favretto cool

[@cburgess5294]

The hotplate reflow method is actually the preferred method for some of the smaller maker shops because it works so well and is very economical. I think either Adafruit or Sparkfun use it exclusively for their limited-run in-house boards, having paid several thousand $ for a professional reflow oven and being disappointed with the results. I remember reading and a good tutorial on the process on one of their sites. I use a ceramic griddle to reflow the boards I sell on Tindie and am very happy with the results. I might actually pick a reflowR up as it would be nice to have the thermal profiles available.

[@1framistan]

I worked in an AT&T central office for ten years, but I'm retired now. I don't know about that exact cards, but we had to plug cards similar to that into the racks. Some of the cards we handled were worth many thousands of dollars each!

[@NumbersSans]

Haha. I was checking the links in the description section.The link to the ABC book was kind of funny. I got links to books about ABS. That was the only typo. The Bee Math ruler caught my attention since I was a mathematics major. Especially the third ruler about integration and differentiation

[@kewakl8891]

I've grown quite comfortable watching a lot of channels at 1.25x, but I HAD to go back to 1.00 for eevblog.

[@dtiydr]

13:34 Hmm, it look like the filament is intact on that? Although worryingly black pattern on the glass but the filament seem to be ok and such a working B/A tube.

[@RickySpanish0]

I just love how you start your mail videos holding a huge knife😂 love your channel, keep up the good work!!

[@frostfirei]

Those flashers, go on the tubes, on the fill valves. I also, wnet back and watched all of the video, in the archive! Enjoyable days!!!

[@EvanEdstrom]

Does the server do POE for VOIP? The power brick at 3:48 looks suspiciously like a POE supply that we use where I work.

[@marcdufour2726]

Regarding the Craigs / AMIS translator at the end, I actually had a job programming these, back in 1985! They were available as a hand-held computers (HHC), without the translation software, and you could load them with your own custom software. The platform was a 6502 clone, and development was made on Apple ][ computers. You had something like 2 or 4K of nonvolatile RAM, and the ROM chips were 4K. You had to use very clever tricks to shoehorn programs and data into it (I managed to squeeze a 10,000 number table into a 4k chip, WITH the program to expand it - and this was before LZW became widespread…). The HHC we worked on were used in the life insurance industry, where agents printed out (there was a thermal printer available for those HHCs) tables of benefits for the clients they visited. The machines were programmed in Forth, which actually produces code that is even more compact than assembler. Our job was to reverse-engineer a competitor’s product (the insurance company was pissed that they asked a fortune to update the insurance rate tables), so for this, we wrote a Forth decompiler that decoded the ROMS and spewed forth compilable code. We had lots of shits and giggle looking at the "source" code as it was very inconsistent, like if written by a committee of monkeys, which made out job of rewriting the custom software a lot easier, as we could hand-code programs that were a lot smaller. Oh, that inductor you wonder about is simply to produce the high-voltage for the fluorescent display.

[@addman]

oh, it's a pacifier, I was not aware that dummy is the Australian and British English word for a pacifier. I felt a bit lost for a moment there.

[@EEVblog]

Oh, yeah, sorry

[@addman]

lol no big deal my friend, I learn a new term which is always appreciated and so is your videos as always thanks. (except for spiders why the hell do you guys call "rootbeer floats" "spiders")

[@kadmow]

@@addman : Cause we don't drink root beer....

[@muh1h1]

Wow, dave didn't see the thread to stick them on the valves, and not even the bigger thread to take them apart...

[@VoidHalo]

According to the patent (US6467939) for those bike flashers, you're supposed to screw them onto the valve stem on your tires and the rotational motion of the wheels should make them light up. That is a pretty neat concept, but makes me wonder how they implented the blinkenlight circuit in such a small device. As far as I can tell from the diagrams, most of the device is just occupied by a spring and small weight which acts as the switch when it spins. All the patent says is it uses an IC on a PCB, yet it goes into great detail about how the springy contacts turn it on. I'm guessing some sort of astable oscillator combined with a single shot to limit how long it's turned on for, but I dunno how they'd fit caps sufficiently large to produce an RC time constant long enough to keep it on that long or give it that low of a blinking frequency. Guess I need to read up on tiny blinkenlights solutions now cuz this has piqued my curiosity.

[@CassetteMaster]

Interesting the ROM configuration on that translator. I have found amongst my spare parts an EEPROM that was in a similar holder, but it was not for any translators.

[@Ken-oe3ch]

The note and painting from Ingrid is awesome. Looks like you have the touch my friend.

[@jameskrivitsky9715]

Hi Dave, those lime green Fireflys can be screwed onto bicycle valve stems. As the wheels rotate, the movement activates the flashers. Enjoy your vids. Here in Houston Texas... Jim K

[@Bergerons_Review]

22:00 You put them on the valve caps or as valve caps on the wheels. The spinning keeps them on so you get nice big circle of lights.

[@network_king]

The green light things are valve stem covers for a bike, light up so help people see you or just for fun.

[@heathwellsNZ]

We haven't seen Sagan for ages... would be lovely to see him again!

[@draggonhedd]

Dave, the Tireflys work on centrifugal force. They have a weighted spring in them thtat contacts a plate when it moves, either from shock or centrifugal force. arnd as Grayfox below said, these are valve caps for tires.

[@IIGrayfoxII]

And they would screw into the valve stem of the tires.

[@benoitdebrueker2500]

The inverter in the Italian translator is most certainly to supply the AC voltage for the VFD filaments.

[@lordhibbert]

I do love your mailbag segments especially when you receive retro gear... I'd love to see more dedicated retro teardown videos.. HINT 😂 Cheers, Carl .... A newbie electronics enthusiast who grew up in the 80s 😬

[@Spender604]

That package from Ingrid was so sweet!

[@andystein106]

What is the technical term for the DANGER radio pushutton? I'm interested in getting one as a joke for my desk to put by my CB Radio

[@OAleathaO]

I want what this guy is on...he has so much energy and enthusiasm. ;)

[@campusto]

Dave, I must say; I do love you and your videos. You are a wonderful person with a life changing amount of information to give. Thank you. And about that voice of yours. It was the thing that made me stop my KZbin surfing and watch your channel more and of course subscribe to it. I don't what is the allure of it; but you do have it. :D Thank You again!

[@EEVblog]

Thanks.

[@HiSmartAlarms]

That blade server is most likely a trunk card for a main frame ip phone system. Such as 3 com makes a phone system server that has a blade server like that but its for trunking

[@rikvdmark]

"I'm cutting towards myself because it triggers people". You're laugh certainly triggered my laugh Dave 😂

[@whatthefunction9140]

Your voice is the best Dave! Even better in 2x speed.

[@BoB4jjjjs]

I love those IC insertion holders at the end, Wouldn't it be brilliant to have those in production for home projects or even for a better ic holder, production costs would kill it before it got off the ground. Fantastic idea though.

[@darkfoxfurre]

For painting- Follow along some Bob Ross videos. He tells you which paints you'll need and it's easy to get the materials. Landscape painting is really easy to do.

[@compactc9]

Cutting towards yourself only really presents a danger when you have to put enough force on the knife, that if it were to slip, would cause you to stab yourself. Dragging a large, sharp (I hope!) knife through clear packing tape is really not very dangerous, unless you fall on it or something...

[@muhammadshahzaib3813]

"you don't need a qualifications to do electronics at all." I loved it. I am also a zoology student and dev regularly.i love this channel ❤️❤️.keep it up.

[@douro20]

There is a 555 Relaxing Station and a 777 Relaxing Station, both in Clovis, CA. They are massage parlors. "Under construction since 1868" apparently is a very old joke; don't ask me what it comes from.

[@AirzonesBlasters]

The first PABX expansion card at 1:23 is quad E1/T1/J1.. Primary rate ISDN. That's where the twisted pairs from Telstra / Optus go in. They are digital though, typically holding up to 30 channels per E1 service. The handsets you'd attach to this would all probably be VoIP though.

[@experiencingtechnicaldiffi5184]

Something I have always wondered about... how do you test a self-destruct button?

[@johnfrancisdoe1563]

Experiencing Technical Difficulties Same way you test a bomb (These were designed to destroy the top secret bomb drop aiming device that the allied had on their bomber planes, the very fact that they aimed the bomb by flying the bomber plane automatically for the last few moments before the drop was such a big secret they even called the device by misleading names, such as "special radio").

[@AndyMarsh]

Haha... like the cheat sheet rulers... My Casio FX82A stil has Xc=1/2pi Fc written inside the battery cover in case I couldn't remember it in the exam 30 years ago...

[@hjohn61251]

The box shown in the thumbnail pic is a IFF radio destruct push button module used on WWII Boeing B-17 bomber. it was mounted on the cockpit instrument panel so either the pilot or copilot could get to it in the event of a crash landing in enemy territory to destroy the radio gear.

[@Bodragon]

Dave, those little blinking thingies replace the dust caps on the bike wheels.

[@SantaClaw]

Your voice, it grows on people.. at first it was a bit annoying, now it's beautiful, soothing +++ It's like growing into a new taste in music :) Keep it up !

[@johnfrancisdoe1563]

Adafeuit or it's founder has detailed instructions for doing reflow soldering using a kitchen (electrical) skillet. This kickstarted box is basically the same technique in a cruder form factor but with automation.

[@jojos08]

Error in the description: please correct the link for the Arduino interfacing ΑBC book. Keep up the nice videos!

[@DownhillAllTheWay]

I inquired at my local stationery shop, but they didn't have a letter opener like yours.

[@acceler9]

I have that exact alarm clock! The sound quality sucks, and the rotary switch is dodgy.... But I LOVE the start-low and ramp up alarm, and the per-day alarm schedule!

[@neilolif]

That IMS thing is a Push to Talk over Cellular telecommunications server. It is a HOT Pluggable blade! Cool stuff.., Very expensive, no doubt!!!

[@vgamesx1]

That basic connections book is very nice, although I still prefer something like a phone app, such as ElectroDroid which gives you categorized lists of components and I think some let you search for what you're looking for, much easier/faster trying to find something.

[@dmcemmet]

Judging by E1/T1 ports this Alcatel Lucent thing is a cellular RBS site router. And yeah, it basically puts oldschool GSM E1/T1 traffic through GE. Propably it can also support 3G and LTE traffic.

[@dentakuweb]

Would the first item from Melbourne be from recent Amphour guest Jon Oxer? The little green glowing things have internal threads that let you screw them over the bike's valve stems.

[@Brodaty_Brodacz]

Hey Hey EEV :) am Polish living in UK and still i got the nose to sniff some good Electronic Videos :) Keep on doing it mate You just one of the Kind :)

[@FXP1688]

I love the Reflow Heater. I do this with a crepes hot plate from the supermarket. Works fine for me and I think this heater should do it's job too.

[@KrzysztofDziuba----1-2-3]

You could use your flir camera to check heating area of this "reflow oven".

[@westleypelton9411]

You seem to be the only one who got their ABC: Basic Connections book from Alberto.

[@lo377ps]

+EEVblog Why do they use 100 V Caps on a server Board?

[@fstemarie]

That knife is so Australian...

[@Killerspieler0815]

@EEVblog - They combined various off the shelf stuff @21:20 in this alam clock, thats the most probable exlaination for this mix

[@mikeissweet]

Greetings from Cleveland, Ohio!

[@Pilotmaverick]

Where is the red "special radio" from the thumbnail? Was interested to see this in the video, could not find it.

[@scorchedearth1451]

Googling any names or numbers on it is always a good start.

[@dawn1berlitz]

the bottom part of them bike lights where it screws onto the valve stem does come off to replace the batteries i used to have some i wish i could get some again

[@michelkeijzers]

Although I don't recognize the Alcatel/Lucent board exactly, I have worked for a project for them at 1997-1999 and that kind of boards look familiar. If it is a board from that project (or similar) it was (is) used for (fixed) phone telecom centers/operating centrales (not sure if the translation is correct), thus as expected not for end consumers. Lucent delivered many to Japan. Most devices like these served as multiplexers and other processing for telephone lines. I don't know how many have been made, but similar boards like these, I have seen (and worked with) in Neuremburg, Germany. There was a room with thousands of these boards connected together in 'walls' like 5 meters, 3-5 rows high full of such devices. In the development room in Netherlands we had hundreds of these kind of boards. Btw, I'm a software engineer, so forgive my lack of knowledge or not checking details about the boards I worked with.

[@Treveliian]

those lights screw onto the air fill valve on the tire inner tube. they flash as the tires rotate. just replace the plastic caps with those and give it a ride.

[@SanosukeTanaka]

I'm way behind on your channel. Need to go back and watch episodes I missed. congrats on passing 1000 episodes.

[@electronicsNmore]

29:03 looks like the refractory lining in my 2000 deg F dental burnout furnace.

[@JohnnyYenn]

Thank you for reminding me about that Cleveland video 😂😂

[@deuspax]

not sure if it's about temporary situation, particulary this video is not working update after 6 hours - still not working update - is working on any resolution but 720p

[@david0fc]

Are you holding the paint upside down?

[@INDEED9104]

Honestly Fresno has the best interstate exit system I've seen. Though I've only stayed for a couple days and didn't see much traffic.

[@fredflintstone2621]

So Dave show us how you would salvage those big SMD caps.

[@calebgregory1405]

Does anyone know what the ROM sockets on the Craig translator are called? Ive seen them in some older equipment, Ive been looking for a source.

[@John_Ridley]

Don't feel bad about being late with the kickstarter, many of us save mailbags for months or years until we're sitting around with nothing to do. Here I am watching this for the first time 3 years later.

[@douro20]

This is the 60th year NuK's been in business, and there is a website where you can order custom soothers. He probably got that one direct since NuK is based in Germany. The fibrous insulation in the ReflowR (Product of South Africa) is Roxul.

[@krypticmac]

you say no one likes your voice but i do i could listen to you all day

[@EEVblog]

I'd recommend seeing a psychologist :->

[@WereCatf]

I backed the ABC-book by Pighixxx on Kickstarter, and I think it looks just fabulous! I'll definitely have use for it and I don't think the money I paid for it was wasted, even a little bit.