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Seeing the ten year old with a lab has restored a bit of faith in humanity.

Great to see you giving your time to such a nice lad. Ignore any negative comments, such people really are incomprehensible to me. Well done Dave.

I'm pretty sure that esp8166 / esp8266 is for wifi, not bluetooth.

I prefer the format where you open an item and then inspect/teardown right then. I suppose it's more work for you, but it's much easier to watch.

It was fun having Ryan on these mailbag videos, he's a good kid. He's already learned one of the biggest lessons for RU-vid and for life in general: Screw the haters! :) Good on you Ryan, and good luck in whatever you choose to do in the future. On an electronics note, that electro permanent magnet was like some kind of black magic... I had no idea you could create a permanent magnet with a brief pulse.

"Your a great teacher....very hands on...." DODGY LOL!! jokes :)

Hello from Toronto! I love your videos. Half the time I am not sure what you're talking about, but you're so funny I keep listening. I've learned a lot and am ready to dig into this hobby a bit. Thanks so much for igniting the spark in me and my two kids. J

I assume: Vienna Choir Boys: as in Vienna Austria, as in Australia, not Austria. :)

Love the new single take format please do all future episodes like this!

But that Ryan and a professional YT career? Can't imagine that, sorry.

Dave - I respect you for bringing the kid onboard. You're a good mentor.

EEVblog Dave I don't mind the format of this mailbag at all, but if I were to pick I'd pick the previous version. It just seems to flow better.

Hello, Andreas here from NicaDrone You should be magnetizing while in contact with the ferrous target :D the entire resistance of the capacitor and thyristors is ~70mOhm the current really should be around 300A. But accounting for the shunt resistor's inductance while doing the current measurement is a bit problematic

The ESP8266 is a *WIFI* microcontroller, not Bluetooth. It's actually quite a capable uc and I wish people would stop using the crappy little ESP-01 module. It has a 32-bit RISC processor running at 80MHz and 16 GPIOs, which can also do I2C and SPI. And WiFi, all for very cheap. Get a proper board that provides access to all/most of these pins and get programming with NodeLua or the Arduino port (github.com/esp8266/Arduino).

Wish my work experience was so inspiring great show as always keep up the great work :)

the esp8266 is wifi, not Bluetooth.

It's not a Mailbag video when there's a second guy with you doing the things... Sorry...

Noooo that kids back :(

I liked this method of opening everything first and then taking a closer look to each item

Really liked this format. Ryan take care and hope to see some your projects in the future.

That electromagnet thing looks interesting. If he is actually getting a 300A pulse, it must be by charging the caps to a high voltage first, so that when he shorts it with the thyristors, there is enough voltage to overcome the drop across the ESR. But are those caps rated for that much surge current? I doubt it. So I wonder how many cycles the caps will last. Especially since the two caps probably don't share the current very well, and the one with the lowest ESR gets the biggest peak current.

You need to get Ryan back for guest appearances... He's naturally relaxed in front of the camera and his naivety in the electronics world paired with your expertise is a really good format. Loving the dual presenter format.

The "bluetooth" adapter board is actually an esp8266 wifi board attached to the usb to serial. You're right that the wifi board only costs $2-$3. The brief view of the letter mentioned it. Some very cool things going on with the esp8266.

The 'Fail' button is cute, but I can imagine it would be a bit nerve-racking after awhile. Don't let Sagan find it! ;) My son was surprised that you didn't say anything about the cordless ESD strap, because you are the person he learned how useless they are from, in the first place. lol

I like the pace, I like the work experience Ryan helping out. All in all more enjoyable. it's good to see people learn and have an opinion, good or bad. Part of learning. When the Ryan also a grass @ 0:29 has gone,maybe Dave 2 could do the same on mailbag. It also keeps your arse in check, my 17 year old boy as they do forever corrects me. I will get my revenge when he has kids mur ha ha.

I prefer the "old" mailbag style, I think that its better when you open the package, read the letter and do the two minute teardown etc, then doing them all at the end

Really incredible how you do the mailbags. Never considered you went back to do the teardowns / closeups.

Ryan is hilarious. Cracks me up every time he is on the show/mailbag. Good luck in the future, Ryan!

I think Dave set the bar pretty high for over-the-top enthusiasm! Ryan was a great straight-man for the combo. Though, he needs a good haircut, I'm not his mum, but that hair!

Belle, West Virginia, just a few miles from me! Good to see some mail from our state in there!

Dave still hasn't noticed the upside down equipment courtesy of Dave 2 lol

That is the screen to a handheld night vision device. the other half is the actual camera and IR leds. I dont know if the camera was originally color as I got a couple of those in the same condition you got yours. You should be able to wire in power and feed a composite signal into the output and display an image though on mine I had to add in a resistor to the brightness wire to make it useable. (I dont know if it can do pal)

"Going in from the rear folks..." *fail sound plays* LOL

That's awesome that you're getting younger people involved! Perhaps next time you get a work experience kid you could do an instructional video going through the steps for designing and implementing a basic circuit?

The soldering on that magnet was terrible Im surprised it worked.

Dave, you crack me up. "There is a lot of Australians boycotting Bali right now.. let's not go into that"... haha, you just left us hanging. Laughing out loud! Love your videos man!

Your better send your assistant home to shower and wash his hair, he has a load of dandruff on that tee shirt.

The most awesome part is the mail from Tate (hope I am writing his name right). Amazing lab you got there!

"Mississauga" is pronounced Mis·sis·sau·ga XD From your fellow Canadian!

I can't stand this kid.

12:38 "That's got 'Win' written all over it." Nope, 'Fail' :p

In response to the comment around 44:00 mark, I would really prefer the USB connector currently in place (the B-type - A being the one you put in the computer), since it is the most robust (and bulky) in design - sure it's not as compact, but it should be more reliable. I do realize that in this case you won't probably be using the adapter daily and thus my opinion doesn't really affect the lifespan of the device and/or it's reliability. The microUSB connector is used on many phones nowadays (EU standard if I recall correctly) and I've never seen a phone go past the two year mark if it's used actively for charging the device. Though my phone is over that 2 year mark, but only because I use wireless charging instead of the USB-cable whenever I have the chance (which in my case is practically always) - but that is besides the point. So, there is a reason to use that bulky connector (or it was the only connector already in the shelves) - I would prefer any other connector over the microUSB (and the upcoming USB C-connector). Even if it meant hooking up a 25-pin Parallel cable to my phone every night.

Ryan your great, but your making a mistake not taking up electronics. Whatever floats your boat.

Thanks Ryan hope to see you on here again

If I ever mail you something, I'm totally saying it's from my 9yo son so it gets a good reception. :)

It's amazing where some of these packages come from.

Great to see Ryan get some screen time :)

Yes like the single take, and good work on the mini knife for mini Dave.

Hehe, your friend is great! I like his comments and interaction.

Dave, I like the sidekick format a lot. I'm a technical person, but not an electronics engineer. Please consider a sidekick from now on to act a sounding board and someone who can represent your more casual audience (yes, you have a casual audience) and ask questions you may consider "obvious".

Perhaps the random thing with video out is part of an infrared thermal camera? It doesn't make a huge difference, but I do like the format where you immediately go into a teardown instead of opening everything at once. Perhaps you could still do the teardowns at the end, but put the clips right after the package they came from?

I'd bet that the display you can't figure out at the end of the video might be some kind of self-contained video recording device that you stick on the back of a security camera, so you don't need the big recording box in the back of the store. From the IR up/down buttons on it, I'd say it supports control of an IR illumination ring for use with B/W cameras in low-light situations. Either it's that, or it's some kind of display used during setup and installation of a camera system.

I really like this format! Get trough'em fast! :p

for the copter newbies flying with GPS and compass support I wouldn't recommend a magnet in the vincinity of the magnetic sensor :)

Good go at helping out the young Ryan getting his feet wet. If you don't have 'Mentor' on your C.V. you need to added it, I think it is a big one. I enjoyed his addition to the blog and the chemistry between he and you, I don't know how to say it better, was a bit quirky, but in a good way and made me smile and laugh from time-to-time. Keep-plugging. Cheers, Mark

@ 3:00 those led lamps are pretty good in my opinion plenty bright just don't change it with the power on it uses the cheap capacitor for power control so could give quite a shock, it runs at about 48v.

Al-I-Co -> Aluminium Indium Cobalt. Indium lowers the coercivity of the magnet to let it be demagnetized without having to bring it up past the Curie temp. Basically AlNiCo's 'rechargable' sibbling alloy.

LOL You'd be the ultimate bloke to do work experience with! I couldn't complain about mine but not very hands on, they don't tend to like anyone wandering around refineries, let alone a work experience student!

tbh I like it more when you cut to the detailed shots right after opening the package. But couldn't you still record all the opening in one take and then just edit in the detailed shots later? But I assume that's what you've been doing before, changing the camera position back and forth would be even less efficient than the editing...

He's like Crocodile Dundee with the huge knife. Now that's a knife lol

You scoff at the crappy LED lamp, but consider where it's from. The guy who sent it to you probably made it himself XD

Everybody! Send more crappy led lamps. Only one per package please

Watched your anti static video today as part of a training class at JPL haha

personally i liked the previous method of mailbag, i feel like i have more interest in the items that you open when you first open them

I like the previous format better.

2:49 your student moves back to avoid being struck by the jungle knife!

can't wait to hear the Fail Button during your next Chinese "Wan Hung-Lo" Electronics Teardown!

Nic A Rog Wa has four syllables. Love you Dave :)

Great format. Hope you invite him back.

"That's got WIN written all over it". No, it hasn't, quite the opposite in fact. :P

I believe there is a new 100w amp FAIL box called the 'BIG FAIL' :-) BTW there are many ESP8266 variant boards now. Some have extra I/O pins and external antenna connectors for over 300 metre ranges. Also various firmware versions for these chips which include web server and 'Lua' code uploads. Good luck cutting the GPI0 track for firmware flashing though. Not that I've tried flashing one of my ESP-04 modules yet, but have cut the track with a pin and 6x mag and it was a real pain!

I guess at this point you can expect postcards being wrapped in huge packets ...

Thumbs up for the work experience kid! :D

I wonder if they sent you those Chinese Wireless Static Grounding straps because in China, I personally had to correct two fabs who the managers thought those straps were completely "wireless", so they didn't connect them to anything. And all of the local solder shops sold them that way. It took me quite a bit of explaining to get them to believe me that they didn't magically absorb the static, they still need to be grounded. x100

I'm sure that LED light was meant to be a short teardown?

You said mississauga wrong. (Now I'd the time to press the fail button)

On the last device, which Dave assumed might be a CCTV monitor, couldn't "IR" stand for "Iris"? I have seen that abrivation used together with CCTV cameras now and then. Especially confusing if you have CCTV cameras that actually have an IR mode for night operation. The "video out" possibly could be a feed through from an input on the missing backside of the device, allowing you to display the live video on a bigger screen?

I have to say I don't like the splitting of mailbag into unpacking part and close-up part. I find it confusing, sorry.

In America it is a stylus not a tablet tapper

Those look like the kind of capacitive touch styluses for phones that pound shops sell in the UK - £1 for a pack with one of each type, usually.

isn't that LED lamp that can shock you if you plug it wrong?? i remember seeing something like that in some post...

That LCD looks like the ones you see on those low cost, general purpose endoscopes.

God-DAMN what an enjoyable week :P

My guess is the display/controls for a thermal imaging camera.

Please hire that kid for every mailbag. Hes pretty funny.

Ryan... that hair... damn son

I like the USB A connector more because it seems they have higher durability

That last item looks like the control screen for a hand-held microscope (the kind with the tube cameras)...

Victoria is just a bit south of Houston probably about 75 miles or so.

I would be worried about buggering the compass on the quad copter.

The best mailbag ever

Hi Dave, It's not USB A it's a USB B connector... just FYI ;)

Can't quite grasp how those wireless ground straps could possibly ground anything without a cable...

Looks just like a monitor control included with inspection cameras.

I do like the single take thing.

The poor scope is still upside down

You are great guys!

That last item looks like part of a digital night vision device.

4:34... come on Dave RTFN... ;) BTW... I like this Open All Packages first then do a Tear Down format a lot better.

I really don't like the close-ups and tear-downs being separate at the end of the video. Especially with a long video like this, I won't remember the relevant details to all the items mentioned before ...