Hi welcome to Mailbag Monday Where every Monday I open up a bunch of packages sent in by my viewers to my PO Box You never know what you're gonna find. so let's get to it. And there's only one way to open packages here in. Australia Let's go I Don't want my viewers in the Netherlands have you get a package from the nether regions? um no name on it? So let's go please.

we don't read notes first. closer surprise. oh I think we have old and croc? What on earth is that? Beulah Beulah hi Dave it's a Geiger counter from the army'd a broken reassembly failed to possibly defective as doesn't even respond to a thousand false thank you very much marks from homeland. Jeez I See it called Holland much anymore do you? It's two minute area letter typed with over-the-top typewriter simulator.

oh that's pathetic. Simulate it I know I refuse to google it. Know what a real typewriter? Anyway, two minutes here down here it is. Look at the thing like what? what? what? 250 euros Freeman is the battery compartment? Oh wow.

so yeah, that's just built like a brick. done hidden it and the screws are conveniently off. So worried hello, we're in like Flynn straight away. Check it out.

Wow What's going on there? look I've got a bulb as a bulb that obviously like is designed to light this up. Not sure. is it? you know, is it like that's supposed to like supposed to move around or something? I'm not. Yep, there we go.

sorry Oh Check it out. These are the different Rangers are sweet as oh. look look the different bar. Check this out how they get the different Rangers This is great.

Look at these impulses per minute. Yep, Beta plus say Gamma is it and how they'd get their different ranges as look. Watch up here. Look at the slot the the apertures just closes.

That's basically I Don't know what that means huh? But Oz I don't I don't get it. but they is that like off and then ranges and like it opens, the aperture physically opens a shielded aperture up there. Wow That's beautiful and that's very gemin. isn't it? Very sort of like you know, World War Ii German.

but this is. this is fascinating there. this what on earth? What? What is that we've got? It's some sort of vacuum. is like almost like a neon lamp got.

Is that a resistor? A massive resistor up there with in caps? What? or is that I don't know. There's a Roy brand caps a roid. It sounds like a hemorrhoid cream or something. That's great.

Anyway, got some trimmer parts here there are sealed for our protection. thank you very much. And the switches over here. The way four switches if I turn if I turn that obviously it.

It also chooses some different. They're electrically coupled down here. So and it's like tag board resist or is that it what? Wow look what's going on Bat old? What? Oh there we go. So that turns there.

that's the battery. Wow. So it switches it on and then turns that What? That's some coil. Okay, yep, that's that's a little transformer is it? So we might have a DC to DC converter there by the looks of it.

So to generate up, generate the voltage, wires come off. but I'm gonna have to get medieval on its ass. Really, it's a bit. Wow construction like this, just jam-packed together.

Sorry. I'm gonna have to I think I'm gonna have to physically destroy some stuff. Well there we go. Fantastic.

It like it's a like an hourish shielding thing. I'm not sure why it's better. it's just. no.

it looks like it like it's just a padded thing, but they've done it as like a little mesh. RF shielded things. Sorry for those who think that this is shouldn't be torn apart like this. but not sure what I can do to get in now.

I've got a desoldering think you'd have to. Yeah, yeah. I got a disorder. everything to get in there.

anyway. it's not a huge amount on the bottom. There's another little transformer or choke or something going on, but whoa. Absolutely fascinating.

anyway. I'll have to include the schematic which is here. Terrific. so have to match that up.

That'll be an old-school schematic. I'm sure that's fascinating I Just love the physical aperture. Wow Oh, it's not. Yeah.

I Know there it goes. Oh, it's all out of whack now. Well here we go. Here's our tube.

Oh there it is. Beautiful. Look at that sweet as defunct obviously. but throw you a Geiger counter to fanboys there it is an F H - 7 6 V - yeah - 7 6 V Know it well.

Can you still get replacements? No idea. but yeah like it comes through that I'm sure it's like super sensitive and it comes through. They controlled a picture that's great. Thank you very much Mark.

That's terrific I Just love like things that are more physical than electrical really. Although this a lot of electrical stuff in there, but it's still. that's it. Like that's built like it looks like a tank.

It's like it. Seriously, you could run over the thing with a tank. Brilliant. Oh there we go.

Yeah. external hum speaker jack there. If you want to actually hear that, you know the typical classic Geiger counter sound. Thank you very much Leo in Bodnar Electronics I Assume it's Leo Botany himself, but from the old dark the UK and from Silverstone North ins.

Never heard of North ins. Anyway, somewhere in the old dawn. surprisingly little in here, so let's just rip it open. This doesn't have one of those pull tabs so cheese and again, there's not much in there either.

So it's like, well, there's Russian dolls, you know. Oh we do have a note though. lucky I didn't slice and dice the note. We have a tiny little thing we're gonna read the note yet.

Thank you from Leo Bodnar look Absolutely tiny Service quiz that looks like something that some sort of pulse Gen that you're plugging in your scope. Cool. Let's check it out in case your eyes rolled inside. This is not another Jim Williams Avalanche designed yet.

We've seen several of the Jim Williams designs before. They're very common. Everyone makes them and they're in the order of a couple of hundred puffs. Rise Time: Yes, I use the word puffs even though it's picofarads instead of picoseconds.

but you know, oh, habits. Anyway, this one's 40 / 40 pika seconds for 10 to 90 percent rise time. Check it out: One volt amplitude, 50 Euros in 50 pounds sorry in cost. none that funny-money euro stuff.

Um, Leo's site is down below PS useless fact of the day posters with 6 volt output in 50 ohms and 500 puffs. rise time is still considered to be strategic military and Julius items that require export authorization. So oh yeah, there's you know, 5 volt rails that can trigger nukes any weight fixed 10 Meg right? And yes, we can measure the rise time of scopes in intense slightly above 10 gig. Well, I've only got a one gig scope here, so I don't think we're gonna be able to measure the 40 pika seconds rise time, but you can use the typical bandwidth that's for your analog and for your digital with your regular you know interpolation front-end Then we're talking about 0.45 on the rise time.

But anyway, let's plug it in and see what's what. And Leo uses a tech CSA 8:03 a sampling head for the test and development. And yes, look at this. We have plots there.

it is 33.8 picoseconds rise time. Beauty that's a Bobby does what. Let's plug it in even though we're not going to be able to measure it. its power from USB Very handy for modern scopes.

Let's go. It's the board for those playing along. and hi and look at the cutout there. that's a That's a beautiful layout.

I Like it. layouts quite critical when you're talking about. You know, in the order of a 30 pika seconds rise time, it really really matters. So that is that is sweet as check it out.

Got external trigger out as well. Beautiful! I Really like that. Good work Leo, that's a Bobby Dazzler And the thing we thought being C's is that you really start getting to the limit when you of what they're capable of being width wise. When you're talking about these, you know your 10 gig scopes and whatnot.

They can still use B and C's but that's really bleeding edge and they use your like their specially engineered to you know get the tolerances required. But anyway, let's just whack it in there see if it works. Power comes on. So I got my tech MDO 3000 scope here.

one gig analog bandwidth. that's the best I've got here, so you know it's not going to be good enough to see what we've got. But anyway, we'll give it a go. Why doesn't this stupid thing go back to the center position? when I push it goes over here.

What? The I got a hold offset? Not. this is weird. My delays off. it's all the way over here.

Delay on, wax it in the center as you'd expect and then push it every centers. but that's with delayed on what? what? Automated rise time measuring Useless as tits on a ball. he's unstable. histogram our bugger off anyway.

like it doesn't even show the markers for the 10 and 90% Anyway, we're at four hundred picoseconds per division, which is the absolute best we can go to with the scope because it only has one gig bandwidth. so unfortunately it's going to show in the order of like four hundred peak a second. so order of magnitude more than what we want. so just not much I can do as we saw, we got the results.

So there you go if you want one. Leo Bodnar Calm. It's like overkill for almost any scope you can get. But hey, a lot of people are into high bandwidth scopes and you can pick up like sampling.

Scopes are really cheap on eBay Well, you know, reasonably cheap on eBay a bit. Of course they're not real time scopes, they're slow sampling Scouts but check it out. Thanks Leo I Don't my viewers from Austria in particular Christian Run backer in grass in Austria Okay, no workers. Let's lead book lamp.

Is it the actual lead book lamp? Bioengineered brush? freak. Oh they look like just you know, like jelly baby type things. Um sorry. Gummy bears.

Gummy bears. uh, soft and squishy. I've had it in my pocket. It's nice and warm and squishy and oh geez, my eyes.

bloody cases that just doesn't open. Wow, what is this thing? little keychain do? then? I think it's a little keychain game I Can't show you from here. Let's go up close and there's a note on the back from Ned Yeah, thank you very much cheese I Presume is Christian's partner and she Simpson gummy bears for Sagan and Huxley mmm thank you Pockets right? Game Boy and Game Gear emulators never really into the yeah Game Boy but anyway, this one's 40 apparently and using this T and 32 micro and it resets when you press the start button. Oh so obviously we're not going to do a a repair here in the mailbag, but there you go.

Oh look at that Still for sale, isn't it? Cute little gameboy screen. Yeah. I'll plug it up to a power banking. she's not doing anything.

No visual indication of charging ice in. There's like a little lithium polymer battery in it anyway. it's crack it open, no screws. I Reckon we can get in there.

Oh sorry and somebody's only got this. There you go Wow Not much is it? Yep, little early lithium polymer battery. There we go. Sorry.

Just got tiny little last surface-mount tactile buttons. there little screen set like a little oled job part number for those playing along at home and what does that say? No idea on the top side if we get our battery out. Oh there we go an ESP Voom Oh what's the in the room? 32 Yeah. ESP 32 Fantastic module.

and that's all she wrote this little yep, got ourselves a little Wi-Fi antenna. but yeah, it's not much to it until we knee is P 32. It's all you need really. And a tiny little pissant speaker down there, a couple of regulators.

that's all she wrote. No worries, thank you very much. Unknown person in the Netherlands No idea what it is a manufactured for Cardiac Science Corporation Cardiac Science Automatic External defibrillator. Oh it's a simulator.

It's an it's a defibrillator simulator from Cardiac Science. Sweet to me to tear down. Wonder if it works? Wow Thank you very much Brute Brute Suede, There's a J in there somewhere. Hoof stop from the Netherlands I've got no chance of pronouncing either of those names I Say this from a throwaway heap as the device is still listed on their website for a whopping six hundred and thirty bucks.

I've seen those Yankee bucks. Maybe a teardown evaluation as to why these things cost as much as they do? I'll put in the link down below for this thing. I Can tell you right away why they cost as much as they do because they're a very specialized, better kit. They probably sell these in the hundreds, maybe in the low thousands.

Something like that to test defibrillators and like, yeah, this is serial number here we go I think if they're doing them in order six thousand, two hundred, and Eighty nine, right? So really, it's it's not the number you'll probably find very little in here. so it simulates the chest signals from the from your chest that simulates your heartbeat. So it's very low level stuff. but there's a lot of engineering that goes into actually getting this right and possibly be getting it certified as well.

This one's not for training and sales demos purposes, only not for equipment testing and verification. There you go. So it's just a demo unit. So yeah, if they you know for salesman of these devices I guess So it's like who else makes these? That's why you can charge pretty much anything you want for a specialized bit of kit.

It's not uncommon. There's nothing inherently wrong with it. it's just what the markets willing to pay for such a niche testing device. So here it is.

it can generate. You know all the various waveforms that won't pretend to I know what they are and stuff like that. But if you're into your automatic external relators then yeah, go for it. Anyway, it's got an on-off discharge.

doesn't say where it's made it made in the United States of America Anyway, you've got these three regular tabs on here that you can just plug your device straight up to let's know it's gonna come open. Come on, Hey there you go. We're in like Flynn and wah wah Now we're talking uh-huh I Forgot about the this connector here. obviously goes up to the pads because these are just the the sense pads of course and it just generates the signal.

There's obviously not much in there. there's a micro, there would be a you know, a three channel DAC or whatever to to generate the required signals and some Op amps. you know. nothing much doing there at all.

I suspect. but yeah, this is nice. Dale resistors are 25 Ohm jobs 25 Watts Ah, salvage those. thank you very much.

So this is obviously designed to you know, hook up to the pads I Don't know about the connector I Don't know, you know how you'd like interface and test that. but whatever it's designed to what there it is. it's designed to absorb the energy from the from the actual units so you know if you've got one of those are battery-powered ones or whatever I'm you know it would be like a single shot and you've got to like recharge and more. They can use them a couple of times or something like that, but yeah, Copyright 1996 She's a bit old but there we go.

We've got some just some Op amps - yeah, I'm probably just got a diff amp or something I can't read those numbers from here. Got an LM C66 2 there and just a TI job. nothing fancy look at ya. just got a bridge rectifier there so that's pretty how you doing measurement like it's not precision but but as we saw on the back here, this is not a is just for sales and demo and stuff like that.

It's not designed for verification so it doesn't need to be precise, it just needs to see that you know I get that there's a signal that it's actually you're generating some sort of high-energy pulse from your and output of your a defibrillator. So yeah, it's about all she wrote. but I Get those resistors out of there. This suite is.

well, it pays to take the stickers off because I Thought this would be a micro here and this would be a deck IDI dude I'd to generate the waveforms. but I was wrong. No, that's an 80 mega. Check it out or you're a pal fanboy and now you must be a microchip fanboy because they bought Atmel Anyway, we've got an 18 mega here.

nothing special, no dock, just some Op amps and stuff. so probably using the I Don't think they have a DAC those Ducks are. they're probably doing that PWM outputs or something. but whatever.

And we've got an Atmel ROM here. Big one MIG bit ROM So obviously they're doing all the waveform stuff just like storing it in there. and all the micro doing is dumping that out. So they've got all the cardiac waveforms actually stored in there.

Well, you know, nothing wrong. we're doing that. It's fine. It just off loads everything and it's probably required if you want a lot of data to get really high-resolution cardiac signals.

It's better than like trying to have an algorithm to do it. Store it in here. You know, if you just get the raw data, you can actually capture them. What you can do is actually capture real ones with the scope for example.

like yeah, and they might like they've probably got like 10 different signals because you can write. You've got all the different stuff on the top. so you know if you can capture real ones on a scope and then you can just dump them inside here. Or you can generate them mathematically or whatever and put them in there or this.

you know. So I'm sure this standards for like cardiac waveforms and stuff like that, but yeah, you can just work them all in the ROM of course, your usual. While micros don't really have enough space to you like store a lot of high-resolution waveforms like that unusual ish. you use some sort of compression.

Too much hassle? Who cares. Just whack it in and external wrong. Bob's your uncle? There you go. It works.

We're getting something out of it. You know you're whacking across LL and IRA and well, yep, something in a sync mode. NSR I Don't know. look I'm just around.

but really, we're not gonna see much on a Skype You really need like a proper I'm cardiac amplifier here so dare. Thank you too. We can tell VIN aroma from Norway I think it's ripped. Oops open profit, open with proper knife only.

Its proper knife. Real knife, fragile at all. Oh Philips Discman Oh yeah. I Saw, you know dis my trademark by Sony Up there we go.

Yeah, where's the belt clip working on my belt rocking out to the oils? Marcus Beauty Wow sorry this is a seriously of my old bag December 11th 2017 and Coquille actually name was a bit familiar scent in the geocoin wonder. Do I still have it because it hasn't been seen in the world? Yes. I still have it. It's still sitting in my bag actually.

sorry I'm getting around getting back in the G occasion and place the damn thing confirming contact Major Tom So yep, let's just its yeah. December 11th 2017 Sorry, that's terrible Muriel Tip it to them. This product is designed and produced by Philips the inventor of CD and DCC Thank you very much Jewel DAC Know that single-deck rubbish. 400 millions for those playing along at home.

So if I got I got all the screws out I don't know. Maybe maybe not. alright. think we got it now and sorry if you want to see this in 4k.

but I don't know. Ah, there we go there. Look at that slide our battery compartment. That's great if you get the corrosion, good luck getting a new one.

I Guess these days you can 3d print one probably. but yeah, someone was thinking good on your Philips the inventors something's caught out. Something stuck over here. Bugger it? Alright Springs falling out anyway.

oh we're in. Whoa. Whoa. Big white is that silkscreen on top? What the hell is it caught over here? What's that's? a bloody screw? Ah, you have to get the battery compartment.

You have to pull the battery out there. we go. now. we're Arbor and Leslie and all the screws are falling out.

well. Jesus Not much to it. Check out the cord flat packs here. No workers like you know this.

like standard Esso type stuff. look at the 1664 SRAM that'd be the buffer little LCD there and like a Philips chipset and like that's it. Bob's your uncle. It's all in the one chipset.

There's our laser module for those who love their little laser modules there that's obviously gonna slide along their lasers on top. There it is. and we've done extensive tear downs of the world's first Discman. By the way, the Sony are the world's first one.

I don't Anyway, lots of flat flexes inside here. We've got our there's our spindle. There's our spindle motor and just a look at just DC motor here to drive the little worm screw. there just drives.

This goes around how you're doing. and yeah, I can't manually cut what manually. There we go anyway. it does.

Step in and out. There's some big-ass resistors or are they little little chokes? you know, AG's There's not much in here is there that's just like this? Just the one chips that they really get in there. Price point down. This is fantastic.

This would be like the Golden Age of you know CD Discman. As Katiyal said, it's yeah. before the Mp3 some took over and all that. and on the bottom side, there's gonna be some bottom side load.

Well we. Well, that's just just got. Whoa. What are we got here Stuck on the back? What? What's it? That's just like such as some shielding thing that's weird.

that's that's very strong. Whoa. Whoa. Yep, there you go.

It's just a crosshatch in PCB. You know, none of this newfangled Wi-Fi antenna rubbish or anything like that. They just decided after I know it's built into the case, but you can change the case moldings afterwards. But they went well.

We need some shielding over. you know, something over that section there. I Mean because there's that doing like you know, the main clock or whatever. But yeah, there you go.

I've got a Motorola chippy on the bottom. They're surprised it's not a Philips brand. Of course we've got Philips down here. another one down here of course.

Note the these are all wave soldered. none of this sorry flow rubbish. You'll note the solder thieving pads on the end there. So this, when this goes through the solder bath, then you and you end up with the lay hand site they'd be hand soldered on after the fact.

That's all pretty, how you're doing and it smells pretty how you're doing. Could still smell the flux residue. Oh yeah, thank you very much. And they put the chip at 45 degrees here because when this goes through the solder bath, the direction of which is an indicator, but you might be able to tell.

maybe if you can see that on camera which one has the most solder on it. Mmm. Beulah So let you figure out which way this has gone through the solder bath here. you'll notice that that's got more solder there on these pins than that in there.

Aha, the plot thickens. anyway. they put it there so that the solder bath so that the pins aren't shadowed on this. you know, on one side they're not shadowed.

so all pins kinda sorta get the even soda bar so that's why. Unfortunately, the ones on the top though, they haven't done the same thing. so there you go, but that's probably you know it could be layout reasons as well, but obviously it's advantageous having those. and we've got large thieving pads coming off here as well and some ones on the side.

So there you go. Fascinating 2-minute teardown of probably more than two minutes of a Katiyal old that he bought for his pocket money when I was 9 years old. Awesome back in 93. Phillips When did we? You know when was the death of CD walkman I Don't know.

offhand, but yeah, it couldn't have been too long after that. I Suspect I Hope you enjoyed my Obaid Monday If you did, please give it a big thumbs up because that always helps a lot. And you can subscribe by clicking down here. Make sure you also click on the bell notification icon so that YouTube actually notifies you of new videos.

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