Hi. In the previous video, we took a look at this: mini wear Dt-71 uh tweezer Lcr me to stay on your bastard. There we go. No, no, why isn't it? Why isn't it staying on it? There we go.

I was going to say the tldr from it which is too long didn't read from the previous video. is that er, it's not very accurate. It's got limited resolution. It's got limited ranges.

Uh, there's accuracy issues between manual ranging and auto ranging modes for some reason uses non-standard test frequencies you can't use it while it's charging with this lead. And of course, yeah. Most complaints about this were like the charging system that you had to disconnect it and you had to physically charge it uh, separately. and the tilt head detection was uh, which by the way, you can actually disable the Hilton tilt head detection um in the configuration file as mini where uh actually pointed out.

So that's good. If you're always right-handed and you, um yeah, just don't want it to change, then you can fix that. So that's good. Um, it's lead testing is limited, couldn't do reverse polarity, and basically the secondary parameter measurements like the you know, Esr of capacitor and stuff like that basically didn't work.

Um, so there was a lot wrong with this, but it's 70 bucks. But as a lot of people pointed out, uh, 59. I believe you can get it for um, and not including shipping though at uh A Seed Studios. But the you know, the saving grace for this thing was that well A it's cheap and B was the gorgeous probes on it.

and a lot of people said that they should, actually, um, sell just the probes for this thing. You know, the batteries are in here. apparently. apparently there's a battery in there and in there.

and um, yeah, if they and charging circuitry in here and a little charging Led apparently. um yeah, a lot of people said that they would buy just the tweezers if it came with like a short lead that hooked onto your Lcr meter or something like that. So I think they should definitely do that because the probes are actually gorgeous. Anyway, a lot of people wanted to see a tear down of this thing and the reason I didn't do a tear down last time because I wanted to get the review video because in the manual it specifically tells you if you open this thing, you can't get it back together.

So obviously like this is all like ultrasonically welded together or something like that. But uh yeah, apparently. um yeah, this will be a destructive tear down. But anyway, I do actually have another uh like sub.

I think it's just under 100 bucks. Uh, you can get it from Mouser. It's a Global Specialties Lcr. I mean, I've got one of those on the way.

I'm going to do a review of that. and then somebody else pointed out that there's an Lcr research one as well coincidentally, another Canadian one, as well as these, uh, smart tweezers. Smart tweezers. Very expensive.

I've got the old model, they've got a new model, but you know it's many, hundreds of dollars and Lcr research in Canada as well. They actually make ones too, which actually come with a Nist calibration certificate. Very nice. Uh, for the price, but they're very expensive as well.

But they have a lower end model for 169 Yankee bucks that comes with a nice certificate and everything. So um, that might be worth checking it out as well. But anyway, I've got another one on order. But anyway, this video, let's do a tear down, shall we? And after we get the probes off, you can see in there that they're just the contacts inside there.

All of these Lcr tweezers they all pretty much either come with or you can get replaceable pro tips, because you know, sooner or later, after a couple of years, uh, heavy use, you're going to be wearing down those nice sharp tips. Take these screws out here and you can see there's a magnet in there. You can see the magnet in there, that's the attractive one apparently according to the 3d model. and then there's another magnet in.

does the do these come out? How do you? I don't know. I've got the screws off. Can I? uh, I might have to break it apart? I don't know. but there's you can see another magnet down in there.

That's what. Uh, repels them. So That's what. gives it a really nice, gorgeous feel.

And I forgot to mention that it looks like, uh, these are actually just, uh, two wire probes. Some of the more expensive ones I believe are like four wires so they'll have like a sense wire coming up there, so it just eliminates the leads in there from the test. But you know you can like two wires. Okay, for you know, something cheap and simple like this.

Well, I don't know what those screws do. Um, either side because I take them out and I can't get this apart. Anyway, So yeah, I might just have to do a a wishing bone thing. I don't don't really want to.

Jeez, I'd love to like. I don't know. All right. Screw it.

Here it goes. Come on. No. Is it still going to pull out? No.

No. Damn. Oh, I don't want to. no wanna to like.

Oh, there we go. There's something. Okay, there's a trick. There was a trick to it.

Okay, I think I had to get my screwdriver in there. Did I or something like a little spudger in there and oh, pry that out. Oops. Well this is interesting.

It's got some sort of like uh oh that that's a flat flex. Okay, yep I can see. Yeah, I can see the traces on it. now.

you don't often see like a black gloss black flat flex like that. But yeah, I can see traces in there now. So I believe that the batteries are in here. So yeah, looks like I can probably maybe pry that car.

It's not even glued or something in there. But anyway, we've got our magnets, so that's how they're connecting into the charging circuitry using these little flat flexes. Yeah, they weren't kidding that this thing wouldn't come apart. That's why they put in the manual.

they say yeah, don't try and take it apart because you won't get it back together and there we have it. 3.7 volts, 0.185 watt hours. Thank you very much. They're going to have one of these 50 milliamp hours in each side there.

So that's uh, the total capacity. Uh, as I mentioned in the review video, I believe. uh, like, uh, what is it? Uh, 20 hours of run time or something. So with the two hour recharge, Yep, two identical batteries.

But yeah, that was, uh, glued in that wasn't coming out easily like it was glued in at the ends here. And yeah, you just have to pry it all out. and there you go. The contact is just an extension.

uh, an exposed, un, unsolder masked, uh, extension of the flat flex there. So that's actually rather nicely implemented. As I said, I'm very impressed by the Uh probe design on this thing, so they put all their effort into the Uh pros unfortunately, and uh, the rest of the firmware and other stuff you know. and the charging system.

It leaves a bit to be desired, which is a shame because uh yeah, it really is a sexy bit of kit these probes. So yep, there's our two magnets that we got out of the arms there and watch this There we go there. The ah, they're the uh, neodymium magnets. Oh, either either side there.

so they're the ones that caught it. They're the attractive ones that sort of, uh oh yep. there we go. Oh yeah, yeah.

Look, I can actually rock that now. Whoa. Nice. So you can see it.

even though I go like that. it flicks it so there you go. You can see how that just draws those pros back together. So these two here, pushing apart counteract the force of these two here.

and it's just. it really is gorgeous. Yeah, if you just had these ones on their own, it'd be like it. like snaps, it snaps back.

But because you got these two in here, which then, uh, when you push it in, it doesn't just go, you know it doesn't snap like that. It's just. it's just gorgeously balanced out. and wow, you know, hats off to the mechanical engineer at E-design who came up with that because that is just great.

Okay, so these little aluminium side plates. they're held on there with some double-sided tape. Nothing wrong with that, I guess. Uh, and oh, there you go.

I can't actually get that apart, I actually tried to force it from the end here first. and uh. then I realized that the side panels will just come off and uh, and it's just clipped together. So so it is possible to get this apart without too much damage.

Although I've just damn. oh no. Ah, those, they're shield. They're shield wires.

Are they look. There's two exposed wires either side there that I I presume to shield use these as shields. Although were they I can't. I have to rewatch the footage.

Were they actually under the tape? So. but obviously that's deliberate. That is deliberate to shield those sides. I'm sure that's got to be.

it's got to be the reason, But it was a tape covering it and that'd be a fail if, like the designers went. oh yeah, let's be clever and we can use these as metal. Uh, shield side plates and then in production. Um, somebody's went.

Oh, we need to stick them on. Let's just put tape and then they cover it and insulate it. That'd be hilarious. Sure enough, you get those clips off and this bad boy, it's just gonna come apart.

Oh, there we go. We're in. Oh got some black gunk there. What are they doing that for is that you wouldn't need that for insulation.

There's nothing on the other side of that. There's no nickel screen in or anything like that. So yeah, oh, look at that. We can get the whole lot out.

Just comes out as one assembly. there. It is. Sweet.

That's actually three board construction. It looks like there's something on the back of the Lcd there. Let's yep. Yep, there's a flex.

There's a flex. There you go. Oh wow, look at that. Yep, that's how they get the small form factor.

Ah, there we go. That flat flex. I thought it was like embedded in the inner layer of the Pcb. but it's not.

That's actually. I thought that was gunk. That's actually, um, the part of the flat flex and then just going onto uh, the board there. So is that.

do they solder that on or is it conductive glue? I think they might. No, that's the. uh, no. they're the solder joints.

Okay, so they're the solder joints for the Uh. four pin Trs jack there. So we've got our four pins and then our flat flex as part of that, because they obviously couldn't fit all that stuff on the main board. I mean, as I said in the review video, like, why have they gone so small with this head? I mean, it just just didn't make sense.

And those wires there and there. Yep, very deliberately soldered onto the ground terminal of the Trs jack. There you go. So that was very deliberate outer case shielding.

but his shielding was important. Like you would like use like a I don't know, like a die cast alloy head or something. Maybe like a die cast like two part clam shell head perhaps. And there's your touch button.

It's just a metal mesh like that just bent over. Um, so yeah. it's like just a capacitive uh sense thing. So then there's got to be yeah, yeah.

there we go. A castellated edge. Well, it's not. It's not cascellated, it's a gold, uh plated edge.

Castellation would be the like. the holes in the side, but yep, they've just gone. Uh yeah. we want uh, gold edge plating on just that little bit of the board there.

Thank you very much. The Pcb manufacturer in-house will say, yep, we can do that. That's a separate process, no worries, just cost you a bit extra. Hi Yes, I'm back in the old lab slash new lab which I'm going to be moving into over the coming weeks and I have moved over.

My soldering bench which includes my uh, Togano microscope which we're using now and it includes my mantis, my soldering irons, and my Pc capture bench and everything else. In fact, I can show you. Hang on. Hang on here.

We go there. We go there it is. Hang on. Can I go Full screen? Can I go full webcam? There we go.

So it's yep. I've moved over precisely one bench so far. There you go and I'm getting stuff set up and oh sorry, you probably can't hear me. I'm way away from the mic.

I'm um, yep, starting to set up a few things anyway. So yes, this will be permanently set up properly. Um, soon. And so the acoustics are going to suck.

Until then, I'm going to do all the proper cabling, the proper acoustics. I'm going to set up everything properly and it's going to be great, but until then we're going to have to make do so. I just moved all the stuff in yesterday and I just cobbled together like there's just cables going everywhere to try and get this thing working. Anyway, let's zoom in with our tagano.

Even my remote control is not like I normally have it on the side of the bench here. and if I rock the bench, the camera is going to wobble because it's sitting on top of my Tigano arts. you know. Feels good to be back.

All right, let's go. And yes, the lighting's going to suck too, because I know it's uh, it's dark in this corner at the moment. Anyway, what do we got down there? We've got a Cpo 1017. Ah no, that's a Cpc's 1017..

there you go. That's an Xsr Optomos relay. So Photomos relay. There you go.

Um yeah, I need better. Like a monitor up the top so I can just like see. Like So when I've got a camera set up, I can just name it. Um, yeah.

All right. so we've got another. Is that a Discrete down there? Np 2300 Yep. Mosfet.

So we've got a relay switch in and a mosfet there. Oh, there's the Lcd part number for those playing along at home. So yeah, I don't know. Anyone want to reverse engineer that? There's four traces.

There's one ground plus three signal coming in on the right hand side there. and obviously they're all. They just connect through to the pins on the Trs jack there, so they're just soldering those directly on. That's the bottom side.

Version 2.31 402: They're not sure. I'm presuming, that's like a just a little, um, six pin Op amp something like that and Nbt 83. I don't know. You'd have to know your surface mount part numbers, but a couple of protection diodes there, I'd say, and a couple of resistors.

So that's interesting that that's basically in parallel with the Uh pins on the Trs jack. Hmm, okay, let's see what these are. Yes, you can see our noise on the image like grain noise. That's uh, due to the lack of light here in this corner.

I'm just using the Tagano number. Anyway, What's an A3 jk? A3 jk. I hate Smd part numbers. Anyway, Curiously, there's two of them.

Um, and they're just like, uh, in, they're just connected. I presume through to uh, a couple of pins on the Trs jack. So that would be connected through to the probes. Um, like basically straight through to the probe.

Sorry, if I'm too, my head's too close to the camera. This is scary. All right. I'm not getting anything for the Uh code for the A3 Jk code there.

Uh, well. yeah, I'm not with the first Google. Anyway, I've got a crystal over there and it is just a crystal. It is not a crystal oscillator because that's one big ass pad on the end like that.

So maybe there's some sort of like, uh, you know, instrumentation amp? maybe programmable gain? Uh, you know, one of those front end type chips? perhaps? Or just maybe a mux? Are they just like a mux and they're just doing everything in the micro which is going to be under there. So we're going to have to desolder a couple of things here. We're going to have to desolder this entire top board to see what the micro is. Bloody soldering irons aren't even plugged in yet.

Damn it. Okay, I've got hardly any tools here at all, so all I've got is a big ass tip and uh, a pair of tweezers. and that's about it. So I'm not sure if it's going to be easier to just cut those off because I'm not going to reuse this.

Okay, I do actually have a pair of side cutters. I did try and force it apart. That was a real mistake. So I'm gonna there.

We go. Um yeah, I think I did kill a part. Um, so he completely butchered it. Yeah, I think there was a stop 23 something or other in there.

Oops. Um, yeah. sorry, so I don't know. Its remains are probably down in there somewhere.

This is what happens when you've got like, just like a pair of side cutters and it's soldering iron and that's it. No sucker in sight. Oh no, there it is. Six, Five, Zed Y.

whatever that is. So here we go. We have a Pcb. We've got two like amps, something like that, amps or switches.

and on the other side Ta-da we got an St. No surprises whatsoever. It's a L43 or 432. They got so many bloody variants I have no idea what that is.

And there you have it. It's ultra low power. Arm Cortex M4 100. Uh, dry Stone Mips 256k flash, 64k of Sram.

What luxury. Wow. There you go. And uh, that has.

and it's got rich analog peripherals. Now that poor rubbish. Um, independent with independent supply? That's interesting. One 12-bit Adc, Five Five make samples per second.

Wow. that's screaming up to 16 bits with hardware over sampling. Wow. Two 12-bit Dac outputs.

Obviously they're using those. Um, so yeah, uh. they. so maybe like, is it just direct output and then they're just mux in.

Those chips are just mux in those. because if we go back to, if we go back to the video tape, yeah, there's nothing else on there. There's the micro. I don't know which pins are the dax you could look that up, but you know we couldn't be bothered.

really. Um, is that one going? Oh no. Okay, there's one going over to the board up there and boom. it's yet that's come in.

Is that almost coming directly in? It's coming under from the socket there. So they're reading that back. It's the it's under the chair. It's yeah, it's under there.

don't know. But uh yeah, there's not a lot to it is there? Anyway, we do have a little bit more on the bottom of this board. Got another jobby? What's that? Don't know what that is? Is that like a protection? Is that? Just like. I don't think that's an active part and that could just be protection.

Anyway, we did have another transistor on the top. There's our edge. Of course. There you go.

Now they've just plated that on the side there. That's our edge. Contact for our V is there for a bit of reinforcement. So yeah, there's not much.

not much in it. Assuming that's like some sort of protection device. Maybe. Then I'm going to say that it's well.

it's not quite doing. It's almost direct. Uh. dac output from are they using both dacs? Are they driving both? Um.

and then I don't know that one's either a Mux or an Amp Or one of those you know, front-end jobbies or something. I don't see like it. I don't think it's like an I Squared C in a Pha. Like it's not a serial interface or anything like that.

Anyway, so these are what these would be. range resistors and stuff. Uh, I would presume you'd need some of those, but yeah, there's not much in it is there. I mean, jeez, that's you.

Know it's a little bit over here, but that's just like some relay and mosfet switching. and maybe an amp. That little six pin Sot Jobby and it's about all she wrote. Wow! So you can obviously tell why this thing is a cheap and b its performance is not that great.

At least a bit to be desired is because it's just like you know, there's not a lot of hardware and there's no, you know, really precision hardware in here. Or something. There might be a bit. Yeah, the spec is loosey-goosey was it over a percent.

Whereas some of the top better quality ones like you know, twice the price um, are like double triple even. Or you know, you buy a 300 one. It's like five times the accuracy of these things. So much more.

Uh, they'd have much more precision components. don't remember if I did, I think I did a tear down of the old smart tweezers. one didn't I did. Anyway, let's have a look at our oled let's rub my fingerprints off.

Oh that didn't do a good job. did it? Now if you get this puppy in the right light. speaking of light, I do actually have a another light, but that's not gonna. Oh, there we go.

I can see. Oh, you can see the lines. Look at that. You can see the traces in there each column nice.

And then you can see the rows over there as well. There you go, Rose and oh yeah, look at that. so you can see the ridiculously fine pitch on those traces there. So they're our rows.

They're our row connections. and these are our common connections. You see them all in there. Wow.

It's hard to get the right light. Of course it's all about getting the light, but wow, you can really see that. So that is an oled display. Very grainy but you can see it and the mat.

That's the maximum 40 times optical zoom on my tagano. Okay, I've amped the brightness up on the only light I have in here. You can almost see like the 3d nature of them of the elements in there. That's pretty groovy, huh? Yeah, we can almost see, look, almost see the connections.

You can see the connections on the top. And of course there's a chip on glass cog it's called so that's the glass substrate and that is one big die. That's one big silicon die not that bond wire rubbish and that's just flipped over and connected directly on the glass. And then all of the rows and column drivers.

Looks like all the rows go up here connected on this end of the chip besides the interface or your interface connections coming over and then all down around here, that's all your column drivers. So what's up? I think it's 96 by 12 or something, isn't it? So yep, it's got to have like, you know, 130 pins or something in it. Maybe. So there you have it.

That's it. I'm sorry about the poor image and audio. uh, quality and setup. Yes, I could eventually put the green screen uh, behind here.

although it'd have to be a fair way back because it's an elgato. uh, green screen. It's like two meters wide or something, but I can actually put it at the back there and it could go on. but then I'd need a gap between my benches to actually do that.

Hmm, I might have to put a gap between. Oh, but then I couldn't have the continuous role of Esd. Like there's so many things in, like setting up a lab specifically to do the kind of stuff I have the huge variety of stuff that I do. So anyway, yep, that's it.

If you like the video, please give it a big thumbs up. As always, comment down below and over on the Ev blog forum and you can actually follow Supporters have already seen like discussions about moving into the new lab and things like that including like you know, there's even financial stuff, but you can also see those over on my library channel as well even if you're not a supporter. So there you go. So that's it.

I'm out of here. Geez, this really looks big, doesn't it? I'm just looking at there. there's my huge nose look at that and uh, yeah, this looks really deep. It's not.

It's 50 square meters half the size of my current lab, but I'm going to save 40 000 a year. Beauty. Catch you next time you.