Hi, we're gonna check it out into a teardown of a white board. Yes, a white board. Stick with me. Thank you very much to Jan De Plume who said hey, I'm gonna send something cool the office I had no idea what it was and a white board turns up apparently I Jan Wasn't happy with the quality of the white boards I was using in my videos and said hey, like and here's a much better wipe.

Also, let's check it out. It's called the Justic and well it's a white board. It's white but it's got this extra flappy thing on it and that's what you are drawn the you know like I don't know. is it Alexian or some other you know plastic type sheet that is the surface instead of your more traditional white board surface underneath and it's designed so that you can actually put things underneath like this and then put them over the top and then draw over the top of that and you know that's pretty cool.

but problem with that is wow, it just falls down like that. So obviously that's no good. These things are permanently mounted on walls, so how do you get stuff to stick when you know to use this cool feature of being able to write on top of stuff? Well this is one of these newfangled electrostatic or electro and he Civ whiteboards and it's battery-powered so it takes four double A batteries. Let's whack some batteries in see what it does.

We'll put the last battery in here and tomorrow put it on there and I'm having a hard time pulling down on that. It's electrostatically stuck. Don't get hair stuck in this thing. It's nice I losing my head anyway.

Um yeah, you just wipe things in there and they electrostatically stick like that. and it actually requires quite a significant amount of force to actually pull that down. And so you can whack your things in there. you can draw or on top.

So I'm this is really cool. Probably? Yeah, yeah. use it for my whiteboard tutorial videos. It might get some like I'm not sure the exact size of this.

is it a zero? so might get some paper that I can stick inside of it. drew all my circuits on or whatever it is I'm talking about and then I can actually go over the top without ruining the original one. So that's the intention. Anyway, that's pretty cool electrostatic whiteboards.

Let's check out how this thing works. So yep, I can now cut off Really having a hard time budging that so that's fantastic. We can stick our stuff in there. no walk-ins, stick our stuff in there.

Bob's your uncle draw on top Beauty! So how does this voodoo work? Well, it all has to do with electrostatics and what's called the Coulomb force? Oh or the Kalama course is that a word? It is now the Kalama course between two charges. So any two charge particles are actually going to have a force. If you've got a positively charged particle q1 here, Well, it's going to be attracted to the negatively charged Q2, and if they're both positive, they'll repel. If they're both negative, there are appellative positive and negative they'll attract.

and you're familiar with this in everyday life. It's why this synthetic top is actually clinging to me. I can feel the static charge on me. It's electrostatics that actually forces these together.

It's how electrostatic speakers work at our ton of stuff in both engineering and nature. actually works. And yes, if you've got a capacitor, two charged plates, they'll actually be a force between them. I'll leave that for you at home to calculate the force between two plates on a capacitor.

but I won't go into details. But basically Coulomb force equation is our force in Newton's is equal to the Coulomb force constants. Just this magic constant. It's roughly nine times ten to the nine, and multiplied by the charge in coulombs.

because that's the unit of charge of any charged particle in coulombs. q1 times the charge in Q2 over this. R squared here nurses like a radius of separation. You can think of it as just a distance.

It's not actually meters as such, but it gets more complicated in this the theory. But and all this, the physics behind it all can get really complicated if you want to go down that rabbit hole. But suffice it to say it drops with a square of the distance. So if you have these two charged particles this distance apart, if you double that distance, the force drops by 1/4 So it's just proportional to the distance between.

and that's all there is. So this is how this electrostatic board works. But how does like? Okay, this thing that we're going to stick on here, this may be mutually do. This may not have a charge, so like we we can have one surface that's charged up.

but how do we get the charge on the other one? Well, let's take a look at this thing physically, how it works. And in case you're wondering, does it only work with paper? No, it should work with pretty much anything really. Um, take some alfoil. that's what we call it here.

our foil, no worries. and that is like that. sticks beautifully like I Try and pull on that. Get some parchment baking paper.

for example. That one sticks quite nicely. no worries whatsoever. Notice, not as effectively as the our foil, but still works right? So what I've done is disconnected the battery here.

We're going to use that surface DC voltmeter that you've seen before in the wireless and aesthetic myth-busting episode which I might have to link in at the end. Um, it's very interesting so we'll just reset that I've got it an inch away. which is it's calibrated distance so it's a kilovolt for a one inch. There's like a metal plate on the back and I've got a ground of this ground lead coming out here just to my mains earth anti-static bench mat.

it's going to jump around. We've got some stray static in the air, so let's plug that in, see what happens? There we go. What's going up? It's charging up. It's charging up.

Yeah, it's going up. -. And of course it's negative. It could be positive or negative depending on not just the polarity of the charges and we've got getting.

It's climbing up to upwards - two and a half kilo volts. So May like it takes some time to charge up the service. Perhaps maybe the internal hope or another high voltage generator should turn on? Pretty sweet. So I don't think that's an issue.

And if we just disconnect the battery like that, you see it's just going to drain eventually. back down. Maybe if I touch it like I'm holding on to the anti-static bench mat at the moment. Yep, there we go.

We can drain that surface down pretty quick. Sweet. But if we plug it back in, oh yeah, it's jumping around. and if I touch it.

Oh no. touching does. Actually loading that down does make a difference, doesn't It takes charge time to charge back up. If I just put the paper on, let's have a look.

Yep, Yep. because that it takes energy of course to pull. You know if forces are happening, there stuffs happening so it's obviously draining away the charge on that thing. Yeah, Yeah, it's still going to build up once that's on there.

But if we pull it, let's say if we just slowly pull it to the side. All right. I couldn't do it and we'll try our alfoil womp thank you very much, but it'll slowly charge back up. There you go.

So something on the surface of this thing is charging up. let's take a look at the surface. Now forget the light on an angle like this. you can see clearly.

They've got two contacts on here and then they've obviously got like a big printed I Don't know. Is it done as a big copper sheet? I'm not sure how they you know an adhesive back sheet or or something like that then with the white layer on top. Anyway, one of the terminals goes into this side of the pattern. Here you can see how the pattern is split into two halves.

There's like a four or five millimeter gap between these and at wiggle-wiggle-wiggle Year like that in there. and the other terminal goes along here. and this one actually goes all the way along. And sure, there we go goes up here and connects into the other side of that.

and it does exactly the same thing up here like this. So it's basically all these rows are in parallel. So then you basically got a, you know, a two plate capacitor effectively across here. Like this, just with this gap.

And then when you place the medium on top, it actually creates a more efficient path across here. And then you get the electrostatic adhesion, which is basically I'm not sure if it's the right word that it's conducted through the medium. So this is where the terminology gets a bit tricky because it's not actually conducting as such. it's an electrostatic force so there's not actually in theory.

There's no current flow. Of course we're going to have leakage and all the rest of it, but you know. and of course we're going to have capacitive charge. So there is.

You know, some electron flow onto the plates and things like that. I've done the infamous video of does current flow through a capacitor? It depends on the way you look at it. So yeah. but basically we've got think of it as a capacitor and then the material actually becomes sort of like the dielectric between them I guess and that and then that's involved in the attractive force between them.

So I don't know. any physicists out there want to correct my terminology by all means, so it's very cool anyway. I Want to crack this open? Yeah, you can pair it from an external wire plug plug back if you want. There we go draws one milliamp.

so they reckon about nine months battery life. So yeah, like for a say, a nominal 3000 milliamp hour capacity, you're going to get three thousand hours use out of it. Roughly So Anyway, let's take the screws off. See what's what? Uh-huh Couple of wires coming out and that's all she wrote.

So we're just kinda. It's not going to be hugely exciting. We're going to have a home this generator in there seven. Crack it open Wow it's not much.

Come on. I'll get out for you. Well I expected a Cockcroft Walton Voltage multiplier I've done a video on that I have to link it in at the end and that's what it looks like. We've got there.

We go. We've got the Diode capacitor arrangement going across and of course we've got a little switching mosfet, their little inductor, and little driver down the bottom is that. That'd be like the low is at the low voltage. I've got a low voltage indicator.

that's what the LEDs for by the way. Yeah, not much to it at all. It's exactly what you expect just generates a high voltage. Let's measure it and I'll tell you what nice attention to detail you can see that is conformally coated.

sweet. although you'd expect that on a high voltage. Our multiplier like this. So yeah, you don't want moisture and crap getting on the board upsetting the applecart and it's time to bring out the bad boy.

The Triplets 6:30 Fantastic! I've got a six thousand volt DC and AC range so hopefully it shouldn't be more than six thousand volts. So let's back it up to this and see what we get. And I was afraid of that. The triplet is too much load for this thing because a little pissant circuitry.

You know it just can't drive anything. So let's get our surface DC voltmeter here and put that about an inch away over one lead. Maybe we can get a differential? Yeah, I'm just eyeballing that. Let's let's call that a kilovolt.

Positive Kilovolt Move it to the other side talking at the right angle. Eyeball it again. you know, - the Kilovolt. So you're talking.

You know, like a two kilovolt differential on there. So that's because what we were measuring before wasn't the actual like on the surface. It wasn't actually the like the differential output across this. So there you go.

It's you know, roughly in the order of a couple of kilovolt. So that's what I would have expect the closer look at the chippies on that board for those interested. So they have it. This logistic electro adhesive, Electrostatic Colome Ik force white board.

whatever you want to call it. It's pretty cool. It actually does work. Apparently they have a patent on this thing, but a quick search couldn't find it.

If I do, I'll link it in. But yeah, it's just the two plates spread over the surface and that's it. There you put your thing on top, it becomes the medium between those two and it he is down. And there's quite a lot of force on this thing.

So I'm actually recently impressed by this. It works really well. A decent amount of battery life on it so it's not too shabby at all. So I think I'll use this for my whiteboard tutorials.

Let me know what you think about maybe doing some God I know how I can utilize this? Let me know and once again, sorry about the quality of this video. The lights proper lights still aren't installed or anything like that here in the new lab. so I kind of get what I get. So anyway I hope you liked it.

If you did, give it a big thumbs up. as always, discuss down below. catch you next time.