Hi, welcome to Tear Down Tuesday Why do I have a Yankee Five Buck note here one of these Funny Money cotton based crappy notes in God we trust? Well, uh, it's a good question because we have for today's tear down one of these note validators or Bill validators or V acceptors or uh, note acceptors whatever you want to call them. Um, the one that you typically find in uh, you know, vending machines and uh, things like that that accept your bill, your feed your hard-earned money in there and it either accepts or rejects it and uh, detects whether the currency is legal. So I thought we'd uh, tear down one of these. Could be rather interesting.

This one is a money controls. Um, they're one of the uh, uh, probably not one. They're not one of the major manufacturers of these things, but they are one of the uh, reputable reputable manufacturers. Anyway, um, of these uh, Bill acceptors Bill validators.

And this is the Um Mc26 100 model that we've actually got here. and there's a lot of Art and Science which goes into detecting whether or not a note is uh, genuine or not and it's going to vary between uh runs of notes over uh, time. They do, actually, uh, change things and different currencies as well. I mean this silly us.

uh, cotton based funny money is just, you know, crap compared to like in in terms of security compared to a Australian designed technology designed in Australia By the way, these are polymer Bank notes we've got in Australia I mean we basically don't have a counterfeiting uh problem here in Australia because we use these very secure polymer notes. but uh, sort of actually detecting uh notes like this. Going to use uh, different Technologies or can use different Technologies to this? uh, simple US currency. Is it that simple? Well, they've got uh, as you might know, they've got hidden water marks in there.

They've got security strips in there which fluoresent uh, different colors I believe under UV lights and you can tell the bills apart that way. They use magnetic inks of course. and uh, even some of the water marks with the magnetic inks. they can resonate at diff, you know, resonate a uh a uh a detector circuit at different frequencies based on what type of uh node it is cuz not only do you have to determine whether or not it's a you know, genuine or fake? no, but you have to determine or the unit has to determine the currency of the bill as well.

Is it a $1 A $5 A $10 A $20 you know, whatever. So um, as we'll see, there's various Uh technologies that goes into this and you can easily see this. For example, if you just, uh, really light up these notes from behind, it's uh, it's not hard to actually. um, see, see here we go.

There's a hidden five in there. for example, you see that Big Five in there, which isn't of course on the reverse side there. so that's you know, there's an inbuilt uh Watermark right there. And of course there's the strip.

You can see that I'll zoom in. you can't see it on the note. it's basically right down there. but if we shine that from behind, you can see it's got USA 5 on it and that security strip goes all the way down there.

and I Believe Believe. Don't quote me on this, but that fluoresces under a different color under UV light. And they can use uh, infrared detectors and all sorts of other uh detection mechanisms to to detect whether or not these bills are genuine. See, there's five going down there.

You can see the see the water mark in there. So 555 plus the security strip. That's a at least an absolute minimum that they've got going in these Us $5 notes. And as I said, they do, uh, change things up occasionally.

So uh, these Bill validators occasionally have to be updated with uh, new firmware. You know they may not accept the new 2013 $5 bill for example. So you got to go out and update the firmware for this sucker. But yeah, um, so something like this uh note validator here is going to use various Technologies so I'd expect and uh, dimensions of bills for example.

they're probably going to, you know, make sure it's the you know, the exact uh size and things like that as as a minimum. So really, we expect to find quite a few uh sensors in here and as you can see, they've um, obviously there's like one main control board in the back here. it's got various notes, we'll take a look at that, but it's got like a sensor module down the bottom of here, underneath the or as part of the slot and then they've got a cable running over there to the main board like that and this money controls unit basic uh, dip switch interface and then the vendor. You know, the person uh, who owns the vending machine can just you know, set it to accept various notes.

It's designed to accept one5, 10, and $20 notes no higher. and uh, yes, it is a used unit I Don't know if it actually uh, works or not. it's obviously been, uh, pulled out of a unit, but anyway, you can, uh, enable and disable the various currencies and then uh, this is a very simple uh, pulse interface. One it has, as we'll see on the other side, does have other interfaces as well, but basically it can just give out one or four pulses per dollar.

So that's how other circuitry the machine can actually detect things. so you put your note in there, doesn't, uh, give change or anything like that. It just accepts the note and either puts it in the cash box in the back which we'll take a look at or just, uh, throws it back out. And it actually came with the cable to hook up to it and it just, uh, plugs into here.

I Mean it does have serial interfaces. There you go and it's got a Uh download Diagnostics as well you can. For this particular brand, you can buy a diagnostic box which hooks up to the PC and you know, allows you to extract data out of it or change it. or maybe even update the firmware uh, remotely.

I'm not entirely sure about that, but this one can be as simple. This one's a 120 volt AC model. You can get Ones based on 12vt DC and stuff like that. so that just plugs in there and all we've got is basically 120 volts Ac in and just a relay contact out or a, uh, you know, a pulse contact out which gives the number of pulses based on the bill and whether or not it's accepted it.

That's it. So incredibly simple interface. Just uh, four wires plus ground. So obviously the bill goes in the front.

there. There's a sensor board in there which actually detects all the stuff. There's a processor board in the back and then this, uh, big thing. looks all complicated, but it's not.

It's very simple. You just release that clip and this is the money box. There It is that just, uh, it's got a couple of Springs in there and that just fills up with money obviously. Um, I'm not sure how many actual bills you can fit in there I don't know I don't know what's the average thickness of a bill? No idea, but you know you might get 500 or uh, bills or something like that in there, so not sure how that would how long that would last in a typical uh scenario.

But uh, there you go. There's the diagnostic, uh, stuff for it. and yeah, and basically they've just got some belt and pulley which then suck the note through here. I'm not entirely sure exactly how I assume this one if it rejects, it will spit the note back out, so maybe it only comes par part of the way in.

Uh, cuz it's not like the note sort of pops out the back here and then either gets directed into there or spat back out. so it probably comes like halfway in. detects. if it doesn't detect that it's a valid bill, it just reverses the motors and shoots it back out the front.

But yeah, that's all there is to it. Um, mechanically. Um, you know. Pretty simple.

and if we take those four, screws off the front bit of that. D Yeah, bit of dust in there, smells. but. uh, we're in and we have our first look at the main board.

there. that's the bottom of the main board. They've got. uh, very nicely aligned SMD resistors there I Rather like that, they got a flat Flex cable going into it.

Looks like they got a top sensor board and they're the uh status leads there. They I didn't see that, but they obviously uh, poke through the front and that's what we had on the back here. That's what they had on the unit. the uh, back of the unit here.

the Diagnostics maybe I should actually power this thing up before I uh, take it apart just in case I goof up some of the Mechanicals or something like that I think I might give it a go. Okay, I think I've got the pinouts correct. This is of course a US 120 Vols AC 60 HZ So I'm using my um, uh, variable frequency converter here to uh, generate just that. I've got the ground wire hooked up as well, so hopefully the magic scope smoke doesn't escape.

Let let's give it a go. Who? That sounded good. All the motors went so let's whack in our funny money. I don't know which way up.

Ah, there we go. It gives you a photo. the head I Guess there we go. Let's let's give it a go.

Give it a bill. Hello, it's not detecting. it's not detecting my note. No, no, a fail.

Oh, there we go. We had something there. we go. No, so it's obviously rejected that straight away.

No, there we go. a What? I did there is, uh. flicked a dip switch on the side here, which just changed it from the pulse from Vendor seral to pulse protocol. So maybe you know that's what was going on there.

but it doesn't like my $5 note as all at all. I've got two of them them so I'll try another one and uh no, it does not like that in the least. no of I'm pretty sure the note has to be up there I mean you know Yanks are probably laughing at me because uh, our our ones here pretty much, um, accept the bills basically in you know, any, um, any orientation at all. but yeah, that's not.

No, it's just rejecting my $5 note. Unbelievable like it I don't know. Is this a new note? I don't know when was it manufactured? you know you'd have to know. like does this support the latest, uh, firmware for this $5 bill? I've got $5 enabled on the dip switch on the side, but yep, it's not accepting.

Bummer. I have to be properly vertical. Is there something going on there? No. sometimes it doesn't go in all the way at all.

No, no loser, it's kind of doing the business, but it's not accepting my note. Bummer. Now let's just have a look at the back of that when we shoot that bill in shall we and see what uh yeah as I as I thought yeah it goes like partial way in and then so it doesn't feed it all the way in, only when it accepts it and it gets to that point, it processor accepts it. Will it? uh, feed up the whole way and then uh, put it in the um, the little storage container I Just popped off that top cover there.

Easy. We've got some uh, cutouts in the board here for three large caps there. and of course, there are obviously a bit of a premium on Space there. So, and there's not much circuitry on the board, so they've decided to make some uh, cutouts there.

Um, not. uh, you know, not uncommon for space sensitive applications to do something like that, but uh, let's get the rest of this board out. and uh, we'll take out these uh, ribbon cables here and see what's on the top side. Sort of levered that out and it looks like they were held in with Clips So this board should just H pop out too easy.

There's one more cable or a Lat semiconductor part. We're going to have a good look in here, but check that out. Hey interesting. It's a rather interesting board.

You know there's quite a bit of uh logic going on happening over here. There's a lattice uh PL. Over here there's a 60 800 processor which we'll take a look at. There's the Um prom obviously for the thing and uh, basically we're in Sandwich sort of in the middle.

Here is the Main's switch mode power supply. Obviously, there's our switch mode Transformer There there's our high voltage caps. uh, 200 volts AP pop and um yeah, I mean you know? input fuse there and we've got some protection and but we've got I mean obviously, you know, not a huge um sort of thought given to differentiating or isolating the sort of you know, the low voltage stuff from the mains. uh, side here.

so I mean there's you know, the dip switch sort of right next to the main input um filter caps? you know, you got to. It's crazy. Anyway, we've got some uh Regulators you know, some low voltage Regulators low side Regulators around here. maybe they're like some little opto couplers or something like that for the digital Out: I mean here's Main's input here.

so it's popping in here. so yeah, it just looks a bit real. You know it's a just messy business I sort of. you know, not huge amount of thought has uh, gone into that sort of, you know, hack and slash kind of design I think Anyway, we've got ourselves a couple of optical detectors here.

This one here is for an optical encoder wheel down there if you can see that properly so that obviously turns around with the motor just to ensure I Guess that, uh, a bit of feedback to ensure that yeah, the motor has actually turned. and the thing you know, maybe for slipped bills or uh, or something like that, perhaps um, some sort of detection. Another one here, which, uh, you know, mates up with uh, this over here, which I'm not sure that just looks I'm not sure how that moves at all. that little plastic.

It's just like a plastic tab. so I'm not quite sure what that one's doing there. Maybe some sort of you know this thing's going to have, maybe you know, a little bit of anti-tamper uh stuff in it as well. but uh, I don't really know what that's doing I mean strange.

What does it detect? that this whole mechanism has popped out of the bottom? I Don't know. Now that firmware sticker might explain why. uh, possibly it didn't accept my note. One of the reasons.

um, look, it's uh, dated 2002. so 11 years old. Unless they've you know, unless the sticker is old and it's ref flashable or something, let's have a poke under here and actually have a look. yeah, that's really crusty.

Looks like it's been on there for 10 years or more. that's for sure. Let's have a look at what we've got There you go. It's an Am29 F2 So it's a 2 megabit uh, parallel flash.

um, prom. So yeah, it's it is ref flashable. but I doubt it has the uh, internal ability to, uh, reflash remotely. um You probably have to, uh, take it out, whack it in your programmer and uh, do it that way now to understand whether or not that flash chip contains the actual firmware for the processor or maybe contains uh, you know the uh, all the data and the images and all sorts of other stuff.

For the various Uh notes and things like that, all the data seems a bit big for that. Um, Anyway, to figure that out, we need to to take a look at the exact typee of processor here and they've got a motor rol now. Free scale of course M classic um MC 68 Hc11. but of course the Uh 68 Hc11 comes in oh and endless varieties.

um so you know some contain internal prom, some don't e squ prom this that they come in a million different types. Well, this is actually the F series chip and you can't confuse it with other serieses like the E Series different again and so you've got to look at the F1 and then the CPU 5 after that. So we need to go into the data sheet and have a look at the specific type type of Chip to see whether or not it contains an internal ROM or not and I check the data sheet which I will link in down below for this thing if you want to follow along at home. Uh, no, this one does not contain an internal ROM although it's got an internal uh E PR only 512 bytes.

it's got like 1K of s Ram Not a particularly uh powerful processor at all. Does have a built-in um 8 bit multi Channel ADC though, which they're probably using for some, uh, probably using for to measure some of the sensor stuff. so we'll have to check the other chips to see if there's an external one there. But yeah, they're possibly using that.

So obviously this is the firmware for all of that. And I was going to say that, you know, because we've got a lattice. um, uh, PD over here. Maybe they could have interfaced the memory through that to sort of, you know, externally program it and then sort of, You know, route it through to the CPU here.

but by looks of that, no, it's just going. it's just going direct. I Can't see anything on the back there, but anyway, internal layers there, but that's no, it's running straight over. So I think to reprogram that sucker, we need to uh, you know you need to pull it out or the uh, you know service tech comes along, pulls it out, ref flashes the chip, and then updates it for the latest currency.

So most likely yes, this contains. unless they didn't change. The sticker contains the firmware from 2002, so any notes after that, if they have changed, this thing likely won't accept them. And the plld here is an old lattice.

uh Mark 4 PL Only 64 macro cells. You know, it's pretty tiny. not much doing there, but uh, obviously they need it for some sort of, uh, glue logic in there. Not sure what, and we've got ourselves an Issi external SRAM there in this case, 32k * 8 big whopping SRAM cuz this thing doesn't have much as I said like 1K So obviously they're using the P or some sort of glue logic to uh, maybe, uh, you know, get that into the processor although should be able to just, uh, whack that straight on the bus for the Main's power supply.

we've got ourselves a power integration uh, top switch device the top 247 R and that's just a uh flyback controller. There's our flyback Transformer down there and uh, you know, nothing special going on the main side of things. There just got a fuse on the input there common mode choke. our Bridge rectifier is four separate diodes underneath there, our filter caps and then our main flyback controller and Bob's your uncle.

There's our feedback opto couply hidden under there and uh, as I said, just very messy layout. I mean I don't like it at all. look at, it's not over near here near the photo interruptor and it's just ah, it's it's terrible. awful layout.

and the only other thing of note on here is this: uh, Texas Instruments TV 56 uh 29 and that's an 8bit uh Dack probably not a huge surprise to, uh, find that on there. So they're using the Dack to uh Drive some sensor stuff probably and the built-in ADC as I said in the Uh Hc1 over there reading that back, but whole bunch of uh, transistors. Not sure what's going on there. Maybe that's a part of all the sensors and what's that little sucker? no idea.

Looks like a 74 HC 14 There, we've got. You know, it's part of the uh uh secondary power supply here. There's an Lm324 by the looks of it, and this A 2595 is just an 8 channel open collector uh driver. like just like the classic uh, Uln 2803 three for example.

but you know here it is over here. it's obviously driving the output pins. but where are they I Mean they're all the way. all the output connectors all the way over on this side of the board.

Crazy. and same with the Max 232 driver. I Mean where's the connector over here somewhere? and actually just with the layout of the board I Just noticed something the you can see. You know it's a multi-layer board.

You can see the internal, the darker Green in there you can see that it's flood filled all the way through, even all over this main section here. Complete ground plane, right around the whole blink and lot. and that's also. you can actually see that, um, a similar thing happening on the top.

I Can't get a good light angle on that, but you can see it. definitely happening in here. And here's the mains input here, right? This connector here here is the two Mains input right? You know, active and neutral? There it is. There's the ground input.

Of course, the ground input is actually connected through to the ground plane on the bottom. and they got this Trace running over here and that's all connected. so the ground is connected through. And of course, this is a flyback uh Main's power supply.

so the outputs are going to be isolated from the mains. but look at the clearance. look just around the pad. there.

Are you? me like? the person that laid out this obviously has no clue about the A meeting any standard I guess and uh, cuz I don't think I Think it's unlikely to and um, you know, be just had to lay out boards for clearance? I Mean it's just an absolute mess and to have one solid ground fill all the way with just that little pissant amount of clearance in there? What is that? You know? a couple of millim got to be me. All right. Well, enough of the PCB cuz there's nothing really on there. It's a processor with a Dack and an ADC and maybe a bit of analogy stuff.

and that's about it. So let's see if we can get into this. um, sensor part. I Think that there might be a top and a bottom board there.

You can just actually remove the entire sensor thing like that and uh, lost some pulley and things. oops Oops yeah. I did take out a few screws and well, I'm a few screws loose. Sure enough, there are two uh sensor boards in this thing.

This is the bottom sensor board and nothing special on the back side there. It's just a double-sided board and uh, it looks like there's no huge amount of circuitry in there. but we've got a couple of Uh leads and things. We've got our um Edge our Note Edge detection here so you know clearly they we've got a lead here and a photo transistor over here.

so as soon as you put the bill in, it interrupts that and it knows to uh uh, then uh, feed that through with the various Uh rollers on the uh, top and bottom side. Here here's the front rollers which I've actually taken out. they little tiny rollers like that and they got Springs in behind those. so yeah, it can then start.

Once it detects that bang, it just starts pulling it through and at first glance this looks just to be an optical solution. Really? I mean we've got some leads in here and uh, basically three by the looks of it. actually not sure what's under there. not sure what that top part there is I don't know.

but yeah, they seem to match up with the sensors and we'll have to get this board out in here of course. but they seem to match up with the sensors on the other side which makes sense of course, because they're going to be uh, shining, uh, various uh wavelengths of light either visible or um, uh, UV or infrared or a combination of all uh three with the different leads through the notes to actually detect things as it goes in. but nothing hugely complicated at there at all. I Actually don't see a magnetic uh detector at first glance.

Anyway, let's take the board out there. you go. There's the top side of the board and uh, it looks like it is just an optical solution as I said because look, we got a Uh LED here of course, which is um, you know I don't that could be the IR one I'm not sure, but we've got an interesting angled like uh, you know, photo transistor or some sensor down in there and it's on like a 45 angle which is rather interesting. It'll be interesting to see if that's matched on the Uh top side and why it's actually angled like that.

Then we've got two extra leads in here. Once again, they will probably be matching on the other side with the uh photo transistors over there to actually detect that. So yeah, really. I Don't see any magnetic unless it's on the top side board.

um, on the bottom side board here I Don't see any magnetic uh detection at all. And as far as the chips go, we've got an LM 336 2.5 volt voltage reference there, and just a couple of dual opamps LMC 6062 and LMC uh, 662. so really, not much doing at all. couple of transistors there, presumably for driving the leads at quite a high brightness I'm assuming apart from that, that's it and that plate on the top side there I Maybe had a thought that maybe it's some sort of filter or something, but I don't know I think it's just likely just masking out um, the uh uh, extraneous light perhaps Now I've got the top sensor assembly here and that of course, just uh, fits in place over there like that.

and it. the note just goes between the two slots there and then just pops up. Looks like we've got some other uh leads slash sensors there. Yeah, there we go, there we go.

There's a couple of oh no, they're just oh, it's it's a light pipe. Okay, that looks like it just might be a light pipe cuz this has no circuitry going I don't know are is there circuitry going up to that? No, that just looks like see, there's no wires I mean uh, sorry. so that just looks like a light pipe feeding in from there and coming back out there. So the board, the top sensor board is in here and uh, yep, they probably got an LED and a photo uh transistor on the other side and then just detecting that the bills actually made it through there I don't think that's uh, part of the uh validation.

Uh, of the note at all. But anyway, if we flip that open, we can see that they're essentially duplicates. Oh no, there we go. one side, they aren't lined up there.

we go. so they're They're different alignments there, so two different combination of LED and then sensor. So that's why they put that in to mask out the light from one side to the from one side to the other. So there's two paths there that they're try trying to read.

There's one One path lined up with the note there and one from the other and we probably saw that that's probably the internal strip. Um, perhaps lined up with the Uh lined up with the text on the internal strip? I Don't know. Um, but it looks like exactly the same array with the lead and the sensor and two other leads on the sides. They look like leads and those down there if we can see it, look like the two matching photo transistors as I said yeah.

so we get in, looks so looks like there's four Optical detection P four Optical detection points this one here, this one over here which just go straight through the note and then two separate paths across the note there. So I don't know, you know? Feed that sucker in there, feed old Lincoln in and uh, what do they line up with? I don't know. not much. your guess is as good as mine.

Exactly what they're actually. What points of the note that they're actually detecting along the path there. There's a good look down into that photo diode there and that is one big ass sensor D on that thing, that's for sure. With a uh, nice Clear Window over the front, it could even be uh, uh, you know, filtered in some way.

Who knows. But uh, yeah, I mean is that a UV or is an IA R1 I'm not entirely sure, but they're obviously quite serious. More serious with that one than just these smaller ones. There's the smaller photo diodes down there that does look like it's got some sort of, uh, maybe some sort of filter.

A lens there? perhaps? Not sure, but uh, it certainly is different. I Mean this one is much much clearer and you can just just see the uh, gold inside there. This one does look like it's or maybe it is. No, maybe it's the same.

Maybe it is clear and it's just an optical illusion really that it looks like there's that COA in a different color. It could just be completely clear. oh sorry. I Completely forgot these two extra leads over there and there.

So they got a couple of. so they got two extra points there. so sorry, 1, 2, 3, 4 and then five and six separate Optical detection points. There we go.

There's a much better view. There we go. We got our metal can sensors here and then we got our three dodes here. And those ones, those little suckers.

um, yeah, they're are most likely based on the color. of course the uh UV Um sensors there. and these are the Um I I you know they could be infrared or whatever I don't exactly know we have ourselves was a part number there, folks. s67 Hf2 1902 Brilliant to Google and sure enough, that's a silicon x uh photo diode.

Found the data sheet real easy. I'll link it in down below uh a spectrum range of 400 to 1100 nanometers which puts it uh covers basically all of the entire visible spectrum. Plus, the infrared up at the higher part doesn't do ultraviolet so clearly. um, these two inner sensors here.

so this will be an infrared uh lead of course, and uh, infrared photo diods. but unfortunately, the part number is going to escape us on that. but just by the color of that and the fact that I know that uh, you know these note validators uh, do often do infrared and um, ultraviolet uh UV stuff as well. Then um, that's clearly you know almost certainly.

UV And there's our upper sensor board, once again, practically identical except with matching sensors. So on this one, we've got our infrared diode, our infrared photo diode, and which the other one sort of uh, goes about here on the other side of the board. so that gets those two strips in there and then uh, we've got ourselves our um photo transistor over here and over here. which uh made up with the Uh lead on the other side on the other board and then likewise.

these two Leads Here match up with the photo diodes on the other board. so it looks like we could have three wavelengths Opera in here. uh UV this is most lik the UV sensitive uh photo uh transistor there and it's definit like it's a photo transistor Arrangement you call it cuz it's actually got the Q designator down there instead of the D designator by the way. that's why you know this one is actually a photo diode.

so they have actually called it D down on the designator there. these are likely infrared, but they could be, you know. um I I I don't know, you know, you would have to know What that particular lead here is cuz these are quite broad range. They can do anything from visible as I said up to uh the infrared range.

No problems whatsoever. so but likely two infrared ones in the center. There maybe some visible stuff happening over here I'm not sure, but you know it could be other uh wavelengths I'm not entirely sure, but these are almost certainly UV and well, Bob's your uncle, that's it. Um, as I said, there are a couple of Uh leads on the back here, but they I'm pretty sure they're just uh uh, actually detecting that the notes actually gone through and not the fact that because that's that's a position and if we go back to our first board here, we can see the edge detecting this is obviously our first Edge and then on our top side board, we've got our second Edge detection with uh, this diode and that light pipe just feeding back over there.

As I said before, that just uh detects that the note the second Edge So it knows how far the note's gone through. As soon as it hits that point, it knows the timing to turn on the leads and read the data back at a specific point as the note goes through. because you wouldn't do it over the whole strip, you'd only do it at at a specific point on the Note which has that particular uh security feature that they're trying to read. So actually, I'm a bit disappointed that that's all we found really.

I mean basically, we've got um, six different uh detection points there using you know, at most three different uh wavelengths of light. There's no magnetic uh stuff happening there, there's no width detection by the way of the note, or um, anything like that at all. So um, yeah, this is a pretty rudimentary uh B seum. And of course people are going to ask, well, how easy is it to, you know, fool these sort of things? Well, I'm not entirely sure you know you'd have to do a lot of test, but considering that you know no magnetic sensor, it's just you know some Optical stuff I Don't know, Maybe it.

um, you know, if you're really, uh, got down to it, um, you could, possibly, um, try and fool these things perhaps. But by the time you went to that effort geez, I don't know to get you know a 20 Buck thing out of a vending machine? I Jeez, not worth the effort and I won't bother. uh. taking that apart.

there's nothing in there I Mean there's two Motors that's what our two wires hanging out there for. That's you know. Nothing special whatsoever. It's got that.

Optical encoding feedback. uh, positional wheel as I said, but that's about all she wrote. So there you go. I Hope you like that that's what's inside a pretty rudimentary I Mean the more modern one? a more advanced one is going to use lots more advanced technology than this one.

I mean there's no image matching. There's no camera. There's no, you know, nothing like that. which you might possibly get in a more modern one, but you know it does the job.

Maybe just for a simple, uh, vending machine that, uh, just reads um, six points at various light spectrums and well, that's all there is to it. So there you go. Um, if you want to discuss it, and if you got any more info on, uh, exactly, you know, might what might be going on in the various Us bills cuz I don't know, uh, us, uh currency that stupid funny cotton Funny Money stuff I don't know about that. but anyway, if you got any, uh, more detail on um exactly uh, what's going on here, please let us know.

it could be interesting to, uh, you know, power this thing up and get the uh time in and figure out what the wavelengths these leads are actually working at. and uh, stuff like that. um uh, maybe I could do that in a second video we'll see anyway. if you like tear down Tuesday Please give it a big thumbs up.

and if you want to discuss it, the Eev blog Forum link down below is the place to do it. That's down below on YouTube down there there or if you're watching the embedded version on Eev blog.com then the links are going to be up the top there. but because you're looking at the blog website, you already know that. so I'm wasting my time.

Catch you next time and I still can't get over the layout of this power supply. It's just awful.