This rather odd Contraption is a bumble ball. It's a kids toy, but it's quite a fun and interesting device. and it does have Electronics in it and that's what we're going to be taking a look at. So the idea of this device is that when you activate it and there's a push button here to do that, it will run for a set length of time and if I put it on the table here I don't know if it's definitely I'm going to put in the hands, it's probably best.

but the idea is it starts bouncing about and uh, on a hard surface. It makes a lot of noise because normally these little rubber feet are soft, but these ones are actually quite hard. It works fine the carpet but on the bench here it really rattles about. makes a lot of noise.

But anyway, and this one incidentally came from a UK seller B&M home stores, but they're available all around the world. Usually there's just one screw, but this one has three, one screw and a bayet cap system that you know basically you undo that one screw and then physically just twist it off. This one doesn't have that, it's more screws, which means that it's never going to have the batteries changed. Mommy and Daddy are never going to do that inside.

We have the Uh battery pack here and the battery pack actually acts as counterbalance. we I'm guessing this is the motor in here with the gears onto the side here and then we've get the batteries as the weight and that's what is basically quizzing around inside. I Can show you that by pushing this, it's not going to stop. Know? is it right? Tell you what? Um, I'll just wait for it to stop, it's stopped and then I shall pop this little clip up, take the batteries out, the generic batteries that are stuck in it for the test, and then we shall disassemble this.

H Now can I just take it apart? No. I'll take the whole thing out. It will be a journey of Discovery into children's toys. So this comes off and this comes off.

Multis screws quite complex really. I Thought it would be a simpler construction, so this is quite a good start. Okay, right. So let's just start randomly taking these screws out as well.

This is a bit you can skip across if you don't want to see it. and this is also where you're going to see a gearbox just disintegrate into pulp. probably. I Got one of these a very long time ago and it had that different construction.

This one might just be optimized for safety. I'm not really sure. It doesn't seem like it' be optimized for safety. As such, couple more screws in the motor area and then are we going to have an explosion of COG Wheels I'm wondering if I should actually pop this thing out here.

I should take this last screw out. It appears almost to be a locking screw. Is that going to come out? No, it's not going to come out right. Oh, and that thing? Oh no, it's not going to come.

Oh there it goes right here. I Could zoom down this now now that we've got the bulky bits out of the way. I Think the first one I got had a little toggo switch you pushed in and it didn't turn itself off. Lots of filtering.

there's the circuit board with an overcurrent device in it. Wow, right? Tell you what. I Think we have to explore this a lot more. So there is the switch mechanism.

There's a little switch down here that is pushed in by the button being pushed on the side and it doesn't matter where it is around that it will push that in. Oh, God has pushed it right in and uh, it pushes that little contact there to actually signal to the control. PCB it's to run. Yeah, look.

two inductors and the capacitor. They've gone Town big time on the filtering here. Wild? Okay, right? Well, I'll take this stuff out and we shall explore the circuit board one moment. please.

Reverse engineering is complete. Let's explore and by far one of the most odd things about the circuitry is the amount of protection added for the motor stalling and also interference suppression on the motor. They've really gone to town. Look, there's two inductors 6.8 micro Henry in Sears of the motor and then there's a 1, 2, 3 100 nanopar capacitors and I should show you their their position on the schematic.

Other things worthy of note: there is this little uh PTC thermister here that is an overcurrent device. Not quite sure what its rating is, but I think it's round about an amp although it held at an amp, but they would do. it takes be a while for them to warm up I tested that. Um, right? So the supply comes in and there is, well, one connection.

The positive connection goes straight out to the Uh motor and then across the motor. not actually on the motor itself, but across the motor. on the circuit board is a capacitor. We've got a short KY diode to decou the supply there from the rest of the circuitry.

We've got a smoothing capacitor here H I should draw that in, hold on I should draw that in right now, although it's on the schematics so that should be fine. Um, so we got smoothing capacitor and then a little decoupling capacitor and then the chip I drew a blank in the chip 218 M Lots came up for that. In that package, that chip has a button input going to the negative connection the Zer volt Rail and then it drives a Mosat and the mosfet has a 10K pull down resistor. Um, there is a current limiting resistor 68 ohms.

and then there's the Uh electronic fuse which I should also draw in here. why don't I Just just finished doing the job before starting the video. That would be so much better. It's on the schematic though, it doesn't really matter.

I'll just write PT c in there and then that goes to the Mosat that then switches the motor. Uh, other things worth mentioning. On the back of the circuit board, we have this resistor here has a little bit of a heat sinking on the Uh PCB in the form of these. This pad in the back and also this pad here and the mosfet.

Its main switching pin here is also covered through plated through holes to a heat sinking plate on the back. Let's take a look at the schematic, shall we? with its weird motor thing I should write also in the middle of that 2118 218 Okay, the schematic. It's not super complicated. Let's get a little tiny bit closer.

Here are the three ablea cells that give us a supply of 4.5 volts that go straight out to the motor via the little 6.8 microhenry inductor through the motor. another 6.8 microen inductor. Then we've got 100 nard capacitor across that for Uh protection probably the MOs fet just by clamping any spikes as it turns off. But we've also got 100 Nano across the motor itself which will also help.

And then we've got Uh two more 100 Nano which are going from either terminal onto the case. I've seen this a lot before. It's all to do with RF suppression of noise from the sparking brushes. probably cuz it's under quite a high load because it's really throwing a lot of weight around the circuitry.

The chip is powered via a shot key diode. um for polarity protection, there is a 220 Microfarad 220 Microfarad 10vt capacitor here and there is a decoupling capacitor probably 100. nanard it's in circuit so I couldn't really test it. Also, in parallel that capacitor, so I'd have to take it out to test it.

There's a little button which is actually the Uh coupled um external push button through the sort of sliding met plastic ring onto a little uh plunger that pushes metal contacts together. very typical as found in toys. And then here's the odity. So it drives the mosfet an A3400.

Actually, the mosfet was marked aola, aola, aola Olay So there's the moset and uh, it switching the motor, but noting that on the source of the mosfet, this N Channel mosfet. we've got the PTC Thermister and its numbering. Its numbering is Uh, A135 1V A 135 1 V I Wonder if that's a 1 amp, but it's a 135 volt rated one? Not sure. Tricky.

Okay, the markings. these all quite odd and it didn't immediately tally up with data sheets. And there's the fixed 68 Ohm resistor which limits the sort of inrush current from the start. Um, so it's all geared up to interference suppression and also the possibility of that just motor stalling and causing problems and it would just cut the power off to avoid overheating.

Um, very odd. But there we have it. That is. what's in that lured Bumble Boy Toe Bumble Boy toy Bumble Ball toy no Bumble Boys, that's embarrassing.

What is a Bumble Boy? I'm not no I don't want to know. Actually, it's probably a term used in the Catholic church, but there we have it. Uh, it's an interesting toy. The most interesting thing is all the suppression, which would be completely missing in any Chinese import product.

Any sort of gray import that didn't have to comply with UK noise regulations H They probably wouldn't have this overcurrent thing I They'd just be basically saying if it goes up in smoke, the chout is going to have to learn to expect explosions. But there we have it. The Bumble boy from BM H stores quite interesting little toy inside.