 Hello everybody I'm welcome back to my channel. We're just going to do a little video now about this hi-fi audio amplifier And one of the reasons why I'm bringing your attention to it is because a lot of people are going to get fooled for things like this Hopefully none of my viewers will be fooled on something like this, but a lot of people will be They're going to look at things like this. There's number. There's this car 180 watt times to power digital Amplifier hi-fi MIDI stereo audio amp USB FM Mike home I don't know what the FM part is and I presume Well, we'll go through that in a second. There's got a whole bunch of pictures some dimensions there and a Lovely lovely LED that glows in the background Yeah, some some pictures a few notes on this picture says BTL, which is a bridge-tied load Which means this a If you imagine two mono amplifiers being pulled being put side-by-side The two negatives being used as a ground and then the two positives being used in a push-pull configuration on the speaker That's an example of a BTL. It's not the only example, but that's just an example okay, so Yes, there's not much more as I go on but there are some interesting things about it One of the things here is like it says it's 180 watts times two now this whole what thing and numbers with watts can be Quite further people who don't know can be quite a They look at that and wow 180 watts of times two is that the two speakers 180 watts each on this amplifier That's great But this isn't really what this means and I don't think that this is this is just I mean this is complete Bs and what we're gonna do is we're gonna look down this for a second you get to look here We're gonna look here, and I'm gonna see where it says item specifics, and it says the power is 20 watts plus 20 watts Okay, so that's difference to start off with It has a distortion rate of naught point naught one percent Signal to noise ratio of 90 dB feature high fidelity high fire And then we're gonna look across here We're gonna look at the input voltage here because this says quite a lot the input voltage here is 12 volts We got load impedance between 4 and 16 ohms And we got our frequency of 20 Hertz 20 kilohertz standard amplifier, and then we've got a max power and The max power on these can be that and if At any Moment and depending what you consider a moment, but you can be the shortest period of time There could be a time where the amplifier by that moment to that moment only Could reach a lot higher maximum output It's very easy to see how they can play with these numbers But what they do is to be naughty is trickery is they just try to advertise it like that Knowing that if you go down here or don't go down here because you might just look at the top part You'll see a 20 watt put 21, and it doesn't tell you whether it's a PMPO or PMOP Them two can be exchanged or RMS which is what would normally use So what we're gonna do now is because I've actually bought this We're gonna take a peek at it, and we're gonna take it apart We're gonna look inside and we're gonna see exactly what this thing is all about this device is not going to be able to output any more Power than what it can draw in So we can look at this and say it's 12 volts 12 volts 2 amps 12 volts 2 amps to 5 amps So it's possible it runs at 2 amps and it can draw up to 5 amps So let's just look at it as the 2 amp first for some easy maths to work out what this can be putting out just by you know Just think it off the top of their head. So 12 volts times 2 for 2 amps. That's 24 watts That's 24 which would have which equals 24 watts So there's absolutely no way That we're gonna be talking 400 watts, especially if we're talking 400 what RMS the normal sort of thing when people think about wattage They don't think about all these other non-really defined institutionalized or standardized PMPOs or PMOPs or anything like that. They think RMS And if we looked at it at its best We can see 12 times 5 there Which quick work is at is like 60 So the maximum power that can be drawn into this system is 60 watts And that's probably you know Well, whether that's true or not, we don't know what we're gonna do now Then it's we're in the loop all right, and we're gonna come into this box I'm gonna take it straight away. I think that that's the only honest part about this really is open from here but Let's pull it open. No, I did think I was gonna do a bit of unboxing this, but I actually felt when it came to the post It was my medication But it's not so let's just pull this out Okay, I'm struggling with the box Let's give it a that And so here we have it. It's a little tiny thing. It's not much bigger No bigger fits in the palm of my hand Interesting thing is about this Bridgestide load So it'd be interesting to see what's going on inside here That doesn't get a pretend equalizer thing going on there We got our audio input. I Don't know about the radio side of things. We've got treble. We've got bass Bit of a rough feeling of volume control And a nice pushy on and off switch. I do like those that Looks like it's got something tied to it I wonder if that's something to do with the heatsink, but anyway, let's Bust into this thing. Alrighty, how? Looking in there. So it's I suppose a bit of a Heat shrink a heat shield a heatsink Okay, so she wrote so there's a bit of a Thermal coupling paste there That's nice. Yep little time with thermal coupling paste. That's all And this is what we got inside then The best way again about doing this break it there we go That's a little what we got going on down here But onto one time see if we can see anything I'm looking through the camera myself If I just touch this Nope three times in. Oh, we got a partner by Tyvan great stuff. It's made in Tyvan I won't get this thing to stay in focus We've got a TDA 70 57 AQ all right Nice big spludger solder on the side of that It's always nice And just looking at the inside of this here. H y 207 8c we've got all Carbon resistors in there. Oh, we've got a piece of water tie in these Pots together No, I'm not even gonna suggest that I can break down the circuit for you but I pretty much guarantee this is the the amplifier side of things and It is probably the the bridge amplifier But I'm gonna say just off the top and I have there's no way this thing is gonna be doing 400 watts Or even the 20 watts. I wouldn't have thought so Just looking at the side of it the size of it and the size of the heatsink on there That's not it's not really made for dissipating that amount of power Even going on to this little flimsy case again Yeah, I mean 20 watts. You're gonna get quite a bit of warmth from that Okay, right. Well, what we're gonna do then is we're gonna look up what that is So let's have a little look down All right, I'll straight away 2.2 times 8 watt stereo Bridge-tied load BTR audio output amplifier with DC volume control We're gonna supply voltage What we got here for our features DC volume control few external components new to mode thermal protection in short circuit proof No switch on and switch off clicks good overall stability low power consumption low HF radiation ESD projected protected on all pins Alright, that's good. The ESD is the static So voltage Supplies between 4.5 and 18 volts. That's great. They say 12 volt a lot people at 12 volt adapters I would be for your route is whatever you still use it Voltage gain 40 DB 39 41 so around about 40 DB Voltage gain control Yeah, we don't need to be bothered about too much total harmonic distortion Power out equals 0.5 watts typical 0.3 And what did we see on that advert? Did it say? That the power output distortion was just to recap here. Oh, that's right. The distortion rate 0.01% so that's a cracker for how you doing That's the insolid block diagram There's our pinout. I'm not gonna bother following the pinout through anything like this All I wanted to sort of show was this thing isn't gonna do what it was it says it's gonna do at least what the advert Said it's gonna do So I just want to look and see what sort of current we can put through this thing On the total power dissipation on this and that's total That's with the thermos up the case less than 60 C is 22.5 watts So we're not anywhere near I don't know how you do any sort of sums. I don't suppose unless you know Yeah, they are power dissipation assume pp equals 12 volts right says the voltage equals 12 volts and the load equals 16 ohms which is the Least current consuming load 16 ohms a maximum sine wave dissipation is two times 1.8 watts equaling 3.6 watts, so there's no way on this earth That this is gonna be able to deal with 400 watts And I don't think it's well. It's not going to do 20 watts per channel either So looks a times right thd equals 10 percent the resistive load of its a times at 5.3 watts That's 10 percent thd Total harmonic distortion 0.5 was ZAA 0.3 Maximum 1% and that's at 0.5 watts like All right, that's not that's not running That's not doing like you know what I've shown in some videos you run it until it clips And then you back it off So it's not clipping anymore on the sine wave and you can do your calculations on there on what your wattage is But you can't have it clipping you can't have any Distortion as such certainly not clipping Okay, well, I don't think we need to go through this anymore We don't need to get through any of this though even says here look two times eight watts stereo BTL audio output amplifier with DC volume control So even written in here look We got Is it so yeah, we've got 12 watts three amps. So that's basically 36 watts Yep And you're not gonna get 36 watts out of it you put 36 watts into it You're gonna lose some because the circuit all this wants some energy for itself to use it And then you're gonna have temperature when you're gonna be losing power as temperature rises on the chip Yeah, we go yeah RMS look 20 watts plus 20 watts There you go be online manufactured like difference between the one down the one up top there I don't want the top is you on auxiliary in on the top. I Don't know it's like on the back That's the a key a K270 and this is the a K170 There you go guys quick little thing on that just to you know, don't get blind side I don't get fooled by these things when they put out that it's all this watts It's most certainly not especially if the components inside are just nowhere near cable mark to do that job All right. Cheers for watching and I'll catch in the next one guys. Bye. Bye