 hello everyone so well I just thought I'd try this on this transformer this has got a it's a 30 volt transformer so when we do our 30 volts times 1.414 we get 42 volts and we got to sort of lose one and a half volts of that because of the pre-directifier and as you can see over there I'm sure you can see I got to temperature monitoring the temperature on this side is the bottom one temperature one and on this side sorry let me just show that to you a bit better this side is the bottom temperature temperature one it's pretty much all the way down halfway so it's not quite on the back of the transistors because I'm using the little gullies that's all I built into this to push the wire down and then the top temperature there 34.7 is this one here and what we're going to do is if I can just back that off there is I'm going to power this on now and you can be ready to see those temperatures going up I wonder if I can just bring this in a little bit better even if it's on its side does that make it any better all right it's all right when you're doing it yourself just looking but soon just start thinking you've got to get it somebody else to see it all gets a bit different doesn't it all right well I mean that's that's good as good as we're gonna have it so what I'm gonna do now is we're just gonna go into the waveforms over here okay so we've got waveforms open and as you can see on here just move this across this is where we got to this is what I managed to pull out of it it's 27.771 volts ACRMS I'm gonna do it again now for you and we can see for yourself how this goes up I'm not gonna get all these onto I'm just gonna drop the voltage on that I'm gonna pop that on there and we're just gonna look just for the second just to see if it starts going up all and it's Todd's just while I'm just why that's plugged in I'm not doing anything else because it's that quiescent current thing you see what I said before where because it was gonna be quite high it almost seemed like it was just gonna get more warmer and warmer and warmer do we see it starting to go up even though there's no input actually going into it the temperature is getting higher but all right let's just we'll just have to get past that for now I mean that's gonna happen anyway what we just don't want it to do is just run away completely I don't think it's gonna I think it's probably gonna get up into the 40 I've seen it up there anyway and I'm just sharing this for you because I've been playing with the thing so let's just back that off a little bit and I'm gonna start putting some power into this I'm just trying to figure out a way that I can keep that on the screen yeah I can shuff the over onto there that's all right so we know we've got 42 volts coming in per side or you know around about 42 volts coming in the side of this MX 50 and I am now going to start running so let's go and I'm gonna turn the output on okay so our outputs at the moment there's our fundamental going in there that's one kilohertz here's our two kilohertz three four five six and so on all the up to 20 kilohertz could probably put this on the 30 maybe I just top that in there 30 just get a little bit of extra there so we're going from zero kilohertz as well I've got 10 volts per division I could pull that down a little bit 10 volts per division and I'm just gonna start going up the voltage now until we get our bit of clipping maybe what I'll do is I'll just make it easy for us all to see I'm gonna 4500 microseconds and start just taking that up there we go clipping top and bottom and I'm gonna just drop that off until I see that's no longer clipping it stops clipping at the top before it stops clipping at the bottom about there we'll do it let me just chuck the sample up okay so about there that looks like it's still gonna be clip on it so I'm just gonna back that off one more two more three more just gonna back it off till I see so that you can see it going up clipping clipping back that down so it's just not redoing anything that's it that'll do it I think we should be quite happy there I'm gonna stop that there stop the outputs we don't have to and you can see the temperature has gone up there but we should have expected that anyway because that's a lot of signal to be pulling through there so why that's just doing that I'll leave you up on the screen just in the corner there keeping on it we're gonna do a quick bit of math on this so we've got 27.869 and so we're gonna go 27.869 times 27.869 that equals 776.68 we divide that by the 8 ohms so we got ourselves 97 watts it's pretty good going 97 watts it's remember this well it says it's plus minus 45 on this one I think that's for the full hundred watts in its way times that certainly delivers and we have a look down at the FFT let's just make that all a bit bigger we can see that anything coming out of this which you can get some harmonics anyway this is so look that's 78 minus 78 DB 78 DB down or if you want to say it this is on three kilohertz that's 80 DB down 85 DB down let's have a look for the next highest peak this one here which is 97 DB down that's a 10 kilohertz this one's 80 DB down and this one over here is minus 77 77 DB down that's 21 kilohertz so nothing really to see there we can still see on that we weren't clipping we weren't clipping at all which is nice now what we're going to do now is we're going to switch this over to a square wave and we're going to see what we do with the square wave we're going to keep it on that temperature of course one thing you will notice about a square wave in the FFT is because a square wave is made up of loads of sinusoidal waves you're going to see it all laid out in the FFT well you'll see what I mean just as we start doing actually so let's just put this up to something we go like that for now we're going to use square wave because with that we're going to be able to see where we roll off at high frequencies and low frequencies and I show you what I mean which I'm sure you'd know this anyway let's just turn that down so I don't need that up so high for this one volt okay so looking at the square wave we're going to turn our scope on so let that get running ten volts per division that's probably a bit much now so I'll just drop that down to five volts per division and turn this output on I see what we got all right you see what I mean on the FFT the three hertz they all come through they're all odd as well you'll notice that's how it works with these square waves so now we're at one kilohertz there and that doesn't look particularly bad I'm going to shift that down and make this look a bit bigger and you can see this little bit here that's a little bit of trouble roll off but very very minute very very minute so let's just start we'll go up first so it's just got frequency and we're going to go up to ten kilohertz just adjust this out we can have a look at that that's still not bad not bad square wave let's just down to 50 that's not bad and now we're going to go up to 20 kilohertz and again we're keeping a square wave there which isn't too bad at all let's just drop that down again that's not too bad a little tiny bit around enough there a little tiny bit around enough there but nothing nothing really too too upset about 30 40 it's got a 50 and as you can see it starts changing now and you can also see that the temperature is going up and up and up all right so that's about 50 kilohertz low so let's just take that all the way down now down to five kilohertz and then we're going to go down lower in the frequency we get that extra didn't want to get the full hundred but there you go we're squaring off there it's not too bad still that's a lot a bit low there a bit high there that's the treble rolling off slightly so let's just go down to one kilohertz just put that back to our five and now we're going to go to 100 now we will start seeing a slightly different story I 100 Hertz he's just did this little bit a lot of the trouble but as this starts declining it's nothing it's nothing but this is the base and as this goes up this shows a little bit of roll off on the base but it's still nothing really that's at 200 Hertz sorry that's a 100 Hertz let's go down to 50 just go into a little bit more I'm milliseconds again this is the base rolling off a bit now it's still not too bad at all I mean considering what it is let's go down to 20 Hertz we still see over there that the frequency that the temperature is still rising rising rising that's getting very very warm and we're in at one volt per peak peak okay but still that doesn't seem to be too bad at all too bad at all but I'm gonna just drop this off now that's 20 Hertz that's 10 Hertz which of course was never gonna be one was never gonna be sure I just did that that's a lot of roll off isn't it okay so that's just playing around with that on the square waves just to see what we're gonna get what we were gonna get and I just think it was interesting to have a little look at it and have a look at how that temperature goes up I mean that does get sorely warm so I've got a funny feeling that's gonna need a bigger heat sink not even tried it at forums but a bigger heat sink most definitely and I'm glad that I got that on a bigger heat sink as well let's just keep that I mean nothing's melting as far as I can tell but that is definitely gets warm so that should be something to look out for if you're using the heat sink of this sort of size let's have a look what sort of size are we this is six inches by two and a half inches by one inch it's not it's not really adequate for the amount of power that that can be taken but then I'm running it generally at a lower voltage anyway I don't need 100 watts of power or 90 whatever it was we were getting out of it let's go back to the drawing board 97 I don't need that in this room in this in this building I don't need that at all I'm quite happy playing that says I have been do you know it does sound nice I'm not gonna say it doesn't sound nice because it does sound nice but when I went from my ESP 3a amp to that I felt I was not lacking I was just and that could just be because I've been playing around with these op amps and you know I like her sort of like clear bright sound but I also like my basses to roll that was one one thing I didn't notice I mean don't get me wrong this does sound nice but when I play a particular track and this is by the by the Beach Boys good vibrations there's a part in it towards the end but it's got quite a bit of bass and there's a bit in there that rolls out at you at least it does on the ESP so it rolls out at you a little bit you hear the thing in your belly with it but it doesn't really seem to do it on this one but that could be just because you know I don't know there's lots of subjectivity with these things and it's a tough one to go on but there we go I just thought I'd check a square way through it keeping on that temperature I've actually taken the power off it now and done the power over there and play around with some of this some of this stuff that I've had and I have been playing around with it but I've just been getting used to using this but I do quite like using this just for the scope side of things and using that over there as my waveform generator and I've also been playing with this but the problem is with this is I can record the screens on this you see it's got a recording system built in so you can just set it to record record the screens but every time when I power off keep forgetting to record and it messes up your video file so when I take it off I can't actually play it back unrecognized format how annoying is that and I do it every single time otherwise would have had that this on this today I just got so frustrated with it I thought I'd switch over to the to the trustee waveforms on the laptop because I know that's running in the background and I won't just switch it all off without stopping videos and naming them and saving them and doing anyway how you find it interesting nice to see what we get for a 42 volts and I'll catch you in the next one guys thanks for watching please say add that to your nudge