 hello everybody and welcome back to my video log my channel and I'd just like to give you a bit of an update on what's been going on with this so here we can see one of these ESP 60 watts audio amplifier boards power output and they're great don't get me wrong they're great so you can build at home you know sort of very come parts they're easy this one's got a whole bunch of transistors missing and I'll tell you why and I'll show you the bottom of my lap before I pull this out of it you can actually see we are a little bit of an issue now this is not the board this is not you know you can leave these boards on and just leave them on they're fine honestly are the amount of times I've gotten up in the morning to see the little green lights on they're fine the problem and I've done this twice now this time I've blown a whole bunch of transistors and I'm down to this one here on the input on this is a long tail pair and I'm down to this one if this one hasn't gone then I'm pretty sure these two will be okay but if this one's gone I might even be down here but I don't think this one would have gone but the main transistors went the driving transistors went and the bias bias transistor went and can't remember what the little transistor is that sits in front of here but that went as well everything else seems to be okay apart from this resistor and now instead of it being 0.27 ohms it's 70 ohms so that's no good and you can see that the board's taken a bit of a rough and tumble the these are all not dead so far so I'm hoping but they're cheap they're cheap these are the things I was getting off the internet they're not expensive they are the ones that you can get I think there's five two or three pounds they're five pairs I should say so you get the left and right channel PMP and MPM cheapest chips and these little 140s and 139s these are cheapest chips as well these BC 5 4 6s you know they're reasonably cheap I didn't buy the cheapest I could find and put these Phillips ones I think the Phillips but again there was all the place like that but it doesn't matter and I tell you what you know I've come to this conclusion as well I've been reading some books and amplifiers and it's especially the oldest of tubes and that one he was put to me in a book is this is back in the day when they were doing high fidelity you know reproduce it as it was produced type stuff high fidelity they're using parts and stuff that you throw out today you throw them out so they're not good you replace them with something a bit better and they don't have to be the best parts to get a good sound and this is not using the best parts and the sound on these is great and they're so easy to build as well okay they're a bit time consuming but hey you know that's part of the fun of this it though isn't it and getting it right and have a nice little amplifier speak now why did it blow well I tell you why it blew because it's me it's me a little bit and it's this a little bit when I say it's me and it's this I mean this is like class a so if you imagine this is your water pipes it means that the taps are open fully all the time right so if I make a noise here with a loose cable it amplifies that sort of chronic and then it outputs that and it puts it into here and you know it just does just can't handle it and that's what happened and there's another thing I found about this as well I'll go over that in a session and I did that the first time around you think I'd learn you think I learn this thing's running at it's 353 no yeah 3535 so 353.5 because it's 250 volts coming in times or 1.414 and that's what you get so that's what this is running at on these on these plates on these so yeah it's all systems go and when got them should have this over here and when when it makes that noise coming through here it amplifies it up kicks it out puts it into this and this amplifier I can't take it like that and it pops it up but the worst part of this isn't this the worst part of this is something that I'm glad that I took the precaution of and the precaution was to get these speaker protectors because the first time I did this it actually killed one of the cones to my speakers and I was gutted because the speakers like nearly 300 pounds and it's when you kill a cone you've got to try and find one you're trying to split the speaker up it's a whole bunch of hassle you don't want so I invested in some of these I'm showing a circuit for it I invested in this on the board and I put the board up now quickly this is a variation of the board and the only difference here is where it says Powell you'll see a black cylinder type thing that's a that's a resettled fuse I don't have that on mine I have little little 5 amp fuses on mine and my 5 amp fuse blue which is brilliant because it didn't play my speaker but that is the this is pretty much exactly the same as what that circuit is and there's the fuse there mine's a glass 5 amp on mine and on that particular border just showing you he doesn't have any of the ones that's a Brian Powell audio that's the chapel I bought mine off a couple of them one free speaker obviously and I just had to change the fuse I was so happy when I realized it blown the fuse because that meant that that could have killed my speaker cone and it didn't very very happy I submit also to you you know because I'm gonna do this and then I'm gonna see about if that isn't burnt out there I'm good for replacing the rest of it I'll replace this the caps are good I've already tested them I got one of these in-circuit testers and it works out okay everything else seems to be normal these 10 ohm here is normal I don't see why anything I should be affected I think even the LED might still be good but I'll find that out as well another thing about this Matsui type thing is this is what I didn't realize and it's happened to me a couple of times one where you'd be listening the way to it and if you switch it off and then try switching it back on again it won't work it doesn't come up you gotta leave it for an hour for everything to cool down and then you switch it back on again and you'll hear the relay click over now but I've had this happen I was doing washing up the other day and I was just listening to squeeze call for cats and partway through it it just stopped I could very faintly hear out must be because the music but it stopped it stopped you know I'm fine and for some reason it just like switched itself on and I couldn't get it to come back on again this is why it's on the bench this is why I've had it I've just been running signals through its sweeps and all sorts up and down the audio range just to try and get it to do it again and I haven't managed to actually get it to switch off while I've been running the sweeps but I have noticed that if I do have it going I do leave it for 20 minutes or something and then I switch off the circuit and switch it back on again that relay doesn't go that doesn't work so anybody that's thinking about me again that just you know bear that in mind honestly in the description as well because somebody might just be interested in that then I've had the same sort of issue I thought it was an issue and got irritated with that but I saw I'm not quite sure what this video is about this video is about just destroying this but not in such a way that it can't be fixed again it will be fixed I'll fix it up and that's a great thing about you know building one of these is that you get the spare ones and it's so easy just to rebuild it again you've got to work in speaker channel amplifier channel again and of course the speaker protection board that was a very worthwhile investment I might actually try building one of these because I got some triacs because I remember when my my 898D the SMD rework station popped its triac and I had to buy a bunch instead of just buying one I think I bought ten in a strip it's a couple of quid in China ten and that one that I put in there has been in there since now I don't use the solder part of it because I didn't find it kept its temperature as well but I do use the hot air gun and so it's still up there but yeah so I've got one of these and I know I've got some of these and I got some VC549 so I might end up just building one of these myself and do some tests on it you know get it to chuck some voltages through that shouldn't be going through it some current through and see if I can pop some of these fuses out okay that's it for this guys thanks for watching if you got this far I hope some of this may have been helpful to you or not and I'll catch in the next one very soon bye for now