 hello everybody and welcome back to my channel now you'll have to forgive me for a sneeze and I've been doing some cleaning with some disinfectant spray stuff in the my fridge freezer I think it's affected my nose quite a lot so please forgive that no this is the start of a new little project so we're going to be building an audio amplifier a rather good one as well something that you can use at home something that would probably fall into the bracket of high-five quality something I'm very happy with I built two of these boards a left channel a right channel probably up to maybe even longer years ago maybe three years ago and they still work it's the work fantastic that's what I've had on the background while I've been doing my housework and I love the sound of it and I really want to share this with you guys because if you are into building kits and things like that this is just basically a kit difference is you've got to go and find your own components but I'm going to give you the bill of materials and so that's going to make it easy for you to be able to get bits and pieces to get it but first of all I just want to tell you about this particular circuit and it's a come over to the screen with me it's from Elliott Sound Products it's a 66 100 watt high-five power amplifier so I'm not going to go through all of this with you but I'm going to just give you we're going to go through it all as the circuit is built but we're going to give you the breakdown of what's here so this is a project on sound-au.com Australian website Australian chap excellent and the project is 3a now as we go down the reason why I'm building this is one because if you wish you can buy the boards you can buy the boards from ESP Elliott Sound Products which will make your life a lot easier I'm going to be building mine on to Perth board I've done it twice already I'm going to do it like that because well I've got the boards and I enjoy doing the soldering I like making all my tracks tracers up with the component leads and soldering that in there it's it's done me good it's done really well so far so I'm going to carry on doing like that that's for me now like I say it sells the boards you can mount your transistors vertically or horizontally it depends how you wish to on those boards or you can play along at home we can go for the Perth board approach he recommends some specific transistors and they're the ones I've gone ahead with this time the last time I didn't I bought transistors which are just bought off eBay and they've done adequately they've done very well indeed a far outweigh my expectations I hoped for them to be as good and they have been as good so I'm really really impressed and these are what you can get if you don't want to buy that's like more expensive from on semi through you know I bought mine from farnow.com so as you can see is there's the transistor list and I got some borns 25 turn 2k trimmer you want a 25 turn if you can get it because that's going to be more resolution to tweaking in that quiescent current all important quiescent current so this is what I got mine from you don't have to like I said on this page you're going to see where the alternatives are and even if I just show you here in this section here you've got the alternatives the ones I'm using are these ones here or you can actually use these cheaper ones and JW 3280 ones and JW 1302's that's exactly what I've used on the last two boards and I'm thrilled with it but I'm going to make another two boards with the recommended the top ones chips of this specifically made by on semi for audio now one thing I do love about this circuit is looking at this is that there's a lot of literature there's not too much it's all very very relevant as a lot of literature but the nice thing about it is it goes through there different transistors and what you can use even if you want to use tip 35 tip 36 for your output transistors there may not be as high a quality as the other ones and they may not have as much power dissipation capacity and they don't as these I mean these are 200 volts and these are 350 volts was only using this so I've been using these before and they're ideal this one be their bd 140 is and 139 for the driver trans transistors I do that they work they're great their audio transistors and they work and they're great it doesn't matter about your capacitors I'm a child and you're not a ferret you don't have to use the fine goldmuse stuff and it you can but you can and I would say hey you can find them cheap enough use them you know use them or you can use the other ones because at the start I did and all I did with my boards was once I decided yeah yeah I want to stick in the better quality capacitors and such not that it seemed like it made much difference but I'm sure it did otherwise where's the point in the difference on the capacitors I just use cheap ones cheap ones you can get them in a bundle for like a couple of dollars of eBay for you know probably 50 hundred nanofarad capacitors and you want to make sure you get like 50 50 volts or a little bit higher if you want to but a 50 volts minimum and it will give you the difference in between driving into four ohms eight ohms different voltages I'd recommend getting me transform with a 24 zero 24 output because I'll give you 35 volts per rail on DC the board we're gonna know the board a little bit now here's the circuit this circuit is very good very simple at the same time and because it's like that it makes it easy enough for a new point me to be able to put together and build get it right you know because I did and I was so thrilled with myself and that's why I had the nerve to build the second board without thinking I'm gonna you know it's gonna be no good I'm gonna break it we'll go to the circuit in the next one when I tell you now it's got a long-tail pair differential pair in there which cuts off a lot of the unwanted frequencies which cleans up the sound of circuit right from the get-go that's one reason why it's brilliant and you can lay it out exactly the way you see it meaning that you don't need to reshuffle this in shape or anything like that because that's what I did I laid it out as I see it and that's how I got onto my boards in the first place now they're underneath the coffee table to the left of me right underneath and that's what I use as my high-five system it's all in the name of caps can't get under there particularly and it works great it works great so let me get out the nice thing about this is yeah you it tells you about everything to do with the board what what what it's doing and that's one of the reasons why I really do like it it's because it goes through with your bit by bit what does what and why it does it as you can understand and even down to the little green LED that is on the circuit it's not there for sure even though it does look pretty cool it's a little green LED here little green LED there it's not for sure those particular LEDs are the ones that you want and not the very bright ones they give a certain voltage drop across it 1.92 volts and that's what you need in order for it to do its job in in the circuit and that'll be I'll explain that more when we actually go into there the circuit start doing the build you've got a whole bunch of information about construction it tells you what resistors to use now it does say here you can use a quarter or half watt metal film for the lowest noise I've used quarter watt because the standard ones are the ones you can get cheap you can buy a whole packet of those 56 different values 1800 capacitors and resistors sorry for quite a cheap price round about sort of 15 bucks some like that I would suggest that you get maybe if you can I mean I've used standard cheap 2k pots 25 turns but these ones are born so a bit more expensive but the reason why I've gone for these this time round is because I got the better chips I have over the last couple of few years had to just slightly tweak the the the wiper on the other ones on the other channels but that could be because maybe one day I set it up when it was really hot day and so it seemed like it was a bit more and the other time I did it was really cold don't know but this time round I've just gone for these just because I don't know but what the hell not I had to make up a certain amount of money to get free shipping right so we can look at here as well and we can look at the the quick parameters and the measurements base specifications gain 27 db inputs impedance 24k input sensitivity 1.22 volts for 100 watts into 8 ohms frequent series response 10 Hertz to 30 kilohertz minus 1 db typical distortion THD total harmonic distortion in 0.04 typical on what 80 watts power supplies 42 volts into 8 ohms 90 watts power 35 volts into 8 ohm 60 watts power 35 volts plie 4 ohm load 100 watts now I use 35 volts into a 6 ohm load so I'll get somewhere between 1600 home and noise minus and 3 db v and weighted and the DC offset of less than 100 millivolts so that's all good stuff it's all good stuff is something you can build at home now we go from there we talked about the recommended power supplies and search like I said I'd go with the 24 24 and have yourself 35 volt routes because it's not really worth the extra stress you put on the chips for that little bit of extra one and a half db that you might get in game so we go through a whole bunch of power enough instruction which is very good and this is why I really do like this so apart from it works really well I don't know that at the start but it's got a lot of literature and it's got a lot of guidance all the way through it and that is one of the things that you don't really find with a lot of circuits that are just out there published on paper there are certain websites out there don't go in wrong ESP Elliot sound products is one of them talking electronics is one of them they're the ones I mainly use when I'm looking for things I need an explanation of how the circuit works of course I'll watch some YouTube channels as well John audio tech and blue glow electronics because they give great explanations and I'm sure there's lots more out there as well but you know you've only got a certain amount of time in the day to be doing this sort of stuff so I limit myself so yeah so there's a whole bunch of information the power and up which I really do like and then we have our power supply so even it shows you your power supply there and your capacity your capacity is very basic very easy it's non-regulated you don't want to try regulating this thing I would suggest myself personally even though he says here that you can go for 300 VA transformer I would suggest two different transformers at 160 VA each and the reason for that is because you might have the right channel doing a bit more work on some base or something the left channel and you don't want that you don't want them competing on the same transformer it is only my preference the same transformer for current so if you don't want each independently choice more like mono blocks then that's my preference but that's why that's what I do begin so yeah so you even got down to the information on here now I've got 15 millifarad online and this time around when I build it I'm going to actually split that between more capacitors rather than have three capacitors giving me two capacitors per side that would mean that you've got four capacitors I've got one 10 millifarad and one 4.7 so about 15 millifarad per site because you've got a swing of negative 35 volts positive 35 volts was that 36 negative 36 positive 36 and so you're going to have a negative 15 millifarad and a positive 15 millifarad and I've broken mine down into two capacitors for that but rather than we do that this time around I'm actually going to build that across five different capacitors aside because when you parallel your capacity a lower equivalent resistance which is great I mean who doesn't want that right so the air there we are this is the circuit we're going to be going for over the next couple of videos probably three videos gonna couple for the build talking about the circuit a little bit more so some stuff I can explain in there and I want to be able to read off some of this to you as guys as well and it all takes time and of course it's going to be the building part of it as well and then afterwards we're going to be testing it and see how it works and I've still got to wait for transformers to come in and the extra capacitors because like I say I'm going to be using five three thousand three hundred millifarads per side that's ten capacitors per board if I need some slightly bigger boards and waiting for those capacitors to come in they've been ordered the transformers haven't but they're next they've delivery that's not a big problem it's just the cash for that so yes I'm very excited here is the bill of materials if you want it to be a screenshot that if you were going to play along at home this is where you get to see all of the resistors that you need right and we've even got the wattage the ones you're going to need there the rest of them can be halves all of the capacitors that you're going to need yeah that can just be classed as C8, C9, C10, C11 don't worry about that and then you've got your ED1 which is the only diogen in the green LED five millimeter regular brightness you don't want it extra bright on this and you've got fuses you need fuses per side this is per side as well this isn't for two channels is just one channel and then you got your your transistors down this way I've put in the transistors that I've got but you can look at the other ones on and go for the cheaper ones like I say I've been using the cheaper ones and they've been fine they've been great why did the upgrades in the next one as well I don't know why not I had 50 quid bed and hole in my pocket and I really wanted to build another couple of these channels because I think they're great I would suggest as well getting from the decent supplier as well your BC546's if you're going to get them or you might find them on eBay and if you find the ones that are marked up nicely like these ones you can see they've got a gray covering on them these do work really well the decent the decent ones but yeah that's it and I'd say I've at it because it's a really good amplifier and I can guarantee you you know unless you missed the audio file and want to try and pick holes in it you hardly gonna find a better one out there to build and there might be some but there might be a bit more complex to you know making in doctors and stuff in there which are all very good but it could be a bit more complexity to it like that this is simple that's all I like because you know I'm not such a great bright spark so I like simple I like easy to lay out something I can lay out on a board if I want to nice and easy and I can do it as I see it or with another great preference is if you wanted to you could just go directly to ESP Elliott sound products and buy the boards directly from him I believe they're about 25 pounds what that could relate to in Australian dollars or American dollars I'm not quite sure but it's your choice I'm gonna be doing under here if you got this far thanks very much for watching and I can't wait to see you in the next one these videos are gonna come a little bit rapid hopefully get it all done with less than two weeks so they're gonna come a little bit rapid as they might be up a little bits of details I want to stick in between times I think I may have forgotten catching the next one guys take care everybody