 This video is to try and clear up and hopefully get one step closer to resolving what the issue is with these particular boards. Now this here is a genuine Hyland board. This is the first one I bought. I did something wrong on it. I blew out the 24 volt regulator but I managed to knack of the tracks on that. This is the D882 here. I think that's what happened as I knackered one of these up. I don't know why it's got to this where it's been taken off but there's something I need to show you. I said we're going to start off by just getting rid of that for a minute and I'm just going to show you now this is what I'm going to be using for doing these check is not this because it's got a big bust bit on there. That's going to be seen there so that's no good at all. This one that they all have the same failing because it's got these two pots in here which will make a difference when I'm measuring these pots and bits and pick these resistors and so we can use this one and we're going to try and revive this. This has got on here just same as on this other working one. It has marked up amps. I don't know how long you can see that from there. Let's just see. Marked up amps. And yeah so we've got a little bit of a reference here to what's going on but because we know some of the parts here we can't measure any of that but what we can also see as well is on the 5 volts like that but on these 5 volts I have noticed that you can actually see where it says 5 volts like here. If you can see this one here you can actually see where it says 5 volts so for those who sometimes make a bit of a pickle about which one see the 5v on there well it should it should say 5v1 because it's 5.1 volt rather than have the extra character you just do 5v1 and we know it's 5.1 volt. Right so you can see that on there and you can also see it on these ones as well. These ones even though it's not that easy to see them you know the 4148s do come in a strip. I knew that to remove showing up the 5 volts. Yeah but now there's something I wanted to because there's been quite a lot of response to this video and that's great that is great but a few of the things I've heard is talking about VA which is voltage amps and how much you should use and within this circuit so okay let's look at it like this this circuit is 0 to 30 volts or not 31 volts really but you know on a specs it's not 30 volts 2 milliamps to 3 amps so let's say we just take the 30 and the 3 and we times now we've got 90 so that's 90 watts of power but this is 90 watts of power in the ideal world and it doesn't work like that. Every single thing that we're doing there's going to be a loss every component everything is going to create a loss there's nothing you you got voltage current going through this transistor there's a heat sink here for a reason and that's because it's going to generate heat this is all lost energy and so if you were to get yourself let's say 90 VA for 90 watts you're going to find yourself when you're starting to actually use that power because of the losses you're not actually going to get your 90 VA so you want to go up a little a little bit higher some people say to use less VA well if that's the case you're never going to get your power you you're not going to get anything for nothing this is one of the ways that all this works is there's no free lunch here if you're going to be using power through a circuit well this circuit needs power to run these components all require a little bit of juice just for themselves so if you were to be really strict 90 watts let's say just 90 watts 90 VA just call it like that for the argument sake and then you were trying to get 90 watts out of it you're asking for you know one to one you you you want the ideal thing and it's not going to work like that so what you want to do then is you want to make sure because you don't want to go in any higher than 24 volts I'm going to show you something now that might start here is this is my on AC and we're going to measure now I've got them two joined here in the middle because this is two 12 volt outputs and so I've joined the two middle ones which would go into this here this middle pot here on here which doesn't actually connect to anything it's just there to keep it out away if you've got just one straight 24 volt output you wouldn't have that and that's fine and you just connect these either way it doesn't really matter into here because it's AC so it's alternating so what we should expect to see then let's say we're supposed to be between 220 and 240 volts here so let's just say 230 volts and that's what I've got this set onto here 230 volts this is my variable AC supply so I can drop it down a bit or take it up a little bit but for this I'm just going to show you at 240 volts what the actual output here is what you get now this is 12 volts okay 12 volts each side combined together 24 volts so let's just switch it on if you look at the meter we've got about 27 volts there okay when I were to get to 240 we've got 28 volts yeah that's about 240 could actually go to 265 on this one but we're not going to because we don't need that so we've got more than what it says it says hey we only need 24 volts and that's absolutely true we only need 24 volts and this is the thing about line regulation now as well when this has a circuit put on this it will drop to 24 volts around it's going to be a little bit of difference because the line voltage goes up and down a little bit and so it will go up and down on here a little bit now when it comes to being regulated normally the bigger transformer the better the regulation yeah because you're not trying to it's like if you've got yourself a little 1000cc car and you're driving around full blast everywhere because you know you want your full speed out of it everywhere but that engine's only just designed for it it's going to run into problems you're going to run into so I'm just going to turn the voltage off because I just wanted to show that for now somebody said something about a strain you don't go above 24 volts going in that's what it asks for here strictly 24 volts so you don't go above it and the reason why that is is because by the time you get this converted into DC if you wanted to quickly do the calculation on that just times your 24 by 1.414 and that will give you around about 33 34 volts and that's what you need for this circuit because you're going to lose a little tiny bit remember you're already going to get 31 volts tops but it requires that extra to do everything else on the board so 24 volts tops if you have under the amount of VA that you need it will pull it down and when it's pulling it down if your current if your circuit requires that much and it starts pulling down the line regulation that means that you you're not going to have your 24 volts anymore it's going to be dropping down dropping out of it and as you're using circuitry that doesn't want that to be happening uh you'll find what you're going to find is you're not going to have the output that you want no that that will be the main thing of it you just won't have the output that you want now there's something else I've noticed about the circuit and I've let me just put that out the way there the camera's getting knocked about everything let me just connect this in this is our 24 volts going in alternating current now you want to run this you know normally you need a load on it really to be honest with you but uh you just keep it in always have a heatsink on your main output pass transistor like I said when I I went over the boards and what I found you've got to make sure that you've got these uh I am 41 48 correct and you haven't got the five volt one in the place how do you find that out well you know what you do is you'd have a a power supply and you'd run it up to because you're looking for five volts you go up slowly but to go up the five volts your current limit because you don't want to pull a lot of current through this you could just current limits that's 25 milliamps something like that and then as it's going up to the five volts and it just starts going over the five volts you'll see it starts taking current and it's at that five what they can see then you're on the five volt thing the other diode they're not going to work like that and you can actually they can test them different to that anyway for the forward and the sorry because they they are just literally high-speed switching diodes they don't have the uh the zener effect and that's what you're going to be looking for on your five-volt ones so these are all incorrect and you can actually see like I say on these diodes here you can see where it says five volts on the other ones it's not very easy to tell them at all on here this makes a difference to the value of this so let me just put a bit closer to you see on here so yeah this uh this value here is 270k this should adjust the value and you should be able to see as you adjust this the value of this change on this it works and all of these ones these are the original highland right but this isn't and and this makes no difference across here again this one makes no difference across here they are different again like the you know these are these are uh jaco these are chong this is whatever it's called and this one's on here is another one it's very similar sounding but it is a different uh and you can almost see as well the on the sides of these almost looks like it's well it looks like it's just weird on the side but on this one it looks a lot more straight cut a lot more but it just looks like it's i don't know correct that one looks like it's all sort of blown out a little bit as well so let me show you let me show you um on here because we can still see this cut uh right so let's just pop this out of here for a second and just turn this up turn now i'm going to show you the difference when this uh when this turns now all the other resistors are all okay from what i can tell they all seem to be okay it's a bit hard as check the capacitors but i think that this is going to make a big difference because this is how you get to tune the low voltage but this isn't this you know this the actual thing works i took one out of another pack so i've got another four of these well for the duff ones anyway so far it works yeah it is a hundred k and that's what it's supposed to be it is a hundred k it's a little bit above about 103k and it goes down to you know just a couple of your owns i'm not sure why it's not working on those but let me show you on this one anyway now this doesn't need to be on for this and it's not because it's the uh the things are off there the connector so what i'm going to do then is i'm just going to put this where's my little twiddly d let me just put that on one side doesn't matter about positive or minus now mine should be set oh come back in mine should be set right about 28k i think it's supposed to be if i can actually get these to go on there there you go about 20k all right and if i were to adjust this around let me just get my connection if i were to adjust this around i can go up and i can go down yeah now if i do the same on this one i am to do the same one here oh let me get that in there see now on that one look 20 it's 200 uh let's just do that and it doesn't matter how it just started clicking ten it's the right so if i right so it should have gone down a bit like this because i'm not like these on here probably but it doesn't matter how much i twist this just keep going down for a bit even though it's not uh it just stays the same 268 and this is on a genuine board but i'm not quite sure what i was just getting on here at the moment i mean everything seems like it's okay but there's a possibility i got these messed up there is a possibility i need to snip them out and try them i've got replacements so i can replace that anything i need to uh but and if we look again on here this is one of the the ones built up and if i just do the same thing here and it is the same across the other ones i've checked them all so there we go we've got that one on there again it's at its full go 270k it don't matter that's clicking so i've turned the right way around and it doesn't make any difference whatsoever i'm here this works this is my worker for using less va than the board will require you under full load well that that's going to unbalance things you want to get what you need 90 va let's say with a bit of overhead and what you'll find for that is a 120 va transformer 12 by 12 will do ideal or just a 24 volt straight output would do ideal now somebody also said about the current now i've seen the manual yeah it says absolutely uh three amp maximum and i think that's because if you were to try and pull a heavier load through this i've had four amps out of mine if you and that's at a lower voltage layer so i wasn't going at 90 watts but i did have four amps out briefly um it didn't stop i just didn't want to keep pulling it like that because the circuit is not really made for that i'm using 12 volt bulb uh trying to get um you know 55 watts out of it this is a 55 volt bulb and it would run to four amps now again a lot of this is going to depend on your transformer if you're using one of the old types transformers the i and e and i types uh you know you might need slightly higher this is a toroidal so i i lose less eddy currents out of there it's more efficient on one of the i e's e i's uh and that's one of the reasons why i use them to over engineer it a little bit that's better if we were going to put 28 volts nominal direct once it's got a little bit of dropage on it because the circuit sits on it then that would be too much for this it'd be too much for these these are only good for 36 volts uh 18 either way 36 um as a full swing but that's ideal because it's just less than that really once we go into dc around the board and i'm going to try and work out what it is i'm just going to look to see if i put any of these in the wrong way around so i'm going to just take out because there's only two five volts so i'm going to take out two five volts and just make sure they're correct if they're not uh means you know money to review the wrong so first one's here it's going to be here where are we putting a little bit of solder on that just makes it easier to tabs are there they're the little uh leads i'm just going to pull that a bit straight so that hopefully when i warm that it'll just drop out hopefully put this down like this i do actually have a piece of apparatus to help me to help me do it there right there here we are we'll know things where patience is really a virtue i don't want to damage it see i'm trying to do it as gentle as possible so i don't want to damage it so i need to be able to test it almost through come on pull it long ways a little tiny bit and then just get it from the back here there we go you've got to be really careful not to damage the tracks sometimes when i'm doing things like this i don't even i don't even bother what i'll do is i just cut it the right thing just to just attack it on the top so let's have a little uh let's have a little play with this then well all right so i'm going to set this now to uh i'm going to set it to uh six volts right and i'm going to set the current uh to now if i just move that across so you can see on the side six volts here i'm going to set the current but i don't know 30 milliamps 30 uh milliamps there we go so that's what i set to there yeah so basically when i turn this on now what we should do is put this into the the voltage uh the whole part which i'm going to i'm going to move this across so you see where it says uh six point i can now drop this down here if we go uh the stripe part to negative the cathode and then the anode to the positive what you'll see on the screen over there is a is a straight through connection right there it is up to 30 milliamp i'm reducing and it's pulling them it's pulling the power down but if i do it this way nothing should happen nothing now what we're going to be hoping is that as i start turning this up we'll start seeing the current go across because we get to the zener voltage okay so around about now we should start seeing the current going up and there we go so we get to the five point one it lets in full current and we'd limit it down to 30 so that is a five point one volt zener diode so that's in the correct place that's good news and all you're doing now is get the other one out okay so on the other side of here we've got our five and a row turns across five and a row so our zener's here damaging the trace and that's no good it took that solder here we go so now we're going to do the same thing with this one again we can see we get a dead short on it to make sure that we do have it not working one way so this should just pull the voltage in the the current the voltage has come down okay voltage up current down voltage down current up and now this this way around we're on four point nine volts so this way around correctly and now if we uh we start just going up there again five okay so it's gone over and that's it we got it's just gone slightly over there to do that five point two but again it's doing its job so we can say that they are in the correct place on that okay guys so we've gotten this far and I know this is the one that should work anyway I'm not bothered with the voltage regulator there just for a moment we're just going to nick these things off here yep we're just going to nick these things off here and the connections from here and also the pots so I've got a ten-term pot on my voltage and that should be another one kicking about I'll find in a second uh for this the LED indicator on here is actually on the board something I'll probably make a different uh a change to as in when let's take these out of here now there is one I'm showing you this because I just wanted to show you that well this is it you're going to get to see with me and we're going to wind up the voltage on this as well and just see uh just see if we've got any problems from there from the get go um one of me will wind up the voltage just turn it up slowly and get this on could do the here's the current it's already pre-made up you see for the other one so I'll try it in here because I know that these are the correct way around as well so you know if we go to the right it turns the currents up and go to the left it turns the current down but I can't remember it should be like this I presume it's supposed to be like this uh and it's still anti-clockwise in the range of it no matter which way do it let's get this in here I'm going to turn that down in the backgrounds so I don't know SDR radio all right guys all right so here we go then so I've got a camera over there just looking at what we're going to we're going to look for this current jump it just starts going up too high as I as I start to um putting up that power there you know let me just check that we got that socket on there we go it will indicate that it's come on now I'm hoping you can see that all right run zero volts uh we need an output monitor so I'm going to put our voltage on here I'm just going to see that we're sure I don't have too much of that light in it there we go that's for DC um because it's in auto range it will jump about a bit as it's and as it's um doing the power going up the voltage positive out and negative out I'm hoping that's going to fit in there it does I should just fit in there I've checked as well and now the resistance is adjusted when I probe here on resistance and I alter this this now adjusts right let's give it a go then and your fingers crossed so we're going to go down with the power on there nothing untoward going on on the uh current side of things and as I go up to 20 volts 40 by right if there was a problem on that you'd have probably seen that already but that is actually going up in current isn't it that's going up in current the way it shouldn't be going up in current let me just adjust that and just let's just look at that again we're watching that current going up we don't want it to go up I mean that's a three amp dial all right so as we're turning this up and you've watched that current start going up that's when we know there's a problem all right so we're just going to we're just going to discontinue that test now because we know there's a problem we know there is a problem because the current's going up the way it's going up that was creeping up 500 milliamps going up towards an amp and just for having that sat there doing that that should not happen then it's going to put it down again just out of QSNL I can look back on the video but I was I wasn't looking at this at all I wasn't looking at this at all so I don't know what happened over there so let me just check that up again we are actually getting that but just oh as soon as that current starts moving I'm gonna so it that says it's on six volts but it's dropping oh we're looking at current going up see that's not good at all no no that's not good at all so we have definitely got some major issue there and we're not going to continue the test right I'll have to get another good look at it and see what's going on I've just noticed this glaring mistake it's here it's not working it's just there short and directly and if you look closely these are the two original boards and if you look closely but those are the keen sharp eye you'll see straight away that one of these caps is the wrong way around these big old caps here negative negative I've got a positive side here and even though I only took it up to a few volts you can all almost see if you look at the top of the caps there you can see one sort of push down in either one's puffed up very slightly you can see it more from looking at the top I suppose so we're going to take this out we're going to replace it and and try this one again and then hopefully we'll have a better result we're going to take that off there and we're going to hope that we haven't done any more damage and yeah less chance of damaging all right so let's do a quick little um do you want to put another cap in there look at what damage romego may not have done to this cap oh sorry what am I doing I'm on resistance I just don't know oh come on blimey sometimes I wonder how I get up in the morning without hurting myself uh okay that's having a bit of a 2.7 millifarad oh that's not the correct capacitance it's not correct so also we need another cap but that no I did have that push nicely for a minute all right no this of course is bodged here but hey it'll do the job and we're going to clamp this back up move these bits out of the way let's shift that out of the way let's shift everything out of the way that we want this we want this we can put this in for the voltage a 10-term pop just for more accuracy on the voltage I'm going to put that in there like that where now I'm just going to connect back into there I'm not even going to bother looking at the board again because if I didn't see that until today if I didn't see that until today but never mind right uh now we want um we want to check what voltages are coming out so that I believe is ground that I believe is positive quick little check on the board out yep it is quick got that turned all the way down so it's starting off with zero oh quick quick just a quick clamp for this because uh it does say even though it's not pulling any current let's just ignore it let's put the clamp on there and uh I'm just going to check that stop the spring from firing right down we go um I'm expecting to see that's on zero so I'm just going to turn it off one part of a turn all right so as I start going up in the voltage what we don't want to see is that current going up the way it was before and so far we're not so far everything seems to be okay all right so we're on 200 200 volts 240 okay so we just sit at that this is on at two and a half volts it seems to be going up it seems to be going up we seem to be going up we're going up we're going up we're going up very nice we're going up we're going up we're going up we're going to get to our 31 volt limit and that is the limit there so now on this one it seems I'm thrilled because that means there's another one here that works now I'm going to go back down to zero and this is where I can use my little trimmer here and adjust that down to as close to zero as possible it's got to get it to sit on it that's going up we want to go down this way catch up with itself because that is quite way really ah right I didn't press play on the other one I didn't press uh look at this look we can bring this all the way down let's just see where that settles so that's zero volts and then when we go back up the voltage we should go to 31 volts it was 31.5 before isn't it so let's just turn this up turn it up 31.45 there we go and that's locked hopefully we go straight back down again to zero oh this is quite a bit of resistance on these just turning this part and I don't mean a pun over you know what I said I just it's just quite difficult certainly well then we'll just see what that settles to oh dear there's hopefully that should go back down to zero it doesn't it's like we can just tweak it down a little tiny bit get a few more little place that part but then I'll be sort of like just happy with that however this turns I'm just going to leave it maybe just the warm and do is there any type of warmth going in there I can't feel anything so we've probably been okay but as soon as you pull the load on this of course then now uh there was a problem so okay we can say what this is good because now there's two working ones of these and did you know we're two working ones of these you can actually join the outputs together because they're linear so now we can have up to naught to 60 volts at three amps or not 36 amps at least that's what you're supposed to be able to do with that being linear be cool if you could anyway right so now we know that works I'm just going to back this off back it down to zero because that's good and now we're going to start doing some comparison in resistances across the boards and bits and pieces I don't want to do too much while it's on because if you start putting stuff across and it makes any of these become circuits you can just blow them up anyway I'm sure uh I don't know enough not to make that happen while pausing we can certainly take some measurements when the power's off and not connected so we give a go at that now