 Hey there guys, hi So I made another little power supply circuit Now what I wanted to do was get well, I wanted a little bit more than 24 volts in the end Per rail so this bipolar circuit has An LM317 here and an LM337 here And at the moment on the output, I've got a one mic Tantinium Can't say the word properly So I what I've not done and what I'm going to do is I'm going to put in I have to redesign the slow it I mean it works But I have to redesign it. I need to get a couple of diodes in And one of the diodes is going to be because I've got these 10 micro farad capacitors in Each side here. You can just see the tops of the cans there But really they're not necessary because my Supply capacitors are very close To this but then may not be the way that this ends up. There may be a bit of a Distance between these only a matter of a couple of few inches, but I just thought I'll put them in anyway because As it seems to be a good thing and I've put as you can see Put heat sinks on these regulators because they do get warm Now I've managed to get these to around about 27 volts each So we are native 27 positive 22nd 27 and I've used a 330 ohm resistor on each between the adjust and the output pins and then I've used a 6.8 kilo ohm resistor between the ground and you just spin on both so and that gives me Around about 27 volts now, although I played with this Experimenting to get these values these output values. I have managed to find the website which Well, you can just put the okay save myself a lot of time, but I like playing around with them anyway I like the idea that I end up with a hundred different resistors around me try an error, but there's this website here You can see the name of their music dot com And you can actually I typed into the search Oh, okay. It's animating 75 then now, but I typed into the search basically and then three three one seven resist values And this little calculator Was made available to me So I just confirmed that my outputs From the same as this so it's gonna Flip down this and you can see that there's my positive and there's my negative Now they're not exactly both the same I'm gonna assume this is something to do with branding of the chips I don't really don't know it could be the resistances in in these socket boards There could be a whole bunch of factors to that But that's close enough That's close enough, I think I'm hoping now And the reason why I chose 27 volts each was one these LM 1875s will take up to the maximum of 60 volts input So to get the full power out of them you'll get the usage of full power out and Also if I were to only have 25 volts Because this toroid here is it's 25 volts each side, you know the two corals I can put them together and basically get like 48 volts Exits 24 it's supposed to be but open circuit and no load it's 27 volts but Because if you take let's say just a 25 volts Inside 50 and then you times that by 1.4 that does your own about 70 volts so Splitting nose between here at 35 volts each on the input and if I was to only use 25 volts per regulator I Would need to let's say under one amp load. I'd need to dissipate dissipate 10 watts on each of these and And I did set it all up for 24 volts first because I hadn't thought it through Enough to sort of just narrow down narrow down and narrow down So I get you know the right thing and I wanted to get as much as I could for the chip They also have enough to actually power the regulator in the first place because we don't want to get to a stage where There's not enough voltage to regulate properly If I'm drawing too much, and I hope I've you know got this is it's not going to be pin-on because I've just not managed to do it like that, but But you know that that's I think we've 27 volts From the 35 That does give me sort of eight volts of Playability so I've got let's say four volts for the regulations we keep regulation and then only four volts that like let's say one amp To dissipate which is four watts So our fingers crossed. I'm hoping that that's going to be okay And so yeah, so this is This will be with a little bit of adjustment probably a bit of bigger capacitor just on the output here I'm not quite sure I'm going to do that and I've got a couple of diodes across now. It suggests on the data sheet I would suggest anybody wants to build one of these look at the on semi Data sheet. I'll put it up now on the screen here Because what it does give you and even though I've not quite used this Exactly the way this does it, but what it does give you just bear with me or we just get to this It gives you lots of application Okay, oh Sorry It gives you lots of application. This isn't the answer. Actually. This is ti Let me just make sure Because this is what I've been looking at For all the information I've been So it gives you Looking at the bloody screen. It's because I'm looking at this screen not looking at the camera screen That's sort of what I've gone for but as you can see But mine is different to that one. I don't have variable resistors I do have the two ten micro powered capacitors. I don't have They got point one so it's like a hundred nanofarads there I Got forty seven. I think mine's forty seven Mike Coming off my as my supply Smoothen fastest And I've got a even though my tantalum tantalum Is a one micro farad it is polaritized as well And I've used different values here, of course because they're going for a minus 20, you know And a plus 20 volts there So there is some there is some good information now. I'm pretty sure they'll somewhat on this Unseemly that I thought was pretty pretty interesting to know so I'm just gonna quick little scoop through it And if it's not here, but as you can see that there's lots of different ways of laying this out That looks like a much better version of the one that I've actually built in there in that little power supply there is But I'm not using the three one seven Using three three eights because they're higher ampage It's basically similar circuits that so you got adjustable voltage and current Which makes a great inexpensive? Little power supply which I find I use it all the time Not on this Was something because I thought I remembered it I told me so you need to remember that and it was on semi Okay, maybe you're for my own sake if I find it. I'll put a link to it or whatever But yeah, maybe it was this maybe it was because I was looking at this three three seven and it gave a positive and negative Supply here, which is really really handy And that's on ti Dot com or if I just type in LM 3 3 7 and you'll find it and these are the diodes anyway These are the the protection diodes for short circuit input and output short circuit protection diodes And I'm pretty similar to this. This is a 6k 249 This is probably about as close as what mine gets To the actual circuit I've done so trying to keep the camera nice and steady Yeah So I'm quite happy with that. So I've got maybe me me 27 volts per side I don't know it works already. I haven't got it set up at the moment because I Did have no I took it apart again. No, I was just about to start building this and I thought well I better do this bit first and Just in case it all goes wrong at least then I've got a small video of this And now I'm going to get on and build the rest a couple of these nice fresh chips Course this camera won't focus in on Because it's a bag of rubbish I'm going to try and set up my other camera as well So you can have picture-in-picture because I can focus in with the other camera, but I can't do the audio I'm going to try it in a second and give you a little bit of picture-in-picture. Let's see if we can do that So there we go LM317, LM337 Set voltage so 27 volts Even though this Is half a volt higher than the other one. I'm hoping that that's going to be down to resistance I don't want to fiddle about and push around on the circuit too much because these Wires as you can see on these that they're still quite long on the leads and if anything touches and does pop That'd be a shame So but this has been a different value before it was slightly lower So I'm hoping that that's going to settle out I get it put onto a little board Anyway cheers watching guys take care There's the power supply And there we have two channels And I don't know if these are going to work it. I'm still Just about to wire up This I'm going to stick a stereo jack on that And plug these ends into one into each channel And I'm going to try and play it from my From my laptop That's going to be easier. I might cut those wires down a little bit Well, that was fun building this So I don't know it's going to work yet. I'm pretty confident it's going to work I've made One change. I put a slightly smaller pass to him That's a three 330 nanofarads I think Yeah, let's take a look at it 334. Yep, 330 nanofarads And I swapped these out for even this one looks different to this but it's not and it's the same It's different make but it's the same Size 100 nanofarads. That's 100 nanofarads too, but 50 volts. I had 25 volts there That had 125 so I just change them both for 50 And of course these are the good chips now. It hasn't got a heatsink on just yet because I Don't actually have any to put on there. So I'm just going to power it Let it work for a moment or two on and then try and figure out what I'm going to do with the heatsink I did have one here, haven't I? Yeah, I got this but I'll have to try and figure out somewhere of clamping it to the back of there and isolating it as well because We're going to put it in there. Probably supposed to be isolated through each other If I build it into a box, that's that's probably what that's what I'll use for that The heatsink there looks quite nice, doesn't it? It looks relatively okay But I'll give it a go in a minute and we'll see who works