 Let's make a little, let's take, what is this, it's the L7805CV, so basically that's a 5 volt regulator. Let's make a 5 to 12 volt variable power supply from it. Let's get the socket board. A few components here, there's a couple. There's a few components here actually that shouldn't even be here because these are just like, I just built a little voltage doubler just to see what's good. And we'll just pull it apart. Look at that, it's changed now. It's a pretty little circuit. Got 10 volts in again. 22 volts out. Or something like that, I can't remember what it just did. Okay, so let's get this thing a bit broader. So, right, first of all, what we want to do is control the voltage. So we're going to trigger the resistor on. This is a 220 ohm red red black. We're going to put that between the output and the common. There we go, beautiful. We need a little, tiny bridge with a wire. I'm using just little bits of Rekida, but it's really thin wire. But it's multi-strand so it does bugger up sometimes getting in these socket boards. But I've got some single core stuff and I've got some on its way so I can make more. More of these little jumpers. So what I want to do is get this side connected to that side. Shut this in for that. Sorry I'm not actually showing you. Some tweezers. Yeah, let's use this one instead. It's going to make it a bit easier. So let's press that in there. Press that across on that side. We've got a little variable resistor. What is this? This is a 10K. 502. That's a 5K, isn't it? So we've got a 5K resistor. Now, I always wonder, do I stick it on the middle one? Do I stick it on the other one? I'm never really sure. So I'm going to put it on the end one. I don't think it really matters too much. And then I'm going to connect the middle one, which would be the wiper, I suppose. I think I'm not quite sure how this actually works. Let's put it here on. And connect that to ground. I'll just check where my leg is. Turn that over with the... And just shove that in the ground there. Beautiful. Okay, so we can control the voltage. He says. Right, output. A little high-pass filter. 100nF ceramic. I'm just going to stick that in on the output leg. And that's going to go down to ground. So I'm going to use my tweezers. Big, bloody fingers. Okay, so that's going to go down to ground. And then I'm going to stick another capacitor there. And that's going to get a ground as well from the output. Just more for transients rather than ripple. I read that. I read that. No, I obviously read all it's having on. I just can't just do this. And now we're going to... Let me just make sure I'm missing anything out here. So we've got our output there. And that's ready. We can stick this in there for the output. I'm going to stick this onto a multimeter. And we can have a negative in a second. Right, input. I'm going to go DC in. I'm not going to put a little bridge rectifier there. I really can't bother. I suppose that'll make good for an X one. But not just for now. So I'm just going to go... I'm not going to stick a bit of wire in there, actually. I'm sorry if I... My lines get in the way. I'll be really silly if I just have the camera angled. So that's going to go to the positive input. To the input, sorry. And I'm just going to chuck that in there. You know, stranded wire again. So there's no support at all to one of it. And then I'm going to put this. I'm going to put this to ground from that input. This capacitor. It's a bigger one. It doesn't really matter too much, you know. As long as you make sure you've got the right voltage thing going on. That you don't put a lower voltage to what you're going to be putting through here. And that's not really going to put like 14 or 15 volts. You know, sort of car battery, 13.8 type thing that you might get from a battery. So you can just like, you know, have a bit of a variable on that. I've got a 50 volt. It's a thousand. A thousand more. Yeah, one five. So anyway, so basically, if we just give a little bit of a bit of jump wise here. So we can have a we can have a just jump this negative negative over here, over here. And we're going to have a positive input. So I'm just going to pop that into that same well. So it connects into the input there. Just make sure it's resistors are in. And then we want to. And then I just need a negative for my multimeter. Okay. I think I'm missing something. I'm quite sure it is. But a little quick look. Simple. How many components? One, two, three, four, five. And a few I six. And a few Ys. And you can take a like 13.8 volt, 14 volt. I'm going to do on this. And you can regulate it between sort of five volt and 12 and a half. So you don't have to worry about missing nine volt stuff or anything in between the five and the 12 and a half. That's pretty good. And I'm going to need just another wire for the power. That's what I'm going to do. For the power negative. I could connect it on to there I suppose. But I'm not going to want to keep it separate. I prefer that sort of a better color. Just so I don't get messed up. Because I know I class that as positive. I class that as positive. I think that was right there by black. I class it as positive. But if it's there with that, I probably have this as a positive and that as a negative. Yeah, I would have it like that. I would have it like that. So, okay. We don't need those other. Pastors. Pastors facing the right way. Electroletics facing the right way. So let's stick a 90 meter. I'll just grab that. And put it so we can see it in here. Something like that. To do something like this. Yeah, okay. Something like this. Where's the negative? The multimeter. Boom. Boom. And my tower leads. What about this here? Can we connect the negative to that? Do that nicely in case that they touch. And then we're going to do the other negative. The positive, sorry. For the power. So there. Okay. Right. So, my power supply is in the background there. I don't know if you can see that. But I'm going to turn it on anyway. You should be able to see it goes to 14 volts. If you can't actually get it closer. 14 volts. There you go. And on the output of this. The multimeter. We've got five volts. Just very, very slightly angle. I'm going to use my little screwdriver. And I'm going for a twig on this. With the variable resistor. If I don't knock it out, of course. Just be driving there. Should be a bloody finger. And we can go. Oh, put it too quick. We need to get back a bit. And we've got a nice variation between. We've got a five volts. And we can go. Turn that. And up we go. Six, seven, eight, nine. Ten, eleven. Twelve. Oh, look at that. I was going to say, bang on 12.5. That would have been a bit cool. But, so we can squeeze like 12.6. It's not going any higher. Between five and 12.6. And that's pretty good. Because, really, I could adjust this down, actually. If I could adjust this to 13.8. Let's do 13.4. Okay. A little battery there. If it was in a car battery or something. I just wanted the little variable supply. But you only had a five volts. We've got 12 volts, basically. And you go as high as 12. I'm going to start backing that up. Again, and on five volts there. Now, the interesting thing. Well, the nice thing about this circuit is, with a couple of bits and pieces, like you can stick a diode. You could do it with a path back to the input. So we're not checking any power from capacitors back into the output or anything. So we could put a diode as a path back to the input of this transistor. We could connect a power transistor from the output to the base of the power transistor. And from the input to the collector. And then, instead of using this as our positive coming off, we can come off the emitter and have a high current. The little voltage regulator won't have to pass any current. You'll put it through the transistor. The pass transistor is called in that connection. And you can have the current passing through that. And the regulator won't need to be heat synced. You could actually use a different package. What's it, the 290 or something? The little tiny ones. And just heat sink your, I don't know, tip 355. Probably a good choice. Or a 2M355 if you've got stuff. That's got the holes in it for that, heat sinks. And have yourself a nice, you know, a bit of power. A couple if you want. Quite happily running through a tip 355. Oh, more than that, more than that. Yeah, brilliant. And of course you can do this with the LM317. And have a completely, on the output of the LM317, if you put a couple of power diodes, you can actually have it nought to your voltage and using this resistor here. And with the 10K part you can set it so you've actually got nought to 30 volts out if you like. Or using a 220, like it says on the regulator sheet. And you've got like 34 volts out. Depending on your voltage going in, of course. You know, that's my care. Of course, of course, of course. So, yeah. Nice. Simple, simple little circuit. Take that off. Take that off. Take that off too. And it's so easy to stick some six little modifications on just to get extra power. You have to rewire it slightly if you put the LM317 in because it's a different setup. This one's dead easy. It's input, output, the middle pin and the right pin is the output. Sorry, middle pin's common. And the left pin there is the input. They're simple. They're simple. I hope you've actually got to see that with the camera, guys. I'm still not very good with this whole camera market. But it's such a simple little tiny circuit. I'm actually going to build myself a... I'm going to build a couple of these basically together on a board. I'm going to use somewhere probably three side of tip 3055s. And I'm going to see if I can put together a dual channel power supply that I can use up to 60V by linking them together. It might be a couple of videos down the line so I'm trying to find a project box I can put it into. But I've got some... I've got pretty much everything I need to do it apart from the project case and maybe some more pots. I've got some 10-turn pots actually. Anyway, tangent, diverting. Nice little circuit. Brilliant. One of these things where you keep playing around with these socket boards building these little circuits. I'll tell you, you can learn so much so quick. See you guys. Thanks for watching.