 there YouTube. Well I finally get to use some of my 2N2222's and 2N3907's complementary pairs. I hope I've got that right now. 2907 yet. For this little tiny amplifier circuit nothing overly complicated. Got the complementary pair there. We've got the collector feeding into the base here. We've got a voltage difference between the two transistors using these two diodes. And we can connect our ATOM speaker to this. The input here should probably put a little long tabber input here as well. And that's where we're going to connect the positive side of the signal, the ground side of the signal to this. So I've built up the circuit. I've got to use three 10 ohm resistors here because here it wants 3.3 ohms and I don't have any 3.3 ohms. I'll just put 10 in parallel together and give me 3.33. And that's the only, that was the only snag with the circuit. Now any of these, these, as far as I can understand you can use any of these small signal transistors as long as you've got a complementary pair in them. Similar like a 2 in 22-22. To go there you should be okay. And it only requires 9 volts to work. Now it's not going to be the most, you know, the greatest loudness or even greatest sounding. But just for a little amplifier circuit just to play around with. It's okay. You can build on these little tiny boards. So let's put some connectors to it. Let's find a audio source and power it up. I should probably do that first actually. Put fingers crossed. It'll work. This is the first thing I notice about this one. I connect up the connector. That's a good sign, right? Let's give it a little bit of music. We've got a track here, ready? Now it's not going to be the loudest, of course. It's not very capable. You've got to get a, I think these two in 22-22 and the other one can dissipate about half watt. Then can probably run to about 800 milliamps. If I remember correctly, I'm just trying to find something else to put on. I've no idea. It works. It's not too far off. Yeah, there's a bit of distortion there. Okay, after rooting around a little bit of my browser history, I managed to come across a circuit. It's from circuits.com, circuits-today.com, which is the same as quite a lot of those other particular websites from that. Chappy calls himself a professional blogger and just makes multiple websites. What I did as well as I made a couple of changes was I took out the little transistors and I put a, that's a D822 and that's a D722, so again complimentary NPM, PMP and I also, because it was the first time I'd ever seen actually, where you got such a big input capacitor. Normally I've seen like one microphone and this one was for 70 and I noticed that it had a bit of, thought a bit of distortion as you could hear, you know, in the video. So yeah, so I changed that and I tried playing around. Now I know that the bigger capacitor would have less resistance, so putting in the one microfarad, I think I've got like a 1k resistor there in line with the audio input, but because it was, you know, you could hear it, you can hear it just before, you know, this bit when the music's on and the previous bit of video. You could hear the distortion and I did, I did leave it like that first and I just thought no, I'm gonna change it and then I stuck in like a, this is a one microfarad, but it doesn't, it's almost like it loses a bit of roundness of sound, if you know what I mean, without the electrolytic. I tried a hundred nanofarads and of course it just made it tinier because that's more like a 10k resistor. So let me just connect up the audio source again and I'll show you, there's not a great deal of difference, don't get me wrong, we're not talking like banging hi-fi now, but it's just that subtle little bit, I see you can have it that little bit and that loudness without so much distortion I should say. So let me just connect up and I'll show you. Okay, so I'm gonna use the same songs as well. We're still on 9-volts, what? Bear-volts. There before we had distortion, I'm hoping that the audio levels from the previous sort of clip and video, that's the right 10-volta, I've got no idea if the audio levels are gonna be the same, but I'm pretty sure, I'm pretty convinced it's pretty much the same, so I'm just gonna just drop another little bit louder. We all God knows how many thousand and five, it's there to what's in front, but only see to the side, and everybody sees evil, devious minds, if the people are the power, then the power does shine. I'm just getting back in the distortion now, but that's definitely louder. Well yeah, it is a little bit louder, but it just doesn't have the amount of distortion, it certainly doesn't have the amount of distortion. And if I can use it at 12-volts as well, even at 12-volts it'll take more like 72 mA. We get even less distortion, which I suppose is about figures. Let me just try a couple of different songs. This one's not so good, because this is mono, so you're only getting to half the sounds and this is, it's got a lot of bass on this and you don't really get to hear on this so much. I'm just going to try and find a song that I know is quite good. That's probably a bit... I'm just going to try and get to a song that I know that's pretty good. Actually, that one smells pretty good. It's a pity that we haven't got another channel, because really you should be able to... Not really as rounded off as what those speakers are, but they take a bit more power to drive them. And they're not that great on a response to be fair. They're not really, you know, speaker speakers. They're not really forward-facing jubbys, I suppose to be like behind you, I think. Let me just find another track that's got a bit dynamic. That's pretty loud. I mean, that is... Especially if you're going to turn it down. Especially if you had the two speakers, two channels. That's pretty loud. That is pretty loud. That's more than enough for comfortable listening to, especially through this rubbish little setup. Don't get me wrong, I like to sit in that sometimes and listen to music. The rest of this is just... It's all open source music, that's why I have this on here. It's not because I sit and listen to it. I think this is actually from my phone, I'm not sure. So anyway, enough for all that. That makes a definite improvement. And I'll show you, I'll just show you the difference now between sticking the 100 nanofarads in. Let me just have it out of volume so we can just compare it. I know. I know. A particular song that I like, or tune, I should say. It's just quite good, but let's recognise that. It's going to be like, I'm probably going to try and find the tune that I want. I like this. I can't understand the word the same, but I just quite like the beats behind it. I'm just going to pause this for a second and find a particular tune I want, because I was going to be here all day doing this. So yeah, I found this tune because I think it was played on the previous clip. And I like this because it's got quite a lot of dynamics. And this while I'm playing, you can't really reflect why I listen to it. I'll listen to anything as long as it sounds nice. To be honest, I've got no preference. I won't say I'm particularly into this, or I'm particularly into that. I just listen to anything. As long as it sounds nice, the more... I like that quite a soul in my music, rather than pop. Yeah, if you know the difference, you're probably there with me on this. But I quite like this because it's got a lot of different dynamics. And it's open source again. All this music is open source. I'm going to skip forward a bit because in case for some reason it becomes copyright. I can turn that up. Again, a bit distortion there. But honestly, that could be down to this speaker as well. I have tried different speakers. I tried this is why I've got this lead on here now. I connected it to the bigger speakers up there. I connected it to this. It sounds all right through this. All those injuries are just the tone slightly because of the different speakers. And of course, how the speakers are positioned as well like that sounds completely different to like that. In an enclosure, of course, it will sound completely different to what it does. Not in the enclosure. Otherwise, we'd all have speakers with many closures. Yeah, that's all right. And it doesn't really raise too much on the milliamps there. It sticks around. When it's first cold, it's probably about 47. It goes up to about 52 like that. 53 maybe. And it sort of like just sits around there. So it's got its warming. This transistor, although it's not hot, I can feel a bit of warmth up it. And I can feel it more than I can feel on that one. OK, little project to build as well. Maybe not a project as such, but a little circuit to build. And it actually does work. And it works better in this configuration than what it does, at least with the values there. I have, I played around. I, you know, I swapped out the 22-ohm from the emitter to ground just to see what the differences would be. And there are differences, but none of them really improved. Second, bigger resistors on, putting less resistance on. Yeah, oh yeah, and what I was going to do as well was do this one. God, I forget what I'm doing. Let me just play that. Let me just turn it to this. OK. Just bring my mic down a little bit so I can see the heels. Whip that out. I'm going to put this 100 nanofaradine because you get to hear straight away the difference. Big difference though, isn't it? Now where's that 470, which is what is on the actual... circuit? I'm going to put that in. Let's whip that out. It doesn't matter which way that goes round of course because it's non-polarising. This one it does. Check out the one around. Oh, got to get it in the hole. So you can hear the big difference there. If I turn it up, we've got this staunch from there. Like it's, like it's ripping at the edges. And if I just take that out again, I'm going to put this one like in the one microphone which I think is the person which I think is better. Let's go that way round. I'm just not sure what's going on. I hope you can see what I'm doing because I keep looking at the circuit rather than the camera. Same volume. It knows none of that. Ripping at the edges of the same. I don't know if that's the right terminology for that, I doubt it. I don't suppose it is. I'm just making this a buzz ago or a long. There's definitely a difference on the distortion type of thing. Right, that's it. This video has gone for way too long. Yeah. There you go. It's a circuit that works. Anybody that just wants to do it up a little tiny circuit and have a little play around with it. That one does there. Look, it's circuits-today.com. Load cost, amplifier circuit, using, I suppose I was going to say, three transistors. Okay. Cheers, watching and see you in the next one.