 So I'll show you this, this little circuit, basic two-stage amplifying circuit, I've made it off this. Now, there's only values on one stage here, at the minute, but it is basically just replicated to the other stage. The only difference is, instead of having a 10-mic input capacitor, I've got here, I think it's a 220-nanofarad. There's not a great deal of difference if I use a 10-nanofarad, 100-nanofarad, 220, 270 or 330. They're the different ones I've tried. Sorry about the flickering thing, it's my lights, I don't know why it has to be like this, but if I switch it off, the camera, oh okay, the camera is not having a moody. Okay, I'll leave that off. So, there's some voltage values there. This is feeding with a 9-volt input supply. So with 100k there, on this voltage divider here, we've got a 7.4 volts. And then here, we've got 1.5, which makes up the amount of volts nearly. We've got a 1k here, a 3.9k here, 3.6 volts. And 0.92 volts here. I've used BC547s, both of them. And like I said, I think there's a 10-gen 20 there at the moment. There's the little circuit, nice and simple. Now this is the second time I've made this video. The first time I made it with this camera in my hand and did lots of different variations on capacitors and stuff, but I've basically just written them all down here. I'm not going to go through them all for the sake of the video in time. Yours and mine, but I used my other camera looking at the scope while I was doing it, and I was actually using this scope. And now it's had another flash update from Hantec. It's possibly a bit of corruption on the other one. It seems to be playing a lot better. It still does freeze and just reset itself and set everything back to factory standard settings, which is a bit annoying when you set it up the way you want it. So I've got three outputs on this anyway. I've got what's coming in from the... What's all this is? Fed use and this... Oh, I don't know how many you can't see that. It's 100 hertz. I might put the lights on just for this bit. There we go. 100 hertz, 0.5 volts. Okay. And here's the results of that. But you can imagine the top waveform there, the yellow, is what's coming in from there. The second stage is the blue. Of course, the first stage, sorry, is the blue. And the purple, or whatever colour that is, is the output stage. It's only fit for... I'm trying to get that window out. Sorry about that glare. You can see that the voltage is there. 880... 800 millivolts coming in, which is supposed to be... It says 0.5 on the function generator, but... 2.8 volts on the first stage and 7.4 volts on the second stage. I did a little bit of math earlier. It works out, I don't know what it was. This is slightly different because I've been playing around so much. But that's what I got earlier. We had 910 millivolts in, but I think I was on 10 volts or something coming in. But I've got it on 9.4 volts or something, which is normally what you'd have on a 9-volt battery, but I'll just put it to there. And it was giving me 7.44 going out. The quick calculation there, 8.175. I think that's supposed to be the game, but I don't think that is. I'm not sure. I don't think that's correct at all. Somehow I've missed on that, and I probably need to put it in down the bottom of the screen there, as I'm talking to you. But I see it. I just wanted to have a little play around with that. This isn't off the internet. This is partly from a book. I started to do a second stage off it when I saw a video on the internet and realised I could actually just do all these up. But I made a mistake last night when I did that, just thinking, oh, can I do that? And I put a 10-mic capacitor in here, which just made this output completely wrong. So I reduced it down to 10 nanofarads, and it made it good. And I've just been playing around for the last couple of hours to see what I can and can't get away with it. So there it is, nice and simple. Yeah, cheers for watching.