 Hey YouTube So Is what I wanted to be able to do now there's a couple of ways of me doing this and this is trying it the first way because this is the The only way I've got parts for it Ignore this bit here This is I'm going to tell you what this is a Little circuit that just shows a sine wave, but it's 90 degrees out of phase with each other with itself, you know so So 90 degrees there 180 270 and You can view it on a sort of scope. It was pretty cool. But anyway, that's nothing to do with this I just need this part of breadboard Now I've got a little MOSFET here. I can't remember. That's the 840 or a IRF 630. It's the 630 because of the casing a 250k Potentiometer The 13 volt Xenodiod and a 10k resistor going from the gate source Of this What I wanted to do was on my solar panel It has a maximum voltage of 22 volts and I wanted to be able to control a couple of fans because At the moment I've had the I've had these fans connected up in such a way But I just connect on to be a wire going into the solar charger from the solar panel And it puts the fans on full blast Admittedly, I've got a couple of a couple of resistors Now these are 12 volt fans widened series And my solar panel maxes up 22 volts So that's okay but It's still blasting away when it's 16 volts There's no real heat being generated at 16 volts And so I wanted to find a way I could just get To stop but come on automatically when it gets above 16 volts For the voltage really I want to be doing this on temperature and that's ideally what I want to be doing And I've got a little ellen 35 Coming And I'll build a circuit with that but just for just for now. I've decided to do this on voltage So, yeah, so a little demonstration. So at the minute, it's over there on 16 volts I don't know if you can notice but my power supply is gone I sold it I made a hundred pound on it. I've got a new toy coming. I can't wait till it gets here And it's a great piece of kit that works on batteries again And I can charge it and run it directly from my batteries So I'm really happy about that And the sacrifice is brilliant because one it'll make me Get my transformer back and put that back into that linear supply there. She's not stood 30 naught to five amps current controlled voltage control linear supply of course, I still got my switch mode and I've still got my Powered by the by the Sun job. It's fair Anyway back to this so First of all, I was running it without without a heat sink and it was getting like, you know 57 58 Doing on the old temperature gauge there So I put a little heat sink on and that's good. I'd left it running for about 40 minutes and it wasn't really reaching above Wasn't really reaching above 29 30 So that's pretty good the ambient temperature in here is about 21 Little bit posh today. Got the heating on So at the minute as you can see there's no activity on the on the phones They're all flopping this camera about. I'm sorry about the mess. Look at it. Oh, yeah another Hour of time you're not gonna bit So right so now I'm gonna turn this up on me a bit crude about it I've only got to like 18 19 volts, which is Sort of working I sort of working there in As you can see there's one fans come on But that one hasn't so if I turn up a little bit more and go to like the 20 volts 22 volts Which is well Oh, it's gonna show me up now to be a It was doing I think it's because I've done it so slow. It wouldn't normally go up and down to slow So I just take that down Go up like if there's someone coming out I cheated I turned it above the 22 It won't get above 22, but it started off that family. I just got a bit more fine tuning to do with the With the part and I could say this isn't the greatest way you're doing it. I Do lose quite a bit of a now. This is the best way I can show you This is working I do lose, you know a good part of the air that comes out By having this part on because if I But it is blowing But if I turn the pot off, there's a lot more blow. I don't know if you can hear it There's a lot more blow Come in with it then you know run run directly with no With no control over this Yeah, I can turn that back down again If I just reset this back down to 16 volts because it's at 16 volts. I don't really want it on It's not warm enough to be on and And yeah, so I can read just that here Again, this is set so turn it up for more resistance turn it down for less resistance It's all counter You know, so I'm trying to do there so the friends that on there So I need to just do that so it goes off as you can see one one stops before you That's that 16.2. So I turn this back up again So you oh damn it. So we get it kicking in There we go. We got both fans. I'm gonna turn that back down. I don't want to overshoot it If I can actually want this to work, you know, it would be nice But I know that I'm gonna have to go temperature control really It's work properly. So this time They got to 22 Oh, they're trying not to jump over. That's it. There we go Now we got both finally, you know Who's it want so? Yeah, pretty simple circus. It is basically he's just putting the pot on to this So we just gonna run through it voltage coming in And that's obviously the voltage for the for the drain And we've got the voltage coming into the into the pot there Marble pot into the gate forget about the resistor and the truck and the Zener values for now And then we've got the source Which is gonna get out of ground, but it's gonna get out of ground through the two fans which are in series And then that's gonna go on to the other side of the pop to to the ground And that's it And then there's just that resistor the 10k resistor is to try and stop our capacitance between the gate and the source And that was in the diodes to try and stop the voltage. I'm going above 20 volts plus minus because if you notice I keep taking it up and working at 22 volts And that died there is a 13 volt diode so It baffles me when I try to think how that works go try and think of it in electrons and It's all I just tries to bend my brain a bit too much But that actually clumps the voltage so it won't get any higher between those Figure out and And the temperature, you know, it's quite happy with the Yeah with the Heat sinker the heat it does get a little bit warm I'm not gonna try any clothes on it, but it does get a little bit warm But it's a nice little easy Variable control for I suppose notice the fans. I Don't know if it laughs. Oh, maybe it would be noticed. I don't know. Anyway, so there we go I just wanted to show that it's coming proud of it for a while And I'm gonna make another one, but I'm gonna make another one which is temperature controlled to do exactly the same job But better Just watching guys