 Hey there guys, this is another one of those little Geofy circuits But what I like about this is that you don't need to be winding any coils, you know, any transformers You can basically just build it using the That there is a hundred millihenry Micro Henry, sorry Hundred micro Henry inductor, they're in the work They've got a couple of transistors, which are BC547s Now you could use a 2N2222 instead of those Just check the pin out, but they'll do the same thing anyway We've got 330 330 ohm resistor, 22k resistor and a 220 Pika Farad Sorry, capacitor And that's it And a good look there, look Quitting in the 0.83 0.83 volts coming from the old Solar power supply I should have signed that, but Yeah It's just basically another boost converter, I was playing around with this one Tried to learn some different combinations, different things Still got to try some different MOSFETs and resistors on it But I've been changing everything else, so I didn't change the transistor Maybe try and get a higher gain one or something, a higher gain MOSFET, whatever Back to this Yeah, so this this takes 2.4 volts just to come on You're gonna give it like three volts to get some good brightness out of it It is giving a reasonable brightness considering It's only at 0.82 volts I've got the circuit online From this website, it's got loads of great circuits on there, circuitdogram.org as you can see Loads of different little circuits, great to play around with Great if you want quick results and Satisfaction that you're getting little Little circuits built Getting the experience So yeah I don't know what you call it Two transistor dual-fifth I don't know Boost converter Because it is boosting it It's doing something, I need to Do measurements but I did try doing a voltage check on this And it said basically the same as what I was putting into the power supply So I'm not quite sure exactly how that works Not quite to that stage Yeah, just another basic little circuit there All worth to play with A little look at If you've got old batteries now I could put this I've got a battery in there If I set that there, you can see Out of the way And I've got this battery So that's What's it's got? It's got a 1.1 1.1 6 volts So we can take that off there If I set this lamp just here If I disconnect this Off you go Off you go Put this battery There we go So that's got the 1.1 Volts in that battery Could be the single star Cheers watching guys