 Hi guys I just thought I'd build this little square wave oscillator and I've got it so we've got some various frequencies we got 1 hertz 10 hertz 100 1 kilohertz 1 kilohertz 10 kilohertz and 100 kilohertz and all I got to do is this one at the minute on one kilohertz that's why it's flashing one a second and I'll just move this jump across but what I'm going to do is I'm just going to pop up in front of the scope here so you can see this so that's the that's the one I'm going to switch it to 10 hertz there we got 10 hertz it says 10.5 I'm a flashing a lot quicker of course. Now we've gone to 100 hertz and it says 101 hertz the next one is 1 kilohertz yeah that's amazing that's possibly that's a bit rubbish capacitor I've got to my fifth my hundred nanofarad capacitor is only 59 hertz that's not really good it should be 10 kilohertz and that's coming up there's 9.6 it is jumping about a bit I think my connection is here good more stability there we go 9.56 and then the last one is a hundred kilohertz and that says 95 95.6 there you go you want to look at the circuit there it is just off the internet I don't know why I'm leaving there because you're going to always press pause as you can see by the circuit they're just based around 555 time a chip and then put that back to one that we can actually see it flashing there we go that's 10 hertz 10 times a second this is the greatest you know having these things is brilliant now a lot quicker I said because before I was having to cut all bits of wire myself and ended up with lots of slices in my thumb which heal quite quick so you can't really see them but there's lots the other day yeah so I'm gonna build something else now there we go guys and then a quick modification to the circuit there was a resistor between 2 and 7 56k and I've taken that out and I've put in a 10k resistor and this 100k pot which is here in series in placement of that what do I have there 68k resistor and now we've got variable you can see by the LED it's at that speed if I start turning it it's going to get quicker there we go of course that shows on the giving them wire the shoes on the scope of course these are all still variable I can sort of just all of these and go for the different frequencies all together we're gonna one kilohertz 1.2 1.2 kilohertz if I play with that so I said 1.09 turn that up to 1.5 2 kilohertz let's just see how far we go and that takes us up to 9 maybe 10 kilohertz that's quite a good variation on that then I'm sorry that my cameras rubbish you'll see what I did to one of those put it inside a case that panel to the right the blank part I'm actually gonna put a power switch on there since I fit the power supply and it switches on its way I've got all the rest of me for the power supply and I'll just build my own little regulated supply for in there anyway this is brilliant to play around with these things of course I was not gonna flush now so it's going too quick a speed it's going one kilohertz or 10 so yeah another great little quick circuit that you can put to go really quick and have some play on it I do believe I could touch this to a little umfire and maybe get the sound out of this I might I might get that going on yeah I'm gonna get that go