 Hey there, today I thought I'd have a go at putting one of these little AM radio receivers together, so let's get rid of that, this is a little receiver, based around the TA7642 which is represented here, the TA7642 is a one chip AM radio circuit basically, and it's got just about all the gummings built into it, now although I could get like a noise output I couldn't tune into anything, the circuit that I've copied this one here which is one that I just saw on the internet, it uses a 2in 3904 transistor here and I put a 2in 222 2in because I didn't have a 3904, but I did compare the data sheets and the characteristics of pretty much the same so I figured that would probably be okay, this here although I can see it's supposed to be electrolytic or polarised, I've put in a polarised ceramic 33 mic and I didn't have any 220 ohm resistors so I think the 140 is two of them in parallel and then series one to the end of the two in parallel, which give me a little over 210 ohms of resistance to make up this little circuit here, it's a resistant capacitance circuit, but everything else I've done as per what I've used ceramics, let me show you the module, you know if I place this here, well as you can see there look here's this little, get that out of the way, that's the capacitor, so there's the 220 ohm, there's the 33 mic, this is the transistor, off it goes, I've got a connection here which would go off, you go to the speaker, I end up connected to a little amplifier, I connected it to this CM386 and yeah you know I got noise but I didn't, I wasn't able to tune into anything and so everything else on here is the same, like I say I've just used these types of capacitors, these little ceramics, in here is where the, I was connecting up to this as my capacitor, my variable capacitor and this centre tapped, although I didn't use the centre, I just went to the two outsides, just the ferrite core that overwrapped with some 30 gauge wire, magnet wire, there's probably about 20 meters on there, there's probably too much, I don't know, from what I was reading it didn't seem to be too important but how much you had on there and the ones I've looked at on YouTube and other video places, they seem to have a varied amount of bindings for their aerial, so not such a great day for getting things done, but never mind, this is all the negative side, just putting in the negative onto everything, but like I said you know it doesn't do anything wrong, it doesn't start drawing too much current or it plays almost correctly but it doesn't seem to be able to tune anything, so I decided just to put that out of the way and say okay and I'm going to make it this little so here you go, and this is a, oh I don't know what's going on here, there we go, this is a cool dude Clem, he's got the same, there's the TA74, 7642, just here, this circuit I've actually seen him using, so I know it works and it's actually, he's changed a few bits and pieces around in it in order to put it out too like a little lamp, and then 386 amp, so this might be ideal for me, this transistor here is using a 54, a BC547 and fortunately as you can see that's a recycled, hey I got one of those which have to go out of that, I've got a few transistors, I didn't know one of those but I've got one, but it seems like there's quite a few that would actually do for that anyway, so I'm going to give this one a go next, now I've got one of these little tuning capacitors, all the ones I see have got three legs on them and this one seems to have five, and one that's like connected here to this, not quite sure what that's all about, but so I'm probably going to put this in place here rather than use this, even though I'd love to use this because my daughter got me this, and I will find something to use it for, maybe I can get the circuit working with this one and then swap it out for the other one, but I'll have to see, I've got a chip, 700 or 7000, TDA 7000, FM radio, if I can complete, I ended up getting four of these TA7642s, quite cheap as well, 70 pence each, because the first two that I ordered, the payment went wrong and I thought I wasn't going to get them sent to me, so I ordered two from somewhere else and well they all got sent to me, but never mind, I understand they're quite hard to get hold of, so it'd probably be quite good keeping hold of them, so yeah I've not built this yet, I'm going to build this one on the breadboard, I'm not just going to get up in the morning and think oh I'll just solder this all together, that's not such a bright idea, especially if you don't know who's going to work on that, I'm pretty confident this won't work because I've seen Old Clem do this and it seems to work quite good, quite well, so tomorrow I'm going to do that, tonight I'm going to sit back and get and find myself a few science videos and watch those and I'll have a couple of these, so yes, so this is going to be part two of the TDA 7642, thanks for watching, bye.