Hi For those who saw my Wonderland goal terment level meter tear down, and if you haven't, you damn well should because it is gorgeous inside and everybody loved this tear down. It was just a beautiful example of spared no Expense engineering back in 1980. Anyway, that wasn't the only Wonderland Goldman Bit a kid I Scored from that dumpster. Say hello to my little friend.

Isn't it just as beautiful? It's the PM G3. Isn't it cute? It's a boy. You can might be able to guess it's a signal generator. It's the 20 Hertz to 64 or maybe 110 kilohertz here.

And it's actually designed not only as a generator, but also as a receiver. basically a standalone bit of kit that you can you know take into the field. Speaking of which, it actually came in the original padded case here. shoulder strap, illan.

if everything. look at that. it's branded fantastic and you carry that out to the field. and you can check your telecom communications lines.

You know your telephone lines and everything back in the day. I Don't think there might be nice uses for this bit of kit. Still, really, if you do know of one, please leave it in the comments down below. but you know everything's a newfangled digital these days.

None of that voiceband rubbish. Once again, it just oozes build quality. Looks like it uses the same our diecast case construction ie. the diecast type, diecast bottom and diecast sides with the heatsink fins and it just looks absolutely brilliant.

It's got a gorgeous look and beefy carry handle. Wow at four G's that's not gonna, they don't make handles like that anymore. Absolutely fantastic, but check this out. It comes with the tear down tool.

We've got our Allen Key. This is the first bit of kit I've ever seen which comes with the tool to open it. Absolutely brilliant. Anyway, in the USA USA USA By Wonderland Goal Demand Inc it's the PM G3, but that was a PM G3 I don't know what the option difference is there 89 Wow All right.

So I'm gonna power this up. let's see if we have better luck than the other one Here we go. Not wat Wat Wat Wat again. Oh well, let's crack this bad boy open with our supply and opening tool.

Alright, let's have a sneaky peek inside and ah, there we go. Wow Pretty sparsely populated. 74 series logic. like in the can up there.

Is that a main oscillator battery pack? I didn't know. is battery powered? Maybe that's the option, you know? Almost certainly gonna be no good these days. Put some analog. E.l.f are three five 3s happening around here, but all manner of 4007 4c series logic on there.

There's a crystal up there and it looks like we have some sort of baseboard down here. Some sort of a side mounted motherboard. Once again, they probably haven't wasted much space in this thing. Check out the big copper strap around the transformer there.

Ah, thing of beauty Joy forever. I'm taking out this battery here. There's no screw to come loose. They've got it tapped inside this riser piece here.

Just connect the battery. That's not going to be easy to get out. Yeah. I Think the best course of action and the only course of action is to take the bottom panel off and then the side panel will just fall out and the battery will just slide out and watch this.

It's all just going to fall apart. just like the Bluesmobile Oh yeah, no it would have if I took off the the handle first. But anyway. yeah, I thought that was gonna fold out.

So anyway, we're in like Flynn Oh, look at those big caps. Oh, there's our side motherboard. so you're that. You get to see the Copper Stripe.

This is fantastic. Look at this. as I said. just look at the diecast side panels and front panel.

They're just absolutely brilliant. Spared no expense. Look at the twisted pairs on the back of this switch. They didn't want to route that on the PCB because they couldn't get the twisted pair.

so some gray beaded nude virgin has wide these up and in twisted pair to just keep it balanced. Look at those tantalum caps. They're just begging to explode out. They look fat as it looks like they ready to pop these tag tantalum.

notorious for failing 10 mics thank you very much. Thing's enormous that let's just adjust our IRA shall we bring all that into focus? all that goodness as I predicted. Very little wasted space inside here. Good, great volumetric efficiency and everything's just jam-packed height-wise between these boards.

It's absolutely fantastic in there. Take those out and these boys will just slide out for us to have a look at each individual board. Fantastic! Anyway, my batteries packs gonna come out and 1988 I'd say she's Gonski sure you won't find any of that lithium-ion rubbish in here. Oh, it's not gonna give up secrets.

He's lizard prep for our protection. multiple wires for a dungeon see or for a sense line charge sense line at the battery terminals that would make more sense. Got our negative going off here. You can see that there are jewel cells in series and it's tapped off here.

So we have ourselves a bonafide bipolar battery pack here. Sweet! and they're hot snotted those together and is that getting a little hairy? Scary on the top I Think it might be I Thought they might have been touching, but nope, those bad boys welded together well. I'm a little bit surprised to find no namers in there, but of course they won't be no-name as there won't be a one Hello, they'll be like you know, a Panasonic Yeah, that is very scary NiCad know this lithium-ion rubbish. Who was the who? was a big player back in? What was it? you know, the mid 80s And of course with two four six eight, ten cells per split supply.

then we're talking about 1.2 volts nominal NiCad voltage and yeah, 12 volt plus minus twelve volt rail going on you. They're really gonna make sure these boards aren't going to come out. Not only do they have these bars screwed in here, but check this out. They've got this rod going right through a hole matching hole in all the PCBs that's his boards.

ain't going anywhere so he's just loosen a tightening screw on there and pull that out. Bob's your uncle. We now get access to all our boards except for the fact that you've got to take the buttons off. hey, that's the first one that came out there.

We go Dips socket a ribbon cable which connects over to the front panel. That's that's our display board. Genuine 3m of course except no substitute. Oh, there you go.

Didn't damage the pins rod one's tiny little bend on one of them. Let us get the second board out. The others have all got these switches on them and they're a dog to get out anyway and there's nothing on there that tells us what that is. It's 85 a 40th week 85.

That could be like a jumper link. like an option setting link or something like that. Classic all digital board with your classic layout. Not many bypass caps on there.

Don't need it. I've done my Monson video and classic Auto routed layout. Come on and do that. Please take some pride in your work.

It's a nice physical layer out. All the chips are in the right orientation when you lay in our boards like this of course. Old-school tips start even today. Really, if you a surface mount rubbish you want ideally you want to be shooting for all your chips in the same direction.

Why? Because you can and it's nice Gild the lily go on. The most interesting thing about this is that where's wally? Where's the processor? Well, we don't need no stinkin' processor. It's all 7/4 series or our 4000 series. Our CMOS logic drive in the LCD display.

so the probably go to some LCD drivers. But yeah, basically there is no processor, it's just a level meter. So all they're doing is got to convert the analog signal of course into digital and then just as simply drive the LCD Alright, can anyone spot the LCD driver? Do you know your 4000 series? CMOS numbers? I'm gonna leave that up to the viewers at home, those playing along at home. Come on, leave it in the comments.

So without even looking up the data sheets or numbers, you know you're gonna have some. Well, because of the package size, you're only going to have a like 4-bit counter, 4-bit latches, and LCD driver combined in the one ship basically counter latch Driver: where is it Where's Wally So obviously that is just a display board. And yes, we actually have the full service manual for this thing and we can know from paper we'll take a quick squeeze through that as well. but that's all that does is basically does some arithmetic and does some Leo latching and displaying and Counting and that sort of chairs is the synthesizer board.

I've taken the can off there, it just start popped off and what do we have? We have an MC for 1648 that's a VCO of audio controlled oscillator and we got a 401 one. Everyone knows of a 401 one is just a quad at Nan Eight. Thank you for playing a bunch of you know Elliot Op amps and stuff like that. but yeah, I can put up the schematic, you know I'm not gonna give like go through a complete design a block by block design exercise for this thing.

but this is basically yeah, what is it? 20 Hertz or something 264 Kilohertz synthesizer. but of course it's quite a jazzy in that it's completely digitally programmable in 1 Hertz steps. of course of course you do are all of this with a pretty much a single chip these days. at least the synthesis part of it Anyway, with a you know, a direct digital synthesis chip, those are the amazing chippies your tea for.

Granted these days of course weren't around back then, so you rolled your own using all off-the-shelf parts. I Can't get this board out because it's there's. got this back plate so it looks like I may have to undo the power supply section from the back and then of course it'll just lift out. By the way, just take a look at the cable harnessing guys through the Grommet there.

It's all very nice. Unfortunately, to get at that, you've got to take this back panel off. but thankfully they haven't stuck that on. It's screwed in.

There's the screws under there to get card frame apart. So yeah, it's just nice that they did that. Still just stuck it on. There we go that just slides out a little bit of extra room there.

Lift this board out. We don't win a chicken dinner and this is the level board. hence all the controls. If you want to have a look at the front panel again, correlate it to there and I give you a decent look around that.

there you go. Once again, full schematic and service manual is available so it could actually go through this block-by-block but I you know Mitch Do you want this to be an hour long? One thing you're rarely find in these: Wonderland Goal Terment products are bages. They just really aren't any. Check out these.

We've got some components that are standoffs. They're select on test kind of thing and then solder them in later because at the production stages, solder in the little pin offset things and then you can select the resistors and put them in later. they've got one over for the cap over there and this one is shielded on the bottom. A little bit of flux residue left over there.

somebody didn't clean up. That's common for the day. So when you're designing this thing, you can't just lay out your front panel willy-nilly because you have to group the things together on the functional boards because you've got the physical switches in into your PCB There's no front panel board and then some wiring harness going over or something like that. You can probably guess what the next field our board does not just spoil.

Spoiler alert right there. It's a filter. and there's our filter board. A bigger frequency devices are filter.

They're eight hundred and twenty seven. Hertz Of course that would be to correlate to some, you know, Ccitt or something industry standard. I'm sure someone will correct me on that. Look at how big ours caps on here.

of course these are one percent. thank you very much. These, of course would be a high stability Polly put the kettle on type and that's why they have to be so physically large. Because in a level board like this, a level control circuitry.

of course, stability is the key factor. You don't want your capacitance to drift over voltage or temperature or anything else. And on the back here we have Smith's potato crinkle-cut thank you. very much.

Over explained this sort of stuff before why you get all this crinkly. It's not actually the solder mask that's crinkly and back then this is common for the day. the entire board. The process is different back in the day when today we have what's called SM OBC or solder mask over bare copper.

So when they etch the PCB you just have the bare copper traces left of course and all these big ground fills will just be bare copper. and then they'll put the solder mask directly over the bare copper hence the name. In the old days they would do a in plate. They would roll tin plate it usually and then solder mask on top of that.

If you zoom in enough you can sort of start to see it on the traces as well. It's just not an even process. It's not our hot air leveled or anything like that, they it just is what it is. and then they solder mask over the top of that.

So you're left with all these little waverly crinkly things, especially on big fat ground planes. and you can see the residual tin plate down there where they're masked off. That's our masks. and we send the driver or I/o board as they call it before.

Once again out like we have some balance here. some balance transformers. Once again, the Big 10 Microfarad are Polly. put the kettle on high stability coupling caps there.

Of course they're not. They're not doing any bypass in there. You know the coupling the things because you want high stability in your coupling caps to get good linearity at all. That sort of business.

It's not much else. doing the Lm317. Thank you very much and dumbass Dave does it again. I think I've come a guts and there's probably been a whole bunch of you screaming at me since the start of this video.

Dave this isn't the on/off switch. look it says dial there the power LED here I Just realized that there's another on/off is at first I thought it was a clicky you know in stop thing. you turn it off and then on and then increase the volume. but no you pull it.

and I'd even printed out the schematics and everything. just getting ready to troubleshoot this thing. It's just a linear supply. Under there was the that dial part with the Lm317 and stuff.

It was yeah. Anyway, I don't think we're gonna need that I'm gonna pull that and I'm assuming that's going to come on. Whoa. Listen to that.

Do that again. That's beautiful. You hear the oscillator starting up. One thing that's interesting to note: when I change the level display, you'll notice the frequency change.

It's bouncing around there. It's got a stabilized can I smell something. Check this out. This is the most amazing thing.

This dial. Do this look good. Spin it. Ah, it's pornographic going up.

Love the noises and yep it does actually work. A treat. Check it out, you see it. It bounces around, it takes a little bit to taste, a little bit to stabilize there.

Mmm whoa Whoa, that's not. Well, that's not looking too good is it? That's at what? 40 Hertz Oh okay yeah. I think yeah and only goes down - no supposed to go down to 20 Hertz that's 37 Hertz So sorry you can't and it's not easy to read the LCD but that's 37 Hertz Wow It's a bit how you doing and then all of a sudden that just comes. good.

Almost comes perfect at about 43 something like that. So what? 20 Hertz Give me a break and does that at lower amplitude - so not sure if that's normal. Yeah, love it. and the level is okay, but it does actually in according to the display here.

it does actually jump around a bit I thought I'd just single cops shot capture that. but it's fine. Jeez, that's annoying. So the yo I Hope you liked and look at yet another.

Wonderland Goal: Turman A bit of kit the little brother this time to the other one which was, well, this is like an all-in-one unit. The other one wasn't quite all-in-one it was designed to be part of a system. There were other units which are tired and gather and you can. Someone pointed out that you can hook them up to plotters and things like that and actually get frequency response plots and all sorts of brilliant stuff like that.

But anyway, this one was cute I Love it. but yeah, pretty much salute these days. What would you get for it? Ten bucks on eBay maybe I don't know. but anyway, if you liked the video, please give it a big big thumbs up.

look at the size of that thumb Wow all in 4k and as always, comment down below in the comments or over on the Eevee look for and yes I will eventually get back to the other one DeLand gold him and one because as somebody pointed out, I missed an entire section of that and also I probably want to have an attempt at or appear for that thing too. so yep, stick around for that. Catch you next time.