Hi Quite a few people have asked me for the tear down of the Keysight Edu three two one two, a waveform generator, 20 megahertz, dual channel jobby. so let's tear it down. This will be in 4k resolution for those playing along at home. This is part of their uh, you know new educational Value um series scopes which we've looked at and apparently uh, yeah, because I did a giveaway of, um, quite a lot of this gear and apparently they've been like due to her chip again the uh, component shortages they're still having problem are delivering those.

So yeah, there must be uh, something. um in? well they're having problems across the board as a lot of manufacturers and yeah, they have any problems. So sorry to uh, the winners of those who haven't actually uh received them yet. but they're still on the list.

So yep, um, yeah, once they get the parts, they'll be able to make them anyway. Let's crack it open. It is the same form factor as the oscilloscope and the multimeter as we looked at. so they reuse all the plastics.

Everything else uh, is practically identical in them. The metal works inside, it'll be all the same. So anyway, a sneaky little interlude if I may just to plug my Odyssey channel over here because I'm up to 53 000 followers over here. I think it'd be really cool if I got a hundred thousand followers on the Youtube alternative Odyssey.

That would be absolutely awesome. Anyway, if you like sick and tired of the ads on Youtube, go watch it all on Odyssey and you all My videos are there like minutes after they appear on the Youtubes and uh, they're in full full resolution as well. It's great then the Odyssey community. Lots of engagement in the comments and stuff like that.

Absolutely fantastic. I love Odyssey and I occasionally post exclusive videos on Odyssey as well. You won't find on my Youtube channel or any other platform I use. This is a photo my photo spectrometer that I've got 80 day tear down of that.

So go check it out and I've got my Eevblog2 channel on there and my Eav Discover as well and it's a really great platform. I'm probably doing like a third of my daily video views on Odyssey now. um, instead of Youtube. So and a lot of electronics are creators.

A lot of your favorite electronics creators are on Odyssey as well. Check it out as you can feel on the front panel here how they've still got the two little slots there for the Um oscilloscope probe compensation on there, so they certainly reuse the front panel there. But of course you can't reuse the like the buttons here. this has to be entirely different.

and in the Edu uh series here, you can actually feel the Um. two extra B and C's there. So yeah, the the fourth Uh channel plus the uh sig gen. Yeah, I do believe that's exactly the same metal work.

Exactly the same mains interface, Exactly the same like metal threaded inserts here. Um, which did have the gunk on the Uh screws? Excellent. Um, and probably got the same power supply. I would say.

you know if you're going to reuse as much as possible, you would also try and reuse the power supplies even if it's like overrated between models and stuff like that. Because you know generally you would design it around. if you've only got like 5 and 12 volts output or something, then you'd uh, do a plus minus 12 or whatever, then you would, uh, design uh, your product around an existing power supply so that remains to be seen. Let's get the metal work off.

All right. So let's lift that off and Ta-da we're in like Flint. Yeah, it's probably going to be an identical power supply. I will take the cage off that somebody had fun with the silastic gun.

Look at that beauty. Oh, all right, because I can. I've taken apart the Edu series oscilloscope and here they are precariously a balance. Don't try this at home kids, I'm a professional.

Um, but yeah, as you can see like it's identical metal work, everything else. it's in the balls designed to fit in place like that. So there you go for those playing along at home that looks identical to the original 1000 uh that we've taken apart before, done tear down of and also hacked. And here is the new function gen up here.

So yeah, all the chassis is the same. all the metal work cutouts, they're all the same. Everything's the same. Let me show you the power supply.

and as predicted, the power supplies are absolutely identical. If I get that cable out of the way, check it out. Except that the oscilloscope has a couple of black caps in here instead of green, so that's interesting. I don't know why they mix those up, I've got no idea.

But yeah, no surprises for finding identical power supplies, right? Completely swappable. They've even got the same part number, have they? I believe they would yet. Just different manufacturer codes on them. Now spot the difference, Spot the difference between these.

Leave it in the comments down below. There is something actually dramatically different between these two power supply assemblies. Can you spot it? Can you spot it? Leave it in the comments Now down below. I guess I will spoil it for you after this.

Can you spot it? The fans are mounted back to front. Look at this. This is the Function Gen here, and this is the oscilloscope. They're exactly the same uh, brand and model fan, but one's sucking in, one's blowing out.

Um, which is the right one? I don't know. Are they installing them just randomly on the like. Is it an actual assembly error? or did they decide that? no, we're gonna, you know, suck the air in on uh, one of them and blow it out on the other? I don't know. Uh, Keysight, Daniel Mueller, Beulah Beulah And the brand of Cap is literally okay.

Cap. These caps are okay. Same branding on the output filter caps as well. They're okay too.

Anyway, it's a very neat and tidy power supply assembly. and yes, the output voltages and the output cables are exactly the same. I'm sure that I could completely interchange these and it wouldn't make a difference. I could like mix up these back shells and I wouldn't even know when I put this uh, back together.

But yeah, it's got no shortage of Um. output. uh, filtering. A To220 is flapping around in the breeze here.

but you know someone had fun with the Scholastic gun. Um, but you know, yeah, it actually looks, uh, like a decent layout. Keysight almost certainly didn't design this as most companies don't, they just farm out their power supplies. But yeah, no, it looks nice.

We've got a nice uh, spade lug going down to the chassis down here. No wackers. Everything's all heat shrunk. We've got input fuse in here.

We've got a Ptc there. do your X and Y class, uh, caps, or your common mode chokes all the requisite stuff. No worries. I mean, it's only like you know, a 30 watt power supply or something.

All right, let's take a look at this board, shall we? I'm actually capturing uh, my 4k screen this kind of time instead of my regular 1080 screen. so let's have a squeeze. You can see that we've got the Cyclone 10 Fpga in here and no surprises for finding that part number for those playing along at home. There's many varieties of the Cyclone 10 series.

you can pay. Well, I'm not going to say peanuts, but you can pay like orders of magnitude difference in price depending on the amount of silicon and feature set in there, so I don't know what that one is and not really that fast. Bit weird to see the old Intel inside symbol on there. Um yeah.

so anyway, that is surrounded by some memory here and up here as well. We've got our controlled impedance Wiggle Wiggle Wiggle yeah, tracers all in here and also going out to our Dac out here. Ah, bloody Earthen View. Can't do multiple level undos.

That sucks anyway. for those who don't know all of these wiggle traces here, these are of course matched length. So when you're talking about uh, the speeds going to uh, Ddr memory these days and in this case, go into the dac then yeah, you've got to match, uh, the length of the lines. So this trace that goes all the way on the outside here that has to match the which goes further so that's your longest one and then your shortest one goes from well you know, like into here like this so they've gotta match the length there and overall those two lengths will be matched.

So you skew your data skew and your clock skew and everything else. Um, your timing is pretty matched. Uh, with the distances. even with the small distance was we're talking about between the chips there, which isn't much, but still, it matters once you get up in speed.

yes, I'm not sure what speed the memory would be operating there, you'll guess as good as mine. I mean, this is only a 20 megahertz, uh, bandwidth thing. So the Tx uh Dac here. But of course, you've got a 20 megahertz clock cycle.

You've got to be spewing out more data than that. So the data rate is high. that's why all that stuff in there has to be matched. And the Ad9747 here.

that's a dual 16-bit 250 meg sample. uh, per second, a dac. So as I said, yep, it's pretty, uh, quick. And then they've just got some drivers here.

Of course we can go in and have a better look at those numbers there. 51 661 I think these might be intercell uh, El 5166's so yeah, which is now Renesas and they're 1.4 gigahertz bandwidth current feedback amplifiers. Yeah, that'd make sense in that sort of application. And would this be some offsetting? I don't think that's local regulation.

Not sure what the deal is there. Anyway, they're going into some relays and attenuator networks down there to get your various low output signal levels and whatnot, and then your extra stuff down. here. These are your two output, uh, Bncs.

You can see, uh, there's a bit of residue on the connectors there. They're hand soldered so a little bit how you doing, but it's neither here nor there. Um, and then of course there's your 50 ohm output impedance there. and it looks like they have dual drivers there with 100 ohms in series each.

and they parallel. Looks like they're paralleling those up. so because you can see them joining at the output here and they've just got some output filter in there, you can see a couple of little chokies down in there. But yeah, that's interesting there.

They've paralleled those up and you can see. look. the here's the output of the attenuator network and then that's going. That's split in into the two sides here.

so they're paralleling those up, presumably to get extra grunt out of that. You wouldn't be getting extra like they wouldn't be. Of course, you can parallel, um, the amplifiers for reduced noise. but I I don't think this is a stellar performer in that regard.

So they're doing that for extra output grump. And there's your Pll uh clock gen. Uh, that's an Lmx 2582 for those are playing along at home. Uh, 10 megahertz reference? Uh, there does this accept? No, I don't think this accepts an external 10 megahertz input.

I'd have to check that. Um, but yeah, that's the pll uh clock driver. uh for everything. but apart from that, not much else doing.

And this is our calibration output here. We've got a 74 Ac 405 one. Joby for the win. Old school, old school again.

Tl072. Love it. Don't know what that analog devices are. Jobby there is this.

here is a ground connection. Uh, very nice If you're designing a product like this. It's a very, um appreciated to designing little ground loops like that. They don't cost much and you can put your oscilloscope probe in there and very handy for getting there and probing during debugging.

And this here is our trigger gate burst. Well, that includes all the circuitry there. Um, and then this is our Um sync output here. which is nothing.

It's just got a little like a transistor driver on the output and that's um, it. because all it does is a trigger output pin. That's it. Um, no workers and got some other Op amps.

uh here. Tlv274s. I don't know what they're doing, they don't seem associated with anything in particular. at least not on the top layer anyway.

Meh, whatever. Just uh, some housekeeping Op amps. And then of course you've got all your regulation stuff up here. Good old old school 79.05 for your negative five volt regulator 7915 up here, one 7815 and seventy eight oh five.

So we've got plus minus five volt rails and plus minus fifteen volt uh rails for the Op amps of course. Very nice. You want the head room on the Op amps? So um, yeah, that's interesting because that mean this is, uh, linear. So the output of the power supply that must be not plus minus 12 volts.

As I mentioned before, it must be like at least there's got to have at least a 2 volt drop out voltage on that. So it's got to be like plus minus 18 volts or something like that would be my guess. You want to keep it down so the dissipation in those isn't much, but you know. Yeah, there you go.

Anyway, there's another switching reg there that's probably for like a 3.3 volt. Another? Well, there's another linear reg. there. is that another switching jobby and the one that's left out there.

You go. They've left out another one, I don't know. Miscellaneous, uh, circuitry. but yeah, like there's not much in it.

There's a Cyclone 10 Fpga some memory, a dac, you know, output dividers, output drivers, and then just some calibration and sinky stuff. and a clock. Gin and Bob's your uncle although what is driving the screen. But of course, you've got to have something to run the operating system.

And there's our arm Jobby there. It's an Stm32h750 and it's got its own associated memory and everything else. And that it has its own Pll as well happening there. Um, so yeah, that fuse half amp fuse is gone.

It's gone. Ski. um, and then behind my head here, there's some unpopulated um circuitry. So that would have been uh, and including a relay and stuff.

for what external gate output or something like, I don't know, external? no, that might have been like no, because it's got a relay. It's going to say like an external 10 megahertz input or something like that. but no, I don't think so. Another unpopulated device there with a power pad on the bottom.

It's got a thermal pad on the bottom. I've got another test connector here. Um, not sure what's doing there. This would be going off to the touchscreen wouldn't it? And um.

anyway. so this would have like video driver and everything. uh, built in that looks like another switch mode controller that's doing something analog. Vdd is it? Okay, um, the power and fan connectors.

Nothing much doing. There's your real time clock, that's your 32 kilohertz uh, clock crystal there and that'd be. and that Bq3202 would be an Rtc clock chip. and there's your battery backup of course.

Aha, there's your video connection that's on the bottom side of the board there. You can see some uh, matched length traces going on in there as well. And then you've got all uh, series resistor terminators. So that's yeah, there's got to.

I'm not going to. I get the board out to flip it on the other side. I don't think there's a huge lot a huge amount there, but that would be the surface mount Lcd connector. uh, going off.

So this would be the front panel. Um, over here, that would be like the front panel and uh, controls and stuff. So there you go. I just took a bunch of um, high-res photos and didn't decide to do the 4k screen capture because my I could have done this under my tegano microscope of course.

but that's only uh, 1080p. So yeah, if I want to be able to and I don't really need to zoom in on stuff, but there you go. that's uh, that's it. It's all pretty basic stuff.

So there you go. That's a tear down of the new whatever part number. I can never remember these bloody part numbers. Why can't they give them something decent? Ah, I don't know.

Anyway, it's some part number 20 Meg function Gen if you liked it, give it a big thumbs up. As always, discuss down below. catch you next time.