Hi welcome to Tar Down! Tuesday We're going to take a look at the Ryol Dp832 power supply because a lot of people asked for it. so we'll just do a tear down pretty quickly to see what makes this thing tick. Now the interesting thing about this of course is that it is a software upgradable power supply. so that means that uh, of course the hardware in this could be identical to the 832a, which of course has all the options in the back plus the uh color screen.

I mean this one has a color screen, but it's just uh, software limited to monochrome and uh, stuff like that. So this should be interesting. and I think we will find that the hardware in this is identical to the 832a model, but we won't find out for absolute sure until we open it up. Now there was a report on the EV blog Forum about somebody found a bit of rust inside their unit, so we'll see if that's the same case here.

Rust on the Shazzy I would uh, presume? So we're going to whip whip this apart and it doesn't look like I need to take these rubber feet off here. It looks like it's just going to slide off and it looks like my warranty void if uh, broken sticker is already a bit broken due to the fact that you know the Shazzy does. uh Bend Little bit of give on the bottom like that and it, uh, is almost peeled off. Ah well, we can fix that.

Tada Now it's completely gone. It turns out that we do have to take off the side handle here cuz that's the uh. the two main screws actually the only two screws actually holding this case on apart from the Uh rubber feed at the back which weren't directly connecting the shazzy in. but anyway.

um so what we expect to find in this is a basic uh, you know, a fairly, not a high-end processor. Of course there'll be, you know, a huge whopping P big uh Transformer in this uh, sucker, big linear Transformer plus um, some basic Uh processing. handle all the user interface and the networking and all that, enough to you know it's going to have to be powerful enough to uh, run a little OS in there and and do all the uh networking and and you know, file, uh stuff and handle the display and all that. um plus there'll be some um, you know, fairly Precision analog to digital converter and DAC stuff cuz this is a 05% class Precision uh, power supply and uh, really, um, not, you know, probably on a couple of boards and not a huge amount of uh, extra stuff.

So let's oh, got a big toyid check this out. Tada There we go. We're in like Flynn and that's it. Looks like it's shielded on top I'm rather, uh, rather surprised at that.

you don't often. Oh yeah, it looks like there's a board on top as well, so looks like the power supply board on top. Anyway, we'll open the sucker up and uh, but check out that big. that's where most of your weight is in that huge toid.

and I'm very impressed with the huge toid Transformer in this thing. And of course, a toid Transformer is going to be the duck's guts in something like this. It really is. and you're probably paying a bit of a price premium to get that toal trans former in there over your traditional laminated uh Transformer Now there are several advantages to a Pidal Transformer like this over your more traditional laminated core.

Transformer One of the biggest is that you get an increase in efficiency in terms in size and weight for a given power. for these pidal. Transformers they're just much more efficient due to the fact that they don't have all those separate laminated uh layers, you get better flux efficiency inside the thing. and uh, that leads to a reduction in size and weight for a given power of that.

Transformer So this is what 195 wat, uh, power supply or something like that. In theory, this toroidal Transformer should be uh, smaller and lighter than an equivalent required one. in terms of uh efficiency for this particular wattage power supply. Now, the second Advantage is uh, stray magnetic fields in this thing because there effectively is no air gap inside this thing.

It's just one large pidal coil like that that the wires are actually wound around inside. That no air gaps means, uh, less, much less? uh, stray magnetic fields for these things. And that's why they're used in uh, audio. you know, really high-end audio gear and uh, stuff like that.

Just much nicer design than your traditional laminated uh core type. So huge thumbs up! And it's also mounted on uh, the little Stamped Out feet from the shazzy here with looks like what looks like captive nuts actually built in to the shazzy down in there. So that really is, uh, quite neat. And it does look like there are some shake proof washers down in there as well.

Now I Can potentially see why somebody may have complained about uh, rust on their particular unit. It's a very similar, uh, folded sheet metal uh type thing with the riveted together that we saw in that siglent uh unit. but at first glance I Can't see any real rust on my unit at all. not even close to the siglent unit.

Hang on a sec that I Did find a little bit of rust on the back top end of this thing, but once again, nothing like the siglent unit. Really? I mean yeah, it's there. So yes, okay, technically this unit has some Rust but the like the cut out in the back shazzy. I Guess we'll find out more when we get into this thing, but it just seems to have a much higher build quality than what what we saw in the signal.

and even if there is a little bit of end R Us there from where they've obviously lasered or uh, you know, sheared off um, that particular, uh, part of the metal work and I do rather like this. uh, top board modular construction here if we whip that out. hey, we got some heat zinks it looks like we've got yeah, hang on. that just flipped out, uh, rather nicely there.

I'm quite quite pleased with that. We're going to have to undo all the all the all the board uh, interconnects and all the wiring harnesses to get that board out to have a uh, proper look at it. but the board quality looks to be first class as you'd expect and we'll have a brief look at the top board here cuz the top board is, uh, slightly different to the bottom board. The bottom board's got two channels as we'll see the top board only has one channel uh, essenti.

So the interesting thing is is that there's no processing uh, stuff on this board at all. It's all your analog uh, power supply stuff all in the center here which and you can see the isolated path around the board here which goes through here like this. and then we've got a couple of opto couplers down here for some. just some serial data going across there and of course all of our output uh, grounds on all of our com stuff, our Ethernet, our USB, and our uh logic uh outputs for example, and our Rs232 are all of course, electrically isolated from the output of the supplies.

And they've got their own little power supply circuitry up here, powered from a couple of little uh Taps on the Transformer up there. And then we've got our ribbon cable going off to our front panel uh board in here, which obviously contains all of the uh, all of the processing for this thing. and they're just feeding that data for the ethernet and the USB and everything else straight down to here. and any mystery to do with Is this different Hardware with the A model? Well, that's pretty much solve.

there it is. DP 832a They've got this on both of the boards, silk screened on, and also the sticker as well. So this is, definitely um, an 832a unit, and the 832 is just software crippled. That's it.

So even there assembly sticker there tells you it's an 832a. And if we have a look at the analog part of the main power supply board here, we can see that we have no less than four chips laser marked off, this one over here. this one, uh, this one down here, and that one in there, bastards. Why? It's not going to take anyone a huge amount of time to reverse engineer this.

You got to be kidding me. And there's our main little what looks like a processor or something like that. perhaps? Obviously, it's uh, right next to a little in circuit. you know, An8 P in circuit programming header.

there laser the thing off. You can almost see a few of the start letters there. Anyone want to have a guess and that's coupled down here to another 8. Pin So package completely marked off there.

It's got guard Trace all the way around here. Look at that so you can actually, um, you know, see that's obviously you know, not just like an I Squar C chip or something like that. It is some analog signal there that they're trying to guard against and you'll notice that here what looks like our voltage reference. I'm not going to try and uh, you know, decode one of these SMD marks.

There're a pain in the ass on that. So 23. But why have they routed out that little slot around there? Well, that is to isolate that device from any thermal stress on the board. cuz when this board warms up, which you'd expect to do happen inside a power supply, for example, then it doesn't apply stress.

uh, to the leads as the Uh PCB material Str stretches just a little tiny little bit half a B sck. But that might be enough to induce stressors into the lead of that voltage reference package there. So that's a very common technique. Just route out around like that and you get away from all the thermal stress issues.

And we got some retro action here. 74 HC 4051 Fantastic and T74 Quad Op amp Beautiful. Couple that into a T72 uh, dual version of that same device and we got another S So8 laser marked off and another one up here as well. So whether or not they're those three um, S So8 chips all identical I Don't know, um, but you know it looks like it's just an it looks like it's a bloody opamp or something like that.

I mean go, who cares? And to complete the Retro roll out LM 393 Woohoo! More of that action down the bottom side here of the board and we've got ourselves a free standing. LM 317 There, you know. I'm not always keen on those uh, freestanding packages like that. We got ourselves a transistor in there sorry I can't make out the markings.

It's really incredibly dark in there and uh, that's got its own little tiny teeny weeny. P freestanding heat sink. but the big heat sink here has one pass transistor on it I'll try and get the code off that, but once again, quite dark in there and that's a SE 0 N15 N Channel mosfet of course. No surprises.

150 volt, 76 amps nominal rating. so pretty much what you'd expect in there. and the other one on the smaller heat sink bite The way is a uh old school retro BD 136 And there's our current shunt resistor 20 mli Ohs By the looks of it, uh 1% But once again, um, absolute accuracy of this thing. can? it doesn't really matter.

It's all about the Tempco and how you trim this thing out in the software, so 1% is certainly adequate there. If you're going to Software W trim. No idea of the brand, but there you go: Smt C804 and no shortage of protection on this thing. This board has four Ms on it, and uh, these two are associated with the main output rail there and then our Transformer tap there is protected by a 5amp axial PCB Mount fuse and we've got no shortage of protection.

There's three other uh PCB Mount fuses on there as well. Very nice. And all the caps in this thing are both the small and large ones are all excluded exv L Samyong brand. Now they're actually a Korean brand.

Of course, they're not one of the top tier ones, that's for sure, but I don't think they're bottom of the range. They are all 105 cated so meh. And the main 2200 M caps there are looked like to be the TDA series. Once again, we got a bit of edge rust on there, but uh, that's all it seems to be limited to is, uh, just some of the edges that have been lasered off.

We've got ourselves a heat sink with two large bridge rectifiers in there. There's one down there on the other side and down in there you can see uh two Cosmo 321 triac drivers there. So obviously I can't get a look at those uh devices U7 u21 down in there, but they're obviously a pair of Trix They've gone to the effort to sastic down these two smaller caps here, but they didn't bother with the larger ones. eh? Now, I'm debating whether or not it's even worthwhile trying to ract this bottom board down here cuz it's clearly two.

Not identical, but you know, fairly operationally, uh, identical channels here. you know, similar. Arrangement Here, you can see the Trix over there with the triac drivers. you can see the main caps down here.

you can see the output. once again, all those Ms protecting the output there look huge number of them. We've got our Mains input here, which we'll take another look at, but we've got a tiny little separate heat sink down in here with our Bridge rectifier and well, it's pretty much, um, you know, identical to what we just looked at. Yes, we've got our chip There it is.

It's ground off down in there, you probably can't see it, but right down in there, there's the little uh in circuit seral SL JTAG header right next to the thing. and really, you know, eh. not much else except look at that, they haven't left it. Loosey Goosey They've actually bolted that to220 down to the board.

they didn't do that on the other one, just couldn't be bothered. and they've knocked some Emi on the head there with that little uh, Ferite clamp around the output leads. And in terms of Uh packing density in this thing, it's pretty darn good. I Mean with the board on top that that flips over with the heat sink going down, there's not a huge amount of room between those Uh heat sinks and air flow of course is going to come in from the side vents here on the Uh outside part of the case.

sort of. You know, over the Transformer a bit and then through the heat sinks and then going to be sucked out the fan at the back. So not too bad layout at all. and you'll notice the Uh daisy chain serial connector here going down to the bottom board.

and really, that's the only Uh data that comes from the bottom board. Everything else in there is just uh, you know, input, output, power wiring from the Transformer and all the front panel. So all of your Uh data is set and read via this Uh serial link wh Via this serial link here onto the main board which then of course we've seen Uh goes to the Main's Earth reference part of it Here, back to the Uh main processor on the front panel. So each Uh power supply module here for each Uh Channel must have its own Um onboard processing onboard, Uh voltage reference, and also analog to digital and digital to analog converters.

Now if we have a look at the Main's Wi in here I've actually disconnect connected the Uh these red and black ones down the bottom. they're the two they they come directly from the IEC main input down here and they go through these two uh cable ties here and they go down to the switch on the front panel down in there double pole switch and then that comes back to these two which I've disconnected down in here and sorry about this. It's a bit convoluted, but they come back to a little uh, isolated section of uh the main board down the bottom here which has some Uh input, uh protection and some filtering as well and then that goes off T all the way back here. It's a little bit convoluted, but it goes all the way back to the voltage selection board which is really good cuz they've got a Uh insulation um on the back of that and then that goes out from the voltage selection goes all the way straight into our toroidal.

Transformer Now if we have a look at our front panel terminal board, you can see this is our common grounded one. So this is our 5V uh output here and this is our 30 volt with the Uh. they're the two that actually have the common ground. Even though they don't actually look to be connected at this particular point, they will be connected back further on the board.

Now, the first thing you'll notice, of course, is that there's two wires going to each one: a power wire and a smaller sense wire. So this thing does actually do front panel terminal sensing. There you go, they got the wires going back and that's the same on all of the channels. here.

There's the other 30 Vol output one and uh, yeah, you know, obviously they've done that because they have to. This is a Precision uh power supply. You've at least got a sens of load at the front panel Uh, Terminals and they've gone into all the effort to do that as you'd expect. But you know, uh, the obvious oversight is.

well, if they went to all that trouble, why couldn't they include a little bit of switching and some uh, sense terminals on the back panel or something like that? I Guess you know I don't know, uh, feature creep? maybe? perhaps? Or you know they leave that to the higher end models or whatever. You know it's one of those differentiator things. But anyway, they have done that. and there's no shakeproof washers on these either.

You'll notice that, uh, the nuts have actually been solded down to the ground planes down there. Not sure if I like that. I Would have liked to have seen some proper uh Shake proof washers some Loctite that's about how you're doing un done. A couple of screws on the side and I'm going to prize off the front panel here.

Hopefully I can get it out in one piece and uh, we'll be able to see all the main processing on the front and there's really not much doing here at all. I might have to take this board out and flip it over to have a look at the Uh part used, but obviously look, there's only one BGA device here. you can tell by all the Vas in there and all the Uh decoupling around that of course looks like we might have some uh JTAG programming interfaces here perhaps I don't know, we'd have to uh, flip that open to uh, have a look And then we just got some ribbon cables. this one goes over to the keypad.

this one goes over to the LCD and as we've said, the LCD is uh appears to be the same on both versions and that's just one of those um, you know, module things with the some circuitry on the Uh Flex there some driver and uh uh inverter stuff on the flex circuitry. and then we've got our other ribbon cable which heads off back to the main board for all of our um uh, rear panel and uh control interfaces. Now you can't see it there, but I'm a bit surprised to find a 1,000 mic output cap there. that is 1,000 mics is pretty darn high for a any power supply which has a constant current uh capability.

Why? Because on a supply with constant current at any time, it can switch into constant current mode. but that constant current um might be limited. back further on the board, but then this output capacity here can deliver a spike of current uh, you know, energy directly into your load over and above that Set current amount. so during that switch over period.

So really, the design goal when you're designing any lab power supply with constant current mode capability is to minimize your output capacitance there. But they've whacked in a th000 mic, which is pretty darn high now whether or not they've done that, because that was the minimum value that they required for output stability. I Have no idea you'd have to go into the circuit and the actual design and how and the Uh loop performance of this thing. And just like on the sigin, I'm very disappointed to find this just this crappy folded part of the metal work here that the ribbon cable goes through I Don't Ah man, like the quality of the construction in terms of the Uh metal work.

although yes, admittedly, this one is better than the Sigin, but still I Don't know. it's a little bit ugly, but still, there's not much rust in this one at all compared to the siglent. And here's the main board and there's a bit of a surprise in here instead of the usual um Analog Devices Black Fin uh DSP We find in ton of other Ryol gear, but they've gone for a free scale IMX 283 arm uh, applications processor and this has got you know, an arm uh, core running in it with a whole bunch of stuff. It's got, you know, high-end uh, ADC and DAC and all you know, ethernet, thigh, and all sorts of stuff designed as sort of a one chip solution for everything.

but I guess you know they uh, optimized uh, the cost of this thing I guess maybe the black fin DSP was more expensive, but I guess they figured you know that's all they needed to run this thing I mean it doesn't have to do any heavy DSP it's just driving and a graphical LCD and reading a keypad and doing some you know, serial and maybe some ethernet is probably the hardest thing this thing's got to do. really, so you know? I guess they optimized that down I I Found that a bit surprising anyway. and uh, obviously the uh JTAG header for that one is up the top here. but look at the look at the flux residue left from the hand soldering process there of these connectors.

oh I don't like that at all. They spoiled the thing and otherwise it's you know the Reflow uh soldering quality is very good and once again, another couple of uh, hand solder connectors down the bottom. very sloppy. They haven't bothered to clean it up.

Quite disappointing, don't really expect that from Rle and the other device is actually an 8051 processor. There we go. So we've seen a similar sort of thing. uh, before in terms of uh, we've got stuff like land clock and things like that.

so maybe that's just a small processor to control the land. But maybe this other connector here is just a um, well, it could be the programming interface for that 8051, but it could also be a Serial monitor. uh, you know, debug type thing. Maybe where they actually you know program the uh flash memory and handles all that sort of stuff.

and uh, programs. The OS allows you to get all sorts of debug information out and stuff like that. and in there we have a wind. Bond SPI flash memory tucked away.

so what that one's holding I don't know your guess is as good as mine. And of course, the good thing about these application. uh, processors. They always have their own or usually have their own power management built in so you can see it's got its own, uh, you know, part of the die over here is all dedicated to, uh, the switching.

uh, circuitry for its own core. So it's got all the switching built in and you just just need a couple of you know, externally inductors and caps which can sometimes be bigger than the entire bloody processor itself. and uh, that one handles all its own power. So let's power her up and see if she still works.

shall we? will? the Magic Smoke Escape Hope I Put everything back Woohoo! Looks good. It's booting Fantastic! So there you go. That was the Ry Gold DP 832 832a uh bench power supply and uh, yes, it is. Looks like it's an absolutely identical model to the 832a.

You just pay for the software options, but that's uh, not very surprising at all. That's what pretty much everyone expected. and uh, the design and uh, build quality is not bad at all. Yes, I am disappointed with the shazzy with uh, some rust on there and also, you know, just a little bit of sloppiness here and there.

Um, in terms of that, but yeah, I know a lot of people complain. Oh, it's just as as the signant. well bloody compare the two, it's not. This one is the uh.

finish and polish in this one is much better than the signal. The signant was absolutely shocking compared to this one. Still, so yeah, there was a bit of edge rust there, but really, that's where it was, uh, confined to just those, uh, laser, um, trimmed edges on the, uh, exposed parts of the metal work there. But you know, not nearly as bad as the sign.

Not even close. A lot of people said, you know there was nothing wrong with the signant one either. So eh, make up your own mind, make up your own opinion. But I think this thing is designed and built pretty well I Love the big uh toid uh Transformer in there.

very nice indeed. and uh, the jewal board uh, construction and is rather nice. And yes, it's probably um, you know you can experiment and hack around. You could even, uh, get access to those easily get access to those external sense terminals.

So if you wanted to, really, you know, hack a connector on the uh back panel or something something like that for external uh sensing I Can't see why you wouldn't do that. It's well, those sense inputs are well protected as well. They got the MS on there and uh, yeah, it's not too bad at all. So there you go.

It's a rug old Dp832 S832, a power supply. Hope you enjoyed it. If you want to discuss it, jump on over to the EV blog Forum Catch you next time. Oh, and by the way, the uh, highres uh, photos of this thing will always be available on my flicker account.

In fact, a lot of the tear down photos are often available on my flicker account before I even upload the video. So there you go bye.