Excellent Build Quality Inside The UNI-T UDP3305S | Voltlog

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Checkout ourpcb.com for a special offer $1 for 5 PCB assemblies!⚡ I opened the UNI-T UDP3305S in this follow-up to my review video! If you've ever wondered what makes this power supply tick, this video is for you. Join me for a deep dive into the build quality, components, and design choices. Is it all sunshine and rainbows inside? Find out now! #electronics #teardown #power supply
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→Datasheet PDF
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→Timeline
00:05 Disassembly
01:52 Inside the unit
05:16 Power board
06:26 IO board
08:21 Analog/Control
10:46 Front panel & MCU
12:01 Analog/Control
13:56 Final thoughts

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Опубликовано:

15 апр 2024

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Комментарии : 41

@voltlog Месяц назад

P.S. Let me know what power supply ⚡YOU use and how it compares in the comments below! Don't forget to checkout ourpcb.com for a special offer $1 for 5 PCB assemblies!

@dreamcat4 Месяц назад

i have... this same exact psu! and it compares pretty well against the previous 1 channel of rd dph3205 which it replaces. my recommendation is simply to buy a 2nd one. and have 2. this is wise because while it is cheap and available. and currently in production. and while nobody has cottoned on to them yet.... see china has in past undergone some wider policies of iterative cost reductions. so future psu may be either more expensive (due to global inflation). or... could become unavailable. or just they replace with inferior version. so for common sense, if can afford 2x of these psu... then get 2x. because there is nothing more to improve or wish for here. it's basically perfect

@drescherjm Месяц назад

I am using a KORAD ka300sp + supply off my Yihua 853D 3A when needed.

@m80116 Месяц назад

If I had the budget I would have bought this one. So far I've got a DMM, DSO and a SIG-GEN from Uni-T. I've tried other budget brands but they are not in the same league especially in the build quality and supplied accessories. So for me this product doesn't come as a surprise ad I might even buy it eventually. Thanks for your detailed review and disassembly video.

@voltlog Месяц назад

Awesome, thanks for the feedback!

@drescherjm Месяц назад

Something about toroidal transformers gets me to smile. I really like the clean looks of the internals of this supply.

@voltlog Месяц назад

Yup, I have the same feeling when seeing something that's built for quality.

@modorangeorge4991 Месяц назад

What capacity it has on the outputs ? You seem to ignore that very important aspect. I assume is at least 100uF, enough to destroy sensitive circuitry on constant current mode.

@jaro6985 Месяц назад

Looks to be in the 300-800uF range, which is typical for this style and price of PSU. If you want a more sensitive PSU you need to specifically buy a "high speed" power supply. Some of those will let you also select a low capacitance mode/high speed mode (

@GeorgePapadopoulos11 Месяц назад

I have it and I’m very happy with it.

@voltlog Месяц назад

Great to hear! thank you for the feedback!

@964tractorboy Месяц назад

The standard of internal construction belies its modest price. However, I'd like to see a little more spent on the industrial design of the front-panel. That's my only "issue".

@voltlog Месяц назад

I would like to better understand what you would improve because for me it's perfectly functional as it is, doesn't get in my way, gets the job done. But maybe I am subjective because they gave me a free unit, still I would like to understand what other people would improve on the front-panel. I look for example at a Rode&Schwarz which costs 10x as much so surely they invested more on the industrial design and although it has a different arrangement, it's still the same idea, banana jacks bottom side, keypad + rotary encoder, some dedicated buttons, I don't see any major difference. I look at R&S metal/plastic construction in a teardown from @eevblog, I see no major difference, very similar bent metal sheet frame, very similar plastic on the front panel, where is that higher quality construction that some people mention here in the comments?

@IanScottJohnston Месяц назад

Very nice PSU......inside and out.

@voltlog Месяц назад

Thank you for your feedback Ian!

@Runco990 Месяц назад

I had a triple output power supply that had a MASSIVE heatsink on the back and was totally silent. Today everything has the smallest heatsink and noisy fans. I wish I had NEVER sold the old PSU, it's virtually impossible to find one now. I don't care how well something is built, when it's annoying and noisy on the bench.

@voltlog Месяц назад

This UNI-T PSU is the quietest instrument out everything I have with a cooling fan! That has to count for something considering a linear PSU has to drop voltage.

@Runco990 Месяц назад

@@voltlog That's good to "hear". Yes, the old bench supply I had, worked with relays as well, dropping only a small voltage across the transistors, but needed no fan. I do audio repairs, alignments and restorations, so the last thing I want to hear is test equipment over what I'm working on. My current supply I modded with a Noctua fan and ran it under full load to test. It is now quiet enough but works as intended.

@0x2102 Месяц назад

I have the same PSU (3305S). Overall I like it. What I don't like is the fan noise, even at idle it is annoying. It even ramps up from there in certain situations. Don't know if it's normal but with certain test loads 8V / 6A (48W output) it is drawing 230W from the wall. Seems very inefficient and the heatsink seems to be too small to handle the heat for a long time.

@johnwayne8114 Месяц назад

Salut, foarte bun review :). Ai mai avea o recomandare si pentru surse de buget dar bine facute si fara prea mult noise? Acum ceva vreme recomandai sursele Gophert, dar ma mir daca a mai aparut ceva intre timp.

@yunodiewtf Месяц назад

I use a couple DPS5020s and a soviet-era linear boi. YOLO.

@steubens7 Месяц назад

wire directly into the front panel board is a bit sketch, hopefully it stays quiet for a long time & vibration won't wiggle those floppy boys too much

@voltlog Месяц назад

Nothing sketchy with the wiring in there, it's all assembled flawlessly. But maybe you meant the TO220s? yeah those are not mechanically secured to anything so theoretically if you would drop the PSU from a couple of meters height to a hard surface they will suffer but at that point I think you have other more important problems on your hands.

@stevenbliss989 Месяц назад

For such a hi quality and expensive design, it is a pity they used the cheap and crappy OP-07C op amps in the feedback loop (for the current reg I assume). WTF?????

@sanjikaneki6226 Месяц назад

there are a lot of cables inside , dont they create EMC problems?

@voltlog Месяц назад

All of those cables are packed inside a metal chassis tied to mains earth.

@sebastian_harnisch Месяц назад

Seems like a decent power supply. I’m fairly impressed by the build quality, but I think the plastics and the whole design still looks a bit cheap when compared to HP/Agilent/Keysight/R&S products. They should reduce the number of different button shapes and even more importantly angles. Some of these changes wouldn’t cost too much money if at all, but would make it look much more professional. They might have tried to copy Rigol to some extent, but from a design point of view this would be a huge mistake imo.

@voltlog Месяц назад

IMHO I think they did a much better job than Rigol with the front panel and GUI.. When you say it looks a bit cheap, maybe it's from a certain design perspective that you have? Cause in practice, actually taking a look at it on my workbench and taking it apart, there is nothing that feels cheap. Metal, plastic, it's all very nicely manufactured.

@aneeshprasobhan Месяц назад

of course, but the R&S is overpriced as hell compared to this one.

@sebastian_harnisch Месяц назад

@@aneeshprasobhan my point was: they could have easily made it look even more professionally, likely without introducing much cost. They decided not to, unfortunately. I just don’t get it. That was my whole point… Whether Keysight, R&S gear is overpriced is another topic and has little to do with that. It’s certainly much more expensive and most DIY applications don’t allow for a 1.5 to 3k power supply. That’s why many people buy either the cheaper (e. g. Uni-T) and/or used equipment - like myself.

@stevenbliss989 Месяц назад

Just BEND AWAY the offending linear reg next to the caps!

@voltlog Месяц назад

And bend away I did!

@DoTheDiy Месяц назад

naa i still love and prefer my Rigol DP832 which i unlocked to DP832A. It supports LXI . This UNI looks a clone of that model

@voltlog Месяц назад

Okay, I'm glad you're happy with the DP832, thanks for the feedback!

@jaro6985 Месяц назад

I have the DP832 and DP932, and this functionality wise looks to be a better PSU. Especially how it handles the parallel outputs. But, this unit costs more than what I paid for Rigol, so, not that surprising. The uni-t accepts SCPI over ethernet, essentially that is the same as saying LXI.

@niemusze5078 19 дней назад

You ar spanish, right?

@Tech-Relief Месяц назад

Too expensive I would pay $369 for it but they want 364 for shipping, that's crazy $734 total.. I think I can find a linear supply cheaper than that...

@voltlog Месяц назад

There is something wrong there if you're paying $364 for shipping. I don't think "they" as in "UNI-T" want $364 for shipping. In the EU for example you can often get this PSU with free shipping and a discount on top of that list price.

@Tech-Relief Месяц назад

@@voltlog Yes that is what it says... It is over $500 on Amazon aswell..

@voltlog Месяц назад

@@Tech-Relief I would suggest contacting your local UNI-T rep, I'm sure they will be willing to give a good price and affordable shipping cost.

@Tech-Relief Месяц назад

@@voltlog I do not have a UNI-T rep. I went to the UNI-T store on AliExpress and this is what they said: Sorry, ,this product is heavy and the shipping fee is really so high. So $600 to $730 is just too much. I think RIGOL and SIGLENT have equivalent power supplies that can be had cheaper...