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!
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
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.
The best deal I could find in Canada for the UDP3305S was $662ca+Taxes (ITM). This is a birthday present I made to myself! 😁 My old Lambda 40V 10A I bought used in the 80's still work well but a new workbench need new tools! 😏
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.
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 (
It looks much more modern compared to what I have here, in fact, I would like to buy PSU like this, maybe someday in the future. I need to spend money on different equipment than replacing my aging bench PSUs, which are AUL210 made in 1984 by ZPA Košíře and PS2 made by JZD Mír Březůvky in 1981. AUL210 has two independent 0-36V/2A outputs, two fixed voltage 15V/1A outputs and one 5V/2A, so you can get 107V/1A if you put all of them in series. Fixed voltage outputs are just linear regulators with overcurrent protection, 0-36V output has kind of switching mode preregulation based on phase controlled thyristor switching (which makes horrible buzzing sound) followed by linear regulator with current limiting. That thing looks like it didn't come from this world, which results in mystical feeling every time I turn that thing on, knowing that it could explode for no reason opening portal to /dev/null, Cthulhu, or something even worse. In fact, it's horrible PSU, but (for some unknown reason) I completely love it. The second one (PS2 by JZD Mír Březůvky) is much more convenient, it looks like PSU. It's 0-30V/0-3A and it's proper switching mode power supply (as a preregulation) followed by linear regulator (yes, made in 1981) and that thing works well. And, of course, I have two modern cheap switching mode Chinese PSUs (Riden and Hanmatek), but there is nothing exciting on them, they are just high power SM PSUs with a lot of noise and ripple on their outputs.
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".
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?
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.
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.
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.
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.
@@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.
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.
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.
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 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.
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?????
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.
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...
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.
@@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...
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!
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
I am using a KORAD ka300sp + supply off my Yihua 853D 3A when needed.
I have it and I’m very happy with it.
Great to hear! thank you for the feedback!
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.
Awesome, thanks for the feedback!
Something about toroidal transformers gets me to smile. I really like the clean looks of the internals of this supply.
Yup, I have the same feeling when seeing something that's built for quality.
Very nice PSU......inside and out.
Thank you for your feedback Ian!
The best deal I could find in Canada for the UDP3305S was $662ca+Taxes (ITM). This is a birthday present I made to myself! 😁 My old Lambda 40V 10A I bought used in the 80's still work well but a new workbench need new tools! 😏
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.
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 (
It looks much more modern compared to what I have here, in fact, I would like to buy PSU like this, maybe someday in the future. I need to spend money on different equipment than replacing my aging bench PSUs, which are AUL210 made in 1984 by ZPA Košíře and PS2 made by JZD Mír Březůvky in 1981. AUL210 has two independent 0-36V/2A outputs, two fixed voltage 15V/1A outputs and one 5V/2A, so you can get 107V/1A if you put all of them in series. Fixed voltage outputs are just linear regulators with overcurrent protection, 0-36V output has kind of switching mode preregulation based on phase controlled thyristor switching (which makes horrible buzzing sound) followed by linear regulator with current limiting. That thing looks like it didn't come from this world, which results in mystical feeling every time I turn that thing on, knowing that it could explode for no reason opening portal to /dev/null, Cthulhu, or something even worse. In fact, it's horrible PSU, but (for some unknown reason) I completely love it. The second one (PS2 by JZD Mír Březůvky) is much more convenient, it looks like PSU. It's 0-30V/0-3A and it's proper switching mode power supply (as a preregulation) followed by linear regulator (yes, made in 1981) and that thing works well. And, of course, I have two modern cheap switching mode Chinese PSUs (Riden and Hanmatek), but there is nothing exciting on them, they are just high power SM PSUs with a lot of noise and ripple on their outputs.
Loved your story and description of the classic gear you own!
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".
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?
would you replace OP-07C from feedback loop with something more hugh end?
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.
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.
I use a couple DPS5020s and a soviet-era linear boi. YOLO.
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.
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.
@@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.
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
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.
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.
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.
of course, but the R&S is overpriced as hell compared to this one.
@@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.
there are a lot of cables inside , dont they create EMC problems?
All of those cables are packed inside a metal chassis tied to mains earth.
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?????
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
Okay, I'm glad you're happy with the DP832, thanks for the feedback!
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.
Just BEND AWAY the offending linear reg next to the caps!
And bend away I did!
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...
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.
@@voltlog Yes that is what it says... It is over $500 on Amazon aswell..
@@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.
@@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...
You ar spanish, right?