New Fnirsi DPS-150 mini lab power supply (30 V, 5 A, USB PD powered) - Page 1
Forum section: electronics / testgear

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: September 02, 2024, 04:07:12 am
content: Anyone tried this yet? DPS-150,available from Fnirsi's store on AliExpress(currently on special for USD $55) but not listed on Fnirsi's site and I couldn't find any reviews of it yet.Seems comparable to the DP100 but with a pop-up display that could be useful:

author: DaneLaw
author_rank: Frequent Contributor
timestamp: September 06, 2024, 04:05:08 pm
content: Give it some weeks.Fnirsi tends to lubricate most of YT's tech-influencers with Fnirsi's en'masse, so there will likely be dozen videos of DPS-150 in a few weeks, and hopefully at least one of them' takes it for a ride.Fnirsi's product is a hit or miss, some of them are surprisingly decent with the price in mind, while others are dancing on a fine line of being close to defect.Quite sparse with info on the promo-listings, its the same Fnirsi spec-limbo (low noise) without any tolerances... PD support, without any specs for what power delivery standard it carries.. One could hope with. its 150W rating, its PD3.1 from its TypeC as a lot of products & powerbanks are getting PD3.1 support (28v 5A) at significantly lower prices than previously, but the mixed barrel DC + Type makes it easy to use of-the-shelf PD3.1 triggers.The manualhttps://www.fnirsi.com/cdn/shop/files/DPS-150_Manual.pdf

author: 2vlado
author_rank: Newbie
timestamp: November 10, 2024, 11:52:16 pm
content: Those banana jacks don't appear to be 19mm apart

author: DaneLaw
author_rank: Frequent Contributor
timestamp: November 11, 2024, 11:46:36 pm
content: Quote from: 2vlado on November 10, 2024, 11:52:16 pmThey sadly ain't, I reckon the DP100 from Puntual Atomic (Alientek) is the standard dimensions, as Dave (EEVblog) seemed to use BNC adapters in his vid.

author: jwr
author_rank: Contributor
timestamp: December 02, 2024, 08:45:45 pm
content: I just got one of these. I didn't expect much from it, but either I got a defective unit (no output cap?) or something is really wrong. The ON state is much more noisy than I expected (>750mV peak to peak at 5V!), but the OFF state… not everything will survive negative 6V.Does anybody else see that?

author: Aldo22
author_rank: Super Contributor
timestamp: December 02, 2024, 09:06:33 pm
content: It also depends on the source.I see some noise too, but not as much as you do.https://www.eevblog.com/forum/testgear/new-miniature-programmable-dc-power-supply-fnirsi-dps-150/msg5680887/#msg5680887https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5680719/#msg5680719

author: jwr
author_rank: Contributor
timestamp: December 02, 2024, 10:05:21 pm
content: Hmm, interesting… none of these other images show the behavior I'm seeing: negative voltage when the PSU is OFF. That's what I'm most concerned with, although a ripple of >750mV peak to peak at 5V output is pretty concerning, too. Perhaps I got a faulty unit after all?(I tried with two different USB-PD power adapters, one from Anker and one from Ugreen, but that shouldn't matter — I might expect a little more HF noise with a crappy adapter, but not negative 6V)

author: Aldo22
author_rank: Super Contributor
timestamp: December 02, 2024, 11:22:17 pm
content: Quote from: jwr on December 02, 2024, 10:05:21 pmPossible. I have never seen these negative voltages on my device.Please use the main DPS-150 thread for further posts, otherwise the information will become cluttered.https://www.eevblog.com/forum/testgear/new-miniature-programmable-dc-power-supply-fnirsi-dps-150/

author: TheDefpom
author_rank: Frequent Contributor
timestamp: December 03, 2024, 07:36:31 am
content: I reviewed this unit a couple of months ago, in case it is of help.

author: jwr
author_rank: Contributor
timestamp: December 03, 2024, 10:38:15 am
content: Yes, I watched that video — the startup behavior and noise you were seeing are about what I would expect from this device. Your video doesn't show no-load behavior in the OFF state, but judging from the startup capture, you don't get negative voltages there.My startup into with a 6k8 load connected looks like this:

author: DaneLaw
author_rank: Frequent Contributor
timestamp: December 04, 2024, 01:30:08 am
content: Quote from: jwr on December 02, 2024, 10:05:21 pmTry with a clean battery source.just to rule out, your DC source, as some of these fast charge handshake protocols, can get a little confused, but it obviously shouldn't to the extent your witnessing.

author: Aldo22
author_rank: Super Contributor
timestamp: December 04, 2024, 06:30:39 pm
content: Quote from: jwr on December 02, 2024, 10:05:21 pmI tried it again with a 45W PD Charger.I see the same thing as you with this one.I probably hadn't noticed because it had a 50 Ohm load resistor.The negative voltage disappears with the LR. It is about 0.13mA ACNormally I use the linear power supply as the source for the DPS-150, when I work with the oscilloscope.You don't see any major problems with this one either, just a small ripple that disappears after switching on.I think your device is fine.

author: Dexter2
author_rank: Contributor
timestamp: July 12, 2025, 09:40:35 am
content: From the oscilloscope images below this power supply has the same problem as the DP100 unit. The problem is this units disconnect the negative terminal when the output is off. So when you have a grounded device as an oscilloscope you lose your ground connection and therefore this spikes.You can see more and a solution for this problem in my answers in the DP100 post.https://www.eevblog.com/forum/testgear/dp100-mini-power-supply-(0-30v-0-5a)/

author: watchmaker
author_rank: Unknown
timestamp: July 13, 2025, 12:14:09 pm
content: Quote from: Dexter2 on July 12, 2025, 09:40:35 amWill your board fit in the DP-150?? Thanks!

author: geonicz
author_rank: Contributor
timestamp: August 14, 2025, 04:11:31 pm
content: Mine unit got dead just after regular plugging typeC power in. Nothing special, nothing criminal, just bricked without any reason. Bricked firmware without any ability to update or restore. Fnirsi's support is a useless waste of time.Got two alientek's dp100 working nice(Dave reviewed it). As this is not the first time I get in trouble with this 'proffesional equipment' I'd avoid this 'company' forever.

author: Aldo22
author_rank: Super Contributor
timestamp: August 14, 2025, 04:45:28 pm
content: Quote from: geonicz on August 14, 2025, 04:11:31 pmHow did you manage that?I've fed mine with all kinds of sources and never had a problem.- 45W PD charger- 65W PD charger- 300W PSU- Homemade linear PSU- 12V battery pack.- 5V power banketc.It swallowed everything without complaint.I would really miss the DPS-150.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: August 14, 2025, 05:09:45 pm
content: My unit is also working fine..Though have in mind the tiny button on the back where you select between PD and DC, it can act like a hardlock off-button (if I recall correctly) if it's been flipped into the wrong position.Lately been runnning it from.

author: geonicz
author_rank: Contributor
timestamp: August 15, 2025, 03:59:01 am
content: I really don't know howThats sounds stupid but I used it the regular way via USB-C. USB PD adapter, nothing special. I use the same PD power adapter for at least threee devices more than a year now with no complains(Macbook/PC, two Alientek pd100 PSUs). But fnirsi one died upon plugging in same adapter. Died irreversibly because it was not a hardware fault but firmware fault.So all I had after regular plug-in is a brick with their shitty boot logo and a heap of nonscence from their shitty suport.buying fnirsi = wasting money

author: Aldo22
author_rank: Super Contributor
timestamp: August 15, 2025, 06:28:18 am
content: @geoniczOK, I'm sorry for you.But maybe you were just unlucky and had the wrong expectations?I'm not saying that Fnirsi products are high quality, but so far everything I've bought from Fnirsi has worked.But none of the devices cost more than €50 and to be honest, if something breaks now, I wouldn't even think of contacting support. I don't expect anything and it would be too much of a hassle.

author: geonicz
author_rank: Contributor
timestamp: August 15, 2025, 12:33:24 pm
content: Thanks for your sympathy. It's always unpleasant when one's expectations meet reality in a bad wayWell, I have to insist that I wasn't unlucky and my expectations were, hm, expected!I wanted a power supply which supplies power, I wanted temperature controlled hot air gun which heats at reasonably controlled temperature and a scope which displays voltage within reasonable voltage tolerance. That's not something special. I may call it "reasonable expectation"If somebody sells a product which claims to heat why should it fly and whistle?I'd say, it doesn't really matter how much it costs at this point. Low price is not an excuse for faulty crap(who decides which is low or high, though).And noone will argue that fnirsi got one of the juiciest marketing bullshit on the electronics market.So quickly mentioning other devices malfuctioned, I'd say there's something suspicous with this company...

author: Aldo22
author_rank: Super Contributor
timestamp: August 15, 2025, 02:52:40 pm
content: @geoniczWell, you're kind of on a crusade against Fnirsi.Sure, they produce some junk, but I'm actually quite happy with my Fnirsitoys.They're all still working and are up to 4 years old.I really don't think your case is typical.If you want more reliability and support, you have to pay more. It's as simple as that.

author: geonicz
author_rank: Contributor
timestamp: August 15, 2025, 11:30:59 pm
content: Yep, have to admit my crusadeThe overall experience(mine) with their devices and support made me look at them more attentively.It's interesting how many people use their devices and have no troubles with them at all vs faulty ones. Percents.Mine is 1(working)/4(total), 25%