New miniature programmable DC power supply - FNIRSI DPS-150 - Page 1
Forum section: electronics / testgear

author: LeonR
author_rank: Regular Contributor
timestamp: September 04, 2024, 04:28:46 am
content: https://www.aliexpress.com/item/1005007614877705.htmlFeatures:1. Model：DPS-1502. Input Voltage：DC5.0V~32V3. Input Current：100mA~5A4. Input Way 1：PD fast charger5. Input Way 2：QC fast charger6. Input Way 3：Power bank7. Input Way 4：DC power adapters8. Output Voltage：0~30V9. Output Current：0~5A10. Output Power：0~150W11. Operating Environment：0℃~40℃12. Load Regulation：0.49%13. Full Load Efficiency：96.30%14. Screen：2.8 Inch (320*240)15. Weight：about 178g16. Dimensions：106×76×28mm17. Overvoltage Protection：support18. Overcurrent Protection：support19. Undervoltage Protection：support20. Overpower Protection：support21. Overtemperature Protection：support22. Reverse Input Protection：support23. Reverse Output Protection：support24. Short Circuit Protection：support25. Firmware upgrade: supportSeems like the Alientek DP100 have a potential competitor now.

author: sonpul
author_rank: Regular Contributor
timestamp: September 04, 2024, 10:18:33 am
content: A review with photos has been released. Many will need a translator.FNIRSI DPS-150 adjustable DC-DC converter with rotary screen

author: Fungus
author_rank: Super Contributor
timestamp: September 04, 2024, 12:37:39 pm
content: Nice!

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 06, 2024, 01:54:01 pm
content: I'm taking a chance and ordered one of these. FNIRSI usually has good hardware but the software is horrendous.I seem to have a habit of purchasing these mini products. I don't know why.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: September 06, 2024, 03:22:22 pm
content: I have a strong dislike for fnirsi stuff. The boxes they make look nice and appealing, and so are their prices, but the rest is such a pile of garbare that you're better off buying some decent stuff.A lot of reviewers tend to disregard the faults in the fnirsi stuff (they get more stuff for free if they make positive reviews). The problem with this fnirsi stuff is that it is marketed towards beginners, and those are also the most likely to get confused by the flaws in this fnisi stuff. I thin their scope is not even capable of single shot mode. It always does some weird averaging, which is clearly visible when you for example change the timebase or voltage setting. Try to catch a glitch with that. And yet, reviewers still give it a positive review because it is capable of showing a sinewave at half the claimed bandwith of the instrument.And what does text on the back mean:"PD and DC transposons Cannot Be Inserted Simultaneously"I guess it means that all the smoke is released if you put two plugs in this gadget.A part of the appeal of a power supply like this is it's compact size and portability, and it can be powered from a power bank, but I guess the big LCD would suck the batteries dry quite quickly.This thing is clearly an "improved" copy of the Alientek DP100 (Dave made a review about that). That is a quite nice powersupply and also relatively low noise for an SMPS. (I think even Marco Reps likes that one).While having a short peek at youtube, I got a video from Matthias Wandel, and he also gives the fnirsi scope a thumbsdown. He says this advertised as 100MHz scope is "sort of usable" up to around 20MHz or so, and that is apart from it's other flaws such as horrible aliasing.Maybe fnirsy will stop lying about it's specifications, and either tune down the specifications, or make the hardware and software better, but if they ever do that, I guess that will be 5 to 10 years into the future.For the short term it's much better to save up some money and buy something that at least matches it's advertised specifications.

author: ha_embedded
author_rank: Contributor
timestamp: September 13, 2024, 12:57:23 pm
content: Unclear specs, Datasheet says max. 32V, marking on product says max. 20v. And the PD-input, curious to know if they support PD3.1 for 28V. Probably not, would be very nice for 24V products.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 04:38:07 pm
content: I received one a few days ago and my initial impression is positive.It appears well made and works like a power supply should.My only minor gripe is of course the spacing of the banana jacks. It's not the typical spacing for the dual banana plugs.The screen is nice and tilt function comes in handy for different viewing angles.So far, I have only tried the USB C PD connection which seems to max out at 20V input. The DC barrel jack can apparently go to 30V but I have yet to try it.

author: Evi
author_rank: Regular Contributor
timestamp: September 21, 2024, 05:01:42 pm
content: Uout >=5VShame!!!

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 05:13:38 pm
content: Quote from: Evi on September 21, 2024, 05:01:42 pmI don't know what Uout is. Do you mean Vout?If so, the device goes from 0V to 30V.

author: Evi
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:04:18 pm
content: Try to obtain 0<Vout <5V.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:13:26 pm
content: Quote from: Evi on September 21, 2024, 06:04:18 pmMust be a language barrier as I don't know what you are trying to say.

author: Evi
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:28:57 pm
content: Obviously...Understand?

author: Aldo22
author_rank: Super Contributor
timestamp: September 21, 2024, 06:30:11 pm
content: Does it produce (a lot of) noise/ripple itself or does that just depend on the quality of the input?

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:43:01 pm
content: Quote from: Evi on September 21, 2024, 06:28:57 pmNo, not obviously. Perhaps you have no idea what you are talking about. Just saying.Instead of being an arse, how about trying to explain yourself better?

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 06:48:00 pm
content: Quote from: Aldo22 on September 21, 2024, 06:30:11 pmI have not done any noise/ripple tests yet. I just received it. I have not even tried the barrel jack yet.Hopefully in a few days I will have time to test for noise/ripple.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 07:26:18 pm
content: Quote from: Aldo22 on September 21, 2024, 06:30:11 pmOkay, I did a very quick check for ripple using the usb C input. I'm using a relatively cheap Amazon Basics 100W USB wall charger.Under load, the ripple is negligible. I used a 1A load and varied the voltage from 1V to 20V.I also compared it with the ripple from the output of my Rigol DP832 power supply and I couldn't see any difference.But as you stated, it might depend on the quality of the source.

author: Fungus
author_rank: Super Contributor
timestamp: September 21, 2024, 10:16:50 pm
content: Quote from: 4thDoctorWhoFan on September 21, 2024, 07:26:18 pmNah, the voltage will go through all sorts of inductors/capacitors on the way to the ouput. Your source would have toseriouslymessed up to make a noticeable difference.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 10:25:58 pm
content: Quote from: Fungus on September 21, 2024, 10:16:50 pmWell, there you go.If source does not matter, then ripple is not a concern.

author: Fungus
author_rank: Super Contributor
timestamp: September 21, 2024, 11:34:34 pm
content: I'm seriously thinking of getting one...

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 21, 2024, 11:46:27 pm
content: Quote from: Fungus on September 21, 2024, 11:34:34 pmYou should get one. They are cheap enough.Personally, I like the flip screen. I also have the miniware power supply and while it's well built, the LCD screen is very small.

author: Fungus
author_rank: Super Contributor
timestamp: September 22, 2024, 08:17:50 pm
content: What's the max input? In the picture it shows "20V" but the specs say "32V".I've got a few 24V supplies here that could run it but nothing much between 12 and 24.

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 24, 2024, 08:32:29 pm
content: Quote from: Fungus on September 22, 2024, 08:17:50 pmThe manual says 5-32V. Printed on the back of the device itself above the barrel jack it says 5-32V.I have yet to use the barrel jack as so far I have only powered it via USB-C.

author: Fungus
author_rank: Super Contributor
timestamp: September 24, 2024, 08:50:03 pm
content: Quote from: 4thDoctorWhoFan on September 24, 2024, 08:32:29 pmOK, thanks.I have a feeling these are 3D renders, not reality:

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 24, 2024, 09:08:04 pm
content: Quote from: Fungus on September 24, 2024, 08:50:03 pmYes, you are probably correct.Just like the 3D render of their new transistor tester that had the wrong NPN/PNP displayed. LOL

author: Fungus
author_rank: Super Contributor
timestamp: September 24, 2024, 11:01:45 pm
content: Quote from: 4thDoctorWhoFan on September 24, 2024, 08:32:29 pmDid you get the one with the official USB adapter?

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 25, 2024, 10:05:35 am
content: Quote from: Fungus on September 24, 2024, 11:01:45 pmNo, I purchased the power supply only.I already have around 4 USB adapters that are more than sufficient.

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 10:08:19 am
content: Do I understand correctly that it is not a step-up converter?That is, the highest output voltage is equal to the input voltage?On mysku there is a picture of the ripple/noise which doesn't look very good.200mVpp is a lot.Was it measured wrong, or how come?Fnirsi says "<20mV ripple to protect sensitive electronics". But what's that? Vpp/Vrms?

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: September 25, 2024, 11:03:47 am
content: Quote from: Aldo22 on September 25, 2024, 10:08:19 amI don't know what to tell you. To many unknowns about what you posted.All I know is that I don't have those sort of results.

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 11:17:31 am
content: Quote from: 4thDoctorWhoFan on September 25, 2024, 11:03:47 amOK, but the first question is easy.If your voltage source supplies e.g. 12V, can this device supply e.g. 20V or only 12V or less?The other question relates to the review here:https://mysku-club.translate.goog/blog/aliexpress/101049.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wappThank you!

author: ArdWar
author_rank: Frequent Contributor
timestamp: September 25, 2024, 01:49:25 pm
content: Reading the manual (lol), this is buck only.I'm also not sure which "reverse output protection" they're advertising. Likely just voltage since they still warn user to use protection diode if there's possibility of inadvertent quadrant 2 operation.

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 02:28:29 pm
content: Quote from: ArdWar on September 25, 2024, 01:49:25 pmOK, thank you!Congratulations on your666th post.

author: Fungus
author_rank: Super Contributor
timestamp: September 25, 2024, 02:35:57 pm
content: Quote from: Aldo22 on September 25, 2024, 10:08:19 amYes, that's correct.Input voltage must be higher than output voltage.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 25, 2024, 02:40:58 pm
content: Quote from: Aldo22 on September 25, 2024, 10:08:19 amTry to power the device from battery source and then take measures 200+mV are excessively high. I had one and the ripple values were around 28mv from battery source.And if you supply it with 30V you won't get 30V at output mine did 28.6VI return it because I work with higher voltages

author: Fungus
author_rank: Super Contributor
timestamp: September 25, 2024, 02:43:48 pm
content: Quote from: Aldo22 on September 25, 2024, 10:08:19 amRipple is periodic, you're looking at "noise".At 20uS/div? I wouldn't like to say where that's coming from but the PSU should have a big capacitor across the output so it seems unlikely to be the PSU per se. Try switching some other things off.

author: Fungus
author_rank: Super Contributor
timestamp: September 25, 2024, 02:48:08 pm
content: Quote from: ptluis on September 25, 2024, 02:40:58 pm

author: ptluis
author_rank: Frequent Contributor
timestamp: September 25, 2024, 02:52:11 pm
content: Quote from: Fungus on September 25, 2024, 02:48:08 pmI'm referring to ripple not noise. I didn't have any noise contamination when I did the test, I also source the device from battery pack

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 02:52:57 pm
content: Quote from: ptluis on September 25, 2024, 02:40:58 pmThank you.I don't have one (yet), I was just wondering if I should buy one for applications where “low noise” is an issue. I already have a "high noise" PSU.Not completely convinced yet as it obviously depends on the quality of the input.Step-up converterwould have been nice too.

author: Evi
author_rank: Regular Contributor
timestamp: September 25, 2024, 02:54:33 pm
content: New-Newhttps://banggood.com/DPS100-DC-Power-Supply-2_4-inch-HD-Screen-100W-Output-Type-C-DC-Input-Adjustable-Voltage-and-Current-10-Preset-Outputs-p-2021225.html?

author: ptluis
author_rank: Frequent Contributor
timestamp: September 25, 2024, 03:12:40 pm
content: Quote from: Aldo22 on September 25, 2024, 02:52:57 pmFor low noise I always use battery as source and in cases were sensors with output up to 100mV always use battery as source without using smps or dc-dc converters only analog.For lower voltage DUT you should always choose a ps that allow you to source it from battery pack , that's why I'm converting all my equipment to portable including Scopes, sig gen, etc, etcYou save alot of headache's

author: ArdWar
author_rank: Frequent Contributor
timestamp: September 25, 2024, 03:19:13 pm
content: What topology is it anyway? I'd expect it to have linear post regulation (if only because you don't normally do constant current using switcher directly). But those reported ripple/noise performance are unconvincing...

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 05:21:14 pm
content: Quote from: ptluis on September 25, 2024, 03:12:40 pmA battery is certainly very good, but last week I made a power supply from an old Christmas tree transformer 12VA AC, 4 x 1N5399, a few capacitors and an L7812CV (without knowing what I was doing) and it is almost as "low-noise" as a battery.I was amazed.I could actually use this as an input for the Fnirsi.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 25, 2024, 05:42:50 pm
content: Quote from: Aldo22 on September 25, 2024, 05:21:14 pmThat's a nice way to learn and build a PS, with a decent heatsink that 7812 is able to supply 1A without any problem, with low ripple. The spikes I see I bet they come from your scope PS

author: Aldo22
author_rank: Super Contributor
timestamp: September 25, 2024, 06:16:02 pm
content: Quote from: ptluis on September 25, 2024, 05:42:50 pmI don't know where they come from. They are "in the air".I see a similar amount of noise even when I measure the battery pack.In any case, this home-made PSU has almost no high-frequency noise.EDIT: When I measure with the probes, I hardly see any spikes. The BNC cable shows much more noise.

author: Fungus
author_rank: Super Contributor
timestamp: September 26, 2024, 01:59:16 am
content: What's shown here isnoise, not ripple. Noise like that doesn't normally come from a switching supply, it's external.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 26, 2024, 01:11:18 pm
content: The technique I use to measure PS ripple it's a kind of "special cable" that one side connects to the output of the power supply under test and on the other side (with the ground clip removed) I insert the probe on a soldered ground spring, the tip connects to a golden point on the pcb. 2 capacitors in parallel are added into the side where the probe connects. The two wires of this cable are twisted.Aldo22 if you want to try this, beware with the capacitors operating voltage, the higher the better for safety reasons. You don't want to connect a 16V capacitor into a 60V PSEdit: Don't forget the polarity of the 47uF electrolytic capacitor! minus connects to the black wire!This video shows how I do it:This video also shows differences in different techniques, but I prefer the previous for it's flexibility to allow connecting different outputs connectors without much effort by using this "special cable"

author: Aldo22
author_rank: Super Contributor
timestamp: September 26, 2024, 03:52:33 pm
content: @ptluis: Thank you!OK, I've plugged in the soldering iron.What do you think of this construction? (Attached picture)Since I have a probe adapter, I thought it would be easier this way.What scope settings are you measuring at?Sec/Div, BW Limiter, Acquire Method etc...

author: ptluis
author_rank: Frequent Contributor
timestamp: September 26, 2024, 04:11:26 pm
content: Quote from: Aldo22 on September 26, 2024, 03:52:33 pmDon't forget to split the cable and twist the wires, don't leave them parallel to each other. Certify that insulation is in good condition to avoid shorts.Normally I press Auto, manual only to zoom in the results or in case Auto fails to show proper resultsAC couplingEdit: if you get to much noise try the spring approach

author: Aldo22
author_rank: Super Contributor
timestamp: September 26, 2024, 04:42:00 pm
content: Quote from: ptluis on September 26, 2024, 04:11:26 pmOK, I forgot to twist the wires. It's done now.It may depend on the scope, but for me “Auto” simply sets DC to show the 12V. But I need AC with 5mV or 2mV/divIt does make a difference whether I set “Peak Detect” or “Average” etc. on the scope. Also the Sec/Div.In the attached pictures you can see my self-made PSU above and the (noisy) PDS-3010G below, both without load @12V.Settings: AC | Peak Detect | No BW-Limitation | 200us/Div | 5mV/Div.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 26, 2024, 08:47:58 pm
content: Quote from: Aldo22 on September 26, 2024, 04:42:00 pmAs you can see with the 2 capacitors and the twist cable approach you got cleaner results.Did you tried RISE instead of peak detect? I think rise will be better for manual trigger fine tuning and to analyze ripple I don't know if your scope allows manual setting 1mV/div or lower so that you get a better view of the results, but of course the lower you go the more you amplify external contamination.Btw from my understanding peak detect will be better to analyze switching spikes and not so good for ripple, the experts correct me if I'm wrong.

author: Aldo22
author_rank: Super Contributor
timestamp: September 26, 2024, 09:43:55 pm
content: Quote from: ptluis on September 26, 2024, 08:47:58 pmHiI don't know what RISE is.My cheap scope has the acq. modes: Normal - Hi-Res - Peak - Average.Thank you.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 12:16:21 am
content: Quote from: Aldo22 on September 26, 2024, 09:43:55 pmMy mistake sorry,Aquisition mode I use normal instead of peakTrigger type I use Edge and slope RiseAfter you check for ripple at no load, apply some load at output and watch the real ripple of the ps when stressed

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 08:36:17 am
content: @ptluisIt depends on whether you don't want to miss a spike (Peak detect).For ripple measurement, Hi-Res is probably the best for my scope.I'll check with load later.Thank you.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 10:24:00 am
content: Quote from: Aldo22 on September 27, 2024, 08:36:17 amWell you should try and see what option gives you the best results, but in ripple measurements were not looking for spikes. that's my 2 cets

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 10:50:32 am
content: Quote from: ptluis on September 27, 2024, 10:24:00 amI understand that this is a good way to measure ripple.But actually the higher frequency noise of my (other) SMPS bothers me even more...It's not that easy:https://www.4niev.com/switching-power-supply-noise/But in any case, my self-built PSU hasn't shown any worrying interference in any range so far.And to get back on topic, I think it would be a good source for the DPS-150 (for low power applications).

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 12:15:46 pm
content: Quote from: Aldo22 on September 27, 2024, 10:50:32 amYour self made psu operates differently from smps (switch mode power supply) so the smps always show spikes, some show higher spikes other less, depending on the quality of the filtering, with aquire mode set to peak, your calculated pk to pk value is higher meaning ripple measured will not be real.The dps-150 is a dc-dc buck converter that also produce spikes although at lower values and in this case it's possible to even decrease them to lower values by using a ceramic capacitor with low esr at the output, the low esr is the key.If you don't want any ps noise on your dut you should power it using batteries as source of power, and use analog voltage regulators like the 7812 for eg. Also in audio electronics a clean PS is preferable.

author: Fungus
author_rank: Super Contributor
timestamp: September 27, 2024, 01:11:04 pm
content: Yeah, something like this is probably useless for Audio.

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 02:43:31 pm
content: Here are the ripple measurements of my own PSU (12V), in case anyone is interested.Above without load, below with 1.5W.I will hardly need more power with this ps.That's good enough for me.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 03:16:26 pm
content: Quote from: Aldo22 on September 27, 2024, 02:43:31 pmNow with the load, change the aquire mode to average 8 and you'll get a more stable representation of the ripple of your ps, meaning a better visualization of the ups and downs of the stabilization.

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 03:34:51 pm
content: Quote from: ptluis on September 27, 2024, 03:16:26 pmThese screenshots are taken in "Hi-res" mode.This is also a type of averaging, but does not iron out as much as the “Average” mode.I think that's fine. 250uVrms ripple at 12V is OK. I don't think I can (or want) improve on that.Thanks.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 04:05:40 pm
content: Quote from: Aldo22 on September 27, 2024, 03:34:51 pmHigh res won't "clean" the signal as much as average does and that's why average is nice to "make the signal thinner" by removing the less constant acquired points and keep the most stable ones. It's a way of loosing fat

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 04:34:45 pm
content: Quote from: ptluis on September 27, 2024, 04:05:40 pmYes, that's where we reach the limits of my $150 scope.You need a stable trigger for average mode.But it doesn't manage to do that in the uV noise salad.But I remembered that it has a line trigger mode (50Hz)This works a little, but you can clearly see the limits.In the attached screenshot: 1.02mV/div ("zoomed")If you squint your eyes a little, you can see the capacitors discharging.But for $150 it's not that bad...

author: ptluis
author_rank: Frequent Contributor
timestamp: September 27, 2024, 06:21:28 pm
content: Quote from: Aldo22 on September 27, 2024, 04:34:45 pmThat's where 500uv/v scopes come in.And you know, it's better to have a 150€ scope that allow us to "see" electricity that have nothing and just guess. I use 70 bucks toy scopes like the dso2512g and the dpox180h for quick checking signals and only use the better ones when I need more accurate info on what's going on.

author: Aldo22
author_rank: Super Contributor
timestamp: September 27, 2024, 06:34:55 pm
content: Quote from: ptluis on September 27, 2024, 06:21:28 pmSure, but I can actually see enough.Delving deeper into microvolts doesn't give me any additional information that could be of practical use at the moment.obrigado

author: ptluis
author_rank: Frequent Contributor
timestamp: September 28, 2024, 12:58:22 am
content: Quote from: Aldo22"De nada"We're here to help each other

author: Aldo22
author_rank: Super Contributor
timestamp: September 28, 2024, 09:37:46 am
content: If you increase the number of acquisitions in average mode, you see a pretty clean signal.It's amazing what can be achieved with a few (cheap) tricks.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 28, 2024, 10:28:06 am
content: Quote from: Aldo22 on September 28, 2024, 09:37:46 amYes and it's a way to see if there's a problem with the rectificationbridge. if you have a not so good diode in the rectification bridge you will see it!but average mode is not good for signals when you can't get a stable trigger in this case hires mode could help better.

author: Eltax1693
author_rank: Contributor
timestamp: October 04, 2024, 03:22:23 pm
content: I'm on firmware 1.0Any newer version available?Thank you

author: Stray Electron
author_rank: Super Contributor
timestamp: October 04, 2024, 11:23:25 pm
content: Quote from: 4thDoctorWhoFan on September 21, 2024, 05:13:38 pm"U out" is very commonly shown on German made electronics instead of "V out". It must be a language thing.This is the explanation that I found online. One of our German members can probably tell us if it's correct.But now, I found, an explanation plausible and maybe also a historic for that, which is as follows: Germans started denote voltage by the letter "U", probably because that letter was largely unused and so couldn't be confused with anything else. It also came up by its etymology, since "U" stands for Unterschied, which in German means "difference"; very fitting since voltage is obviously the same as potential difference.

author: xKertx
author_rank: Regular Contributor
timestamp: October 05, 2024, 12:14:42 am
content: Quote from: Stray Electron on October 04, 2024, 11:23:25 pm"U" is not german. It is used in europe overall.

author: Aldo22
author_rank: Super Contributor
timestamp: October 05, 2024, 11:46:57 am
content: Quote from: xKertx on October 05, 2024, 12:14:42 amAs far as I know, "U" means “electrical voltage” (German:Spannung) and "V" is the unit Volt.The "U" comes from the Latin word “urgere”.It's like "I" ("intensité du courant") and "A" (Ampere).In English "V" is used for the phenomenon (in formulas) as well as for the unit.

author: Fungus
author_rank: Super Contributor
timestamp: October 05, 2024, 03:02:03 pm
content: OK, I bit the bullet and ordered one on Aliexpress.I'm gonna get a USB C charger to power it, it seems like the best/easiest option.FWIW: Ikea make awesome phone chargers and they'resupercheap. Their 30W"SJÖSS"should be enough for me (supports 20V, 1.5A) and they're only 7 Euros.I'm gonna get a bunch more of their little SMÅHAGELs as well. They're awesome for powering 5V gadgets, and only 3 Euros(!)

author: Aldo22
author_rank: Super Contributor
timestamp: October 05, 2024, 06:57:27 pm
content: Quote from: Fungus on October 05, 2024, 03:02:03 pmCongratulations!I'm still looking for a potential use for this thing.It's like the Fnirsi SG-003A: somehow I'm tempted to buy it, if only I could find a tiny rational reason to do so...

author: 4thDoctorWhoFan
author_rank: Regular Contributor
timestamp: October 05, 2024, 08:10:09 pm
content: Quote from: Aldo22 on October 05, 2024, 06:57:27 pmYou can NEVER have to many power supplies.The same goes for multimeters.

author: Nominal Animal
author_rank: Super Contributor
timestamp: October 05, 2024, 09:35:35 pm
content: Quote from: Stray Electron on October 04, 2024, 11:23:25 pmBoth U and V are common symbols for voltage; I've definitely seen both. U is also used in physics for potential energy (as is V and Eₚ, too).The situation is very similar to calling74W "tungsten" or "wolfram". ("Wolfram" is the original one, stemming from the ore wolframite; "tungsten" derives from the scheelite ore, then called tungsten, and is Swedish for "heavy rock". Basically, Scandinavian mountain miners used the former, German (and slavic miners later on) the latter, way back in the day. The German miners just had a habit of naming their ores more imaginatively, )In physics, many prominent physicists in the 1700s to early 1900s developed somewhat distinct patterns of notation, including which letters they used for which physical properties and measurables (especially U, V, and what superscripts and subscripts were used for). Some even developed completely new notations; see e.g. Dirac orbra–ketnotation.Einstein notationin particular can throw even mathematicians off, but is very common in some areas of physics.There is no specific correct notation. It is just a matter of convention; whatever one is used to. Claiming otherwise is just succumbing to a perceived authority, and rejecting individual thought. Certainly, all the great scientists have changed notations whenever it suited them, simply because it is just a tool, a way to convey the ideas and expressions.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 06, 2024, 12:51:13 am
content: Quote from: Aldo22 on October 05, 2024, 06:57:27 pmThey can be quite handy, these small SMPSUs and the ability to have a small adj. powersupply with a powerbank or LIPO cellpack.and PD3.1 (28v/5A) powerbank with 140watt works well with either a 100W or 150W. 30/5A SMPSU.

author: Aldo22
author_rank: Super Contributor
timestamp: October 06, 2024, 10:20:18 am
content: Has anyone tried out how quickly it regulates the current when you plug the cables in?I have a lab power supply which regulates too slowly.For example, if I set it to 100mA max, then remove the cables and plug it back in, I get a peak of about 700mA for half a second until it regulates again.This means that a DMM with a 250mA fuse then needs a new fuse.What about the DPO-150?You can test this with a DMM, which has a “Max” setting, or with an oscilloscope and a resistor.Thank you.

author: Verticon
author_rank: Contributor
timestamp: October 10, 2024, 02:59:25 pm
content: Hello DaneLaw,in your picture with the power bank the display of the DPS-150 shows 28V. Is the DPS-150 connected via barrel connector? According to this thread the max. voltage via PD is 20V, isn't it.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 10, 2024, 04:00:21 pm
content: Quote from: Verticon on October 10, 2024, 02:59:25 pmYes, IM running it with PD3.1 chipped cable with a barrel connector rated for the wattage.. It will take its rated 32v voltage on both its TypeC or its Barrel connector.The DPS150 internal PD-chip can only trigger up to (20v/5A) but you can easily trigger for it, outside, and it will just take it as a crude DC input without any handshaking.Its inner barrel connector is the 2.5mm variant.25v/5A130W PD3.1 powerbankThe graphing timebase segment' can be toggled between 1sec to 5sec.and you can of course also use LIPO packs.Like a 6cell that will be up around 24.5 to 25v when fully charged' just make sure to use cables that are rated for that amount of wattage.Im not here, -with that amount of voltage sack.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 10, 2024, 05:34:18 pm
content: Some of the features in the PC software that are just an executable. (don't need to be installed)The start button up left, will start logging data values to an excel file..

author: Aldo22
author_rank: Super Contributor
timestamp: October 17, 2024, 11:04:16 am
content: I got one of these today.The accuracy is amazing for a PSU.Also ideal as an “afterburner” for those rather crude, cheap Aliexpress PSUs if you need a bit more control.Still a cheap solution. Together with the 300W Longwei (which I had bought before), I paid less than $100.

author: Aldo22
author_rank: Super Contributor
timestamp: October 17, 2024, 04:39:22 pm
content: But it's pretty noisy.Why didn't anyone tell me that?Attached (all without load):1. DPS-150 without 'scope BW limitation / 12V2. DPS-150 with BW limitation 20MHz / 12V3. for comparison my self-built (linear) PSU / 12V. Same measurement conditions, without BW limitationP.S. On / Off characteristics here:https://www.eevblog.com/forum/testgear/lab-power-supply-turn-on-and-off-characteristics/msg5680719/#msg5680719

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 17, 2024, 06:30:19 pm
content: Quote from: Aldo22 on October 17, 2024, 04:39:22 pmYou didn't check the specs?Do you have a picture of your setup..?

author: Aldo22
author_rank: Super Contributor
timestamp: October 17, 2024, 06:59:46 pm
content: HiQuote from: DaneLaw on October 17, 2024, 06:30:19 pmWhere are the exact ripple/noise specs?Quote from: DaneLaw on October 17, 2024, 06:30:19 pmNot today, the setup is no longer there.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 17, 2024, 07:07:41 pm
content: Quote from: Aldo22 on October 17, 2024, 06:59:46 pmI posted a video some weeks back also in this thread. seems it's gone, at my endWill see if I can find it.Reason why I ask for "setup" is to get an idea if it is the DPS150 SMPS or third party your witnessing*One moment please (credit bigClive)*// I recall this video also refers to the DPS150 tolerances.The specs .. you can find in the older DPS-150 thread..not sure why this OP (LeonR) decided to restart another DPS150-thread with no input, when there already was one, just below from a day earlier that would be hard to misshttps://www.eevblog.com/forum/testgear/new-fnirsi-dps-150-mini-lab-power-supply-(30-v-5-a-usb-pd-powered)Board pictures.(crude, from older vid)

author: Aldo22
author_rank: Super Contributor
timestamp: October 17, 2024, 08:01:00 pm
content: It's OK.You asked me if I hadn't checked the specs. I still don't know where to find the ripple/noise specs.But never mind, I can measure it myself now.Quote from: DaneLaw on October 17, 2024, 07:07:41 pmThe third screenshot above shows the source for the DPS -150 in the other cases. It is super quiet.The measurement method is identical.Thanks.

author: Aldo22
author_rank: Super Contributor
timestamp: October 17, 2024, 08:11:15 pm
content: Another observation:When I connect the power source to the DC input, sparks fly.This worries me a little, but it works normally.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 17, 2024, 08:33:27 pm
content: Quote from: Aldo22 on October 17, 2024, 08:01:00 pmOk?It claims the ripple tolerances to be sub 20mV and the posted video above tries to highlight getting way below that..https://www.fnirsi.com/products/dps-150Its highlighted below, I even hand-drawn a heart..

author: Fungus
author_rank: Super Contributor
timestamp: October 17, 2024, 08:43:28 pm
content: Quote from: Aldo22 on October 17, 2024, 08:11:15 pmThere might be a big capacitor across the input so this is inrush current. The capacitor will look like a short circuit for a fraction of a second.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 17, 2024, 09:03:41 pm
content: Do value the display, more than I reckon I would when I got it.Having time-aspect graph/trend info.. quite helpful when trying to make heads & tail of all the different test features in a programmable electronic load.Though the fastest you can get is 0.1s if I recall correctly, so fast pulses, gonna be cramped.

author: ptluis
author_rank: Frequent Contributor
timestamp: October 17, 2024, 11:58:42 pm
content: Quote from: Aldo22 on October 17, 2024, 08:11:15 pmFirst connect the cable to the input of the fnirsi, then power on the input power supply, battery, etc

author: Aldo22
author_rank: Super Contributor
timestamp: October 18, 2024, 08:50:45 am
content: Quote from: ptluis on October 17, 2024, 11:58:42 pmWhenever possible, yes.But not everything has a switch.For example, the old laptop power supply (19V / 65W), which is actually quite suitable, does not have one.Well, you can switch it on a socket strip...It's not really a problem, just an observation.

author: Aldo22
author_rank: Super Contributor
timestamp: October 18, 2024, 08:59:43 am
content: Quote from: DaneLaw on October 17, 2024, 08:33:27 pmThanks, I had seen that once.But it looks to me more like it comes from the marketing department.What does 20mV mean? mVpp?I assume mVrms, which is not exactly low noise.Quote from: DaneLaw on October 17, 2024, 08:33:27 pmI don't know what he's doing there.Too fast, too blurred, too vertical, too Chinese...In addition, I now believe that when looking at or measuring spikes, it only makes sense to make comparisons with the same scope, method and setup.Even with the same scope, you can get drastically different results depending on the acquisition method, memory depth, time scale, bandwidth limitation, etc.So it only makes sense if you leave everything the same and then look at different PSUs.

author: RAPo
author_rank: Super Contributor
timestamp: October 18, 2024, 02:56:35 pm
content: To be more precise; you have to buy a yellow DPOX180H no other scope will do. (seeking cover now).Quote from: Aldo22 on October 18, 2024, 08:59:43 am

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 18, 2024, 04:08:45 pm
content: Quote from: Aldo22 on October 18, 2024, 08:59:43 amUsually peak to peak' but reach out and ask them.they are one of the few that actually seem to have some customer support. (you got the link above)sub 20mV ain't half bad and as highlighted..the fellow in the video, writes that he got 8mV so way below the 20mVIf low ripple/noise is fundamental for you, then you're purchasing the wrong products, by jumping on the cheapest switching-mode bench power supply China can muster (Longwei) alongside a tiny Fnirsi DPS-150 that clearly are optimised for mobility.Look instead for a linear bench supply.. they cost around the same, not much more.. 60 to 70 euro from brands like Korad, and from western resellers, but they are heavy as.Got two myself.https://tinyurl.com/5n94yxjnThe noise I experienced in fx AlienTek DP100 is certainly not bad for an SMPS product of this size.If I recall correctly, its pp-rated sub 10mV but only goes to 100WIf your unsure, on how to measure and don't screw up your measurement from bringing in third party noise, you can maybe get some hints from Dave's video, alongside something to compare against, where he tested the DP100.From +27:30

author: Aldo22
author_rank: Super Contributor
timestamp: October 18, 2024, 04:53:27 pm
content: @RAPo@DaneLawQuote from: RAPo on October 18, 2024, 02:56:35 pmI don't think so.Even with the cheapest desktop scope, you can control what you want to see much more than with the handhelds.I don't have a DPOX, but I do have a Zeeweii.Take a look: This isthe same signalviewed with the Hantek. Once I want to see the noise (Peak Detect, "dso2000_dps150_peak.png" ) and once I only want to see the repetitive part of the signal (Average, "dso2000_dps150_avg.png").I don't know the DPOX, but with the Zeeweii I only have one possibility ("zeeweii.png").Again, this is all the same signal!The signal generator is an XR2206, which is fed by the DPS-150.If the XR2206 is fed with a linear PSU, it looks like in "dso2000_lin_peak.png" (Peak detect) and "dso2000_lin_hr.png" (High Res.).So much less noise.

author: Aldo22
author_rank: Super Contributor
timestamp: October 18, 2024, 05:21:54 pm
content: Quote from: DaneLaw on October 18, 2024, 04:08:45 pmIt's all good.I definitely have a use for these devices.I'm not complaining, I'm just noting (for others) that the DPS-150 has a certain amount of noise.Not as bad as the Longwei, but definitely noticeable.I don't regret the purchase.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: October 18, 2024, 08:28:06 pm
content: Quote from: Aldo22 on October 18, 2024, 05:21:54 pmThe thing Im trying to highlight is the fact that the noise your showing in your pictures doesn't have to be from the DPS-150, as it's quite intense, could be third-party aspect that is introducing it.According to your own pictures, when you're using the extremely noisy sub 50$ switch-mode Longwei bench supply, to run your DPS-150 you're gonna put a lot of noise into the DPS 150, same with many power sources.https://www.eevblog.com/forum/testgear/new-miniature-programmable-dc-power-supply-fnirsi-dps-150/?action=dlattach;attach=2404921;imageGarbage in, garbage out.. its not gonna filter all that out.. its a tiny supply... also what is explained in the video with the timestamp I gave you.

author: Aldo22
author_rank: Super Contributor
timestamp: October 18, 2024, 09:09:11 pm
content: HiQuote from: DaneLaw on October 18, 2024, 08:28:06 pmNo, I want to be fair to the DPS-150.I only feed it with the output of the linear PSU.The fourth picture above “dso2000_lin_peak.png” shows the “sine” of the XR2206 with the linear PSU at the input.In the first picture “dso2000_dps150_peak.png” only the DPS-150 is connected in between. The DPS-150 gets the same input as the XR2206 in the other picture. No Longwei or other SMPS are involved.So I can say that the noise is probably coming from the Fnirsi.But of course I set the oscilloscope, the probes and the amplitude of the XR2206 so that you can see the noise very clearly (No BW Limit, Probes 10x, Peak detect, low voltage...).Nevertheless, “dso2000_lin_peak.png” and “dso2000_dps150_peak.png” were taken under exactly the same conditions.The difference is real.

author: Aldo22
author_rank: Super Contributor
timestamp: October 19, 2024, 11:31:32 am
content: Does anyone have information about the control protocol?The PC program shows that it can be controlled remotely (USB).But I would prefer to control it from Linux. A Python script/interface without GUI would be great.Is there any information available?

author: Fungus
author_rank: Super Contributor
timestamp: October 20, 2024, 06:39:13 pm
content: If it's anything like previous models it'll be a serial port with CH340 chip inside it.You could tap into the serial data and look at the protocol. I bet it's not complex.

author: Aldo22
author_rank: Super Contributor
timestamp: October 21, 2024, 11:38:28 am
content: Quote from: Fungus on October 20, 2024, 06:39:13 pmWhat do you do that with?Wireshark? I have no experience with that.I think it would be a big plus if you could script this ~$40 PSU.The GUI tool looks fun, but a script that could be synchronized with other devices would be much more useful.Setting the voltage and current would be enough imo.

author: RAPo
author_rank: Super Contributor
timestamp: October 21, 2024, 12:27:31 pm
content: The ch340 converts usb to serial/uart and then you can do something likethis.Quote from: Aldo22 on October 21, 2024, 11:38:28 am

author: Aldo22
author_rank: Super Contributor
timestamp: October 23, 2024, 02:38:08 pm
content: Quote from: Fungus on October 20, 2024, 06:39:13 pmI think you lost that bet.If it's easy for you, then show me how it's done. Please.

author: Fungus
author_rank: Super Contributor
timestamp: October 23, 2024, 07:32:30 pm
content: Quote from: Aldo22 on October 23, 2024, 02:38:08 pmThat's not how things work around here.Update: My DPS-150 arrived today. Haven't tried it yet though...

author: Aldo22
author_rank: Super Contributor
timestamp: October 23, 2024, 08:00:24 pm
content: Quote from: Fungus on October 23, 2024, 07:32:30 pmHave fun!

author: Aldo22
author_rank: Super Contributor
timestamp: November 03, 2024, 03:31:20 pm
content: I just wanted to mention that I am very satisfied with this little device.The volts and amps can be adjusted with sufficient precision and safety.I use it more often than I would have thought because it just sits there without taking up any space.Meanwhile, my 300W Longwei is in the cupboard.I feed it with a 45W PD fast charger. That's enough for almost everything for me.I can recommend it.

author: slutsteg
author_rank: Newbie
timestamp: November 10, 2024, 10:19:16 am
content: I hope EEVblog will test this device!In general, how reliable is FNIRSI with fixing and updating the firmware for this model?Does anyone have tips on an older EU adapter for electronics that supports 230V input and can deliver over 30V and 5A, so I can get the full output of 30V and 5A?

author: Aldo22
author_rank: Super Contributor
timestamp: November 10, 2024, 11:54:43 am
content: Quote from: slutsteg on November 10, 2024, 10:19:16 amThis little device simply works. I haven't found any problems yet.Therefore it does not need an FW update.A Python script for remote control would be nice.

author: Aldo22
author_rank: Super Contributor
timestamp: November 11, 2024, 09:35:47 am
content: Kerry WongI took a look at the “problem” with the subsequent triggering of the overcurrent protection.It's not ideal, but it's not that bad either.It protects the first time. It shows you “OCP” in red when it has switched itself off.Do not switch it on again in this state, but press “Home” twice.Then “OK” appears again in green and so you can switch it back on and the protection works.If you know this, it is not a problem imo. But yes, it could be done better.

author: rozwell
author_rank: Contributor
timestamp: November 11, 2024, 06:18:10 pm
content: Hello there!Anyone knows if it has reverse current protection?For example: I'd like charge EFB car battery with CC 5.0A / CV 14.60V until my power bank with PD@20V runs out of juice.Will DPS-150 survive when power bank recovers and for some reason negotiate lower voltage, like 5V of 12V?

author: Aldo22
author_rank: Super Contributor
timestamp: November 11, 2024, 07:50:01 pm
content: Quote from: rozwell on November 11, 2024, 06:18:10 pmThe manual says:Protection Mechanisms● Overvoltage Protection● Overpower Protection● Overcurrent Protection● Overtemperature Protection● Undervoltage Protection● Reverse Input Protection● Reverse Output Protection

author: rozwell
author_rank: Contributor
timestamp: November 11, 2024, 09:18:37 pm
content: Quote from: Aldo22 on November 11, 2024, 07:50:01 pmOf course, the manuel, I forgot about their website, thanks!I just checked it and found these under7.Precautionssection of the manuel:The product operates in step-down mode, so ensure that the input voltage is higher than theoutput voltage.The power supply range for this product is DC 5V~30V. Output will be disabled if the inputvoltage is lower than 5.0V due to undervoltage lockout, (...)When charging batteries, it is strongly recommended to add a reverse current protectionmodule (such as a Schottky diode) to the output end to protect the device from damage.So I'll probably use a mosfet for reverse current protection

author: DaneLaw
author_rank: Frequent Contributor
timestamp: November 11, 2024, 11:42:17 pm
content: Quote from: rozwell on November 11, 2024, 09:18:37 pmYep, take your precautions, I did not read the manual, and Im down a Ugreen PSU that took the kickbackhttps://aliexpress.com/item/4001026960817.html?when trying to nurse a 9v back to equilibrium.

author: Newii
author_rank: Newbie
timestamp: November 17, 2024, 04:09:12 am
content: I saw Kerry's review and the OV OC protection takes a long time to kick in, it takes 500ms. Has anyone who has the product tried to replicate what's in the video?https://youtu.be/ZY2zKWzFi7E?si=PgV8v06HdMPJ_JbK&t=1155

author: Aldo22
author_rank: Super Contributor
timestamp: November 17, 2024, 01:06:14 pm
content: Quote from: Newii on November 17, 2024, 04:09:12 amYes, it responds slowly.I wouldn't rely on it.Other than that, the switch-on behavior is quite good.

author: Aldo22
author_rank: Super Contributor
timestamp: February 17, 2025, 11:03:44 am
content: Some new reviews:German:https://www.elektormagazine.de/review/fnirsi-dps-150-kompaktes-und-tragbares-netzgerat-und-wandler

author: Paul T
author_rank: Regular Contributor
timestamp: February 20, 2025, 01:41:04 pm
content: Quote from: rozwell on November 11, 2024, 09:18:37 pmPlease come back and show us your effort and the results.

author: seavan
author_rank: Contributor
timestamp: May 02, 2025, 03:40:05 am
content: My DPS-150 has a strange 150ms pulse every 600ms under load and without any load. Wondering if its just me or DPS-150 stands for 150ms pulse.

author: Aldo22
author_rank: Super Contributor
timestamp: May 02, 2025, 09:22:13 am
content: Quote from: seavan on May 02, 2025, 03:40:05 amMy scope isn't quite as great as yours, but I see something similar.Here it comes about every 530ms if the scope measures correctly.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: August 03, 2025, 02:31:22 am
content: Here is a Web-based interface that can be used with fx Chrome browser.Connect a cable to the DPS150 MicroUSB socket and connect..https://cho45.stfuawsc.com/dps-150/Seems more or less all the features have been ported, incl. voltage & current sweeping.My first impression was quite positive when I tried it out some time back.- Credit goes to a Japanese fellow, as far as I can tell.GitHubhttps://github.com/cho45/fnirsi-dps-150Video in japanesehttps://youtu.be/_RqsPEhD9YM?si=Taddr2zI9bBO_3_r&t=217

author: Aldo22
author_rank: Super Contributor
timestamp: August 03, 2025, 06:56:47 am
content: Quote from: DaneLaw on August 03, 2025, 02:31:22 amApparently there is now also a Python interface that is suitable for scripting:https://gitlab.com/fanfanlab/pydps150

author: Aldo22
author_rank: Super Contributor
timestamp: August 03, 2025, 10:26:26 am
content: Just tested the python script.Works well (the web-based interface too)I think this is another advantage of the DPS-150.Example measured on an 8.2Ω resistor:Code:python ramp_gen.pySet: 0.00 V | Measured: 0.00 V, 0.00 ASet: 0.10 V | Measured: 0.10 V, 0.01 ASet: 0.20 V | Measured: 0.20 V, 0.02 ASet: 0.30 V | Measured: 0.30 V, 0.04 ASet: 0.40 V | Measured: 0.40 V, 0.05 ASet: 0.50 V | Measured: 0.50 V, 0.06 ASet: 0.60 V | Measured: 0.60 V, 0.07 ASet: 0.70 V | Measured: 0.70 V, 0.08 ASet: 0.80 V | Measured: 0.80 V, 0.10 ASet: 0.90 V | Measured: 0.90 V, 0.11 ASet: 1.00 V | Measured: 1.00 V, 0.12 ASet: 1.10 V | Measured: 1.10 V, 0.13 ASet: 1.20 V | Measured: 1.20 V, 0.14 ASet: 1.30 V | Measured: 1.30 V, 0.16 ASet: 1.40 V | Measured: 1.40 V, 0.17 ASet: 1.50 V | Measured: 1.50 V, 0.18 ASet: 1.60 V | Measured: 1.60 V, 0.19 ASet: 1.70 V | Measured: 1.70 V, 0.20 ASet: 1.80 V | Measured: 1.80 V, 0.22 ASet: 1.90 V | Measured: 1.90 V, 0.23 ASet: 2.00 V | Measured: 2.00 V, 0.24 A

author: geonicz
author_rank: Contributor
timestamp: August 14, 2025, 04:07:28 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: Paul T
author_rank: Regular Contributor
timestamp: August 14, 2025, 04:14:53 pm
content: I had good experience with FNIRSI customer support using the chat feature of the AliExpress notification system. Used the same thread that my store shipping notices came in.

author: geonicz
author_rank: Contributor
timestamp: August 15, 2025, 04:05:29 am
content: I've contacted them twice(for the first dead device dps150 and for sag-55) via their official support. No aliexpress was involved, only official support from their official site.

author: LeonR
author_rank: Regular Contributor
timestamp: August 30, 2025, 03:27:51 pm
content: Quote from: geonicz on August 15, 2025, 04:05:29 amIf you got the products via Aliexpress you can contact the shop on the platform. Aliexpress also have buyer protections - if the product is defective within a warranty period, you can use the "Buyer Protection" if they stated any kind of warranty on the product's page.

author: Black2008
author_rank: Newbie
timestamp: September 23, 2025, 11:08:40 am
content: Please tell me what the latest firmware is for this unit.

author: d-el
author_rank: Regular Contributor
timestamp: September 24, 2025, 10:28:36 pm
content: My measurements of the DPS-150 power supply.A linear power supply is used as the source for DPS-150.Static errorThe DC meter used was Agilent 34401A.Static measures:NoiseLoad 50Ohm,Set 8V, 1A (is CV mode), noise Vrms 0.9mVSet 8V, 20mA (is CC mode): 6mVI plotted the noise spectrum on a 50 Ohm load, the maximum peak was around 380 kHz.Transient responseSemiconductor resistors and a switch controlled by a functional generator are used as a transient generator. One resistor with a resistance of 10Ohms is connected in parallel to the output of the device under test, the second resistor with a nominal value of 7.3Ohms is connected in parallel to the device under test through a controlled switch. Current measurement is performed using a Lecroy AP015 current probe. The voltage measurement is performed directly at the terminals of the device under tested using a high impedance passive probe.Set 8V 4A, rise:Set 8V 4A fall:Set 8V 1A CV-CC-CV:CV->CC LED testhttps://youtu.be/dFrufUv_JTY

author: d-el
author_rank: Regular Contributor
timestamp: September 24, 2025, 10:38:16 pm
content: Cringe

author: Paul T
author_rank: Regular Contributor
timestamp: September 24, 2025, 10:54:58 pm
content: Jazzy Jane just reviewed the miniware. It has no problem increasing the voltage from the supply and producing a delicious output. That is what I consider a true power supply.