Best Low Cost Power Supply - Kaiweets Improved
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- Опубліковано 20 тра 2021
- This video will show how to lower the noise on the output of the Kaiweets PS-3010 DF 30V 10A Power Supply. This Kaiweets Power Supply is a low cost power supply with 0-30 V range and up to 10 Amps output. It is a switcher so does have some noise, so we will add some filtering to improve this.
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Part 1 of this video: • FLIR vs FLUKE High-End...
Link to Kaiweets Power Supply at Amazon: amzn.to/32GQtFU
Link to thermal imaging camera: amzn.to/2ZHMAyD
Links to other Multimeters:
FLIR DM92 multimeter: amzn.to/2ztKOXI
FLIR DM93 multimeter: amzn.to/3ebyASF
Amprobe AM570 multimeter link: amzn.to/3eurd8S
Fluke 117 multimeter link: amzn.to/2AhsEbA
Amazon Commercial 90DM030 multimeter: amzn.to/2Jl9yCT
Popular Links:
Micro-cap Tutorials playlist link: Micro-Cap • Micro-Cap
Boost Converter Introduction • Boost Converter Introd...
Power supply talk: • Power Supply Types and...
Link to Amazon for Boost Converter: amzn.to/32HOEFsY - Наука та технологія
It really shows Eddie has been working with power. He recognized the problem and the fix straight away!
Thank you! Much appreciated;)
Awesome! Keep on testing!
Thanks! Will do! ;)
I gonna get one and do the same modification. You are the master, thank you!
Thank you! I appreciate you!
This was wonderful, I've waited patiently for this over the last few months and it was well worth the wait! Thank you, I'll perform the modification. This will help in my beginner electronic endeavors. I'll keep an eye out for future mods and vids. Love watching your stuff... sincerely a beginner electronic enthusiast ;)
Thank you for waiting;) I hope this helps.
Hi Eddie, thank you sooo much for another Amazing Video and Great Tutoring.
You bet! And thank you for your support!
Now you're talking! Nice job with the noise, but I'll like to see the second video improving it even more! Thanks again for your ideos!
Thanks Tony! I”ll have to see what I can do on the second power supply;)
Really enjoyed the detail in what you were doing. I'm not quite ready (experience wise) to do this to my Kaiweets, but I plan to refer back to this video when I am. I followed along scoping my ps and learned some things. Thanks!
Thanks Jay! Please let me know if there's anything I can show that will help;)
Good video, i like ! I think we need to send some funds to help you get a bigger bench & stronger :) Good work Eddie !
Thank you! That would be awesome;)
Great job Eddie 👌...
Thank you!!
I just got one on Amazon prime for $76 plus tax. Great deal, thx for the videos.
That's great! Thank you! I'm including a link for anyone interested: amzn.to/2Tfcs4a
@@KissAnalog I bought a 2nd one! No problem ganging them together with the ground bussbars removed for 64V series, or over 20A parallel, making sure to set both supplies identical before connecting them. No issues at all for a quick test, but nice and dangerous conditions achieved 👍
Have not tried it with unbalanced settings, I think that would be ok, but why risk it with 2 new supplies.
I wish I understood this video better, but I guess that's what learning is all about 😅 I'm subscribing!
Thanks so much! Glad to have you on the team!
Thanks for great video. I've got this one and had to get more amps one that could drive DC motors that require 22 amps to start.
Thanks for that feedback! Much appreciated!
Very KNOWLEDGEABLE
Thanks 👍
Kiss Anulog
From Nick Ayivor from London England UK 🇬🇧
Thanks so much! I appreciate you!
thanks for video sir
Thanks! I appreciate you!
Back in high school, I think I attempted this kinda mod on every bench supply I owned. They were all linear, most of them were boat anchors and way less (HF) noisy than comparable supplies today...you know, mostly just 60/120Hz ripple artifacts sneaking through and visible when the scope was zoomed way into the noise floor. For whatever reason, I thought the outputs all needed to be cleaned up. I think I only managed to make them worse. "Uhhh. What's a common-mode? The coil goes after the cap, right? Uhhhh" I need to open one up someday and see exactly what I did. Surely it'll be worthy of a spot in the marvelous museum of kludgy blunders.
Thanks for this feedback! I’ll have to show more with the modification for the second power supply mod;)
@@KissAnalog Excellent! I'll wait for the next mod video before I order parts for my new Kaiweets! :)
It would be great to see a side by side comparison of several budget switching power supplies to see what is best out of the box.
Thank you! I’ll do that.
Hi Eddie ! A fantastic video!!! THANK YOU for taking the time to present and edit this well planned and executed video. I just bought one of these KAIWEETS power supplies (based on your earlier review video) and am interested in doing these mods to mine soon as well. You identify all the cap. values you used nicely,,, BUT I believe you missed (around 14:09 in the video) the value of the blue square shaped polypropylene capacitor you inserted just before the inductor. As I don't have many capacitors around, I will be buying some for this project - so I would be very grateful if you could reply and let me know. I have re-watched your video a few times and I have tried reading as many of the other comments hoping to see if this was already addressed,,, if it was, I apologize, I must have missed it. THANKS AGAIN... (and keeping my fingers crossed that you see this comment so many moons past your original posting).
Thanks for your feedback Rick! I’m sorry I am surprised I didn’t mention that cap, I wonder if I edited it out by mistake. I think it is a 1uF but I’ll open it to check.
@@KissAnalog . Thank you Eddie ! You are to be commended for replying to me this far down the road. I also see from reading comments following a number of your other videos that this is very common for you. Kudos. I know you've got lots on your plate, no hurry, whenever you get a chance to look at that capacitor value.... I will be grateful. (in the mean time,,,, I'll try 1uF as you suggest). THAT BEING SAID... In this video you put a 0.022 uF ceramic cap at one end of the trace and the 1uF (the one I'm asking about) on the same trace closer to the inductor. Are the different values filtering different RF frequencies to ground? And is the positioning of these critical? If you're looking for topics for future videos... perhaps one discussing this type of filtering further... and how you select the capacitor values. Thanks again Eddie!
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Thank you! Much appreciated!
Number one instrument review and learning channel on UA-cam 💞
Thanks so much! I appreciate you!
You got my attention...
Thanks - that’s awesome!
Thanks Eddie.
To me it looks like they got the snubbers wrong. The other thing I'd like to see is how the noise looks under load conditions.
I see you like the Instek scope. I just picked up their electronic load, not cheap but really nice.
You bet! Thanks for the feedback! I’ll have to show more testing when I modify the second power supply;)
I think Kaiweets should hire you to design their power supplies. Probably would be great right out of the box. Then again they are pretty good for the price. It isn't like you spent Rohde & Schwarz money. Hey wanted to mention another youtuber I watch named the Imsai guy mentioned you and said he liked your channel.
Thank you! I’d love to help them;). Actually, there is probably a small change in the design that could have solved a lot of this. Thanks for the tip! I’ll have to go to Imsai and see his channel.
Great video and demonstration Eddie. 1mV noise is pretty good for such a simple change. Has it had much impact on the transient response of the supply?
Thanks Andrew! The small values used shouldn’t affect the response, but it might not be a bad idea to do some testing and have a follow up video during modification of the second power supply.
Nice job cleaning this thing up man!
Do you still like it or is there better cheap ones available now?
Eddie, will you be giving feedback to Kaiweets so they can consider adaptation of your filtering methods? I was going to purchase the unit but will wait a bit longer for your further noise reduction experiments. Great review!
Yes, absolutely. They are very easy to communicate with, but we will see if it goes back to their engineering;)
top one eddie
Thanks so much!!
Great vídeo!!! Very interesting, have you tried to put a common mode ferrite in the output cable?? thank you!!!!!
That is a great question! I actually did try this. I’ll show this in a follow up video when I do the second power supply;)
@@KissAnalog 😎
7:25 and 12:40 perfectly cut to the screen, this make it simple and clear, instead of i.e. a zoom-out with everything in one frame.
Here is maybe a way you can think of it, you are showing exactly what your brain is doing, holding the probes while looking at the scope, you are not looking at both but do sometimes make your eyes switch back to make sure the connections is still ok. To make a perfect cut, like you did, do you have to simulate what the human brain does.
I.e. a person tells you he has got new shoos, you will then look at his shoos, your brain has automatically cut out your eyes panning, tilting, zooming and focusing down to his shoes For you will it seem like you have made a "cut" from his face to his shoes. :-)
Thanks Fried Mule - that’s a great idea and way of looking at it;)
Nice job cleaning that output, I'm guessing you are going to need to put a snubber or slowdown the switching transistor to get rid of that 2MHz ringing that remains.
Thank you - much appreciated! Yes, I think we go to the source;)
That's a great question - thanks! I think so, but I'll have to look at the circuit to see what's going on right now;)
Hey thank you, so interesting! I am new in electronics and for the moment I am working on small projects on Arduino and self balancing robots. Do you think I need to remove that noise? I supposed it is for more complex projects than dealing with IMU?
Thanks for the great question! I think good bypass capacitors are enough for most applications. Audio is probably the most sensitive, but it doesn’t take much to get clean enough power;)
@@KissAnalog Thank you for your answer! I understand so much more now! A bypass capacitor? Good and logic Idea! :D
What are the drawbacks of the caps? Slower transition on output voltage/draw changing? Worsened surge when tripping overcurrent protection?
Thanks
have try with 105(1uf) polyester type capacitor
Thank you! The poly caps are great! I like the polypropylene better, but polyester are good too;)
Nice video, but what's up with those caps when we get shorted test leads on debugging a shorted device or set amps parameter? are those new
caps exposed to a failure??
Thanks Paulo! The video angle made it look like the wires were close, but they are stiff bus wiring and there is good spacing between them.
$100 almost reasonable price range 👏👏👏👏
Thanks - I agree;)
I wonder how the improvement looks under with the power supply under load, would it be more or less significant?
I wouldn't be surprised if it actually gets better under load.
I would like to see how Eddie’s improvements behave under a load. Do the caps discharge quickly under load?
Thanks for asking! Great question! I did have some video on that, but I decided to keep this video getting too long and make a new video to focus on this type of filtering and circuitry;)
Hi Eddie. Could you have done these measurements using the MicSig scope? (You sold me this scope, so you kind of have a responsibility to show me how to use it!) Seriously though, I was told to do differential measurements using two scope probes and two channels set to display the difference between the two (mathematical subtraction function). I know the MicSig can do this and presumably your GwINSTEK can too? Would this make any difference? Finally I wonder about the impact of having even a fairly modest load on the PSU output. Open circuit is definitely a hard case noise wise.
Thanks John! That’s a great idea - I think I’ll use the Micsig to do the modification on the second power supply that I have. I’ll do some loaded testing as well.
I noticed that there is a jumper plate connected between the ground and negative terminals, can you explain when to properly use it and remove it for some applications? Mine came with this jumper and the manual doesn't reference it.
Yes thank you! I'll do a quick video on this;)
Cool video but do i really need to do this mod if i just want to use this power supply for electro plating?
No - not at all. This power supply is great without the modification. Whatever you are powering will most likely have input power filtering.
One pointer: Do you realize that lossless choke and lossless capacitance only shift the resonances? For attenuation, you generally should have some lossy component, i.e. a resistor involved. That could be a small ( a few ohms) in series with the capacitor. Or it could be certain kind of ferrite core. One around BOTH output wires (common mode) filter with lossy characteristics. I have had experiences suggesting much improved performance compared to plain, low loss capacitors.
Old school linear is all I use, much better. Plenty available on eBay, for now....
Same here, I have a couple of HP linear supplies and they are super reliable with clean outputs. I do have a switcher on my bench too for higher current stuff though.
Linear PS are great, but can be large and expensive at 30 V and 10 Amps;) There are some good used options though;) But for under $100, this is not a bad option;)
Linear are equally bad. The only thing they are good is OC resistance and due to lack of noise they live longer. The way they function, they dissipate ton of energy into heat even in idle. And they can't provide exact voltage, so they combine several lines via relay and route excess into heat. Can be up to 50% of PSU power in bad case. They also produce LF noise.
Yeah, seriously inefficient, but, as you say, last longer. I have four switchers two of which already died (one repaired, one waiting). All three linear`s, including one from fourteen years ago, and abused to shit, all work well to this day. The linear`s also track faster in CC mode, which I use a lot.
The best PSU is a tracking hybrid, with a large reserve cap (for CC mode). I have several designs I am working on, ...very challenging to make work very fast tracking (as in two orders of magnitude faster to around 500kHz), ...but I am determined, and not willing to spend US$10k`s for a commercial unit. There is a RIGOL linear that can do about 100kHz I believe at about US$1k, but do not quote me on it. :)
@@stevenbliss989 depends. You get good quality igbt, put large heatsink on them. Then you get good hightemp caps, preferrably everywhere near output, and keep them away from these heatsinks. And you keep the board horizonally, so it doesnt dive into upper heat zone. And a large ferrit filter on output too to remove the switching noise... Thats a happy inverter =) It might still blow some resistors, but rarely though. But metal and caps cost money. Thats why you have these small densely packed units, designed to operate 15 minutes max....
I'm waiting for for reviews and teardown
Then purchase RD6018 series power supply if they send a free sample for reviews
Thanks for this great idea;) I actually purchased one and will review it very soon;)
Please make a video smps primary and secondary snubber design ( diode,resistor, cap)
“Snubber” I think?
Thanks! I will cover snubbers and clamps - maybe soon;)
@@davecc0000 yes you right , its my typing mistake
Thank you
@@KissAnalog ua-cam.com/video/3OCWQxi28oM/v-deo.html
What about the linear power supplies on Ali?
Thanks for asking! Do you have an example?
Is this little switch mode power supply kit doing the same thing ? from diyaudio .com
SMPS DC Filter P089ZB Kit
Or would this add even more filtering? We’re by adding too much could it damage the power supply ?
At the do it yourself audio store this is to add to the switch mode power supply bricks that are to be used for AUDIO
Thanks for the lead on this kit! This kit would probably help, but it would not clean up a lot of the high frequency noise - especially the common-mode noise. Also, it would need to have a larger inductor rated at 10 Amps to be used on this power supply;)
It has a board inside LWxxxxx
Is this a Longwei board and is it the same as Longwei 3010DF but $40 cheaper than the Kaiweets. Are we talking maybe the same company owns Longwei and Kaiweets?
Thank you for this feedback! I would bet that Longwei does make this power supply;) I think Habotest might make the multimeters. Sometimes manufacturers will build to a spec so sometimes they are not exactly the same, but I don't know about the PS. They look the same to me, but I'd have to see the rev of the PCB.
Dr Meter and Tek Power both have linear supplies under $100.
Thank you! Those are two more low cost popular brands. I think the linear PS in this price range are 5 Amps instead of 10 Amps like this one. Is that right?
@@KissAnalog Yes , they're both 5amp, I just like the simplicity of a linear supply. Plus, when I ordered the Dr Meter supply it was lost during shipping and amazon couldn't track it, I then ordered and received the Tekpower in 24 hours, and Dr Meter showed up 2 weeks later after a refund was processed.
SURELY A BIG CAP ACROSS THE OUTPUT IS DANGEROUS TO SENSITIVE DEVICES - PLUS THERE WILL BE A BIG LAG AS YOU TURN DOWN THE OUTPUT VOLTAGE?
Vine aca por Jhonny Sintalent jajaja
LOL thanks!
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Thank you so much!
This channel Number one instrument review and learning channel on UA-cam 💞
Thank you - much appreciated!
@@KissAnalog you are always welcome 💝