Which laboratory power supply KORAD KA3005D or KORAD KD3005D?

Hello,

I have been thinking about buying a power supply for a long time - after quite intensive browsing of forums and stores, the choice fell on Korad power supplies, I need 30V and 5A, the power supply will be used to power mini projects on prototype boards, devices that are sometimes overridden (laptops, RFID readers) and it would be good to be suitable for short-circuit tests, which I have not had the opportunity to do yet. Hence my question, which model is better to choose KORAD KA3005D or KORAD KD3005D?

https://hotair.pl/pl/sklep/zasilacze-laborato...a3005d-30v-5a-pamiec-5-profili-zasilania.html

https://hotair.pl/pl/sklep/zasilacze-laborato...ilacz-laboratoryjny-korad-kd3005d-30v-5a.html

Seemingly the same, from my point of view the more expensive one has the ability to remember up to 5 power profiles - I don't see the point in using this (unless I'm wrong and something like this may have a sense other than convenience).
The second thing, the cheaper KORAD KD3005D is based on a transformer - the second one does not have this information - I understand that the solution is different (impulse?), Does it matter to me? (I would like to remind you that it is to be used for short-circuit tests, and to supply systems with different amperage and voltage).

Thank you in advance for your help.

Both are built based on a transformer ... and power profiles are whatever you prefer ... convenience

With short-circuit testing, none of these power supplies are 100% short-circuit proof, despite the vendor's claims. If you do a full short at 30 volts, it may turn out to be the last short before the final transistors die I'm not saying this will happen the first time, but the next time for sure. I have repaired over a dozen, if not dozens, of such rugged power supplies

Thank you for valuable information.

Now, referring to the fact that these power supplies are not very suitable for short-circuit tests - is there a 30V 5A power supply at a price of up to about PLN 300, single-channel, which has adequate protection to withstand such tests?
Short-circuit tests will usually be around 20-22V ("laptop voltage").

I'll hook up. And do you know any power supply that will fully withstand a short circuit at max settings? single-channel or two (here, short circuit in, say, serial and parallel operation). I have a choice myself. Rather digital I give up because of the micro processors.

And how is the warranty for damage during a short circuit because since the short-circuit protection is probably it should oblige.

zdzisiek1979 wrote:

And do you know any power supply that will fully withstand a short circuit at max settings?

Every day I work with a power supply that can withstand my settings, i.e. 4.2V and 2A and every day comes to a full short circuit. Rigol and Siglent do the trick, Korad can take it too.
Unless you mean something else?

ZDV12 wrote:

Seemingly the same, from my point of view the more expensive one has the ability to remember up to 5 power profiles - I don't see the point in using this (unless I'm wrong and something like this may have a sense other than convenience).

Profiles / memories are a terribly convenient solution, personally I can no longer see the possibility of everyday work without this convenience, especially when you run different devices that require different voltages and currents.

zdzisiek1979 wrote:

I'll hook up. And do you know any power supply that will fully withstand a short circuit at max settings? single-channel or two (here, short circuit in, say, serial and parallel operation). I have a choice myself. Rather digital I give up because of the micro processors.

And how is the warranty for damage during a short circuit because since the short-circuit protection is probably it should oblige.

Sure I know. I have one like the following and you can both short-circuit for any length of time for max current and max voltage. The heat sinks only heat up a bit.
They can be bought from national NDN distributors, but in NDN I am no longer called MCP but NDN (if I remember correctly), but the power supply is the same.

I saw this matrix in tme and I was interested in 5A. Twintex yet. Probably almost the same brandy as.
I do not know if this matrix has ordinary or many rotary potentiometers because in the movie I saw that V has many rotary switches. Either modification or original.

It is not about the fact that the power supply will not withstand the work with a long short circuit because it can withstand practically everyone who has written that they have short-circuit protection. 20 And he has not yet died but instead of transistors like 2n3055 or similar I have some BUX that I can't kill

zdzisiek1979 wrote:

I saw this matrix in tme and I was interested in 5A. Twintex yet. Probably almost the same brandy as.
I do not know if this matrix has ordinary or many rotary potentiometers because in the movie I saw that V has many rotary switches. Either modification or original.

In my Matrix V is ten-turn while A is normal.
In MCP both are usually, but very precise, working with resistance, which allows for accurate parameter setting.

pzdr

You brightened my situation - thank you for all the tips and your experiences, when I decide on something - I will let you know.

Maybe there is a problem with these 2N3055 because the mass of fakes on the market.
It may be worth replacing on which KD502 or the former recovered 2N3055.

This is what interested me whether the precise 10-turn is originally.

Now I won't buy anymore because the printer has gone down and what has just gone for a new one. Qlxxxxxx have.

Hello. I have KA3005D for several years (newer version - see EEVBlog), I often charge Li-ion cells and other batteries with it. When repairing equipment, I never had a problem with it, whether it was a short circuit or a set current. With a clear conscience I recommend. Adam

I have been using the older version of KA3005D for 5 years and I am very pleased.
Settings memories are very convenient, the most commonly used settings are remembered and only modified as needed. The current regulation works very well. I think there was info on the EVBlog that when the power supply is turned on (main switch), the peak of maximum voltage appears and it is better not to turn it on with the device connected. In fact it is so, but the impulse is very short (I measured but I don't remember time - if you want I can check it tomorrow and upload the oscillogram). I haven't burned anything yet.
I use to run prototypes, sometimes charging lipols, phone, recently even made a drone battery charger
In general, I recommend, although more and more often thinking about replacing with a 3 channel model mainly due to parallel work and higher amperage.

I will step in with the question to those possessing KA3005D. How loudly does the fan work in this power supply without load and say under long-term load say 200mA and 12V?
Will not be a nuisance in the long run.

Whether it is loud will always be a subjective feeling.
It is certainly less audible than a vacuum cleaner called the Rigol oscilloscope
It is quiet on my ear, it works for me at such loads and must be really quiet in the room to hear it.

el.amator wrote:

Will not be a nuisance in the long run.

It will be better than with Rigola power supplies ...

Thank you for the information. Since it can withstand the Rigola oscilloscope, maybe it won't be that bad.
On the other hand, several such devices with fans running at once will already be quite a noise.

For those interested in pics. Some changed in Korad power supplies. The fan is quieter than in previous versions. With this, please remember that in previous versions the sound of the working fan would set after connecting the current receiver or load. Noise only if the power supply was not loaded. Keep in mind that, however, in most cases the equipment that we turn on is used, and we connect something under it and then the noise disappears.

Anyway, now Korad power supplies are quieter. They become even more silent if we connect a power receiver. The most important thing is that they can be set in the operating mode as a current source and the set current values are shown on the display. Within the price limits of the Korad KD3005D power supply, it is a unique advantage and a useful function.

Good morning everyone. Great photos, thanks to the author!

Can you measure this gold coil R2 over the diode, what is its resistance value?

Hey, I can't find anywhere on the net (even on the manufacturer's website) more information about this power supply - Korad KKG305D 0-30V 0-5A. Everywhere well known and described KA3005D or KD3005D. Korad KKG305D has similar parameters according to the botland store and costs less than KA3005D. Is this something new or what?

Edit: I bought this Korad KKG305D power supply, it looks good. Will test it in amateur use.

life27 wrote:

Edit: I bought this Korad KKG305D power supply, it looks good. Will test it in amateur use.

Did you manage to check this power supply? Does it pass the diode test? And how is the ripple in it? Is it similar to the KA3005D/P? I'm just thinking about it, but as you write, there is no information about it on the manufacturer's website, and there are also zero sensible reviews on the web.
I don't know whether to take a risk or, however, to buy the KA3005D and not combine.

Test of the diode passes, I checked. As for the ripple, I have no way to check.

.

OK thank you for your answer. I am surprised that there is no information about it on the manufacturer's official website.

There is also KORAD KA3005DS, a supposedly improved version. Do you know anything that has been improved?
https://www.hotair.pl/pl/sklep/zasilacze-labo...3005ds-30v-5a-pamiec-5-profili-zasilania.html

Power measurement, higher ammeter resolution for small currents (0.1mA).

Do you perhaps know why the older version is more expensive than the new one if the new one is improved?

CORAD KA3005D:
https://www.hotair.pl/pl/sklep/zasilacze-labo...a3005d-30v-5a-pamiec-5-profili-zasilania.html

CORAD KA3005DS:
https://www.hotair.pl/pl/sklep/zasilacze-labo...3005ds-30v-5a-pamiec-5-profili-zasilania.html

At one time the price of the old Korads jumped to about 500zł. Either the stock was running out or the popularity increased (in which I think I also had some share).
If I were to buy now it would be the new one while it is not popular.

As for important corrections I know of one particular one after a video on EEVblog, where the power supply gave full voltage at the output and it was 11 years ago.
I plan to buy it and do tests, but that's in a while.

slavo666 wrote:

Once upon a time, the price of the old Korads jumped to about 500zl. Either the stock was running out or the popularity increased (which I think I also had some part in).
If I were to buy now it would be the new one while it is not popular.

As for important fixes, I know of one particular one after a video on EEVblog where the power supply gave full voltage at the output, and that was 11 years ago.
I plan to buy it and do tests, but that's some time away.

And you personally, what would you choose, KORAD KA3005DS or Riden RD6006?