Which laboratory power supply KORAD KA3005D or KORAD KD3005D?

Riden is very cool, but it's just a module. You need to power it from something, give it some kind of housing, etc. If for a start and it is to be cheap and good then only Korad.

I bought KA3005DS in botland because on hotair the price was 100 more I think it is a temporary price. I played two days so far it performs sensationally for 380zl with shipping it's a nice toy.

>>20908913 .


The prices have already changed to the current ones. For a while there was actually confusion with them old deliveries and new deliveries. The korad version of the ka3005d ka3005P will no longer be sold and will be replaced by the ka3005ps and ka3005ds versions, which have an led display of the current power consumption. the P and D versions are on sale.

Photographs of the Korad coil packs for comparison in the ka3005ps and ka3005p versions
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>>21124699 .
I wonder if they have a calibration option like the old models.

Yes, there is calibration

ZDV12 wrote:

Thanks for the 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 priced up to about 300PLN, single-channel, that has adequate protection to withstand such tests?
Short-circuit tests will usually be around up to about 20-22V ("laptop voltages").

Link

zdzichra wrote:

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

We have done many tests on Korad ka3005d power supplies nothing like this has happened. I made a quick video Link .

I have ordered the KA3005D (apparently they are going out of production) because I find the front panel more readable than the KA3005DS and I am considering buying a second one. My question is how often do you find yourself using two such power supplies at once and is it worth it? usually current limiting is required for one faulty line and the projects are powered by 5V and 12V switching power supplies. Can they be connected in parallel for 30V/10A as in series for 60V/5A? this is an extra 350£, the question is whether a second lab power supply is necessary, is it worth it, or is it better to buy/build something two-channel with voltage regulation only .

It depends on what you are doing, but in general it is best to have at least two channels/power supplies. Testing one simple board with voltage measurement of e.g. a battery already requires 2 channels. I use 2 and sometimes 3 power supplies very often.
Combining different power supplies can always be a problem if they don't have this in the specification. It happened to me to push a small current to the Korad in the other direction and it did not break. In such applications, a multi-channel power supply with a built-in option to combine channels in parallel/series is best.

slavo666 wrote:

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Combining different power supplies can always be a problem if they don't have it in the specification. I have occasionally pushed a small current into a Korad in the other direction and it did not fail. In such applications, a multi-channel power supply with a built-in option to combine the channels in parallel/serial is best.

Only such a two-channel digitally controlled one is already a considerable expense. Two Korads come out cheapest. Anyway, what can go wrong there, probably only the output transistors. For the price of such a two-channel (third unregulated) KA3305D, we have 3 KA3005D. The biggest problem is the simultaneous switching of the outputs, in series connection this can be important.

Two KA3005D also take up less space (I have a desk under the window) : https://youtu.be/WRZY9mYmFBk?si=flIQJSxu_bKPwgLd

A little comparison with the Rigol DP832 : https://youtu.be/EpIxw90Oku8?si=5ZDQ2rrE8vxR2j_Z

Have I received a fake Korad? production date 2023.
https://youtu.be/hWDy3qrTkrY?si=rGWUSqe5-tyTVhjY



EDIT: The lettering is much darker and the filters are more pink than red, while the fan is almost inaudible, maybe it's the manufacturer's changes?
Interestingly, Velleman ticks an identical one, the LABPS3005D.
Here the schematic: https://youtu.be/lbONDHU3YLk?si=wBtdm4GGdrDrjCpa

maz9 wrote:

Yes, there is a calibration

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Would you post some info regarding this if it's not a secret.
I'd also like to ask how the display refreshes? The same as in the old versions, i.e. ultra fast, or has something perhaps deteriorated in this regard?

I by calibrating according to this:
https://www.youtube.com/watch?v=RKG0rpHPzpQ&t=90s
I think I have blown the Korad 3005D
Some circuit on the front board must have died, because in the power section (transistors, diodes) everything ok.
Can't set any voltage on the output, or maybe the encoder died?
So that if something works and correctly indicates values - it is better not to combine.

slavo666 wrote:

Riden is very cool, but it's just a module. You need to power it from something, give it some sort of enclosure etc. If for a start and it has to be cheap and good, only Korad.

Recently I was putting together an RD6018, I used the PSU that is supposedly recommended by the manufacturer of these inverters: https://www.aliexpress.com/item/1005004594114....order_list.order_list_main.60.6d811c24921YD9. Unfortunately there is something wrong with this PSU or it just has to be this way, namely even at low 5V and currents up to 0.7A the fan of this PSU starts running when the interior temperature of the case reaches 44°C, then cools down the interior to 38°C and cycles again all the time. This fan howls and makes me nervous. If I had known that such circuses would occur at low currents and voltages, I would have simply bought one of the cheaper pulse lab power supplies. The Korad mentioned in this topic is a linear power supply, and these supposedly heat up more strongly than switching power supplies, so that's probably why the fan used in this power supply has to cool the inside non-stop. Maybe replacing this fan with some quiet company fan would help. There is another worthwhile PSU that has no fan at all, is passively cooled and is said to have very low noise for a switch mode PSU - the Gophert . Today I don't know what to do with this junk, whether to put it away and buy one of the cheaper PSUs I've listed here, or maybe try to replace the fan of this PSU with some company's fan. Edit: I'm attaching pictures of my PSU after removing the PSU sheet metal and moving the fan to the very end of the case it's a bit quieter going this PSU but it still has something wrong with it.

lfldp wrote:

https://www.aliexpress.com/ite...er_list_main.60.6d811c24921YD9. Unfortunately there is something wrong with this PSU or it just has to be that way, namely even(...)

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And have you perhaps tried to read the offer description? It is even in Polish.

slavo666 wrote:

lfldp wrote:

https://www.aliexpress.com/ite...er_list_main.60.6d811c24921YD9. Unfortunately there is something wrong with this PSU or it just has to be that way, namely even(...)

.
And have you perhaps tried to read the offer description? It's in Polish even.

Nothing comes out of this description, it's all about quite fast heating, which makes the fan run even at low currents. Perhaps other PSUs work better, but this one is one of the more expensive ones that the manufacturer itself recommends. Here described a similar problem, in that case even better, because the fan only turns on at 50C https://www.elektroda.pl/rtvforum/topic3886034.html#19973865 .