EEVblog, I found the answer to one thing you mentioned in the original review of this power supply. To get to memory 5, or M5 press M4 and turn the rotary encoder. Funny how they did this!
Nice follow up. Still a cheap power supply, but at least you do know that the design is good, and that the manufacturer does stand behind the product and is willing to do any changes to improve the reliability of it. Makes for a good relationship, and a good plus for both Korad and Charles for being so open about the issue and for resolving it. Like the respin on the power board, now the semis are not stressed by soldering and assembly. Nice looking upgrade, and good work. Love the flip flops..
Hi, what about the big brother of it, the Korad KA3305D or P? Could you make a review of that too? I'm looking for something like that additionally, because one PSU with only one Voltage at a lab is just not enough. I like your reviews very much, you're my reference when it comes to electronics videos - few are at least equal. Just stick to it, you're the best!
For me, its very rewarding to build things. Don't be disheartened about the lack of gear. Youll get it slowly over time. I started tinkering with an analog meter (MAVO35), a shitty soldering gun, recovered parts, plenty of wires and a homemade 12v max 500mA psu built and gifted to me by a HAM who happened to live in the same apartment building. If you feel joy building, Id say ,do it, even with less then ideal equipment. Build up from what you have.
Things have moved on yet again with this power supply. The heat sink is a rather fancy extruded one with a separate area for the bridge rectifier. My only concern is the transformer has a 230 V label on it. My mains is around 245 V but I won't be hammering it. Nearly everything we get has the EU 230 V label but so far nothing has popped - yet.
Dave, I went to your Amazon store to look for the Korad but it wasn't there. Also surprised you don't have the Anatek blue ESR meter listed since I just bought my kit a few weeks ago through Amazon. An essential piece of test equipment, IMO. Well, Happy New Year since you Aussies are a day ahead of the rest of the world.
Hi, seems there is just another version with a slightly different board layout which just broke down on me. Purchased January 2014 in Germany, display showing 12.00V output is nine-ish with a couple of meters of led stripe drawing 1.5A and disabled protection / constant voltage mode. Andi
Korad ka3003p has better output specs than ka3005p, 1mv vs 2mv, 3ma vs 5ma, in output fluctuating, according to the specifications. Dave, could you verify this? You can do a comparison video with others, that will be interesting.
all is relative as to in regards to what pricelevel-psu you comåpare to,, but as a 80US budget 150w liniar psu, it seems to perform pretty damn solid.. there is a lot of users responses as in regards to reltive little spiking in this EEVthread, but there seems to be multiple batches and also newer then this where there is 3 caps on that board, where there is 1 in the video...(check here) www.eevblog.com/forum/blog/eevblog-315-korad-ka3005p-reviewfail/300/
I made my psu with a desktop atx power supply, nice case and current and voltage display. Ok its not as good as proper ones but is cost next to nothing.
Is this new or old model?? have in mind its the 220v 30v3A version. i.imgur.com/ZEBACxm.mp4 the shunt does look like a new revision and numerous other parts look like an even newer revision. imgur.com/gallery/B7ZOQ3J
The downside it's that is not load regulated and has shitloads of noise. Anyway, for anyone who desires a high performance "low" cost PSU, google "chemelec super power supply". Understand the schematic (it's a discrete version of the obsolete MC1466L) and replace functional blocks with op-amps and drive jfets / mosfets at output. Your requirements may vary, but look into: OPA445, OPA452, OPA551(not most cheap) , AD549(expensive) , an AD or LT voltage reference.
You can get shitloads for 100 USD, if you know how to choose the parts. Certainly much more than any low cost PSU. if you ask me they do not worth the money. Don't let yourself blinded by voltage displays with PICs and LED sgments, its not what it counts in a lab PSU. And for what it worts, if you want it fast, just use 2 LT 3083 and , fixed steps for current compliance and a 10 turn pot for voltage. Still beats the shit out of any low cost PSU.
I'll be honest dave, when I first subbed to your channel I nearly unsubbed because of your voice. Not only do I not find it annoying it's actually kind of unique and cool now!
My Korad had the same issue with the new board. I'm done with this Chinese junk. From now on, on keep on saving money to buy Rohde & Schwartz or similar high end equipment. Granted you can buy a complete lab with Owon or Siglent stuff for the price of just a Rohde & Schwartz power supply, but at least you don't have to worry about the equipment failing or, even worse, destroying anything hooked up to it. Chinese just can't designing anything decent.
added! you can always just buy through the search or link on my blog site and I still get the commision.
EEVblog, I found the answer to one thing you mentioned in the original review of this power supply. To get to memory 5, or M5 press M4 and turn the rotary encoder. Funny how they did this!
Thank you for this!!!
Thanks. My voice is what it is!
You can tell Dave is a real engineer because he is wearing sandals.
Nice follow up. Still a cheap power supply, but at least you do know that the design is good, and that the manufacturer does stand behind the product and is willing to do any changes to improve the reliability of it. Makes for a good relationship, and a good plus for both Korad and Charles for being so open about the issue and for resolving it. Like the respin on the power board, now the semis are not stressed by soldering and assembly. Nice looking upgrade, and good work. Love the flip flops..
10 years later and this power supply is still being marketed.
These days, what would be the best option? Two of these or one Siglent SPD3303C?
Hi, what about the big brother of it, the Korad KA3305D or P? Could you make a review of that too? I'm looking for something like that additionally, because one PSU with only one Voltage at a lab is just not enough.
I like your reviews very much, you're my reference when it comes to electronics videos - few are at least equal.
Just stick to it, you're the best!
Dunno, but at 1:54 it looks like the bridge rectifier isn't actually touching the heatsink :P
I just bought one from amazon and it DID come with the new parts inside.
For me, its very rewarding to build things. Don't be disheartened about the lack of gear. Youll get it slowly over time. I started tinkering with an analog meter (MAVO35), a shitty soldering gun, recovered parts, plenty of wires and a homemade 12v max 500mA psu built and gifted to me by a HAM who happened to live in the same apartment building. If you feel joy building, Id say ,do it, even with less then ideal equipment. Build up from what you have.
Things have moved on yet again with this power supply. The heat sink is a rather fancy extruded one with a separate area for the bridge rectifier. My only concern is the transformer has a 230 V label on it. My mains is around 245 V but I won't be hammering it. Nearly everything we get has the EU 230 V label but so far nothing has popped - yet.
Dave, I went to your Amazon store to look for the Korad but it wasn't there. Also surprised you don't have the Anatek blue ESR meter listed since I just bought my kit a few weeks ago through Amazon. An essential piece of test equipment, IMO. Well, Happy New Year since you Aussies are a day ahead of the rest of the world.
Sorry, no idea. You'll have to ask the seller.
I dont know about dave but i bought one and it is yet to fail me! Looks like a big improvement if you ask me...
it was published a little late for Christmas...
Good idea!
Hi,
seems there is just another version with a slightly different board layout which just broke down on me. Purchased January 2014 in Germany, display showing 12.00V output is nine-ish with a couple of meters of led stripe drawing 1.5A and disabled protection / constant voltage mode.
Andi
+Horst Kotte could as well be 2 Ohms between PSU and voltmeter!
1:59 Rectifier has a big gap - not screwed down tightly. Ergh.
Korad ka3003p has better output specs than ka3005p, 1mv vs 2mv, 3ma vs 5ma, in output fluctuating, according to the specifications. Dave, could you verify this? You can do a comparison video with others, that will be interesting.
charity wise., Do ebay and paypal still take (10+10) percent and listing cost too? if they do , what about ebid? or some other site?
Where can buy interface board sapratly
Hi Dave,
What about the power supply failure video, do you still recommend it?
Eevblog not found.
8 Bits I was looking for this comment
just went to look at the price on your store and the eevblog site is gone !
So the units from your amazon store, are all the new version?
I realize it's a bit late to ask.. but did the overshoot problem go away as well?
all is relative as to in regards to what pricelevel-psu you comåpare to,, but as a 80US budget 150w liniar psu, it seems to perform pretty damn solid..
there is a lot of users responses as in regards to reltive little spiking in this EEVthread, but there seems to be multiple batches and also newer then this where there is 3 caps on that board, where there is 1 in the video...(check here)
www.eevblog.com/forum/blog/eevblog-315-korad-ka3005p-reviewfail/300/
I made my psu with a desktop atx power supply, nice case and current and voltage display. Ok its not as good as proper ones but is cost next to nothing.
I may need to watch this video 10 times to get my usual EEVblog fix. :-)
Can you buy the whole machine?
for 100USD you can buy 3 precision opamps , a good transformer, several mosfets and roll a PSU which would outperform the advertised one 10:1.
That's what happens when you are forced to do that at someone else's place!
How much they paid you to change the story form "junk" to recommend?
that heatsink is funny...
i dont even know what kind of stuff is in his videos all the time. but i still watch them. dont know why. i have no knowledge in this kind of topic
sorry what is this? where is this power supply used lol?
can i get 2 of them
?
Does this KORAD/TENMA/VELLEMAN PSU comply with any safety class (61010-1) and EMC (55011) directives ?
woah- a quick EEVBlog that actually IS quick! What is the world coming to?
All kidding aside, love the blog Dave- and a very good video.
So when are you going to blow up this model? Perhaps you can succeed where others have failed? :)
#404.. Ups.. video not found..
Is this new or old model??
have in mind its the 220v 30v3A version. i.imgur.com/ZEBACxm.mp4
the shunt does look like a new revision and numerous other parts look like an even newer revision.
imgur.com/gallery/B7ZOQ3J
I'd probably buy it, but I could bet its all too late now...
The downside it's that is not load regulated and has shitloads of noise. Anyway, for anyone who desires a high performance "low" cost PSU, google "chemelec super power supply". Understand the schematic (it's a discrete version of the obsolete MC1466L) and replace functional blocks with op-amps and drive jfets / mosfets at output. Your requirements may vary, but look into:
OPA445, OPA452, OPA551(not most cheap) , AD549(expensive) , an AD or LT voltage reference.
You can get shitloads for 100 USD, if you know how to choose the parts. Certainly much more than any low cost PSU. if you ask me they do not worth the money. Don't let yourself blinded by voltage displays with PICs and LED sgments, its not what it counts in a lab PSU. And for what it worts, if you want it fast, just use 2 LT 3083 and , fixed steps for current compliance and a 10 turn pot for voltage. Still beats the shit out of any low cost PSU.
I don't get it. You just sound Australian to me. Why do people keep pointing out your accent. You're perfectly legible.
yea!!!!!
Your voice is just normal, what ya talkin 'bout?? :P
I WILL TAKE THEM
What about the transformers!!!
I'm the same
Did Santa take your waffle-o-meter away for being a bad boy, Dave? Haha, just kidding. Have a prosperous and safe New Year.
But I did it :P Try it, you will be pleasantly surprised :P
I'll be honest dave, when I first subbed to your channel I nearly unsubbed because of your voice. Not only do I not find it annoying it's actually kind of unique and cool now!
My Korad had the same issue with the new board. I'm done with this Chinese junk. From now on, on keep on saving money to buy Rohde & Schwartz or similar high end equipment. Granted you can buy a complete lab with Owon or Siglent stuff for the price of just a Rohde & Schwartz power supply, but at least you don't have to worry about the equipment failing or, even worse, destroying anything hooked up to it.
Chinese just can't designing anything decent.