Electronics > Repair
Korad KA3005P power supply faulty/repair
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pomonabill221:
Yes, they could have controlled the latch's output enable pin rather than just enable it all the time...
I will keep updates coming as I find out more about the turn on overshoot... I still believe it is due to an op amp sitting at it's rail when off, and the recovery time when turned on, as these overshoots aren't present when changing voltage while the supply is on.

I really hope the schematics help others, and others share what they find as well.  I like my supply and want to improve on a few things.

It ain't an HP/Agilent, but it didn't cost like on either!
AllanMN:
@pomonabill221 Yes, thanks indeed. I ordered one.
pomonabill221:
Now I just need to find out why the software doesn't work on win7 64 bit.
It will start and kind of controls the supply but keep complaining about labview which I do not have.
Why does it need labview and where do I get it (free)?
also, I cannot change the path in the box where it is indicating d:\koradka3005p save data... I don't have a D drive (well I do but it is a cd drive).
VERY strange!
commongrounder:
@pomonabill221:  I have the D version (non-USB/serial) of the power supply, so I can't check this for you, but I do know that some interface software uses the National Instruments drivers to talk to hardware.  My Rigol scope would not communicate properly with the capture software until I installed the driver specific to that model.  There is a Third Party driver repository on the NI web site.  I don't believe you need to install the Labview software itself (many $$$$).  The problem with the default save directory sounds like lousy software coding to me....
Hopefully, someone else using Win7 64bit can relate their experience with the Korad software/hardware.
pomonabill221:
I know what you mean about the Rigol and the NI drivers... I went through that and got the Rigol to talk just fine.
The Korad is a different story and is frustrating to use, AND is pretty lousy as well.
I just wanted to try the new version, and it sucks! (just like others have found).
The graphics are pretty, but also pretty useless!
Thanks though....
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