Products > Test Equipment
Inside the new Korad KA3305P linear PSU
Pinkus:
you may ask them to send you a new main board with a new software release installed instead. This would be the least expensive way for everybody.
torch:
--- Quote from: Hydrawerk on September 19, 2015, 03:32:52 pm ---Just paste the youtube link.
--- End quote ---
I don't do youtube anymore. I closed down my account when Google tried to force me into signing up for a bunch of stuff I didn't want. The video is hosted by me. But thanks for the thought.
torch:
--- Quote from: Pinkus on September 19, 2015, 03:40:27 pm ---you may ask them to send you a new main board with a new software release installed instead. This would be the least expensive way for everybody.
--- End quote ---
I'll ask.
torch:
I asked, and was surprised to receive a reply on a Sunday. Sounds like they are willing to do a board swap. The guy who is handling this is on vacation this week, but they will have him contact me to hammer out the details when he gets back next week.
I have to say that Korad (and their distributor) seem to be standing behind the product.
I also asked about the maximum output rating. Their response was
"It depends on the fan and heatsink inside the unit. As long as that fan keeps going you could theoretically run all three channels at max indefinitely, but the fan is the weak point. "
This would seem to confirm Klienstein's earlier comment:
--- Quote from: Kleinstein on September 08, 2015, 09:00:08 am ---The real drawbacks of these cheap chinese PSUs is the thermal design: they are made to deliver much power at low cost. Here less safty marging saves costs and thus things get hot right to the limit.
--- End quote ---
mos6502:
--- Quote from: torch on September 20, 2015, 06:04:07 pm ---I also asked about the maximum output rating. Their response was
"It depends on the fan and heatsink inside the unit. As long as that fan keeps going you could theoretically run all three channels at max indefinitely, but the fan is the weak point. "
--- End quote ---
Hmm. Usually the weak point is the transformer. Because copper is expensive. So if manufacturers want to skimp, they just use a smaller transformer and rely on airflow to keep it cool.
Another trick is to use a very small filter cap and higher transformer output voltage and rely on the pass element to dissipate the extra heat. The small filter cap keeps the RMS current low and allows the transfomer to deliver more power. This is also why you should never "upgrade" the filter caps in a linear supply with larger ones.
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