Products > Test Equipment
Why so expensive? BK Precision 1743B Power Supply
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BeBuLamar:
In this case I think BK just want to charge too much. The unit doesn't look better than the other units and has a lot less features.
Mechatrommer:

--- Quote from: 2N3055 on December 27, 2022, 11:02:40 am ---
--- Quote from: AVGresponding on December 27, 2022, 10:31:49 am ---Is it particularly heavy? Hopefully, the physical size indicates it's a linear PSU, with a big-ass transformer. The Korad is a switcher. Linear PSUs are always more expensive watt for watt as they are less noisy on the outputs.

--- End quote ---
KORAD KA3005P is not a switcher..

--- End quote ---
looks like it is... at least there must be smps pre-regulator in there... hinted by the lack of hefty heatsink usually seen on purely linear PSU... but the Korad's regulation <2mVrms (similar to BK) also hinted they've done some homework. the BK's look bigger from the outside but we cant be sure without teardown, probably pure linear, probably with smps pre-reg as well, noise floor for both is about same 1mVrms..



i cant find teardown for 1743, if it has the kind of heatsink and toroidal like in this video, then the higher price is justifiable, ymmv.


BeBuLamar:
I don't know about the Korad but I bought this one April 2021 for $129. Amazon wants $199 for it now. But it's linear, has digital readout and counting wheel as well as an RS-232.
https://www.amazon.com/Programmable-Single-Channel-Supply-MPS-3605LP-MATRIX/dp/B07Y86LBRY
tooki:

--- Quote from: Mechatrommer on December 27, 2022, 02:40:23 pm ---
--- Quote from: 2N3055 on December 27, 2022, 11:02:40 am ---
--- Quote from: AVGresponding on December 27, 2022, 10:31:49 am ---Is it particularly heavy? Hopefully, the physical size indicates it's a linear PSU, with a big-ass transformer. The Korad is a switcher. Linear PSUs are always more expensive watt for watt as they are less noisy on the outputs.

--- End quote ---
KORAD KA3005P is not a switcher..

--- End quote ---
looks like it is... at least there must be smps pre-regulator in there... hinted by the lack of hefty heatsink usually seen on purely linear PSU... but the Korad's regulation <2mVrms (similar to BK) also hinted they've done some homework. the BK's look bigger from the outside but we cant be sure without teardown, probably pure linear, probably with smps pre-reg as well, noise floor for both is about same 1mVrms..

--- End quote ---
Nope, the KA3005P is purely linear. Just uses a fan across the heatsink, which is largely obscured, to keep cool under load. (Heatsink design has changed over the years.)
AVGresponding:

--- Quote from: tooki on December 27, 2022, 06:15:47 pm ---
--- Quote from: Mechatrommer on December 27, 2022, 02:40:23 pm ---
--- Quote from: 2N3055 on December 27, 2022, 11:02:40 am ---
--- Quote from: AVGresponding on December 27, 2022, 10:31:49 am ---Is it particularly heavy? Hopefully, the physical size indicates it's a linear PSU, with a big-ass transformer. The Korad is a switcher. Linear PSUs are always more expensive watt for watt as they are less noisy on the outputs.

--- End quote ---
KORAD KA3005P is not a switcher..

--- End quote ---
looks like it is... at least there must be smps pre-regulator in there... hinted by the lack of hefty heatsink usually seen on purely linear PSU... but the Korad's regulation <2mVrms (similar to BK) also hinted they've done some homework. the BK's look bigger from the outside but we cant be sure without teardown, probably pure linear, probably with smps pre-reg as well, noise floor for both is about same 1mVrms..

--- End quote ---
Nope, the KA3005P is purely linear. Just uses a fan across the heatsink, which is largely obscured, to keep cool under load. (Heatsink design has changed over the years.)

--- End quote ---

It's a puny looking transformer for something that can allegedly output 150W. Also the description in the Amazon link is wrong, as it claims 1mV resolution with a 4-digit readout. Good luck with anything over 9.999V!

It'll be interesting too see inside the BK for comparison. My guess is it'll be beefier, and by implication, more likely to meet claimed specs and be reliable.
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