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In Reply to: Thanks,that cleared it up for me! posted by Rune on April 30, 2007 at 01:29:30:
You can only have one or the other. You could have a current LIMITED voltage regulator, but it's still voltage regulated. If your current output (which will vary in a VR supply) goes too high past a design spec, the output will drop, effectively limiting the current output.The Karna design uses shunt voltage regulation for the B+ driver stages, but does not regulate the filaments. It basically is a voltage supply, with regulation determined by the 120VAC of your house power. If your house power drops to 115V, all filament supplies will drop by the same percentage. So while it IS a voltage supply, it is not specifically regulated.
Technically, it has pretty good load regulation, but no line regulation. That is, as the load varies, the voltage will be fairly constant. As the line (house power) varies, the voltage will change.
FWIW, I am currently building a Raven preamp, and am debating between an Amity or Karna design. I can say this much, as a licensed PE with good knowledge in both power and electronic theory, the Karna is a VERY daunting design. It may look easy and simple on paper, but the actual build and attention to subtle grounding is critical. If you are having some of the questions you are posing, I would kindly and respectfully steer you away from building it. At a minimum, try a "tiny" Raven design first, to see how successful you are.
Just my two cents.
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Follow Ups
- Yes, voltage regulated - KurtP 09:49:05 04/30/07 (1)
- Thanks - Rune 02:47:15 05/01/07 (0)
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