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In Reply to: RE: Noise is bad-LT1083 100VA posted by Ryelands on September 14, 2014 at 15:25:42
I would have not said anything to someone who doesn't pay thousands for a cable and other gadgets and yet not seek the best for a power supply.
A superregulator powered by an ultra isolation transformer will have much better bandwidth and isolation.
This business of R Core can be an old wife's tale. I know for a fact that some China sourced R cores are iffy to say the least. I'd much rather go for a high quality anything.
Follow Ups:
I almost forgot to include this:
"A "superregulator" only gives good noise rejection through the bandwidth of the control opamp. That isn't really very high in frequency in the overall scheme of things relative to computers. Any knowledgeable engineer knows this. Or, ask Walt Jung. You need passive filtering to complement whatever regulator you use. That's not an indictment of these regulators - what they do, they do very well for their intended purpose. BTW, their intended purpose is only partly to give noise rejection - the designers of these regulators usually are just as concerned with flat, low terminal impedance across the audio band. Maybe more."
This information came second hand to me. Lucy gave it to me after discussing the issue with a Doberman who lives on our street.
I suggest that do some research and compare them with your LT1063 spec sheet in terms of bandwidth, output noise, regulation, output impedance etc.
Mine comfortably does 5 uV noise wideband to 1 MHz +, beyond which I did not have the instrument to measure properly.
Second hand info needs to be scrutinised on the basis of context and accuracy.
My 2A 12V units cost me no more than $50 to make and I can churn them off repeatably.
I need a minimum of 4A for the GRAID drives.
But Steve,
You can always use an isolation transformer (proper one). ;-)
I wonder what brand and model would constitute a "proper one" for YOUR APPLICATION. It's easy to be vague.
A superregulator powered by an ultra isolation transformer will have much better bandwidth and isolation.
But it won't power your disk drives because the designs I've seen won't supply the necessary current. Besides, these 'superregulators' are designed for audio circuits, not for supplying the current demands of HDD motors.
Your HDPlex power supply is very well suited for YOUR APPLICATION, which some folks here can't seem to grasp.
Abe,
Fred's design puts out 2A. I need 4A. You obviously know what you are talking about.
Which specific 'superregulator' design (by whom) and what version is Fred suggesting? There are several out there that claim to be 'superregulators'.
Is there an online schematic of the specific design he is talking about?
not a problem, just uprate the power transistor.
But this was not my point. My point was that the LT 108x based PSs are at best slow and mediocre, with limited bandwidth, and that 2nd hand opinion needs to be processed and not just repeated in a discussion of any value.
I am sure that you must be aware of much better PSs if you visit Computeraudiophile.com
I have no doubt I could purchase far more expensive power supplies. Would there be beneficial sonic results? I really don't know. But I do have something coming that might shed some light on this.I do know that the HDPlex sounds better than the SMPS. But then again Fred, I NEVER stated that this was a state-of-the art solution.
Edits: 09/15/14
you have just said was what I set out to say. Really there was no need for this prolonged and defensive exchange.
.
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