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Old 6th February 2008, 01:58 AM   #1
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Default Dual regulators for single rail?

Any comments on the attached schematic? It seems to me that this design would better reject common mode noise in the AC, but I don't know enough to be sure. I don't remember ever seeing such a scheme shown in a schematic, but I don't know if that means it's pointless or if that as parts count go up, a designer will forgo a 3 terminal regulator in favour of discrete components.
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Old 7th February 2008, 02:17 AM   #2
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Anybody? Bueller? Bueller?
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Old 8th February 2008, 03:31 PM   #3
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Seriously, nobody has a comment or opinion?
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Old 8th February 2008, 03:47 PM   #4
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I think there's no need, the transformer galvanic isolation provides the rejection of common-mode noise from the mains. All you are doing there is doubling the supply impedance and creating twice as much heat, real estate and cost.
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Old 9th February 2008, 12:47 AM   #5
tINY is offline tINY  United States
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Common mode noise should be pretty much eliminated by the transformer. For non-CM noise, I don't believe this circuit buys you anything either.

Is there some issue you are trying to solve here?




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Old 10th February 2008, 09:17 PM   #6
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It's a split power supply without using the middle rail as ground.

Maybe it can be used to get a higher voltage with lower voltage regulators?
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Old 10th February 2008, 09:22 PM   #7
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Quote:
Originally posted by tINY

Is there some issue you are trying to solve here?
Not an issue, no. I am planning to build a phono preamp with poor PSRR and want the best performance regulator I can get without going to a discrete design.
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Old 10th February 2008, 09:28 PM   #8
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Forget using 78xx or 79xx regs then. Check out the low noise applications on the LM317 datasheet.
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