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Dual regulators for single rail?
Dual regulators for single rail?
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Old 6th February 2008, 01:58 AM   #1
leadbelly is offline leadbelly  Canada
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Dual regulators for single rail?
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
leadbelly is offline leadbelly  Canada
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Dual regulators for single rail?
Anybody? Bueller? Bueller?
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Old 8th February 2008, 03:31 PM   #3
leadbelly is offline leadbelly  Canada
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Dual regulators for single rail?
Seriously, nobody has a comment or opinion?
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Old 8th February 2008, 03:47 PM   #4
richie00boy is offline richie00boy  United Kingdom
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Dual regulators for single rail?
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
EWorkshop1708 is offline EWorkshop1708  United States
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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
leadbelly is offline leadbelly  Canada
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Dual regulators for single rail?
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
richie00boy is offline richie00boy  United Kingdom
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Dual regulators for single rail?
Forget using 78xx or 79xx regs then. Check out the low noise applications on the LM317 datasheet.
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